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// Copyright 2015 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 "blimp/net/blimp_message_output_buffer.h"
#include <algorithm>
#include "base/macros.h"
#include "base/message_loop/message_loop.h"
#include "blimp/common/logging.h"
#include "blimp/common/proto/blimp_message.pb.h"
#include "net/base/net_errors.h"
namespace blimp {
BlimpMessageOutputBuffer::BlimpMessageOutputBuffer(int max_buffer_size_bytes)
: max_buffer_size_bytes_(max_buffer_size_bytes) {}
BlimpMessageOutputBuffer::~BlimpMessageOutputBuffer() {}
void BlimpMessageOutputBuffer::SetOutputProcessor(
BlimpMessageProcessor* processor) {
DVLOG(1) << "SetOutputProcessor " << processor;
// Check that we are setting or removing the processor, not replacing it.
if (processor) {
DCHECK(!output_processor_);
output_processor_ = processor;
write_complete_cb_.Reset(base::Bind(
&BlimpMessageOutputBuffer::OnWriteComplete, base::Unretained(this)));
WriteNextMessageIfReady();
} else {
DCHECK(output_processor_);
output_processor_ = nullptr;
write_complete_cb_.Cancel();
}
}
void BlimpMessageOutputBuffer::RetransmitBufferedMessages() {
DCHECK(output_processor_);
DVLOG(1) << "RetransmitBufferedMessages()";
// Prepend the entirety of |ack_buffer_| to |write_buffer_|.
write_buffer_.insert(write_buffer_.begin(),
std::make_move_iterator(ack_buffer_.begin()),
std::make_move_iterator(ack_buffer_.end()));
ack_buffer_.clear();
WriteNextMessageIfReady();
}
int BlimpMessageOutputBuffer::GetBufferByteSizeForTest() const {
return write_buffer_.size() + ack_buffer_.size();
}
int BlimpMessageOutputBuffer::GetUnacknowledgedMessageCountForTest() const {
return ack_buffer_.size();
}
void BlimpMessageOutputBuffer::ProcessMessage(
scoped_ptr<BlimpMessage> message,
const net::CompletionCallback& callback) {
DVLOG(2) << "OutputBuffer::ProcessMessage " << *message;
message->set_message_id(++prev_message_id_);
current_buffer_size_bytes_ += message->ByteSize();
if (max_buffer_size_bytes_ < current_buffer_size_bytes_)
DLOG(WARNING) << "Output Buffer Size exceeds " << max_buffer_size_bytes_
<< "bytes. Current size: " << current_buffer_size_bytes_
<< " bytes.";
write_buffer_.push_back(
make_scoped_ptr(new BufferEntry(std::move(message), callback)));
// Write the message
if (write_buffer_.size() == 1 && output_processor_) {
WriteNextMessageIfReady();
}
}
// Flushes acknowledged messages from the buffer and invokes their
// |callbacks|, if any.
void BlimpMessageOutputBuffer::OnMessageCheckpoint(int64_t message_id) {
VLOG(2) << "OnMessageCheckpoint (message_id=" << message_id << ")";
if (ack_buffer_.empty()) {
LOG(WARNING) << "Checkpoint called while buffer is empty.";
return;
}
if (message_id > prev_message_id_) {
LOG(WARNING) << "Illegal checkpoint response: " << message_id;
return;
}
// Remove all acknowledged messages through |message_id| and invoke their
// write callbacks, if set.
while (!ack_buffer_.empty() &&
ack_buffer_.front()->message->message_id() <= message_id) {
const BufferEntry& ack_entry = *ack_buffer_.front();
current_buffer_size_bytes_ -= ack_entry.message->GetCachedSize();
DCHECK_GE(current_buffer_size_bytes_, 0);
VLOG(3) << "Buffer size: " << current_buffer_size_bytes_
<< " (max=" << current_buffer_size_bytes_ << ")";
if (!ack_entry.callback.is_null()) {
base::MessageLoop::current()->PostTask(
FROM_HERE, base::Bind(ack_entry.callback, net::OK));
}
ack_buffer_.pop_front();
}
// An empty buffer should have a zero-byte footprint.
DCHECK(current_buffer_size_bytes_ > 0 ||
(ack_buffer_.empty() && write_buffer_.empty()))
<< "Expected zero-length buffer size, was " << current_buffer_size_bytes_
<< " bytes instead.";
}
BlimpMessageOutputBuffer::BufferEntry::BufferEntry(
scoped_ptr<BlimpMessage> message,
net::CompletionCallback callback)
: message(std::move(message)), callback(callback) {}
BlimpMessageOutputBuffer::BufferEntry::~BufferEntry() {}
void BlimpMessageOutputBuffer::WriteNextMessageIfReady() {
DVLOG(3) << "WriteNextMessageIfReady";
if (write_buffer_.empty()) {
DVLOG(3) << "Nothing to write.";
return;
}
scoped_ptr<BlimpMessage> message_to_write(
new BlimpMessage(*write_buffer_.front()->message));
DVLOG(3) << "Writing message (id="
<< write_buffer_.front()->message->message_id()
<< ", type=" << message_to_write->type() << ")";
output_processor_->ProcessMessage(std::move(message_to_write),
write_complete_cb_.callback());
DVLOG(3) << "Queue size: " << write_buffer_.size();
}
void BlimpMessageOutputBuffer::OnWriteComplete(int result) {
DCHECK_LE(result, net::OK);
VLOG(2) << "Write complete, result=" << result;
if (result == net::OK) {
ack_buffer_.push_back(std::move(write_buffer_.front()));
write_buffer_.pop_front();
WriteNextMessageIfReady();
} else {
// An error occurred while writing to the network connection.
// Stop writing more messages until a new connection is established.
DLOG(WARNING) << "Write error (result=" << result << ")";
}
}
} // namespace blimp
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