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// SPDX-FileCopyrightText: 2024 Redict Contributors
// SPDX-FileCopyrightText: 2024 Salvatore Sanfilippo <antirez at gmail dot com>
//
// SPDX-License-Identifier: BSD-3-Clause
// SPDX-License-Identifier: LGPL-3.0-only
#include "redictmodule.h"
#include <strings.h>
#include <assert.h>
#include <unistd.h>
#include <errno.h>
#define UNUSED(V) ((void) V)
/* A sample movable keys command that returns a list of all
* arguments that follow a KEY argument, i.e.
*/
int getkeys_command(RedictModuleCtx *ctx, RedictModuleString **argv, int argc)
{
int i;
int count = 0;
/* Handle getkeys-api introspection */
if (RedictModule_IsKeysPositionRequest(ctx)) {
for (i = 0; i < argc; i++) {
size_t len;
const char *str = RedictModule_StringPtrLen(argv[i], &len);
if (len == 3 && !strncasecmp(str, "key", 3) && i + 1 < argc)
RedictModule_KeyAtPos(ctx, i + 1);
}
return REDICTMODULE_OK;
}
/* Handle real command invocation */
RedictModule_ReplyWithArray(ctx, REDICTMODULE_POSTPONED_LEN);
for (i = 0; i < argc; i++) {
size_t len;
const char *str = RedictModule_StringPtrLen(argv[i], &len);
if (len == 3 && !strncasecmp(str, "key", 3) && i + 1 < argc) {
RedictModule_ReplyWithString(ctx, argv[i+1]);
count++;
}
}
RedictModule_ReplySetArrayLength(ctx, count);
return REDICTMODULE_OK;
}
int getkeys_command_with_flags(RedictModuleCtx *ctx, RedictModuleString **argv, int argc)
{
int i;
int count = 0;
/* Handle getkeys-api introspection */
if (RedictModule_IsKeysPositionRequest(ctx)) {
for (i = 0; i < argc; i++) {
size_t len;
const char *str = RedictModule_StringPtrLen(argv[i], &len);
if (len == 3 && !strncasecmp(str, "key", 3) && i + 1 < argc)
RedictModule_KeyAtPosWithFlags(ctx, i + 1, REDICTMODULE_CMD_KEY_RO | REDICTMODULE_CMD_KEY_ACCESS);
}
return REDICTMODULE_OK;
}
/* Handle real command invocation */
RedictModule_ReplyWithArray(ctx, REDICTMODULE_POSTPONED_LEN);
for (i = 0; i < argc; i++) {
size_t len;
const char *str = RedictModule_StringPtrLen(argv[i], &len);
if (len == 3 && !strncasecmp(str, "key", 3) && i + 1 < argc) {
RedictModule_ReplyWithString(ctx, argv[i+1]);
count++;
}
}
RedictModule_ReplySetArrayLength(ctx, count);
return REDICTMODULE_OK;
}
int getkeys_fixed(RedictModuleCtx *ctx, RedictModuleString **argv, int argc)
{
int i;
RedictModule_ReplyWithArray(ctx, argc - 1);
for (i = 1; i < argc; i++) {
RedictModule_ReplyWithString(ctx, argv[i]);
}
return REDICTMODULE_OK;
}
/* Introspect a command using RM_GetCommandKeys() and returns the list
* of keys. Essentially this is COMMAND GETKEYS implemented in a module.
* INTROSPECT <with-flags> <cmd> <args>
*/
int getkeys_introspect(RedictModuleCtx *ctx, RedictModuleString **argv, int argc)
{
long long with_flags = 0;
if (argc < 4) {
RedictModule_WrongArity(ctx);
return REDICTMODULE_OK;
}
if (RedictModule_StringToLongLong(argv[1],&with_flags) != REDICTMODULE_OK)
return RedictModule_ReplyWithError(ctx,"ERR invalid integer");
int num_keys, *keyflags = NULL;
int *keyidx = RedictModule_GetCommandKeysWithFlags(ctx, &argv[2], argc - 2, &num_keys, with_flags ? &keyflags : NULL);
if (!keyidx) {
if (!errno)
RedictModule_ReplyWithEmptyArray(ctx);
else {
char err[100];
switch (errno) {
case ENOENT:
RedictModule_ReplyWithError(ctx, "ERR ENOENT");
break;
case EINVAL:
RedictModule_ReplyWithError(ctx, "ERR EINVAL");
break;
default:
snprintf(err, sizeof(err) - 1, "ERR errno=%d", errno);
RedictModule_ReplyWithError(ctx, err);
break;
}
}
} else {
int i;
RedictModule_ReplyWithArray(ctx, num_keys);
for (i = 0; i < num_keys; i++) {
if (!with_flags) {
RedictModule_ReplyWithString(ctx, argv[2 + keyidx[i]]);
continue;
}
RedictModule_ReplyWithArray(ctx, 2);
RedictModule_ReplyWithString(ctx, argv[2 + keyidx[i]]);
char* sflags = "";
if (keyflags[i] & REDICTMODULE_CMD_KEY_RO)
sflags = "RO";
else if (keyflags[i] & REDICTMODULE_CMD_KEY_RW)
sflags = "RW";
else if (keyflags[i] & REDICTMODULE_CMD_KEY_OW)
sflags = "OW";
else if (keyflags[i] & REDICTMODULE_CMD_KEY_RM)
sflags = "RM";
RedictModule_ReplyWithCString(ctx, sflags);
}
RedictModule_Free(keyidx);
RedictModule_Free(keyflags);
}
return REDICTMODULE_OK;
}
int RedictModule_OnLoad(RedictModuleCtx *ctx, RedictModuleString **argv, int argc) {
UNUSED(argv);
UNUSED(argc);
if (RedictModule_Init(ctx,"getkeys",1,REDICTMODULE_APIVER_1)== REDICTMODULE_ERR)
return REDICTMODULE_ERR;
if (RedictModule_CreateCommand(ctx,"getkeys.command", getkeys_command,"getkeys-api",0,0,0) == REDICTMODULE_ERR)
return REDICTMODULE_ERR;
if (RedictModule_CreateCommand(ctx,"getkeys.command_with_flags", getkeys_command_with_flags,"getkeys-api",0,0,0) == REDICTMODULE_ERR)
return REDICTMODULE_ERR;
if (RedictModule_CreateCommand(ctx,"getkeys.fixed", getkeys_fixed,"",2,4,1) == REDICTMODULE_ERR)
return REDICTMODULE_ERR;
if (RedictModule_CreateCommand(ctx,"getkeys.introspect", getkeys_introspect,"",0,0,0) == REDICTMODULE_ERR)
return REDICTMODULE_ERR;
return REDICTMODULE_OK;
}
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