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dbclient.cpp
1088 lines (899 loc) · 35.7 KB
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dbclient.cpp
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// dbclient.cpp - connect to a Mongo database as a database, from C++
/* Copyright 2009 10gen Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "pch.h"
#include "../db/pdfile.h"
#include "dbclient.h"
#include "../bson/util/builder.h"
#include "../db/jsobj.h"
#include "../db/json.h"
#include "../db/instance.h"
#include "../util/md5.hpp"
#include "../db/dbmessage.h"
#include "../db/cmdline.h"
#include "connpool.h"
#include "../s/util.h"
#include "syncclusterconnection.h"
namespace mongo {
DBClientBase* ConnectionString::connect( string& errmsg ) const {
switch ( _type ){
case MASTER: {
DBClientConnection * c = new DBClientConnection(true);
log(1) << "creating new connection to:" << _servers[0] << endl;
if ( ! c->connect( _servers[0] , errmsg ) ) {
delete c;
return 0;
}
return c;
}
case PAIR:
case SET: {
DBClientReplicaSet * set = new DBClientReplicaSet( _setName , _servers );
if( ! set->connect() ){
delete set;
errmsg = "connect failed to set ";
errmsg += toString();
return 0;
}
return set;
}
case SYNC: {
// TODO , don't copy
list<HostAndPort> l;
for ( unsigned i=0; i<_servers.size(); i++ )
l.push_back( _servers[i] );
return new SyncClusterConnection( l );
}
case INVALID:
throw UserException( 13421 , "trying to connect to invalid ConnectionString" );
break;
}
assert( 0 );
return 0;
}
ConnectionString ConnectionString::parse( const string& host , string& errmsg ){
string::size_type i = host.find( '/' );
if ( i != string::npos ){
// replica set
return ConnectionString( SET , host.substr( i + 1 ) , host.substr( 0 , i ) );
}
int numCommas = DBClientBase::countCommas( host );
if( numCommas == 0 )
return ConnectionString( HostAndPort( host ) );
if ( numCommas == 1 )
return ConnectionString( PAIR , host );
if ( numCommas == 2 )
return ConnectionString( SYNC , host );
errmsg = (string)"invalid hostname [" + host + "]";
return ConnectionString(); // INVALID
}
Query& Query::where(const string &jscode, BSONObj scope) {
/* use where() before sort() and hint() and explain(), else this will assert. */
assert( ! isComplex() );
BSONObjBuilder b;
b.appendElements(obj);
b.appendWhere(jscode, scope);
obj = b.obj();
return *this;
}
void Query::makeComplex() {
if ( isComplex() )
return;
BSONObjBuilder b;
b.append( "query", obj );
obj = b.obj();
}
Query& Query::sort(const BSONObj& s) {
appendComplex( "orderby", s );
return *this;
}
Query& Query::hint(BSONObj keyPattern) {
appendComplex( "$hint", keyPattern );
return *this;
}
Query& Query::explain() {
appendComplex( "$explain", true );
return *this;
}
Query& Query::snapshot() {
appendComplex( "$snapshot", true );
return *this;
}
Query& Query::minKey( const BSONObj &val ) {
appendComplex( "$min", val );
return *this;
}
Query& Query::maxKey( const BSONObj &val ) {
appendComplex( "$max", val );
return *this;
}
bool Query::isComplex( bool * hasDollar ) const{
if ( obj.hasElement( "query" ) ){
if ( hasDollar )
hasDollar[0] = false;
return true;
}
if ( obj.hasElement( "$query" ) ){
if ( hasDollar )
hasDollar[0] = true;
return true;
}
return false;
}
BSONObj Query::getFilter() const {
bool hasDollar;
if ( ! isComplex( &hasDollar ) )
return obj;
return obj.getObjectField( hasDollar ? "$query" : "query" );
}
BSONObj Query::getSort() const {
if ( ! isComplex() )
return BSONObj();
BSONObj ret = obj.getObjectField( "orderby" );
if (ret.isEmpty())
ret = obj.getObjectField( "$orderby" );
return ret;
}
BSONObj Query::getHint() const {
if ( ! isComplex() )
return BSONObj();
return obj.getObjectField( "$hint" );
}
bool Query::isExplain() const {
return isComplex() && obj.getBoolField( "$explain" );
}
string Query::toString() const{
return obj.toString();
}
/* --- dbclientcommands --- */
bool DBClientWithCommands::isOk(const BSONObj& o) {
return o["ok"].trueValue();
}
enum QueryOptions DBClientWithCommands::availableOptions() {
if ( !_haveCachedAvailableOptions ) {
BSONObj ret;
if ( runCommand( "admin", BSON( "availablequeryoptions" << 1 ), ret ) ) {
_cachedAvailableOptions = ( enum QueryOptions )( ret.getIntField( "options" ) );
}
_haveCachedAvailableOptions = true;
}
return _cachedAvailableOptions;
}
inline bool DBClientWithCommands::runCommand(const string &dbname, const BSONObj& cmd, BSONObj &info, int options) {
string ns = dbname + ".$cmd";
info = findOne(ns, cmd, 0 , options);
return isOk(info);
}
/* note - we build a bson obj here -- for something that is super common like getlasterror you
should have that object prebuilt as that would be faster.
