mirror of
https://github.com/mongodb/mongo.git
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374 lines
13 KiB
C++
374 lines
13 KiB
C++
// syncclusterconnection.cpp
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/*
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* Copyright 2010 10gen Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "pch.h"
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#include "syncclusterconnection.h"
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#include "../db/dbmessage.h"
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// error codes 8000-8009
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namespace mongo {
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SyncClusterConnection::SyncClusterConnection( const list<HostAndPort> & L) : _mutex("SynClusterConnection") {
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{
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stringstream s;
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int n=0;
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for( list<HostAndPort>::const_iterator i = L.begin(); i != L.end(); i++ ) {
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if( ++n > 1 ) s << ',';
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s << i->toString();
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}
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_address = s.str();
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}
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for( list<HostAndPort>::const_iterator i = L.begin(); i != L.end(); i++ )
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_connect( i->toString() );
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}
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SyncClusterConnection::SyncClusterConnection( string commaSeperated ) : _mutex("SyncClusterConnection") {
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_address = commaSeperated;
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string::size_type idx;
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while ( ( idx = commaSeperated.find( ',' ) ) != string::npos ){
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string h = commaSeperated.substr( 0 , idx );
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commaSeperated = commaSeperated.substr( idx + 1 );
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_connect( h );
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}
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_connect( commaSeperated );
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uassert( 8004 , "SyncClusterConnection needs 3 servers" , _conns.size() == 3 );
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}
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SyncClusterConnection::SyncClusterConnection( string a , string b , string c ) : _mutex("SyncClusterConnection") {
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_address = a + "," + b + "," + c;
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// connect to all even if not working
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_connect( a );
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_connect( b );
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_connect( c );
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}
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SyncClusterConnection::SyncClusterConnection( SyncClusterConnection& prev ) : _mutex("SyncClusterConnection") {
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assert(0);
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}
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SyncClusterConnection::~SyncClusterConnection(){
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for ( size_t i=0; i<_conns.size(); i++ )
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delete _conns[i];
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_conns.clear();
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}
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bool SyncClusterConnection::prepare( string& errmsg ){
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_lastErrors.clear();
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return fsync( errmsg );
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}
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bool SyncClusterConnection::fsync( string& errmsg ){
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bool ok = true;
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errmsg = "";
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for ( size_t i=0; i<_conns.size(); i++ ){
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BSONObj res;
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try {
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if ( _conns[i]->simpleCommand( "admin" , 0 , "fsync" ) )
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continue;
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}
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catch ( std::exception& e ){
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errmsg += e.what();
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}
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catch ( ... ){
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}
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ok = false;
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errmsg += _conns[i]->toString() + ":" + res.toString();
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}
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return ok;
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}
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void SyncClusterConnection::_checkLast(){
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_lastErrors.clear();
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vector<string> errors;
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for ( size_t i=0; i<_conns.size(); i++ ){
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BSONObj res;
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string err;
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try {
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if ( ! _conns[i]->runCommand( "admin" , BSON( "getlasterror" << 1 << "fsync" << 1 ) , res ) )
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err = "cmd failed: ";
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}
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catch ( std::exception& e ){
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err += e.what();
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}
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catch ( ... ){
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err += "unknown failure";
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}
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_lastErrors.push_back( res.getOwned() );
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errors.push_back( err );
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}
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assert( _lastErrors.size() == errors.size() && _lastErrors.size() == _conns.size() );
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stringstream err;
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bool ok = true;
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for ( size_t i = 0; i<_conns.size(); i++ ){
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BSONObj res = _lastErrors[i];
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if ( res["ok"].trueValue() && res["fsyncFiles"].numberInt() > 0 )
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continue;
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ok = false;
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err << _conns[i]->toString() << ": " << res << " " << errors[i];
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}
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if ( ok )
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return;
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throw UserException( 8001 , (string)"SyncClusterConnection write op failed: " + err.str() );
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}
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BSONObj SyncClusterConnection::getLastErrorDetailed(){
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if ( _lastErrors.size() )
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return _lastErrors[0];
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return DBClientBase::getLastErrorDetailed();
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}
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void SyncClusterConnection::_connect( string host ){
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log() << "SyncClusterConnection connecting to [" << host << "]" << endl;
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DBClientConnection * c = new DBClientConnection( true );
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string errmsg;
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if ( ! c->connect( host , errmsg ) )
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log() << "SyncClusterConnection connect fail to: " << host << " errmsg: " << errmsg << endl;
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_connAddresses.push_back( host );
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_conns.push_back( c );
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}
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bool SyncClusterConnection::callRead( Message& toSend , Message& response ){
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// TODO: need to save state of which one to go back to somehow...
