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/*
*
* Copyright 2015, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include "src/cpp/proto/proto_utils.h"
#include <grpc++/config.h>
#include <grpc/grpc.h>
#include <grpc/byte_buffer.h>
#include <grpc/support/slice.h>
#include <grpc/support/slice_buffer.h>
#include <grpc/support/port_platform.h>
const int kMaxBufferLength = 8192;
class GrpcBufferWriter GRPC_FINAL
: public ::grpc::protobuf::io::ZeroCopyOutputStream {
public:
explicit GrpcBufferWriter(grpc_byte_buffer** bp,
int block_size = kMaxBufferLength)
: block_size_(block_size), byte_count_(0), have_backup_(false) {
*bp = grpc_byte_buffer_create(NULL, 0);
slice_buffer_ = &(*bp)->data.slice_buffer;
}
~GrpcBufferWriter() GRPC_OVERRIDE {
if (have_backup_) {
gpr_slice_unref(backup_slice_);
}
}
bool Next(void** data, int* size) GRPC_OVERRIDE {
if (have_backup_) {
slice_ = backup_slice_;
have_backup_ = false;
} else {
slice_ = gpr_slice_malloc(block_size_);
}
*data = GPR_SLICE_START_PTR(slice_);
byte_count_ += *size = GPR_SLICE_LENGTH(slice_);
gpr_slice_buffer_add(slice_buffer_, slice_);
return true;
}
void BackUp(int count) GRPC_OVERRIDE {
gpr_slice_buffer_pop(slice_buffer_);
if (count == block_size_) {
backup_slice_ = slice_;
} else {
backup_slice_ =
gpr_slice_split_tail(&slice_, GPR_SLICE_LENGTH(slice_) - count);
gpr_slice_buffer_add(slice_buffer_, slice_);
}
have_backup_ = true;
byte_count_ -= count;
}
grpc::protobuf::int64 ByteCount() const GRPC_OVERRIDE { return byte_count_; }
private:
const int block_size_;
gpr_int64 byte_count_;
gpr_slice_buffer* slice_buffer_;
bool have_backup_;
gpr_slice backup_slice_;
gpr_slice slice_;
};
class GrpcBufferReader GRPC_FINAL
: public ::grpc::protobuf::io::ZeroCopyInputStream {
public:
explicit GrpcBufferReader(grpc_byte_buffer* buffer)
: byte_count_(0), backup_count_(0) {
reader_ = grpc_byte_buffer_reader_create(buffer);
}
~GrpcBufferReader() GRPC_OVERRIDE {
grpc_byte_buffer_reader_destroy(reader_);
}
bool Next(const void** data, int* size) GRPC_OVERRIDE {
if (backup_count_ > 0) {
*data = GPR_SLICE_START_PTR(slice_) + GPR_SLICE_LENGTH(slice_) -
backup_count_;
*size = backup_count_;
backup_count_ = 0;
return true;
}
if (!grpc_byte_buffer_reader_next(reader_, &slice_)) {
return false;
}
gpr_slice_unref(slice_);
*data = GPR_SLICE_START_PTR(slice_);
byte_count_ += *size = GPR_SLICE_LENGTH(slice_);
return true;
}
void BackUp(int count) GRPC_OVERRIDE { backup_count_ = count; }
bool Skip(int count) GRPC_OVERRIDE {
const void* data;
int size;
while (Next(&data, &size)) {
if (size >= count) {
BackUp(size - count);
return true;
}
// size < count;
count -= size;
}
// error or we have too large count;
return false;
}
grpc::protobuf::int64 ByteCount() const GRPC_OVERRIDE {
return byte_count_ - backup_count_;
}
private:
gpr_int64 byte_count_;
gpr_int64 backup_count_;
grpc_byte_buffer_reader* reader_;
gpr_slice slice_;
};
namespace grpc {
bool SerializeProto(const grpc::protobuf::Message& msg, grpc_byte_buffer** bp) {
GrpcBufferWriter writer(bp);
return msg.SerializeToZeroCopyStream(&writer);
}
bool DeserializeProto(grpc_byte_buffer* buffer, grpc::protobuf::Message* msg) {
if (!buffer) return false;
GrpcBufferReader reader(buffer);
return msg->ParseFromZeroCopyStream(&reader);
}
} // namespace grpc
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