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https://github.com/openresty/redis2-nginx-module

Nginx upstream module for the Redis 2.0 protocol
https://github.com/openresty/redis2-nginx-module

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Nginx upstream module for the Redis 2.0 protocol

Lists

README 

        
Name

====



ngx_redis2 - Nginx upstream module for the Redis 2.0 protocol



*This module is not distributed with the Nginx source.* See [the installation instructions](#installation).



Table of Contents

=================



* [Name](#name)

* [Status](#status)

* [Version](#version)

* [Synopsis](#synopsis)

* [Description](#description)

* [Directives](#directives)

    * [redis2_query](#redis2_query)

    * [redis2_raw_query](#redis2_raw_query)

    * [redis2_raw_queries](#redis2_raw_queries)

    * [redis2_literal_raw_query](#redis2_literal_raw_query)

    * [redis2_pass](#redis2_pass)

    * [redis2_connect_timeout](#redis2_connect_timeout)

    * [redis2_send_timeout](#redis2_send_timeout)

    * [redis2_read_timeout](#redis2_read_timeout)

    * [redis2_buffer_size](#redis2_buffer_size)

    * [redis2_next_upstream](#redis2_next_upstream)

* [Connection Pool](#connection-pool)

* [Selecting Redis Databases](#selecting-redis-databases)

* [Lua Interoperability](#lua-interoperability)

    * [Pipelined Redis Requests by Lua](#pipelined-redis-requests-by-lua)

* [Redis Publish/Subscribe Support](#redis-publishsubscribe-support)

    * [Limitations For Redis Publish/Subscribe](#limitations-for-redis-publishsubscribe)

* [Performance Tuning](#performance-tuning)

* [Installation](#installation)

* [Compatibility](#compatibility)

* [Community](#community)

    * [English Mailing List](#english-mailing-list)

    * [Chinese Mailing List](#chinese-mailing-list)

* [Bugs and Patches](#bugs-and-patches)

* [Source Repository](#source-repository)

* [TODO](#todo)

* [Author](#author)

* [Getting involved](#getting-involved)

* [Copyright & License](#copyright--license)

* [SEE ALSO](#see-also)



Status

======



This module is already production ready.



Version

=======



This document describes ngx_redis2 [v0.15](https://github.com/openresty/redis2-nginx-module/tags) released on 19 April 2018.



Synopsis

========



```nginx



 location = /foo {

     set $value 'first';

     redis2_query set one $value;

     redis2_pass 127.0.0.1:6379;

 }



 # GET /get?key=some_key

 location = /get {

     set_unescape_uri $key $arg_key;  # this requires ngx_set_misc

     redis2_query get $key;

     redis2_pass foo.com:6379;

 }



 # GET /set?key=one&val=first%20value

 location = /set {

     set_unescape_uri $key $arg_key;  # this requires ngx_set_misc

     set_unescape_uri $val $arg_val;  # this requires ngx_set_misc

     redis2_query set $key $val;

     redis2_pass foo.com:6379;

 }



 # multiple pipelined queries

 location = /foo {

     set $value 'first';

     redis2_query set one $value;

     redis2_query get one;

     redis2_query set one two;

     redis2_query get one;

     redis2_pass 127.0.0.1:6379;

 }



 location = /bar {

     # $ is not special here...

     redis2_literal_raw_query '*1\r\n$4\r\nping\r\n';

     redis2_pass 127.0.0.1:6379;

 }



 location = /bar {

     # variables can be used below and $ is special

     redis2_raw_query 'get one\r\n';

     redis2_pass 127.0.0.1:6379;

 }



 # GET /baz?get%20foo%0d%0a

 location = /baz {

     set_unescape_uri $query $query_string; # this requires the ngx_set_misc module

     redis2_raw_query $query;

     redis2_pass 127.0.0.1:6379;

 }



 location = /init {

     redis2_query del key1;

     redis2_query lpush key1 C;

     redis2_query lpush key1 B;

     redis2_query lpush key1 A;

     redis2_pass 127.0.0.1:6379;

 }



 location = /get {

     redis2_query lrange key1 0 -1;

     redis2_pass 127.0.0.1:6379;

 }

```



[Back to TOC](#table-of-contents)



Description

===========



This is an Nginx upstream module that makes nginx talk to a [Redis](http://redis.io/) 2.x server in a non-blocking way. The full Redis 2.0 unified protocol has been implemented including the Redis pipelining support.



