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ruanhaishen
redis
Commits
828a87ba
Commit
828a87ba
authored
Nov 10, 2015
by
antirez
Browse files
call() deserves a good top-comment.
parent
7a7732cf
Changes
1
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src/server.c
View file @
828a87ba
...
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@@ -2142,7 +2142,43 @@ void preventCommandReplication(client *c) {
c->flags |= CLIENT_PREVENT_REPL_PROP;
}
/* Call() is the core of Redis execution of a command */
/* Call() is the core of Redis execution of a command.
*
* The following flags can be passed:
* CMD_CALL_NONE No flags.
* CMD_CALL_SLOWLOG Check command speed and log in the slow log if needed.
* CMD_CALL_STATS Populate command stats.
* CMD_CALL_PROPAGATE_AOF Append command to AOF if it modified the dataset
* or if the client flags are forcing propagation.
* CMD_CALL_PROPAGATE_REPL Send command to salves if it modified the dataset
* or if the client flags are forcing propagation.
* CMD_CALL_PROPAGATE Alias for PROPAGATE_AOF|PROPAGATE_REPL.
* CMD_CALL_FULL Alias for SLOWLOG|STATS|PROPAGATE.
*
* The exact propagation behavior depends on the client flags.
* Specifically:
*
* 1. If the client flags CLIENT_FORCE_AOF or CLIENT_FORCE_REPL are set
* and assuming the corresponding CMD_CALL_PROPAGATE_AOF/REPL is set
* in the call flags, then the command is propagated even if the
* dataset was not affected by the command.
* 2. If the client flags CLIENT_PREVENT_REPL_PROP or CLIENT_PREVENT_AOF_PROP
* are set, the propagation into AOF or to slaves is not performed even
* if the command modified the dataset.
*
* Note that regardless of the client flags, if CMD_CALL_PROPAGATE_AOF
* or CMD_CALL_PROPAGATE_REPL are not set, then respectively AOF or
* slaves propagation will never occur.
*
* Client flags are modified by the implementation of a given command
* using the following API:
*
* forceCommandPropagation(client *c, int flags);
* preventCommandPropagation(client *c);
* preventCommandAOF(client *c);
* preventCommandReplication(client *c);
*
*/
void call(client *c, int flags) {
long long dirty, start, duration;
int client_old_flags = c->flags;
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@@ -2207,7 +2243,7 @@ void call(client *c, int flags) {
* set for replication / AOF propagation. */
if (dirty) propagate_flags |= (PROPAGATE_AOF|PROPAGATE_REPL);
/* If the c
ommand
forced AOF / replication of the command, set
/* If the c
lient
forced AOF / replication of the command, set
* the flags regardless of the command effects on the data set. */
if (c->flags & CLIENT_FORCE_REPL) propagate_flags |= PROPAGATE_REPL;
if (c->flags & CLIENT_FORCE_AOF) propagate_flags |= PROPAGATE_AOF;
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