zircon/system/ulib/fidl-async/llcpp_channel_transaction.cc

// Copyright 2019 The Fuchsia 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 <lib/fidl-async/cpp/bind.h>
#include <lib/fidl-async/cpp/channel_transaction.h>
#include <lib/fidl/epitaph.h>
#include <lib/fidl/llcpp/message.h>
#include <zircon/assert.h>

namespace fidl {

namespace internal {

void ChannelTransaction::Dispatch(fidl_incoming_msg_t msg) {
  binding_->interface_->dispatch_message(&msg, this);
}

zx_status_t ChannelTransaction::Reply(fidl::OutgoingMessage* message) {
  ZX_ASSERT(txid_ != 0);
  ZX_ASSERT(message->byte_actual() >= sizeof(fidl_message_header_t));
  auto hdr = reinterpret_cast<fidl_message_header_t*>(message->bytes());
  hdr->txid = txid_;
  txid_ = 0;
  message->Write(binding_->channel()->get());
  return message->status();
}

void ChannelTransaction::Close(zx_status_t epitaph) {
  // We need to make sure binding_ is present, since it may have been released
  // if Reply() called Close()
  if (binding_) {
    fidl_epitaph_write(binding_->channel()->get(), epitaph);
    binding_.reset();
  }
}

ChannelTransaction::~ChannelTransaction() {
  if (binding_) {
    BeginWait(&binding_);
  }
}

std::unique_ptr<Transaction> ChannelTransaction::TakeOwnership() {
  return std::make_unique<ChannelTransaction>(std::move(*this));
}

}  // namespace internal

}  // namespace fidl