src/lib/storage/vfs/cpp/node_connection.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 "src/lib/storage/vfs/cpp/node_connection.h"

#include <fcntl.h>
#include <fidl/fuchsia.io/cpp/wire.h>
#include <lib/fdio/io.h>
#include <lib/fdio/vfs.h>
#include <lib/zx/handle.h>
#include <limits.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <zircon/assert.h>

#include <memory>
#include <type_traits>
#include <utility>

#include <fbl/string_buffer.h>

#include "src/lib/storage/vfs/cpp/debug.h"
#include "src/lib/storage/vfs/cpp/fidl_transaction.h"
#include "src/lib/storage/vfs/cpp/vfs_types.h"
#include "src/lib/storage/vfs/cpp/vnode.h"

namespace fio = fuchsia_io;

namespace fs {

namespace internal {

NodeConnection::NodeConnection(fs::FuchsiaVfs* vfs, fbl::RefPtr<fs::Vnode> vnode,
                               VnodeProtocol protocol, VnodeConnectionOptions options)
    : Connection(vfs, std::move(vnode), protocol, options, FidlProtocol::Create<fio::Node>(this)) {}

void NodeConnection::Clone(CloneRequestView request, CloneCompleter::Sync& completer) {
  Connection::NodeClone(request->flags, std::move(request->object));
}

void NodeConnection::Close(CloseCompleter::Sync& completer) {
  zx::result result = Connection::NodeClose();
  if (result.is_error()) {
    completer.ReplyError(result.status_value());
  } else {
    completer.ReplySuccess();
  }
}

void NodeConnection::Query(QueryCompleter::Sync& completer) {
  if (options().flags.node_reference) {
    const std::string_view kProtocol = fio::wire::kNodeProtocolName;
    uint8_t* data = reinterpret_cast<uint8_t*>(const_cast<char*>(kProtocol.data()));
    completer.Reply(fidl::VectorView<uint8_t>::FromExternal(data, kProtocol.size()));
  } else {
    completer.Reply(Connection::NodeQuery());
  }
}

void NodeConnection::DescribeDeprecated(DescribeDeprecatedCompleter::Sync& completer) {
  zx::result result = Connection::NodeDescribe();
  if (result.is_error()) {
    completer.Close(result.status_value());
  } else {
    ConvertToIoV1NodeInfo(std::move(result).value(), [&](fio::wire::NodeInfoDeprecated&& info) {
      completer.Reply(std::move(info));
    });
  }
}

void NodeConnection::GetConnectionInfo(GetConnectionInfoCompleter::Sync& completer) {
  completer.Reply({});
}

void NodeConnection::Sync(SyncCompleter::Sync& completer) {
  Connection::NodeSync([completer = completer.ToAsync()](zx_status_t sync_status) mutable {
    if (sync_status != ZX_OK) {
      completer.ReplyError(sync_status);
    } else {
      completer.ReplySuccess();
    }
  });
}

void NodeConnection::GetAttr(GetAttrCompleter::Sync& completer) {
  auto result = Connection::NodeGetAttr();
  if (result.is_error()) {
    completer.Reply(result.status_value(), fio::wire::NodeAttributes());
  } else {
    completer.Reply(ZX_OK, result.value().ToIoV1NodeAttributes());
  }
}

void NodeConnection::SetAttr(SetAttrRequestView request, SetAttrCompleter::Sync& completer) {
  auto result = Connection::NodeSetAttr(request->flags, request->attributes);
  if (result.is_error()) {
    completer.Reply(result.status_value());
  } else {
    completer.Reply(ZX_OK);
  }
}

void NodeConnection::GetFlags(GetFlagsCompleter::Sync& completer) {
  auto result = Connection::NodeGetFlags();
  if (result.is_error()) {
    completer.Reply(result.status_value(), {});
  } else {
    completer.Reply(ZX_OK, result.value());
  }
}

void NodeConnection::SetFlags(SetFlagsRequestView request, SetFlagsCompleter::Sync& completer) {
  auto result = Connection::NodeSetFlags(request->flags);
  if (result.is_error()) {
    completer.Reply(result.status_value());
  } else {
    completer.Reply(ZX_OK);
  }
}

void NodeConnection::QueryFilesystem(QueryFilesystemCompleter::Sync& completer) {
  zx::result result = Connection::NodeQueryFilesystem();
  completer.Reply(result.status_value(),
                  result.is_ok() ? fidl::ObjectView<fuchsia_io::wire::FilesystemInfo>::FromExternal(
                                       &result.value())
                                 : nullptr);
}

}  // namespace internal

}  // namespace fs