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engine_v8.cpp
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//engine_v8.cpp
/* 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.
*/
#if defined(_WIN32)
/** this is a hack - v8stdint.h defined uint16_t etc. on _WIN32 only, and that collides with
our usage of boost */
#include "boost/cstdint.hpp"
using namespace boost;
#define V8STDINT_H_
#endif
#include "engine_v8.h"
#include "v8_wrapper.h"
#include "v8_utils.h"
#include "v8_db.h"
#define V8_SIMPLE_HEADER V8Lock l; HandleScope handle_scope; Context::Scope context_scope( _context );
namespace mongo {
// guarded by v8 mutex
map< unsigned, int > __interruptSpecToThreadId;
/**
* Unwraps a BSONObj from the JS wrapper
*/
static BSONObj* unwrapBSONObj(const Handle<v8::Object>& obj) {
Handle<External> field = Handle<External>::Cast(obj->GetInternalField(0));
if (field.IsEmpty() || !field->IsExternal())
return 0;
void* ptr = field->Value();
return (BSONObj*)ptr;
}
static void weakRefBSONCallback(v8::Persistent<v8::Value> p, void* scope) {
// should we lock here? no idea, and no doc from v8 of course
HandleScope handle_scope;
if (!p.IsNearDeath())
return;
Handle<External> field = Handle<External>::Cast(p->ToObject()->GetInternalField(0));
BSONObj* data = (BSONObj*) field->Value();
delete data;
p.Dispose();
}
Persistent<v8::Object> V8Scope::wrapBSONObject(Local<v8::Object> obj, BSONObj* data) {
obj->SetInternalField(0, v8::External::New(data));
Persistent<v8::Object> p = Persistent<v8::Object>::New(obj);
p.MakeWeak(this, weakRefBSONCallback);
return p;
}
static void weakRefArrayCallback(v8::Persistent<v8::Value> p, void* scope) {
// should we lock here? no idea, and no doc from v8 of course
HandleScope handle_scope;
if (!p.IsNearDeath())
return;
Handle<External> field = Handle<External>::Cast(p->ToObject()->GetInternalField(0));
char* data = (char*) field->Value();
delete [] data;
p.Dispose();
}
Persistent<v8::Object> V8Scope::wrapArrayObject(Local<v8::Object> obj, char* data) {
obj->SetInternalField(0, v8::External::New(data));
Persistent<v8::Object> p = Persistent<v8::Object>::New(obj);
p.MakeWeak(this, weakRefArrayCallback);
return p;
}
static Handle<v8::Value> namedGet(Local<v8::String> name, const v8::AccessorInfo &info) {
// all properties should be set, otherwise means builtin or deleted
if (!(info.This()->HasRealNamedProperty(name)))
return v8::Handle<v8::Value>();
Handle<v8::Value> val = info.This()->GetRealNamedProperty(name);
if (!val->IsUndefined()) {
// value already cached
return val;
}
string key = toSTLString(name);
BSONObj *obj = unwrapBSONObj(info.Holder());
BSONElement elmt = obj->getField(key.c_str());
if (elmt.eoo())
return Handle<Value>();
Local< External > scp = External::Cast( *info.Data() );
V8Scope* scope = (V8Scope*)(scp->Value());
val = scope->mongoToV8Element(elmt, false);
info.This()->ForceSet(name, val);
if (elmt.type() == mongo::Object || elmt.type() == mongo::Array) {
// if accessing a subobject, it may get modified and base obj would not know
// have to set base as modified, which means some optim is lost
info.This()->SetHiddenValue(scope->V8STR_MODIFIED, v8::Boolean::New(true));
}
return val;
}
static Handle<v8::Value> namedGetRO(Local<v8::String> name, const v8::AccessorInfo &info) {
string key = toSTLString(name);
BSONObj *obj = unwrapBSONObj(info.Holder());
BSONElement elmt = obj->getField(key.c_str());
if (elmt.eoo())
return Handle<Value>();
Local< External > scp = External::Cast( *info.Data() );
V8Scope* scope = (V8Scope*)(scp->Value());
Handle<v8::Value> val = scope->mongoToV8Element(elmt, true);
return val;
}
static Handle<v8::Value> namedSet(Local<v8::String> name, Local<v8::Value> value_obj, const v8::AccessorInfo& info) {
