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# Copyright 2020 The Pigweed Authors
#
# Licensed 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
#
# https://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.
"""Functions for working with pw_rpc packets."""
from typing import Optional
from google.protobuf import message
from pw_status import Status
from pw_rpc.internal import packet_pb2
def decode(data: bytes) -> packet_pb2.RpcPacket:
packet = packet_pb2.RpcPacket()
packet.MergeFromString(data)
return packet
def decode_payload(packet, payload_type):
payload = payload_type()
payload.MergeFromString(packet.payload)
return payload
def _ids(rpc: tuple) -> tuple:
return tuple(item if isinstance(item, int) else item.id for item in rpc)
def encode_request(rpc: tuple, request: Optional[message.Message]) -> bytes:
channel, service, method = _ids(rpc)
payload = request.SerializeToString() if request is not None else bytes()
return packet_pb2.RpcPacket(
type=packet_pb2.PacketType.REQUEST,
channel_id=channel,
service_id=service,
method_id=method,
payload=payload,
).SerializeToString()
def encode_response(rpc: tuple, response: message.Message) -> bytes:
channel, service, method = _ids(rpc)
return packet_pb2.RpcPacket(
type=packet_pb2.PacketType.RESPONSE,
channel_id=channel,
service_id=service,
method_id=method,
payload=response.SerializeToString(),
).SerializeToString()
def encode_client_stream(rpc: tuple, request: message.Message) -> bytes:
channel, service, method = _ids(rpc)
return packet_pb2.RpcPacket(
type=packet_pb2.PacketType.CLIENT_STREAM,
channel_id=channel,
service_id=service,
method_id=method,
payload=request.SerializeToString(),
).SerializeToString()
def encode_client_error(packet: packet_pb2.RpcPacket, status: Status) -> bytes:
return packet_pb2.RpcPacket(
type=packet_pb2.PacketType.CLIENT_ERROR,
channel_id=packet.channel_id,
service_id=packet.service_id,
method_id=packet.method_id,
status=status.value,
).SerializeToString()
def encode_cancel(rpc: tuple) -> bytes:
channel, service, method = _ids(rpc)
return packet_pb2.RpcPacket(
type=packet_pb2.PacketType.CLIENT_ERROR,
status=Status.CANCELLED.value,
channel_id=channel,
service_id=service,
method_id=method,
).SerializeToString()
def encode_client_stream_end(rpc: tuple) -> bytes:
channel, service, method = _ids(rpc)
return packet_pb2.RpcPacket(
type=packet_pb2.PacketType.CLIENT_STREAM_END,
channel_id=channel,
service_id=service,
method_id=method,
).SerializeToString()
def for_server(packet: packet_pb2.RpcPacket) -> bool:
return packet.type % 2 == 0
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