TS Lua Plugin

This module embeds Lua, via the standard Lua 5.1 interpreter, into Apache Traffic Server™. With this module, we can implement ATS plugin by writing Lua script instead of C code. Lua code executed using this module can be 100% non-blocking because the powerful Lua coroutines have been integrated into the ATS event model.

Synopsis

test_hdr.lua

function send_response()
    ts.client_response.header['Rhost'] = ts.ctx['rhost']
    return 0
end

function do_remap()
    local req_host = ts.client_request.header.Host
    ts.ctx['rhost'] = string.reverse(req_host)
    ts.hook(TS_LUA_HOOK_SEND_RESPONSE_HDR, send_response)
    return 0
end

sethost.lua

local HOSTNAME = ''
function __init__(argtb)
    if (#argtb) < 1 then
        print(argtb[0], 'hostname parameter required!!')
        return -1
    end
    HOSTNAME = argtb[1]
end

function do_remap()
    ts.client_request.header['Host'] = HOSTNAME
    return 0
end

Installation

This plugin is only built if the configure option

--enable-experimental-plugins

is given at build time.

Configuration

This module acts as remap plugin of Traffic Server, so we should realize ‘do_remap’ or ‘do_os_response’ function in each lua script. We can write this in remap.config:

map http://a.tbcdn.cn/ http://inner.tbcdn.cn/ @plugin=/XXX/tslua.so @pparam=/XXX/test_hdr.lua

Sometimes we want to receive parameters and process them in the script, we should realize ‘__init__’ function in the lua script, and we can write this in remap.config:

map http://a.x.cn/ http://b.x.cn/ @plugin=/X/tslua.so @pparam=/X/sethost.lua @pparam=a.st.cn

This module can also act as a global plugin of Traffic Server. In this case we should provide one of these functions in each lua script:

  • ‘do_global_txn_start’
  • ‘do_global_txn_close’
  • ‘do_global_os_dns’
  • ‘do_global_pre_remap’
  • ‘do_global_post_remap’
  • ‘do_global_read_request’
  • ‘do_global_send_request’
  • ‘do_global_read_response’
  • ‘do_global_send_response’
  • ‘do_global_cache_lookup_complete’
  • ‘do_global_read_cache’

We can write this in plugin.config:

tslua.so /etc/trafficserver/script/test_global_hdr.lua

We can also define the number of Lua states to be used for the plugin. If it is used as global plugin, we can write the following in plugin.config

tslua.so --states=64 /etc/trafficserver/script/test_global_hdr.lua

If it is used as remap plugin, we can write the following in remap.config to define the number of Lua states

map http://a.tbcdn.cn/ http://inner.tbcdn.cn/ @plugin=/XXX/tslua.so @pparam=--states=64 @pparam=/XXX/test_hdr.lua

TS API for Lua

Introduction

The API is exposed to Lua in the form of one standard packages ts. This package is in the default global scope and is always available within lua script. This package can be introduced into Lua like this:

ts.say('Hello World')
ts.sleep(10)

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ts.process.uuid

syntax: val = ts.process.uuid()

context: global

description: This function returns the global process id.

Here is an example:

local pid = ts.process.uuid()  -- a436bae6-082c-4805-86af-78a5916c4a91

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ts.now

syntax: val = ts.now()

context: global

description: This function returns the time since the Epoch (00:00:00 UTC, January 1, 1970), measured in seconds. It includes milliseconds as the decimal part.

Here is an example:

local nt = ts.now()  -- 1395221053.123

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ts.debug

syntax: ts.debug(TAG?, MESSAGE)

context: global

description: Log the MESSAGE to traffic.out if debug TAG is enabled(the default TAG is ts_lua).

Here is an example:

ts.debug('I am in do_remap now.')
ts.debug("scw", "hello world")

We should write this TAG in records.config(If TAG is missing, default TAG will be set):

CONFIG proxy.config.diags.debug.tags STRING TAG

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Remap status constants

context: do_remap

TS_LUA_REMAP_NO_REMAP (0)
TS_LUA_REMAP_DID_REMAP (1)
TS_LUA_REMAP_NO_REMAP_STOP (2)
TS_LUA_REMAP_DID_REMAP_STOP (3)
TS_LUA_REMAP_ERROR (-1)

These constants are usually used as return value of do_remap function.

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ts.remap.get_to_url_host

syntax: ts.remap.get_to_url_host()

context: do_remap

description: retrieve the “to” host of the remap rule

Here is an example:

function do_remap()
    local to_host = ts.remap.get_to_url_host()
    ts.debug(to_host)
    return 0
end

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ts.remap.get_to_url_port

syntax: ts.remap.get_to_url_port()

context: do_remap

description: retrieve the “to” port of the remap rule

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ts.remap.get_to_url_scheme

syntax: ts.remap.get_to_url_scheme()

context: do_remap

description: retrieve the “to” scheme of the remap rule

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ts.remap.get_to_uri

syntax: ts.remap.get_to_uri()

context: do_remap

description: retrieve the “to” path of the remap rule

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ts.remap.get_to_url

syntax: ts.remap.get_to_url()

context: do_remap

description: retrieve the “to” url of the remap rule

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ts.remap.get_from_url_host

syntax: ts.remap.get_from_url_host()

context: do_remap

description: retrieve the “from” host of the remap rule

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ts.remap.get_from_url_port

syntax: ts.remap.get_from_url_port()

context: do_remap

description: retrieve the “from” port of the remap rule

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ts.remap.get_from_url_scheme

syntax: ts.remap.get_from_url_scheme()

context: do_remap

description: retrieve the “from” scheme of the remap rule

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ts.remap.get_from_uri

syntax: ts.remap.get_from_uri()

context: do_remap

description: retrieve the “from” path of the remap rule

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ts.remap.get_from_url

syntax: ts.remap.get_from_url()

context: do_remap

description: retrieve the “from” url of the remap rule

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ts.hook

syntax: ts.hook(HOOK_POINT, FUNCTION)

context: global or do_remap/do_os_response or do_global_* or later

description: Hooks are points in http transaction processing where we can step in and do some work. FUNCTION will be called when the http transaction steps in to HOOK_POINT.

Here is an example

function send_response()
    s.client_response.header['SHE'] = 'belief'
end

function do_remap()
    ts.hook(TS_LUA_HOOK_SEND_RESPONSE_HDR, send_response)
end

Then the client will get the response like this:

HTTP/1.1 200 OK
Content-Type: text/html
Server: ATS/3.2.0
SHE: belief
Connection: Keep-Alive
...

You can create global hook as well

function do_some_work()
   ts.debug('do_some_work')
   return 0
end

ts.hook(TS_LUA_HOOK_READ_REQUEST_HDR, do_some_work)

Or you can do it this way
ts.hook(TS_LUA_HOOK_READ_REQUEST_HDR,
    function()
        ts.debug('do_some_work')
        return 0
    end
)

Also the return value of the function will control how the transaction will be re-enabled. Return value of 0 will cause the transaction to be re-enabled normally (TS_EVENT_HTTP_CONTINUE). Return value of 1 will be using TS_EVENT_HTTP_ERROR instead.

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Hook point constants

TS_LUA_HOOK_OS_DNS
TS_LUA_HOOK_PRE_REMAP
TS_LUA_HOOK_READ_CACHE_HDR
TS_LUA_HOOK_TXN_CLOSE
TS_LUA_HOOK_POST_REMAP
TS_LUA_HOOK_CACHE_LOOKUP_COMPLETE
TS_LUA_HOOK_READ_REQUEST_HDR
TS_LUA_HOOK_SEND_REQUEST_HDR
TS_LUA_HOOK_READ_RESPONSE_HDR
TS_LUA_HOOK_SEND_RESPONSE_HDR
TS_LUA_REQUEST_TRANSFORM
TS_LUA_RESPONSE_TRANSFORM

These constants are usually used in ts.hook method call.

Additional Information:

Hook Point Lua Hook Point constant Hook function be registered within do_remap() via ts.hook()? Hook function be registered within do_os_response() via ts.hook()? Hook function be registered within global context via ts.hook()?
TS_HTTP_TXN _START_HOOK TS_LUA_HOOK _TXN_START NO NO YES
TS_HTTP_READ _REQUEST_HDR_HOOK TS_LUA_HOOK _READ_REQUEST_HDR NO NO YES
TS_HTTP_PRE _REMAP_HOOK TS_LUA_HOOK _PRE_REMAP NO NO YES
TS_HTTP_POST _REMAP_HOOK TS_LUA_HOOK _POST_REMAP YES NO YES
TS_HTTP_READ _CACHE_HDR_HOOK TS_LUA_HOOK _READ_CACHE_HDR YES NO YES
TS_HTTP_OS _DNS_HOOK TS_LUA_HOOK _OS_DNS YES NO YES
TS_HTTP_CACHE _LOOKUP_COMPLETE_HOOK TS_LUA_HOOK _CACHE_LOOKUP_COMPLETE YES NO YES
TS_HTTP_SEND _REQUEST_HDR_HOOK TS_LUA_HOOK _SEND_REQUEST_HDR YES NO YES
TS_HTTP_READ _RESPONSE_HDR_HOOK TS_LUA_HOOK _READ_RESPONSE_HDR YES YES YES
TS_HTTP_SEND _RESPONSE_HDR_HOOK TS_LUA_HOOK _SEND_RESPONSE_HDR YES YES YES
TS_HTTP_REQUEST _TRANSFORM_HOOK TS_LUA_REQUEST_TRANSFORM YES NO YES
TS_HTTP_RESPONSE _TRANSFORM_HOOK TS_LUA_RESPONSE_TRANSFORM YES YES YES
TS_HTTP_TXN _CLOSE_HOOK TS_LUA_HOOK_TXN_CLOSE YES YES YES

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ts.ctx

syntax: ts.ctx[KEY] = VALUE

syntax: VALUE = ts.ctx[KEY]

context: do_remap/do_os_response or do_global_* or later

description: This table can be used to store per-request Lua context data and has a life time identical to the current request.

