Name

ngx_tcp_module - A tcp stream module for nginx.

ngx_tcp_lua_module - Embed the power of Lua into Nginx Servers. Work under tcp stream mode.

This module is not distributed with the Nginx source. See the installation instructions.

Name
Status
Version
Config example
Description
Directives
Code Exapmle for ngx_tcp_lua_module
Nginx API for Lua

Status

Production ready. This markdwon is in progress...

Version

This document describes nginx tcp module v0.2.

Installation

Download the nginx-1.4.1 HERE
unzip, cd nginx-1.4.1, copy auto.patch,src_core.patch,src_http.patch into current directory
patch -p1 < auto.patch
patch -p1 < src_core.patch patch -p1 < src_http.patch #optional, for nginx access_nlog
copy tcp/ into current src/
then, ./configure and make and make isntall. here is configure example

    # yum -y install  -y pcre* openssl*
    # for pcre, such as ngx.gmatch etc, --with-pcre=PATH/pcre-8.36 --with-pcre-jit
    # if use openssl, then need --with-http_ssl_module
    #
    export LUAJIT_LIB=/usr/local/lib
    export LUAJIT_INC=/usr/local/include/luajit-2.0
    ./configure --prefix=/usr/local/nginx_tcp \
			--with-debug \
			--with-pcre=/root/ngx_tcp_compile/softwares/pcre-8.36 \
			--with-pcre-jit \
			--without-http_gzip_module \
			--with-http_stub_status_module \
			--with-http_ssl_module \
			--with-tcp \
			--with-tcp_ssl_module \
			--with-openssl=/opt/openssl-1.0.1e \
			--with-openssl-opt=-g \
			--add-module=src/tcp/ngx_tcp_log_module \
			--add-module=src/tcp/ngx_tcp_demo_module \
			--add-module=src/tcp/ngx_tcp_lua_module

Build the source with ngx_tcp_lua_module:

    wget http://luajit.org/download/LuaJIT-2.0.0.tar.gz
    tar -xvfz LuaJIT-2.0.0.tar.gz
    cd LuaJIT-2.0.0
    make &&  make install

    # tell nginx's build system where to find luajit:
    export LUAJIT_LIB=/usr/local/lib
    export LUAJIT_INC=/usr/local/include/luajit-2.0

    # or tell where to find Lua
    #export LUA_LIB=/path/to/lua/lib
    #export LUA_INC=/path/to/lua/include

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Config example

nginx tcp core module, for tcp stream server

    tcp {
        #connection_pool_size 1k;   #main/srv/take one/default 0.5k
        session_pool_size 1k;  #main/srv/take one/default 1k
        client_max_body_size 1k;   #main/srv/take one/default 1k;

        read_timeout 60s;    #main/srv/take one/default 60s
        #send_timeout 60s;    #main/srv/take one/default 60s
        #keepalive_timeout 60; #main/srv/take one/no set,no keepalive_timeout 

        #error_log  logs/error_tcp.log debug_tcp;  #main/srv/take one more/default null
        error_log logs/error_tcp.log info;

        log_format token '$remote_addr $time_iso8601 $msec $request_time $connection $connection_requests $bytes_sent $protocol';
        #default log_format combined '$remote_addr $time_iso8601 $msec $request_time $connection $connection_requests $protocol';

        server {
            listen 6666;

            protocol demo;

            #access_log off;
            access_log logs/access_tcp.log token;  #default access_log logs/access_tcp.log;
            access_nlog 0.0.0.0:5002 0.0.0.0:5151;

            allow 127.0.0.1;
            deny all;
        }
        
        #server {
        #    listen 6433;
        #
        #    protocol demo;
        #
        #    #access_log off;
        #    access_log logs/access_tcp.log demo;  #default access_log logs/access_tcp.log;
        #    access_nlog 0.0.0.0:5002 0.0.0.0:5151;
        #
        #    ssl                  on;
        #    ssl_certificate      xxx-chain.pem;
        #    ssl_certificate_key  xxx-key.pem;
        #    ssl_session_timeout  5m;
        #    ssl_protocols  SSLv2 SSLv3 TLSv1;
        #    ssl_ciphers  HIGH:!aNULL:!MD5;
        #    ssl_prefer_server_ciphers   on;
        #}
    