*/
bool DBClientWithCommands::simpleCommand(const string &dbname, BSONObj *info, const string &command) {
BSONObj o;
if ( info == 0 )
info = &o;
BSONObjBuilder b;
b.append(command, 1);
return runCommand(dbname, b.done(), *info);
}
unsigned long long DBClientWithCommands::count(const string &_ns, const BSONObj& query, int options) {
NamespaceString ns(_ns);
BSONObj cmd = BSON( "count" << ns.coll << "query" << query );
BSONObj res;
if( !runCommand(ns.db.c_str(), cmd, res, options) )
uasserted(11010,string("count fails:") + res.toString());
return res["n"].numberLong();
}
BSONObj getlasterrorcmdobj = fromjson("{getlasterror:1}");
BSONObj DBClientWithCommands::getLastErrorDetailed() {
BSONObj info;
runCommand("admin", getlasterrorcmdobj, info);
return info;
}
string DBClientWithCommands::getLastError() {
BSONObj info = getLastErrorDetailed();
return getLastErrorString( info );
}
string DBClientWithCommands::getLastErrorString( const BSONObj& info ){
BSONElement e = info["err"];
if( e.eoo() ) return "";
if( e.type() == Object ) return e.toString();
return e.str();
}
BSONObj getpreverrorcmdobj = fromjson("{getpreverror:1}");
BSONObj DBClientWithCommands::getPrevError() {
BSONObj info;
runCommand("admin", getpreverrorcmdobj, info);
return info;
}
BSONObj getnoncecmdobj = fromjson("{getnonce:1}");
string DBClientWithCommands::createPasswordDigest( const string & username , const string & clearTextPassword ){
md5digest d;
{
md5_state_t st;
md5_init(&st);
md5_append(&st, (const md5_byte_t *) username.data(), username.length());
md5_append(&st, (const md5_byte_t *) ":mongo:", 7 );
md5_append(&st, (const md5_byte_t *) clearTextPassword.data(), clearTextPassword.length());
md5_finish(&st, d);
}
return digestToString( d );
}
bool DBClientWithCommands::auth(const string &dbname, const string &username, const string &password_text, string& errmsg, bool digestPassword) {
//cout << "TEMP AUTH " << toString() << dbname << ' ' << username << ' ' << password_text << ' ' << digestPassword << endl;
string password = password_text;
if( digestPassword )
password = createPasswordDigest( username , password_text );
BSONObj info;
string nonce;
if( !runCommand(dbname, getnoncecmdobj, info) ) {
errmsg = "getnonce fails - connection problem?";
return false;
}
{
BSONElement e = info.getField("nonce");
assert( e.type() == String );
nonce = e.valuestr();
}
BSONObj authCmd;
BSONObjBuilder b;
{
b << "authenticate" << 1 << "nonce" << nonce << "user" << username;
md5digest d;
{
md5_state_t st;
md5_init(&st);
md5_append(&st, (const md5_byte_t *) nonce.c_str(), nonce.size() );
md5_append(&st, (const md5_byte_t *) username.data(), username.length());
md5_append(&st, (const md5_byte_t *) password.c_str(), password.size() );
md5_finish(&st, d);
}
b << "key" << digestToString( d );
authCmd = b.done();
}
if( runCommand(dbname, authCmd, info) )
return true;
errmsg = info.toString();
return false;
}
BSONObj ismastercmdobj = fromjson("{\"ismaster\":1}");
bool DBClientWithCommands::isMaster(bool& isMaster, BSONObj *info) {
BSONObj o;
if ( info == 0 )
info = &o;
bool ok = runCommand("admin", ismastercmdobj, *info);
isMaster = info->getField("ismaster").trueValue();
return ok;
}
bool DBClientWithCommands::createCollection(const string &ns, long long size, bool capped, int max, BSONObj *info) {
BSONObj o;
if ( info == 0 ) info = &o;
BSONObjBuilder b;
string db = nsToDatabase(ns.c_str());
b.append("create", ns.c_str() + db.length() + 1);
if ( size ) b.append("size", size);
if ( capped ) b.append("capped", true);
if ( max ) b.append("max", max);
return runCommand(db.c_str(), b.done(), *info);
}
