Name
    ngx_rds_json - an output filter that formats Resty
        DBD Streams generated by ngx_drizzle and others to JSON

Status
    This module is considered production ready.

    We need your help! If you find this module useful and/or
    interesting, please consider joining the development!
    Commit bit can be freely delivered at your request ;)

Synopsis

   server {
        location /mysql {
            drizzle_query 'select * from cats';
            drizzle_pass my_mysql_upstream;

            rds_json on;
        }

        location /foo {
            if ($arg_limit !~ '^\d{2}$') {
                rds_json_ret 400 'Bad "limit" argument';
            }

            drizzle_query "select * from dogs limit $arg_limit";
            drizzle_pass my_mysql_upstream;

            rds_json on;
        }
        ...
    }

Description
    This module provides an output filter that can format the RDS outputs
    generated by ngx_drizzle and ngx_postgres modules.

Directives
    rds_json
        syntax: rds_json  on|off
        default: rds_json off

        Enables or disables the output filter of this module.

    rds_json_buffer_size
        syntax: rds_json_buffer_size   <bytes>
        default: rds_json_buffer_size <page-size>

        Controls the buffer size used by this module. default to the page size (4k/8k).
        The bigger the buffer size, the less streammy the conversion
        will be. But usually increasing the buffer size
        does help reduce CPU time.

    rds_json_format
        syntax: rds_json_format  normal|compact
        default: rds_json_format normal

        Controls the output JSON format. A sample of the default "normal" format
        looks like this

            [{"id":1,"name":"marry"},{"id":2,"name":"bob"}]

        while it looks like below when in the "compact" format

            [["id","name"],[1,"marry"],[2,"bob"]]

        that is, the first row holds the column name list.

    rds_json_ret
        syntax: rds_json_ret <error-code> <descrption>
        default: none

        This directive enables a content handler that simply emits
        an response body like this:

            {"errcode":<error-code>,"errstr":"<description>"}

        while the <description> string will be properly quoted as
        a JSON string.

    rds_json_content_type
        syntax: rds_json_content_type <mime-type>
        default: rds_json_content_type application/json

        Controls the Content-Type header of the response generated by
        this module's output filter.

Installation
    Grab the nginx source code from nginx.net (<http://nginx.net/ >), for
    example, the version 0.8.54 (see nginx compatibility), and then build
    the source with this module:

        $ wget 'http://sysoev.ru/nginx/nginx-0.8.54.tar.gz'
        $ tar -xzvf nginx-0.8.54.tar.gz
        $ cd nginx-0.8.54/

        # Here we assume you would install you nginx under /opt/nginx/.
        $ ./configure --prefix=/opt/nginx \
            --add-module=/path/to/drizzle-nginx-module
            --add-module=/path/to/rds-json-nginx-module

        $ make -j2
        $ make install

    Download the latest version of the release tarball of this module from
    rds-json-nginx-module file list
    (<http://github.com/agentzh/rds-json-nginx-module/downloads >).

Compatibility
    The following versions of Nginx should work with this module:

    *   0.9.x (last tested: 0.9.4)

    *   0.8.x (last tested: 0.8.54)

    *   0.7.x >= 0.7.46 (last tested: 0.7.68)

    Earlier versions of Nginx like 0.6.x and 0.5.x will *not* work.

    If you find that any particular version of Nginx above 0.7.44 does not
    work with this module, please consider reporting a bug.

TODO

Known Issues

See Also

    * ngx_drizzle ( http://github.com/chaoslawful/drizzle-nginx-module )

    * ngx_postgres ( http://github.com/FRiCKLE/ngx_postgres/ )

Author
    agentzh (章亦春) <agentzh at gmail dot com>

Copyright & License
    This module is licenced under the BSD license.

    Copyright (c) 2009, 2010, 2011, Taobao Inc., Alibaba Group ( http://www.taobao.com ).

    Copyright (C) 2009, 2010, 2011, Yichun "agentzh" Zhang (章亦春) <agentzh@gmail.com>.

    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.