    }

for lua module

    tcp {
        lua_package_path '/usr/local/nginx_tcp/conf/?.lua;/usr/local/nginx_tcp/conf/lua_module/?.lua;;';
        lua_package_cpath '/usr/local/nginx_tcp/conf/lua_module/?.so;;';

        lua_shared_dict db_lock 100m;

        init_by_lua_file 'conf/init_by_lua.lua';

        server {
            listen 6666;
            
            protocol tcp_lua;
            process_by_lua_file 'conf/test.lua';
    }

and for the test.lua, see example Code Exapmle for ngx_tcp_lua_module

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Description

Based on nginx-1.4.1, refer to nginx-http-lua, follow the principles of simple, efficient and highly extensible, the nginx-tcp module is designed as a customized stream protocol server, more than http, mail server. And the ngx_tcp_lua module is very useful in fast implement your own service.

Patch log.c, ngx_http_log_module.c, add the command nlog,access_nlog to send error_log,access_log to log server with udp.
tcp_module for customized stream protocol on tcp, support ssl. example, tcp/ngx_tcp_demo_module.
tcp_lua module: embeds Lua code, 100% non-blocking on network traffic.
- just like ngx_tcp_demo_module, ngx_tcp_lua module is a special module on tcp_module.
- enriched the functions such as init_by_lua,ngx.sleep,ngx.exit, just like nginx-lua-module
- lua lib with cosocket to deal with mysql,http server. simple load banlance and retry also supported
- support ngx.nlog to send log to udp log server, more than ngx.log to local file.
- support ssl cosocket with upstream
About installation, APIs, and examples, see tcp/doc/ for more details

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Directives

listen

syntax: listen [ip:]port [backlog=number] [rcvbuf=size] [sndbuf=size] [deferred] [bind] [ssl] [so_keepalive=on|off|[keepidle]:[keepintvl]:[keepcnt]];

default: listen *:0;

context: server

example:

    listen 127.0.0.1:110;
    listen *:110;
    listen 110;     # same as *:110

Sets the address and port for IP on which the server will accept requests. Only IPv4 supported now.

One server{} can have diffrent ip addresses. But one specified port only can be set in one server{}.

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protocol

syntax: protocol protocol_name;

default: -;

context: server

example:

    protocol demo;

protocol_name must be defined in an implemented module, such as ngx_tcp_demo_module. One server{} can only have one specified protocol_name.

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read_timeout

syntax: read_timeout time;

default: 60s;

context: tcp,server

example:

read_timeout 60s;

Sets the timeout for read the whole protocol data.

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send_timeout

syntax: send_timeout time;

default: 60s;

context: tcp,server

example:

send_timeout 60s;

Sets a timeout for transmitting a response to the client. The timeout is set only between two successive write operations, not for the transmission of the whole response. If the client does not receive anything within this time, the connection is closed.

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keepalive_timeout

syntax: keepalive_timeout time;

default: 6000s;

context: tcp,server

example:

send_timeout 6000s;

Sets a timeout during which a keep-alive client connection will stay open on the server side. The zero value disables keep-alive client connections. (TODO: enable never close client connection)

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connection_pool_size

syntax: connection_pool_size size;

default: 0.5k;

context: tcp,server

example:

connection_pool_size 1k;

Allows accurate tuning of per-connection memory allocations. This directive has minimal impact on performance and should not generally be used.

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session_pool_size

syntax: session_pool_size size;

default: 1k;

context: tcp,server

example:

session_pool_size 1k;

Allows accurate tuning of per-session memory allocations. This directive has minimal impact on performance and should not generally be used. The optimal value is little larger than average receiving data length, so it can take full use of memory and minimum times of allocations.

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client_max_body_size

syntax: client_max_body_size size;

default: 1k;

context: tcp,server

example:

client_max_body_size 1k;

Sets the maximum allowed size of the client request body, specified by protocol.

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error_log

default: error_log logs/error.log error;

context: main,tcp,server

example:

error_log logs/error.log error;
#or in tcp{},server{} below: 
error_log logs/error_tcp.log debug_tcp;

Configures logging. 'debug_tcp' can be used like 'debug_http'.

