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/ext/ipc/service_proxy.h"
18
19 #include <utility>
20
21 #include "perfetto/base/logging.h"
22 #include "perfetto/ext/base/weak_ptr.h"
23 #include "perfetto/ext/ipc/service_descriptor.h"
24 #include "src/ipc/client_impl.h"
25
26 #include "protos/perfetto/ipc/wire_protocol.gen.h"
27
28 namespace perfetto {
29 namespace ipc {
30
ServiceProxy(EventListener * event_listener)31 ServiceProxy::ServiceProxy(EventListener* event_listener)
32 : event_listener_(event_listener), weak_ptr_factory_(this) {}
33
~ServiceProxy()34 ServiceProxy::~ServiceProxy() {
35 if (client_ && connected())
36 client_->UnbindService(service_id_);
37 }
38
InitializeBinding(base::WeakPtr<Client> client,ServiceID service_id,std::map<std::string,MethodID> remote_method_ids)39 void ServiceProxy::InitializeBinding(
40 base::WeakPtr<Client> client,
41 ServiceID service_id,
42 std::map<std::string, MethodID> remote_method_ids) {
43 client_ = std::move(client);
44 service_id_ = service_id;
45 remote_method_ids_ = std::move(remote_method_ids);
46 }
47
BeginInvoke(const std::string & method_name,const ProtoMessage & request,DeferredBase reply,int fd)48 void ServiceProxy::BeginInvoke(const std::string& method_name,
49 const ProtoMessage& request,
50 DeferredBase reply,
51 int fd) {
52 // |reply| will auto-resolve if it gets out of scope early.
53 if (!connected()) {
54 PERFETTO_DFATAL("Not connected.");
55 return;
56 }
57 if (!client_)
58 return; // The Client object has been destroyed in the meantime.
59
60 auto remote_method_it = remote_method_ids_.find(method_name);
61 RequestID request_id = 0;
62 const bool drop_reply = !reply.IsBound();
63 if (remote_method_it != remote_method_ids_.end()) {
64 request_id =
65 static_cast<ClientImpl*>(client_.get())
66 ->BeginInvoke(service_id_, method_name, remote_method_it->second,
67 request, drop_reply, weak_ptr_factory_.GetWeakPtr(),
68 fd);
69 } else {
70 PERFETTO_DLOG("Cannot find method \"%s\" on the host", method_name.c_str());
71 }
72
73 // When passing |drop_reply| == true, the returned |request_id| should be 0.
74 PERFETTO_DCHECK(!drop_reply || !request_id);
75
76 if (!request_id)
77 return;
78 PERFETTO_DCHECK(pending_callbacks_.count(request_id) == 0);
79 pending_callbacks_.emplace(request_id, std::move(reply));
80 }
81
EndInvoke(RequestID request_id,std::unique_ptr<ProtoMessage> result,bool has_more)82 void ServiceProxy::EndInvoke(RequestID request_id,
83 std::unique_ptr<ProtoMessage> result,
84 bool has_more) {
85 auto callback_it = pending_callbacks_.find(request_id);
86 if (callback_it == pending_callbacks_.end()) {
87 // Either we are getting a reply for a method we never invoked, or we are
88 // getting a reply to a method marked drop_reply (that has been invoked
89 // without binding any callback in the Defererd response object).
90 PERFETTO_DFATAL("Unexpected reply received.");
91 return;
92 }
93 DeferredBase& reply_callback = callback_it->second;
94 AsyncResult<ProtoMessage> reply(std::move(result), has_more);
95 reply_callback.Resolve(std::move(reply));
96 if (!has_more)
97 pending_callbacks_.erase(callback_it);
98 }
99
OnConnect(bool success)100 void ServiceProxy::OnConnect(bool success) {
101 if (success) {
102 PERFETTO_DCHECK(service_id_);
103 return event_listener_->OnConnect();
104 }
105 return event_listener_->OnDisconnect();
106 }
107
OnDisconnect()108 void ServiceProxy::OnDisconnect() {
109 pending_callbacks_.clear(); // Will Reject() all the pending callbacks.
110 event_listener_->OnDisconnect();
111 }
112
GetWeakPtr() const113 base::WeakPtr<ServiceProxy> ServiceProxy::GetWeakPtr() const {
114 return weak_ptr_factory_.GetWeakPtr();
115 }
116
117 } // namespace ipc
118 } // namespace perfetto
119