// Copyright 2014 Cloudera, Inc.
//
// 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
//
//     http://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.
package kudu.server;

option java_package = "org.kududb.server";

import "kudu/common/common.proto";
import "kudu/common/wire_protocol.proto";
import "kudu/util/version_info.proto";

// The status information dumped by a server after it starts.
//
// This is optionally exposed on the local host in a text file which the server writes out
// at startup.
//
// Additionally, it is exposed via RPC through the GenericService interface.
message ServerStatusPB {
  required NodeInstancePB node_instance = 1;
  repeated HostPortPB bound_rpc_addresses = 2;
  repeated HostPortPB bound_http_addresses = 3;
  optional VersionInfoPB version_info = 4;
}

// Attempt to set a command line flag.
// Note that many command line flags do not take effect if changed
// at runtime.
//
// TODO: We plan to add tags indicating which flags can be modified at
// runtime. For now, this is an advanced option.
message SetFlagRequestPB {
  required string flag = 1;
  required string value = 2;

  // Force the change, even if the flag is not marked as safe to change
  // at runtime. This can cause crashes or other bad behavior, so should
  // only be used as a last resort.
  optional bool force = 3 [default = false];
}

message SetFlagResponsePB {
  enum Code {
    UNKNOWN = 0;
    SUCCESS = 1;
    NO_SUCH_FLAG = 2;
    BAD_VALUE = 3;

    // The flag is not safe to change at runtime without the 'force' flag.
    NOT_SAFE = 4;
  }

  required Code result = 1;

  // A string describing the new value that the option has been set to.
  // This passes through the return value of SetCommandLineOption() from
  // gflags, which doesn't specify anything about the format of this message.
  //
  // Using 'result' above is more reliable.
  optional string msg = 2;

  // If the flag exists, the prior value of the flag. This is set even in the
  // case of BAD_VALUE.
  optional string old_value = 3;
}

// Attempt to flush coverage information to disk, if running a coverage build.
message FlushCoverageRequestPB {
}
message FlushCoverageResponsePB {
  // If the current build is not a coverage build, returns false.
  optional bool success = 1;
}

// Requests the server's current timestamp.
message ServerClockRequestPB {
}
message ServerClockResponsePB {
  // The current timestamp of the server.
  optional fixed64 timestamp = 1;
}

// Requests the server's status and version info
message GetStatusRequestPB {
}
message GetStatusResponsePB {
  required ServerStatusPB status = 1;
}

service GenericService {
  rpc SetFlag(SetFlagRequestPB)
    returns (SetFlagResponsePB);

  rpc FlushCoverage(FlushCoverageRequestPB)
    returns (FlushCoverageResponsePB);

  rpc ServerClock(ServerClockRequestPB)
    returns (ServerClockResponsePB);

  rpc GetStatus(GetStatusRequestPB)
    returns (GetStatusResponsePB);
}