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nlog

syntax: nlog local_ip:local_port remote_ip:remote_prot;

default: -;

context: main,tcp,server

example:

error_log logs/error.log error;
nlog 0.0.0.0:5001 0.0.0.0:5151; #nlog must set after error_log.

Configures ip address to support logging to UDP log server.

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allow

syntax: allow ip | all;

default: -;

context: tcp,server

example:

allow 127.0.0.1;
allow 127.0.0.0/24;
allow all;

Allows access for the specified network or address. The rules are checked in sequence until the first match is found.

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deny

syntax: deny ip | all;

default: -;

context: tcp,server

example:

deny 127.0.0.1;
deny 127.0.0.0/24;
deny all;

Denies access for the specified network or address. The rules are checked in sequence until the first match is found.

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resolver

syntax: resolver address [valid=time];

default: -;

context: tcp,server

example:

resolver 127.0.0.1 8.8.8.8 valid=30s;;

Configures name servers used to resolve names of upstream servers into addresses. By default, nginx caches answers using the TTL value of a response. An optional valid parameter allows overriding it.

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resolver_timeout

syntax: resolver time;

default: 30s;

context: tcp,server

example:

resolver_timeout 10s;

Sets a timeout for name resolution.

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log_format

syntax: log_format name string ...;

default: combined '$remote_addr $time_iso8601 $msec $request_time $connection $connection_requests $protocol';

context: tcp,server

example:

log_format log1 '$remote_addr $time_iso8601 $msec $request_time $connection $connection_requests $bytes_sent $protocol';

Specifies log format.

The log format can contain common variables, and variables that exist only at the time of a log write:

$remote_addr

client ip address.

$time_local

local time in the Common Log Format, "28/Sep/1970:12:00:00 +0600".

$time_iso8601

local time in the ISO 8601 standard format, "1970-09-28T12:00:00+06:00".

$msec

time in seconds with a milliseconds resolution at the time of the log write.

$request_time

request processing time in seconds with a milliseconds resolution; time elapsed between the first bytes were read from the client and the log write after the last bytes were sent to the client.

$connection

connection serial number.

$connection_requests

the current number of requests made through a connection.

$bytes_sent

the number of bytes sent to a client.

$protocol

the current protocol name.

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access_log

syntax: access_log path | off [format];

default: logs/access_tcp.log combined;

context: tcp,server

example:

access_log logs/access_tcp.log log1;

Sets the path, format for a buffered log write. Several logs can be specified on the same level.

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access_nlog

syntax: access_nlog local_ip:local_port remote_ip:remote_prot;

default: -;

context: tcp,server

example:

access_log logs/access_tcp.log log1;
access_nlog 127.0.0.1:5002 127.0.0.1:5151;#access_nlog must set after access_log.

Configures ip address to support logging to UDP log server.

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ssl

refer to http://nginx.org/en/docs/http/ngx_http_ssl_module.html

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ssl_certificate

refer to http://nginx.org/en/docs/http/ngx_http_ssl_module.html

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ssl_certificate_key

refer to http://nginx.org/en/docs/http/ngx_http_ssl_module.html

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ssl_dhparam

refer to http://nginx.org/en/docs/http/ngx_http_ssl_module.html

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ssl_ecdh_curve

refer to http://nginx.org/en/docs/http/ngx_http_ssl_module.html

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ssl_protocols

refer to http://nginx.org/en/docs/http/ngx_http_ssl_module.html

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ssl_ciphers

refer to http://nginx.org/en/docs/http/ngx_http_ssl_module.html

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ssl_verify_client

refer to http://nginx.org/en/docs/http/ngx_http_ssl_module.html

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ssl_verify_depth

refer to http://nginx.org/en/docs/http/ngx_http_ssl_module.html

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ssl_client_certificate

refer to http://nginx.org/en/docs/http/ngx_http_ssl_module.html

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ssl_prefer_server_ciphers

refer to http://nginx.org/en/docs/http/ngx_http_ssl_module.html

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ssl_session_cache

refer to http://nginx.org/en/docs/http/ngx_http_ssl_module.html

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ssl_session_timeout

refer to http://nginx.org/en/docs/http/ngx_http_ssl_module.html

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ssl_crl

refer to http://nginx.org/en/docs/http/ngx_http_ssl_module.html

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lua_package_cpath

syntax: lua_package_cpath lua-style-cpath-str;

default: The content of LUA_CPATH environment variable or Lua's compiled-in defaults.;

context: tcp

example:

lua_package_cpath '/bar/baz/?.so;/blah/blah/?.so;;';

Sets the Lua C-module search path used by scripts specified by init_by_lua[_file], protocol_by_lua[_file]. The cpath string is in standard Lua cpath form, and ;; can be used to stand for the original cpath.

