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// Copyright 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "cast/sender/cast_platform_client.h"
#include <memory>
#include <random>
#include <utility>
#include "absl/strings/str_cat.h"
#include "cast/common/channel/virtual_connection_router.h"
#include "cast/common/public/cast_socket.h"
#include "cast/common/public/service_info.h"
#include "util/json/json_serialization.h"
#include "util/osp_logging.h"
#include "util/stringprintf.h"
namespace openscreen {
namespace cast {
static constexpr std::chrono::seconds kRequestTimeout = std::chrono::seconds(5);
CastPlatformClient::CastPlatformClient(VirtualConnectionRouter* router,
ClockNowFunctionPtr clock,
TaskRunner* task_runner)
: sender_id_(MakeUniqueSessionId("sender")),
virtual_conn_router_(router),
clock_(clock),
task_runner_(task_runner) {
OSP_DCHECK(virtual_conn_router_);
OSP_DCHECK(clock_);
OSP_DCHECK(task_runner_);
virtual_conn_router_->AddHandlerForLocalId(sender_id_, this);
}
CastPlatformClient::~CastPlatformClient() {
virtual_conn_router_->RemoveConnectionsByLocalId(sender_id_);
virtual_conn_router_->RemoveHandlerForLocalId(sender_id_);
for (auto& pending_requests : pending_requests_by_device_id_) {
for (auto& avail_request : pending_requests.second.availability) {
avail_request.callback(avail_request.app_id,
AppAvailabilityResult::kUnknown);
}
}
}
absl::optional<int> CastPlatformClient::RequestAppAvailability(
const std::string& device_id,
const std::string& app_id,
AppAvailabilityCallback callback) {
auto entry = socket_id_by_device_id_.find(device_id);
if (entry == socket_id_by_device_id_.end()) {
callback(app_id, AppAvailabilityResult::kUnknown);
return absl::nullopt;
}
int socket_id = entry->second;
int request_id = GetNextRequestId();
ErrorOr<::cast::channel::CastMessage> message =
CreateAppAvailabilityRequest(sender_id_, request_id, app_id);
OSP_DCHECK(message);
PendingRequests& pending_requests = pending_requests_by_device_id_[device_id];
auto timeout = std::make_unique<Alarm>(clock_, task_runner_);
timeout->ScheduleFromNow(
[this, request_id]() { CancelAppAvailabilityRequest(request_id); },
kRequestTimeout);
pending_requests.availability.push_back(AvailabilityRequest{
request_id, app_id, std::move(timeout), std::move(callback)});
VirtualConnection virtual_conn{sender_id_, kPlatformReceiverId, socket_id};
if (!virtual_conn_router_->GetConnectionData(virtual_conn)) {
virtual_conn_router_->AddConnection(virtual_conn,
VirtualConnection::AssociatedData{});
}
virtual_conn_router_->Send(std::move(virtual_conn),
std::move(message.value()));
return request_id;
}
void CastPlatformClient::AddOrUpdateReceiver(const ServiceInfo& device,
int socket_id) {
socket_id_by_device_id_[device.unique_id] = socket_id;
}
void CastPlatformClient::RemoveReceiver(const ServiceInfo& device) {
auto pending_requests_it =
pending_requests_by_device_id_.find(device.unique_id);
if (pending_requests_it != pending_requests_by_device_id_.end()) {
for (const AvailabilityRequest& availability :
pending_requests_it->second.availability) {
availability.callback(availability.app_id,
AppAvailabilityResult::kUnknown);
}
pending_requests_by_device_id_.erase(pending_requests_it);
}
socket_id_by_device_id_.erase(device.unique_id);
}
void CastPlatformClient::CancelRequest(int request_id) {
for (auto entry = pending_requests_by_device_id_.begin();
entry != pending_requests_by_device_id_.end(); ++entry) {
auto& pending_requests = entry->second;
auto it = std::find_if(pending_requests.availability.begin(),
pending_requests.availability.end(),
[request_id](const AvailabilityRequest& request) {
return request.request_id == request_id;
});
if (it != pending_requests.availability.end()) {
pending_requests.availability.erase(it);
break;
}
}
}
void CastPlatformClient::OnMessage(VirtualConnectionRouter* router,
CastSocket* socket,
::cast::channel::CastMessage message) {
if (message.payload_type() !=
::cast::channel::CastMessage_PayloadType_STRING ||
message.namespace_() != kReceiverNamespace ||
message.source_id() != kPlatformReceiverId) {
return;
}
ErrorOr<Json::Value> dict_or_error = json::Parse(message.payload_utf8());
if (dict_or_error.is_error()) {
OSP_DVLOG << "Failed to deserialize CastMessage payload.";
return;
}
Json::Value& dict = dict_or_error.value();
absl::optional<int> request_id =
MaybeGetInt(dict, JSON_EXPAND_FIND_CONSTANT_ARGS(kMessageKeyRequestId));
if (request_id) {
auto entry = std::find_if(
socket_id_by_device_id_.begin(), socket_id_by_device_id_.end(),
[socket_id =
ToCastSocketId(socket)](const std::pair<std::string, int>& entry) {
return entry.second == socket_id;
});
if (entry != socket_id_by_device_id_.end()) {
HandleResponse(entry->first, request_id.value(), dict);
}
}
}
void CastPlatformClient::HandleResponse(const std::string& device_id,
int request_id,
const Json::Value& message) {
auto entry = pending_requests_by_device_id_.find(device_id);
if (entry == pending_requests_by_device_id_.end()) {
return;
}
PendingRequests& pending_requests = entry->second;
auto it = std::find_if(pending_requests.availability.begin(),
pending_requests.availability.end(),
[request_id](const AvailabilityRequest& request) {
return request.request_id == request_id;
});
if (it != pending_requests.availability.end()) {
// TODO(btolsch): Can all of this manual parsing/checking be cleaned up into
// a single parsing API along with other message handling?
const Json::Value* maybe_availability =
message.find(JSON_EXPAND_FIND_CONSTANT_ARGS(kMessageKeyAvailability));
if (maybe_availability && maybe_availability->isObject()) {
absl::optional<absl::string_view> result =
MaybeGetString(*maybe_availability, &it->app_id[0],
&it->app_id[0] + it->app_id.size());
if (result) {
AppAvailabilityResult availability_result =
AppAvailabilityResult::kUnknown;
if (result.value() == kMessageValueAppAvailable) {
availability_result = AppAvailabilityResult::kAvailable;
} else if (result.value() == kMessageValueAppUnavailable) {
availability_result = AppAvailabilityResult::kUnavailable;
} else {
OSP_DVLOG << "Invalid availability result: " << result.value();
}
it->callback(it->app_id, availability_result);
}
}
pending_requests.availability.erase(it);
}
}
void CastPlatformClient::CancelAppAvailabilityRequest(int request_id) {
for (auto& entry : pending_requests_by_device_id_) {
PendingRequests& pending_requests = entry.second;
auto it = std::find_if(pending_requests.availability.begin(),
pending_requests.availability.end(),
[request_id](const AvailabilityRequest& request) {
return request.request_id == request_id;
});
if (it != pending_requests.availability.end()) {
it->callback(it->app_id, AppAvailabilityResult::kUnknown);
pending_requests.availability.erase(it);
}
}
}
// static
int CastPlatformClient::GetNextRequestId() {
return next_request_id_++;
}
// static
int CastPlatformClient::next_request_id_ = 0;
} // namespace cast
} // namespace openscreen
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