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Correctly handle scripts with shebang (not read-only) on a cluster replica (#11223) 

EVAL scripts are by default not considered `write` commands, so they were allowed on a replica.
But when adding a shebang, they become `write` command (unless the `no-writes` flag is added).
With this change we'll handle them as write commands, and reply with MOVED instead of
READONLY when executed on a redis cluster replica.

Co-authored-by: chendianqiang <chendianqiang@meituan.com>
This commit is contained in:
chendianqiang 2022-09-05 21:59:14 +08:00 committed by GitHub
parent 87e7973c7e
commit e42d98ed27
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 12 additions and 3 deletions
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7
src/cluster.c
View File

@ -6797,6 +6797,7 @@ clusterNode *getNodeByQuery(client *c, struct redisCommand *cmd, robj **argv, in
* without redirections or errors in all the cases. */
if (n == NULL) return myself;
uint64_t cmd_flags = getCommandFlags(c);
/* Cluster is globally down but we got keys? We only serve the request
* if it is a read command and when allow_reads_when_down is enabled. */
if (server.cluster->state != CLUSTER_OK) {
@ -6810,7 +6811,7 @@ clusterNode *getNodeByQuery(client *c, struct redisCommand *cmd, robj **argv, in
* cluster is down. */
if (error_code) *error_code = CLUSTER_REDIR_DOWN_STATE;
return NULL;
} else if (cmd->flags & CMD_WRITE) {
} else if (cmd_flags & CMD_WRITE) {
/* The cluster is configured to allow read only commands */
if (error_code) *error_code = CLUSTER_REDIR_DOWN_RO_STATE;
return NULL;
@ -6848,7 +6849,7 @@ clusterNode *getNodeByQuery(client *c, struct redisCommand *cmd, robj **argv, in
* involves multiple keys and we don't have them all, the only option is
* to send a TRYAGAIN error. */
if (importing_slot &&
(c->flags & CLIENT_ASKING || cmd->flags & CMD_ASKING))
(c->flags & CLIENT_ASKING || cmd_flags & CMD_ASKING))
{
if (multiple_keys && missing_keys) {
if (error_code) *error_code = CLUSTER_REDIR_UNSTABLE;
@ -6861,7 +6862,7 @@ clusterNode *getNodeByQuery(client *c, struct redisCommand *cmd, robj **argv, in
/* Handle the read-only client case reading from a slave: if this
* node is a slave and the request is about a hash slot our master
* is serving, we can reply without redirection. */
int is_write_command = (c->cmd->flags & CMD_WRITE) ||
int is_write_command = (cmd_flags & CMD_WRITE) ||
(c->cmd->proc == execCommand && (c->mstate.cmd_flags & CMD_WRITE));
if (((c->flags & CLIENT_READONLY) || is_pubsubshard) &&
!is_write_command &&

8
tests/cluster/tests/16-transactions-on-replica.tcl
View File

@ -69,3 +69,11 @@ test "read-only blocking operations from replica" {
assert {$res eq {foo bar}}
$rd close
}
test "reply MOVED when eval from replica for update" {
catch {[$replica eval {#!lua
return redis.call('del','a')
} 1 a
]} err
assert {[string range $err 0 4] eq {MOVED}}
}