// Copyright 2022 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.
syntax = "proto3";

package pw.transfer;

option java_package = "pw.transfer";
option java_outer_classname = "ConfigProtos";

// Configuration for the integration test client.
message ClientConfig {
  // Transfer resource ID to use.
  uint32 resource_id = 1;

  // Path to the file containing the data to write to the server.
  string file = 2;

  // The maximum number of times a packet will attempt to be sent before the
  // transfer aborts due to a lack of response.
  uint32 max_retries = 3;

  // The maximum time to wait for a response to the first packet sent to the
  // pw_transfer server before attempting to retry. Extending this can help
  // work around cases where transfer initialization takes a long time.
  //
  // Note: This parameter is only supported on Java transfer clients.
  // TODO(tpudlik): google.protobuf.Duration?
  uint32 initial_chunk_timeout_ms = 4;

  // The maximum time to wait for a response to a sent packet before attempting
  // to re-send the packet.
  //
  // TODO(tpudlik): google.protobuf.Duration?
  uint32 chunk_timeout_ms = 5;
}

// Configuration for the integration test server.
message ServerConfig {
  // Transfer ID to use.
  uint32 resource_id = 1;
  // Path to the file to which the server should write out data it receives from
  // the client.
  string file = 2;
  // Size of the chunk buffer used by the transfer thread, in bytes.
  uint32 chunk_size_bytes = 3;
  // Window size, in bytes.
  uint32 pending_bytes = 4;
  // TODO(tpudlik): google.protobuf.Duration?
  uint32 chunk_timeout_seconds = 5;
  uint32 transfer_service_retries = 6;
  uint32 extend_window_divisor = 7;
}

// Configuration for the HdlcPacketizer proxy filter.
message HdlcPacketizerConfig {}

// Configuration for the DataDropper proxy filter.
message DataDropperConfig {
  // Rate at which to drop data
  float rate = 1;

  // Seed to use for the rand number generator used for determining
  // when data is dropped.
  int64 seed = 2;
}

// Configuration for the RateLimiter proxy filter.
message RateLimiterConfig {
  // Rate limit, in bytes/sec.
  float rate = 1;
}

// Configuration for the DataTransposer proxy filter.
message DataTransposerConfig {
  // Rate at which to transpose data.  Probability of transposition
  // between 0.0 and 1.0.
  float rate = 1;

  // Maximum time a chunk of data will be held for Transposition.  After this
  // time has elapsed, the packet is sent in order.
  float timeout = 2;

  // Seed to use for the rand number generator used for determining
  // when data is transposed.
  int64 seed = 3;
}

// Configuration for a single stage in the proxy filter stack.
message FilterConfig {
  oneof filter {
    HdlcPacketizerConfig hdlc_packetizer = 1;
    DataDropperConfig data_dropper = 2;
    RateLimiterConfig rate_limiter = 3;
    DataTransposerConfig data_transposer = 4;
  }
}

message ProxyConfig {
  // Filters are listed in order of execution.  I.e. the first filter listed
  // will get the received data first then pass it on the the second listed
  // filter. That process repeats until the last filter send the data to the
  // other side of the proxy.
  repeated FilterConfig client_filter_stack = 1;
  repeated FilterConfig server_filter_stack = 2;
}