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lua_package_path

syntax: lua_package_path lua-style-path-str;

default: The content of LUA_PATH environ variable or Lua's compiled-in defaults.

context: tcp

example:

lua_package_path '/foo/bar/?.lua;/blah/?.lua;;'

Sets the Lua module search path used by scripts specified by init_by_lua[_file], protocol_by_lua[_file]. The path string is in standard Lua path form, and ;; can be used to stand for the original search paths.

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lua_code_cache

syntax: lua_code_cache on | off;

default: The content of LUA_PATH environ variable or Lua's compiled-in defaults.

context: tcp,server

example:

lua_code_cache on;

Enables or disables the Lua code cache for Lua code in *_by_lua_file directives and Lua modules.

When turning off, every request served by ngx_lua will run in a separate Lua VM instance.

Disabling the Lua code cache is strongly discouraged for production use and should only be used during development as it has a significant negative impact on overall performance.

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init_by_lua

syntax: init_by_lua lua-script-str;

default: -

context: tcp

example:

init_by_lua 'a = require("a")';

Runs the Lua code specified by the argument on the global Lua VM level when the Nginx master process (if any) is loading the Nginx config file.

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init_by_lua_file

syntax: init_by_lua_file path-to-lua-script-file;

default: -

context: tcp

example:

init_by_lua_file 'conf/init_by_lua.lua';

Equivalent to init_by_lua, except that the file specified by contains the Lua code or Lua/LuaJIT bytecode to be executed.

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process_by_lua

syntax: process_by_lua lua-script-str;

default: -

context: server

example:

process_by_lua 'ngx.exit()';

Executes Lua code string specified in for requests of every connection. The Lua code may make API calls and is executed as a new spawned coroutine in an independent global environment (i.e. a sandbox).

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process_by_lua_file

syntax: process_by_lua_file path-to-lua-script-file;

default: -

context: server

example:

process_by_lua_file 'conf/test.lua';

Equivalent to process_by_lua, except that the file specified by contains the Lua code or Lua/LuaJIT bytecode to be executed.

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lua_socket_connect_timeout

syntax: lua_socket_connect_timeout time;

default: 60s;

context: tcp,server

example:

lua_socket_connect_timeout 5;

This directive controls the default timeout value used in tcp socket object's connect method and can be overridden by the settimeout method.

The argument can be an integer, with an optional time unit, like s (second), ms (millisecond), m (minute). The default time unit is s, i.e., "second". The default setting is 60s.

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lua_socket_send_lowat

syntax: lua_socket_send_lowat size;

default: 0;

context: tcp,server

example:

lua_socket_send_lowat 0;

Controls the lowat (low water) value for the cosocket send buffer.

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lua_socket_pool_size

syntax: lua_socket_pool_size size;

default: 30;

context: tcp,server

example:

lua_socket_pool_size 10;

Specifies the size limit (in terms of connection count) for every cosocket connection pool associated with every remote server (i.e., identified by either the host-port pair).

When the connection pool exceeds the available size limit, the least recently used (idle) connection already in the pool will be closed to make room for the current connection.

Note that the cosocket connection pool is per nginx worker process rather than per nginx server instance, so size limit specified here also applies to every single nginx worker process.

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lua_check_client_abort

syntax: lua_check_client_abort on|off;

default: off;

context: tcp,server

example:

lua_check_client_abort on;

This directive controls whether to check for premature client connection abortion.

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lua_shared_dict

syntax: lua_shared_dict name size;

default: -;

context: tcp

example:

lua_shared_dict dogs 10m;

Declares a shared memory zone, , to serve as storage for the shm based Lua dictionary ngx.shared..

