mirror of
https://github.com/mongodb/mongo.git
synced 2024-11-30 00:56:44 +01:00
533 lines
19 KiB
C++
533 lines
19 KiB
C++
// dbgrid/request.cpp
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/**
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* Copyright (C) 2008 10gen Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* TODO
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_ concurrency control.
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_ limit() works right?
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_ KillCursors
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later
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_ secondary indexes
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*/
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#include "stdafx.h"
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#include "../util/message.h"
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#include "../db/dbmessage.h"
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#include "../client/connpool.h"
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#include "../db/commands.h"
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#include "config.h"
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#include "shard.h"
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namespace mongo {
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extern string ourHostname;
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namespace dbgrid_cmds {
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set<string> dbgridCommands;
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class GridAdminCmd : public Command {
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public:
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GridAdminCmd( const char * n ) : Command( n ){
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dbgridCommands.insert( n );
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}
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virtual bool slaveOk(){
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return true;
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}
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virtual bool adminOnly() {
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return true;
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}
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};
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// --------------- misc commands ----------------------
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class NetStatCmd : public GridAdminCmd {
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public:
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NetStatCmd() : GridAdminCmd("netstat") { }
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bool run(const char *ns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool){
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result.append("configserver", configServer.getPrimary() );
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result.append("isdbgrid", 1);
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return true;
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}
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} netstat;
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class ListGridCommands : public GridAdminCmd {
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public:
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ListGridCommands() : GridAdminCmd("gridcommands") { }
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bool run(const char *ns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool){
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BSONObjBuilder arr;
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int num=0;
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for ( set<string>::iterator i = dbgridCommands.begin(); i != dbgridCommands.end(); i++ ){
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string s = BSONObjBuilder::numStr( num++ );
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arr.append( s.c_str() , *i );
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}
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result.appendArray( "commands" , arr.done() );
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result.append("ok" , 1 );
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return true;
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}
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} listGridCommands;
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// ------------ database level commands -------------
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class ListDatabaseCommand : public GridAdminCmd {
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public:
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ListDatabaseCommand() : GridAdminCmd("listdatabases") { }
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bool run(const char *ns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool){
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ScopedDbConnection conn( configServer.getPrimary() );
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auto_ptr<DBClientCursor> cursor = conn->query( "config.databases" , emptyObj );
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BSONObjBuilder list;
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int num = 0;
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while ( cursor->more() ){
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string s = BSONObjBuilder::numStr( num++ );
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BSONObj o = cursor->next();
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list.append( s.c_str() , o["name"].valuestrsafe() );
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}
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result.appendArray("databases" , list.obj() );
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conn.done();
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return true;
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}
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} gridListDatabase;
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class MoveDatabasePrimaryCommand : public GridAdminCmd {
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public:
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MoveDatabasePrimaryCommand() : GridAdminCmd("moveprimary") { }
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virtual void help( stringstream& help ) const {
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help << " example: { moveprimary : 'foo' , to : 'localhost:9999' } TODO: locking? ";
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}
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bool run(const char *ns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool){
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string dbname = cmdObj["moveprimary"].valuestrsafe();
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if ( dbname.size() == 0 ){
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errmsg = "no db";
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return false;
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}
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if ( dbname == "config" ){
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errmsg = "can't move config db";
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return false;
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}
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DBConfig * config = grid.getDBConfig( dbname , false );
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if ( ! config ){
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errmsg = "can't find db!";
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return false;
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}
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string to = cmdObj["to"].valuestrsafe();
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if ( ! to.size() ){
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errmsg = "you have to specify where you want to move it";
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return false;
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}
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if ( to == config->getPrimary() ){
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errmsg = "thats already the primary";
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return false;
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}
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if ( ! grid.knowAboutServer( to ) ){
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errmsg = "that server isn't known to me";
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return false;
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}
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ScopedDbConnection conn( configServer.getPrimary() );
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log() << "moving " << dbname << " primary from: " << config->getPrimary() << " to: " << to << endl;
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// TODO LOCKING: this is not safe with multiple mongos
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ScopedDbConnection toconn( to );
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// TODO AARON - we need a clone command which replays operations from clone start to now
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// using a seperate smaller oplog
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BSONObj cloneRes;
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bool worked = toconn->runCommand( dbname.c_str() , BSON( "clone" << config->getPrimary() ) , cloneRes );
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toconn.done();
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if ( ! worked ){
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log() << "clone failed" << cloneRes << endl;
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errmsg = "clone failed";
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conn.done();
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return false;
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}
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ScopedDbConnection fromconn( config->getPrimary() );
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config->setPrimary( to );
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config->save( true );
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log() << " dropping " << dbname << " from old" << endl;
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fromconn->dropDatabase( dbname.c_str() );
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fromconn.done();
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result << "ok" << 1;
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result << "primary" << to;
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conn.done();
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return true;
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}
