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
|
// Copyright 2013 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/public/cpp/bindings/lib/connector.h"
#include <assert.h>
#include <stdlib.h>
#include "mojo/public/cpp/bindings/error_handler.h"
namespace mojo {
namespace internal {
// ----------------------------------------------------------------------------
Connector::Connector(ScopedMessagePipeHandle message_pipe,
MojoAsyncWaiter* waiter)
: error_handler_(NULL),
waiter_(waiter),
message_pipe_(message_pipe.Pass()),
incoming_receiver_(NULL),
async_wait_id_(0),
error_(false),
drop_writes_(false),
enforce_errors_from_incoming_receiver_(true) {
// Even though we don't have an incoming receiver, we still want to monitor
// the message pipe to know if is closed or encounters an error.
WaitToReadMore();
}
Connector::~Connector() {
if (async_wait_id_)
waiter_->CancelWait(waiter_, async_wait_id_);
}
void Connector::CloseMessagePipe() {
Close(message_pipe_.Pass());
}
ScopedMessagePipeHandle Connector::PassMessagePipe() {
if (async_wait_id_) {
waiter_->CancelWait(waiter_, async_wait_id_);
async_wait_id_ = 0;
}
return message_pipe_.Pass();
}
bool Connector::Accept(Message* message) {
assert(message_pipe_.is_valid());
if (error_)
return false;
if (drop_writes_)
return true;
MojoResult rv = WriteMessageRaw(
message_pipe_.get(),
message->data(),
message->data_num_bytes(),
message->mutable_handles()->empty() ? NULL :
reinterpret_cast<const MojoHandle*>(
&message->mutable_handles()->front()),
static_cast<uint32_t>(message->mutable_handles()->size()),
MOJO_WRITE_MESSAGE_FLAG_NONE);
switch (rv) {
case MOJO_RESULT_OK:
// The handles were successfully transferred, so we don't need the message
// to track their lifetime any longer.
message->mutable_handles()->clear();
break;
case MOJO_RESULT_FAILED_PRECONDITION:
// There's no point in continuing to write to this pipe since the other
// end is gone. Avoid writing any future messages. Hide write failures
// from the caller since we'd like them to continue consuming any backlog
// of incoming messages before regarding the message pipe as closed.
drop_writes_ = true;
break;
default:
// This particular write was rejected, presumably because of bad input.
// The pipe is not necessarily in a bad state.
return false;
}
return true;
}
// static
void Connector::CallOnHandleReady(void* closure, MojoResult result) {
Connector* self = static_cast<Connector*>(closure);
self->OnHandleReady(result);
}
void Connector::OnHandleReady(MojoResult result) {
async_wait_id_ = 0;
if (result == MOJO_RESULT_OK) {
ReadMore();
} else {
error_ = true;
}
if (error_ && error_handler_)
error_handler_->OnConnectionError();
}
void Connector::WaitToReadMore() {
async_wait_id_ = waiter_->AsyncWait(waiter_,
message_pipe_.get().value(),
MOJO_WAIT_FLAG_READABLE,
MOJO_DEADLINE_INDEFINITE,
&Connector::CallOnHandleReady,
this);
}
void Connector::ReadMore() {
while (true) {
bool receiver_result = false;
MojoResult rv = ReadAndDispatchMessage(
message_pipe_.get(), incoming_receiver_, &receiver_result);
if (rv == MOJO_RESULT_SHOULD_WAIT) {
WaitToReadMore();
break;
}
if (rv != MOJO_RESULT_OK ||
(enforce_errors_from_incoming_receiver_ && !receiver_result)) {
error_ = true;
break;
}
}
}
} // namespace internal
} // namespace mojo
|
