Adding upstream version 5:7.2.4.upstream/5%7.2.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 516 insertions, 0 deletions

diff --git a/tests/modules/hooks.c b/tests/modules/hooks.c
new file mode 100644
index 0000000..fc357d1
--- /dev/null
+++ b/tests/modules/hooks.c
@@ -0,0 +1,516 @@
+/* This module is used to test the server events hooks API.
+ *
+ * -----------------------------------------------------------------------------
+ *
+ * Copyright (c) 2019, 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.
+ */
+
+#include "redismodule.h"
+#include <stdio.h>
+#include <string.h>
+#include <strings.h>
+#include <assert.h>
+
+/* We need to store events to be able to test and see what we got, and we can't
+ * store them in the key-space since that would mess up rdb loading (duplicates)
+ * and be lost of flushdb. */
+RedisModuleDict *event_log = NULL;
+/* stores all the keys on which we got 'removed' event */
+RedisModuleDict *removed_event_log = NULL;
+/* stores all the subevent on which we got 'removed' event */
+RedisModuleDict *removed_subevent_type = NULL;
+/* stores all the keys on which we got 'removed' event with expiry information */
+RedisModuleDict *removed_expiry_log = NULL;
+
+typedef struct EventElement {
+    long count;
+    RedisModuleString *last_val_string;
+    long last_val_int;
+} EventElement;
+
+void LogStringEvent(RedisModuleCtx *ctx, const char* keyname, const char* data) {
+    EventElement *event = RedisModule_DictGetC(event_log, (void*)keyname, strlen(keyname), NULL);
+    if (!event) {
+        event = RedisModule_Alloc(sizeof(EventElement));
+        memset(event, 0, sizeof(EventElement));
+        RedisModule_DictSetC(event_log, (void*)keyname, strlen(keyname), event);
+    }
+    if (event->last_val_string) RedisModule_FreeString(ctx, event->last_val_string);
+    event->last_val_string = RedisModule_CreateString(ctx, data, strlen(data));
+    event->count++;
+}
+
+void LogNumericEvent(RedisModuleCtx *ctx, const char* keyname, long data) {
+    REDISMODULE_NOT_USED(ctx);
+    EventElement *event = RedisModule_DictGetC(event_log, (void*)keyname, strlen(keyname), NULL);
+    if (!event) {
+        event = RedisModule_Alloc(sizeof(EventElement));
+        memset(event, 0, sizeof(EventElement));
+        RedisModule_DictSetC(event_log, (void*)keyname, strlen(keyname), event);
+    }
+    event->last_val_int = data;
+    event->count++;
+}
+
+void FreeEvent(RedisModuleCtx *ctx, EventElement *event) {
+    if (event->last_val_string)
+        RedisModule_FreeString(ctx, event->last_val_string);
+    RedisModule_Free(event);
+}
+
+int cmdEventCount(RedisModuleCtx *ctx, RedisModuleString **argv, int argc)
+{
+    if (argc != 2){
+        RedisModule_WrongArity(ctx);
+        return REDISMODULE_OK;
+    }
+
+    EventElement *event = RedisModule_DictGet(event_log, argv[1], NULL);
+    RedisModule_ReplyWithLongLong(ctx, event? event->count: 0);
+    return REDISMODULE_OK;
+}
+
+int cmdEventLast(RedisModuleCtx *ctx, RedisModuleString **argv, int argc)
+{
+    if (argc != 2){
+        RedisModule_WrongArity(ctx);
+        return REDISMODULE_OK;
+    }
+
+    EventElement *event = RedisModule_DictGet(event_log, argv[1], NULL);
+    if (event && event->last_val_string)
+        RedisModule_ReplyWithString(ctx, event->last_val_string);
+    else if (event)
+        RedisModule_ReplyWithLongLong(ctx, event->last_val_int);
+    else
+        RedisModule_ReplyWithNull(ctx);
+    return REDISMODULE_OK;
+}
+
+void clearEvents(RedisModuleCtx *ctx)
+{
+    RedisModuleString *key;
+    EventElement *event;
+    RedisModuleDictIter *iter = RedisModule_DictIteratorStart(event_log, "^", NULL);
+    while((key = RedisModule_DictNext(ctx, iter, (void**)&event)) != NULL) {
+        event->count = 0;
+        event->last_val_int = 0;
+        if (event->last_val_string) RedisModule_FreeString(ctx, event->last_val_string);
+        event->last_val_string = NULL;
+        RedisModule_DictDel(event_log, key, NULL);
+        RedisModule_Free(event);
+    }
+    RedisModule_DictIteratorStop(iter);
+}
+
+int cmdEventsClear(RedisModuleCtx *ctx, RedisModuleString **argv, int argc)
+{
+    REDISMODULE_NOT_USED(argc);
+    REDISMODULE_NOT_USED(argv);
+    clearEvents(ctx);
+    return REDISMODULE_OK;
+}
+
+/* Client state change callback. */
+void clientChangeCallback(RedisModuleCtx *ctx, RedisModuleEvent e, uint64_t sub, void *data)
+{
+    REDISMODULE_NOT_USED(e);
+
+    RedisModuleClientInfo *ci = data;
+    char *keyname = (sub == REDISMODULE_SUBEVENT_CLIENT_CHANGE_CONNECTED) ?