This module returns the raw TCP response from the Redis server. It's recommended to use my [lua-redis-parser](http://github.com/openresty/lua-redis-parser) (written in pure C) to parse these responses into lua data structure when combined with [lua-nginx-module](http://github.com/openresty/lua-nginx-module).



When used in conjunction with [lua-nginx-module](http://github.com/openresty/lua-nginx-module), it is recommended to use the [lua-resty-redis](http://github.com/openresty/lua-resty-redis) library instead of this module though, because the former is much more flexible and memory-efficient.



If you only want to use the `get` redis command, you can try out the [HttpRedisModule](http://wiki.nginx.org/HttpRedisModule). It returns the parsed content part of the Redis response because only `get` is needed to implement.



Another option is to parse the redis responses on your client side yourself.



[Back to TOC](#table-of-contents)



Directives

==========



[Back to TOC](#table-of-contents)



redis2_query

------------

**syntax:** *redis2_query cmd arg1 arg2 ...*



**default:** *no*



**context:** *location, location if*



Specify a Redis command by specifying its individual arguments (including the Redis command name itself) in a similar way to the `redis-cli` utility.



Multiple instances of this directive are allowed in a single location and these queries will be pipelined. For example,



```nginx



 location = /pipelined {

     redis2_query set hello world;

     redis2_query get hello;



     redis2_pass 127.0.0.1:$TEST_NGINX_REDIS_PORT;

 }

```



then `GET /pipelined` will yield two successive raw Redis responses



```nginx



 +OK

 $5

 world

```



while newlines here are actually `CR LF` (`\r\n`).



[Back to TOC](#table-of-contents)



redis2_raw_query

----------------

**syntax:** *redis2_raw_query QUERY*



**default:** *no*



**context:** *location, location if*



Specify raw Redis queries and nginx variables are recognized in the `QUERY` argument.



Only *one* Redis command is allowed in the `QUERY` argument, or you'll receive an error. If you want to specify multiple pipelined commands in a single query, use the [redis2_raw_queries](#redis2_raw_queries) directive instead.



[Back to TOC](#table-of-contents)



redis2_raw_queries

------------------

**syntax:** *redis2_raw_queries N QUERIES*



**default:** *no*



**context:** *location, location if*



Specify `N` commands in the `QUERIES` argument. Both the `N` and `QUERIES`

arguments can take Nginx variables.



Here's some examples

```nginx



 location = /pipelined {

     redis2_raw_queries 3 "flushall\r\nget key1\r\nget key2\r\n";

     redis2_pass 127.0.0.1:6379;

 }



 # GET /pipelined2?n=2&cmds=flushall%0D%0Aget%20key%0D%0A

 location = /pipelined2 {

     set_unescape_uri $n $arg_n;

     set_unescape_uri $cmds $arg_cmds;



     redis2_raw_queries $n $cmds;



     redis2_pass 127.0.0.1:6379;

 }

```

Note that in the second sample above, the [set_unescape_uri](http://github.com/openresty/set-misc-nginx-module#set_unescape_uri) directive is provided by the [set-misc-nginx-module](http://github.com/openresty/set-misc-nginx-module).



[Back to TOC](#table-of-contents)



redis2_literal_raw_query

------------------------

**syntax:** *redis2_literal_raw_query QUERY*



**default:** *no*



**context:** *location, location if*



Specify a raw Redis query but Nginx variables in it will not be *not* recognized. In other words, you're free to use the dollar sign character (`$`) in your `QUERY` argument.



Only One redis command is allowed in the `QUERY` argument.