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} movePrimary;
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class PartitionCmd : public GridAdminCmd {
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public:
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PartitionCmd() : GridAdminCmd( "partition" ){}
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virtual void help( stringstream& help ) const {
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help
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<< "turns on partitioning for a db. have to do this before sharding, etc.. will work.\n"
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<< " { partition : \"alleyinsider\" }\n";
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}
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bool run(const char *ns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool){
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string dbname = cmdObj["partition"].valuestrsafe();
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if ( dbname.size() == 0 ){
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errmsg = "no db";
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return false;
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}
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DBConfig * config = grid.getDBConfig( dbname );
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if ( config->isPartitioned() ){
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errmsg = "already partitioned";
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return false;
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}
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config->turnOnPartitioning();
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config->save( true );
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result << "ok" << 1;
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return true;
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}
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} partitionCmd;
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// ------------ collection level commands -------------
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class ShardCmd : public GridAdminCmd {
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public:
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ShardCmd() : GridAdminCmd( "shard" ){}
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bool run(const char *cmdns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool){
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string ns = cmdObj["shard"].valuestrsafe();
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if ( ns.size() == 0 ){
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errmsg = "no ns";
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return false;
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}
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DBConfig * config = grid.getDBConfig( ns );
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if ( ! config->isPartitioned() ){
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errmsg = "db not partitioned ";
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return false;
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}
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if ( config->sharded( ns ) ){
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errmsg = "already sharded";
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return false;
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}
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BSONObj key = cmdObj.getObjectField( "key" );
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if ( key.isEmpty() ){
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errmsg = "no shard key";
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return false;
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}
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config->turnOnSharding( ns , key );
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config->save( true );
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result << "ok" << 1;
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return true;
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}
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} shardCmd;
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class SplitCollection : public GridAdminCmd {
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public:
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SplitCollection() : GridAdminCmd( "split" ){}
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virtual void help( stringstream& help ) const {
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help
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<< " example: { shard : 'alleyinsider.blog.posts' , find : { ts : 1 } } - split the shard that contains give key \n"
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<< " example: { shard : 'alleyinsider.blog.posts' , middle : { ts : 1 } } - split the shard that contains the key with this as the middle \n"
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<< " NOTE: this does not move move the chunks, it merely creates a logical seperation \n"
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;
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}
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bool run(const char *cmdns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool){
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string ns = cmdObj["split"].valuestrsafe();
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if ( ns.size() == 0 ){
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errmsg = "no ns";
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return false;
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}
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DBConfig * config = grid.getDBConfig( ns );
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if ( ! config->sharded( ns ) ){
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errmsg = "ns not sharded. have to shard before can split";
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return false;
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}
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BSONObj find = cmdObj.getObjectField( "find" );
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bool middle = false;
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if ( find.isEmpty() ){
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find = cmdObj.getObjectField( "middle" );
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middle = true;
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}
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if ( find.isEmpty() ){
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errmsg = "need to specify find or middle";
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return false;
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}
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ShardManager * info = config->getShardManager( ns );
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Shard& old = info->findShard( find );
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log() << "splitting: " << ns << " on: " << find << endl;
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if ( middle )
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old.split( cmdObj.getObjectField( "middle" ) );
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else
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old.split();
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info->save();
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result << "ok" << 1;
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return true;
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}
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} splitCollectionCmd;
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class MoveShard : public GridAdminCmd {
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public:
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MoveShard() : GridAdminCmd( "moveshard" ){}
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virtual void help( stringstream& help ) const {
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help << "{ moveshard : 'test.foo' , find : { num : 1 } , to : 'localhost:30001' }";
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}
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bool run(const char *cmdns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool){
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string ns = cmdObj["moveshard"].valuestrsafe();
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if ( ns.size() == 0 ){
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errmsg = "no ns";
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return false;
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}
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DBConfig * config = grid.getDBConfig( ns );
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if ( ! config->sharded( ns ) ){
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errmsg = "ns not sharded. have to split before can move a shard";
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return false;
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}
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BSONObj find = cmdObj.getObjectField( "find" );
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if ( find.isEmpty() ){
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errmsg = "need to specify find. see help";
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return false;
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}
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string to = cmdObj["to"].valuestrsafe();
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if ( ! to.size() ){
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errmsg = "you have to specify where you want to move it";
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return false;
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}
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ShardManager * info = config->getShardManager( ns );
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Shard& s = info->findShard( find );
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string from = s.getServer();
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if ( s.getServer() == to ){
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errmsg = "that shard is already on that server";
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return false;
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}
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if ( ! grid.knowAboutServer( to ) ){
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errmsg = "that server isn't known to me";
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return false;
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}
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log() << "ns: " << ns << " moving shard: " << s << " to: " << to << endl;