+        "client-connected" : "client-disconnected";
+    LogNumericEvent(ctx, keyname, ci->id);
+}
+
+void flushdbCallback(RedisModuleCtx *ctx, RedisModuleEvent e, uint64_t sub, void *data)
+{
+    REDISMODULE_NOT_USED(e);
+
+    RedisModuleFlushInfo *fi = data;
+    char *keyname = (sub == REDISMODULE_SUBEVENT_FLUSHDB_START) ?
+        "flush-start" : "flush-end";
+    LogNumericEvent(ctx, keyname, fi->dbnum);
+}
+
+void roleChangeCallback(RedisModuleCtx *ctx, RedisModuleEvent e, uint64_t sub, void *data)
+{
+    REDISMODULE_NOT_USED(e);
+    REDISMODULE_NOT_USED(data);
+
+    RedisModuleReplicationInfo *ri = data;
+    char *keyname = (sub == REDISMODULE_EVENT_REPLROLECHANGED_NOW_MASTER) ?
+        "role-master" : "role-replica";
+    LogStringEvent(ctx, keyname, ri->masterhost);
+}
+
+void replicationChangeCallback(RedisModuleCtx *ctx, RedisModuleEvent e, uint64_t sub, void *data)
+{
+    REDISMODULE_NOT_USED(e);
+    REDISMODULE_NOT_USED(data);
+
+    char *keyname = (sub == REDISMODULE_SUBEVENT_REPLICA_CHANGE_ONLINE) ?
+        "replica-online" : "replica-offline";
+    LogNumericEvent(ctx, keyname, 0);
+}
+
+void rasterLinkChangeCallback(RedisModuleCtx *ctx, RedisModuleEvent e, uint64_t sub, void *data)
+{
+    REDISMODULE_NOT_USED(e);
+    REDISMODULE_NOT_USED(data);
+
+    char *keyname = (sub == REDISMODULE_SUBEVENT_MASTER_LINK_UP) ?