Here is an example:

function send_response()
    ts.client_response.header['F-Header'] = ts.ctx['hdr']
    return 0
end

function do_remap()
    ts.ctx['hdr'] = 'foo'
    ts.hook(TS_LUA_HOOK_SEND_RESPONSE_HDR, send_response)
    return 0
end

Then the client will get the response like this:

HTTP/1.1 200 OK
Content-Type: text/html
Server: ATS/3.2.0
F-Header: foo
Connection: Keep-Alive
...

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ts.client_request.get_method

syntax: ts.client_request.get_method()

context: do_remap/do_os_response or do_global_* or later

description: This function can be used to retrieve the current client request’s method name. String like “GET” or “POST” is returned.

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ts.client_request.set_method

syntax: ts.client_request.set_method()

context: do_remap or do_global_*

description: This function can be used to override the current client request’s method with METHOD_NAME.

ts.client_request.get_version

syntax: ver = ts.client_request.get_version()

context: do_remap/do_os_response or do_global_* or later

description: Return the http version string of the client request.

Current possible values are 1.0, 1.1, and 0.9.

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ts.client_request.set_version

syntax: ts.client_request.set_version(VERSION_STR)

context: do_remap or do_global_* or later

description: Set the http version of the client request with the VERSION_STR

ts.client_request.set_version('1.0')

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ts.client_request.get_uri

syntax: ts.client_request.get_uri()

context: do_remap/do_os_response or later

description: This function can be used to retrieve the client request’s path.

Here is an example:

function do_remap()
    local uri = ts.client_request.get_uri()
    print(uri)
end

Then GET /st?a=1 will yield the output:

/st

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ts.client_request.set_uri

syntax: ts.client_request.set_uri(PATH)

context: do_remap or do_global_*

description: This function can be used to override the client request’s path.

The PATH argument must be a Lua string and starts with /

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ts.client_request.get_uri_args

syntax: ts.client_request.get_uri_args()

context: do_remap/do_os_response or do_global_* or later

description: This function can be used to retrieve the client request’s query string.

Here is an example:

function do_remap()
    local query = ts.client_request.get_uri_args()
    print(query)
end

Then GET /st?a=1&b=2 will yield the output:

a=1&b=2

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ts.client_request.set_uri_args

syntax: ts.client_request.set_uri_args(QUERY_STRING)

context: do_remap or do_global_*

description: This function can be used to override the client request’s query string.

ts.client_request.set_uri_args('n=6&p=7')

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ts.client_request.get_uri_params

syntax: ts.client_request.get_uri_params()

context: do_remap/do_os_response or do_global_* or later

description: This function can be used to retrieve the client request’s parameter string.

Here is an example:

function do_remap()
    local query = ts.client_request.get_uri_params()
    print(query)
end

Then GET /st;a=1 will yield the output:

a=1

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ts.client_request.set_uri_params

syntax: ts.client_request.set_uri_params(PARAMETER_STRING)

context: do_remap or do_global_*

description: This function can be used to override the client request’s parameter string.

ts.client_request.set_uri_params('n=6')

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ts.client_request.get_url

syntax: ts.client_request.get_url()

context: do_remap/do_os_response or do_global_* or later

description: This function can be used to retrieve the whole client request’s url.

Here is an example:

function do_remap()
    local url = ts.client_request.get_url()
    print(url)
end

Then GET /st?a=1&b=2 HTTP/1.1\r\nHost: a.tbcdn.cn\r\n... will yield the output:

http://a.tbcdn.cn/st?a=1&b=2

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ts.client_request.header.HEADER

syntax: ts.client_request.header.HEADER = VALUE

syntax: ts.client_request.header[HEADER] = VALUE

syntax: VALUE = ts.client_request.header.HEADER

context: do_remap/do_os_response or do_global_* or later

description: Set, add to, clear or get the current client request’s HEADER.

Here is an example:

function do_remap()
    local ua = ts.client_request.header['User-Agent']
    print(ua)
    ts.client_request.header['Host'] = 'a.tbcdn.cn'
end

Then GET /st HTTP/1.1\r\nHost: b.tb.cn\r\nUser-Agent: Mozilla/5.0\r\n... will yield the output:

Mozilla/5.0

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ts.client_request.get_headers

syntax: ts.client_request.get_headers()

context: do_remap/do_os_response or do_global_* or later

description: Returns a Lua table holding all the headers for the current client request.

Here is an example:

function do_remap()
    hdrs = ts.client_request.get_headers()
    for k, v in pairs(hdrs) do
        print(k..': '..v)
    end
end

Then GET /st HTTP/1.1\r\nHost: b.tb.cn\r\nUser-Aget: Mozilla/5.0\r\nAccept: */* will yield the output

Host: b.tb.cn
User-Agent: Mozilla/5.0
Accept: */*

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ts.client_request.client_addr.get_addr

syntax: ts.client_request.client_addr.get_addr()

context: do_remap/do_os_response or do_global_* or later

description: This function can be used to get socket address of the client.

The ts.client_request.client_addr.get_addr function returns three values, ip is a string, port and family is number.

Here is an example:

function do_remap()
    ip, port, family = ts.client_request.client_addr.get_addr()
    print(ip)               -- 192.168.231.17
    print(port)             -- 17786
    print(family)           -- 2(AF_INET)
    return 0
end

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ts.client_request.client_addr.get_incoming_port

syntax: ts.client_request.client_addr.get_incoming_port()

context: do_remap/do_os_response or do_global_* or later

description: This function can be used to get incoming port of the request.

The ts.client_request.client_addr.get_incoming_port function returns incoming port as number.

Here is an example:

function do_global_read_request()
    port = ts.client_request.client_addr.get_incoming_port()
    print(port)             -- 80
end

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ts.client_request.get_url_host

syntax: host = ts.client_request.get_url_host()

context: do_remap/do_os_response or do_global_* or later

description: Return the host field of the request url.

Here is an example:

function do_remap()
    local url_host = ts.client_request.get_url_host()
    print(url_host)
end

Then GET /liuyurou.txt HTTP/1.1\r\nHost: 192.168.231.129:8080\r\n... will yield the output:

192.168.231.129

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ts.client_request.set_url_host

syntax: ts.client_request.set_url_host(str)

context: do_remap or do_global_*

description: Set host field of the request url with str. This function is used to change the address of the origin server, and we should return TS_LUA_REMAP_DID_REMAP(_STOP) in do_remap.

Here is an example:

function do_remap()
    ts.client_request.set_url_host('192.168.231.130')
    ts.client_request.set_url_port(80)
    ts.client_request.set_url_scheme('http')
    return TS_LUA_REMAP_DID_REMAP
end

remap.config like this:

map http://192.168.231.129:8080/ http://192.168.231.129:9999/

Then server request will connect to 192.168.231.130:80

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ts.client_request.get_url_port

syntax: port = ts.client_request.get_url_port()

context: do_remap/do_os_response or do_global_* or later

description: Returns the port field of the request url as a Lua number.

Here is an example:

function do_remap()
    local url_port = ts.client_request.get_url_port()
    print(url_port)
end

Then Then GET /liuyurou.txt HTTP/1.1\r\nHost: 192.168.231.129:8080\r\n... will yield the output:

8080

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ts.client_request.set_url_port

syntax: ts.client_request.set_url_port(NUMBER)

context: do_remap or do_global_*

description: Set port field of the request url with NUMBER. This function is used to change the address of the origin server, and we should return TS_LUA_REMAP_DID_REMAP(_STOP) in do_remap.

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ts.client_request.get_url_scheme

syntax: scheme = ts.client_request.get_url_scheme()

context: do_remap/do_os_response or do_global_* or later

description: Return the scheme field of the request url.

Here is an example:

function do_remap()
    local url_scheme = ts.client_request.get_url_scheme()
    print(url_scheme)
end

Then GET /liuyurou.txt HTTP/1.1\r\nHost: 192.168.231.129:8080\r\n... will yield the output:

http

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ts.client_request.set_url_scheme

syntax: ts.client_request.set_url_scheme(str)

context: do_remap or do_global_*

description: Set scheme field of the request url with str. This function is used to change the scheme of the server request, and we should return TS_LUA_REMAP_DID_REMAP(_STOP) in do_remap.

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ts.http.set_cache_url

syntax: ts.http.set_cache_url(KEY_URL)

context: do_remap or do_global_*

description: This function can be used to modify the cache key for the client request.

Here is an example:

function do_remap()
    ts.http.set_cache_url('http://a.tbcdn.cn/foo')
    return 0
end

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ts.http.get_cache_lookup_url

syntax: ts.http.get_cache_lookup_url()

context: do_global_cache_lookup_complete

description: This function can be used to get the cache lookup url for the client request.

Here is an example

function cache_lookup()
    ts.http.set_cache_lookup_url('http://bad.com/bad.html')
    local cache = ts.http.get_cache_lookup_url()
    ts.debug(cache)
end

function do_remap()
    ts.hook(TS_LUA_HOOK_CACHE_LOOKUP_COMPLETE, cache_lookup)
    return 0
end

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ts.http.set_cache_lookup_url

syntax: ts.http.set_cache_lookup_url()

context: do_global_cache_lookup_complete

description: This function can be used to set the cache lookup url for the client request.

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ts.http.get_parent_proxy

syntax: ts.http.get_parent_proxy()

context: do_global_cache_lookup_complete

description: This function can be used to get the parent proxy host and port.

Here is an example

function cache_lookup()
    ts.http.set_parent_proxy('test1.test.com', 1111)
    host, port = ts.http.get_parent_proxy()
    ts.debug(host)
    ts.debug(port)
end

function do_remap()
    ts.hook(TS_LUA_HOOK_CACHE_LOOKUP_COMPLETE, cache_lookup)
    return 0
end

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ts.http.set_parent_proxy

syntax: ts.http.set_parent_proxy()

context: do_global_cache_lookup_complete

description: This function can be used to set the parent proxy host and name.

