1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
|
#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;
// 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);
// 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(bg->bc, NULL);
/* Free the arguments */
for (int i=0; i<bg->argc; i++)
RedisModule_FreeString(ctx, bg->argv[i]);
RedisModule_Free(bg->argv);
RedisModule_Free(bg);
// 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);
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;
}
|