Local< External > scp = External::Cast( *info.Data() );
V8Scope* scope = (V8Scope*)(scp->Value());
info.This()->SetHiddenValue(scope->V8STR_MODIFIED, v8::Boolean::New(true));
return Handle<Value>();
}
static Handle<v8::Array> namedEnumerator(const AccessorInfo &info) {
BSONObj *obj = unwrapBSONObj(info.Holder());
Handle<v8::Array> arr = Handle<v8::Array>(v8::Array::New(obj->nFields()));
int i = 0;
Local< External > scp = External::Cast( *info.Data() );
V8Scope* scope = (V8Scope*)(scp->Value());
// note here that if keys are parseable number, v8 will access them using index
for ( BSONObjIterator it(*obj); it.more(); ++i) {
const BSONElement& f = it.next();
// arr->Set(i, v8::String::NewExternal(new ExternalString(f.fieldName())));
Handle<v8::String> name = scope->getV8Str(f.fieldName());
arr->Set(i, name);
}
return arr;
}
Handle<Boolean> namedDelete( Local<v8::String> property, const AccessorInfo& info ) {
Local< External > scp = External::Cast( *info.Data() );
V8Scope* scope = (V8Scope*)(scp->Value());
info.This()->SetHiddenValue(scope->V8STR_MODIFIED, v8::Boolean::New(true));
return Handle<Boolean>();
}
// v8::Handle<v8::Integer> namedQuery(Local<v8::String> property, const AccessorInfo& info) {
// string key = ToString(property);
// return v8::Integer::New(None);
// }
static Handle<v8::Value> indexedGet(uint32_t index, const v8::AccessorInfo &info) {
// all properties should be set, otherwise means builtin or deleted
if (!(info.This()->HasRealIndexedProperty(index)))
return v8::Handle<v8::Value>();
StringBuilder ss;
ss << index;
string key = ss.str();
Local< External > scp = External::Cast( *info.Data() );
V8Scope* scope = (V8Scope*)(scp->Value());
// cannot get v8 to properly cache the indexed val in the js object
// Handle<v8::String> name = scope->getV8Str(key);
// // v8 API really confusing here, must check existence on index, but then fetch with name
// if (info.This()->HasRealIndexedProperty(index)) {
// Handle<v8::Value> val = info.This()->GetRealNamedProperty(name);
// if (!val.IsEmpty() && !val->IsNull())
// return val;
// }
BSONObj *obj = unwrapBSONObj(info.Holder());
BSONElement elmt = obj->getField(key);
if (elmt.eoo())
return Handle<Value>();
Handle<Value> val = scope->mongoToV8Element(elmt, false);
// info.This()->ForceSet(name, val);
if (elmt.type() == mongo::Object || elmt.type() == mongo::Array) {
// if accessing a subobject, it may get modified and base obj would not know
// have to set base as modified, which means some optim is lost
info.This()->SetHiddenValue(scope->V8STR_MODIFIED, v8::Boolean::New(true));
}
return val;
}
Handle<Boolean> indexedDelete( uint32_t index, const AccessorInfo& info ) {
Local< External > scp = External::Cast( *info.Data() );
V8Scope* scope = (V8Scope*)(scp->Value());
info.This()->SetHiddenValue(scope->V8STR_MODIFIED, v8::Boolean::New(true));
return Handle<Boolean>();
}
static Handle<v8::Value> indexedGetRO(uint32_t index, const v8::AccessorInfo &info) {
StringBuilder ss;
ss << index;
string key = ss.str();
Local< External > scp = External::Cast( *info.Data() );
V8Scope* scope = (V8Scope*)(scp->Value());
// cannot get v8 to properly cache the indexed val in the js object
// Handle<v8::String> name = scope->getV8Str(key);
// // v8 API really confusing here, must check existence on index, but then fetch with name
// if (info.This()->HasRealIndexedProperty(index)) {
// Handle<v8::Value> val = info.This()->GetRealNamedProperty(name);
// if (!val.IsEmpty() && !val->IsNull())
// return val;
// }
BSONObj *obj = unwrapBSONObj(info.Holder());
BSONElement elmt = obj->getField(key);
if (elmt.eoo())
return Handle<Value>();
