// Copyright 2016, 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
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syntax = "proto3";

import "google/protobuf/timestamp.proto";

package grpc.binary_log.v1alpha;

enum Direction {
  SERVER_SEND = 0;
  SERVER_RECV = 1;
  CLIENT_SEND = 2;
  CLIENT_RECV = 3;
}

message KeyValuePair {
  string key = 1;
  string value = 2;
}

// Any sort of metadata that may be sent in either direction during a call
message Metadata {
  // Cryptographically unique identifier, generated on the client and sent
  // to the server.
  uint64 rpc_id = 1;
  // Timestamp of logging the metadata
  google.protobuf.Timestamp timestamp = 2;
  Direction direction = 3;
  // The actual metadata that is being sent
  repeated KeyValuePair metadata = 4;

  // Initial metadata sent by the client to initiate a request
  message ClientInitialMetadata {
    // The full method name that is being called
    string method_name = 1;
    // The call's deadline
    google.protobuf.Timestamp deadline = 2;
    // The address of the connected peer
    string peer = 3;
  }

  // Arbitrary key/value pairs specified by the user that are not sent over
  // the network but are nonetheless useful to log
  message UserData {
  }

  // Initial metadata response sent by the server after accepting the request
  message ServerInitialMetadata {
  }

  // Status sent by the server when closing the call on the server side
  message ServerStatus {
    // The status code
    uint32 code = 1;
    // The status details
    string details = 2;
  }

  oneof kind {
    ClientInitialMetadata client_initial_metadata = 5;
    UserData user_data = 6;
    ServerInitialMetadata server_initial_metadata = 7;
    ServerStatus server_status = 8;
  }
}

// A message that is sent during a call
message Message {
  // Cryptographically unique identifier, generated on the client and sent
  // to the server.
  uint64 rpc_id = 1;
  // The sequence number of the message. Messages sent by the client and by the
  // server should have independently incrementing sequence numbers.
  uint32 sequence_number = 2;
  Direction direction = 3;
  // The length of the complete message.
  uint32 length = 4;
  // The contents of the message. May be a prefix instead of the complete
  // message.
  bytes data = 5;
}
