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cleanup: move list pop logic to single function (#7997)

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BLPOP when there are elements in the list works in the same way as LPOP
does. Due to this they also does the same repetitive action and logic
for the same is written at two different places. This is a bad code
practice as the one needs the context to change the BLPOP list pop code
as well when the LPOP code gets changed.

Separated the generic logic from LPOP to a function that is being used
by the BLPOP code as well.
This commit is contained in:
Yash Ladha 2020-11-12 14:25:51 +05:30 committed by GitHub
parent a0576bdeea
commit c170365dcf
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 20 additions and 24 deletions
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1
src/server.h
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@ -1793,6 +1793,7 @@ void listTypeDelete(listTypeIterator *iter, listTypeEntry *entry);
void listTypeConvert(robj *subject, int enc);
void unblockClientWaitingData(client *c);
void popGenericCommand(client *c, int where);
void listElementsRemoved(client *c, robj *key, int where, robj *o);
/* MULTI/EXEC/WATCH... */
void unwatchAllKeys(client *c);

43
src/t_list.c
View File

@ -363,26 +363,30 @@ void lsetCommand(client *c) {
}
}
void popGenericCommand(client *c, int where) {
robj *o = lookupKeyWriteOrReply(c,c->argv[1],shared.null[c->resp]);
if (o == NULL || checkType(c,o,OBJ_LIST)) return;
void listElementsRemoved(client *c, robj *key, int where, robj *o) {
char *event = (where == LIST_HEAD) ? "lpop" : "rpop";
robj *value = listTypePop(o,where);
notifyKeyspaceEvent(NOTIFY_LIST, event, key, c->db->id);
if (listTypeLength(o) == 0) {
notifyKeyspaceEvent(NOTIFY_GENERIC, "del", key, c->db->id);
dbDelete(c->db, key);
}
signalModifiedKey(c, c->db, key);
server.dirty++;
}
void popGenericCommand(client *c, int where) {
robj *o = lookupKeyWriteOrReply(c, c->argv[1], shared.null[c->resp]);
if (o == NULL || checkType(c, o, OBJ_LIST))
return;
robj *value = listTypePop(o, where);
if (value == NULL) {
addReplyNull(c);
} else {
char *event = (where == LIST_HEAD) ? "lpop" : "rpop";
addReplyBulk(c,value);
decrRefCount(value);
notifyKeyspaceEvent(NOTIFY_LIST,event,c->argv[1],c->db->id);
if (listTypeLength(o) == 0) {
notifyKeyspaceEvent(NOTIFY_GENERIC,"del",
c->argv[1],c->db->id);
dbDelete(c->db,c->argv[1]);
}
signalModifiedKey(c,c->db,c->argv[1]);
server.dirty++;
listElementsRemoved(c,c->argv[1],where,o);
}
}
@ -859,7 +863,6 @@ void blockingPopGenericCommand(client *c, int where) {
} else {
if (listTypeLength(o) != 0) {
/* Non empty list, this is like a normal [LR]POP. */
char *event = (where == LIST_HEAD) ? "lpop" : "rpop";
robj *value = listTypePop(o,where);
serverAssert(value != NULL);
@ -867,15 +870,7 @@ void blockingPopGenericCommand(client *c, int where) {
addReplyBulk(c,c->argv[j]);
addReplyBulk(c,value);
decrRefCount(value);
notifyKeyspaceEvent(NOTIFY_LIST,event,
c->argv[j],c->db->id);
if (listTypeLength(o) == 0) {
dbDelete(c->db,c->argv[j]);
notifyKeyspaceEvent(NOTIFY_GENERIC,"del",
c->argv[j],c->db->id);
}
signalModifiedKey(c,c->db,c->argv[j]);
server.dirty++;
listElementsRemoved(c,c->argv[j],where,o);
/* Replicate it as an [LR]POP instead of B[LR]POP. */
rewriteClientCommandVector(c,2,