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#include "redismodule.h"
#include <pthread.h>
#include <assert.h>
#define UNUSED(V) ((void) V)
RedisModuleUser *user = NULL;
int call_without_user(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) {
if (argc < 2) {
return RedisModule_WrongArity(ctx);
}
const char *cmd = RedisModule_StringPtrLen(argv[1], NULL);
RedisModuleCallReply *rep = RedisModule_Call(ctx, cmd, "Ev", argv + 2, argc - 2);
if (!rep) {
RedisModule_ReplyWithError(ctx, "NULL reply returned");
} else {
RedisModule_ReplyWithCallReply(ctx, rep);
RedisModule_FreeCallReply(rep);
}
return REDISMODULE_OK;
}
int call_with_user_flag(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) {
if (argc < 3) {
return RedisModule_WrongArity(ctx);
}
RedisModule_SetContextUser(ctx, user);
/* Append Ev to the provided flags. */
RedisModuleString *flags = RedisModule_CreateStringFromString(ctx, argv[1]);
RedisModule_StringAppendBuffer(ctx, flags, "Ev", 2);
const char* flg = RedisModule_StringPtrLen(flags, NULL);
const char* cmd = RedisModule_StringPtrLen(argv[2], NULL);
RedisModuleCallReply* rep = RedisModule_Call(ctx, cmd, flg, argv + 3, argc - 3);
if (!rep) {
RedisModule_ReplyWithError(ctx, "NULL reply returned");
} else {
RedisModule_ReplyWithCallReply(ctx, rep);
RedisModule_FreeCallReply(rep);
}
RedisModule_FreeString(ctx, flags);
return REDISMODULE_OK;
}
int add_to_acl(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) {
if (argc != 2) {
return RedisModule_WrongArity(ctx);
}
size_t acl_len;
const char *acl = RedisModule_StringPtrLen(argv[1], &acl_len);
RedisModuleString *error;
int ret = RedisModule_SetModuleUserACLString(ctx, user, acl, &error);
if (ret) {
size_t len;
const char * e = RedisModule_StringPtrLen(error, &len);
RedisModule_ReplyWithError(ctx, e);
return REDISMODULE_OK;
}
RedisModule_ReplyWithSimpleString(ctx, "OK");
return REDISMODULE_OK;
}
int get_acl(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) {
REDISMODULE_NOT_USED(argv);
if (argc != 1) {
return RedisModule_WrongArity(ctx);
}
RedisModule_Assert(user != NULL);
RedisModuleString *acl = RedisModule_GetModuleUserACLString(user);
RedisModule_ReplyWithString(ctx, acl);
RedisModule_FreeString(NULL, acl);
return REDISMODULE_OK;
}
int reset_user(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) {
REDISMODULE_NOT_USED(argv);
if (argc != 1) {
return RedisModule_WrongArity(ctx);
}
if (user != NULL) {
RedisModule_FreeModuleUser(user);
}
user = RedisModule_CreateModuleUser("module_user");
RedisModule_ReplyWithSimpleString(ctx, "OK");
return REDISMODULE_OK;
}
typedef struct {
RedisModuleString **argv;
int argc;
RedisModuleBlockedClient *bc;
} bg_call_data;
void *bg_call_worker(void *arg) {
bg_call_data *bg = arg;
RedisModuleBlockedClient *bc = bg->bc;
// Get Redis module context
RedisModuleCtx *ctx = RedisModule_GetThreadSafeContext(bg->bc);
// Acquire GIL
RedisModule_ThreadSafeContextLock(ctx);
// Set user
RedisModule_SetContextUser(ctx, user);
// Call the command
size_t format_len;
RedisModuleString *format_redis_str = RedisModule_CreateString(NULL, "v", 1);
const char *format = RedisModule_StringPtrLen(bg->argv[1], &format_len);
RedisModule_StringAppendBuffer(NULL, format_redis_str, format, format_len);
