valkey/tests/modules/scan.c

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#define REDISMODULE_EXPERIMENTAL_API
#include "redismodule.h"
#include <string.h>
#include <assert.h>
#include <unistd.h>
#define UNUSED(V) ((void) V)
typedef struct scan_pd{
size_t nkeys;
RedisModuleCtx *ctx;
} scan_pd;
void scan_callback(void *privdata, RedisModuleString* keyname, RedisModuleKey* key){
scan_pd* pd = privdata;
RedisModule_ReplyWithArray(pd->ctx, 2);
RedisModule_ReplyWithString(pd->ctx, keyname);
if(key && RedisModule_KeyType(key) == REDISMODULE_KEYTYPE_STRING){
size_t len;
char * data = RedisModule_StringDMA(key, &len, REDISMODULE_READ);
RedisModule_ReplyWithStringBuffer(pd->ctx, data, len);
}else{
RedisModule_ReplyWithNull(pd->ctx);
}
pd->nkeys++;
}
int scan_keys_values(RedisModuleCtx *ctx, RedisModuleString **argv, int argc)
{
scan_pd pd = {
.nkeys = 0,
.ctx = ctx,
};
RedisModule_ReplyWithArray(ctx, REDISMODULE_POSTPONED_ARRAY_LEN);
RedisModuleCursor* cursor = RedisModule_CursorCreate();
while(RedisModule_Scan(ctx, cursor, scan_callback, &pd));
RedisModule_CursorDestroy(cursor);
RedisModule_ReplySetArrayLength(ctx, pd.nkeys);
return 0;
}
int RedisModule_OnLoad(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) {
UNUSED(argv);
UNUSED(argc);
if (RedisModule_Init(ctx, "scan", 1, REDISMODULE_APIVER_1)== REDISMODULE_ERR)
return REDISMODULE_ERR;
if (RedisModule_CreateCommand(ctx, "scan.scankeysvalues", scan_keys_values, "", 0, 0, 0) == REDISMODULE_ERR)
return REDISMODULE_ERR;
return REDISMODULE_OK;
}