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#include "redismodule.h"
#include <strings.h>
#include <errno.h>
#include <stdlib.h>
/* If a string is ":deleted:", the special value for deleted hash fields is
* returned; otherwise the input string is returned. */
static RedisModuleString *value_or_delete(RedisModuleString *s) {
if (!strcasecmp(RedisModule_StringPtrLen(s, NULL), ":delete:"))
return REDISMODULE_HASH_DELETE;
else
return s;
}
/* HASH.SET key flags field1 value1 [field2 value2 ..]
*
* Sets 1-4 fields. Returns the same as RedisModule_HashSet().
* Flags is a string of "nxa" where n = NX, x = XX, a = COUNT_ALL.
* To delete a field, use the value ":delete:".
*/
int hash_set(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) {
if (argc < 5 || argc % 2 == 0 || argc > 11)
return RedisModule_WrongArity(ctx);
RedisModule_AutoMemory(ctx);
RedisModuleKey *key = RedisModule_OpenKey(ctx, argv[1], REDISMODULE_WRITE);
size_t flags_len;
const char *flags_str = RedisModule_StringPtrLen(argv[2], &flags_len);
int flags = REDISMODULE_HASH_NONE;
for (size_t i = 0; i < flags_len; i++) {
switch (flags_str[i]) {
case 'n': flags |= REDISMODULE_HASH_NX; break;
case 'x': flags |= REDISMODULE_HASH_XX; break;
case 'a': flags |= REDISMODULE_HASH_COUNT_ALL; break;
}
}
/* Test some varargs. (In real-world, use a loop and set one at a time.) */
int result;
errno = 0;
if (argc == 5) {
result = RedisModule_HashSet(key, flags,
argv[3], value_or_delete(argv[4]),
NULL);
} else if (argc == 7) {
result = RedisModule_HashSet(key, flags,
argv[3], value_or_delete(argv[4]),
argv[5], value_or_delete(argv[6]),
NULL);
} else if (argc == 9) {
result = RedisModule_HashSet(key, flags,
argv[3], value_or_delete(argv[4]),
argv[5], value_or_delete(argv[6]),
argv[7], value_or_delete(argv[8]),
NULL);
} else if (argc == 11) {
result = RedisModule_HashSet(key, flags,
argv[3], value_or_delete(argv[4]),
argv[5], value_or_delete(argv[6]),
argv[7], value_or_delete(argv[8]),
argv[9], value_or_delete(argv[10]),
NULL);
} else {
return RedisModule_ReplyWithError(ctx, "ERR too many fields");
}
/* Check errno */
if (result == 0) {
if (errno == ENOTSUP)
return RedisModule_ReplyWithError(ctx, REDISMODULE_ERRORMSG_WRONGTYPE);
else
RedisModule_Assert(errno == ENOENT);
}
return RedisModule_ReplyWithLongLong(ctx, result);
}
int RedisModule_OnLoad(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) {
REDISMODULE_NOT_USED(argv);
REDISMODULE_NOT_USED(argc);
if (RedisModule_Init(ctx, "hash", 1, REDISMODULE_APIVER_1) ==
REDISMODULE_OK &&
RedisModule_CreateCommand(ctx, "hash.set", hash_set, "write",
1, 1, 1) == REDISMODULE_OK) {
return REDISMODULE_OK;
} else {
return REDISMODULE_ERR;
}
}
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