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// introspect.cpp
/**
* 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/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kDefault
#include "mongo/pch.h"
#include "mongo/bson/util/builder.h"
#include "mongo/db/auth/authorization_manager.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/auth/user_set.h"
#include "mongo/db/curop.h"
#include "mongo/db/catalog/database_holder.h"
#include "mongo/db/introspect.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/storage_options.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/util/goodies.h"
#include "mongo/util/log.h"
namespace mongo {
namespace {
void _appendUserInfo(const CurOp& c,
BSONObjBuilder& builder,
AuthorizationSession* authSession) {
UserNameIterator nameIter = authSession->getAuthenticatedUserNames();
UserName bestUser;
if (nameIter.more())
bestUser = *nameIter;
std::string opdb( nsToDatabase( c.getNS() ) );
BSONArrayBuilder allUsers(builder.subarrayStart("allUsers"));
for ( ; nameIter.more(); nameIter.next()) {
BSONObjBuilder nextUser(allUsers.subobjStart());
nextUser.append(AuthorizationManager::USER_NAME_FIELD_NAME, nameIter->getUser());
nextUser.append(AuthorizationManager::USER_DB_FIELD_NAME, nameIter->getDB());
nextUser.doneFast();
if (nameIter->getDB() == opdb) {
bestUser = *nameIter;
}
}
allUsers.doneFast();
builder.append("user", bestUser.getUser().empty() ? "" : bestUser.getFullName());
}
} // namespace
/**
* @return if collection existed or was created
*/
static bool _profile(OperationContext* txn,
const Client& c,
Database* db,
CurOp& currentOp,
BufBuilder& profileBufBuilder) {
dassert( db );
// build object
BSONObjBuilder b(profileBufBuilder);
currentOp.debug().append(currentOp, b);
b.appendDate("ts", jsTime());
b.append("client", c.clientAddress());
AuthorizationSession * authSession = c.getAuthorizationSession();
_appendUserInfo(currentOp, b, authSession);
BSONObj p = b.done();
WriteUnitOfWork wunit(txn);
// write: not replicated
// get or create the profiling collection
Collection* profileCollection = getOrCreateProfileCollection(txn, db);
if ( !profileCollection ) {
return false;
}
profileCollection->insertDocument( txn, p, false );
wunit.commit();
return true;
}
void profile(OperationContext* txn, const Client& c, int op, CurOp& currentOp) {
bool tryAgain = false;
while ( 1 ) {
try {
// initialize with 1kb to start, to avoid realloc later
// doing this outside the dblock to improve performance
BufBuilder profileBufBuilder(1024);
// NOTE: It's kind of weird that we lock the op's namespace, but have to for now
// since we're sometimes inside the lock already
const string dbname(nsToDatabase(currentOp.getNS()));
scoped_ptr<Lock::DBLock> lk;
// todo: this can be slow, perhaps can re-work
if ( !txn->lockState()->isDbLockedForMode( dbname, MODE_IX ) ) {
lk.reset( new Lock::DBLock( txn->lockState(),
dbname,
tryAgain ? MODE_X : MODE_IX) );
}
Database* db = dbHolder().get(txn, dbname);
if (db != NULL) {
Lock::CollectionLock clk(txn->lockState(), db->getProfilingNS(), MODE_X);
Client::Context cx(txn, currentOp.getNS(), false);
if ( !_profile(txn, c, cx.db(), currentOp, profileBufBuilder ) && lk.get() ) {
if ( tryAgain ) {
// we couldn't profile, but that's ok, we should have logged already
break;
}
// we took an IX lock, so now we try again with an X lock
tryAgain = true;
continue;
}
}
else {
mongo::log() << "note: not profiling because db went away - "
<< "probably a close on: " << currentOp.getNS();
}
return;
}
catch (const AssertionException& assertionEx) {
warning() << "Caught Assertion while trying to profile " << opToString(op)
<< " against " << currentOp.getNS()
<< ": " << assertionEx.toString() << endl;
return;
}
}
}
Collection* getOrCreateProfileCollection(OperationContext* txn,
Database *db,
bool force,
string* errmsg ) {
fassert(16372, db);
const char* profileName = db->getProfilingNS();
Collection* collection = db->getCollection( profileName );
if ( collection ) {
if ( !collection->isCapped() ) {
string myerrmsg = str::stream() << profileName << " exists but isn't capped";
log() << myerrmsg << endl;
if ( errmsg )
*errmsg = myerrmsg;
return NULL;
}
return collection;
}
// does not exist!
if ( force == false && serverGlobalParams.defaultProfile == false ) {
// we don't want it, so why are we here?
static time_t last = time(0) - 10; // warn the first time
if( time(0) > last+10 ) {
log() << "profile: warning ns " << profileName << " does not exist" << endl;
last = time(0);
}
return NULL;
}
if ( !txn->lockState()->isDbLockedForMode( db->name(), MODE_X ) ) {
// can't create here
return NULL;
}
// system.profile namespace doesn't exist; create it
log() << "creating profile collection: " << profileName << endl;
CollectionOptions collectionOptions;
collectionOptions.capped = true;
collectionOptions.cappedSize = 1024 * 1024;
WriteUnitOfWork wunit(txn);
collection = db->createCollection( txn, profileName, collectionOptions );
invariant( collection );
wunit.commit();
return collection;
}
} // namespace mongo
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