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Fix module commands propagation double MULTI bug.

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37a10cef introduced automatic wrapping of MULTI/EXEC for the
alsoPropagate API. However this collides with the built-in mechanism
already present in module.c. To avoid complex changes near Redis 6 GA
this commit introduces the ability to exclude call() MUTLI/EXEC wrapping
for also propagate in order to continue to use the old code paths in
module.c.
This commit is contained in:
antirez 2020-03-31 11:00:45 +02:00
parent 7698316fda
commit 9dcf878f1b
4 changed files with 25 additions and 8 deletions
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7
src/module.c
View File

@ -3326,13 +3326,8 @@ RedisModuleCallReply *RM_Call(RedisModuleCtx *ctx, const char *cmdname, const ch
* a Lua script in the context of AOF and slaves. */
if (replicate) moduleReplicateMultiIfNeeded(ctx);
if (ctx->client->flags & CLIENT_MULTI ||
ctx->flags & REDISMODULE_CTX_MULTI_EMITTED) {
c->flags |= CLIENT_MULTI;
}
/* Run the command */
int call_flags = CMD_CALL_SLOWLOG | CMD_CALL_STATS;
int call_flags = CMD_CALL_SLOWLOG | CMD_CALL_STATS | CMD_CALL_NOWRAP;
if (replicate) {
if (!(flags & REDISMODULE_ARGV_NO_AOF))
call_flags |= CMD_CALL_PROPAGATE_AOF;

8
src/server.c
View File

@ -3266,11 +3266,15 @@ void call(client *c, int flags) {
int multi_emitted = 0;
/* Wrap the commands in server.also_propagate array,
* but don't wrap it if we are already in MULIT context,
* in case the nested MULIT/EXEC.
* in case the nested MULTI/EXEC.
*
* And if the array contains only one command, no need to
* wrap it, since the single command is atomic. */
if (server.also_propagate.numops > 1 && !(c->flags & CLIENT_MULTI)) {
if (server.also_propagate.numops > 1 &&
!(c->cmd->flags & CMD_MODULE) &&
!(c->flags & CLIENT_MULTI) &&
!(flags & CMD_CALL_NOWRAP))
{
execCommandPropagateMulti(c);
multi_emitted = 1;
}

2
src/server.h
View File

@ -395,6 +395,8 @@ typedef long long ustime_t; /* microsecond time type. */
#define CMD_CALL_PROPAGATE_REPL (1<<3)
#define CMD_CALL_PROPAGATE (CMD_CALL_PROPAGATE_AOF|CMD_CALL_PROPAGATE_REPL)
#define CMD_CALL_FULL (CMD_CALL_SLOWLOG | CMD_CALL_STATS | CMD_CALL_PROPAGATE)
#define CMD_CALL_NOWRAP (1<<4) /* Don't wrap also propagate array into
MULTI/EXEC: the caller will handle it. */
/* Command propagation flags, see propagate() function */
#define PROPAGATE_NONE 0

16
tests/modules/propagate.c
View File

@ -89,6 +89,16 @@ int propagateTestCommand(RedisModuleCtx *ctx, RedisModuleString **argv, int argc
return REDISMODULE_OK;
}
int propagateTest2Command(RedisModuleCtx *ctx, RedisModuleString **argv, int argc)
{
REDISMODULE_NOT_USED(argv);
REDISMODULE_NOT_USED(argc);
RedisModule_Replicate(ctx,"INCR","c","counter");
RedisModule_ReplyWithSimpleString(ctx,"OK");
return REDISMODULE_OK;
}
int RedisModule_OnLoad(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) {
REDISMODULE_NOT_USED(argv);
REDISMODULE_NOT_USED(argc);
@ -100,5 +110,11 @@ int RedisModule_OnLoad(RedisModuleCtx *ctx, RedisModuleString **argv, int argc)
propagateTestCommand,
"",1,1,1) == REDISMODULE_ERR)
return REDISMODULE_ERR;
if (RedisModule_CreateCommand(ctx,"propagate-test-2",
propagateTest2Command,
"",1,1,1) == REDISMODULE_ERR)
return REDISMODULE_ERR;
return REDISMODULE_OK;
}