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292 lines
11 KiB
C++
292 lines
11 KiB
C++
// cloner.cpp - copy a database (export/import basically)
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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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#include "stdafx.h"
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#include "pdfile.h"
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#include "../client/dbclient.h"
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#include "../util/builder.h"
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#include "jsobj.h"
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#include "query.h"
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#include "commands.h"
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#include "db.h"
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#include "instance.h"
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#include "repl.h"
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namespace mongo {
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void ensureHaveIdIndex(const char *ns);
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extern int port;
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bool replAuthenticate(DBClientConnection *);
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class Cloner: boost::noncopyable {
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auto_ptr< DBClientInterface > conn;
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void copy(const char *from_ns, const char *to_ns, bool isindex, bool logForRepl,
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bool masterSameProcess, bool slaveOk);
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public:
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Cloner() { }
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/* slaveOk - if true it is ok if the source of the data is !ismaster.
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useReplAuth - use the credentials we normally use as a replication slave for the cloning
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*/
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bool go(const char *masterHost, string& errmsg, const string& fromdb, bool logForRepl, bool slaveOk, bool useReplAuth);
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};
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/* for index info object:
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{ "name" : "name_1" , "ns" : "foo.index3" , "key" : { "name" : 1.0 } }
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we need to fix up the value in the "ns" parameter so that the name prefix is correct on a
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copy to a new name.
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*/
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BSONObj fixindex(BSONObj o) {
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BSONObjBuilder b;
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BSONObjIterator i(o);
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while ( i.more() ) {
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BSONElement e = i.next();
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if ( e.eoo() )
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break;
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if ( string("ns") == e.fieldName() ) {
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uassert("bad ns field for index during dbcopy", e.type() == String);
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const char *p = strchr(e.valuestr(), '.');
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uassert("bad ns field for index during dbcopy [2]", p);
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string newname = database->name + p;
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b.append("ns", newname);
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}
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else
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b.append(e);
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}
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BSONObj res= b.obj();
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/* if( mod ) {
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out() << "before: " << o.toString() << endl;
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o.dump();
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out() << "after: " << res.toString() << endl;
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res.dump();
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}*/
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return res;
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}
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/* copy the specified collection
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isindex - if true, this is system.indexes collection, in which we do some transformation when copying.
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*/
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void Cloner::copy(const char *from_collection, const char *to_collection, bool isindex, bool logForRepl, bool masterSameProcess, bool slaveOk) {
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auto_ptr<DBClientCursor> c;
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{
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dbtemprelease r;
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c = conn->query( from_collection, emptyObj, 0, 0, 0, slaveOk ? Option_SlaveOk : 0 );
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}
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assert( c.get() );
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while ( 1 ) {
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{
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dbtemprelease r;
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if ( !c->more() )
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break;
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}
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BSONObj tmp = c->next();
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/* assure object is valid. note this will slow us down a good bit. */
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if ( !tmp.valid() ) {
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out() << "skipping corrupt object from " << from_collection << '\n';
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continue;
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}
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BSONObj js = tmp;
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if ( isindex ) {
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assert( strstr(from_collection, "system.indexes") );
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js = fixindex(tmp);
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}
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try {
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theDataFileMgr.insert(to_collection, js);
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if ( logForRepl )
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logOp("i", to_collection, js);
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}
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catch( UserException& e ) {
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log() << "warning: exception cloning object in " << from_collection << ' ' << e.what() << " obj:" << js.toString() << '\n';
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}
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}
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}
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bool Cloner::go(const char *masterHost, string& errmsg, const string& fromdb, bool logForRepl, bool slaveOk, bool useReplAuth) {
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massert( "useReplAuth is not written to replication log", !useReplAuth || !logForRepl );
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string todb = database->name;
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stringstream a,b;
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a << "localhost:" << port;
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b << "127.0.0.1:" << port;
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bool masterSameProcess = ( a.str() == masterHost || b.str() == masterHost );
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if ( masterSameProcess ) {
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if ( fromdb == todb && database->path == dbpath ) {
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// guard against an "infinite" loop
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/* if you are replicating, the local.sources config may be wrong if you get this */
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errmsg = "can't clone from self (localhost).";
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return false;
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}
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}
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/* todo: we can put thesee releases inside dbclient or a dbclient specialization.
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or just wait until we get rid of global lock anyway.