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ts.http.get_parent_selection_url

syntax: ts.http.get_parent_selection_url()

context: do_global_cache_lookup_complete

description: This function can be used to get the parent selection url for the client request.

Here is an example

function cache_lookup()
    ts.http.set_parent_selection_url('http://bad.com/bad.html')
    local cache = ts.http.get_parent_selection_url()
    ts.debug(cache)
end

function do_remap()
    ts.hook(TS_LUA_HOOK_CACHE_LOOKUP_COMPLETE, cache_lookup)
    return 0
end

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ts.http.set_parent_selection_url

syntax: ts.http.set_parent_selection_url()

context: do_global_cache_lookup_complete

description: This function can be used to set the parent selection url for the client request.

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ts.http.set_server_resp_no_store

syntax: ts.http.set_server_resp_no_store(status)

context: do_global_read_response

description: This function can be used to signal ATS to not store the response in cache

Here is an example:

function do_global_read_response()
    ts.http.set_server_resp_no_store(1)
    return 0
end

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ts.http.set_resp

syntax: ts.http.set_resp(CODE, BODY)

context: do_remap or do_global_*

description: This function can be used to set response for the client with the CODE status and BODY string.

Here is an example:

function do_remap()
    ts.http.set_resp(403, "Document access failed :)\n")
    return 0
end

We will get the response like this:

HTTP/1.1 403 Forbidden
Date: Thu, 20 Mar 2014 06:12:43 GMT
Connection: close
Server: ATS/5.0.0
Cache-Control: no-store
Content-Type: text/html
Content-Language: en
Content-Length: 27

Document access failed :)

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ts.http.get_cache_lookup_status

syntax: ts.http.get_cache_lookup_status()

context: function @ TS_LUA_HOOK_CACHE_LOOKUP_COMPLETE hook point

description: This function can be used to get cache lookup status.

Here is an example:

function cache_lookup()
    local cache_status = ts.http.get_cache_lookup_status()
    if cache_status == TS_LUA_CACHE_LOOKUP_HIT_FRESH then
        print('hit')
    else
        print('not hit')
    end
end

function do_remap()
    ts.hook(TS_LUA_HOOK_CACHE_LOOKUP_COMPLETE, cache_lookup)
    return 0
end

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ts.http.set_cache_lookup_status

syntax: ts.http.set_cache_lookup_status()

context: function after TS_LUA_HOOK_CACHE_LOOKUP_COMPLETE hook point

description: This function can be used to set cache lookup status.

Here is an example:

function cache_lookup()
    local cache_status = ts.http.get_cache_lookup_status()
    if cache_status == TS_LUA_CACHE_LOOKUP_HIT_FRESH then
        print('hit')
    else
        print('not hit')
    end
    ts.http.set_cache_lookup_status(TS_LUA_CACHE_LOOKUP_MISS)
end

function do_remap()
    ts.hook(TS_LUA_HOOK_CACHE_LOOKUP_COMPLETE, cache_lookup)
    return 0
end

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Http cache lookup status constants

context: global

TS_LUA_CACHE_LOOKUP_MISS (0)
TS_LUA_CACHE_LOOKUP_HIT_STALE (1)
TS_LUA_CACHE_LOOKUP_HIT_FRESH (2)
TS_LUA_CACHE_LOOKUP_SKIPPED (3)

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ts.cached_response.get_status

syntax: status = ts.cached_response.get_status()

context: function @ TS_LUA_HOOK_CACHE_LOOKUP_COMPLETE hook point or later

description: This function can be used to retrieve the status code of the cached response. A Lua number will be returned.

Here is an example:

function cache_lookup()
    local cache_status = ts.http.get_cache_lookup_status()
    if cache_status == TS_LUA_CACHE_LOOKUP_HIT_FRESH then
        code = ts.cached_response.get_status()
        print(code)         -- 200
    end
end

function do_remap()
    ts.hook(TS_LUA_HOOK_CACHE_LOOKUP_COMPLETE, cache_lookup)
    return 0
end

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ts.cached_response.get_version

syntax: ver = ts.cached_response.get_version()

context: function @ TS_LUA_HOOK_CACHE_LOOKUP_COMPLETE hook point or later

description: Return the http version string of the cached response.

Current possible values are 1.0, 1.1, and 0.9.

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ts.cached_response.header.HEADER

syntax: VALUE = ts.cached_response.header.HEADER

syntax: VALUE = ts.cached_response.header[HEADER]

context: function @ TS_LUA_HOOK_CACHE_LOOKUP_COMPLETE hook point or later

description: get the current cached response’s HEADER.

Here is an example:

function cache_lookup()
    local status = ts.http.get_cache_lookup_status()
    if status == TS_LUA_CACHE_LOOKUP_HIT_FRESH then
        local ct = ts.cached_response.header['Content-Type']
        print(ct)         -- text/plain
    end
end

function do_remap()
    ts.hook(TS_LUA_HOOK_CACHE_LOOKUP_COMPLETE, cache_lookup)
    return 0
end

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ts.cached_response.get_headers

syntax: ts.cached_response.get_headers()

context: function @ TS_LUA_HOOK_CACHE_LOOKUP_COMPLETE hook point or later

description: Returns a Lua table holding all the headers for the current cached response.

Here is an example:

function cache_lookup()
    local status = ts.http.get_cache_lookup_status()
    if status == TS_LUA_CACHE_LOOKUP_HIT_FRESH then
        hdrs = ts.cached_response.get_headers()
        for k, v in pairs(hdrs) do
            print(k..': '..v)
        end
    end
end

function do_remap()
    ts.hook(TS_LUA_HOOK_CACHE_LOOKUP_COMPLETE, cache_lookup)
    return 0
end

We will get the output:

Connection: keep-alive
Content-Type: text/plain
Date: Thu, 20 Mar 2014 06:12:20 GMT
Cache-Control: max-age=864000
Last-Modified: Sun, 19 May 2013 13:22:01 GMT
Accept-Ranges: bytes
Content-Length: 15
Server: ATS/5.0.0

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ts.server_request.get_uri

syntax: ts.server_request.get_uri()

context: function @ TS_LUA_HOOK_SEND_REQUEST_HDR hook point or later

description: This function can be used to retrieve the server request’s path.

Here is an example:

function send_request()
    local uri = ts.server_request.get_uri()
    print(uri)
end

function do_remap()
    ts.hook(TS_LUA_HOOK_SEND_REQUEST_HDR, send_request)
    return 0
end

Then GET /am.txt?a=1 will yield the output:

/am.txt

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ts.server_request.set_uri

syntax: ts.server_request.set_uri(PATH)

context: function @ TS_LUA_HOOK_SEND_REQUEST_HDR hook point

description: This function can be used to override the server request’s path.

The PATH argument must be a Lua string and starts with /

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ts.server_request.get_uri_args

syntax: ts.server_request.get_uri_args()

context: function @ TS_LUA_HOOK_SEND_REQUEST_HDR hook point or later

description: This function can be used to retrieve the server request’s query string.

Here is an example:

function send_request()
    local query = ts.server_request.get_uri_args()
    print(query)
end

function do_remap()
    ts.hook(TS_LUA_HOOK_SEND_REQUEST_HDR, send_request)
    return 0
end

Then GET /st?a=1&b=2 will yield the output:

a=1&b=2

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ts.server_request.set_uri_args

syntax: ts.server_request.set_uri_args(QUERY_STRING)

context: function @ TS_LUA_HOOK_SEND_REQUEST_HDR hook point

description: This function can be used to override the server request’s query string.

ts.server_request.set_uri_args('n=6&p=7')

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ts.server_request.get_uri_params

syntax: ts.server_request.get_uri_params()

context: function @ TS_LUA_HOOK_SEND_REQUEST_HDR hook point or later

description: This function can be used to retrieve the server request’s parameter string.

Here is an example:

function send_request()
    local query = ts.server_request.get_uri_params()
    print(query)
end

function do_remap()
    ts.hook(TS_LUA_HOOK_SEND_REQUEST_HDR, send_request)
    return 0
end

Then GET /st;a=1 will yield the output:

a=1

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ts.server_request.set_uri_params

syntax: ts.server_request.set_uri_params(PARAMETER_STRING)

context: function @ TS_LUA_HOOK_SEND_REQUEST_HDR hook point

description: This function can be used to override the server request’s parameter string.

ts.server_request.set_uri_params('n=6')

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ts.server_request.header.HEADER

syntax: ts.server_request.header.HEADER = VALUE

syntax: ts.server_request.header[HEADER] = VALUE

syntax: VALUE = ts.server_request.header.HEADER

context: function @ TS_LUA_HOOK_SEND_REQUEST_HDR hook point or later

description: Set, add to, clear or get the current server request’s HEADER.

Here is an example:

function send_request()
    local ua = ts.server_request.header['User-Agent']
    print(ua)
    ts.server_request.header['Accept-Encoding'] = 'gzip'
end

function do_remap()
    ts.hook(TS_LUA_HOOK_SEND_REQUEST_HDR, send_request)
    return 0
end

Then GET /st HTTP/1.1\r\nHost: b.tb.cn\r\nUser-Agent: Mozilla/5.0\r\n... will yield the output:

Mozilla/5.0

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ts.server_request.get_headers

syntax: ts.server_request.get_headers()

context: function @ TS_LUA_HOOK_SEND_REQUEST_HDR hook point or later

description: Returns a Lua table holding all the headers for the current server request.

Here is an example:

function send_request()
    hdrs = ts.cached_response.get_headers()
    for k, v in pairs(hdrs) do
        print(k..': '..v)
    end
end

function do_remap()
    ts.hook(TS_LUA_HOOK_SEND_REQUEST_HDR, send_request)
    return 0
end

We will get the output:

Host: b.tb.cn
User-Agent: curl/7.19.7
Accept: */*

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ts.server_request.server_addr.set_addr

syntax: ts.server_request.server_addr.set_addr()

context: no later than function @ TS_LUA_HOOK_OS_DNS hook point

description: This function can be used to set socket address of the origin server.