bool DBClientWithCommands::copyDatabase(const string &fromdb, const string &todb, const string &fromhost, BSONObj *info) {
BSONObj o;
if ( info == 0 ) info = &o;
BSONObjBuilder b;
b.append("copydb", 1);
b.append("fromhost", fromhost);
b.append("fromdb", fromdb);
b.append("todb", todb);
return runCommand("admin", b.done(), *info);
}
bool DBClientWithCommands::setDbProfilingLevel(const string &dbname, ProfilingLevel level, BSONObj *info ) {
BSONObj o;
if ( info == 0 ) info = &o;
if ( level ) {
// Create system.profile collection. If it already exists this does nothing.
// TODO: move this into the db instead of here so that all
// drivers don't have to do this.
string ns = dbname + ".system.profile";
createCollection(ns.c_str(), 1024 * 1024, true, 0, info);
}
BSONObjBuilder b;
b.append("profile", (int) level);
return runCommand(dbname, b.done(), *info);
}
BSONObj getprofilingcmdobj = fromjson("{\"profile\":-1}");
bool DBClientWithCommands::getDbProfilingLevel(const string &dbname, ProfilingLevel& level, BSONObj *info) {
BSONObj o;
if ( info == 0 ) info = &o;
if ( runCommand(dbname, getprofilingcmdobj, *info) ) {
level = (ProfilingLevel) info->getIntField("was");
return true;
}
return false;
}
BSONObj DBClientWithCommands::mapreduce(const string &ns, const string &jsmapf, const string &jsreducef, BSONObj query, const string& outputcolname) {
BSONObjBuilder b;
b.append("mapreduce", nsGetCollection(ns));
b.appendCode("map", jsmapf.c_str());
b.appendCode("reduce", jsreducef.c_str());
if( !query.isEmpty() )
b.append("query", query);
if( !outputcolname.empty() )
b.append("out", outputcolname);
BSONObj info;
runCommand(nsGetDB(ns), b.done(), info);
return info;
}
bool DBClientWithCommands::eval(const string &dbname, const string &jscode, BSONObj& info, BSONElement& retValue, BSONObj *args) {
BSONObjBuilder b;
b.appendCode("$eval", jscode.c_str());
if ( args )
b.appendArray("args", *args);
bool ok = runCommand(dbname, b.done(), info);
if ( ok )
retValue = info.getField("retval");
return ok;
}
bool DBClientWithCommands::eval(const string &dbname, const string &jscode) {
BSONObj info;
BSONElement retValue;
return eval(dbname, jscode, info, retValue);
}
list<string> DBClientWithCommands::getDatabaseNames(){
BSONObj info;
uassert( 10005 , "listdatabases failed" , runCommand( "admin" , BSON( "listDatabases" << 1 ) , info ) );
uassert( 10006 , "listDatabases.databases not array" , info["databases"].type() == Array );
list<string> names;
BSONObjIterator i( info["databases"].embeddedObjectUserCheck() );
while ( i.more() ){
names.push_back( i.next().embeddedObjectUserCheck()["name"].valuestr() );
}
return names;
}
list<string> DBClientWithCommands::getCollectionNames( const string& db ){
list<string> names;
string ns = db + ".system.namespaces";
auto_ptr<DBClientCursor> c = query( ns.c_str() , BSONObj() );
while ( c->more() ){
string name = c->next()["name"].valuestr();
if ( name.find( "$" ) != string::npos )
continue;
names.push_back( name );
}
return names;
}
bool DBClientWithCommands::exists( const string& ns ){
list<string> names;
string db = nsGetDB( ns ) + ".system.namespaces";
BSONObj q = BSON( "name" << ns );
return count( db.c_str() , q ) != 0;
}
/* --- dbclientconnection --- */
bool DBClientConnection::auth(const string &dbname, const string &username, const string &password_text, string& errmsg, bool digestPassword) {
string password = password_text;
if( digestPassword )
password = createPasswordDigest( username , password_text );
if( autoReconnect ) {
/* note we remember the auth info before we attempt to auth -- if the connection is broken, we will
then have it for the next autoreconnect attempt.