Handle<Value> val = scope->mongoToV8Element(elmt, true);
// info.This()->ForceSet(name, val);
return val;
}
static Handle<v8::Value> indexedSet(uint32_t index, Local<v8::Value> value_obj, const v8::AccessorInfo& info) {
Local< External > scp = External::Cast( *info.Data() );
V8Scope* scope = (V8Scope*)(scp->Value());
info.This()->SetHiddenValue(scope->V8STR_MODIFIED, v8::Boolean::New(true));
return Handle<Value>();
}
// static Handle<v8::Array> indexedEnumerator(const AccessorInfo &info) {
// BSONObj *obj = unwrapBSONObj(info.Holder());
// Handle<v8::Array> arr = Handle<v8::Array>(v8::Array::New(obj->nFields()));
// Local< External > scp = External::Cast( *info.Data() );
// V8Scope* scope = (V8Scope*)(scp->Value());
// int i = 0;
// for ( BSONObjIterator it(*obj); it.more(); ++i) {
// const BSONElement& f = it.next();
//// arr->Set(i, v8::String::NewExternal(new ExternalString(f.fieldName())));
// arr->Set(i, scope->getV8Str(f.fieldName()));
// }
// return arr;
// }
Handle<Value> NamedReadOnlySet( Local<v8::String> property, Local<Value> value, const AccessorInfo& info ) {
string key = toSTLString(property);
cout << "cannot write property " << key << " to read-only object" << endl;
return value;
}
Handle<Boolean> NamedReadOnlyDelete( Local<v8::String> property, const AccessorInfo& info ) {
string key = toSTLString(property);
cout << "cannot delete property " << key << " from read-only object" << endl;
return Boolean::New( false );
}
Handle<Value> IndexedReadOnlySet( uint32_t index, Local<Value> value, const AccessorInfo& info ) {
cout << "cannot write property " << index << " to read-only array" << endl;
return value;
}
Handle<Boolean> IndexedReadOnlyDelete( uint32_t index, const AccessorInfo& info ) {
cout << "cannot delete property " << index << " from read-only array" << endl;
return Boolean::New( false );
}
// --- engine ---
V8ScriptEngine::V8ScriptEngine() {
}
V8ScriptEngine::~V8ScriptEngine() {
}
void ScriptEngine::setup() {
if ( !globalScriptEngine ) {
globalScriptEngine = new V8ScriptEngine();
}
}
void V8ScriptEngine::interrupt( unsigned opSpec ) {
v8::Locker l;
if ( __interruptSpecToThreadId.count( opSpec ) ) {
V8::TerminateExecution( __interruptSpecToThreadId[ opSpec ] );
}
}
void V8ScriptEngine::interruptAll() {
v8::Locker l;
vector< int > toKill; // v8 mutex could potentially be yielded during the termination call
for( map< unsigned, int >::const_iterator i = __interruptSpecToThreadId.begin(); i != __interruptSpecToThreadId.end(); ++i ) {
toKill.push_back( i->second );
}
for( vector< int >::const_iterator i = toKill.begin(); i != toKill.end(); ++i ) {
V8::TerminateExecution( *i );
}
}
// --- scope ---
V8Scope::V8Scope( V8ScriptEngine * engine )
: _engine( engine ) ,
_connectState( NOT ) {
V8Lock l;
HandleScope handleScope;
_context = Context::New();
Context::Scope context_scope( _context );
_global = Persistent< v8::Object >::New( _context->Global() );
_emptyObj = Persistent< v8::Object >::New( v8::Object::New() );
// initialize lazy object template
lzObjectTemplate = Persistent<ObjectTemplate>::New(ObjectTemplate::New());
lzObjectTemplate->SetInternalFieldCount( 1 );
lzObjectTemplate->SetNamedPropertyHandler(namedGet, namedSet, 0, namedDelete, 0, v8::External::New(this));
lzObjectTemplate->SetIndexedPropertyHandler(indexedGet, indexedSet, 0, indexedDelete, 0, v8::External::New(this));
roObjectTemplate = Persistent<ObjectTemplate>::New(ObjectTemplate::New());
roObjectTemplate->SetInternalFieldCount( 1 );
roObjectTemplate->SetNamedPropertyHandler(namedGetRO, NamedReadOnlySet, 0, NamedReadOnlyDelete, namedEnumerator, v8::External::New(this));
roObjectTemplate->SetIndexedPropertyHandler(indexedGetRO, IndexedReadOnlySet, 0, IndexedReadOnlyDelete, 0, v8::External::New(this));