The ts.server_request.server_addr.set_addr function requires three inputs, ip is a string, port and family is number.

Here is an example:

function do_global_read_request()
    ts.server_request.server_addr.set_addr("192.168.231.17", 80, TS_LUA_AF_INET)
end

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Socket address family

context: global

TS_LUA_AF_INET (2)
TS_LUA_AF_INET6 (10)

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ts.server_request.server_addr.get_addr

syntax: ts.server_request.server_addr.get_addr()

context: function @ TS_LUA_HOOK_SEND_REQUEST_HDR hook point or later

description: This function can be used to get socket address of the origin server.

The ts.server_request.server_addr.get_addr function returns three values, ip is a string, port and family is number.

Here is an example:

function do_global_send_request()
    ip, port, family = ts.server_request.server_addr.get_addr()
    print(ip)               -- 192.168.231.17
    print(port)             -- 80
    print(family)           -- 2(AF_INET)
end

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ts.server_request.server_addr.get_ip

syntax: ts.server_request.server_addr.get_ip()

context: function @ TS_LUA_HOOK_SEND_REQUEST_HDR hook point or later

description: This function can be used to get ip address of the origin server.

The ts.server_request.server_addr.get_ip function returns ip as a string.

Here is an example:

function do_global_send_request()
    ip = ts.server_request.server_addr.get_ip()
    print(ip)               -- 192.168.231.17
end

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ts.server_request.server_addr.get_port

syntax: ts.server_request.server_addr.get_port()

context: function @ TS_LUA_HOOK_SEND_REQUEST_HDR hook point or later

description: This function can be used to get port of the origin server.

The ts.server_request.server_addr.get_port function returns port as number.

Here is an example:

function do_global_send_request()
    port = ts.server_request.server_addr.get_port()
    print(port)             -- 80
end

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ts.server_request.server_addr.get_outgoing_port

syntax: ts.server_request.server_addr.get_outgoing_port()

context: function @ TS_LUA_HOOK_SEND_REQUEST_HDR hook point or later

description: This function can be used to get outgoing port to the origin server.

The ts.server_request.server_addr.get_outgoing_port function returns outgoing port as number.

Here is an example:

function do_global_send_request()
    port = ts.server_request.server_addr.get_outgoing_port()
    print(port)             -- 50880
end

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ts.server_request.get_url_host

syntax: host = ts.server_request.get_url_host()

context: function @ TS_LUA_HOOK_SEND_REQUEST_HDR hook point

description: Return the host field of the request url.

Here is an example:

function send_request()
    local url_host = ts.server_request.get_url_host()
    print(url_host)
end

function do_remap()
    ts.hook(TS_LUA_HOOK_SEND_REQUEST_HDR, send_request)
    return 0
end

Then GET http://abc.com/p2/a.txt HTTP/1.1 will yield the output:

abc.com

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ts.server_request.set_url_host

syntax: ts.server_request.set_url_host(str)

context: function @ TS_LUA_HOOK_SEND_REQUEST_HDR hook point

description: Set host field of the request url with str. This function is used to change the host name in the GET request to next tier

Here is an example:

function send_request()
    ts.server_request.set_url_host("")
    ts.server_request.set_url_scheme("")
end

function do_remap()
    ts.hook(TS_LUA_HOOK_SEND_REQUEST_HDR, send_request)
    return 0
end

The GET request like this:

+++++++++ Proxy's Request +++++++++
– State Machine Id: 5593
GET http://origin.com/dir1/a.txt HTTP/1.1
User-Agent: curl/7.29.0
Host: abc.com
Accept: /
Client-ip: 135.xx.xx.xx
X-Forwarded-For: 135.xx.xx.xx

Will be changed to:

+++++++++ Proxy's Request +++++++++
– State Machine Id: 5593
GET /dir1/a.txt HTTP/1.1
User-Agent: curl/7.29.0
Host: abc.com
Accept: /
Client-ip: 135.xx.xx.xx
X-Forwarded-For: 135.xx.xx.xx

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ts.server_request.get_url_scheme

syntax: scheme = ts.server_request.get_url_scheme()

context: function @ TS_LUA_HOOK_SEND_REQUEST_HDR hook point

description: Return the scheme field of the request url.

Here is an example:

function send_request()
    local url_scheme = ts.server_request.get_url_scheme()
    print(url_host)
end

function do_remap()
    ts.hook(TS_LUA_HOOK_SEND_REQUEST_HDR, send_request)
    return 0
end

Then GET /liuyurou.txt HTTP/1.1\r\nHost: 192.168.231.129:8080\r\n... will yield the output:

http

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ts.server_request.set_url_scheme

syntax: ts.server_request.set_url_scheme(str)

context: function @ TS_LUA_HOOK_SEND_REQUEST_HDR hook point

description: Set scheme field of the request url with str. This function is used to change the scheme of the server request.

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ts.server_response.get_status

syntax: status = ts.server_response.get_status()

context: function @ TS_LUA_HOOK_READ_RESPONSE_HDR hook point or later

description: This function can be used to retrieve the status code of the origin server’s response. A Lua number will be returned.

Here is an example:

function read_response()
    local code = ts.server_response.get_status()
    print(code)         -- 200
end

function do_remap()
    ts.hook(TS_LUA_HOOK_READ_RESPONSE_HDR, read_response)
    return 0
end

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ts.server_response.set_status

syntax: ts.server_response.set_status(NUMBER)

context: function @ TS_LUA_HOOK_READ_RESPONSE_HDR hook point

description: This function can be used to set the status code of the origin server’s response.

Here is an example:

function read_response()
    ts.server_response.set_status(404)
end

function do_remap()
    ts.hook(TS_LUA_HOOK_READ_RESPONSE_HDR, read_response)
    return 0
end

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ts.server_response.get_version

syntax: ver = ts.server_response.get_version()

context: function @ TS_LUA_HOOK_READ_RESPONSE_HDR hook point or later.

description: Return the http version string of the server response.

Current possible values are 1.0, 1.1, and 0.9.

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ts.server_response.set_version

syntax: ts.server_response.set_version(VERSION_STR)

context: function @ TS_LUA_HOOK_READ_RESPONSE_HDR hook point

description: Set the http version of the server response with the VERSION_STR

ts.server_response.set_version('1.0')

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ts.server_response.header.HEADER

syntax: ts.server_response.header.HEADER = VALUE

syntax: ts.server_response.header[HEADER] = VALUE

syntax: VALUE = ts.server_response.header.HEADER

context: function @ TS_LUA_HOOK_READ_RESPONSE_HDR hook point or later.

description: Set, add to, clear or get the current server response’s HEADER.

Here is an example:

function read_response()
    local ct = ts.server_response.header['Content-Type']
    print(ct)
    ts.server_response.header['Cache-Control'] = 'max-age=14400'
end

function do_remap()
    ts.hook(TS_LUA_HOOK_READ_RESPONSE_HDR, read_response)
    return 0
end

We will get the output:

text/html

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ts.server_response.get_headers

syntax: ts.server_response.get_headers()

context: function @ TS_LUA_HOOK_READ_RESPONSE_HDR hook point or later

description: Returns a Lua table holding all the headers for the current server response.

Here is an example:

function read_response()
    hdrs = ts.server_response.get_headers()
    for k, v in pairs(hdrs) do
        print(k..': '..v)
    end
end

function do_remap()
    ts.hook(TS_LUA_HOOK_READ_RESPONSE_HDR, read_response)
    return 0
end

We will get the output:

Server: nginx/1.5.9
Date: Tue, 18 Mar 2014 10:12:25 GMT
Content-Type: text/html
Content-Length: 555
Last-Modified: Mon, 19 Aug 2013 14:25:55 GMT
Connection: keep-alive
ETag: "52122af3-22b"
Cache-Control: max-age=14400
Accept-Ranges: bytes

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ts.client_response.get_status

syntax: status = ts.client_response.get_status()

context: function @ TS_LUA_HOOK_SEND_RESPONSE_HDR hook point

description: This function can be used to retrieve the status code of the response to the client. A Lua number will be returned.

Here is an example:

function send_response()
    local code = ts.client_response.get_status()
    print(code)         -- 200
end

function do_remap()
    ts.hook(TS_LUA_HOOK_SEND_RESPONSE_HDR, send_response)
    return 0
end

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ts.client_response.set_status

syntax: ts.client_response.set_status(NUMBER)

context: function @ TS_LUA_HOOK_SEND_RESPONSE_HDR hook point

description: This function can be used to set the status code of the response to the client.

Here is an example:

function send_response()
    ts.client_response.set_status(404)
end

function do_remap()
    ts.hook(TS_LUA_HOOK_SEND_RESPONSE_HDR, send_response)
    return 0
end

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ts.client_response.get_version

syntax: ver = ts.client_response.get_version()

context: function @ TS_LUA_HOOK_SEND_RESPONSE_HDR hook point.

description: Return the http version string of the response to the client.

Current possible values are 1.0, 1.1, and 0.9.

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ts.client_response.set_version

syntax: ts.client_response.set_version(VERSION_STR)

context: function @ TS_LUA_HOOK_SEND_RESPONSE_HDR hook point

description: Set the http version of the response to the client with the VERSION_STR

ts.client_response.set_version('1.0')

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ts.client_response.header.HEADER

syntax: ts.client_response.header.HEADER = VALUE

syntax: ts.client_response.header[HEADER] = VALUE

syntax: VALUE = ts.client_response.header.HEADER

context: function @ TS_LUA_HOOK_SEND_RESPONSE_HDR hook point.

description: Set, add to, clear or get the current client response’s HEADER.

