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#include "js_stream.h"
#include "async_wrap.h"
#include "env-inl.h"
#include "node_buffer.h"
#include "stream_base-inl.h"
#include "v8.h"
namespace node {
using v8::Array;
using v8::Context;
using v8::FunctionCallbackInfo;
using v8::FunctionTemplate;
using v8::HandleScope;
using v8::Local;
using v8::MaybeLocal;
using v8::Object;
using v8::String;
using v8::Value;
JSStream::JSStream(Environment* env, Local<Object> obj)
: AsyncWrap(env, obj, AsyncWrap::PROVIDER_JSSTREAM),
StreamBase(env) {
node::Wrap(obj, this);
MakeWeak<JSStream>(this);
set_alloc_cb({ OnAllocImpl, this });
set_read_cb({ OnReadImpl, this });
}
JSStream::~JSStream() {
}
void JSStream::OnAllocImpl(size_t size, uv_buf_t* buf, void* ctx) {
buf->base = Malloc(size);
buf->len = size;
}
void JSStream::OnReadImpl(ssize_t nread,
const uv_buf_t* buf,
uv_handle_type pending,
void* ctx) {
JSStream* wrap = static_cast<JSStream*>(ctx);
CHECK_NE(wrap, nullptr);
Environment* env = wrap->env();
HandleScope handle_scope(env->isolate());
Context::Scope context_scope(env->context());
if (nread < 0) {
if (buf != nullptr && buf->base != nullptr)
free(buf->base);
wrap->EmitData(nread, Local<Object>(), Local<Object>());
return;
}
if (nread == 0) {
if (buf->base != nullptr)
free(buf->base);
return;
}
CHECK_LE(static_cast<size_t>(nread), buf->len);
char* base = node::Realloc(buf->base, nread);
CHECK_EQ(pending, UV_UNKNOWN_HANDLE);
Local<Object> obj = Buffer::New(env, base, nread).ToLocalChecked();
wrap->EmitData(nread, obj, Local<Object>());
}
AsyncWrap* JSStream::GetAsyncWrap() {
return static_cast<AsyncWrap*>(this);
}
bool JSStream::IsAlive() {
HandleScope scope(env()->isolate());
Context::Scope context_scope(env()->context());
v8::Local<v8::Value> fn = object()->Get(env()->isalive_string());
if (!fn->IsFunction())
return false;
return MakeCallback(fn.As<v8::Function>(), 0, nullptr)
.ToLocalChecked()->IsTrue();
}
bool JSStream::IsClosing() {
HandleScope scope(env()->isolate());
Context::Scope context_scope(env()->context());
return MakeCallback(env()->isclosing_string(), 0, nullptr)
.ToLocalChecked()->IsTrue();
}
int JSStream::ReadStart() {
HandleScope scope(env()->isolate());
Context::Scope context_scope(env()->context());
return MakeCallback(env()->onreadstart_string(), 0, nullptr)
.ToLocalChecked()->Int32Value();
}
int JSStream::ReadStop() {
HandleScope scope(env()->isolate());
Context::Scope context_scope(env()->context());
return MakeCallback(env()->onreadstop_string(), 0, nullptr)
.ToLocalChecked()->Int32Value();
}
int JSStream::DoShutdown(ShutdownWrap* req_wrap) {
HandleScope scope(env()->isolate());
Context::Scope context_scope(env()->context());
Local<Value> argv[] = {
req_wrap->object()
};
req_wrap->Dispatched();
MaybeLocal<Value> res =
MakeCallback(env()->onshutdown_string(), arraysize(argv), argv);
return res.ToLocalChecked()->Int32Value();
}
int JSStream::DoWrite(WriteWrap* w,
uv_buf_t* bufs,
size_t count,
uv_stream_t* send_handle) {
CHECK_EQ(send_handle, nullptr);
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(i, buf);
}
Local<Value> argv[] = {
w->object(),
bufs_arr
};
w->Dispatched();
MaybeLocal<Value> res =
MakeCallback(env()->onwrite_string(), arraysize(argv), argv);
return res.ToLocalChecked()->Int32Value();
}
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) {
Wrap* w;
CHECK(args[0]->IsObject());
ASSIGN_OR_RETURN_UNWRAP(&w, args[0].As<Object>());
w->Done(args[1]->Int32Value());
}
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]);
do {
uv_buf_t buf;
ssize_t avail = len;
wrap->EmitAlloc(len, &buf);
if (static_cast<ssize_t>(buf.len) < avail)
avail = buf.len;
memcpy(buf.base, data, avail);
data += avail;
len -= avail;
wrap->EmitRead(avail, &buf);
} while (len != 0);
}
void JSStream::EmitEOF(const FunctionCallbackInfo<Value>& args) {
JSStream* wrap;
ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());
wrap->EmitRead(UV_EOF, nullptr);
}
void JSStream::Initialize(Local<Object> target,
Local<Value> unused,
Local<Context> context) {
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);
AsyncWrap::AddWrapMethods(env, t);
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, StreamBase::kFlagHasWritev);
target->Set(jsStreamString, t->GetFunction());
}
} // namespace node
NODE_BUILTIN_MODULE_CONTEXT_AWARE(js_stream, node::JSStream::Initialize)
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