// initialize lazy array template
// unfortunately it is not possible to create true v8 array from a template
// this means we use an object template and copy methods over
// this it creates issues when calling certain methods that check array type
lzArrayTemplate = Persistent<ObjectTemplate>::New(ObjectTemplate::New());
lzArrayTemplate->SetInternalFieldCount( 1 );
lzArrayTemplate->SetIndexedPropertyHandler(indexedGet, 0, 0, 0, 0, v8::External::New(this));
internalFieldObjects = Persistent<ObjectTemplate>::New(ObjectTemplate::New());
internalFieldObjects->SetInternalFieldCount( 1 );
V8STR_CONN = getV8Str( "_conn" );
V8STR_ID = getV8Str( "_id" );
V8STR_LENGTH = getV8Str( "length" );
V8STR_LEN = getV8Str( "len" );
V8STR_TYPE = getV8Str( "type" );
V8STR_ISOBJECTID = getV8Str( "isObjectId" );
V8STR_RETURN = getV8Str( "return" );
V8STR_ARGS = getV8Str( "args" );
V8STR_T = getV8Str( "t" );
V8STR_I = getV8Str( "i" );
V8STR_EMPTY = getV8Str( "" );
V8STR_MINKEY = getV8Str( "$MinKey" );
V8STR_MAXKEY = getV8Str( "$MaxKey" );
V8STR_NUMBERLONG = getV8Str( "__NumberLong" );
V8STR_NUMBERINT = getV8Str( "__NumberInt" );
V8STR_DBPTR = getV8Str( "__DBPointer" );
V8STR_BINDATA = getV8Str( "__BinData" );
V8STR_NATIVE_FUNC = getV8Str( "_native_function" );
V8STR_NATIVE_DATA = getV8Str( "_native_data" );
V8STR_V8_FUNC = getV8Str( "_v8_function" );
V8STR_RO = getV8Str( "_ro" );
V8STR_MODIFIED = getV8Str( "_mod" );
injectV8Function("print", Print);
injectV8Function("version", Version);
injectV8Function("load", load);
_wrapper = Persistent< v8::Function >::New( getObjectWrapperTemplate(this)->GetFunction() );
injectV8Function("gc", GCV8);
installDBTypes( this, _global );
}
V8Scope::~V8Scope() {
V8Lock l;
Context::Scope context_scope( _context );
_wrapper.Dispose();
_emptyObj.Dispose();
for( unsigned i = 0; i < _funcs.size(); ++i )
_funcs[ i ].Dispose();
_funcs.clear();
_global.Dispose();
_context.Dispose();
std::map <string, v8::Persistent <v8::String> >::iterator it = _strCache.begin();
std::map <string, v8::Persistent <v8::String> >::iterator end = _strCache.end();
while (it != end) {
it->second.Dispose();
++it;
}
lzObjectTemplate.Dispose();
lzArrayTemplate.Dispose();
roObjectTemplate.Dispose();
internalFieldObjects.Dispose();
}
/**
* JS Callback that will call a c++ function with BSON arguments.
*/
Handle< Value > V8Scope::nativeCallback( V8Scope* scope, const Arguments &args ) {
V8Lock l;
HandleScope handle_scope;
Local< External > f = External::Cast( *args.Callee()->Get( scope->V8STR_NATIVE_FUNC ) );
NativeFunction function = (NativeFunction)(f->Value());
Local< External > data = External::Cast( *args.Callee()->Get( scope->V8STR_NATIVE_DATA ) );
BSONObjBuilder b;
for( int i = 0; i < args.Length(); ++i ) {
stringstream ss;
ss << i;
scope->v8ToMongoElement( b, scope->V8STR_EMPTY, ss.str(), args[ i ] );
}
BSONObj nativeArgs = b.obj();
BSONObj ret;
try {
ret = function( nativeArgs, data->Value() );
}
catch( const std::exception &e ) {
return v8::ThrowException(v8::String::New(e.what()));
}
catch( ... ) {
return v8::ThrowException(v8::String::New("unknown exception"));
}
return handle_scope.Close( scope->mongoToV8Element( ret.firstElement() ) );
}
Handle< Value > V8Scope::load( V8Scope* scope, const Arguments &args ) {
Context::Scope context_scope(scope->_context);
for (int i = 0; i < args.Length(); ++i) {
std::string filename(toSTLString(args[i]));
if (!scope->execFile(filename, false , true , false)) {
return v8::ThrowException(v8::String::New((std::string("error loading file: ") + filename).c_str()));
}
}
return v8::True();
}
/**
* JS Callback that will call a c++ function with the v8 scope and v8 arguments.