Here is an example:

function send_response()
    local ct = ts.client_response.header['Content-Type']
    print(ct)
    ts.client_response.header['Cache-Control'] = 'max-age=3600'
end

function do_remap()
    ts.hook(TS_LUA_HOOK_SEND_RESPONSE_HDR, send_response)
    return 0
end

We will get the output:

text/html

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ts.client_response.get_headers

syntax: ts.client_response.get_headers()

context: function @ TS_LUA_HOOK_SEND_RESPONSE_HDR hook point.

description: Returns a Lua table holding all the headers for the current client response.

Here is an example:

function send_response()
    hdrs = ts.client_response.get_headers()
    for k, v in pairs(hdrs) do
        print(k..': '..v)
    end
end

function do_remap()
    ts.hook(TS_LUA_HOOK_SEND_RESPONSE_HDR, send_response)
    return 0
end

We will get the output:

Server: ATS/5.0.0
Date: Tue, 18 Mar 2014 10:12:25 GMT
Content-Type: text/html
Transfer-Encoding: chunked
Last-Modified: Mon, 19 Aug 2013 14:25:55 GMT
Connection: keep-alive
Cache-Control: max-age=14400
Age: 2641
Accept-Ranges: bytes

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ts.client_response.set_error_resp

syntax: ts.client_response.set_error_resp(CODE, BODY)

context: function @ TS_LUA_HOOK_SEND_RESPONSE_HDR hook point.

description: This function can be used to set the error response to the client.

With this function we can jump to send error response to the client if exception exists, meanwhile we should return -1 from the function where exception raises.

Here is an example:

function send_response()
    ts.client_response.set_error_resp(404, 'bad luck :(\n')
end

function cache_lookup()
    return -1
end

function do_remap()
    ts.hook(TS_LUA_HOOK_CACHE_LOOKUP_COMPLETE, cache_lookup)
    ts.hook(TS_LUA_HOOK_SEND_RESPONSE_HDR, send_response)
    return 0
end

We will get the response like this:

HTTP/1.1 404 Not Found
Date: Tue, 18 Mar 2014 11:16:00 GMT
Connection: keep-alive
Server: ATS/5.0.0
Content-Length: 12

bad luck :(

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Number constants

context: global

TS_LUA_INT64_MAX (9223372036854775808)
TS_LUA_INT64_MIN (-9223372036854775808L)

These constants are usually used in transform handler.

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ts.http.resp_cache_transformed

syntax: ts.http.resp_cache_transformed(BOOL)

context: do_remap/do_os_response or do_global_* or later

description: This function can be used to tell trafficserver whether to cache the transformed data.

Here is an example:

function upper_transform(data, eos)
    return string.upper(data), eos
end

function do_remap()
    ts.hook(TS_LUA_RESPONSE_TRANSFORM, upper_transform)
    ts.http.resp_cache_transformed(0)
    return 0
end

This function is usually called after we hook TS_LUA_RESPONSE_TRANSFORM.

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ts.http.resp_cache_untransformed

syntax: ts.http.resp_cache_untransformed(BOOL)

context: do_remap/do_os_response or do_global_* or later

description: This function can be used to tell trafficserver whether to cache the untransformed data.

Here is an example:

function upper_transform(data, eos)
    return string.upper(data), eos
end

function do_remap()
    ts.hook(TS_LUA_RESPONSE_TRANSFORM, upper_transform)
    ts.http.resp_cache_untransformed(1)
    return 0
end

This function is usually called after we hook TS_LUA_RESPONSE_TRANSFORM.

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ts.http.resp_transform.get_upstream_bytes

syntax: ts.http.resp_transform.get_upstream_bytes()

context: transform handler

description: This function can be used to retrive the total bytes to be received from the upstream. If we got chunked response body from origin server, TS_LUA_INT64_MAX will be returned.

Here is an example:

local APPEND_DATA = 'TAIL\n'

function append_transform(data, eos)
    if ts.ctx['len_set'] == nil then
        local sz = ts.http.resp_transform.get_upstream_bytes()
        if sz ~= TS_LUA_INT64_MAX then
            ts.http.resp_transform.set_downstream_bytes(sz + string.len(APPEND_DATA))
        end

        ts.ctx['len_set'] = true
    end

    if eos == 1 then
        return data .. APPEND_DATA, eos
    else
        return data, eos
    end
end

function do_remap()
    ts.hook(TS_LUA_RESPONSE_TRANSFORM, append_transform)
    ts.http.resp_cache_transformed(0)
    ts.http.resp_cache_untransformed(1)
    return 0
end

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ts.http.resp_transform.set_downstream_bytes

syntax: ts.http.resp_transform.set_downstream_bytes(NUMBER)

context: transform handler

description: This function can be used to set the total bytes to be sent to the downstream.

Sometimes we want to set Content-Length header in client_response, and this function should be called before any real data is returned from the transform handler.

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ts.http.skip_remapping_set

syntax: ts.http.skip_remapping_set(BOOL)

context: do_global_read_request

description: This function can be used to tell trafficserver to skip doing remapping

Here is an example:

function do_global_read_request()
    ts.http.skip_remapping_set(1);
    ts.client_request.header['Host'] = 'www.yahoo.com'
    return 0
end

This function is usually called in do_global_read_request function

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ts.http.get_client_protocol_stack

syntax: ts.http.get_client_protocol_stack()

context: do_remap/do_os_response or do_global_* or later

description: This function can be used to get client protocol stack information

Here is an example:

function do_global_read_request()
    local stack = {ts.http.get_client_protocol_stack()}
    for k,v in pairs(stack) do
      ts.debug(v)
    end
    return 0
end

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ts.http.server_push

syntax: ts.http.server_push()

context: do_remap/do_os_response or do_global_* or later

description: This function can do http/2 server push for the input url

Here is an example:

function do_global_read_request()
    ts.http.server_push("https://test.com/test.js")
    return 0
end

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ts.http.is_websocket

syntax: ts.http.is_websocket()

context: do_remap/do_os_response or do_global_* or later

description: This function can be used to tell if the transacton is websocket

Here is an example:

function do_global_read_request()
    local flag = ts.http.is_websocket()
    ts.debug(flag)
    return 0
end

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ts.http.get_plugin_tag

syntax: ts.http.get_plugin_tag()

context: do_remap/do_os_response or do_global_* or later

description: This function can be used to get plugin tag of a transaction

Here is an example:

function do_global_read_request()
    local tag = ts.http.get_plugin_tag() or ''
    ts.debug(tag)
    return 0
end

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ts.http.id

syntax: ts.http.id()

context: do_remap/do_os_response or do_global_* or later

description: This function can be used to tell id of a transaction

Here is an example:

function do_global_read_request()
    local id = ts.http.id()
    ts.debug(id)
    return 0
end

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ts.http.is_internal_request

syntax: ts.http.is_internal_request()

context: do_remap/do_os_response or do_global_* or later

description: This function can be used to tell is a request is internal or not

Here is an example:

function do_global_read_request()
    local internal = ts.http.is_internal_request()
    ts.debug(internal)
    return 0
end

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ts.http.transaction_count

syntax: ts.http.transaction_count()

context: do_remap/do_os_response or do_global_* or later

description: This function returns the number of transaction in this connection

Here is an example

function do_remap()
    local count = ts.http.transaction_count()
    ts.debug(tostring(count))
    return 0
end

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ts.http.redirect_url_set

syntax: ts.http.redirect_url_set()

context: do_remap/do_os_response or do_global_* or later

description: This function sets the redirect url and instructs the transaction to follow the redirection as response

Here is an example

function do_global_read_response()
    ts.http.redirect_url_set('http://foo.com')
    return 0
end

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ts.http.get_server_state

syntax: ts.http.get_server_state()

context: do_remap/do_os_response or do_global_* or later

description: This function returns the current server state

Here is an example

function do_os_response()
    local result = ts.http.get_server_state()
    if result == TS_LUA_SRVSTATE_CONNECTION_ALIVE then
      ts.debug('Alive')
    end
end

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Server state constants

context: global

TS_LUA_SRVSTATE_STATE_UNDEFINED (0)
TS_LUA_SRVSTATE_ACTIVE_TIMEOUT (1)
TS_LUA_SRVSTATE_BAD_INCOMING_RESPONSE (2)
TS_LUA_SRVSTATE_CONNECTION_ALIVE (3)
TS_LUA_SRVSTATE_CONNECTION_CLOSED (4)
TS_LUA_SRVSTATE_CONNECTION_ERROR (5)
TS_LUA_SRVSTATE_INACTIVE_TIMEOUT(6)
TS_LUA_SRVSTATE_OPEN_RAW_ERROR (7)
TS_LUA_SRVSTATE_PARSE_ERROR (8)
TS_LUA_SRVSTATE_TRANSACTION_COMPLETE (9)
TS_LUA_SRVSTATE_CONGEST_CONTROL_CONGESTED_ON_F (10)
TS_LUA_SRVSTATE_CONGEST_CONTROL_CONGESTED_ON_M (11)

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ts.add_package_path

syntax: ts.add_package_path(lua-style-path-str)

context: init stage of the lua script

description: Adds the Lua module search path used by scripts.

The path string is in standard Lua path form.

Here is an example:

ts.add_package_path('/home/a/test/lua/pac/?.lua')
local nt = require("nt")
function do_remap()
    print(nt.t9(7979))
    return 0
end

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ts.add_package_cpath

syntax: ts.add_package_cpath(lua-style-cpath-str)

context: init stage of the lua script

description: Adds the Lua C-module search path used by scripts.

The cpath string is in standard Lua cpath form.

Here is an example:

ts.add_package_cpath('/home/a/test/c/module/?.so')
local ma = require("ma")
function do_remap()
    print(ma.ft())
    return 0
end

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ts.md5

syntax: digest = ts.md5(str)

context: global

description: Returns the hexadecimal representation of the MD5 digest of the str argument.

