1/*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include "perfetto/ipc/service_proxy.h"
18
19#include <utility>
20
21#include "google/protobuf/message_lite.h"
22#include "perfetto/base/logging.h"
23#include "perfetto/base/weak_ptr.h"
24#include "perfetto/ipc/service_descriptor.h"
25#include "src/ipc/client_impl.h"
26
27namespace perfetto {
28namespace ipc {
29
30ServiceProxy::ServiceProxy(EventListener* event_listener)
31    : event_listener_(event_listener), weak_ptr_factory_(this) {}
32
33ServiceProxy::~ServiceProxy() {
34  if (client_ && connected())
35    client_->UnbindService(service_id_);
36};
37
38void ServiceProxy::InitializeBinding(
39    base::WeakPtr<Client> client,
40    ServiceID service_id,
41    std::map<std::string, MethodID> remote_method_ids) {
42  client_ = std::move(client);
43  service_id_ = service_id;
44  remote_method_ids_ = std::move(remote_method_ids);
45}
46
47void ServiceProxy::BeginInvoke(const std::string& method_name,
48                               const ProtoMessage& request,
49                               DeferredBase reply,
50                               int fd) {
51  // |reply| will auto-resolve if it gets out of scope early.
52  if (!connected()) {
53    PERFETTO_DCHECK(false);
54    return;
55  }
56  if (!client_)
57    return;  // The Client object has been destroyed in the meantime.
58
59  auto remote_method_it = remote_method_ids_.find(method_name);
60  RequestID request_id = 0;
61  const bool drop_reply = !reply.IsBound();
62  if (remote_method_it != remote_method_ids_.end()) {
63    request_id =
64        static_cast<ClientImpl*>(client_.get())
65            ->BeginInvoke(service_id_, method_name, remote_method_it->second,
66                          request, drop_reply, weak_ptr_factory_.GetWeakPtr(),
67                          fd);
68  } else {
69    PERFETTO_DLOG("Cannot find method \"%s\" on the host", method_name.c_str());
70  }
71
72  // When passing |drop_reply| == true, the returned |request_id| should be 0.
73  PERFETTO_DCHECK(!drop_reply || !request_id);
74
75  if (!request_id)
76    return;
77  PERFETTO_DCHECK(pending_callbacks_.count(request_id) == 0);
78  pending_callbacks_.emplace(request_id, std::move(reply));
79}
80
81void ServiceProxy::EndInvoke(RequestID request_id,
82                             std::unique_ptr<ProtoMessage> result,
83                             bool has_more) {
84  auto callback_it = pending_callbacks_.find(request_id);
85  if (callback_it == pending_callbacks_.end()) {
86    // Either we are getting a reply for a method we never invoked, or we are
87    // getting a reply to a method marked drop_reply (that has been invoked
88    // without binding any callback in the Defererd response object).
89    PERFETTO_DCHECK(false);
90    return;
91  }
92  DeferredBase& reply_callback = callback_it->second;
93  AsyncResult<ProtoMessage> reply(std::move(result), has_more);
94  reply_callback.Resolve(std::move(reply));
95  if (!has_more)
96    pending_callbacks_.erase(callback_it);
97}
98
99void ServiceProxy::OnConnect(bool success) {
100  if (success) {
101    PERFETTO_DCHECK(service_id_);
102    return event_listener_->OnConnect();
103  }
104  return event_listener_->OnDisconnect();
105}
106
107void ServiceProxy::OnDisconnect() {
108  pending_callbacks_.clear();  // Will Reject() all the pending callbacks.
109  event_listener_->OnDisconnect();
110}
111
112base::WeakPtr<ServiceProxy> ServiceProxy::GetWeakPtr() const {
113  return weak_ptr_factory_.GetWeakPtr();
114}
115
116}  // namespace ipc
117}  // namespace perfetto
118