+        "masterlink-up" : "masterlink-down";
+    LogNumericEvent(ctx, keyname, 0);
+}
+
+void persistenceCallback(RedisModuleCtx *ctx, RedisModuleEvent e, uint64_t sub, void *data)
+{
+    REDISMODULE_NOT_USED(e);
+    REDISMODULE_NOT_USED(data);
+
+    char *keyname = NULL;
+    switch (sub) {
+        case REDISMODULE_SUBEVENT_PERSISTENCE_RDB_START: keyname = "persistence-rdb-start"; break;
+        case REDISMODULE_SUBEVENT_PERSISTENCE_AOF_START: keyname = "persistence-aof-start"; break;
+        case REDISMODULE_SUBEVENT_PERSISTENCE_SYNC_AOF_START: keyname = "persistence-syncaof-start"; break;
+        case REDISMODULE_SUBEVENT_PERSISTENCE_SYNC_RDB_START: keyname = "persistence-syncrdb-start"; break;
+        case REDISMODULE_SUBEVENT_PERSISTENCE_ENDED: keyname = "persistence-end"; break;
+        case REDISMODULE_SUBEVENT_PERSISTENCE_FAILED: keyname = "persistence-failed"; break;
+    }
+    /* modifying the keyspace from the fork child is not an option, using log instead */
+    RedisModule_Log(ctx, "warning", "module-event-%s", keyname);
+    if (sub == REDISMODULE_SUBEVENT_PERSISTENCE_SYNC_RDB_START ||
+        sub == REDISMODULE_SUBEVENT_PERSISTENCE_SYNC_AOF_START) 
+    {
+        LogNumericEvent(ctx, keyname, 0);
+    }
+}
+
+void loadingCallback(RedisModuleCtx *ctx, RedisModuleEvent e, uint64_t sub, void *data)
+{
+    REDISMODULE_NOT_USED(e);
+    REDISMODULE_NOT_USED(data);
+
+    char *keyname = NULL;
+    switch (sub) {
+        case REDISMODULE_SUBEVENT_LOADING_RDB_START: keyname = "loading-rdb-start"; break;
+        case REDISMODULE_SUBEVENT_LOADING_AOF_START: keyname = "loading-aof-start"; break;
+        case REDISMODULE_SUBEVENT_LOADING_REPL_START: keyname = "loading-repl-start"; break;
+        case REDISMODULE_SUBEVENT_LOADING_ENDED: keyname = "loading-end"; break;
+        case REDISMODULE_SUBEVENT_LOADING_FAILED: keyname = "loading-failed"; break;
+    }
+    LogNumericEvent(ctx, keyname, 0);
+}
+
+void loadingProgressCallback(RedisModuleCtx *ctx, RedisModuleEvent e, uint64_t sub, void *data)
+{
+    REDISMODULE_NOT_USED(e);
+
+    RedisModuleLoadingProgress *ei = data;
+    char *keyname = (sub == REDISMODULE_SUBEVENT_LOADING_PROGRESS_RDB) ?
+        "loading-progress-rdb" : "loading-progress-aof";
+    LogNumericEvent(ctx, keyname, ei->progress);
+}
+
+void shutdownCallback(RedisModuleCtx *ctx, RedisModuleEvent e, uint64_t sub, void *data)
+{
+    REDISMODULE_NOT_USED(e);
+    REDISMODULE_NOT_USED(data);
+    REDISMODULE_NOT_USED(sub);
+
+    RedisModule_Log(ctx, "warning", "module-event-%s", "shutdown");
+}
+
+void cronLoopCallback(RedisModuleCtx *ctx, RedisModuleEvent e, uint64_t sub, void *data)
+{
+    REDISMODULE_NOT_USED(e);
+    REDISMODULE_NOT_USED(sub);
+
+    RedisModuleCronLoop *ei = data;
+    LogNumericEvent(ctx, "cron-loop", ei->hz);
+}
+
+void moduleChangeCallback(RedisModuleCtx *ctx, RedisModuleEvent e, uint64_t sub, void *data)
+{
+    REDISMODULE_NOT_USED(e);
+
+    RedisModuleModuleChange *ei = data;
+    char *keyname = (sub == REDISMODULE_SUBEVENT_MODULE_LOADED) ?