Here is an example:

function do_remap()
    uri = ts.client_request.get_uri()
    print(uri)              -- /foo
    print(ts.md5(uri))      -- 1effb2475fcfba4f9e8b8a1dbc8f3caf
end

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ts.md5_bin

syntax: digest = ts.md5_bin(str)

context: global

description: Returns the binary form of the MD5 digest of the str argument.

Here is an example:

function do_remap()
    uri = ts.client_request.get_uri()
    bin = ts.md5_bin(uri)
end

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ts.sha1

syntax: digest = ts.sha1(str)

context: global

description: Returns the hexadecimal representation of the SHA-1 digest of the str argument.

Here is an example:

function do_remap()
    uri = ts.client_request.get_uri()
    print(uri)              -- /foo
    print(ts.sha1(uri))     -- 6dbd548cc03e44b8b44b6e68e56255ce4273ae49
end

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ts.sha1_bin

syntax: digest = ts.sha1_bin(str)

context: global

description: Returns the binary form of the SHA-1 digest of the str argument.

Here is an example:

function do_remap()
    uri = ts.client_request.get_uri()
    bin = ts.sha1_bin(uri)
end

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ts.base64_encode

syntax: value = ts.base64_encode(str)

context: global

description: Returns the base64 encoding of the str argument.

Here is an example:

function do_remap()
    uri = ts.client_request.get_uri()
    value = ts.base64_encode(uri)
end

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ts.base64_decode

syntax: value = ts.base64_decode(str)

context: global

description: Returns the base64 decoding of the str argument.

Here is an example:

function do_remap()
    uri = ts.client_request.get_uri()
    encoded_value = ts.base64_encode(uri)
    decoded_value = ts.base64_decode(encoded_value)
end

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ts.escape_uri

syntax: value = ts.escape_uri(str)

context: global

description: Returns the uri-escaped value of the str argument.

Here is an example:

function do_remap()
    test = '/some value/'
    value = ts.escape_uri(test)
end

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ts.unescape_uri

syntax: value = ts.unescape_uri(str)

context: global

description: Returns the uri-unescaped value of the str argument.

Here is an example:

function do_remap()
    test = '/some value/'
    escaped_value = ts.escape_uri(test)
    unescaped_value = ts.unescape_uri(escaped_value)
end

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ts.fetch

syntax: res = ts.fetch(url, table?)

context: hook point functions added after do_remap

description: Issues a synchronous but still non-block http request with the url and the optional table.

Returns a Lua table with serveral slots (res.status, res.header, res.body, and res.truncated).

res.status holds the response status code.

res.header holds the response header table.

res.body holds the response body which may be truncated, you need to check res.truncated to see if the data is truncated.

Here is a basic example:

function post_remap()
    local url = string.format('http://%s/foo.txt', ts.ctx['host'])
    local res = ts.fetch(url)
    if res.status == 200 then
        print(res.body)
    end
end

function do_remap()
    local inner = ts.http.is_internal_request()
    if inner ~= 0 then
        return 0
    end
    local host = ts.client_request.header['Host']
    ts.ctx['host'] = host
    ts.hook(TS_LUA_HOOK_POST_REMAP, post_remap)
end

We can set the optional table with serveral members:

header holds the request header table.

method holds the request method. The default method is ‘GET’.

cliaddr holds the request client address in ip:port form. The default cliaddr is ‘127.0.0.1:33333’

Issuing a post request:

res = ts.fetch('http://xx.com/foo', {method = 'POST', body = 'hello world'})

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ts.fetch_multi

syntax: vec = ts.fetch_multi({{url, table?}, {url, table?}, …})

context: hook point functions added after do_remap

Just like ts.fetch, but supports multiple http requests running in parallel.

This function will fetch all the urls specified by the input table and return a table which contain all the results in the same order.

Here is an example:

local vec = ts.fetch_multi({
                {'http://xx.com/slayer'},
                {'http://xx.com/am', {cliaddr = '192.168.1.19:35423'}},
                {'http://xx.com/naga', {method = 'POST', body = 'hello world'}},
            })

for i = 1, #(vec) do
    print(vec[i].status)
end

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ts.http.intercept

syntax: ts.http.intercept(FUNCTION, param1?, param2?, …)

context: do_remap or do_global_*

description: Intercepts the client request and processes it in FUNCTION with optional params.

We should construct the response for the client request, and the request will not be processed by other modules, like hostdb, cache, origin server…

Intercept FUNCTION will be executed in a new lua_thread, so we can delivery optional params from old lua_thread to new lua_thread if needed.

Here is an example:

require 'os'

function send_data(dstr)
    local nt = os.time()..' Zheng.\n'
    local resp =  'HTTP/1.0 200 OK\r\n' ..
                  'Server: ATS/3.2.0\r\n' ..
                  'Content-Type: text/plain\r\n' ..
                  'Content-Length: ' .. string.format('%d', string.len(nt)) .. '\r\n' ..
                  'Last-Modified: ' .. os.date("%a, %d %b %Y %H:%M:%S GMT", os.time()) .. '\r\n' ..
                  'Connection: keep-alive\r\n' ..
                  'Cache-Control: max-age=7200\r\n' ..
                  'Accept-Ranges: bytes\r\n\r\n' ..
                  nt
    print(dstr)
    ts.say(resp)
end

function do_remap()
    ts.http.intercept(send_data, 'hello world')
    return 0
end

Then we will get the response like this:

HTTP/1.1 200 OK
Server: ATS/5.0.0
Content-Type: text/plain
Content-Length: 18
Last-Modified: Tue, 18 Mar 2014 08:23:12 GMT
Cache-Control: max-age=7200
Accept-Ranges: bytes
Date: Tue, 18 Mar 2014 12:23:12 GMT
Age: 0
Connection: keep-alive

1395145392 Zheng.

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ts.http.server_intercept

syntax: ts.http.server_intercept(FUNCTION, param1?, param2?, …)

context: do_remap or do_global_*

description: Intercepts the server request and acts as the origin server.

Just like ts.http.intercept, but this function will intercept the server request, and we can acts as the origin server in FUNCTION.

Here is an example:

require 'os'

function process_combo(host)
    local url1 = string.format('http://%s/css/1.css', host)
    local url2 = string.format('http://%s/css/2.css', host)
    local url3 = string.format('http://%s/css/3.css', host)

    local hdr = {
        ['Host'] = host,
        ['User-Agent'] = 'blur blur',
    }

    local ct = {
        header = hdr,
        method = 'GET'
    }

    local arr = ts.fetch_multi(
            {
                {url1, ct},
                {url2, ct},
                {url3, ct},
            })

    local ctype = arr[1].header['Content-Type']
    local body = arr[1].body .. arr[2].body .. arr[3].body

    local resp =  'HTTP/1.1 200 OK\r\n' ..
                  'Server: ATS/5.2.0\r\n' ..
                  'Last-Modified: ' .. os.date("%a, %d %b %Y %H:%M:%S GMT", os.time()) .. '\r\n' ..
                  'Cache-Control: max-age=7200\r\n' ..
                  'Accept-Ranges: bytes\r\n' ..
                  'Content-Type: ' .. ctype .. '\r\n' ..
                  'Content-Length: ' .. string.format('%d', string.len(body)) .. '\r\n\r\n' ..
                  body

    ts.say(resp)
end

function do_remap()
    local inner =  ts.http.is_internal_request()
    if inner ~= 0 then
        return 0
    end

    local h = ts.client_request.header['Host']
    ts.http.server_intercept(process_combo, h)
end

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ts.say

syntax: ts.say(data)

context: intercept or server_intercept

description: Write response to ATS within intercept or server_intercept.

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ts.flush

syntax: ts.flush()

context: intercept or server_intercept

description: Flushes the output to ATS within intercept or server_intercept.

In synchronous mode, the function will not return until all output data has been written into the system send buffer. Note that using the Lua coroutine mechanism means that this function does not block the ATS event loop even in the synchronous mode.

Here is an example:

require 'os'

function send_data()
    ss = 'wo ai yu ye hua\n'
    local resp =  'HTTP/1.0 200 OK\r\n' ..
                  'Server: ATS/3.2.0\r\n' ..
                  'Content-Type: text/plain\r\n' ..
                  'Content-Length: ' .. string.format('%d', 5*string.len(ss)) .. '\r\n' ..
                  'Last-Modified: ' .. os.date("%a, %d %b %Y %H:%M:%S GMT", os.time()) .. '\r\n' ..
                  'Connection: keep-alive\r\n' ..
                  'Cache-Control: max-age=7200\r\n' ..
                  'Accept-Ranges: bytes\r\n\r\n'
    ts.say(resp)
    for i=1, 5 do
        ts.say(ss)
        ts.flush()
    end
end

function do_remap()
    ts.http.intercept(send_data)
    return 0
end

We will get the response like this:

HTTP/1.1 200 OK
Server: ATS/5.0.0
Content-Type: text/plain
Content-Length: 80
Last-Modified: Tue, 18 Mar 2014 08:38:29 GMT
Cache-Control: max-age=7200
Accept-Ranges: bytes
Date: Tue, 18 Mar 2014 12:38:29 GMT
Age: 0
Connection: keep-alive

wo ai yu ye hua
wo ai yu ye hua
wo ai yu ye hua
wo ai yu ye hua
wo ai yu ye hua

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ts.sleep

syntax: ts.sleep(sec)

context: hook point functions added after do_remap

description: Sleeps for the specified seconds without blocking.

Behind the scene, this method makes use of the ATS event model.

Here is an example:

function send_response()
    ts.sleep(3)
end

function read_response()
    ts.sleep(3)
end

function do_remap()
    ts.hook(TS_LUA_HOOK_READ_RESPONSE_HDR, read_response)
    ts.hook(TS_LUA_HOOK_SEND_RESPONSE_HDR, send_response)
end

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ts.schedule

syntax: ts.schedule(THREAD_TYPE, sec, FUNCTION, param1?, param2?, …)

context: hook point functions added after do_remap

description: Schedule function to be run after specified seconds without blocking.

