1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
|
// 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/receiver_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_receiver_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& receiver_id,
const std::string& app_id,
AppAvailabilityCallback callback) {
auto entry = socket_id_by_receiver_id_.find(receiver_id);
if (entry == socket_id_by_receiver_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_receiver_id_[receiver_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 ReceiverInfo& receiver,
int socket_id) {
socket_id_by_receiver_id_[receiver.unique_id] = socket_id;
}
void CastPlatformClient::RemoveReceiver(const ReceiverInfo& receiver) {
auto pending_requests_it =
pending_requests_by_receiver_id_.find(receiver.unique_id);
if (pending_requests_it != pending_requests_by_receiver_id_.end()) {
for (const AvailabilityRequest& availability :
pending_requests_it->second.availability) {
availability.callback(availability.app_id,
AppAvailabilityResult::kUnknown);
}
pending_requests_by_receiver_id_.erase(pending_requests_it);
}
socket_id_by_receiver_id_.erase(receiver.unique_id);
}
void CastPlatformClient::CancelRequest(int request_id) {
for (auto entry = pending_requests_by_receiver_id_.begin();
entry != pending_requests_by_receiver_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()) {
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_receiver_id_.begin(), socket_id_by_receiver_id_.end(),
[socket_id =
ToCastSocketId(socket)](const std::pair<std::string, int>& entry) {
return entry.second == socket_id;
});
if (entry != socket_id_by_receiver_id_.end()) {
HandleResponse(entry->first, request_id.value(), dict);
}
}
}
void CastPlatformClient::HandleResponse(const std::string& receiver_id,
int request_id,
const Json::Value& message) {
auto entry = pending_requests_by_receiver_id_.find(receiver_id);
if (entry == pending_requests_by_receiver_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_VLOG << "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_receiver_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
|
