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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "network/public/cpp/web_socket_write_queue.h" | |
| 6 | |
| 7 #include <stdint.h> | |
| 8 | |
| 9 #include "base/bind.h" | |
| 10 #include "base/logging.h" | |
| 11 | |
| 12 namespace mojo { | |
| 13 | |
| 14 struct WebSocketWriteQueue::Operation { | |
| 15 uint32_t num_bytes_; | |
| 16 base::Callback<void(const char*)> callback_; | |
| 17 | |
| 18 const char* data_; | |
| 19 // Only initialized if the initial Write fails. This saves a copy in | |
| 20 // the common case. | |
| 21 std::vector<char> data_copy_; | |
| 22 }; | |
| 23 | |
| 24 WebSocketWriteQueue::WebSocketWriteQueue(DataPipeProducerHandle handle) | |
| 25 : handle_(handle), is_busy_(false), weak_factory_(this) { | |
| 26 } | |
| 27 | |
| 28 WebSocketWriteQueue::~WebSocketWriteQueue() { | |
| 29 } | |
| 30 | |
| 31 void WebSocketWriteQueue::Write(const char* data, | |
| 32 uint32_t num_bytes, | |
| 33 base::Callback<void(const char*)> callback) { | |
| 34 Operation* op = new Operation; | |
| 35 op->num_bytes_ = num_bytes; | |
| 36 op->callback_ = callback; | |
| 37 op->data_ = data; | |
| 38 queue_.push_back(op); | |
| 39 | |
| 40 if (!is_busy_) { | |
| 41 is_busy_ = true; | |
| 42 // This call may reset |is_busy_| to false. | |
| 43 TryToWrite(); | |
| 44 } | |
| 45 | |
| 46 if (is_busy_) { | |
| 47 // If we have to wait, make a local copy of the data so we know it will | |
| 48 // live until we need it. | |
| 49 op->data_copy_.resize(num_bytes); | |
| 50 memcpy(&op->data_copy_[0], data, num_bytes); | |
| 51 op->data_ = &op->data_copy_[0]; | |
| 52 } | |
| 53 } | |
| 54 | |
| 55 void WebSocketWriteQueue::TryToWrite() { | |
| 56 DCHECK(is_busy_); | |
| 57 DCHECK(!queue_.empty()); | |
| 58 do { | |
| 59 Operation* op = queue_[0]; | |
| 60 uint32_t bytes_written = op->num_bytes_; | |
| 61 MojoResult result = WriteDataRaw( | |
| 62 handle_, op->data_, &bytes_written, MOJO_WRITE_DATA_FLAG_ALL_OR_NONE); | |
| 63 if (result == MOJO_RESULT_SHOULD_WAIT) { | |
| 64 Wait(); | |
| 65 return; | |
| 66 } | |
| 67 | |
| 68 // Ensure |op| is deleted, whether or not |this| goes away. | |
| 69 scoped_ptr<Operation> op_deleter(op); | |
| 70 queue_.weak_erase(queue_.begin()); | |
| 71 | |
| 72 // http://crbug.com/490193 This should run callback as well. May need to | |
| 73 // change the callback signature. | |
| 74 if (result != MOJO_RESULT_OK) | |
| 75 return; | |
| 76 | |
| 77 base::WeakPtr<WebSocketWriteQueue> self(weak_factory_.GetWeakPtr()); | |
| 78 | |
| 79 // This call may delete |this|. In that case, |self| will be invalidated. | |
| 80 // It may re-enter Write() too. Because |is_busy_| is true during the whole | |
| 81 // process, TryToWrite() won't be re-entered. | |
| 82 op->callback_.Run(op->data_); | |
| 83 | |
| 84 if (!self) | |
| 85 return; | |
| 86 } while (!queue_.empty()); | |
| 87 is_busy_ = false; | |
| 88 } | |
| 89 | |
| 90 void WebSocketWriteQueue::Wait() { | |
| 91 DCHECK(is_busy_); | |
| 92 handle_watcher_.Start(handle_, | |
| 93 MOJO_HANDLE_SIGNAL_WRITABLE, | |
| 94 MOJO_DEADLINE_INDEFINITE, | |
| 95 base::Bind(&WebSocketWriteQueue::OnHandleReady, | |
| 96 base::Unretained(this))); | |
| 97 } | |
| 98 | |
| 99 void WebSocketWriteQueue::OnHandleReady(MojoResult result) { | |
| 100 DCHECK(is_busy_); | |
| 101 TryToWrite(); | |
| 102 } | |
| 103 | |
| 104 } // namespace mojo | |
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Chromium Code Reviews
Issue 1873463003:
Remove mojo network service. (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master