[Back to TOC](#table-of-contents)



redis2_pass

-----------

**syntax:** *redis2_pass <upstream_name>*



**syntax:** *redis2_pass <host>:<port>*



**default:** *no*



**context:** *location, location if*



**phase:** *content*



Specify the Redis server backend. 



[Back to TOC](#table-of-contents)



redis2_connect_timeout

----------------------

**syntax:** *redis2_connect_timeout <time>*



**default:** *60s*



**context:** *http, server, location*



The timeout for connecting to the Redis server, in seconds by default.



It's wise to always explicitly specify the time unit to avoid confusion. Time units supported are `s`(seconds), `ms`(milliseconds), `y`(years), `M`(months), `w`(weeks), `d`(days), `h`(hours), and `m`(minutes).



This time must be less than 597 hours.



[Back to TOC](#table-of-contents)



redis2_send_timeout

-------------------

**syntax:** *redis2_send_timeout <time>*



**default:** *60s*



**context:** *http, server, location*



The timeout for sending TCP requests to the Redis server, in seconds by default.



It's wise to always explicitly specify the time unit to avoid confusion. Time units supported are `s`(seconds), `ms`(milliseconds), `y`(years), `M`(months), `w`(weeks), `d`(days), `h`(hours), and `m`(minutes).



[Back to TOC](#table-of-contents)



redis2_read_timeout

-------------------

**syntax:** *redis2_read_timeout <time>*



**default:** *60s*



**context:** *http, server, location*



The timeout for reading TCP responses from the redis server, in seconds by default.



It's wise to always explicitly specify the time unit to avoid confusion. Time units supported are `s`(seconds), `ms`(milliseconds), `y`(years), `M`(months), `w`(weeks), `d`(days), `h`(hours), and `m`(minutes).



[Back to TOC](#table-of-contents)



redis2_buffer_size

------------------

**syntax:** *redis2_buffer_size <size>*



**default:** *4k/8k*



**context:** *http, server, location*



This buffer size is used for reading Redis replies, but it's not required to be as big as the largest possible Redis reply.



This default size is the page size, may be 4k or 8k.



[Back to TOC](#table-of-contents)



redis2_next_upstream

--------------------

**syntax:** *redis2_next_upstream [ error | timeout | invalid_response | off ]*



**default:** *error timeout*



**context:** *http, server, location*



Specify which failure conditions should cause the request to be forwarded to another

upstream server. Applies only when the value in [redis2_pass](#redis2_pass) is an upstream with two or more

servers.



Here's an artificial example:

```nginx



 upstream redis_cluster {

     server 127.0.0.1:6379;

     server 127.0.0.1:6380;

 }



 server {

     location = /redis {

         redis2_next_upstream error timeout invalid_response;

         redis2_query get foo;

         redis2_pass redis_cluster;

     }

 }

```



[Back to TOC](#table-of-contents)



Connection Pool

===============



You can use the excellent [HttpUpstreamKeepaliveModule](http://wiki.nginx.org/HttpUpstreamKeepaliveModule) with this module to provide TCP connection pool for Redis.



A sample config snippet looks like this



```nginx



 http {

     upstream backend {

       server 127.0.0.1:6379;



       # a pool with at most 1024 connections

       # and do not distinguish the servers:

       keepalive 1024;

     }



     server {

         ...

         location = /redis {

             set_unescape_uri $query $arg_query;

             redis2_query $query;

             redis2_pass backend;

         }

     }

 }

```



[Back to TOC](#table-of-contents)



Selecting Redis Databases

=========================



Redis provides the [select](http://redis.io/commands/SELECT) command to switch Redis databaess. This command is no different from other normal commands

like [get](http://redis.io/commands/GET) or [set](http://redis.io/commands/SET). So you can use them in [redis2_query](#redis2_query) directives, for

example,



```nginx

redis2_query select 8;

redis2_query get foo;

```



[Back to TOC](#table-of-contents)



Lua Interoperability

====================



This module can be served as a non-blocking redis2 client for [lua-nginx-module](http://github.com/openresty/lua-nginx-module) (but nowadays it is recommended to use the [lua-resty-redis](http://github.com/openresty/lua-resty-redis) library instead, which is much simpler to use and more efficient most of the time).