* Handles interrupts, exception handling, etc
*
* 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
*/
v8::Handle< v8::Value > V8Scope::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();
}
Local< External > f = External::Cast( *args.Callee()->Get( v8::String::New( "_v8_function" ) ) );
v8Function function = (v8Function)(f->Value());
Local< External > scp = External::Cast( *args.Data() );
V8Scope* scope = (V8Scope*)(scp->Value());
v8::Handle< v8::Value > ret;
string exception;
try {
ret = function( scope, 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;
}
// ---- global stuff ----
void V8Scope::init( const BSONObj * data ) {
V8Lock l;
if ( ! data )
return;
BSONObjIterator i( *data );
while ( i.more() ) {
BSONElement e = i.next();
setElement( e.fieldName() , e );
}
}
void V8Scope::setNumber( const char * field , double val ) {
V8_SIMPLE_HEADER
_global->Set( getV8Str( field ) , v8::Number::New( val ) );
}
void V8Scope::setString( const char * field , const char * val ) {
V8_SIMPLE_HEADER
_global->Set( getV8Str( field ) , v8::String::New( val ) );
}
void V8Scope::setBoolean( const char * field , bool val ) {
V8_SIMPLE_HEADER
_global->Set( getV8Str( field ) , v8::Boolean::New( val ) );
}
void V8Scope::setElement( const char *field , const BSONElement& e ) {
V8_SIMPLE_HEADER
_global->Set( getV8Str( field ) , mongoToV8Element( e ) );
}
void V8Scope::setObject( const char *field , const BSONObj& obj , bool readOnly) {
V8_SIMPLE_HEADER
// Set() accepts a ReadOnly parameter, but this just prevents the field itself
// from being overwritten and doesn't protect the object stored in 'field'.
_global->Set( getV8Str( field ) , mongoToLZV8( obj, false, readOnly) );
}
int V8Scope::type( const char *field ) {
V8_SIMPLE_HEADER
Handle<Value> v = get( field );
if ( v->IsNull() )
return jstNULL;
if ( v->IsUndefined() )
return Undefined;
if ( v->IsString() )
return String;
if ( v->IsFunction() )
return Code;
if ( v->IsArray() )
return Array;
if ( v->IsBoolean() )
return Bool;
// needs to be explicit NumberInt to use integer
// if ( v->IsInt32() )
// return NumberInt;
if ( v->IsNumber() )
return NumberDouble;
if ( v->IsExternal() ) {
uassert( 10230 , "can't handle external yet" , 0 );
return -1;
}
if ( v->IsDate() )
return Date;
if ( v->IsObject() )
return Object;
throw UserException( 12509, (string)"don't know what this is: " + field );
}
v8::Handle<v8::Value> V8Scope::get( const char * field ) {
return _global->Get( getV8Str( field ) );
}
double V8Scope::getNumber( const char *field ) {
V8_SIMPLE_HEADER
return get( field )->ToNumber()->Value();
}
int V8Scope::getNumberInt( const char *field ) {
V8_SIMPLE_HEADER
return get( field )->ToInt32()->Value();
}
long long V8Scope::getNumberLongLong( const char *field ) {
V8_SIMPLE_HEADER
return get( field )->ToInteger()->Value();
}
string V8Scope::getString( const char *field ) {
V8_SIMPLE_HEADER
return toSTLString( get( field ) );
}
bool V8Scope::getBoolean( const char *field ) {
V8_SIMPLE_HEADER
return get( field )->ToBoolean()->Value();
}
BSONObj V8Scope::getObject( const char * field ) {
V8_SIMPLE_HEADER
Handle<Value> v = get( field );
if ( v->IsNull() || v->IsUndefined() )
return BSONObj();
uassert( 10231 , "not an object" , v->IsObject() );
return v8ToMongo( v->ToObject() );
}
// --- functions -----
bool hasFunctionIdentifier( const string& code ) {
if ( code.size() < 9 || code.find( "function" ) != 0 )
return false;
return code[8] == ' ' || code[8] == '(';
}
Local< v8::Function > V8Scope::__createFunction( const char * raw ) {
raw = jsSkipWhiteSpace( raw );
string code = raw;
if ( !hasFunctionIdentifier( code ) ) {
if ( code.find( "\n" ) == string::npos &&
! hasJSReturn( code ) &&
( code.find( ";" ) == string::npos || code.find( ";" ) == code.size() - 1 ) ) {
code = "return " + code;
}
code = "function(){ " + code + "}";
}
int num = _funcs.size() + 1;
string fn;
{
stringstream ss;
ss << "_funcs" << num;
fn = ss.str();
}
code = fn + " = " + code;
TryCatch try_catch;
// this might be time consuming, consider allowing an interrupt
Handle<Script> script = v8::Script::Compile( v8::String::New( code.c_str() ) ,
v8::String::New( fn.c_str() ) );
