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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/media/router/discovery/dial/dial_app_discovery_service.h"
#include <vector>
#include "base/functional/bind.h"
#include "base/metrics/histogram_macros.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "base/strings/to_string.h"
#include "base/time/default_clock.h"
#include "chrome/browser/media/router/data_decoder_util.h"
#include "net/http/http_status_code.h"
#include "url/gurl.h"
namespace media_router {
namespace {
const char kLoggerComponent[] = "DialAppDiscoveryService";
GURL GetAppUrl(const media_router::MediaSinkInternal& sink,
const std::string& app_name) {
// The DIAL spec (Section 5.4) implies that the app URL must not have a
// trailing slash.
GURL partial_app_url = sink.dial_data().app_url;
return GURL(partial_app_url.spec() + "/" + app_name);
}
void RecordDialFetchAppInfo(DialAppInfoResultCode result_code) {
UMA_HISTOGRAM_ENUMERATION("MediaRouter.Dial.FetchAppInfo", result_code,
DialAppInfoResultCode::kCount);
}
} // namespace
DialAppInfoResult::DialAppInfoResult(
std::unique_ptr<ParsedDialAppInfo> app_info,
DialAppInfoResultCode result_code,
const std::string& error_message,
std::optional<int> http_error_code)
: app_info(std::move(app_info)),
result_code(result_code),
error_message(error_message),
http_error_code(http_error_code) {}
DialAppInfoResult::DialAppInfoResult(DialAppInfoResult&& other) = default;
DialAppInfoResult::~DialAppInfoResult() = default;
DialAppDiscoveryService::DialAppDiscoveryService()
: parser_(std::make_unique<SafeDialAppInfoParser>()) {}
DialAppDiscoveryService::~DialAppDiscoveryService() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
}
// Always query the device to get current app status.
void DialAppDiscoveryService::FetchDialAppInfo(
const MediaSinkInternal& sink,
const std::string& app_name,
DialAppInfoCallback app_info_cb) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
pending_requests_.push_back(
std::make_unique<DialAppDiscoveryService::PendingRequest>(
sink, app_name, std::move(app_info_cb), this));
pending_requests_.back()->Start();
}
void DialAppDiscoveryService::SetParserForTest(
std::unique_ptr<SafeDialAppInfoParser> parser) {
parser_ = std::move(parser);
}
void DialAppDiscoveryService::RemovePendingRequest(
DialAppDiscoveryService::PendingRequest* request) {
std::erase_if(pending_requests_, [&request](const auto& entry) {
return entry.get() == request;
});
}
DialAppDiscoveryService::PendingRequest::PendingRequest(
const MediaSinkInternal& sink,
const std::string& app_name,
DialAppInfoCallback app_info_cb,
DialAppDiscoveryService* const service)
: sink_id_(sink.sink().id()),
app_name_(app_name),
app_url_(GetAppUrl(sink, app_name)),
// |base::Unretained(this)| since |fetcher_| is owned by |this|.
fetcher_(
base::BindOnce(&DialAppDiscoveryService::PendingRequest::
OnDialAppInfoFetchComplete,
base::Unretained(this)),
base::BindOnce(
&DialAppDiscoveryService::PendingRequest::OnDialAppInfoFetchError,
base::Unretained(this))),
app_info_cb_(std::move(app_info_cb)),
service_(service) {}
DialAppDiscoveryService::PendingRequest::~PendingRequest() {
DCHECK(app_info_cb_.is_null());
}
void DialAppDiscoveryService::PendingRequest::Start() {
fetcher_.Get(app_url_);
}
void DialAppDiscoveryService::PendingRequest::OnDialAppInfoFetchComplete(
const std::string& app_info_xml) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
service_->parser_->Parse(
app_info_xml,
base::BindOnce(
&DialAppDiscoveryService::PendingRequest::OnDialAppInfoParsed,
weak_ptr_factory_.GetWeakPtr()));
}
void DialAppDiscoveryService::PendingRequest::OnDialAppInfoFetchError(
const std::string& error_message,
std::optional<int> http_response_code) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
auto result_code = DialAppInfoResultCode::kNetworkError;
if (http_response_code) {
if (*http_response_code >= 200 && *http_response_code < 300) {
result_code = DialAppInfoResultCode::kParsingError;
} else {
result_code = DialAppInfoResultCode::kHttpError;
}
}
RecordDialFetchAppInfo(result_code);
std::move(app_info_cb_)
.Run(sink_id_, app_name_,
DialAppInfoResult(nullptr, result_code, error_message,
http_response_code));
service_->RemovePendingRequest(this);
}
void DialAppDiscoveryService::PendingRequest::OnDialAppInfoParsed(
std::unique_ptr<ParsedDialAppInfo> parsed_app_info,
SafeDialAppInfoParser::ParsingResult parsing_result) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (!parsed_app_info) {
RecordDialFetchAppInfo(DialAppInfoResultCode::kParsingError);
std::move(app_info_cb_)
.Run(sink_id_, app_name_,
DialAppInfoResult(nullptr, DialAppInfoResultCode::kParsingError));
} else {
LoggerList::GetInstance()->Log(
LoggerImpl::Severity::kInfo, mojom::LogCategory::kDiscovery,
kLoggerComponent,
base::StringPrintf("DIAL sink supports disconnect: %s",
base::ToString(parsed_app_info->allow_stop)),
sink_id_, "", "");
RecordDialFetchAppInfo(DialAppInfoResultCode::kOk);
std::move(app_info_cb_)
.Run(sink_id_, app_name_,
DialAppInfoResult(std::move(parsed_app_info),
DialAppInfoResultCode::kOk));
}
service_->RemovePendingRequest(this);
}
} // namespace media_router
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