*/
pair<string,string> p = pair<string,string>(username, password);
authCache[dbname] = p;
}
return DBClientBase::auth(dbname, username, password.c_str(), errmsg, false);
}
BSONObj DBClientInterface::findOne(const string &ns, const Query& query, const BSONObj *fieldsToReturn, int queryOptions) {
auto_ptr<DBClientCursor> c =
this->query(ns, query, 1, 0, fieldsToReturn, queryOptions);
uassert( 10276 , "DBClientBase::findOne: transport error", c.get() );
if ( c->hasResultFlag( ResultFlag_ShardConfigStale ) )
throw StaleConfigException( ns , "findOne has stale config" );
if ( !c->more() )
return BSONObj();
return c->nextSafe().copy();
}
bool DBClientConnection::connect(const HostAndPort& server, string& errmsg){
_server = server;
_serverString = _server.toString();
return _connect( errmsg );
}
bool DBClientConnection::_connect( string& errmsg ){
_serverString = _server.toString();
// we keep around SockAddr for connection life -- maybe MessagingPort
// requires that?
server.reset(new SockAddr(_server.host().c_str(), _server.port()));
p.reset(new MessagingPort( _timeout, _logLevel ));
if (server->getAddr() == "0.0.0.0"){
failed = true;
return false;
}
if ( !p->connect(*server) ) {
stringstream ss;
ss << "couldn't connect to server " << _serverString << '}';
errmsg = ss.str();
failed = true;
return false;
}
return true;
}
void DBClientConnection::_checkConnection() {
if ( !failed )
return;
if ( lastReconnectTry && time(0)-lastReconnectTry < 2 )
return;
if ( !autoReconnect )
return;
lastReconnectTry = time(0);
log(_logLevel) << "trying reconnect to " << _serverString << endl;
string errmsg;
failed = false;
if ( ! _connect(errmsg) ) {
log(_logLevel) << "reconnect " << _serverString << " failed " << errmsg << endl;
return;
}
log(_logLevel) << "reconnect " << _serverString << " ok" << endl;
for( map< string, pair<string,string> >::iterator i = authCache.begin(); i != authCache.end(); i++ ) {
const char *dbname = i->first.c_str();
const char *username = i->second.first.c_str();
const char *password = i->second.second.c_str();
if( !DBClientBase::auth(dbname, username, password, errmsg, false) )
log(_logLevel) << "reconnect: auth failed db:" << dbname << " user:" << username << ' ' << errmsg << '\n';
}
}
auto_ptr<DBClientCursor> DBClientBase::query(const string &ns, Query query, int nToReturn,
int nToSkip, const BSONObj *fieldsToReturn, int queryOptions , int batchSize ) {
auto_ptr<DBClientCursor> c( new DBClientCursor( this,
ns, query.obj, nToReturn, nToSkip,
fieldsToReturn, queryOptions , batchSize ) );
if ( c->init() )
return c;
return auto_ptr< DBClientCursor >( 0 );
}
auto_ptr<DBClientCursor> DBClientBase::getMore( const string &ns, long long cursorId, int nToReturn, int options ) {
auto_ptr<DBClientCursor> c( new DBClientCursor( this, ns, cursorId, nToReturn, options ) );
if ( c->init() )
return c;
return auto_ptr< DBClientCursor >( 0 );
