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/* Server hooks API example
*
* -----------------------------------------------------------------------------
*
* Copyright (c) 2019-Present, Redis Ltd.
* All rights reserved.
*
* Licensed under your choice of (a) the Redis Source Available License 2.0
* (RSALv2); or (b) the Server Side Public License v1 (SSPLv1); or (c) the
* GNU Affero General Public License v3 (AGPLv3).
*/
#include "../redismodule.h"
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
/* Client state change callback. */
void clientChangeCallback(RedisModuleCtx *ctx, RedisModuleEvent e, uint64_t sub, void *data)
{
REDISMODULE_NOT_USED(ctx);
REDISMODULE_NOT_USED(e);
RedisModuleClientInfo *ci = data;
printf("Client %s event for client #%llu %s:%d\n",
(sub == REDISMODULE_SUBEVENT_CLIENT_CHANGE_CONNECTED) ?
"connection" : "disconnection",
(unsigned long long)ci->id,ci->addr,ci->port);
}
void flushdbCallback(RedisModuleCtx *ctx, RedisModuleEvent e, uint64_t sub, void *data)
{
REDISMODULE_NOT_USED(ctx);
REDISMODULE_NOT_USED(e);
RedisModuleFlushInfo *fi = data;
if (sub == REDISMODULE_SUBEVENT_FLUSHDB_START) {
if (fi->dbnum != -1) {
RedisModuleCallReply *reply;
reply = RedisModule_Call(ctx,"DBSIZE","");
long long numkeys = RedisModule_CallReplyInteger(reply);
printf("FLUSHDB event of database %d started (%lld keys in DB)\n",
fi->dbnum, numkeys);
RedisModule_FreeCallReply(reply);
} else {
printf("FLUSHALL event started\n");
}
} else {
if (fi->dbnum != -1) {
printf("FLUSHDB event of database %d ended\n",fi->dbnum);
} else {
printf("FLUSHALL event ended\n");
}
}
}
/* 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,"hellohook",1,REDISMODULE_APIVER_1)
== REDISMODULE_ERR) return REDISMODULE_ERR;
RedisModule_SubscribeToServerEvent(ctx,
RedisModuleEvent_ClientChange, clientChangeCallback);
RedisModule_SubscribeToServerEvent(ctx,
RedisModuleEvent_FlushDB, flushdbCallback);
return REDISMODULE_OK;
}