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node_stream_loader.cc
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node_stream_loader.cc
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// Copyright (c) 2019 GitHub, Inc.
// Use of this source code is governed by the MIT license that can be
// found in the LICENSE file.
#include "shell/browser/net/node_stream_loader.h"
#include <utility>
#include "mojo/public/cpp/system/string_data_source.h"
#include "shell/common/gin_converters/callback_converter.h"
#include "shell/common/node_includes.h"
namespace electron {
NodeStreamLoader::NodeStreamLoader(
network::mojom::URLResponseHeadPtr head,
mojo::PendingReceiver<network::mojom::URLLoader> loader,
mojo::PendingRemote<network::mojom::URLLoaderClient> client,
v8::Isolate* isolate,
v8::Local<v8::Object> emitter)
: url_loader_(this, std::move(loader)),
client_(std::move(client)),
isolate_(isolate),
emitter_(isolate, emitter) {
url_loader_.set_disconnect_handler(
base::BindOnce(&NodeStreamLoader::NotifyComplete,
weak_factory_.GetWeakPtr(), net::ERR_FAILED));
Start(std::move(head));
}
NodeStreamLoader::~NodeStreamLoader() {
v8::Isolate::Scope isolate_scope(isolate_);
v8::HandleScope handle_scope(isolate_);
// Unsubscribe all handlers.
for (const auto& it : handlers_) {
v8::Local<v8::Value> args[] = {gin::StringToV8(isolate_, it.first),
it.second.Get(isolate_)};
node::MakeCallback(isolate_, emitter_.Get(isolate_), "removeListener",
node::arraysize(args), args, {0, 0});
}
// Destroy the stream if not already ended
if (!ended_) {
node::MakeCallback(isolate_, emitter_.Get(isolate_), "destroy", 0, nullptr,
{0, 0});
}
}
void NodeStreamLoader::Start(network::mojom::URLResponseHeadPtr head) {
mojo::ScopedDataPipeProducerHandle producer;
mojo::ScopedDataPipeConsumerHandle consumer;
MojoResult rv = mojo::CreateDataPipe(nullptr, producer, consumer);
if (rv != MOJO_RESULT_OK) {
NotifyComplete(net::ERR_INSUFFICIENT_RESOURCES);
return;
}
producer_ = std::make_unique<mojo::DataPipeProducer>(std::move(producer));
client_->OnReceiveResponse(std::move(head),
mojo::ScopedDataPipeConsumerHandle());
client_->OnStartLoadingResponseBody(std::move(consumer));
auto weak = weak_factory_.GetWeakPtr();
On("end",
base::BindRepeating(&NodeStreamLoader::NotifyComplete, weak, net::OK));
On("error", base::BindRepeating(&NodeStreamLoader::NotifyComplete, weak,
net::ERR_FAILED));
On("readable", base::BindRepeating(&NodeStreamLoader::NotifyReadable, weak));
}
void NodeStreamLoader::NotifyReadable() {
if (!readable_)
ReadMore();
else if (is_reading_)
has_read_waiting_ = true;
readable_ = true;
}
void NodeStreamLoader::NotifyComplete(int result) {
// Wait until write finishes or fails.
if (is_reading_ || is_writing_) {
ended_ = true;
result_ = result;
return;
}
client_->OnComplete(network::URLLoaderCompletionStatus(result));
delete this;
}
void NodeStreamLoader::ReadMore() {
if (is_reading_) {
// Calling read() can trigger the "readable" event again, making this
// function re-entrant. If we're already reading, we don't want to start
// a nested read, so short-circuit.
return;
}
is_reading_ = true;
auto weak = weak_factory_.GetWeakPtr();
v8::HandleScope scope(isolate_);
// buffer = emitter.read()
v8::MaybeLocal<v8::Value> ret = node::MakeCallback(
isolate_, emitter_.Get(isolate_), "read", 0, nullptr, {0, 0});
DCHECK(weak) << "We shouldn't have been destroyed when calling read()";
// If there is no buffer read, wait until |readable| is emitted again.
v8::Local<v8::Value> buffer;
if (!ret.ToLocal(&buffer) || !node::Buffer::HasInstance(buffer)) {
is_reading_ = false;
// If 'readable' was called after 'read()', try again
if (has_read_waiting_) {
has_read_waiting_ = false;
ReadMore();
return;
}
readable_ = false;
if (ended_) {
NotifyComplete(result_);
}
return;
}
// Hold the buffer until the write is done.
buffer_.Reset(isolate_, buffer);
// Write buffer to mojo pipe asynchronously.
is_reading_ = false;
is_writing_ = true;
producer_->Write(std::make_unique<mojo::StringDataSource>(
base::StringPiece(node::Buffer::Data(buffer),
node::Buffer::Length(buffer)),
mojo::StringDataSource::AsyncWritingMode::
STRING_STAYS_VALID_UNTIL_COMPLETION),
base::BindOnce(&NodeStreamLoader::DidWrite, weak));
}
void NodeStreamLoader::DidWrite(MojoResult result) {
is_writing_ = false;
// We were told to end streaming.
if (ended_) {
NotifyComplete(result_);
return;
}
if (result == MOJO_RESULT_OK && readable_)
ReadMore();
else
NotifyComplete(net::ERR_FAILED);
}
void NodeStreamLoader::On(const char* event, EventCallback callback) {
v8::Isolate::Scope isolate_scope(isolate_);
v8::HandleScope handle_scope(isolate_);
// emitter.on(event, callback)
v8::Local<v8::Value> args[] = {
gin::StringToV8(isolate_, event),
gin_helper::CallbackToV8Leaked(isolate_, std::move(callback)),
};
handlers_[event].Reset(isolate_, args[1]);
node::MakeCallback(isolate_, emitter_.Get(isolate_), "on",
node::arraysize(args), args, {0, 0});
// No more code below, as this class may destruct when subscribing.
}
} // namespace electron