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// copyCollection
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ScopedDbConnection toconn( to );
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BSONObj cloneRes;
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BSONObj filter;
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{
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BSONObjBuilder b;
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s.getFilter( b );
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filter = b.obj();
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}
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bool worked = toconn->runCommand( config->getName().c_str() ,
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BSON( "cloneCollection" << ns <<
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"from" << from <<
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"query" << filter
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) ,
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cloneRes
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);
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toconn.done();
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if ( ! worked ){
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errmsg = (string)"cloneCollection failed: " + cloneRes.toString();
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return false;
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}
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// update config db
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s.setServer( to );
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info->save();
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// delete old data
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ScopedDbConnection fromconn( from );
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fromconn->remove( ns.c_str() , filter );
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string removeerror = fromconn->getLastError();
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fromconn.done();
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if ( removeerror.size() ){
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errmsg = (string)"error removing old data:" + removeerror;
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return false;
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}
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result << "ok" << 1;
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return true;
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}
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} moveShardCmd;
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// ------------ server level commands -------------
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class ListServers : public GridAdminCmd {
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public:
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ListServers() : GridAdminCmd("listservers") { }
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bool run(const char *ns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool){
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ScopedDbConnection conn( configServer.getPrimary() );
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vector<BSONObj> all;
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auto_ptr<DBClientCursor> cursor = conn->query( "config.servers" , emptyObj );
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while ( cursor->more() ){
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BSONObj o = cursor->next();
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all.push_back( o );
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}
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result.append("servers" , all );
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result.append("ok" , 1 );
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conn.done();
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return true;
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}
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} listServers;
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class AddServer : public GridAdminCmd {
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public:
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AddServer() : GridAdminCmd("addserver") { }
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bool run(const char *ns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool){
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ScopedDbConnection conn( configServer.getPrimary() );
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BSONObj server = BSON( "host" << cmdObj["addserver"].valuestrsafe() );
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BSONObj old = conn->findOne( "config.servers" , server );
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if ( ! old.isEmpty() ){
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result.append( "ok" , 0.0 );
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result.append( "msg" , "already exists" );
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conn.done();
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return false;
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}
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conn->insert( "config.servers" , server );
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result.append( "ok", 1 );
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result.append( "added" , server["host"].valuestrsafe() );
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conn.done();
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return true;
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}
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} addServer;
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class RemoveServer : public GridAdminCmd {
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public:
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RemoveServer() : GridAdminCmd("removeserver") { }
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bool run(const char *ns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool){
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ScopedDbConnection conn( configServer.getPrimary() );
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BSONObj server = BSON( "host" << cmdObj["removeserver"].valuestrsafe() );
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conn->remove( "config.servers" , server );
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conn.done();
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return true;
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}
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} removeServer;
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// --------------- public commands ----------------
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class IsDbGridCmd : public Command {
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public:
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virtual bool slaveOk() {
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return true;
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}
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IsDbGridCmd() : Command("isdbgrid") { }
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bool run(const char *ns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool) {
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result.append("isdbgrid", 1);
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result.append("hostname", ourHostname);
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return true;
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}
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} isdbgrid;
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class CmdIsMaster : public Command {
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public:
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virtual bool requiresAuth() { return false; }
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virtual bool slaveOk() {
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return true;
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}
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CmdIsMaster() : Command("ismaster") { }
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virtual bool run(const char *ns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool) {
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result.append("ismaster", 0.0);
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result.append("msg", "isdbgrid");
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return true;
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}
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} ismaster;
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class CmdShardGetPrevError : public Command {
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public:
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virtual bool requiresAuth() { return false; }
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virtual bool slaveOk() {
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return true;
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}
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CmdShardGetPrevError() : Command("getpreverror") { }
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virtual bool run(const char *ns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool) {
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errmsg += "getpreverror not supported on mongos";
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result << "ok" << 0;
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return false;
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}
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} cmdGetPrevError;
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class CmdShardGetLastError : public Command {
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public:
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virtual bool requiresAuth() { return false; }
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virtual bool slaveOk() {
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return true;
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}
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CmdShardGetLastError() : Command("getplasterror") { }
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virtual bool run(const char *ns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool) {
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errmsg += "getlasterror not working yet";
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result << "ok" << 0;
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return false;
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}
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} cmdGetLastError;
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}
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} // namespace mongo
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