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
|
// Copyright 2014 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 "mojo/edk/system/channel_endpoint.h"
#include "base/logging.h"
#include "mojo/edk/system/channel.h"
#include "mojo/edk/system/channel_endpoint_client.h"
#include "mojo/edk/system/transport_data.h"
namespace mojo {
namespace system {
ChannelEndpoint::ChannelEndpoint(ChannelEndpointClient* client,
unsigned client_port,
MessageInTransitQueue* message_queue)
: client_(client), client_port_(client_port), channel_(nullptr) {
DCHECK(client_.get() || message_queue);
if (message_queue)
paused_message_queue_.Swap(message_queue);
}
bool ChannelEndpoint::EnqueueMessage(scoped_ptr<MessageInTransit> message) {
DCHECK(message);
base::AutoLock locker(lock_);
if (!channel_) {
// We may reach here if we haven't been attached/run yet.
// TODO(vtl): We may also reach here if the channel is shut down early for
// some reason (with live message pipes on it). Ideally, we'd return false
// (and not enqueue the message), but we currently don't have a way to check
// this.
paused_message_queue_.AddMessage(message.Pass());
return true;
}
return WriteMessageNoLock(message.Pass());
}
void ChannelEndpoint::DetachFromClient() {
{
base::AutoLock locker(lock_);
DCHECK(client_.get());
client_ = nullptr;
if (!channel_)
return;
DCHECK(local_id_.is_valid());
DCHECK(remote_id_.is_valid());
channel_->DetachEndpoint(this, local_id_, remote_id_);
channel_ = nullptr;
local_id_ = ChannelEndpointId();
remote_id_ = ChannelEndpointId();
}
}
void ChannelEndpoint::AttachAndRun(Channel* channel,
ChannelEndpointId local_id,
ChannelEndpointId remote_id) {
DCHECK(channel);
DCHECK(local_id.is_valid());
DCHECK(remote_id.is_valid());
base::AutoLock locker(lock_);
DCHECK(!channel_);
DCHECK(!local_id_.is_valid());
DCHECK(!remote_id_.is_valid());
channel_ = channel;
local_id_ = local_id;
remote_id_ = remote_id;
while (!paused_message_queue_.IsEmpty()) {
LOG_IF(WARNING, !WriteMessageNoLock(paused_message_queue_.GetMessage()))
<< "Failed to write enqueue message to channel";
}
if (!client_.get()) {
channel_->DetachEndpoint(this, local_id_, remote_id_);
channel_ = nullptr;
local_id_ = ChannelEndpointId();
remote_id_ = ChannelEndpointId();
}
}
bool ChannelEndpoint::OnReadMessage(
const MessageInTransit::View& message_view,
embedder::ScopedPlatformHandleVectorPtr platform_handles) {
scoped_ptr<MessageInTransit> message(new MessageInTransit(message_view));
scoped_refptr<ChannelEndpointClient> client;
unsigned client_port;
{
base::AutoLock locker(lock_);
DCHECK(channel_);
if (!client_.get()) {
// This isn't a failure per se. (It just means that, e.g., the other end
// of the message point closed first.)
return true;
}
if (message_view.transport_data_buffer_size() > 0) {
DCHECK(message_view.transport_data_buffer());
message->SetDispatchers(TransportData::DeserializeDispatchers(
message_view.transport_data_buffer(),
message_view.transport_data_buffer_size(), platform_handles.Pass(),
channel_));
}
// Take a ref, and call |OnReadMessage()| outside the lock.
client = client_;
client_port = client_port_;
}
return client->OnReadMessage(client_port, message.Pass());
}
void ChannelEndpoint::DetachFromChannel() {
scoped_refptr<ChannelEndpointClient> client;
unsigned client_port = 0;
{
base::AutoLock locker(lock_);
if (client_.get()) {
// Take a ref, and call |OnDetachFromChannel()| outside the lock.
client = client_;
client_port = client_port_;
}
// |channel_| may already be null if we already detached from the channel in
// |DetachFromClient()| by calling |Channel::DetachEndpoint()| (and there
// are racing detaches).
if (channel_) {
DCHECK(local_id_.is_valid());
DCHECK(remote_id_.is_valid());
channel_ = nullptr;
local_id_ = ChannelEndpointId();
remote_id_ = ChannelEndpointId();
}
}
if (client.get())
client->OnDetachFromChannel(client_port);
}
ChannelEndpoint::~ChannelEndpoint() {
DCHECK(!client_.get());
DCHECK(!channel_);
DCHECK(!local_id_.is_valid());
DCHECK(!remote_id_.is_valid());
}
bool ChannelEndpoint::WriteMessageNoLock(scoped_ptr<MessageInTransit> message) {
DCHECK(message);
lock_.AssertAcquired();
DCHECK(channel_);
DCHECK(local_id_.is_valid());
DCHECK(remote_id_.is_valid());
message->SerializeAndCloseDispatchers(channel_);
message->set_source_id(local_id_);
message->set_destination_id(remote_id_);
return channel_->WriteMessage(message.Pass());
}
} // namespace system
} // namespace mojo
|
