server.proto

// This package defines protocol for use with cloudprober's external
// probe (in server mode).
syntax = "proto2";

package cloudprober;

// ProbeRequest is the message that cloudprober sends to the external probe
// server.
message ProbeRequest {
  // The unique identifier for this request.  This is unique across
  // an execution of the probe server.  It starts at 1.
  required int32 request_id = 1;

  // How long to allow for the execution of this request, in
  // milliseconds.  If the time limit is exceeded, the server
  // should abort the request, but *not* send back a reply.  The
  // client will have to do timeouts anyway.
  required int32 time_limit = 2;

  message Option {
    required string name = 1;
    required string value = 2;
  }
  repeated Option options = 3;
};

// ProbeReply is the message that external probe server sends back to the
// cloudprober.
message ProbeReply {
  // The sequence number for this request.
  required int32 request_id = 1;

  // For a normal result, this is not present.
  // If it is present, it indicates that the probe failed.
  optional string error_message = 2;

  // The result of the probe. Cloudprober parses the payload to retrieve
  // variables from it. It expects variables in the following format:
  // var1 value1 (for example: total_errors 589)
  // TODO(manugarg): Add an option to export mapped variables, for example:
  // client-errors map:lang java:200 python:20 golang:3
  optional string payload = 3;
};