RedisModule_StringAppendBuffer(NULL, format_redis_str, "E", 1);
format = RedisModule_StringPtrLen(format_redis_str, NULL);
const char *cmd = RedisModule_StringPtrLen(bg->argv[2], NULL);
RedisModuleCallReply *rep = RedisModule_Call(ctx, cmd, format, bg->argv + 3, bg->argc - 3);
RedisModule_FreeString(NULL, format_redis_str);
/* Free the arguments within GIL to prevent simultaneous freeing in main thread. */
for (int i=0; i<bg->argc; i++)
RedisModule_FreeString(ctx, bg->argv[i]);
RedisModule_Free(bg->argv);
RedisModule_Free(bg);
// Release GIL
RedisModule_ThreadSafeContextUnlock(ctx);
// Reply to client
if (!rep) {
RedisModule_ReplyWithError(ctx, "NULL reply returned");
} else {
RedisModule_ReplyWithCallReply(ctx, rep);
RedisModule_FreeCallReply(rep);
}
// Unblock client
RedisModule_UnblockClient(bc, NULL);
// Free the Redis module context
RedisModule_FreeThreadSafeContext(ctx);
return NULL;
}
int call_with_user_bg(RedisModuleCtx *ctx, RedisModuleString **argv, int argc)
{
UNUSED(argv);
UNUSED(argc);
/* Make sure we're not trying to block a client when we shouldn't */
int flags = RedisModule_GetContextFlags(ctx);
int allFlags = RedisModule_GetContextFlagsAll();
if ((allFlags & REDISMODULE_CTX_FLAGS_MULTI) &&
(flags & REDISMODULE_CTX_FLAGS_MULTI)) {
RedisModule_ReplyWithSimpleString(ctx, "Blocked client is not supported inside multi");
return REDISMODULE_OK;
}
if ((allFlags & REDISMODULE_CTX_FLAGS_DENY_BLOCKING) &&
(flags & REDISMODULE_CTX_FLAGS_DENY_BLOCKING)) {
RedisModule_ReplyWithSimpleString(ctx, "Blocked client is not allowed");
return REDISMODULE_OK;
}
/* Make a copy of the arguments and pass them to the thread. */
bg_call_data *bg = RedisModule_Alloc(sizeof(bg_call_data));
bg->argv = RedisModule_Alloc(sizeof(RedisModuleString*)*argc);
bg->argc = argc;
for (int i=0; i<argc; i++)
bg->argv[i] = RedisModule_HoldString(ctx, argv[i]);
/* Block the client */
bg->bc = RedisModule_BlockClient(ctx, NULL, NULL, NULL, 0);
/* Start a thread to handle the request */
pthread_t tid;
int res = pthread_create(&tid, NULL, bg_call_worker, bg);
assert(res == 0);
pthread_detach(tid);
return REDISMODULE_OK;
}
int RedisModule_OnLoad(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) {
REDISMODULE_NOT_USED(argv);
REDISMODULE_NOT_USED(argc);
if (RedisModule_Init(ctx,"usercall",1,REDISMODULE_APIVER_1)== REDISMODULE_ERR)
return REDISMODULE_ERR;
if (RedisModule_CreateCommand(ctx,"usercall.call_without_user", call_without_user,"write",0,0,0) == REDISMODULE_ERR)
return REDISMODULE_ERR;
if (RedisModule_CreateCommand(ctx,"usercall.call_with_user_flag", call_with_user_flag,"write",0,0,0) == REDISMODULE_ERR)
return REDISMODULE_ERR;
if (RedisModule_CreateCommand(ctx, "usercall.call_with_user_bg", call_with_user_bg, "write", 0, 0, 0) == REDISMODULE_ERR)
return REDISMODULE_ERR;
if (RedisModule_CreateCommand(ctx, "usercall.add_to_acl", add_to_acl, "write",0,0,0) == REDISMODULE_ERR)
return REDISMODULE_ERR;
if (RedisModule_CreateCommand(ctx,"usercall.reset_user", reset_user,"write",0,0,0) == REDISMODULE_ERR)
return REDISMODULE_ERR;
if (RedisModule_CreateCommand(ctx,"usercall.get_acl", get_acl,"write",0,0,0) == REDISMODULE_ERR)
return REDISMODULE_ERR;
return REDISMODULE_OK;
}
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