+        "module-loaded" : "module-unloaded";
+    LogStringEvent(ctx, keyname, ei->module_name);
+}
+
+void swapDbCallback(RedisModuleCtx *ctx, RedisModuleEvent e, uint64_t sub, void *data)
+{
+    REDISMODULE_NOT_USED(e);
+    REDISMODULE_NOT_USED(sub);
+
+    RedisModuleSwapDbInfo *ei = data;
+    LogNumericEvent(ctx, "swapdb-first", ei->dbnum_first);
+    LogNumericEvent(ctx, "swapdb-second", ei->dbnum_second);
+}
+
+void configChangeCallback(RedisModuleCtx *ctx, RedisModuleEvent e, uint64_t sub, void *data)
+{
+    REDISMODULE_NOT_USED(e);
+    if (sub != REDISMODULE_SUBEVENT_CONFIG_CHANGE) {
+        return;
+    }
+
+    RedisModuleConfigChangeV1 *ei = data;
+    LogNumericEvent(ctx, "config-change-count", ei->num_changes);
+    LogStringEvent(ctx, "config-change-first", ei->config_names[0]);
+}
+
+void keyInfoCallback(RedisModuleCtx *ctx, RedisModuleEvent e, uint64_t sub, void *data)
+{
+    REDISMODULE_NOT_USED(e);
+
+    RedisModuleKeyInfoV1 *ei = data;
+    RedisModuleKey *kp = ei->key;
+    RedisModuleString *key = (RedisModuleString *) RedisModule_GetKeyNameFromModuleKey(kp);
+    const char *keyname = RedisModule_StringPtrLen(key, NULL);
+    RedisModuleString *event_keyname = RedisModule_CreateStringPrintf(ctx, "key-info-%s", keyname);
+    LogStringEvent(ctx, RedisModule_StringPtrLen(event_keyname, NULL), keyname);
+    RedisModule_FreeString(ctx, event_keyname);
+
+    /* Despite getting a key object from the callback, we also try to re-open it
+     * to make sure the callback is called before it is actually removed from the keyspace. */
+    RedisModuleKey *kp_open = RedisModule_OpenKey(ctx, key, REDISMODULE_READ);
+    assert(RedisModule_ValueLength(kp) == RedisModule_ValueLength(kp_open));
+    RedisModule_CloseKey(kp_open);
+
+    /* We also try to RM_Call a command that accesses that key, also to make sure it's still in the keyspace. */
+    char *size_command = NULL;
+    int key_type = RedisModule_KeyType(kp);
+    if (key_type == REDISMODULE_KEYTYPE_STRING) {
+        size_command = "STRLEN";
+    } else if (key_type == REDISMODULE_KEYTYPE_LIST) {
+        size_command = "LLEN";
+    } else if (key_type == REDISMODULE_KEYTYPE_HASH) {
+        size_command = "HLEN";
+    } else if (key_type == REDISMODULE_KEYTYPE_SET) {
+        size_command = "SCARD";
+    } else if (key_type == REDISMODULE_KEYTYPE_ZSET) {
+        size_command = "ZCARD";
+    } else if (key_type == REDISMODULE_KEYTYPE_STREAM) {
+        size_command = "XLEN";
+    }
+    if (size_command != NULL) {
+        RedisModuleCallReply *reply = RedisModule_Call(ctx, size_command, "s", key);
+        assert(reply != NULL);
+        assert(RedisModule_ValueLength(kp) == (size_t) RedisModule_CallReplyInteger(reply));
+        RedisModule_FreeCallReply(reply);
+    }
+
+    /* Now use the key object we got from the callback for various validations. */
+    RedisModuleString *prev = RedisModule_DictGetC(removed_event_log, (void*)keyname, strlen(keyname), NULL);
+    /* We keep object length */
+    RedisModuleString *v = RedisModule_CreateStringPrintf(ctx, "%zd", RedisModule_ValueLength(kp));
+    /* For string type, we keep value instead of length */
+    if (RedisModule_KeyType(kp) == REDISMODULE_KEYTYPE_STRING) {
+        RedisModule_FreeString(ctx, v);
+        size_t len;
+        /* We need to access the string value with RedisModule_StringDMA.