Behind the scene, this method makes use of the ATS event model.

Here is an example:

function schedule()
    ts.debug('test schedule starts')
end

function cache_lookup()
    ts.debug('cache-lookup')
    ts.schedule(TS_LUA_THREAD_POOL_NET, 0, schedule)
    return 0
end

function do_remap()
    ts.hook(TS_LUA_HOOK_CACHE_LOOKUP_COMPLETE, cache_lookup)
end

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ts.http.config_int_get

syntax: val = ts.http.config_int_get(CONFIG)

context: do_remap/do_os_response or do_global_* or later

description: Configuration option which has a int value can be retrieved with this function.

val = ts.http.config_int_get(TS_LUA_CONFIG_HTTP_CACHE_HTTP)

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ts.http.config_int_set

syntax: ts.http.config_int_set(CONFIG, NUMBER)

context: do_remap/do_os_response or do_global_* or later

description: This function can be used to overwrite the configuration options.

Here is an example:

function do_remap()
    ts.http.config_int_set(TS_LUA_CONFIG_HTTP_CACHE_HTTP, 0)    -- bypass the cache processor
    return 0
end

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ts.http.config_float_get

syntax: val = ts.http.config_float_get(CONFIG)

context: do_remap/do_os_response or do_global_* or later

description: Configuration option which has a float value can be retrieved with this function.

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ts.http.config_float_set

syntax: ts.http.config_float_set(CONFIG, NUMBER)

context: do_remap/do_os_response or do_global_* or later

description: This function can be used to overwrite the configuration options.

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ts.http.config_string_get

syntax: val = ts.http.config_string_get(CONFIG)

context: do_remap/do_os_response or do_global_* or later

description: Configuration option which has a string value can be retrieved with this function.

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ts.http.config_string_set

syntax: ts.http.config_string_set(CONFIG, NUMBER)

context: do_remap/do_os_response or do_global_* or later

description: This function can be used to overwrite the configuration options.

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Http config constants

context: do_remap/do_os_response or do_global_* or later

TS_LUA_CONFIG_URL_REMAP_PRISTINE_HOST_HDR
TS_LUA_CONFIG_HTTP_CHUNKING_ENABLED
TS_LUA_CONFIG_HTTP_NEGATIVE_CACHING_ENABLED
TS_LUA_CONFIG_HTTP_NEGATIVE_CACHING_LIFETIME
TS_LUA_CONFIG_HTTP_CACHE_WHEN_TO_REVALIDATE
TS_LUA_CONFIG_HTTP_KEEP_ALIVE_ENABLED_IN
TS_LUA_CONFIG_HTTP_KEEP_ALIVE_ENABLED_OUT
TS_LUA_CONFIG_HTTP_KEEP_ALIVE_POST_OUT
TS_LUA_CONFIG_HTTP_SERVER_SESSION_SHARING_MATCH
TS_LUA_CONFIG_NET_SOCK_RECV_BUFFER_SIZE_OUT
TS_LUA_CONFIG_NET_SOCK_SEND_BUFFER_SIZE_OUT
TS_LUA_CONFIG_NET_SOCK_OPTION_FLAG_OUT
TS_LUA_CONFIG_HTTP_FORWARD_PROXY_AUTH_TO_PARENT
TS_LUA_CONFIG_HTTP_ANONYMIZE_REMOVE_FROM
TS_LUA_CONFIG_HTTP_ANONYMIZE_REMOVE_REFERER
TS_LUA_CONFIG_HTTP_ANONYMIZE_REMOVE_USER_AGENT
TS_LUA_CONFIG_HTTP_ANONYMIZE_REMOVE_COOKIE
TS_LUA_CONFIG_HTTP_ANONYMIZE_REMOVE_CLIENT_IP
TS_LUA_CONFIG_HTTP_ANONYMIZE_INSERT_CLIENT_IP
TS_LUA_CONFIG_HTTP_RESPONSE_SERVER_ENABLED
TS_LUA_CONFIG_HTTP_INSERT_SQUID_X_FORWARDED_FOR
TS_LUA_CONFIG_HTTP_SERVER_TCP_INIT_CWND
TS_LUA_CONFIG_HTTP_SEND_HTTP11_REQUESTS
TS_LUA_CONFIG_HTTP_CACHE_HTTP
TS_LUA_CONFIG_HTTP_CACHE_CLUSTER_CACHE_LOCAL
TS_LUA_CONFIG_HTTP_CACHE_IGNORE_CLIENT_NO_CACHE
TS_LUA_CONFIG_HTTP_CACHE_IGNORE_CLIENT_CC_MAX_AGE
TS_LUA_CONFIG_HTTP_CACHE_IMS_ON_CLIENT_NO_CACHE
TS_LUA_CONFIG_HTTP_CACHE_IGNORE_SERVER_NO_CACHE
TS_LUA_CONFIG_HTTP_CACHE_CACHE_RESPONSES_TO_COOKIES
TS_LUA_CONFIG_HTTP_CACHE_IGNORE_AUTHENTICATION
TS_LUA_CONFIG_HTTP_CACHE_CACHE_URLS_THAT_LOOK_DYNAMIC
TS_LUA_CONFIG_HTTP_CACHE_REQUIRED_HEADERS
TS_LUA_CONFIG_HTTP_INSERT_REQUEST_VIA_STR
TS_LUA_CONFIG_HTTP_INSERT_RESPONSE_VIA_STR
TS_LUA_CONFIG_HTTP_CACHE_HEURISTIC_MIN_LIFETIME
TS_LUA_CONFIG_HTTP_CACHE_HEURISTIC_MAX_LIFETIME
TS_LUA_CONFIG_HTTP_CACHE_GUARANTEED_MIN_LIFETIME
TS_LUA_CONFIG_HTTP_CACHE_GUARANTEED_MAX_LIFETIME
TS_LUA_CONFIG_HTTP_CACHE_MAX_STALE_AGE
TS_LUA_CONFIG_HTTP_KEEP_ALIVE_NO_ACTIVITY_TIMEOUT_IN
TS_LUA_CONFIG_HTTP_KEEP_ALIVE_NO_ACTIVITY_TIMEOUT_OUT
TS_LUA_CONFIG_HTTP_TRANSACTION_NO_ACTIVITY_TIMEOUT_IN
TS_LUA_CONFIG_HTTP_TRANSACTION_NO_ACTIVITY_TIMEOUT_OUT
TS_LUA_CONFIG_HTTP_TRANSACTION_ACTIVE_TIMEOUT_OUT
TS_LUA_CONFIG_HTTP_ORIGIN_MAX_CONNECTIONS
TS_LUA_CONFIG_HTTP_CONNECT_ATTEMPTS_MAX_RETRIES
TS_LUA_CONFIG_HTTP_CONNECT_ATTEMPTS_MAX_RETRIES_DEAD_SERVER
TS_LUA_CONFIG_HTTP_CONNECT_ATTEMPTS_RR_RETRIES
TS_LUA_CONFIG_HTTP_CONNECT_ATTEMPTS_TIMEOUT
TS_LUA_CONFIG_HTTP_POST_CONNECT_ATTEMPTS_TIMEOUT
TS_LUA_CONFIG_HTTP_DOWN_SERVER_CACHE_TIME
TS_LUA_CONFIG_HTTP_DOWN_SERVER_ABORT_THRESHOLD
TS_LUA_CONFIG_HTTP_CACHE_FUZZ_TIME
TS_LUA_CONFIG_HTTP_CACHE_FUZZ_MIN_TIME
TS_LUA_CONFIG_HTTP_DOC_IN_CACHE_SKIP_DNS
TS_LUA_CONFIG_HTTP_BACKGROUND_FILL_ACTIVE_TIMEOUT
TS_LUA_CONFIG_HTTP_RESPONSE_SERVER_STR
TS_LUA_CONFIG_HTTP_CACHE_HEURISTIC_LM_FACTOR
TS_LUA_CONFIG_HTTP_CACHE_FUZZ_PROBABILITY
TS_LUA_CONFIG_HTTP_BACKGROUND_FILL_COMPLETED_THRESHOLD
TS_LUA_CONFIG_NET_SOCK_PACKET_MARK_OUT
TS_LUA_CONFIG_NET_SOCK_PACKET_TOS_OUT
TS_LUA_CONFIG_HTTP_INSERT_AGE_IN_RESPONSE
TS_LUA_CONFIG_HTTP_CHUNKING_SIZE
TS_LUA_CONFIG_HTTP_FLOW_CONTROL_ENABLED
TS_LUA_CONFIG_HTTP_FLOW_CONTROL_LOW_WATER_MARK
TS_LUA_CONFIG_HTTP_FLOW_CONTROL_HIGH_WATER_MARK
TS_LUA_CONFIG_HTTP_CACHE_RANGE_LOOKUP
TS_LUA_CONFIG_HTTP_NORMALIZE_AE_GZIP
TS_LUA_CONFIG_HTTP_DEFAULT_BUFFER_SIZE
TS_LUA_CONFIG_HTTP_DEFAULT_BUFFER_WATER_MARK
TS_LUA_CONFIG_HTTP_REQUEST_HEADER_MAX_SIZE
TS_LUA_CONFIG_HTTP_RESPONSE_HEADER_MAX_SIZE
TS_LUA_CONFIG_HTTP_NEGATIVE_REVALIDATING_ENABLED
TS_LUA_CONFIG_HTTP_NEGATIVE_REVALIDATING_LIFETIME
TS_LUA_CONFIG_SSL_HSTS_MAX_AGE
TS_LUA_CONFIG_SSL_HSTS_INCLUDE_SUBDOMAINS
TS_LUA_CONFIG_HTTP_CACHE_OPEN_READ_RETRY_TIME
TS_LUA_CONFIG_HTTP_CACHE_MAX_OPEN_READ_RETRIES
TS_LUA_CONFIG_HTTP_CACHE_RANGE_WRITE
TS_LUA_CONFIG_HTTP_POST_CHECK_CONTENT_LENGTH_ENABLED
TS_LUA_CONFIG_HTTP_GLOBAL_USER_AGENT_HEADER
TS_LUA_CONFIG_HTTP_AUTH_SERVER_SESSION_PRIVATE
TS_LUA_CONFIG_HTTP_SLOW_LOG_THRESHOLD
TS_LUA_CONFIG_HTTP_CACHE_GENERATION
TS_LUA_CONFIG_BODY_FACTORY_TEMPLATE_BASE
TS_LUA_CONFIG_HTTP_CACHE_OPEN_WRITE_FAIL_ACTION
TS_LUA_CONFIG_HTTP_NUMBER_OF_REDIRECTIONS
TS_LUA_CONFIG_HTTP_CACHE_MAX_OPEN_WRITE_RETRIES
TS_LUA_CONFIG_LAST_ENTRY

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ts.http.timeout_set

syntax: ts.http.timeout_set(CONFIG, NUMBER)

context: do_remap/do_os_response or do_global_* or later.

description: This function can be used to overwrite the timeout settings.