if ( script.IsEmpty() ) {
_error = (string)"compile error: " + toSTLString( &try_catch );
log() << _error << endl;
return Local< v8::Function >();
}
Local<Value> result = script->Run();
if ( result.IsEmpty() ) {
_error = (string)"compile error: " + toSTLString( &try_catch );
log() << _error << endl;
return Local< v8::Function >();
}
return v8::Function::Cast( *_global->Get( v8::String::New( fn.c_str() ) ) );
}
ScriptingFunction V8Scope::_createFunction( const char * raw ) {
V8_SIMPLE_HEADER
Local< Value > ret = __createFunction( raw );
if ( ret.IsEmpty() )
return 0;
Persistent<Value> f = Persistent< Value >::New( ret );
uassert( 10232, "not a func" , f->IsFunction() );
int num = _funcs.size() + 1;
_funcs.push_back( f );
return num;
}
void V8Scope::setFunction( const char *field , const char * code ) {
V8_SIMPLE_HEADER
_global->Set( getV8Str( field ) , __createFunction(code) );
}
// void V8Scope::setThis( const BSONObj * obj ) {
// V8_SIMPLE_HEADER
// if ( ! obj ) {
// _this = Persistent< v8::Object >::New( v8::Object::New() );
// return;
// }
//
// //_this = mongoToV8( *obj );
// v8::Handle<v8::Value> argv[1];
// argv[0] = v8::External::New( createWrapperHolder( this, obj , true , false ) );
// _this = Persistent< v8::Object >::New( _wrapper->NewInstance( 1, argv ) );
// }
void V8Scope::rename( const char * from , const char * to ) {
V8_SIMPLE_HEADER;
Handle<v8::String> f = getV8Str( from );
Handle<v8::String> t = getV8Str( to );
_global->Set( t , _global->Get( f ) );
_global->Set( f , v8::Undefined() );
}
int V8Scope::invoke( ScriptingFunction func , const BSONObj* argsObject, const BSONObj* recv, int timeoutMs , bool ignoreReturn, bool readOnlyArgs, bool readOnlyRecv ) {
V8_SIMPLE_HEADER
Handle<Value> funcValue = _funcs[func-1];
TryCatch try_catch;
int nargs = argsObject ? argsObject->nFields() : 0;
scoped_array< Handle<Value> > args;
if ( nargs ) {
args.reset( new Handle<Value>[nargs] );
BSONObjIterator it( *argsObject );
for ( int i=0; i<nargs; i++ ) {
BSONElement next = it.next();
args[i] = mongoToV8Element( next, readOnlyArgs );
}
setObject( "args", *argsObject, readOnlyArgs); // for backwards compatibility
}
else {
_global->Set( V8STR_ARGS, v8::Undefined() );
}
if ( globalScriptEngine->interrupted() ) {
stringstream ss;
ss << "error in invoke: " << globalScriptEngine->checkInterrupt();
_error = ss.str();
log() << _error << endl;
return 1;
}
Handle<v8::Object> v8recv;
if (recv != 0)
v8recv = mongoToLZV8(*recv, false, readOnlyRecv);
else
v8recv = _emptyObj;
enableV8Interrupt(); // because of v8 locker we can check interrupted, then enable
Local<Value> result = ((v8::Function*)(*funcValue))->Call( v8recv , nargs , nargs ? args.get() : 0 );
disableV8Interrupt();
if ( result.IsEmpty() ) {
stringstream ss;
if ( try_catch.HasCaught() && !try_catch.CanContinue() ) {
ss << "error in invoke: " << globalScriptEngine->checkInterrupt();
}
else {
ss << "error in invoke: " << toSTLString( &try_catch );
}
_error = ss.str();
log() << _error << endl;
return 1;
}
if ( ! ignoreReturn ) {
_global->Set( V8STR_RETURN , result );
}
return 0;
}
bool V8Scope::exec( const StringData& code , const string& name , bool printResult , bool reportError , bool assertOnError, int timeoutMs ) {
if ( timeoutMs ) {
static bool t = 1;
if ( t ) {
log() << "timeoutMs not support for v8 yet code: " << code << endl;
t = 0;
}
}
V8_SIMPLE_HEADER
TryCatch try_catch;
Handle<Script> script = v8::Script::Compile( v8::String::New( code.data() ) ,
v8::String::New( name.c_str() ) );
if (script.IsEmpty()) {
stringstream ss;
ss << "compile error: " << toSTLString( &try_catch );
_error = ss.str();
if (reportError)
log() << _error << endl;
if ( assertOnError )
uassert( 10233 , _error , 0 );
return false;
}
if ( globalScriptEngine->interrupted() ) {
_error = (string)"exec error: " + globalScriptEngine->checkInterrupt();
if ( reportError ) {
log() << _error << endl;
}
if ( assertOnError ) {
uassert( 13475 , _error , 0 );
}
return false;
}
enableV8Interrupt(); // because of v8 locker we can check interrupted, then enable
Handle<v8::Value> result = script->Run();
disableV8Interrupt();
if ( result.IsEmpty() ) {