Shared memory zones are always shared by all the nginx worker processes in the current nginx server instance.

The argument accepts size units such as k and m. At least 8k;

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lua_shared_dict

syntax: lua_regex_cache_max_entries num;

default: 1024;

context: tcp

example:

lua_shared_dict dogs 10m;

Specifies the maximum number of entries allowed in the worker process level compiled regex cache.

The regular expressions used in ngx.re.match, ngx.re.gmatch, ngx.re.sub, and ngx.re.gsub will be cached within this cache if the regex option o (i.e., compile-once flag) is specified.

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lua_regex_match_limit

syntax: lua_regex_match_limit num;

default: 0;

context: tcp

example:

lua_shared_dict dogs 10m;

Specifies the "match limit" used by the PCRE library when executing the ngx.re API. To quote the PCRE manpage, "the limit ... has the effect of limiting the amount of backtracking that can take place."

When the limit is hit, the error string "pcre_exec() failed: -8" will be returned by the ngx.re API functions on the Lua land.

When setting the limit to 0, the default "match limit" when compiling the PCRE library is used. And this is the default value of this directive.

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demo_echo

syntax: demo_echo str;

default: -;

context: server

example:

demo_echo "hello world";

This directive is used for ngx_tcp_demo_module, which define a echo protocol. The request stream is 4 bytes head contains request data length. When demo_echo string set, the server will response 4 bytes head contains response data length, and demo_echo string. when this directive not set, the response body data is request body data.

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Code Exapmle for ngx_tcp_lua_module

    local client_sock = ngx.socket.tcp()
    client_sock:settimeout(5000,1000,3000)

    local data = "hello world 1234567890"
    local data_len = string.len(data)
    local data_len_h = netutil.htonl(data_len)
    local req_data = netutil.packint32(data_len_h) .. data


    local upstream_test = function(u)
        local ret,err = u:connect("127.0.0.1",8000,"127.0.0.1_8000_1");
        local reuse = u:getreusedtimes()
        ngx.log(ngx.INFO,"connect : "..tostring(ret).." "..tostring(err).." "..tostring(reuse))
        if not ret then 
             return
        end

        ret,err = u:send(req_data)
        ngx.log(ngx.INFO,"send : "..tostring(ret).." "..tostring(err))
        if not ret then
            return
        end

        local data,err = u:receive(4,nil)
        if use_log then ngx.log(ngx.INFO,"receive : "..tostring(data).." "..tostring(err)) end
        if not data then
            return
        end

        local totoal_len = netutil.unpackint32(string.sub(data,1,4))
        ngx.log(ngx.INFO,"totoal_len : "..tostring(totoal_len))

        local data,err = u:receive(totoal_len - 4,nil)
        ngx.log(ngx.INFO,"receive again: ["..tostring(data).."] "..tostring(err))
        if not data then
             return
        end

        if totoal_len - 4 ~= #data then
             ngx.log(ngx.INFO,"receive len not match")
             return
        end
        u:setkeepalive()
    end


    local test_shm = function()
         local key = "x"
         local value = "hello world"
         local dogs = ngx.shared.db_lock
         local shm_value = dogs:get(key)

         if not shm_value then
             local succ, err, forcible = dogs:set(key,value,10000)
             ngx.log(ngx.INFO,tostring(succ)..","..tostring(err)..","..tostring(forcible))
         end

         local shm_value = dogs:get(key)
         ngx.log(ngx.INFO,tostring(shm_value))
    end


    while true do
         local data,r2,r3 = ngx.receive(10,6)

         ngx.say("receive ret "..tostring(data).." "..tostring(r2).." "..tostring(r3) .. ","..collectgarbage("count"))
         if not data then
              ngx.say("exit")
              ngx.exit()
         end

       --ngx.sleep(5)

       --upstream_test(client_sock)

       test_shm()