}
struct DBClientFunConvertor {
void operator()( DBClientCursorBatchIterator &i ) {
while( i.moreInCurrentBatch() ) {
_f( i.nextSafe() );
}
}
boost::function<void(const BSONObj &)> _f;
};
unsigned long long DBClientConnection::query( boost::function<void(const BSONObj&)> f, const string& ns, Query query, const BSONObj *fieldsToReturn, int queryOptions ) {
DBClientFunConvertor fun;
fun._f = f;
boost::function<void(DBClientCursorBatchIterator &)> ptr( fun );
return DBClientConnection::query( ptr, ns, query, fieldsToReturn, queryOptions );
}
unsigned long long DBClientConnection::query( boost::function<void(DBClientCursorBatchIterator &)> f, const string& ns, Query query, const BSONObj *fieldsToReturn, int queryOptions ) {
// mask options
queryOptions &= (int)( QueryOption_NoCursorTimeout | QueryOption_SlaveOk );
unsigned long long n = 0;
bool doExhaust = ( availableOptions() & QueryOption_Exhaust );
if ( doExhaust ) {
queryOptions |= (int)QueryOption_Exhaust;
}
auto_ptr<DBClientCursor> c( this->query(ns, query, 0, 0, fieldsToReturn, queryOptions) );
massert( 13386, "socket error for mapping query", c.get() );
if ( !doExhaust ) {
while( c->more() ) {
DBClientCursorBatchIterator i( *c );
f( i );
n += i.n();
}
return n;
}
try {
while( 1 ) {
while( c->moreInCurrentBatch() ) {
DBClientCursorBatchIterator i( *c );
f( i );
n += i.n();
}
if( c->getCursorId() == 0 )
break;
c->exhaustReceiveMore();
}
}
catch(std::exception&) {
/* connection CANNOT be used anymore as more data may be on the way from the server.
we have to reconnect.
*/
failed = true;
p->shutdown();
throw;
}
return n;
}
void DBClientBase::insert( const string & ns , BSONObj obj ) {
Message toSend;
BufBuilder b;
int opts = 0;
b.appendNum( opts );
b.appendStr( ns );
obj.appendSelfToBufBuilder( b );
toSend.setData( dbInsert , b.buf() , b.len() );
say( toSend );
}
void DBClientBase::insert( const string & ns , const vector< BSONObj > &v ) {
Message toSend;
BufBuilder b;
int opts = 0;
b.appendNum( opts );
b.appendStr( ns );
for( vector< BSONObj >::const_iterator i = v.begin(); i != v.end(); ++i )
i->appendSelfToBufBuilder( b );
toSend.setData( dbInsert, b.buf(), b.len() );
say( toSend );
}
void DBClientBase::remove( const string & ns , Query obj , bool justOne ) {
Message toSend;
BufBuilder b;
int opts = 0;
b.appendNum( opts );
b.appendStr( ns );
int flags = 0;
if ( justOne )
flags |= RemoveOption_JustOne;
b.appendNum( flags );
obj.obj.appendSelfToBufBuilder( b );
toSend.setData( dbDelete , b.buf() , b.len() );
say( toSend );
}
void DBClientBase::update( const string & ns , Query query , BSONObj obj , bool upsert , bool multi ) {
BufBuilder b;
b.appendNum( (int)0 ); // reserved
b.appendStr( ns );
int flags = 0;
if ( upsert ) flags |= UpdateOption_Upsert;
if ( multi ) flags |= UpdateOption_Multi;
b.appendNum( flags );
query.obj.appendSelfToBufBuilder( b );
