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Added keyspace miss notifications support

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This commit is contained in:
Dvir Volk 2019-03-19 13:11:37 +02:00
parent 3eaa2cdc44
commit 8620a434a0
2 changed files with 28 additions and 8 deletions
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7
src/db.c
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@ -83,6 +83,7 @@ robj *lookupKey(redisDb *db, robj *key, int flags) {
* 1. A key gets expired if it reached it's TTL.
* 2. The key last access time is updated.
* 3. The global keys hits/misses stats are updated (reported in INFO).
* 4. If keyspace notifications are enabled, a "miss" notification is fired.
*
* This API should not be used when we write to the key after obtaining
* the object linked to the key, but only for read only operations.
@ -106,6 +107,7 @@ robj *lookupKeyReadWithFlags(redisDb *db, robj *key, int flags) {
* to return NULL ASAP. */
if (server.masterhost == NULL) {
server.stat_keyspace_misses++;
notifyKeyspaceEvent(NOTIFY_GENERIC, "miss", key, db->id);
return NULL;
}
@ -127,12 +129,15 @@ robj *lookupKeyReadWithFlags(redisDb *db, robj *key, int flags) {
server.current_client->cmd->flags & CMD_READONLY)
{
server.stat_keyspace_misses++;
notifyKeyspaceEvent(NOTIFY_GENERIC, "miss", key, db->id);
return NULL;
}
}
val = lookupKey(db,key,flags);
if (val == NULL)
if (val == NULL) {
server.stat_keyspace_misses++;
notifyKeyspaceEvent(NOTIFY_GENERIC, "miss", key, db->id);
}
else
server.stat_keyspace_hits++;
return val;

17
src/modules/testmodule.c
View File

@ -188,6 +188,10 @@ int TestNotifications(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) {
RedisModule_Call(ctx, "LPUSH", "cc", "l", "y");
RedisModule_Call(ctx, "LPUSH", "cc", "l", "y");
/* Miss some keys intentionally so we will get a "miss" notification. */
RedisModule_Call(ctx, "GET", "c", "nosuchkey");
RedisModule_Call(ctx, "SMEMBERS", "c", "nosuchkey");
size_t sz;
const char *rep;
RedisModuleCallReply *r = RedisModule_Call(ctx, "HGET", "cc", "notifications", "foo");
@ -225,6 +229,16 @@ int TestNotifications(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) {
FAIL("Wrong reply for l");
}
r = RedisModule_Call(ctx, "HGET", "cc", "notifications", "nosuchkey");
if (r == NULL || RedisModule_CallReplyType(r) != REDISMODULE_REPLY_STRING) {
FAIL("Wrong or no reply for nosuchkey");
} else {
rep = RedisModule_CallReplyStringPtr(r, &sz);
if (sz != 1 || *rep != '2') {
FAIL("Got reply '%.*s'. expected '2'", sz, rep);
}
}
RedisModule_Call(ctx, "FLUSHDB", "");
return RedisModule_ReplyWithSimpleString(ctx, "OK");
@ -435,7 +449,8 @@ int RedisModule_OnLoad(RedisModuleCtx *ctx, RedisModuleString **argv, int argc)
RedisModule_SubscribeToKeyspaceEvents(ctx,
REDISMODULE_NOTIFY_HASH |
REDISMODULE_NOTIFY_SET |
REDISMODULE_NOTIFY_STRING,
REDISMODULE_NOTIFY_STRING |
REDISMODULE_NOTIFY_GENERIC,
NotifyCallback);
if (RedisModule_CreateCommand(ctx,"test.notify",
TestNotifications,"write deny-oom",1,1,1) == REDISMODULE_ERR)