       --collectgarbage()

        ngx.wait_next_request()
    end

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Nginx API for Lua

Introduction
ngx.say
ngx.print
ngx.receive
ngx.wait_next_request
ngx.exit
ngx.sleep
ngx.utctime
ngx.localtime
ngx.time
ngx.now
ngx.today
ngx.tcp_time
ngx.parse_tcp_time
ngx.update_time
ngx.start_time
ngx.socket.tcp
tcpsock:connect
tcpsock:sslhandshake
tcpsock:receive
tcpsock:receive_http
tcpsock:send
tcpsock:close
tcpsock:setoption
tcpsock:settimeout
tcpsock:getreusedtimes
tcpsock:setkeepalive
ngx.socket.udp
udpsock:setpeername
udpsock:send
udpsock:receive
udpsock:settimeout
udpsock:close
ngx.new_ssl_ctx
Nginx log level constants
ngx.log
ngx.print
ngx.nlog
nlog:send
ngx.re.find
ngx.re.match
ngx.re.gmatch
ngx.re.sub
ngx.re.gsub
ngx.decode_base64
ngx.encode_base64
ngx.md5_bin
ngx.md5
ngx.sha1_bin
ngx.crc32_short
ngx.crc32_long
ngx.hmac_sha1
ngx.escape_uri
ngx.quote_sql_str
ngx.shared.DICT
ngx.shared.DICT.get
ngx.shared.DICT.get_stale
ngx.shared.DICT.set
ngx.shared.DICT.safe_set
ngx.shared.DICT.add
ngx.shared.DICT.safe_add
ngx.shared.DICT.replace
ngx.shared.DICT.delete
ngx.shared.DICT.incr
ngx.shared.DICT.flush_all
ngx.shared.DICT.flush_expired
ngx.shared.DICT.get_keys

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Introduction

The Nginx Lua API described below can only be called within the user Lua code run in the context of these configuration directives.

The API is exposed to Lua in the form of two standard packages ngx and ndk. These packages are in the default global scope within ngx_lua and are always available within ngx_lua directives.

Any way, lua exception will be thrown when something internal error occurs in APIs. Here are some common reason: out of memory, api calls in wrong context('no session found'), wrong arguments('expecting 1 or 2 arguments', 'expecting number parameter!', 'bad argument <= 0' etc).

ngx.say

syntax: send_bytes, err = ngx.say(...)

context: process_by_lua*

Just as ngx.print but also emit a trailing newline.

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ngx.print

syntax: send_bytes, err = ngx.print(...)

context: process_by_lua*

arguments:

one or more lua variables inclue table, string, nil, number, boolean and `ngx.null`. table is array table incule other variable types.

returns: send_bytes, err possiable values:

nil, "closed"            #failed, invalid socket, or client closed.
nil, "will send nothing" #failed, nothing to send
nil, "EAGAIN error"      #failed, network errors.
*number*, nil            #success, *number* is send bytes.

example:

local send_bytes, err = ngx.print("hello world",21,nil,true,false,{"a","b"})   
--output: hello world21niltruefalseab

Emits arguments concatenated to the client as response body.

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ngx.receive

syntax: data, err, partial = ngx.receive(totoal-size, at-least-size)

context: process_by_lua*

arguments:

totoal-size :  positive integer, bytes expected receive.
at-least-size : positive integer between(include) 1 and totoal-size.

returns: data, err, partial possiable values:

nil, error string, partial received data  #failed, read timedout, network errors, client closed etc.

string, nil, nil #success

example:

Receives data from the client socket according to the reading pattern or size.

This method is a synchronous operation and is 100% onblocking.

at-least-size is designed to parse uncertain length protocol, such as read a line.

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ngx.wait_next_request

syntax: ngx.wait_next_request()

context: process_by_lua*

arguments: [no]

returns: [no]

example:

while true do
	--process request
	--...
	ngx.wait_next_request()
end

This method separate each request in one connection, reset read/write buffer, set connection into idle state. This method is a synchronous operation and is 100% nonblocking. It will return in a new request arrival, or exit lua code when keepalive timedout.

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ngx.exit

syntax: ngx.exit()

context: process_by_lua*

arguments: [no]

returns: [no]

example:

This method will exit from lua code, and close current client connection.

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ngx.sleep

syntax: ngx.sleep(time-of-seconds)

context: process_by_lua*

arguments:

time-of-seconds : sleeps for the specified seconds without blocking. One can specify time resolution up to 0.001 seconds (i.e., one milliseconds).

returns: [no]

example:

ngx.sleep(1.5)

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ngx.utctime

syntax: str = ngx.utctime()

context: init_by_lua*, process_by_lua*

arguments: [no]

returns:

str : current time stamp (in the format yyyy-mm-dd hh:mm:ss) of the nginx cached time (no syscall involved unlike Lua's os.date function).

example:

This is the UTC time.