obj.appendSelfToBufBuilder( b );
Message toSend;
toSend.setData( dbUpdate , b.buf() , b.len() );
say( toSend );
}
auto_ptr<DBClientCursor> DBClientWithCommands::getIndexes( const string &ns ){
return query( Namespace( ns.c_str() ).getSisterNS( "system.indexes" ).c_str() , BSON( "ns" << ns ) );
}
void DBClientWithCommands::dropIndex( const string& ns , BSONObj keys ){
dropIndex( ns , genIndexName( keys ) );
}
void DBClientWithCommands::dropIndex( const string& ns , const string& indexName ){
BSONObj info;
if ( ! runCommand( nsToDatabase( ns.c_str() ) ,
BSON( "deleteIndexes" << NamespaceString( ns ).coll << "index" << indexName ) ,
info ) ){
log(_logLevel) << "dropIndex failed: " << info << endl;
uassert( 10007 , "dropIndex failed" , 0 );
}
resetIndexCache();
}
void DBClientWithCommands::dropIndexes( const string& ns ){
BSONObj info;
uassert( 10008 , "dropIndexes failed" , runCommand( nsToDatabase( ns.c_str() ) ,
BSON( "deleteIndexes" << NamespaceString( ns ).coll << "index" << "*") ,
info ) );
resetIndexCache();
}
void DBClientWithCommands::reIndex( const string& ns ){
list<BSONObj> all;
auto_ptr<DBClientCursor> i = getIndexes( ns );
while ( i->more() ){
all.push_back( i->next().getOwned() );
}
dropIndexes( ns );
for ( list<BSONObj>::iterator i=all.begin(); i!=all.end(); i++ ){
BSONObj o = *i;
insert( Namespace( ns.c_str() ).getSisterNS( "system.indexes" ).c_str() , o );
}
}
string DBClientWithCommands::genIndexName( const BSONObj& keys ){
stringstream ss;
bool first = 1;
for ( BSONObjIterator i(keys); i.more(); ) {
BSONElement f = i.next();
if ( first )
first = 0;
else
ss << "_";
ss << f.fieldName() << "_";
if( f.isNumber() )
ss << f.numberInt();
}
return ss.str();
}
bool DBClientWithCommands::ensureIndex( const string &ns , BSONObj keys , bool unique, const string & name ) {
BSONObjBuilder toSave;
toSave.append( "ns" , ns );
toSave.append( "key" , keys );
string cacheKey(ns);
cacheKey += "--";
if ( name != "" ) {
toSave.append( "name" , name );
cacheKey += name;
}
else {
string nn = genIndexName( keys );
toSave.append( "name" , nn );
cacheKey += nn;
}
if ( unique )
toSave.appendBool( "unique", unique );
if ( _seenIndexes.count( cacheKey ) )
return 0;
_seenIndexes.insert( cacheKey );
insert( Namespace( ns.c_str() ).getSisterNS( "system.indexes" ).c_str() , toSave.obj() );
return 1;
}
void DBClientWithCommands::resetIndexCache() {
_seenIndexes.clear();
}
/* -- DBClientCursor ---------------------------------------------- */
#ifdef _DEBUG
#define CHECK_OBJECT( o , msg ) massert( 10337 , (string)"object not valid" + (msg) , (o).isValid() )
#else
#define CHECK_OBJECT( o , msg )
#endif
void assembleRequest( const string &ns, BSONObj query, int nToReturn, int nToSkip, const BSONObj *fieldsToReturn, int queryOptions, Message &toSend ) {
CHECK_OBJECT( query , "assembleRequest query" );
// see query.h for the protocol we are using here.
