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ruanhaishen
redis
Commits
880ca077
Commit
880ca077
authored
Sep 26, 2018
by
antirez
Browse files
Modules: hellodict example WIP #1: SET command.
parent
bbe18eac
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1
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src/modules/hellodict.c
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880ca077
/* Hellodict -- An example of modules dictionary API
*
* This module implements a volatile key-value store on top of the
* dictionary exported by the Redis modules API.
*
* -----------------------------------------------------------------------------
*
* Copyright (c) 2018, Salvatore Sanfilippo <antirez at gmail dot 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.
* * Neither the name of Redis nor the names of its contributors may be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* 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 OWNER 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.
*/
#define REDISMODULE_EXPERIMENTAL_API
#include "../redismodule.h"
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
static
RedisModuleDict
*
Keyspace
;
/* HELLODICT.SET <key> <value>
*
* Set the specified key to the specified value. */
int
cmd_SET
(
RedisModuleCtx
*
ctx
,
RedisModuleString
**
argv
,
int
argc
)
{
if
(
argc
!=
3
)
return
RedisModule_WrongArity
(
ctx
);
RedisModule_DictSet
(
Keyspace
,
argv
[
1
],
argv
[
2
]);
/* We need to keep a reference to the value stored at the key, otherwise
* it would be freed when this callback returns. */
RedisModule_RetainString
(
NULL
,
argv
[
2
]);
return
RedisModule_ReplyWithSimpleString
(
ctx
,
"OK"
);
}
/* This function must be present on each Redis module. It is used in order to
* register the commands into the Redis server. */
int
RedisModule_OnLoad
(
RedisModuleCtx
*
ctx
,
RedisModuleString
**
argv
,
int
argc
)
{
REDISMODULE_NOT_USED
(
argv
);
REDISMODULE_NOT_USED
(
argc
);
if
(
RedisModule_Init
(
ctx
,
"hellodict"
,
1
,
REDISMODULE_APIVER_1
)
==
REDISMODULE_ERR
)
return
REDISMODULE_ERR
;
if
(
RedisModule_CreateCommand
(
ctx
,
"hellodict.set"
,
cmd_SET
,
"write deny-oom"
,
1
,
1
,
0
)
==
REDISMODULE_ERR
)
return
REDISMODULE_ERR
;
/* Create our global dictionray. Here we'll set our keys and values. */
Keyspace
=
RedisModule_CreateDict
(
NULL
);
return
REDISMODULE_OK
;
}
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