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// v8_db.h
/* 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.
*/
#pragma once
#include <v8.h>
#include <cstring>
#include <cstdio>
#include <cstdlib>
#include "engine.h"
#include "../client/dbclient.h"
namespace mongo {
// These functions may depend on the caller creating a handle scope and context scope.
v8::Handle<v8::FunctionTemplate> getMongoFunctionTemplate( bool local );
void installDBTypes( v8::Handle<v8::ObjectTemplate>& global );
void installDBTypes( v8::Handle<v8::Object>& global );
// the actual globals
mongo::DBClientBase * getConnection( const v8::Arguments& args );
// Mongo members
v8::Handle<v8::Value> mongoConsLocal(const v8::Arguments& args);
v8::Handle<v8::Value> mongoConsExternal(const v8::Arguments& args);
v8::Handle<v8::Value> mongoFind(const v8::Arguments& args);
v8::Handle<v8::Value> mongoInsert(const v8::Arguments& args);
v8::Handle<v8::Value> mongoRemove(const v8::Arguments& args);
v8::Handle<v8::Value> mongoUpdate(const v8::Arguments& args);
v8::Handle<v8::Value> internalCursorCons(const v8::Arguments& args);
v8::Handle<v8::Value> internalCursorNext(const v8::Arguments& args);
v8::Handle<v8::Value> internalCursorHasNext(const v8::Arguments& args);
v8::Handle<v8::Value> internalCursorObjsLeftInBatch(const v8::Arguments& args);
// DB members
v8::Handle<v8::Value> dbInit(const v8::Arguments& args);
v8::Handle<v8::Value> collectionInit( const v8::Arguments& args );
v8::Handle<v8::Value> objectIdInit( const v8::Arguments& args );
v8::Handle<v8::Value> dbRefInit( const v8::Arguments& args );
v8::Handle<v8::Value> dbPointerInit( const v8::Arguments& args );
v8::Handle<v8::Value> dbTimestampInit( const v8::Arguments& args );
v8::Handle<v8::Value> binDataInit( const v8::Arguments& args );
v8::Handle<v8::Value> binDataToString( const v8::Arguments& args );
v8::Handle<v8::Value> numberLongInit( const v8::Arguments& args );
v8::Handle<v8::Value> numberLongToNumber(const v8::Arguments& args);
v8::Handle<v8::Value> numberLongValueOf(const v8::Arguments& args);
v8::Handle<v8::Value> numberLongToString(const v8::Arguments& args);
v8::Handle<v8::Value> dbQueryInit( const v8::Arguments& args );
v8::Handle<v8::Value> dbQueryIndexAccess( uint32_t index , const v8::AccessorInfo& info );
v8::Handle<v8::Value> collectionFallback( v8::Local<v8::String> name, const v8::AccessorInfo &info);
v8::Handle<v8::Value> bsonsize( const v8::Arguments& args );
// call with v8 mutex:
void enableV8Interrupt();
void disableV8Interrupt();
// The implementation below assumes that SERVER-1816 has been fixed - in
// particular, interrupted() must return true if an interrupt was ever
// sent; currently that is not the case if a new killop overwrites the data
// for an old one
template < v8::Handle< v8::Value > ( *f ) ( const v8::Arguments& ) >
v8::Handle< v8::Value > v8Callback( const v8::Arguments &args ) {
disableV8Interrupt(); // we don't want to have to audit all v8 calls for termination exceptions, so we don't allow these exceptions during the callback
if ( globalScriptEngine->interrupted() ) {
v8::V8::TerminateExecution(); // experimentally it seems that TerminateExecution() will override the return value
return v8::Undefined();
}
v8::Handle< v8::Value > ret;
string exception;
try {
ret = f( args );
}
catch( const std::exception &e ) {
exception = e.what();
}
catch( ... ) {
exception = "unknown exception";
}
enableV8Interrupt();
if ( globalScriptEngine->interrupted() ) {
v8::V8::TerminateExecution();
return v8::Undefined();
}
if ( !exception.empty() ) {
// technically, ThrowException is supposed to be the last v8 call before returning
ret = v8::ThrowException( v8::String::New( exception.c_str() ) );
}
return ret;
}
template < v8::Handle< v8::Value > ( *f ) ( const v8::Arguments& ) >
v8::Local< v8::FunctionTemplate > newV8Function() {
return v8::FunctionTemplate::New( v8Callback< f > );
}
// Preemption is going to be allowed for the v8 mutex, and some of our v8
// usage is not preemption safe. So we are using an additional mutex that
// will not be preempted. The V8Lock should be used in place of v8::Locker
// except in certain special cases involving interrupts.
namespace v8Locks {
// the implementations are quite simple - objects must be destroyed in
// reverse of the order created, and should not be shared between threads
struct RecursiveLock {
RecursiveLock();
~RecursiveLock();
bool _unlock;
};
struct RecursiveUnlock {
RecursiveUnlock();
~RecursiveUnlock();
bool _lock;
};
} // namespace v8Locks
class V8Lock {
v8Locks::RecursiveLock _noPreemptionLock;
v8::Locker _preemptionLock;
};
struct V8Unlock {
v8::Unlocker _preemptionUnlock;
v8Locks::RecursiveUnlock _noPreemptionUnlock;
};
}
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