mirror of
https://github.com/facebook/rocksdb.git
synced 2024-12-04 20:02:50 +00:00
80c663882a
Summary: First draft. Unit tests pass. Test Plan: unit tests attached Reviewers: heyongqiang Reviewed By: heyongqiang Differential Revision: https://reviews.facebook.net/D3969
127 lines
4.5 KiB
C++
127 lines
4.5 KiB
C++
/*
|
|
* Licensed to the Apache Software Foundation (ASF) under one
|
|
* or more contributor license agreements. See the NOTICE file
|
|
* distributed with this work for additional information
|
|
* regarding copyright ownership. The ASF licenses this file
|
|
* to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance
|
|
* with the License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing,
|
|
* software distributed under the License is distributed on an
|
|
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
|
|
* KIND, either express or implied. See the License for the
|
|
* specific language governing permissions and limitations
|
|
* under the License.
|
|
*/
|
|
#ifndef THRIFT_ASYNC_TUNFRAMEDASYNCCHANNEL_TCC_
|
|
#define THRIFT_ASYNC_TUNFRAMEDASYNCCHANNEL_TCC_ 1
|
|
|
|
#include "thrift/lib/cpp/async/TUnframedAsyncChannel.h"
|
|
|
|
#include "thrift/lib/cpp/transport/TBufferTransports.h"
|
|
|
|
namespace {
|
|
const uint32_t kInitialBufferSize = 4096;
|
|
}
|
|
|
|
namespace apache { namespace thrift { namespace async { namespace detail {
|
|
|
|
template<typename ProtocolTraits_>
|
|
TUnframedACReadState<ProtocolTraits_>::TUnframedACReadState()
|
|
: maxMessageSize_(0x7fffffff)
|
|
, memBuffer_(kInitialBufferSize)
|
|
, callbackBuffer_(NULL)
|
|
, protocolTraits_() {
|
|
}
|
|
|
|
template<typename ProtocolTraits_>
|
|
TUnframedACReadState<ProtocolTraits_>::~TUnframedACReadState() {
|
|
}
|
|
|
|
template<typename ProtocolTraits_>
|
|
void TUnframedACReadState<ProtocolTraits_>::getReadBuffer(void** bufReturn,
|
|
size_t* lenReturn) {
|
|
uint32_t bytesAvailable = memBuffer_.available_write();
|
|
if (bytesAvailable > 0) {
|
|
// If there is room available in the buffer, just return it.
|
|
*lenReturn = bytesAvailable;
|
|
*bufReturn = memBuffer_.getWritePtr(bytesAvailable);
|
|
return;
|
|
}
|
|
|
|
uint32_t bufferSize = memBuffer_.getBufferSize();
|
|
uint32_t available_read = memBuffer_.available_read();
|
|
// we get this much without growing the buffer capacity
|
|
uint32_t additionalSpace = bufferSize - available_read;
|
|
if (additionalSpace == 0) {
|
|
// We need more room. memBuffer_ will at least double it's capacity when
|
|
// asked for even a single byte.
|
|
additionalSpace = kInitialBufferSize;
|
|
}
|
|
|
|
// Don't allow more than maxMessageSize_.
|
|
// Be careful not to over- or underflow uint32_t when checking.
|
|
//
|
|
// readDataAvailable() fails the read when we've already read maxMessageSize_
|
|
// bytes, so available_read should always be less than maxMessageSize_ here.
|
|
// (Unless maxMessageSize_ is 0, but that's a programmer bug.)
|
|
assert(available_read < maxMessageSize_);
|
|
if (available_read > maxMessageSize_ - additionalSpace) {
|
|
// Don't ask for more than maxMessageSize_ total (but we might get more)
|
|
additionalSpace = maxMessageSize_ - available_read;
|
|
}
|
|
|
|
try {
|
|
uint8_t* newBuffer = memBuffer_.getWritePtr(additionalSpace);
|
|
*lenReturn = memBuffer_.available_write();
|
|
*bufReturn = newBuffer;
|
|
} catch (std::exception &ex) {
|
|
T_ERROR("TUnframedAsyncChannel: failed to allocate larger read buffer: %s",
|
|
ex.what());
|
|
*lenReturn = 0;
|
|
*bufReturn = NULL;
|
|
}
|
|
}
|
|
|
|
template<typename ProtocolTraits_>
|
|
bool TUnframedACReadState<ProtocolTraits_>::readDataAvailable(size_t len) {
|
|
assert(memBuffer_.available_read() + len <= memBuffer_.getBufferSize());
|
|
memBuffer_.wroteBytes(len);
|
|
|
|
uint32_t messageLength = 0;
|
|
uint32_t bytesRead = memBuffer_.available_read();
|
|
uint8_t *buffer = (uint8_t *)memBuffer_.borrow(NULL, &bytesRead);
|
|
if (!protocolTraits_.getMessageLength(buffer, bytesRead, &messageLength)) {
|
|
// We're not at the end of the message yet.
|
|
//
|
|
// If we've hit maxMessageSize_ already, fail now instead of waiting until
|
|
// getReadBuffer() is called again.
|
|
if (bytesRead >= maxMessageSize_) {
|
|
throw transport::TTransportException(
|
|
transport::TTransportException::CORRUPTED_DATA,
|
|
"TUnframedAsyncChannel: max message size exceeded");
|
|
}
|
|
return false;
|
|
}
|
|
|
|
// We've read a full message.
|
|
// Swap the data into the callback's buffer.
|
|
// Note that we may have actually read more than one message,
|
|
// so we have to make sure to save any remaining data after the end of the
|
|
// message.
|
|
assert(messageLength <= bytesRead);
|
|
|
|
callbackBuffer_->link(&memBuffer_, messageLength);
|
|
memBuffer_.consume(messageLength);
|
|
|
|
// We've put a new message in callbackBuffer_
|
|
return true;
|
|
}
|
|
|
|
}}}} // apache::thrift::async::detail
|
|
|
|
#endif // THRIFT_ASYNC_TUNFRAMEDASYNCCHANNEL_TCC_
|