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ngx.localtime

syntax: str = ngx.localtime()

context: init_by_lua*, process_by_lua*

arguments: [no]

returns:

str : Returns the current time stamp (in the format yyyy-mm-dd hh:mm:ss) of the nginx cached time (no syscall involved unlike Lua's os.date function).

example:

This is the local time.

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ngx.time

syntax: secs = ngx.time()

context: init_by_lua*, process_by_lua*

arguments: [no]

returns:

secs : Returns the elapsed seconds from the epoch for the current time stamp from the nginx cached time (no syscall involved unlike Lua's date library).

example:

Updates of the Nginx time cache an be forced by calling ngx.update_time first.

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ngx.now

syntax: secs = ngx.now()

context: init_by_lua*, process_by_lua*

arguments: [no]

returns:

secs : Returns a floating-point number for the elapsed time in seconds (including milliseconds as the decimal part) from the epoch for the current time stamp from the nginx cached time (no syscall involved unlike Lua's date library).

example:

Updates of the Nginx time cache an be forced by calling ngx.update_time first.

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ngx.today

syntax: str = ngx.today()

context: init_by_lua*, process_by_lua*

arguments: [no]

returns:

str : Returns current date (in the format yyyy-mm-dd) from the nginx cached time (no syscall involved unlike Lua's date library).

example:

This is the local time.

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ngx.tcp_time

syntax: str = ngx.tcp_time(sec)

context: init_by_lua*, process_by_lua*

arguments:

sec: time stamp in seconds (like those returned from ngx.time).

returns:

str : Returns a formated string can be used as the http header time.

example:

ngx.say(ngx.http_time(1290079655))
 -- yields "Thu, 18 Nov 2010 11:27:35 GMT"

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ngx.parse_tcp_time

syntax: sec = ngx.parse_http_time(str)

context: init_by_lua*, process_by_lua*

arguments:

str : A formated string can be used as the http header time.

returns:

sec: time stamp in seconds (like those returned from ngx.time).

example:

 local time = ngx.parse_http_time("Thu, 18 Nov 2010 11:27:35 GMT")
 if time == nil then
     ...
 end

Parse the http time string (as returned by ngx.http_time) into seconds. Returns the seconds or nil if the input string is in bad forms.

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ngx.update_time

syntax: ngx.update_time()

context: init_by_lua*, process_by_lua*

arguments: [no]

returns: [no]

example:

Forcibly updates the Nginx current time cache. This call involves a syscall and thus has some overhead, so do not abuse it.

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ngx.start_time

syntax: secs =ngx.start_time()

context: process_by_lua*

arguments: [no]

returns:

A floating-point number representing the timestamp (including milliseconds as the decimal part) when the current request was created.

example:

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ngx.socket.tcp

syntax: tcpsock = ngx.socket.tcp()

context: process_by_lua*

arguments: [no]

returns:

tcpsock: Creates and returns a TCP object (also known as one type of the "cosocket" objects).

example:

The following methods are supported on this object:

connect
sslhandshake
receive
receive_http
send
close
setoption
settimeout
getreusedtimes
setkeepalive

It is intended to be compatible with the TCP API of the LuaSocket library but is 100% nonblocking out of the box. Also, we introduce some new APIs to provide more functionalities.

The cosocket object created by this API function has exactly the same lifetime as the Lua handler creating it. So never pass the cosocket object to any other Lua handler (including ngx.timer callback functions) and never share the cosocket object between different NGINX requests.

For every cosocket object's underlying connection, if you do not explicitly close it (via close) or put it back to the connection pool (via setkeepalive), then it is automatically closed when one of the following two events happens:

the current request handler completes, or
the Lua cosocket object value gets collected by the Lua GC.

Fatal errors in cosocket operations always automatically close the current connection (note that, read timeout error is the only error that is not fatal), and if you call close on a closed connection, you will get the "closed" error.