if ( try_catch.HasCaught() && !try_catch.CanContinue() ) {
_error = (string)"exec error: " + globalScriptEngine->checkInterrupt();
}
else {
_error = (string)"exec error: " + toSTLString( &try_catch );
}
if ( reportError )
log() << _error << endl;
if ( assertOnError )
uassert( 10234 , _error , 0 );
return false;
}
_global->Set( getV8Str( "__lastres__" ) , result );
if ( printResult && ! result->IsUndefined() ) {
cout << toSTLString( result ) << endl;
}
return true;
}
void V8Scope::injectNative( const char *field, NativeFunction func, void* data ) {
injectNative(field, func, _global, data);
}
void V8Scope::injectNative( const char *field, NativeFunction func, Handle<v8::Object>& obj, void* data ) {
V8_SIMPLE_HEADER
Handle< FunctionTemplate > ft = createV8Function(nativeCallback);
ft->Set( this->V8STR_NATIVE_FUNC, External::New( (void*)func ) );
ft->Set( this->V8STR_NATIVE_DATA, External::New( data ) );
obj->Set( getV8Str( field ), ft->GetFunction() );
}
void V8Scope::injectV8Function( const char *field, v8Function func ) {
injectV8Function(field, func, _global);
}
void V8Scope::injectV8Function( const char *field, v8Function func, Handle<v8::Object>& obj ) {
V8_SIMPLE_HEADER
Handle< FunctionTemplate > ft = createV8Function(func);
Handle<v8::Function> f = ft->GetFunction();
obj->Set( getV8Str( field ), f );
}
void V8Scope::injectV8Function( const char *field, v8Function func, Handle<v8::Template>& t ) {
V8_SIMPLE_HEADER
Handle< FunctionTemplate > ft = createV8Function(func);
Handle<v8::Function> f = ft->GetFunction();
t->Set( getV8Str( field ), f );
}
Handle<FunctionTemplate> V8Scope::createV8Function( v8Function func ) {
Handle< FunctionTemplate > ft = v8::FunctionTemplate::New(v8Callback, External::New( this ));
ft->Set( this->V8STR_V8_FUNC, External::New( (void*)func ) );
return ft;
}
void V8Scope::gc() {
cout << "in gc" << endl;
V8Lock l;
while( !V8::IdleNotification() );
}
// ----- db access -----
void V8Scope::localConnect( const char * dbName ) {
{
V8_SIMPLE_HEADER
if ( _connectState == EXTERNAL )
throw UserException( 12510, "externalSetup already called, can't call externalSetup" );
if ( _connectState == LOCAL ) {
if ( _localDBName == dbName )
return;
throw UserException( 12511, "localConnect called with a different name previously" );
}
// needed for killop / interrupt support
v8::Locker::StartPreemption( 50 );
//_global->Set( v8::String::New( "Mongo" ) , _engine->_externalTemplate->GetFunction() );
_global->Set( getV8Str( "Mongo" ) , getMongoFunctionTemplate( this, true )->GetFunction() );
execCoreFiles();
exec( "_mongo = new Mongo();" , "local connect 2" , false , true , true , 0 );
exec( (string)"db = _mongo.getDB(\"" + dbName + "\");" , "local connect 3" , false , true , true , 0 );
_connectState = LOCAL;
_localDBName = dbName;
}
loadStored();
}
void V8Scope::externalSetup() {
V8_SIMPLE_HEADER
if ( _connectState == EXTERNAL )
return;
if ( _connectState == LOCAL )
throw UserException( 12512, "localConnect already called, can't call externalSetup" );
installFork( this, _global, _context );
_global->Set( getV8Str( "Mongo" ) , getMongoFunctionTemplate( this, false )->GetFunction() );
execCoreFiles();
_connectState = EXTERNAL;
}
// ----- internal -----
void V8Scope::reset() {
_startCall();
}
void V8Scope::_startCall() {
_error = "";
}
Local< v8::Value > newFunction( const char *code ) {
stringstream codeSS;
codeSS << "____MontoToV8_newFunction_temp = " << code;
string codeStr = codeSS.str();
Local< Script > compiled = Script::New( v8::String::New( codeStr.c_str() ) );
Local< Value > ret = compiled->Run();
return ret;
}
Local< v8::Value > V8Scope::newId( const OID &id ) {
v8::Function * idCons = this->getObjectIdCons();
v8::Handle<v8::Value> argv[1];
argv[0] = v8::String::New( id.str().c_str() );
return idCons->NewInstance( 1 , argv );
}
Local<v8::Object> V8Scope::mongoToV8( const BSONObj& m , bool array, bool readOnly ) {
Local<v8::Object> o;
// handle DBRef. needs to come first. isn't it? (metagoto)
static string ref = "$ref";
if ( ref == m.firstElement().fieldName() ) {
const BSONElement& id = m["$id"];
if (!id.eoo()) { // there's no check on $id exitence in sm implementation. risky ?