Here's an example using a GET subrequest:



```nginx



 location = /redis {

     internal;



     # set_unescape_uri is provided by ngx_set_misc

     set_unescape_uri $query $arg_query;



     redis2_raw_query $query;

     redis2_pass 127.0.0.1:6379;

 }



 location = /main {

     content_by_lua '

         local res = ngx.location.capture("/redis",

             { args = { query = "ping\\r\\n" } }

         )

         ngx.print("[" .. res.body .. "]")

     ';

 }

```



Then accessing `/main` yields



    [+PONG\r\n]



where `\r\n` is `CRLF`. That is, this module returns the *raw* TCP responses from the remote redis server. For Lua-based application developers, they may want to utilize the [lua-redis-parser](http://github.com/openresty/lua-redis-parser) library (written in pure C) to parse such raw responses into Lua data structures.



When moving the inlined Lua code into an external `.lua` file, it's important to use the escape sequence `\r\n` directly. We used `\\r\\n` above just because the Lua code itself needs quoting when being put into an Nginx string literal.



You can also use POST/PUT subrequests to transfer the raw Redis request via request body, which does not require URI escaping and unescaping, thus saving some CPU cycles. Here's such an example:



```nginx



 location = /redis {

     internal;



     # $echo_request_body is provided by the ngx_echo module

     redis2_raw_query $echo_request_body;



     redis2_pass 127.0.0.1:6379;

 }



 location = /main {

     content_by_lua '

         local res = ngx.location.capture("/redis",

             { method = ngx.HTTP_PUT,

               body = "ping\\r\\n" }

         )

         ngx.print("[" .. res.body .. "]")

     ';

 }

```



> **Important** The nginx variable `$request_body` *only* contains content buffered into memory. If nginx writes the request body to a temporary file (default behavior) the `$request_body` will **not** include the entire content or may be empty. It's recommended to use `$echo_request_body` which reads the full request body (regardless of being in buffer or temporary file).



This yeilds exactly the same output as the previous (GET) sample.



One can also use Lua to pick up a concrete Redis backend based on some complicated hashing rules. For instance,



```nginx



 upstream redis-a {

     server foo.bar.com:6379;

 }



 upstream redis-b {

     server bar.baz.com:6379;

 }



 upstream redis-c {

     server blah.blah.org:6379;

 }



 server {

     ...



     location = /redis {

         set_unescape_uri $query $arg_query;

         redis2_query $query;

         redis2_pass $arg_backend;

     }



     location = /foo {

         content_by_lua "

             -- pick up a server randomly

             local servers = {'redis-a', 'redis-b', 'redis-c'}

             local i = ngx.time() % #servers + 1;

             local srv = servers[i]



             local res = ngx.location.capture('/redis',

                 { args = {

                     query = '...',

                     backend = srv

                   }

                 }

             )

             ngx.say(res.body)

         ";

     }

 }

```



[Back to TOC](#table-of-contents)



Pipelined Redis Requests by Lua

-------------------------------



Here's a complete example demonstrating how to use Lua to issue multiple pipelined Redis requests via this Nginx module.



First of all, we include the following in our `nginx.conf` file:



```nginx



 location = /redis2 {

     internal;



     redis2_raw_queries $args $echo_request_body;

     redis2_pass 127.0.0.1:6379;

 }



 location = /test {

     content_by_lua_file conf/test.lua;

 }

```



Basically we use URI query args to pass the number of Redis requests and request body to pass the pipelined Redis request string.