After create cosocket, the default connect timedout is value set by lua_socket_connect_timeout, default send timedout is value set by send_timeout, default read timedout is value set by read_timeout. And it can be changed by tcpsock:settimeout in any time.

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tcpsock:connect

syntax: ok, err = tcpsock:connect(host, port, pool_name)

context: process_by_lua*

arguments:

host: string type, need ip or domain name
port: numebr type, [0,65536]
pool_name: specify a custom name for the connection pool being used. If omitted, then the connection pool name will be generated from the string template "<host>:<port>"

returns: ok, err possiable values:

1,nil : connect ok.
nil,<error msg> : failed.

example:

local ok,err = tcpsock:connect("127.0.0.1", 80, "httphost")

Calling this method on an already connected socket object will cause the original connection to be closed first.

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tcpsock:sslhandshake

syntax: ok, err = tcpsock:sslhandshake()

context: process_by_lua*

arguments:

returns: ok, err possiable values:

example:

Back to TOC

tcpsock:receive

syntax: ok, err = tcpsock:receive()

context: process_by_lua*

arguments:

returns: ok, err possiable values:

example:

Back to TOC

tcpsock:receive_http

syntax: ok, err = tcpsock:receive_http()

context: process_by_lua*

arguments:

returns: ok, err possiable values:

example:

Back to TOC

tcpsock:send

syntax: ok, err = tcpsock:send()

context: process_by_lua*

arguments:

returns: ok, err possiable values:

example:

Back to TOC

tcpsock:close

syntax: ok, err = tcpsock:close()

context: process_by_lua*

arguments:

returns: ok, err possiable values:

example:

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tcpsock:setoption

syntax: ok, err = tcpsock:setoption()

context: process_by_lua*

arguments:

returns: ok, err possiable values:

example:

Back to TOC

tcpsock:settimeout

syntax: ok, err = tcpsock:settimeout()

context: process_by_lua*

arguments:

returns: ok, err possiable values:

example:

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tcpsock:getreusedtimes

syntax: ok, err = tcpsock:getreusedtimes()

context: process_by_lua*

arguments:

returns: ok, err possiable values:

example:

Back to TOC

tcpsock:setkeepalive

syntax: ok, err = tcpsock:setkeepalive()

context: process_by_lua*

arguments:

returns: ok, err possiable values:

example:

Back to TOC

ngx.new_ssl_ctx

syntax: ok, err = ngx.new_ssl_ctx()

context: process_by_lua*

arguments:

returns: ok, err possiable values:

example:

Back to TOC

ngx.log

syntax: ok, err = ngx.log()

context: process_by_lua*

arguments:

returns: ok, err possiable values:

example:

Back to TOC

ngx.print

syntax: ok, err = ngx.print()

context: process_by_lua*

arguments:

returns: ok, err possiable values:

example:

Back to TOC

ngx.nlog

syntax: ok, err = ngx.nlog()

context: process_by_lua*

arguments:

returns: ok, err possiable values:

example:

Back to TOC

nlog:send

syntax: ok, err = nlog:send()

context: process_by_lua*

arguments:

returns: ok, err possiable values:

example:

Back to TOC

ngx.re.find

refer to https://github.com/openresty/lua-nginx-module/blob/master/README.markdown#ngxrefind

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ngx.re.match

syntax: captures, err = ngx.re.match(subject, regex, options?, ctx?, res_table?)

context: process_by_lua*

arguments:

returns: ok, err possiable values:

example:

 local m, err = ngx.re.match("hello, 1234", "[0-9]+")
 if m then
     -- m[0] == "1234"

 else
     if err then
         ngx.log(ngx.ERR, "error: ", err)
         return
     end

     ngx.say("match not found")
 end

 local m, err = ngx.re.match("hello, 1234", "([0-9])[0-9]+")
 -- m[0] == "1234"
 -- m[1] == "1"

Matches the subject string using the Perl compatible regular expression regex with the optional options.

Only the first occurrence of the match is returned, or nil if no match is found. In case of errors, like seeing a bad regular expression or exceeding the PCRE stack limit, nil and a string describing the error will be returned.

When a match is found, a Lua table captures is returned, where captures[0] holds the whole substring being matched, and captures[1] holds the first parenthesized sub-pattern's capturing, captures[2] the second, and so on.

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