v8::Function* dbRef = getNamedCons( "DBRef" );
o = dbRef->NewInstance();
}
}
Local< v8::ObjectTemplate > readOnlyObjects;
if ( !o.IsEmpty() ) {
readOnly = false;
}
else if ( array ) {
// NOTE Looks like it's impossible to add interceptors to v8 arrays.
readOnly = false;
o = v8::Array::New();
}
else if ( !readOnly ) {
o = v8::Object::New();
}
else {
// NOTE Our readOnly implemention relies on undocumented ObjectTemplate
// functionality that may be fragile, but it still seems like the best option
// for now -- fwiw, the v8 docs are pretty sparse. I've determined experimentally
// that when property handlers are set for an object template, they will attach
// to objects previously created by that template. To get this to work, though,
// it is necessary to initialize the template's property handlers before
// creating objects from the template (as I have in the following few lines
// of code).
// NOTE In my first attempt, I configured the permanent property handlers before
// constructiong the object and replaced the Set() calls below with ForceSet().
// However, it turns out that ForceSet() only bypasses handlers for named
// properties and not for indexed properties.
readOnlyObjects = v8::ObjectTemplate::New();
// NOTE This internal field will store type info for special db types. For
// regular objects the field is unnecessary - for simplicity I'm creating just
// one readOnlyObjects template for objects where the field is & isn't necessary,
// assuming that the overhead of an internal field is slight.
readOnlyObjects->SetInternalFieldCount( 1 );
readOnlyObjects->SetNamedPropertyHandler( 0 );
readOnlyObjects->SetIndexedPropertyHandler( 0 );
o = readOnlyObjects->NewInstance();
}
mongo::BSONObj sub;
for ( BSONObjIterator i(m); i.more(); ) {
const BSONElement& f = i.next();
Local<Value> v;
Handle<v8::String> name = getV8Str(f.fieldName());
switch ( f.type() ) {
case mongo::Code:
o->Set( name, newFunction( f.valuestr() ) );
break;
case CodeWScope:
if ( f.codeWScopeObject().isEmpty() )
log() << "warning: CodeWScope doesn't transfer to db.eval" << endl;
o->Set( name, newFunction( f.codeWScopeCode() ) );
break;
case mongo::String:
o->Set( name , v8::String::New( f.valuestr() ) );
break;
case mongo::jstOID: {
v8::Function * idCons = getObjectIdCons();
v8::Handle<v8::Value> argv[1];
argv[0] = v8::String::New( f.__oid().str().c_str() );
o->Set( name ,
idCons->NewInstance( 1 , argv ) );
break;
}
case mongo::NumberDouble:
case mongo::NumberInt:
o->Set( name , v8::Number::New( f.number() ) );
break;
// case mongo::NumberInt: {
// Local<v8::Object> sub = readOnly ? readOnlyObjects->NewInstance() : internalFieldObjects->NewInstance();
// int val = f.numberInt();
// v8::Function* numberInt = getNamedCons( "NumberInt" );
// v8::Handle<v8::Value> argv[1];
// argv[0] = v8::Int32::New( val );
// o->Set( name, numberInt->NewInstance( 1, argv ) );
// break;