And then we create the `conf/test.lua` file (whose path is relative to the server root of Nginx) to include the following Lua code:



```lua



 -- conf/test.lua

 local parser = require "redis.parser"



 local reqs = {

     {"set", "foo", "hello world"},

     {"get", "foo"}

 }



 local raw_reqs = {}

 for i, req in ipairs(reqs) do

     table.insert(raw_reqs, parser.build_query(req))

 end



 local res = ngx.location.capture("/redis2?" .. #reqs,

     { body = table.concat(raw_reqs, "") })



 if res.status ~= 200 or not res.body then

     ngx.log(ngx.ERR, "failed to query redis")

     ngx.exit(500)

 end



 local replies = parser.parse_replies(res.body, #reqs)

 for i, reply in ipairs(replies) do

     ngx.say(reply[1])

 end

```



Here we assume that your Redis server is listening on the default port (6379) of the localhost. We also make use of the [lua-redis-parser](http://github.com/openresty/lua-redis-parser) library to construct raw Redis queries for us and also use it to parse the replies.



Accessing the `/test` location via HTTP clients like `curl` yields the following output



    OK

    hello world



A more realistic setting is to use a proper upstream definition for our Redis backend and enable TCP connection pool via the [keepalive](http://wiki.nginx.org/HttpUpstreamKeepaliveModule#keepalive) directive in it.



[Back to TOC](#table-of-contents)



Redis Publish/Subscribe Support

===============================



This module has limited support for Redis publish/subscribe feature. It cannot be fully supported due to the stateless nature of REST and HTTP model.



Consider the following example:



```nginx



 location = /redis {

     redis2_raw_queries 2 "subscribe /foo/bar\r\n";

     redis2_pass 127.0.0.1:6379;

 }

```



And then publish a message for the key `/foo/bar` in the `redis-cli` command line. And then you'll receive two multi-bulk replies from the `/redis` location.



You can surely parse the replies with the [lua-redis-parser](http://github.com/openresty/lua-redis-parser) library if you're using Lua to access this module's location.



[Back to TOC](#table-of-contents)



Limitations For Redis Publish/Subscribe

---------------------------------------



If you want to use the [Redis pub/sub](http://redis.io/topics/pubsub) feature with this module, then you must note the following limitations:



* You cannot use [HttpUpstreamKeepaliveModule](http://wiki.nginx.org/HttpUpstreamKeepaliveModule) with this Redis upstream. Only short Redis connections will work.

* There may be some race conditions that produce the harmless `Redis server returned extra bytes` warnings in your nginx's error.log. Such warnings might be rare but just be prepared for it.

* You should tune the various timeout settings provided by this module like [redis2_connect_timeout](#redis2_connect_timeout) and [redis2_read_timeout](#redis2_read_timeout).



If you cannot stand these limitations, then you are highly recommended to switch to the [lua-resty-redis](https://github.com/openresty/lua-resty-redis) library for [lua-nginx-module](http://github.com/openresty/lua-nginx-module).



[Back to TOC](#table-of-contents)



Performance Tuning

==================



* When you're using this module, please ensure you're using a TCP connection pool (provided by [HttpUpstreamKeepaliveModule](http://wiki.nginx.org/HttpUpstreamKeepaliveModule)) and Redis pipelining wherever possible. These features will significantly improve performance.

* Using multiple instance of Redis servers on your multi-core machines also help a lot due to the sequential processing nature of a single Redis server instance.

* When you're benchmarking performance using something like `ab` or `http_load`, please ensure that your error log level is high enough (like `warn`) to prevent Nginx workers spend too much cycles on flushing the `error.log` file, which is always non-buffered and blocking and thus very expensive.



[Back to TOC](#table-of-contents)



Installation

============



You are recommended to install this module (as well as the Nginx core and many many other goodies) via the [ngx_openresty bundle](http://openresty.org). Check out the [installation instructions](http://openresty.org/#Installation) for setting up [ngx_openresty](http://openresty.org).



Alternatively, you can install this module manually by recompiling the standard Nginx core as follows:



* Grab the nginx source code from [nginx.org](http://nginx.org), for example, the version 1.11.2 (see nginx compatibility),

* and then download the latest version of the release tarball of this module from ngx_redis2's [file list](http://github.com/openresty/redis2-nginx-module/tags).

