summaryrefslogtreecommitdiff
path: root/dom/messagechannel/MessagePortParent.cpp
blob: bf68c26301a7280e9d00a989c312a17bd1db4089 (plain)
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
171
172
173
174
175
176
177
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "MessagePortParent.h"
#include "MessagePortService.h"
#include "SharedMessagePortMessage.h"
#include "mozilla/Unused.h"

namespace mozilla {
namespace dom {

MessagePortParent::MessagePortParent(const nsID& aUUID)
  : mService(MessagePortService::GetOrCreate())
  , mUUID(aUUID)
  , mEntangled(false)
  , mCanSendData(true)
{
  MOZ_ASSERT(mService);
}

MessagePortParent::~MessagePortParent()
{
  MOZ_ASSERT(!mService);
  MOZ_ASSERT(!mEntangled);
}

bool
MessagePortParent::Entangle(const nsID& aDestinationUUID,
                            const uint32_t& aSequenceID)
{
  if (!mService) {
    NS_WARNING("Entangle is called after a shutdown!");
    return false;
  }

  MOZ_ASSERT(!mEntangled);

  return mService->RequestEntangling(this, aDestinationUUID, aSequenceID);
}

bool
MessagePortParent::RecvPostMessages(nsTArray<MessagePortMessage>&& aMessages)
{
  // This converts the object in a data struct where we have BlobImpls.
  FallibleTArray<RefPtr<SharedMessagePortMessage>> messages;
  if (NS_WARN_IF(
      !SharedMessagePortMessage::FromMessagesToSharedParent(aMessages,
                                                            messages))) {
    return false;
  }

  if (!mEntangled) {
    return false;
  }

  if (!mService) {
    NS_WARNING("Entangle is called after a shutdown!");
    return false;
  }

  if (messages.IsEmpty()) {
    return false;
  }

  return mService->PostMessages(this, messages);
}

bool
MessagePortParent::RecvDisentangle(nsTArray<MessagePortMessage>&& aMessages)
{
  // This converts the object in a data struct where we have BlobImpls.
  FallibleTArray<RefPtr<SharedMessagePortMessage>> messages;
  if (NS_WARN_IF(
      !SharedMessagePortMessage::FromMessagesToSharedParent(aMessages,
                                                            messages))) {
    return false;
  }

  if (!mEntangled) {
    return false;
  }

  if (!mService) {
    NS_WARNING("Entangle is called after a shutdown!");
    return false;
  }

  if (!mService->DisentanglePort(this, messages)) {
    return false;
  }

  CloseAndDelete();
  return true;
}

bool
MessagePortParent::RecvStopSendingData()
{
  if (!mEntangled) {
    return true;
  }

  mCanSendData = false;
  Unused << SendStopSendingDataConfirmed();
  return true;
}

bool
MessagePortParent::RecvClose()
{
  if (mService) {
    MOZ_ASSERT(mEntangled);

    if (!mService->ClosePort(this)) {
      return false;
    }

    Close();
  }

  MOZ_ASSERT(!mEntangled);

  Unused << Send__delete__(this);
  return true;
}

void
MessagePortParent::ActorDestroy(ActorDestroyReason aWhy)
{
  if (mService && mEntangled) {
    // When the last parent is deleted, this service is freed but this cannot
    // be done when the hashtables are written by CloseAll.
    RefPtr<MessagePortService> kungFuDeathGrip = mService;
    kungFuDeathGrip->ParentDestroy(this);
  }
}

bool
MessagePortParent::Entangled(const nsTArray<MessagePortMessage>& aMessages)
{
  MOZ_ASSERT(!mEntangled);
  mEntangled = true;
  return SendEntangled(aMessages);
}

void
MessagePortParent::CloseAndDelete()
{
  Close();
  Unused << Send__delete__(this);
}

void
MessagePortParent::Close()
{
  mService = nullptr;
  mEntangled = false;
}

/* static */ bool
MessagePortParent::ForceClose(const nsID& aUUID,
                              const nsID& aDestinationUUID,
                              const uint32_t& aSequenceID)
{
  MessagePortService* service =  MessagePortService::Get();
  if (!service) {
    NS_WARNING("The service must exist if we want to close an existing MessagePort.");
    return false;
  }

  return service->ForceClose(aUUID, aDestinationUUID, aSequenceID);
}

} // namespace dom
} // namespace mozilla