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
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
|
/**
* Copyright (C) 2008 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include "storage.h"
#include "jsobj.h"
#include "namespace.h"
#include "../util/message.h"
namespace mongo {
/* db response format
Query or GetMore: // see struct QueryResult
int resultFlags;
int64 cursorID;
int startingFrom;
int nReturned;
list of marshalled JSObjects;
*/
extern bool objcheck;
#pragma pack(1)
struct QueryResult : public MsgData {
enum ResultFlagType {
ResultFlag_CursorNotFound = 1, /* returned, with zero results, when getMore is called but the cursor id is not valid at the server. */
ResultFlag_ErrSet = 2, /* { $err : ... } is being returned */
ResultFlag_ShardConfigStale = 4 /* have to update config from the server, usually $err is also set */
};
long long cursorId;
int startingFrom;
int nReturned;
const char *data() {
return (char *) (((int *)&nReturned)+1);
}
int& resultFlags() {
return dataAsInt();
}
};
#pragma pack()
/* For the database/server protocol, these objects and functions encapsulate
the various messages transmitted over the connection.
*/
class DbMessage {
public:
DbMessage(const Message& _m) : m(_m) {
theEnd = _m.data->_data + _m.data->dataLen();
int *r = (int *) _m.data->_data;
reserved = *r;
r++;
data = (const char *) r;
nextjsobj = data;
}
const char * getns() {
return data;
}
void getns(Namespace& ns) {
ns = data;
}
void resetPull(){
nextjsobj = data;
}
int pullInt() {
if ( nextjsobj == data )
nextjsobj += strlen(data) + 1; // skip namespace
int i = *((int *)nextjsobj);
nextjsobj += 4;
return i;
}
long long pullInt64() const {
return pullInt64();
}
long long &pullInt64() {
if ( nextjsobj == data )
nextjsobj += strlen(data) + 1; // skip namespace
long long &i = *((long long *)nextjsobj);
nextjsobj += 8;
return i;
}
OID* getOID() {
return (OID *) (data + strlen(data) + 1); // skip namespace
}
void getQueryStuff(const char *&query, int& ntoreturn) {
int *i = (int *) (data + strlen(data) + 1);
ntoreturn = *i;
i++;
query = (const char *) i;
}
/* for insert and update msgs */
bool moreJSObjs() {
return nextjsobj != 0;
}
BSONObj nextJsObj() {
if ( nextjsobj == data )
nextjsobj += strlen(data) + 1; // skip namespace
massert( "Remaining data too small for BSON object", theEnd - nextjsobj > 3 );
BSONObj js(nextjsobj);
massert( "Invalid object size", js.objsize() > 3 );
massert( "Next object larger than available space",
js.objsize() < ( theEnd - data ) );
if ( objcheck && !js.valid() ) {
massert("bad object in message", false);
}
nextjsobj += js.objsize();
if ( nextjsobj >= theEnd )
nextjsobj = 0;
return js;
}
const Message& msg() {
return m;
}
void markSet(){
mark = nextjsobj;
}
void markReset(){
nextjsobj = mark;
}
private:
const Message& m;
int reserved;
const char *data;
const char *nextjsobj;
const char *theEnd;
const char * mark;
};
/* a request to run a query, received from the database */
class QueryMessage {
public:
const char *ns;
int ntoskip;
int ntoreturn;
int queryOptions;
BSONObj query;
auto_ptr< set<string> > fields;
/* parses the message into the above fields */
QueryMessage(DbMessage& d) {
ns = d.getns();
ntoskip = d.pullInt();
ntoreturn = d.pullInt();
query = d.nextJsObj();
if ( d.moreJSObjs() ) {
fields = auto_ptr< set<string> >(new set<string>());
d.nextJsObj().getFieldNames(*fields);
if ( fields->size() == 0 )
fields.reset();
}
queryOptions = d.msg().data->dataAsInt();
}
};
} // namespace mongo
#include "../client/dbclient.h"
namespace mongo {
inline void replyToQuery(int queryResultFlags,
AbstractMessagingPort* p, Message& requestMsg,
void *data, int size,
int nReturned, int startingFrom = 0,
long long cursorId = 0
) {
BufBuilder b(32768);
b.skip(sizeof(QueryResult));
b.append(data, size);
QueryResult *qr = (QueryResult *) b.buf();
qr->resultFlags() = queryResultFlags;
qr->len = b.len();
qr->setOperation(opReply);
qr->cursorId = cursorId;
qr->startingFrom = startingFrom;
qr->nReturned = nReturned;
b.decouple();
Message *resp = new Message();
resp->setData(qr, true); // transport will free
p->reply(requestMsg, *resp, requestMsg.data->id);
}
} // namespace mongo
//#include "bsonobj.h"
#include "instance.h"
namespace mongo {
/* object reply helper. */
inline void replyToQuery(int queryResultFlags,
AbstractMessagingPort* p, Message& requestMsg,
BSONObj& responseObj)
{
replyToQuery(queryResultFlags,
p, requestMsg,
(void *) responseObj.objdata(), responseObj.objsize(), 1);
}
/* helper to do a reply using a DbResponse object */
inline void replyToQuery(int queryResultFlags, Message &m, DbResponse &dbresponse, BSONObj obj) {
BufBuilder b;
b.skip(sizeof(QueryResult));
b.append((void*) obj.objdata(), obj.objsize());
QueryResult* msgdata = (QueryResult *) b.buf();
b.decouple();
QueryResult *qr = msgdata;
qr->resultFlags() = queryResultFlags;
qr->len = b.len();
qr->setOperation(opReply);
qr->cursorId = 0;
qr->startingFrom = 0;
qr->nReturned = 1;
Message *resp = new Message();
resp->setData(msgdata, true); // transport will free
dbresponse.response = resp;
dbresponse.responseTo = m.data->id;
}
} // namespace mongo
|
