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#include "js_stream.h"
#include "async_wrap.h"
#include "env-inl.h"
#include "node_buffer.h"
#include "node_errors.h"
#include "stream_base-inl.h"
#include "v8.h"
namespace node {
using errors::TryCatchScope;
using v8::Array;
using v8::Context;
using v8::FunctionCallbackInfo;
using v8::FunctionTemplate;
using v8::HandleScope;
using v8::Int32;
using v8::Local;
using v8::Object;
using v8::String;
using v8::Value;
JSStream::JSStream(Environment* env, Local<Object> obj)
: AsyncWrap(env, obj, AsyncWrap::PROVIDER_JSSTREAM),
StreamBase(env) {
MakeWeak();
}
AsyncWrap* JSStream::GetAsyncWrap() {
return static_cast<AsyncWrap*>(this);
}
bool JSStream::IsAlive() {
return true;
}
bool JSStream::IsClosing() {
HandleScope scope(env()->isolate());
Context::Scope context_scope(env()->context());
TryCatchScope try_catch(env());
Local<Value> value;
if (!MakeCallback(env()->isclosing_string(), 0, nullptr).ToLocal(&value)) {
if (!try_catch.HasTerminated())
FatalException(env()->isolate(), try_catch);
return true;
}
return value->IsTrue();
}
int JSStream::ReadStart() {
HandleScope scope(env()->isolate());
Context::Scope context_scope(env()->context());
TryCatchScope try_catch(env());
Local<Value> value;
int value_int = UV_EPROTO;
if (!MakeCallback(env()->onreadstart_string(), 0, nullptr).ToLocal(&value) ||
!value->Int32Value(env()->context()).To(&value_int)) {
if (!try_catch.HasTerminated())
FatalException(env()->isolate(), try_catch);
}
return value_int;
}
int JSStream::ReadStop() {
HandleScope scope(env()->isolate());
Context::Scope context_scope(env()->context());
TryCatchScope try_catch(env());
Local<Value> value;
int value_int = UV_EPROTO;
if (!MakeCallback(env()->onreadstop_string(), 0, nullptr).ToLocal(&value) ||
!value->Int32Value(env()->context()).To(&value_int)) {
if (!try_catch.HasTerminated())
FatalException(env()->isolate(), try_catch);
}
return value_int;
}
int JSStream::DoShutdown(ShutdownWrap* req_wrap) {
HandleScope scope(env()->isolate());
Context::Scope context_scope(env()->context());
Local<Value> argv[] = {
req_wrap->object()
};
TryCatchScope try_catch(env());
Local<Value> value;
int value_int = UV_EPROTO;
if (!MakeCallback(env()->onshutdown_string(),
arraysize(argv),
argv).ToLocal(&value) ||
!value->Int32Value(env()->context()).To(&value_int)) {
if (!try_catch.HasTerminated())
FatalException(env()->isolate(), try_catch);
}
return value_int;
}
int JSStream::DoWrite(WriteWrap* w,
uv_buf_t* bufs,
size_t count,
uv_stream_t* send_handle) {
CHECK_NULL(send_handle);
HandleScope scope(env()->isolate());
Context::Scope context_scope(env()->context());
Local<Array> bufs_arr = Array::New(env()->isolate(), count);
Local<Object> buf;
for (size_t i = 0; i < count; i++) {
buf = Buffer::Copy(env(), bufs[i].base, bufs[i].len).ToLocalChecked();
bufs_arr->Set(env()->context(), i, buf).FromJust();
}
Local<Value> argv[] = {
w->object(),
bufs_arr
};
TryCatchScope try_catch(env());
Local<Value> value;
int value_int = UV_EPROTO;
if (!MakeCallback(env()->onwrite_string(),
arraysize(argv),
argv).ToLocal(&value) ||
!value->Int32Value(env()->context()).To(&value_int)) {
if (!try_catch.HasTerminated())
FatalException(env()->isolate(), try_catch);
}
return value_int;
}
void JSStream::New(const FunctionCallbackInfo<Value>& args) {
// This constructor should not be exposed to public javascript.
// Therefore we assert that we are not trying to call this as a
// normal function.
CHECK(args.IsConstructCall());
Environment* env = Environment::GetCurrent(args);
new JSStream(env, args.This());
}
template <class Wrap>
void JSStream::Finish(const FunctionCallbackInfo<Value>& args) {
CHECK(args[0]->IsObject());
Wrap* w = static_cast<Wrap*>(StreamReq::FromObject(args[0].As<Object>()));
CHECK(args[1]->IsInt32());
w->Done(args[1].As<Int32>()->Value());
}
void JSStream::ReadBuffer(const FunctionCallbackInfo<Value>& args) {
JSStream* wrap;
ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());
CHECK(Buffer::HasInstance(args[0]));
char* data = Buffer::Data(args[0]);
int len = Buffer::Length(args[0]);
// Repeatedly ask the stream's owner for memory, copy the data that we
// just read from JS into those buffers and emit them as reads.
while (len != 0) {
uv_buf_t buf = wrap->EmitAlloc(len);
ssize_t avail = len;
if (static_cast<ssize_t>(buf.len) < avail)
avail = buf.len;
memcpy(buf.base, data, avail);
data += avail;
len -= avail;
wrap->EmitRead(avail, buf);
}
}
void JSStream::EmitEOF(const FunctionCallbackInfo<Value>& args) {
JSStream* wrap;
ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());
wrap->EmitRead(UV_EOF);
}
void JSStream::Initialize(Local<Object> target,
Local<Value> unused,
Local<Context> context,
void* priv) {
Environment* env = Environment::GetCurrent(context);
Local<FunctionTemplate> t = env->NewFunctionTemplate(New);
Local<String> jsStreamString =
FIXED_ONE_BYTE_STRING(env->isolate(), "JSStream");
t->SetClassName(jsStreamString);
t->InstanceTemplate()->SetInternalFieldCount(1);
t->Inherit(AsyncWrap::GetConstructorTemplate(env));
env->SetProtoMethod(t, "finishWrite", Finish<WriteWrap>);
env->SetProtoMethod(t, "finishShutdown", Finish<ShutdownWrap>);
env->SetProtoMethod(t, "readBuffer", ReadBuffer);
env->SetProtoMethod(t, "emitEOF", EmitEOF);
StreamBase::AddMethods<JSStream>(env, t);
target->Set(env->context(),
jsStreamString,
t->GetFunction(context).ToLocalChecked()).FromJust();
}
} // namespace node
NODE_MODULE_CONTEXT_AWARE_INTERNAL(js_stream, node::JSStream::Initialize)
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