Here is an example:

function do_remap()
    ts.http.timeout_set(TS_LUA_TIMEOUT_DNS, 30)    -- 30 seconds
    return 0
end

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Timeout constants

context: do_remap/do_os_response or do_global_* or later

TS_LUA_TIMEOUT_ACTIVE
TS_LUA_TIMEOUT_DNS
TS_LUA_TIMEOUT_CONNECT
TS_LUA_TIMEOUT_NO_ACTIVITY

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ts.http.client_packet_mark_set

syntax: ts.http.client_packet_mark_set(NUMBER)

context: do_remap/do_os_response or do_global_* or later.

description: This function can be used to set packet mark for client connection.

Here is an example:

function do_remap()
    ts.http.client_packet_mark_set(0)
    return 0
end

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ts.http.server_packet_mark_set

syntax: ts.http.server_packet_mark_set(NUMBER)

context: do_remap/do_os_response or do_global_* or later.

description: This function can be used to set packet mark for server connection.

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ts.http.client_packet_tos_set

syntax: ts.http.client_packet_tos_set(NUMBER)

context: do_remap/do_os_response or do_global_* or later.

description: This function can be used to set packet tos for client connection.

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ts.http.server_packet_tos_set

syntax: ts.http.server_packet_tos_set(NUMBER)

context: do_remap/do_os_response or do_global_* or later.

description: This function can be used to set packet tos for server connection.

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ts.http.client_packet_dscp_set

syntax: ts.http.client_packet_dscp_set(NUMBER)

context: do_remap/do_os_response or do_global_* or later.

description: This function can be used to set packet dscp for client connection.

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ts.http.server_packet_dscp_set

syntax: ts.http.server_packet_dscp_set(NUMBER)

context: do_remap/do_os_response or do_global_* or later.

description: This function can be used to set packet dscp for server connection.

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ts.http.enable_redirect

syntax: ts.http.enable_redirect(NUMBER)

context: do_remap/do_os_response or do_global_* or later.

decription: This function can be used to make transaction follow redirect

Here is an example:

function do_remap()
    ts.http.enable_redirect(1)
    return 0
end

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ts.http.set_debug

syntax: ts.http.set_debug(NUMBER)

context: do_remap/do_os_response or do_global_* or later.

decription: This function can be used to enable debug log for the transaction

Here is an example:

function do_remap()
    ts.http.set_debug(1)
    return 0
end

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ts.http.cntl_get

syntax: val = ts.http.cntl_get(CNTL_TYPE)

context: do_remap/do_os_response or do_global_* or later.

description: This function can be used to retireve the value of control channel.

val = ts.http.cntl_get(TS_LUA_HTTP_CNTL_GET_LOGGING_MODE)

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ts.http.cntl_set

syntax: ts.http.cntl_set(CNTL_TYPE, BOOL)

context: do_remap/do_os_response or do_global_* or later.

description: This function can be used to set the value of control channel.

Here is an example:

function do_remap()
    ts.http.cntl_set(TS_LUA_HTTP_CNTL_SET_LOGGING_MODE, 0)      -- do not log the request
    return 0
end

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Http control channel constants

context: do_remap/do_os_response or do_global_* or later

TS_LUA_HTTP_CNTL_GET_LOGGING_MODE
TS_LUA_HTTP_CNTL_SET_LOGGING_MODE
TS_LUA_HTTP_CNTL_GET_INTERCEPT_RETRY_MODE
TS_LUA_HTTP_CNTL_SET_INTERCEPT_RETRY_MODE

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ts.http.milestone_get

syntax: val = ts.http.milestone_get(MILESTONE_TYPE)

context: do_remap/do_os_response or do_global_* or later.

description: This function can be used to retireve the various milestone times. They are how long the transaction took to traverse portions of the HTTP state machine. Each milestone value is a fractional number of seconds since the beginning of the transaction.

val = ts.http.milestone_get(TS_LUA_MILESTONE_SM_START)

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Milestone constants

context: do_remap/do_os_response or do_global_* or later

TS_LUA_MILESTONE_UA_BEGIN
TS_LUA_MILESTONE_UA_FIRST_READ
TS_LUA_MILESTONE_UA_READ_HEADER_DONE
TS_LUA_MILESTONE_UA_BEGIN_WRITE
TS_LUA_MILESTONE_UA_CLOSE
TS_LUA_MILESTONE_SERVER_FIRST_CONNECT
TS_LUA_MILESTONE_SERVER_CONNECT
TS_LUA_MILESTONE_SERVER_CONNECT_END
TS_LUA_MILESTONE_SERVER_BEGIN_WRITE
TS_LUA_MILESTONE_SERVER_FIRST_READ
TS_LUA_MILESTONE_SERVER_READ_HEADER_DONE
TS_LUA_MILESTONE_SERVER_CLOSE
TS_LUA_MILESTONE_CACHE_OPEN_READ_BEGIN
TS_LUA_MILESTONE_CACHE_OPEN_READ_END
TS_LUA_MILESTONE_CACHE_OPEN_WRITE_BEGIN
TS_LUA_MILESTONE_CACHE_OPEN_WRITE_END
TS_LUA_MILESTONE_DNS_LOOKUP_BEGIN
TS_LUA_MILESTONE_DNS_LOOKUP_END
TS_LUA_MILESTONE_SM_START
TS_LUA_MILESTONE_SM_FINISH
TS_LUA_MILESTONE_PLUGIN_ACTIVE
TS_LUA_MILESTONE_PLUGIN_TOTAL

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ts.mgmt.get_counter

syntax: val = ts.mgmt.get_counter(RECORD_NAME)

context: do_remap/do_os_response or do_global_* or later.

description: This function can be used to retrieve the record value which has a counter type.

n = ts.mgmt.get_counter('proxy.process.http.incoming_requests')

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ts.mgmt.get_int

syntax: val = ts.mgmt.get_int(RECORD_NAME)

context: do_remap/do_os_response or do_global_* or later.

description: This function can be used to retrieve the record value which has a int type.

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ts.mgmt.get_float

syntax: val = ts.mgmt.get_float(RECORD_NAME)

context: do_remap/do_os_response or do_global_* or later.

description: This function can be used to retrieve the record value which has a float type.

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ts.mgmt.get_string

syntax: val = ts.mgmt.get_string(RECORD_NAME)

context: do_remap/do_os_response or do_global_* or later.

description: This function can be used to retrieve the record value which has a string type.

name = ts.mgmt.get_string('proxy.config.product_name')

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ts.stat_create

syntax: val = ts.stat_create(STAT_NAME, RECORDDATA_TYPE, PERSISTENT, SYNC)

context: global

description: This function can be used to create a statistics record given the name, data type, persistent requirement, and sync requirement. A statistics record table will be created with 4 functions to increment, decrement, get and set the value.

stat:increment(value)
stat:decrement(value)
v = stat:get_value()
stat:set_value(value)

Here is an example.

local test_stat;

function __init__(args)
    test_stat = ts.stat_create("test_stat",
      TS_LUA_RECORDDATATYPE_INT,
      TS_LUA_STAT_PERSISTENT,
      TS_LUA_STAT_SYNC_COUNT)
end

function do_global_read_request()
    local value = test_stat:get_value()
    ts.debug(value)
    test_stat:increment(1)
    return 0
end

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ts.stat_find

syntax: val = ts.stat_create(STAT_NAME)

context: global

description: This function can be used to find a statistics record given the name. A statistics record table will be returned with 4 functions to increment, decrement, get and set the value. That is similar to ts.stat_create()

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Todo

  • ts.cache_xxx
  • protocol

Currently when we use ts_lua as a global plugin, each global hook is using a separate lua state for the same transaction. This can be wasteful. Also the state cannot be reused for the same transaction across the global hooks. The alternative will be to use a TXN_START hook to create a lua state first and then add each global hook in the lua script as transaction hook instead. But this will have problem down the road when we need to have multiple plugins to work together in some proper orderings. In the future, we should consider different approach, such as creating and maintaining the lua state in the ATS core.

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Notes on Unit Testing Lua scripts for ATS Lua Plugin

Follow the steps below to use busted framework to run some unit tests on sample scripts and modules

  • Build and install lua 5.1.5 using the source code from here - http://www.lua.org/ftp/lua-5.1.tar.gz
  • Build and install luarocks 2.2.2 from here - https://github.com/keplerproject/luarocks/wiki/Download
  • Run “sudo luarocks install busted”
  • Run “sudo luarocks install luacov”
  • “cd trafficserver/plugins/experimental/ts_lua/ci”
  • Run “busted -c module_test.lua; luacov”. It will produce “luacov.report.out” containing the code coverage for “module.lua”
  • Run “busted -c script_test.lua; luacov”. It will produce “luacov.report.out” containing the code coverage for “script.lua”

Reference for further information

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