Redis2

The redis2 module provides the ability to interact with a Redis server 2.x. It implements the full unified Redis 2.0 protocol, including support for Redis pipelining.

Loading the Module

To work with the module, it must be loaded in the context of main{}. The example below also uses directives from the set-misc module:

load_module modules/ndk_http_module.so;
load_module modules/ngx_http_set_misc_module.so;
load_module modules/ngx_http_redis2_module.so;

Configuration Example

upstream redis_upstream {
    server 127.0.0.1:6379;
}

server {
    listen       80;
    server_name  localhost;

    # Set key value
    location /foo {
        set $value 'first';
        redis2_query set one $value;
        redis2_pass redis_upstream;
    }

    # Get value by key
    location /bar {
        redis2_query get one;
        redis2_pass redis_upstream;
    }

    # Set key value from query parameters
    location /set {
        set_unescape_uri $key $arg_key;
        set_unescape_uri $val $arg_val;
        redis2_query set $key $val;
        redis2_pass 127.0.0.1:6379;
    }

    # Get value by key from query parameters
    location /get {
        set_unescape_uri $key $arg_key;
        redis2_query get $key;
        redis2_pass 127.0.0.1:6379;
    }

    # Execute multiple pipelined commands
    location /pipeline {
        set $value 'first';
        redis2_query set one $value;
        redis2_query get one;
        redis2_query set one 'first first';
        redis2_query get one;
        redis2_pass 127.0.0.1:6379;
    }

    # Execute arbitrary command passed in query parameter
    location /cmd {
        set_unescape_uri $cmd $arg_command;
        redis2_raw_query "$cmd\r\n";
        redis2_pass 127.0.0.1:6379;
    }
}

Warning

Important! Unlike the proxy_pass directive in Angie, using variables in the parameter of the redis2_pass directive is not allowed.

Demonstrating Request Execution

Examples of working with the module.

$ curl localhost/foo
+OK

$ curl localhost/bar
$5
first

Here $5 is the length of the value (5 bytes), and first is the value itself.

$ curl 'localhost/set/?key=two&val=second%20value'
+OK

$ curl 'localhost/get/?key=two'
$12
second value

$ curl 'localhost/get/?key=three'
$-1

The value $-1 indicates that the key three does not exist.

$ curl localhost/pipeline
+OK
$5
first
+OK
$11
first first

Executing arbitrary Redis commands:

$ curl 'localhost/cmd/?command=set%20three%20"third%20value"'
+OK

$ curl 'localhost/cmd/?command=get%20three'
$11
third value

Additional Information

Detailed documentation and source code are available at: openresty/redis2-nginx-module.