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return _conns[0]->callRead( toSend , response );
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}
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BSONObj SyncClusterConnection::findOne(const string &ns, const Query& query, const BSONObj *fieldsToReturn, int queryOptions) {
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if ( ns.find( ".$cmd" ) != string::npos ){
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string cmdName = query.obj.firstElement().fieldName();
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int lockType = _lockType( cmdName );
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if ( lockType > 0 ){ // write $cmd
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string errmsg;
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if ( ! prepare( errmsg ) )
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throw UserException( 13104 , (string)"SyncClusterConnection::findOne prepare failed: " + errmsg );
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vector<BSONObj> all;
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for ( size_t i=0; i<_conns.size(); i++ ){
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all.push_back( _conns[i]->findOne( ns , query , 0 , queryOptions ).getOwned() );
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}
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_checkLast();
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for ( size_t i=0; i<all.size(); i++ ){
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BSONObj temp = all[i];
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if ( isOk( temp ) )
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continue;
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stringstream ss;
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ss << "write $cmd failed on a shard: " << temp.jsonString();
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ss << " " << _conns[i]->toString();
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throw UserException( 13105 , ss.str() );
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}
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return all[0];
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}
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}
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return DBClientBase::findOne( ns , query , fieldsToReturn , queryOptions );
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}
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auto_ptr<DBClientCursor> SyncClusterConnection::query(const string &ns, Query query, int nToReturn, int nToSkip,
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const BSONObj *fieldsToReturn, int queryOptions, int batchSize ){
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_lastErrors.clear();
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if ( ns.find( ".$cmd" ) != string::npos ){
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string cmdName = query.obj.firstElement().fieldName();
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int lockType = _lockType( cmdName );
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uassert( 13054 , (string)"write $cmd not supported in SyncClusterConnection::query for:" + cmdName , lockType <= 0 );
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}
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return _queryOnActive( ns , query , nToReturn , nToSkip , fieldsToReturn , queryOptions , batchSize );
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}
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bool SyncClusterConnection::_commandOnActive(const string &dbname, const BSONObj& cmd, BSONObj &info, int options ){
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auto_ptr<DBClientCursor> cursor = _queryOnActive( dbname + ".$cmd" , cmd , 1 , 0 , 0 , options , 0 );
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if ( cursor->more() )
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info = cursor->next().copy();
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else
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info = BSONObj();
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return isOk( info );
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}
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auto_ptr<DBClientCursor> SyncClusterConnection::_queryOnActive(const string &ns, Query query, int nToReturn, int nToSkip,
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const BSONObj *fieldsToReturn, int queryOptions, int batchSize ){
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for ( size_t i=0; i<_conns.size(); i++ ){
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try {
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auto_ptr<DBClientCursor> cursor =
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_conns[i]->query( ns , query , nToReturn , nToSkip , fieldsToReturn , queryOptions , batchSize );
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if ( cursor.get() )
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return cursor;
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log() << "query failed to: " << _conns[i]->toString() << " no data" << endl;
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}
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catch ( ... ){
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log() << "query failed to: " << _conns[i]->toString() << " exception" << endl;
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}
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}
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throw UserException( 8002 , "all servers down!" );
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}
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auto_ptr<DBClientCursor> SyncClusterConnection::getMore( const string &ns, long long cursorId, int nToReturn, int options ){
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uassert( 10022 , "SyncClusterConnection::getMore not supported yet" , 0);
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auto_ptr<DBClientCursor> c;
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return c;
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}
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void SyncClusterConnection::insert( const string &ns, BSONObj obj ){
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uassert( 13119 , (string)"SyncClusterConnection::insert obj has to have an _id: " + obj.jsonString() ,
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ns.find( ".system.indexes" ) != string::npos || obj["_id"].type() );
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string errmsg;
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if ( ! prepare( errmsg ) )
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throw UserException( 8003 , (string)"SyncClusterConnection::insert prepare failed: " + errmsg );
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for ( size_t i=0; i<_conns.size(); i++ ){
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_conns[i]->insert( ns , obj );
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}
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_checkLast();
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}
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void SyncClusterConnection::insert( const string &ns, const vector< BSONObj >& v ){
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uassert( 10023 , "SyncClusterConnection bulk insert not implemented" , 0);
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}
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void SyncClusterConnection::remove( const string &ns , Query query, bool justOne ){
