/* Emit the commands needed to rebuild a hash object. * The function returns 0 on error, 1 on success. */ int rewriteHashObject(rio *r, robj *key, robj *o) { hashTypeIterator *hi; long long count = 0, items = hashTypeLength(o); hi = hashTypeInitIterator(o); while (hashTypeNext(hi) != REDIS_ERR) { if (count == 0) { int cmd_items = (items > REDIS_AOF_REWRITE_ITEMS_PER_CMD) ? REDIS_AOF_REWRITE_ITEMS_PER_CMD : items; if (rioWriteBulkCount(r,'*',2+cmd_items*2) == 0) return 0; if (rioWriteBulkString(r,"HMSET",5) == 0) return 0; if (rioWriteBulkObject(r,key) == 0) return 0; } if (rioWriteHashIteratorCursor(r, hi, REDIS_HASH_KEY) == 0) return 0; if (rioWriteHashIteratorCursor(r, hi, REDIS_HASH_VALUE) == 0) return 0; if (++count == REDIS_AOF_REWRITE_ITEMS_PER_CMD) count = 0; items--; } hashTypeReleaseIterator(hi); return 1; }
/* Add an element, discard the old if the key already exists. * Return 0 on insert and 1 on update. * This function will take care of incrementing the reference count of the * retained fields and value objects. */ int hashTypeSet(robj *o, robj *field, robj *value) { int update = 0; if (o->encoding == REDIS_ENCODING_ZIPLIST) { unsigned char *zl, *fptr, *vptr; field = getDecodedObject(field); value = getDecodedObject(value); zl = o->ptr; fptr = ziplistIndex(zl, ZIPLIST_HEAD); if (fptr != NULL) { fptr = ziplistFind(fptr, field->ptr, sdslen(field->ptr), 1); if (fptr != NULL) { /* Grab pointer to the value (fptr points to the field) */ vptr = ziplistNext(zl, fptr); logicErrorExpr(vptr != NULL, "Never happend"); update = 1; /* Delete value */ zl = ziplistDelete(zl, &vptr); /* Insert new value */ zl = ziplistInsert(zl, vptr, value->ptr, sdslen(value->ptr)); } } if (!update) { /* Push new field/value pair onto the tail of the ziplist */ zl = ziplistPush(zl, field->ptr, sdslen(field->ptr), ZIPLIST_TAIL); zl = ziplistPush(zl, value->ptr, sdslen(value->ptr), ZIPLIST_TAIL); } o->ptr = zl; decrRefCount(field); decrRefCount(value); /* Check if the ziplist needs to be converted to a hash table */ if (hashTypeLength(o) > server.hash_max_ziplist_entries) hashTypeConvert(o, REDIS_ENCODING_HT); } else if (o->encoding == REDIS_ENCODING_HT) { if (dictReplace(o->ptr, field, value)) { /* Insert */ incrRefCount(field); } else { /* Update */ update = 1; } incrRefCount(value); } else { logicError("Unknown hash encoding"); } return update; }