c6c0155725
This cleans up and simplifies the API by passing the command name as the first argument. Previously the command name was specified explicitly, but was still included in the argv. (cherry picked from commit a94ddb27fe919d60c598c2403b230b27c6e3a11c)
123 lines
3.5 KiB
C
123 lines
3.5 KiB
C
#define REDISMODULE_EXPERIMENTAL_API
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#include "redismodule.h"
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#include <strings.h>
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#include <assert.h>
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#include <unistd.h>
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#include <errno.h>
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#define UNUSED(V) ((void) V)
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/* A sample movable keys command that returns a list of all
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* arguments that follow a KEY argument, i.e.
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*/
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int getkeys_command(RedisModuleCtx *ctx, RedisModuleString **argv, int argc)
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{
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int i;
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int count = 0;
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/* Handle getkeys-api introspection */
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if (RedisModule_IsKeysPositionRequest(ctx)) {
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for (i = 0; i < argc; i++) {
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size_t len;
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const char *str = RedisModule_StringPtrLen(argv[i], &len);
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if (len == 3 && !strncasecmp(str, "key", 3) && i + 1 < argc)
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RedisModule_KeyAtPos(ctx, i + 1);
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}
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return REDISMODULE_OK;
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}
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/* Handle real command invocation */
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RedisModule_ReplyWithArray(ctx, REDISMODULE_POSTPONED_ARRAY_LEN);
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for (i = 0; i < argc; i++) {
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size_t len;
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const char *str = RedisModule_StringPtrLen(argv[i], &len);
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if (len == 3 && !strncasecmp(str, "key", 3) && i + 1 < argc) {
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RedisModule_ReplyWithString(ctx, argv[i+1]);
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count++;
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}
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}
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RedisModule_ReplySetArrayLength(ctx, count);
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return REDISMODULE_OK;
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}
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int getkeys_fixed(RedisModuleCtx *ctx, RedisModuleString **argv, int argc)
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{
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int i;
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RedisModule_ReplyWithArray(ctx, argc - 1);
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for (i = 1; i < argc; i++) {
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RedisModule_ReplyWithString(ctx, argv[i]);
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}
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return REDISMODULE_OK;
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}
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/* Introspect a command using RM_GetCommandKeys() and returns the list
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* of keys. Essentially this is COMMAND GETKEYS implemented in a module.
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*/
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int getkeys_introspect(RedisModuleCtx *ctx, RedisModuleString **argv, int argc)
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{
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UNUSED(argv);
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UNUSED(argc);
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if (argc < 3) {
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RedisModule_WrongArity(ctx);
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return REDISMODULE_OK;
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}
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int num_keys;
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int *keyidx = RedisModule_GetCommandKeys(ctx, &argv[1], argc - 1, &num_keys);
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if (!keyidx) {
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if (!errno)
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RedisModule_ReplyWithEmptyArray(ctx);
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else {
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char err[100];
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switch (errno) {
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case ENOENT:
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RedisModule_ReplyWithError(ctx, "ERR ENOENT");
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break;
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case EINVAL:
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RedisModule_ReplyWithError(ctx, "ERR EINVAL");
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break;
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default:
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snprintf(err, sizeof(err) - 1, "ERR errno=%d", errno);
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RedisModule_ReplyWithError(ctx, err);
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break;
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}
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}
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} else {
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int i;
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RedisModule_ReplyWithArray(ctx, num_keys);
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for (i = 0; i < num_keys; i++)
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RedisModule_ReplyWithString(ctx, argv[1 + keyidx[i]]);
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RedisModule_Free(keyidx);
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}
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return REDISMODULE_OK;
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}
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int RedisModule_OnLoad(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) {
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UNUSED(argv);
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UNUSED(argc);
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if (RedisModule_Init(ctx,"getkeys",1,REDISMODULE_APIVER_1)== REDISMODULE_ERR)
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return REDISMODULE_ERR;
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if (RedisModule_CreateCommand(ctx,"getkeys.command", getkeys_command,"getkeys-api",0,0,0) == REDISMODULE_ERR)
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return REDISMODULE_ERR;
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if (RedisModule_CreateCommand(ctx,"getkeys.fixed", getkeys_fixed,"",2,4,1) == REDISMODULE_ERR)
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return REDISMODULE_ERR;
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if (RedisModule_CreateCommand(ctx,"getkeys.introspect", getkeys_introspect,"",0,0,0) == REDISMODULE_ERR)
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return REDISMODULE_ERR;
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return REDISMODULE_OK;
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}
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