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string errmsg;
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if ( ! prepare( errmsg ) )
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throw UserException( 8020 , (string)"SyncClusterConnection::remove prepare failed: " + errmsg );
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for ( size_t i=0; i<_conns.size(); i++ ){
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_conns[i]->remove( ns , query , justOne );
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}
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_checkLast();
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}
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void SyncClusterConnection::update( const string &ns , Query query , BSONObj obj , bool upsert , bool multi ){
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if ( upsert ){
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uassert( 13120 , "SyncClusterConnection::update upsert query needs _id" , query.obj["_id"].type() );
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}
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if ( _writeConcern ){
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string errmsg;
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if ( ! prepare( errmsg ) )
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throw UserException( 8005 , (string)"SyncClusterConnection::udpate prepare failed: " + errmsg );
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}
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for ( size_t i=0; i<_conns.size(); i++ ){
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try {
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_conns[i]->update( ns , query , obj , upsert , multi );
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}
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catch ( std::exception& e ){
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if ( _writeConcern )
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throw e;
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}
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}
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if ( _writeConcern ){
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_checkLast();
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assert( _lastErrors.size() > 1 );
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int a = _lastErrors[0]["n"].numberInt();
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for ( unsigned i=1; i<_lastErrors.size(); i++ ){
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int b = _lastErrors[i]["n"].numberInt();
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if ( a == b )
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continue;
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throw UpdateNotTheSame( 8017 , "update not consistent" , _connAddresses , _lastErrors );
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}
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}
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}
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string SyncClusterConnection::_toString() const {
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stringstream ss;
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ss << "SyncClusterConnection [" << _address << "]";
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return ss.str();
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}
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bool SyncClusterConnection::call( Message &toSend, Message &response, bool assertOk ){
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uassert( 8006 , "SyncClusterConnection::call can only be used directly for dbQuery" ,
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toSend.operation() == dbQuery );
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DbMessage d( toSend );
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uassert( 8007 , "SyncClusterConnection::call can't handle $cmd" , strstr( d.getns(), "$cmd" ) == 0 );
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for ( size_t i=0; i<_conns.size(); i++ ){
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try {
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bool ok = _conns[i]->call( toSend , response , assertOk );
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if ( ok )
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return ok;
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log() << "call failed to: " << _conns[i]->toString() << " no data" << endl;
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}
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catch ( ... ){
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log() << "call failed to: " << _conns[i]->toString() << " exception" << endl;
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}
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}
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throw UserException( 8008 , "all servers down!" );
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}
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void SyncClusterConnection::say( Message &toSend ){
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string errmsg;
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if ( ! prepare( errmsg ) )
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throw UserException( 13397 , (string)"SyncClusterConnection::say prepare failed: " + errmsg );
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for ( size_t i=0; i<_conns.size(); i++ ){
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_conns[i]->say( toSend );
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}
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_checkLast();
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}
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void SyncClusterConnection::sayPiggyBack( Message &toSend ){
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assert(0);
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}
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int SyncClusterConnection::_lockType( const string& name ){
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{
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scoped_lock lk(_mutex);
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map<string,int>::iterator i = _lockTypes.find( name );
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if ( i != _lockTypes.end() )
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return i->second;
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}
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BSONObj info;
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uassert( 13053 , "help failed" , _commandOnActive( "admin" , BSON( name << "1" << "help" << 1 ) , info ) );
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int lockType = info["lockType"].numberInt();
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scoped_lock lk(_mutex);
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_lockTypes[name] = lockType;
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return lockType;
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}
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void SyncClusterConnection::killCursor( long long cursorID ){
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// should never need to do this
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assert(0);
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}
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}
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