BufBuilder b;
int opts = queryOptions;
b.appendNum(opts);
b.appendStr(ns);
b.appendNum(nToSkip);
b.appendNum(nToReturn);
query.appendSelfToBufBuilder(b);
if ( fieldsToReturn )
fieldsToReturn->appendSelfToBufBuilder(b);
toSend.setData(dbQuery, b.buf(), b.len());
}
void DBClientConnection::say( Message &toSend ) {
checkConnection();
try {
port().say( toSend );
} catch( SocketException & ) {
failed = true;
throw;
}
}
void DBClientConnection::sayPiggyBack( Message &toSend ) {
port().piggyBack( toSend );
}
void DBClientConnection::recv( Message &m ) {
port().recv(m);
}
bool DBClientConnection::call( Message &toSend, Message &response, bool assertOk ) {
/* todo: this is very ugly messagingport::call returns an error code AND can throw
an exception. we should make it return void and just throw an exception anytime
it fails
*/
try {
if ( !port().call(toSend, response) ) {
failed = true;
if ( assertOk )
uassert( 10278 , "dbclient error communicating with server", false);
return false;
}
}
catch( SocketException & ) {
failed = true;
throw;
}
return true;
}
void DBClientConnection::checkResponse( const char *data, int nReturned ) {
/* check for errors. the only one we really care about at
this stage is "not master" */
if ( clientSet && nReturned ) {
assert(data);
BSONObj o(data);
BSONElement e = o.firstElement();
if ( strcmp(e.fieldName(), "$err") == 0 &&
e.type() == String && strncmp(e.valuestr(), "not master", 10) == 0 ) {
clientSet->isntMaster();
}
}
}
void DBClientConnection::killCursor( long long cursorId ){
BufBuilder b;
b.appendNum( (int)0 ); // reserved
b.appendNum( (int)1 ); // number
b.appendNum( cursorId );
Message m;
m.setData( dbKillCursors , b.buf() , b.len() );
sayPiggyBack( m );
}
/* --- class dbclientpaired --- */
string DBClientReplicaSet::toString() {
return getServerAddress();
}
DBClientReplicaSet::DBClientReplicaSet( const string& name , const vector<HostAndPort>& servers )
: _name( name ) , _currentMaster( 0 ), _servers( servers ){
for ( unsigned i=0; i<_servers.size(); i++ )
_conns.push_back( new DBClientConnection( true , this ) );
}
DBClientReplicaSet::~DBClientReplicaSet(){
for ( unsigned i=0; i<_conns.size(); i++ )
delete _conns[i];
_conns.clear();
}
string DBClientReplicaSet::getServerAddress() const {
StringBuilder ss;
if ( _name.size() )
ss << _name << "/";
for ( unsigned i=0; i<_servers.size(); i++ ){
if ( i > 0 )
ss << ",";
ss << _servers[i].toString();
}
return ss.str();
}
/* find which server, the left or right, is currently master mode */
void DBClientReplicaSet::_checkMaster() {
bool triedQuickCheck = false;
log( _logLevel + 1) << "_checkMaster on: " << toString() << endl;
for ( int retry = 0; retry < 2; retry++ ) {
for ( unsigned i=0; i<_conns.size(); i++ ){
DBClientConnection * c = _conns[i];
try {
bool im;
BSONObj o;
c->isMaster(im, &o);
if ( retry )
log(_logLevel) << "checkmaster: " << c->toString() << ' ' << o << '\n';
string maybePrimary;
if ( o["hosts"].type() == Array ){
if ( o["primary"].type() == String )
maybePrimary = o["primary"].String();
BSONObjIterator hi(o["hosts"].Obj());
while ( hi.more() ){
string toCheck = hi.next().String();
int found = -1;
for ( unsigned x=0; x<_servers.size(); x++ ){
if ( toCheck == _servers[x].toString() ){
found = x;
break;
}
}
if ( found == -1 ){
HostAndPort h( toCheck );
_servers.push_back( h );
_conns.push_back( new DBClientConnection( true, this ) );
string temp;
_conns[ _conns.size() - 1 ]->connect( h , temp );
log( _logLevel ) << "updated set to: " << toString() << endl;
}
}
}
if ( im ) {
_currentMaster = c;
return;
}
if ( maybePrimary.size() && ! triedQuickCheck ){
for ( unsigned x=0; x<_servers.size(); x++ ){
if ( _servers[i].toString() != maybePrimary )
continue;
triedQuickCheck = true;
_conns[x]->isMaster( im , &o );
if ( im ){
_currentMaster = _conns[x];
return;
}
}
}
}
catch ( std::exception& e ) {
if ( retry )
log(_logLevel) << "checkmaster: caught exception " << c->toString() << ' ' << e.what() << endl;
}
}
sleepsecs(1);
}
uassert( 10009 , "checkmaster: no master found", false);
}
DBClientConnection * DBClientReplicaSet::checkMaster() {
if ( _currentMaster ){
// a master is selected. let's just make sure connection didn't die
if ( ! _currentMaster->isFailed() )
return _currentMaster;
_currentMaster = 0;
}
_checkMaster();
assert( _currentMaster );
return _currentMaster;
}
DBClientConnection& DBClientReplicaSet::masterConn(){
return *checkMaster();
}
DBClientConnection& DBClientReplicaSet::slaveConn(){
DBClientConnection * m = checkMaster();
assert( ! m->isFailed() );
DBClientConnection * failedSlave = 0;