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// Copyright 2015 The Cobalt Authors. All Rights Reserved.
//
// 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.
#ifndef COBALT_LOADER_NET_FETCHER_H_
#define COBALT_LOADER_NET_FETCHER_H_
#include <memory>
#include <string>
#include "base/cancelable_callback.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "base/message_loop/message_loop.h"
#include "base/threading/thread_checker.h"
#include "cobalt/csp/content_security_policy.h"
#include "cobalt/loader/fetcher.h"
#include "cobalt/network/network_module.h"
#include "net/url_request/url_fetcher.h"
#include "net/url_request/url_fetcher_delegate.h"
#include "url/gurl.h"
namespace cobalt {
namespace loader {
// NetFetcher is for fetching data from the network.
class NetFetcher : public Fetcher, public net::URLFetcherDelegate {
public:
struct Options {
public:
Options() : request_method(net::URLFetcher::GET) {}
net::URLFetcher::RequestType request_method;
};
NetFetcher(const GURL& url, const csp::SecurityCallback& security_callback,
Handler* handler, const network::NetworkModule* network_module,
const Options& options, RequestMode request_mode,
const Origin& origin);
~NetFetcher() override;
// net::URLFetcherDelegate interface
void OnURLFetchResponseStarted(const net::URLFetcher* source) override;
void OnURLFetchComplete(const net::URLFetcher* source) override;
void OnURLFetchDownloadProgress(const net::URLFetcher* source,
int64_t current, int64_t total,
int64_t current_network_bytes) override;
net::URLFetcher* url_fetcher() const {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
return url_fetcher_.get();
}
private:
// Fetcher interface
Origin last_url_origin() const override { return last_url_origin_; }
bool did_fail_from_transient_error() const override {
return did_fail_from_transient_error_;
}
void Start();
// Empty struct to ensure the caller of |HandleError()| knows that |this|
// may have been destroyed and handles it appropriately.
struct ReturnWrapper {
void InvalidateThis() {}
};
// Call our Handler to indicate an error, and cancel the ongoing fetch.
// It may be that the Handler::OnError() callback will result in
// destroying |this|. The caller should return immediately after calling
// this function.
// TODO: Fetchers should probably be refcounted so they can
// guard against being destroyed by callbacks.
ReturnWrapper HandleError(const std::string& error_message)
WARN_UNUSED_RESULT;
// Thread checker ensures all calls to the NetFetcher are made from the same
// thread that it is created in.
THREAD_CHECKER(thread_checker_);
std::unique_ptr<net::URLFetcher> url_fetcher_;
csp::SecurityCallback security_callback_;
// Ensure we can cancel any in-flight Start() task if we are destroyed
// after being constructed, but before Start() runs.
base::CancelableClosure start_callback_;
// True if request mode is CORS and request URL's origin is different from
// request's origin.
bool request_cross_origin_;
// The request's origin.
Origin origin_;
// Indicates whether the resource is cross-origin.
Origin last_url_origin_;
// Whether or not the fetcher failed from an error that is considered
// transient, indicating that the same fetch may later succeed.
bool did_fail_from_transient_error_ = false;
DISALLOW_COPY_AND_ASSIGN(NetFetcher);
};
} // namespace loader
} // namespace cobalt
#endif // COBALT_LOADER_NET_FETCHER_H_