electron/atom/browser/net/resolve_proxy_helper.cc

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// Copyright (c) 2018 GitHub, Inc.
// Use of this source code is governed by the MIT license that can be
// found in the LICENSE file.
#include "atom/browser/net/resolve_proxy_helper.h"
#include "atom/browser/atom_browser_context.h"
#include "base/bind.h"
#include "base/threading/thread_task_runner_handle.h"
#include "net/url_request/url_request_context.h"
#include "net/url_request/url_request_context_getter.h"
namespace atom {
ResolveProxyHelper::ResolveProxyHelper(AtomBrowserContext* browser_context)
: context_getter_(browser_context->GetRequestContext()),
original_thread_(base::ThreadTaskRunnerHandle::Get()) {}
ResolveProxyHelper::~ResolveProxyHelper() {
// Clear all pending requests if the ProxyService is still alive.
pending_requests_.clear();
}
void ResolveProxyHelper::ResolveProxy(const GURL& url,
const ResolveProxyCallback& callback) {
// Enqueue the pending request.
pending_requests_.push_back(PendingRequest(url, callback));
// If nothing is in progress, start.
if (pending_requests_.size() == 1)
StartPendingRequest();
}
void ResolveProxyHelper::StartPendingRequest() {
auto& pending_request = pending_requests_.front();
context_getter_->GetNetworkTaskRunner()->PostTask(
FROM_HERE, base::BindOnce(&ResolveProxyHelper::StartPendingRequestInIO,
base::Unretained(this), pending_request.url));
}
void ResolveProxyHelper::StartPendingRequestInIO(const GURL& url) {
auto* proxy_service =
context_getter_->GetURLRequestContext()->proxy_resolution_service();
// Start the request.
int result = proxy_service->ResolveProxy(
url, std::string(), &proxy_info_,
base::Bind(&ResolveProxyHelper::OnProxyResolveComplete,
base::RetainedRef(this)),
nullptr, nullptr, net::NetLogWithSource());
// Completed synchronously.
if (result != net::ERR_IO_PENDING)
OnProxyResolveComplete(result);
}
void ResolveProxyHelper::OnProxyResolveComplete(int result) {
DCHECK(!pending_requests_.empty());
std::string proxy;
if (result == net::OK)
proxy = proxy_info_.ToPacString();
original_thread_->PostTask(
FROM_HERE, base::BindOnce(&ResolveProxyHelper::SendProxyResult,
base::RetainedRef(this), proxy));
}
void ResolveProxyHelper::SendProxyResult(const std::string& proxy) {
DCHECK(!pending_requests_.empty());
const auto& completed_request = pending_requests_.front();
if (!completed_request.callback.is_null())
completed_request.callback.Run(proxy);
// Clear the current (completed) request.
pending_requests_.pop_front();
// Start the next request.
if (!pending_requests_.empty())
StartPendingRequest();
}
ResolveProxyHelper::PendingRequest::PendingRequest(
const GURL& url,
const ResolveProxyCallback& callback)
: url(url), callback(callback) {}
ResolveProxyHelper::PendingRequest::PendingRequest(
ResolveProxyHelper::PendingRequest&& pending_request) = default;
ResolveProxyHelper::PendingRequest::~PendingRequest() noexcept = default;
ResolveProxyHelper::PendingRequest& ResolveProxyHelper::PendingRequest::
operator=(ResolveProxyHelper::PendingRequest&& pending_request) noexcept =
default;
} // namespace atom