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// cloner.cpp - copy a database (export/import basically)
/**
* Copyright (C) 2008 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "stdafx.h"
#include "pdfile.h"
#include "dbclient.h"
#include "../util/builder.h"
#include "jsobj.h"
#include "query.h"
#include "commands.h"
#include "db.h"
extern int port;
bool userCreateNS(const char *ns, JSObj& j, string& err);
class Cloner: boost::noncopyable {
DBClientConnection conn;
void copy(const char *from_ns, const char *to_ns, bool isindex = false);
public:
Cloner() { }
bool go(const char *masterHost, string& errmsg, const string& fromdb);
};
/* for index info object:
{ "name" : "name_1" , "ns" : "foo.index3" , "key" : { "name" : 1.0 } }
we need to fix up the value in the "ns" parameter.
*/
JSObj fixindex(JSObj o) {
JSObjBuilder b;
JSElemIter i(o);
while( i.more() ) {
Element e = i.next();
if( e.eoo() )
break;
if( string("ns") == e.fieldName() ) {
uassert("bad ns field for index during dbcopy", e.type() == String);
const char *p = strchr(e.valuestr(), '.');
uassert("bad ns field for index during dbcopy [2]", p);
string newname = client->name + p;
b.append("ns", newname);
}
else
b.append(e);
}
JSObj res= b.doneAndDecouple();
/* if( mod ) {
cout << "before: " << o.toString() << endl;
o.dump();
cout << "after: " << res.toString() << endl;
res.dump();
}*/
return res;
}
void Cloner::copy(const char *from_collection, const char *to_collection, bool isindex) {
auto_ptr<DBClientCursor> c;
{
dbtemprelease r;
c = auto_ptr<DBClientCursor>( conn.query(from_collection, emptyObj) );
}
assert( c.get() );
while( 1 ) {
{
dbtemprelease r;
if( !c->more() )
break;
}
JSObj tmp = c->next();
/* assure object is valid. note this will slow us down a good bit.
(a validate() instead of toString would be slightly faster)
*/
try {
tmp.toString();
}
catch(...) {
cout << "skipping bad object from " << from_collection << '\n';
continue;
}
JSObj js = tmp;
if( isindex )
js = fixindex(tmp);
theDataFileMgr.insert(to_collection, (void*) js.objdata(), js.objsize());
}
}
bool Cloner::go(const char *masterHost, string& errmsg, const string& fromdb) {
string todb = client->name;
stringstream a,b;
a << "localhost:" << port;
b << "127.0.0.1:" << port;
if( a.str() == masterHost || b.str() == masterHost ) {
if( fromdb == todb ) {
// guard against an "infinite" loop
/* if you are replicating, the local.sources config may be wrong if you get this */
errmsg = "can't clone from self (localhost).";
return false;
}
}
/* todo: we can put thesee releases inside dbclient or a dbclient specialization.
or just wait until we get rid of global lcok anyway.
*/
string ns = fromdb + ".system.namespaces";
auto_ptr<DBClientCursor> c;
{
dbtemprelease r;
if( !conn.connect(masterHost, errmsg) )
return false;
c = auto_ptr<DBClientCursor>( conn.query(ns.c_str(), emptyObj) );
}
if( c.get() == 0 ) {
errmsg = "query failed " + ns;
return false;
}
while( 1 ) {
{
dbtemprelease r;
if( !c->more() )
break;
}
JSObj collection = c->next();
Element e = collection.findElement("name");
assert( !e.eoo() );
assert( e.type() == String );
const char *from_name = e.valuestr();
if( strstr(from_name, ".system.") || strchr(from_name, '$') ) {
continue;
}
JSObj options = collection.getObjectField("options");
/* change name "<fromdb>.collection" -> <todb>.collection */
const char *p = strchr(from_name, '.');
assert(p);
string to_name = todb + p;
//if( !options.isEmpty() )
{
string err;
userCreateNS(to_name.c_str(), options, err);
}
copy(from_name, to_name.c_str());
}
// now build the indexes
string system_indexes_from = fromdb + ".system.indexes";
string system_indexes_to = todb + ".system.indexes";
copy(system_indexes_from.c_str(), system_indexes_to.c_str(), true);
return true;
}
bool cloneFrom(const char *masterHost, string& errmsg, const string& fromdb)
{
Cloner c;
return c.go(masterHost, errmsg, fromdb);
}
/* Usage:
mydb.$cmd.findOne( { clone: "fromhost" } );
*/
class CmdClone : public Command {
public:
CmdClone() : Command("clone") { }
virtual bool run(const char *ns, JSObj& cmdObj, string& errmsg, JSObjBuilder& result) {
string from = cmdObj.getStringField("clone");
if( from.empty() )
return false;
return cloneFrom(from.c_str(), errmsg, client->name);
}
} cmdclone;
/* Usage:
admindb.$cmd.findOne( { copydb: 1, fromhost: <hostname>, fromdb: <db>, todb: <db> } );
*/
class CmdCopyDb : public Command {
public:
CmdCopyDb() : Command("copydb") { }
virtual bool adminOnly() { return true; }
virtual bool run(const char *ns, JSObj& cmdObj, string& errmsg, JSObjBuilder& result) {
string fromhost = cmdObj.getStringField("fromhost");
if( fromhost.empty() ) {
/* copy from self */
stringstream ss;
ss << "localhost:" << port;
fromhost = ss.str();
}
string fromdb = cmdObj.getStringField("fromdb");
string todb = cmdObj.getStringField("todb");
if( fromhost.empty() || todb.empty() || fromdb.empty() ) {
errmsg = "parms missing - {copydb: 1, fromhost: <hostname>, fromdb: <db>, todb: <db>}";
return false;
}
setClient(todb.c_str());
bool res = cloneFrom(fromhost.c_str(), errmsg, fromdb);
client = 0;
return res;
}
} cmdcopydb;
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