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http://github.com/valkey-io/valkey
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0bc8c9c8f9
The added flag affects the return value of RM_HashSet() to include the number of inserted fields, in addition to updated and deleted fields. errno is set on errors, tests are added and documentation updated.
91 lines
3.4 KiB
C
91 lines
3.4 KiB
C
#include "redismodule.h"
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#include <strings.h>
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#include <errno.h>
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#include <stdlib.h>
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/* If a string is ":deleted:", the special value for deleted hash fields is
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* returned; otherwise the input string is returned. */
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static RedisModuleString *value_or_delete(RedisModuleString *s) {
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if (!strcasecmp(RedisModule_StringPtrLen(s, NULL), ":delete:"))
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return REDISMODULE_HASH_DELETE;
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else
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return s;
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}
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/* HASH.SET key flags field1 value1 [field2 value2 ..]
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*
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* Sets 1-4 fields. Returns the same as RedisModule_HashSet().
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* Flags is a string of "nxa" where n = NX, x = XX, a = COUNT_ALL.
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* To delete a field, use the value ":delete:".
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*/
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int hash_set(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) {
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if (argc < 5 || argc % 2 == 0 || argc > 11)
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return RedisModule_WrongArity(ctx);
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RedisModule_AutoMemory(ctx);
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RedisModuleKey *key = RedisModule_OpenKey(ctx, argv[1], REDISMODULE_WRITE);
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size_t flags_len;
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const char *flags_str = RedisModule_StringPtrLen(argv[2], &flags_len);
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int flags = REDISMODULE_HASH_NONE;
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for (size_t i = 0; i < flags_len; i++) {
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switch (flags_str[i]) {
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case 'n': flags |= REDISMODULE_HASH_NX; break;
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case 'x': flags |= REDISMODULE_HASH_XX; break;
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case 'a': flags |= REDISMODULE_HASH_COUNT_ALL; break;
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}
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}
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/* Test some varargs. (In real-world, use a loop and set one at a time.) */
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int result;
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errno = 0;
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if (argc == 5) {
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result = RedisModule_HashSet(key, flags,
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argv[3], value_or_delete(argv[4]),
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NULL);
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} else if (argc == 7) {
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result = RedisModule_HashSet(key, flags,
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argv[3], value_or_delete(argv[4]),
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argv[5], value_or_delete(argv[6]),
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NULL);
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} else if (argc == 9) {
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result = RedisModule_HashSet(key, flags,
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argv[3], value_or_delete(argv[4]),
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argv[5], value_or_delete(argv[6]),
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argv[7], value_or_delete(argv[8]),
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NULL);
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} else if (argc == 11) {
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result = RedisModule_HashSet(key, flags,
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argv[3], value_or_delete(argv[4]),
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argv[5], value_or_delete(argv[6]),
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argv[7], value_or_delete(argv[8]),
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argv[9], value_or_delete(argv[10]),
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NULL);
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} else {
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return RedisModule_ReplyWithError(ctx, "ERR too many fields");
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}
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/* Check errno */
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if (result == 0) {
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if (errno == ENOTSUP)
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return RedisModule_ReplyWithError(ctx, REDISMODULE_ERRORMSG_WRONGTYPE);
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else
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RedisModule_Assert(errno == ENOENT);
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}
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return RedisModule_ReplyWithLongLong(ctx, result);
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}
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int RedisModule_OnLoad(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) {
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REDISMODULE_NOT_USED(argv);
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REDISMODULE_NOT_USED(argc);
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if (RedisModule_Init(ctx, "hash", 1, REDISMODULE_APIVER_1) ==
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REDISMODULE_OK &&
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RedisModule_CreateCommand(ctx, "hash.set", hash_set, "",
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1, 1, 1) == REDISMODULE_OK) {
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return REDISMODULE_OK;
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} else {
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return REDISMODULE_ERR;
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}
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}
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