+         * RedisModule_StringDMA may call dbUnshareStringValue to free the origin object,
+         * so we also can test it. */
+        char *s = RedisModule_StringDMA(kp, &len, REDISMODULE_READ);
+        v = RedisModule_CreateString(ctx, s, len);
+    }
+    RedisModule_DictReplaceC(removed_event_log, (void*)keyname, strlen(keyname), v);
+    if (prev != NULL) {
+        RedisModule_FreeString(ctx, prev);
+    }
+
+    const char *subevent = "deleted";
+    if (sub == REDISMODULE_SUBEVENT_KEY_EXPIRED) {
+        subevent = "expired";
+    } else if (sub == REDISMODULE_SUBEVENT_KEY_EVICTED) {
+        subevent = "evicted";
+    } else if (sub == REDISMODULE_SUBEVENT_KEY_OVERWRITTEN) {
+        subevent = "overwritten";
+    }
+    RedisModule_DictReplaceC(removed_subevent_type, (void*)keyname, strlen(keyname), (void *)subevent);
+
+    RedisModuleString *prevexpire = RedisModule_DictGetC(removed_expiry_log, (void*)keyname, strlen(keyname), NULL);
+    RedisModuleString *expire = RedisModule_CreateStringPrintf(ctx, "%lld", RedisModule_GetAbsExpire(kp));
+    RedisModule_DictReplaceC(removed_expiry_log, (void*)keyname, strlen(keyname), (void *)expire);
+    if (prevexpire != NULL) {
+        RedisModule_FreeString(ctx, prevexpire);
+    }
+}
+
+static int cmdIsKeyRemoved(RedisModuleCtx *ctx, RedisModuleString **argv, int argc){
+    if(argc != 2){
+        return RedisModule_WrongArity(ctx);
+    }
+
+    const char *key  = RedisModule_StringPtrLen(argv[1], NULL);
+
+    RedisModuleString *value = RedisModule_DictGetC(removed_event_log, (void*)key, strlen(key), NULL);
+
+    if (value == NULL) {
+        return RedisModule_ReplyWithError(ctx, "ERR Key was not removed");
+    }
+
+    const char *subevent = RedisModule_DictGetC(removed_subevent_type, (void*)key, strlen(key), NULL);
+    RedisModule_ReplyWithArray(ctx, 2);
+    RedisModule_ReplyWithString(ctx, value);
+    RedisModule_ReplyWithSimpleString(ctx, subevent);
+
+    return REDISMODULE_OK;
+}
+
+static int cmdKeyExpiry(RedisModuleCtx *ctx, RedisModuleString **argv, int argc){
+    if(argc != 2){
+        return RedisModule_WrongArity(ctx);
+    }
+
+    const char* key  = RedisModule_StringPtrLen(argv[1], NULL);
+    RedisModuleString *expire = RedisModule_DictGetC(removed_expiry_log, (void*)key, strlen(key), NULL);
+    if (expire == NULL) {
+        return RedisModule_ReplyWithError(ctx, "ERR Key was not removed");
+    }
+    RedisModule_ReplyWithString(ctx, expire);
+    return REDISMODULE_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) {
+#define VerifySubEventSupported(e, s) \
+    if (!RedisModule_IsSubEventSupported(e, s)) { \
+        return REDISMODULE_ERR; \
+    }
+
+    if (RedisModule_Init(ctx,"testhook",1,REDISMODULE_APIVER_1)
+        == REDISMODULE_ERR) return REDISMODULE_ERR;
+
+    /* Example on how to check if a server sub event is supported */
+    if (!RedisModule_IsSubEventSupported(RedisModuleEvent_ReplicationRoleChanged, REDISMODULE_EVENT_REPLROLECHANGED_NOW_MASTER)) {
+        return REDISMODULE_ERR;
+    }
+
+    /* replication related hooks */
+    RedisModule_SubscribeToServerEvent(ctx,
+        RedisModuleEvent_ReplicationRoleChanged, roleChangeCallback);
+    RedisModule_SubscribeToServerEvent(ctx,
+        RedisModuleEvent_ReplicaChange, replicationChangeCallback);
+    RedisModule_SubscribeToServerEvent(ctx,
+        RedisModuleEvent_MasterLinkChange, rasterLinkChangeCallback);
+
+    /* persistence related hooks */
+    RedisModule_SubscribeToServerEvent(ctx,
