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
|
/*
Minetest
Copyright (C) 2014 celeron55, Perttu Ahola <celeron55@gmail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#if USE_REDIS
#include "database-redis.h"
#include "settings.h"
#include "log.h"
#include "exceptions.h"
#include "util/string.h"
#include <hiredis.h>
#include <cassert>
Database_Redis::Database_Redis(Settings &conf)
{
std::string tmp;
try {
tmp = conf.get("redis_address");
hash = conf.get("redis_hash");
} catch (SettingNotFoundException) {
throw SettingNotFoundException("Set redis_address and "
"redis_hash in world.mt to use the redis backend");
}
const char *addr = tmp.c_str();
int port = conf.exists("redis_port") ? conf.getU16("redis_port") : 6379;
// if redis_address contains '/' assume unix socket, else hostname/ip
ctx = tmp.find('/') != std::string::npos ? redisConnectUnix(addr) : redisConnect(addr, port);
if (!ctx) {
throw DatabaseException("Cannot allocate redis context");
} else if (ctx->err) {
std::string err = std::string("Connection error: ") + ctx->errstr;
redisFree(ctx);
throw DatabaseException(err);
}
if (conf.exists("redis_password")) {
tmp = conf.get("redis_password");
redisReply *reply = static_cast<redisReply *>(redisCommand(ctx, "AUTH %s", tmp.c_str()));
if (!reply)
throw DatabaseException("Redis authentication failed");
if (reply->type == REDIS_REPLY_ERROR) {
std::string err = "Redis authentication failed: " + std::string(reply->str, reply->len);
freeReplyObject(reply);
throw DatabaseException(err);
}
freeReplyObject(reply);
}
}
Database_Redis::~Database_Redis()
{
redisFree(ctx);
}
void Database_Redis::beginSave() {
redisReply *reply = static_cast<redisReply *>(redisCommand(ctx, "MULTI"));
if (!reply) {
throw DatabaseException(std::string(
"Redis command 'MULTI' failed: ") + ctx->errstr);
}
freeReplyObject(reply);
}
void Database_Redis::endSave() {
redisReply *reply = static_cast<redisReply *>(redisCommand(ctx, "EXEC"));
if (!reply) {
throw DatabaseException(std::string(
"Redis command 'EXEC' failed: ") + ctx->errstr);
}
freeReplyObject(reply);
}
bool Database_Redis::saveBlock(const v3s16 &pos, const std::string &data)
{
std::string tmp = i64tos(getBlockAsInteger(pos));
redisReply *reply = static_cast<redisReply *>(redisCommand(ctx, "HSET %s %s %b",
hash.c_str(), tmp.c_str(), data.c_str(), data.size()));
if (!reply) {
warningstream << "saveBlock: redis command 'HSET' failed on "
"block " << PP(pos) << ": " << ctx->errstr << std::endl;
freeReplyObject(reply);
return false;
}
if (reply->type == REDIS_REPLY_ERROR) {
warningstream << "saveBlock: saving block " << PP(pos)
<< " failed: " << std::string(reply->str, reply->len) << std::endl;
freeReplyObject(reply);
return false;
}
freeReplyObject(reply);
return true;
}
void Database_Redis::loadBlock(const v3s16 &pos, std::string *block)
{
std::string tmp = i64tos(getBlockAsInteger(pos));
redisReply *reply = static_cast<redisReply *>(redisCommand(ctx,
"HGET %s %s", hash.c_str(), tmp.c_str()));
if (!reply) {
throw DatabaseException(std::string(
"Redis command 'HGET %s %s' failed: ") + ctx->errstr);
}
switch (reply->type) {
case REDIS_REPLY_STRING: {
*block = std::string(reply->str, reply->len);
// std::string copies the memory so this won't cause any problems
freeReplyObject(reply);
return;
}
case REDIS_REPLY_ERROR: {
std::string errstr(reply->str, reply->len);
freeReplyObject(reply);
errorstream << "loadBlock: loading block " << PP(pos)
<< " failed: " << errstr << std::endl;
throw DatabaseException(std::string(
"Redis command 'HGET %s %s' errored: ") + errstr);
}
case REDIS_REPLY_NIL: {
*block = "";
// block not found in database
freeReplyObject(reply);
return;
}
}
errorstream << "loadBlock: loading block " << PP(pos)
<< " returned invalid reply type " << reply->type
<< ": " << std::string(reply->str, reply->len) << std::endl;
freeReplyObject(reply);
throw DatabaseException(std::string(
"Redis command 'HGET %s %s' gave invalid reply."));
}
bool Database_Redis::deleteBlock(const v3s16 &pos)
{
std::string tmp = i64tos(getBlockAsInteger(pos));
redisReply *reply = static_cast<redisReply *>(redisCommand(ctx,
"HDEL %s %s", hash.c_str(), tmp.c_str()));
if (!reply) {
throw DatabaseException(std::string(
"Redis command 'HDEL %s %s' failed: ") + ctx->errstr);
} else if (reply->type == REDIS_REPLY_ERROR) {
warningstream << "deleteBlock: deleting block " << PP(pos)
<< " failed: " << std::string(reply->str, reply->len) << std::endl;
freeReplyObject(reply);
return false;
}
freeReplyObject(reply);
return true;
}
void Database_Redis::listAllLoadableBlocks(std::vector<v3s16> &dst)
{
redisReply *reply = static_cast<redisReply *>(redisCommand(ctx, "HKEYS %s", hash.c_str()));
if (!reply) {
throw DatabaseException(std::string(
"Redis command 'HKEYS %s' failed: ") + ctx->errstr);
}
switch (reply->type) {
case REDIS_REPLY_ARRAY:
dst.reserve(reply->elements);
for (size_t i = 0; i < reply->elements; i++) {
assert(reply->element[i]->type == REDIS_REPLY_STRING);
dst.push_back(getIntegerAsBlock(stoi64(reply->element[i]->str)));
}
break;
case REDIS_REPLY_ERROR:
throw DatabaseException(std::string(
"Failed to get keys from database: ") +
std::string(reply->str, reply->len));
}
freeReplyObject(reply);
}
#endif // USE_REDIS
|
