1
2 /**
3 * Copyright (C) 2018-present MongoDB, Inc.
4 *
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the Server Side Public License, version 1,
7 * as published by MongoDB, Inc.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * Server Side Public License for more details.
13 *
14 * You should have received a copy of the Server Side Public License
15 * along with this program. If not, see
16 * <http://www.mongodb.com/licensing/server-side-public-license>.
17 *
18 * As a special exception, the copyright holders give permission to link the
19 * code of portions of this program with the OpenSSL library under certain
20 * conditions as described in each individual source file and distribute
21 * linked combinations including the program with the OpenSSL library. You
22 * must comply with the Server Side Public License in all respects for
23 * all of the code used other than as permitted herein. If you modify file(s)
24 * with this exception, you may extend this exception to your version of the
25 * file(s), but you are not obligated to do so. If you do not wish to do so,
26 * delete this exception statement from your version. If you delete this
27 * exception statement from all source files in the program, then also delete
28 * it in the license file.
29 */
30
31 #define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kReplication
32
33 #include "mongo/platform/basic.h"
34
35 #include "mongo/db/repl/oplogreader.h"
36
37 #include <string>
38
39 #include "mongo/client/dbclientinterface.h"
40 #include "mongo/db/auth/authorization_manager.h"
41 #include "mongo/db/auth/authorization_manager_global.h"
42 #include "mongo/db/auth/authorization_session.h"
43 #include "mongo/db/auth/internal_user_auth.h"
44 #include "mongo/executor/network_interface.h"
45 #include "mongo/util/log.h"
46
47 namespace mongo {
48
49 using std::shared_ptr;
50 using std::endl;
51 using std::string;
52
53 namespace repl {
54
replAuthenticate(DBClientBase * conn)55 bool replAuthenticate(DBClientBase* conn) {
56 if (isInternalAuthSet())
57 return conn->authenticateInternalUser();
58 if (getGlobalAuthorizationManager()->isAuthEnabled())
59 return false;
60 return true;
61 }
62
63 const Seconds OplogReader::kSocketTimeout(30);
64
OplogReader()65 OplogReader::OplogReader() {
66 _tailingQueryOptions = QueryOption_SlaveOk;
67 _tailingQueryOptions |= QueryOption_CursorTailable | QueryOption_OplogReplay;
68
69 /* TODO: slaveOk maybe shouldn't use? */
70 _tailingQueryOptions |= QueryOption_AwaitData;
71
72 // Currently find command doesn't do the cursor tracking that master-slave relies on.
73 _tailingQueryOptions |= DBClientCursor::QueryOptionLocal_forceOpQuery;
74 }
75
connect(const HostAndPort & host)76 bool OplogReader::connect(const HostAndPort& host) {
77 if (conn() == NULL || _host != host) {
78 resetConnection();
79 _conn = shared_ptr<DBClientConnection>(
80 new DBClientConnection(false, durationCount<Seconds>(kSocketTimeout)));
81 string errmsg;
82 if (!_conn->connect(host, StringData(), errmsg) || !replAuthenticate(_conn.get())) {
83 resetConnection();
84 error() << errmsg << endl;
85 return false;
86 }
87 _conn->port().setTag(_conn->port().getTag() |
88 executor::NetworkInterface::kMessagingPortKeepOpen);
89 _host = host;
90 }
91 return true;
92 }
93
tailCheck()94 void OplogReader::tailCheck() {
95 if (cursor.get() && cursor->isDead()) {
96 log() << "old cursor isDead, will initiate a new one" << std::endl;
97 resetCursor();
98 }
99 }
100
tailingQuery(const char * ns,const BSONObj & query)101 void OplogReader::tailingQuery(const char* ns, const BSONObj& query) {
102 verify(!haveCursor());
103 LOG(2) << ns << ".find(" << redact(query) << ')' << endl;
104 cursor.reset(_conn->query(ns, query, 0, 0, nullptr, _tailingQueryOptions).release());
105 }
106
107 } // namespace repl
108 } // namespace mongo
109