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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 
27 namespace perfetto {
28 namespace ipc {
29 
ServiceProxy(EventListener * event_listener)30 ServiceProxy::ServiceProxy(EventListener* event_listener)
31     : event_listener_(event_listener), weak_ptr_factory_(this) {}
32 
~ServiceProxy()33 ServiceProxy::~ServiceProxy() {
34   if (client_ && connected())
35     client_->UnbindService(service_id_);
36 };
37 
InitializeBinding(base::WeakPtr<Client> client,ServiceID service_id,std::map<std::string,MethodID> remote_method_ids)38 void 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 
BeginInvoke(const std::string & method_name,const ProtoMessage & request,DeferredBase reply,int fd)47 void 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 
EndInvoke(RequestID request_id,std::unique_ptr<ProtoMessage> result,bool has_more)81 void 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 
OnConnect(bool success)99 void 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 
OnDisconnect()107 void ServiceProxy::OnDisconnect() {
108   pending_callbacks_.clear();  // Will Reject() all the pending callbacks.
109   event_listener_->OnDisconnect();
110 }
111 
GetWeakPtr() const112 base::WeakPtr<ServiceProxy> ServiceProxy::GetWeakPtr() const {
113   return weak_ptr_factory_.GetWeakPtr();
114 }
115 
116 }  // namespace ipc
117 }  // namespace perfetto
118