/usr/include/mongo/db/oplogreader.h is in mongodb-dev 1:2.4.9-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | /** @file oplogreader.h */
/**
* Copyright (C) 2012 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 "../client/constants.h"
#include "dbhelpers.h"
#include "mongo/client/dbclientcursor.h"
namespace mongo {
/* started abstracting out the querying of the primary/master's oplog
still fairly awkward but a start.
*/
class OplogReader {
shared_ptr<DBClientConnection> _conn;
shared_ptr<DBClientCursor> cursor;
bool _doHandshake;
int _tailingQueryOptions;
public:
OplogReader( bool doHandshake = true );
~OplogReader() { }
void resetCursor() { cursor.reset(); }
void resetConnection() {
cursor.reset();
_conn.reset();
}
DBClientConnection* conn() { return _conn.get(); }
BSONObj findOne(const char *ns, const Query& q) {
return conn()->findOne(ns, q, 0, QueryOption_SlaveOk);
}
BSONObj getLastOp(const char *ns) {
return findOne(ns, Query().sort(reverseNaturalObj));
}
/* ok to call if already connected */
bool connect(const std::string& hostname);
bool connect(const BSONObj& rid, const int from, const string& to);
void tailCheck() {
if( cursor.get() && cursor->isDead() ) {
log() << "repl: old cursor isDead, will initiate a new one" << endl;
resetCursor();
}
}
bool haveCursor() { return cursor.get() != 0; }
/** this is ok but commented out as when used one should consider if QueryOption_OplogReplay
is needed; if not fine, but if so, need to change.
*//*
void query(const char *ns, const BSONObj& query) {
verify( !haveCursor() );
cursor.reset( _conn->query(ns, query, 0, 0, 0, QueryOption_SlaveOk).release() );
}*/
/** this can be used; it is commented out as it does not indicate
QueryOption_OplogReplay and that is likely important. could be uncommented
just need to add that.
*/
/*
void queryGTE(const char *ns, OpTime t) {
BSONObjBuilder q;
q.appendDate("$gte", t.asDate());
BSONObjBuilder q2;
q2.append("ts", q.done());
query(ns, q2.done());
}
*/
void tailingQuery(const char *ns, const BSONObj& query, const BSONObj* fields=0);
void tailingQueryGTE(const char *ns, OpTime t, const BSONObj* fields=0);
/* Do a tailing query, but only send the ts field back. */
void ghostQueryGTE(const char *ns, OpTime t) {
const BSONObj fields = BSON("ts" << 1 << "_id" << 0);
return tailingQueryGTE(ns, t, &fields);
}
bool more() {
uassert( 15910, "Doesn't have cursor for reading oplog", cursor.get() );
return cursor->more();
}
bool moreInCurrentBatch() {
uassert( 15911, "Doesn't have cursor for reading oplog", cursor.get() );
return cursor->moreInCurrentBatch();
}
int currentBatchMessageSize() {
if( NULL == cursor->getMessage() )
return 0;
return cursor->getMessage()->size();
}
/* old mongod's can't do the await flag... */
bool awaitCapable() {
return cursor->hasResultFlag(ResultFlag_AwaitCapable);
}
int getTailingQueryOptions() const { return _tailingQueryOptions; }
void setTailingQueryOptions( int tailingQueryOptions ) { _tailingQueryOptions = tailingQueryOptions; }
void peek(vector<BSONObj>& v, int n) {
if( cursor.get() )
cursor->peek(v,n);
}
BSONObj nextSafe() { return cursor->nextSafe(); }
BSONObj next() { return cursor->next(); }
void putBack(BSONObj op) { cursor->putBack(op); }
private:
/** @return true iff connection was successful */
bool commonConnect(const string& hostName);
bool passthroughHandshake(const BSONObj& rid, const int f);
};
}
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