* and finally build the source with this module:

```bash



 wget 'http://nginx.org/download/nginx-1.11.2.tar.gz'

 tar -xzvf nginx-1.11.2.tar.gz

 cd nginx-1.11.2/



 # Here we assume you would install you nginx under /opt/nginx/.

 ./configure --prefix=/opt/nginx \

             --add-module=/path/to/redis2-nginx-module



 make -j2

 make install

```



Starting from NGINX 1.9.11, you can also compile this module as a dynamic module, by using the `--add-dynamic-module=PATH` option instead of `--add-module=PATH` on the

`./configure` command line above. And then you can explicitly load the module in your `nginx.conf` via the [load_module](http://nginx.org/en/docs/ngx_core_module.html#load_module)

directive, for example,



```nginx

load_module /path/to/modules/ngx_http_redis2_module.so;

```



[Back to TOC](#table-of-contents)



Compatibility

=============



Redis 2.0, 2.2, 2.4, and above should work with this module without any issues. So is the [Alchemy Database](http://code.google.com/p/alchemydatabase/) (aka redisql in its early days).



The following versions of Nginx should work with this module:



* **1.17.x**                      (last tested: 1.17.4)

* **1.16.x**

* **1.15.x**                      (last tested: 1.15.8)

* **1.14.x**

* **1.13.x**                      (last tested: 1.13.6)

* **1.12.x**

* 1.11.x (last tested: 1.11.2)

* 1.10.x

* 1.9.x (last tested: 1.9.15)

* 1.8.x

* 1.7.x (last tested: 1.7.10)

* 1.6.x

* 1.5.x (last tested: 1.5.12)

* 1.4.x (last tested: 1.4.3)

* 1.3.x (last tested: 1.3.7)

* 1.2.x (last tested: 1.2.7)

* 1.1.x (last tested: 1.1.5)

* 1.0.x (last tested: 1.0.10)

* 0.9.x (last tested: 0.9.4)

* 0.8.x >= 0.8.31 (last tested: 0.8.54)



Earlier versions of Nginx will *not* work.



If you find that any particular version of Nginx above 0.8.31 does not work with this module, please consider reporting a bug.



[Back to TOC](#table-of-contents)



Community

=========



[Back to TOC](#table-of-contents)



English Mailing List

--------------------



The [openresty-en](https://groups.google.com/group/openresty-en) mailing list is for English speakers.



[Back to TOC](#table-of-contents)



Chinese Mailing List

--------------------



The [openresty](https://groups.google.com/group/openresty) mailing list is for Chinese speakers.



[Back to TOC](#table-of-contents)



Bugs and Patches

================



Please submit bug reports, wishlists, or patches by



1. creating a ticket on the [GitHub Issue Tracker](http://github.com/openresty/redis2-nginx-module/issues),

1. or posting to the [OpenResty community](#community).



[Back to TOC](#table-of-contents)



Source Repository

=================



Available on github at [openresty/redis2-nginx-module](http://github.com/openresty/redis2-nginx-module).



[Back to TOC](#table-of-contents)



TODO

====

* Add the `redis2_as_json` directive to allow emitting JSON directly.



[Back to TOC](#table-of-contents)



Author

======



Yichun "agentzh" Zhang (章亦春) , OpenResty Inc.



[Back to TOC](#table-of-contents)



Getting involved

================



You'll be very welcomed to submit patches to the author or just ask for

a commit bit to the source repository on GitHub.



[Back to TOC](#table-of-contents)



Copyright & License

===================



This module is licenced under the BSD license.



Copyright (C) 2010-2018, by Yichun "agentzh" Zhang (章亦春) , OpenResty Inc.



All rights reserved.



Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:



* Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.



* Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.



THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.



[Back to TOC](#table-of-contents)



SEE ALSO

========

* The [Redis](http://redis.io/) server homepage.

* The Redis wire protocol: 

* a redis response parser and a request constructor for Lua: [lua-redis-parser](http://github.com/openresty/lua-redis-parser).

* [lua-nginx-module](http://github.com/openresty/lua-nginx-module)

* The [ngx_openresty bundle](http://openresty.org).

* The [lua-resty-redis](https://github.com/openresty/lua-resty-redis) library based on the [lua-nginx-module](http://github.com/openresty/lua-nginx-module) cosocket API.



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