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
|
// dbclient.cpp - connect to a Mongo database as a client, from C++
/**
* 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/>.
*/
#include "stdafx.h"
#include "pdfile.h"
#include "dbclient.h"
#include "../util/builder.h"
#include "jsobj.h"
#include "query.h"
JSObj DBClientConnection::findOne(const char *ns, JSObj query, JSObj *fieldsToReturn, int queryOptions) {
auto_ptr<DBClientCursor> c =
this->query(ns, query, 1, 0, fieldsToReturn, queryOptions);
massert( "DBClientConnection::findOne: transport error", c.get() );
if( !c->more() )
return JSObj();
return c->next().copy();
}
bool DBClientConnection::connect(const char *serverAddress, string& errmsg) {
/* not reentrant!
ok as used right now (we are in a big lock), but won't be later, so fix. */
int port = DBPort;
string ip = hostbyname_nonreentrant(serverAddress);
if( ip.empty() )
ip = serverAddress;
int idx = ip.find( ":" );
if ( idx != string::npos ){
//cout << "port string:" << ip.substr( idx ) << endl;
port = atoi( ip.substr( idx + 1 ).c_str() );
ip = ip.substr( 0 , idx );
ip = hostbyname_nonreentrant(ip.c_str());
}
if( ip.empty() )
ip = serverAddress;
//cout << "port:" << port << endl;
server = auto_ptr<SockAddr>(new SockAddr(ip.c_str(), port));
if( !p.connect(*server) ) {
errmsg = string("couldn't connect to server ") + serverAddress + ' ' + ip;
failed = true;
return false;
}
return true;
}
auto_ptr<DBClientCursor> DBClientConnection::query(const char *ns, JSObj query, int nToReturn, int nToSkip, JSObj *fieldsToReturn, int queryOptions) {
// see query.h for the protocol we are using here.
BufBuilder b;
int opts = queryOptions;
assert( (opts&Option_ALLMASK) == opts );
b.append(opts);
b.append(ns);
b.append(nToSkip);
b.append(nToReturn);
query.appendSelfToBufBuilder(b);
if( fieldsToReturn )
fieldsToReturn->appendSelfToBufBuilder(b);
Message toSend;
toSend.setData(dbQuery, b.buf(), b.len());
auto_ptr<Message> response(new Message());
if( !p.call(toSend, *response) ) {
failed = true;
return auto_ptr<DBClientCursor>(0);
}
auto_ptr<DBClientCursor> c(new DBClientCursor(this, p, response, opts));
c->ns = ns;
c->nToReturn = nToReturn;
return c;
}
/* -- DBClientCursor ---------------------------------------------- */
void DBClientCursor::requestMore() {
assert( cursorId && pos == nReturned );
BufBuilder b;
b.append(opts);
b.append(ns.c_str());
b.append(nToReturn);
b.append(cursorId);
Message toSend;
toSend.setData(dbGetMore, b.buf(), b.len());
auto_ptr<Message> response(new Message());
if( !p.call(toSend, *response) ) {
conn->failed = true;
massert("dbclient error communicating with server", false);
}
m = response;
dataReceived();
}
void DBClientCursor::dataReceived() {
QueryResult *qr = (QueryResult *) m->data;
if( qr->resultFlags() & ResultFlag_CursorNotFound ) {
// cursor id no longer valid at the server.
assert( qr->cursorId == 0 );
cursorId = 0; // 0 indicates no longer valid (dead)
}
if( cursorId == 0 ) {
// only set initially: we don't want to kill it on end of data
// if it's a tailable cursor
cursorId = qr->cursorId;
}
nReturned = qr->nReturned;
pos = 0;
data = qr->data();
/* this assert would fire the way we currently work:
assert( nReturned || cursorId == 0 );
*/
}
bool DBClientCursor::more() {
if( pos < nReturned )
return true;
if( cursorId == 0 )
return false;
requestMore();
return pos < nReturned;
}
JSObj DBClientCursor::next() {
assert( more() );
pos++;
JSObj o(data);
data += o.objsize();
return o;
}
/* ------------------------------------------------------ */
// "./db testclient" to invoke
extern JSObj emptyObj;
void testClient() {
cout << "testClient()" << endl;
DBClientConnection c;
string err;
assert( c.connect("127.0.0.1", err) );
cout << "query foo.bar..." << endl;
auto_ptr<DBClientCursor> cursor =
c.query("foo.bar", emptyObj, 0, 0, 0, Option_CursorTailable);
DBClientCursor *cc = cursor.get();
while( 1 ) {
bool m = cc->more();
cout << "more: " << m << " dead:" << cc->isDead() << endl;
if( !m ) {
if( cc->isDead() )
cout << "cursor dead, stopping" << endl;
else {
cout << "Sleeping 10 seconds" << endl;
sleepsecs(10);
continue;
}
break;
}
cout << cc->next().toString() << endl;
}
}
|