+        RedisModuleEvent_Persistence, persistenceCallback);
+    RedisModule_SubscribeToServerEvent(ctx,
+        RedisModuleEvent_Loading, loadingCallback);
+    RedisModule_SubscribeToServerEvent(ctx,
+        RedisModuleEvent_LoadingProgress, loadingProgressCallback);
+
+    /* other hooks */
+    RedisModule_SubscribeToServerEvent(ctx,
+        RedisModuleEvent_ClientChange, clientChangeCallback);
+    RedisModule_SubscribeToServerEvent(ctx,
+        RedisModuleEvent_FlushDB, flushdbCallback);
+    RedisModule_SubscribeToServerEvent(ctx,
+        RedisModuleEvent_Shutdown, shutdownCallback);
+    RedisModule_SubscribeToServerEvent(ctx,
+        RedisModuleEvent_CronLoop, cronLoopCallback);
+
+    RedisModule_SubscribeToServerEvent(ctx,
+        RedisModuleEvent_ModuleChange, moduleChangeCallback);
+    RedisModule_SubscribeToServerEvent(ctx,
+        RedisModuleEvent_SwapDB, swapDbCallback);
+
+    RedisModule_SubscribeToServerEvent(ctx,
+        RedisModuleEvent_Config, configChangeCallback);
+
+    RedisModule_SubscribeToServerEvent(ctx,
+        RedisModuleEvent_Key, keyInfoCallback);
+
+    event_log = RedisModule_CreateDict(ctx);
+    removed_event_log = RedisModule_CreateDict(ctx);
+    removed_subevent_type = RedisModule_CreateDict(ctx);
+    removed_expiry_log = RedisModule_CreateDict(ctx);
+
+    if (RedisModule_CreateCommand(ctx,"hooks.event_count", cmdEventCount,"",0,0,0) == REDISMODULE_ERR)
+        return REDISMODULE_ERR;
+    if (RedisModule_CreateCommand(ctx,"hooks.event_last", cmdEventLast,"",0,0,0) == REDISMODULE_ERR)
+        return REDISMODULE_ERR;
+    if (RedisModule_CreateCommand(ctx,"hooks.clear", cmdEventsClear,"",0,0,0) == REDISMODULE_ERR)
+        return REDISMODULE_ERR;
+    if (RedisModule_CreateCommand(ctx,"hooks.is_key_removed", cmdIsKeyRemoved,"",0,0,0) == REDISMODULE_ERR)
+        return REDISMODULE_ERR;
+    if (RedisModule_CreateCommand(ctx,"hooks.pexpireat", cmdKeyExpiry,"",0,0,0) == REDISMODULE_ERR)
+        return REDISMODULE_ERR;
+
+    if (argc == 1) {
+        const char *ptr = RedisModule_StringPtrLen(argv[0], NULL);
+        if (!strcasecmp(ptr, "noload")) {
+            /* This is a hint that we return ERR at the last moment of OnLoad. */
+            RedisModule_FreeDict(ctx, event_log);
+            RedisModule_FreeDict(ctx, removed_event_log);
+            RedisModule_FreeDict(ctx, removed_subevent_type);
+            RedisModule_FreeDict(ctx, removed_expiry_log);
+            return REDISMODULE_ERR;
+        }
+    }
+
+    return REDISMODULE_OK;
+}
+
+int RedisModule_OnUnload(RedisModuleCtx *ctx) {
+    clearEvents(ctx);
+    RedisModule_FreeDict(ctx, event_log);
+    event_log = NULL;
+
+    RedisModuleDictIter *iter = RedisModule_DictIteratorStartC(removed_event_log, "^", NULL, 0);
+    char* key;
+    size_t keyLen;
+    RedisModuleString* val;
+    while((key = RedisModule_DictNextC(iter, &keyLen, (void**)&val))){
+        RedisModule_FreeString(ctx, val);
+    }
+    RedisModule_FreeDict(ctx, removed_event_log);
+    RedisModule_DictIteratorStop(iter);
+    removed_event_log = NULL;
+
+    RedisModule_FreeDict(ctx, removed_subevent_type);
+    removed_subevent_type = NULL;
+
+    iter = RedisModule_DictIteratorStartC(removed_expiry_log, "^", NULL, 0);
+    while((key = RedisModule_DictNextC(iter, &keyLen, (void**)&val))){
+        RedisModule_FreeString(ctx, val);
+    }
+    RedisModule_FreeDict(ctx, removed_expiry_log);
+    RedisModule_DictIteratorStop(iter);
+    removed_expiry_log = NULL;
+
+    return REDISMODULE_OK;
+}
+