void RMUtil_SCAN(RedisModuleCtx *ctx, const char *pattern, RedisModuleString **keys, size_t *key_count) {
int scan_idx = 0; /* SCAN cursor. */
size_t total_keys = 0; /* Number of keys retrieved. */
RedisModuleCallReply *reply;
/* Consume SCAN */
do {
reply = RedisModule_Call(ctx, "SCAN", "lcc", scan_idx, "MATCH", pattern);
/* First element is the scan cursor, 0 indicates end of SCAN. */
RedisModuleCallReply *element = RedisModule_CallReplyArrayElement(reply, 0);
scan_idx = RedisModule_CallReplyInteger(element);
/* Process SCAN results. */
RedisModuleCallReply *scan_results = RedisModule_CallReplyArrayElement(reply, 1);
/* Number of elements in replay. */
size_t keys_count = RedisModule_CallReplyLength(scan_results);
/* Extract SCAN result elements. */
for(int idx = 0; idx < keys_count && *key_count > total_keys; idx++) {
element = RedisModule_CallReplyArrayElement(scan_results, idx);
RedisModuleString *key = RedisModule_CreateStringFromCallReply(element);
keys[total_keys] = key;
total_keys++;
}
RedisModule_FreeCallReply(reply);
} while(scan_idx != 0);
/* Update number of stores fetched. */
*key_count = total_keys;
}
RMUtilInfo *RMUtil_HGetAll(RedisModuleCtx *ctx, RedisModuleString *id) {
RedisModuleCallReply *reply = RedisModule_Call(ctx, "HGETALL", "s", id);
if(RedisModule_CallReplyType(reply) != REDISMODULE_REPLY_ARRAY) {
printf("ERROE expecting an array \n");
return NULL;
}
size_t reply_len = RedisModule_CallReplyLength(reply);
RMUtilInfo *hgetall = malloc(sizeof(RMUtilInfo));
hgetall->numEntries = reply_len/2;
hgetall->entries = malloc(sizeof(RMUtilInfoEntry) * hgetall->numEntries);
// Consume HGETALL
for(int idx = 0; idx < reply_len; idx+=2) {
RedisModuleCallReply *subreply;
subreply = RedisModule_CallReplyArrayElement(reply, idx);
size_t len;
char *key = strdup(RedisModule_CallReplyStringPtr(subreply, &len));
key[len] = 0;
hgetall->entries[idx/2].key = key;
subreply = RedisModule_CallReplyArrayElement(reply, idx+1);
char *val = strdup(RedisModule_CallReplyStringPtr(subreply, &len));
val[len] = 0;
hgetall->entries[idx/2].val = val;
}
RedisModule_FreeCallReply(reply);
return hgetall;
}
/* HELLO.PUSH.CALL2
* This is exaxctly as HELLO.PUSH.CALL, but shows how we can reply to the
* client using directly a reply object that Call() returned. */
int HelloPushCall2_RedisCommand(RedisModuleCtx *ctx, RedisModuleString **argv, int argc)
{
if (argc != 3) return RedisModule_WrongArity(ctx);
RedisModuleCallReply *reply;
reply = RedisModule_Call(ctx,"RPUSH","ss",argv[1],argv[2]);
RedisModule_ReplyWithCallReply(ctx,reply);
RedisModule_FreeCallReply(reply);
return REDISMODULE_OK;
}
/* HELLO.LIST.SUM.LEN returns the total length of all the items inside
* a Redis list, by using the high level Call() API.
* This command is an example of the array reply access. */
int HelloListSumLen_RedisCommand(RedisModuleCtx *ctx, RedisModuleString **argv, int argc)
{
if (argc != 2) return RedisModule_WrongArity(ctx);
RedisModuleCallReply *reply;
reply = RedisModule_Call(ctx,"LRANGE","sll",argv[1],(long long)0,(long long)-1);
size_t strlen = 0;
size_t items = RedisModule_CallReplyLength(reply);
size_t j;
for (j = 0; j < items; j++) {
RedisModuleCallReply *ele = RedisModule_CallReplyArrayElement(reply,j);
strlen += RedisModule_CallReplyLength(ele);
}
RedisModule_FreeCallReply(reply);
RedisModule_ReplyWithLongLong(ctx,strlen);
return REDISMODULE_OK;
}