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*/
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string ns = fromdb + ".system.namespaces";
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auto_ptr<DBClientCursor> c;
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{
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dbtemprelease r;
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if ( !masterSameProcess ) {
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auto_ptr< DBClientConnection > c( new DBClientConnection() );
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if ( !c->connect( masterHost, errmsg ) )
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return false;
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if( !replAuthenticate(c.get()) )
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return false;
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conn = c;
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} else {
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conn = auto_ptr< DBClientInterface >( new DBDirectClient() );
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}
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c = conn->query( ns.c_str(), emptyObj, 0, 0, 0, slaveOk ? Option_SlaveOk : 0 );
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}
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if ( c.get() == 0 ) {
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errmsg = "query failed " + ns;
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return false;
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}
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while ( 1 ) {
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{
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dbtemprelease r;
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if ( !c->more() )
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break;
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}
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BSONObj collection = c->next();
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BSONElement e = collection.findElement("name");
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if ( e.eoo() ) {
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string s = "bad system.namespaces object " + collection.toString();
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/* temp
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out() << masterHost << endl;
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out() << ns << endl;
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out() << e.toString() << endl;
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exit(1);*/
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massert(s.c_str(), false);
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}
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assert( !e.eoo() );
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assert( e.type() == String );
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const char *from_name = e.valuestr();
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if( strstr(from_name, ".system.") ) {
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/* system.users is cloned -- but nothing else from system. */
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if( strstr(from_name, ".system.users") == 0 )
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continue;
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}
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else if( strchr(from_name, '$') ) {
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// don't clone index namespaces -- we take care of those separately below.
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continue;
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}
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BSONObj options = collection.getObjectField("options");
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/* change name "<fromdb>.collection" -> <todb>.collection */
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const char *p = strchr(from_name, '.');
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assert(p);
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string to_name = todb + p;
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//if( !options.isEmpty() )
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{
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string err;
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const char *toname = to_name.c_str();
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userCreateNS(toname, options, err, logForRepl);
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/* chunks are big enough that we should create the _id index up front, that should
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be faster. perhaps we should do that for everything? Not doing that yet -- not sure
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how we want to handle _id-less collections, and we might not want to create the index
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there.
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*/
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if ( strstr(toname, "._chunks") )
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ensureHaveIdIndex(toname);
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}
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copy(from_name, to_name.c_str(), false, logForRepl, masterSameProcess, slaveOk);
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}
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// now build the indexes
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string system_indexes_from = fromdb + ".system.indexes";
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string system_indexes_to = todb + ".system.indexes";
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copy(system_indexes_from.c_str(), system_indexes_to.c_str(), true, logForRepl, masterSameProcess, slaveOk);
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return true;
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}
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bool cloneFrom(const char *masterHost, string& errmsg, const string& fromdb, bool logForReplication,
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bool slaveOk, bool useReplAuth)
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{
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Cloner c;
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return c.go(masterHost, errmsg, fromdb, logForReplication, slaveOk, useReplAuth);
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}
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/* Usage:
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mydb.$cmd.findOne( { clone: "fromhost" } );
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*/
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class CmdClone : public Command {
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public:
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virtual bool slaveOk() {
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return false;
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}
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CmdClone() : Command("clone") { }
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virtual bool run(const char *ns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool fromRepl) {
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string from = cmdObj.getStringField("clone");
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if ( from.empty() )
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return false;
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/* replication note: we must logOp() not the command, but the cloned data -- if the slave
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were to clone it would get a different point-in-time and not match.
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*/
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return cloneFrom(from.c_str(), errmsg, database->name, /*logForReplication=*/!fromRepl, /*slaveok*/false, /*usereplauth*/false);
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}
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} cmdclone;
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/* Usage:
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admindb.$cmd.findOne( { copydb: 1, fromhost: <hostname>, fromdb: <db>, todb: <db> } );
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*/
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class CmdCopyDb : public Command {
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public:
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CmdCopyDb() : Command("copydb") { }
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virtual bool adminOnly() {
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return true;
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}
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virtual bool slaveOk() {
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return false;
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}
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virtual bool run(const char *ns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool fromRepl) {
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string fromhost = cmdObj.getStringField("fromhost");
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if ( fromhost.empty() ) {
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/* copy from self */
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stringstream ss;
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ss << "localhost:" << port;
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fromhost = ss.str();
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}
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string fromdb = cmdObj.getStringField("fromdb");
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string todb = cmdObj.getStringField("todb");
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if ( fromhost.empty() || todb.empty() || fromdb.empty() ) {
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errmsg = "parms missing - {copydb: 1, fromhost: <hostname>, fromdb: <db>, todb: <db>}";
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return false;
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}
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setClient(todb.c_str());
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bool res = cloneFrom(fromhost.c_str(), errmsg, fromdb, /*logForReplication=*/!fromRepl, /*slaveok*/false, /*replauth*/false);
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database = 0;
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return res;
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}
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} cmdcopydb;
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} // namespace mongo
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