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Signal

Signals are defined as Protobuf RPCs annotated with the temporal.v1.signal method option. They're mapped to workflows using the signal workflow option. See the Signals guide for more usage details.

warning

Signals definitions must use google.protobuf.Empty as their return value. This requires an additional google/protobuf/empty.proto protobuf import.

example.proto
syntax="proto3";

package example.v1;

import "google/protobuf/empty.proto";
import "temporal/v1/temporal.proto";

service Example {
  // Hello returns a friendly greeting
  rpc Hello(HelloInput) returns (HelloOutput) {
    option (temporal.v1.workflow) = {
      signal: { ref: 'Ping' }
    };
  }

  // Ping sends a signal to an existing workflow
  rpc Ping(PingInput) returns (google.protobuf.Empty) {
    option (temporal.v1.signal) = {};
  }
}

Options​

name​

string

Fully qualified Signal type name. Defaults to protobuf method full name (e.g. example.v1.Example.Ping)

service Example {
  rpc Ping(PingInput) returns (google.protobuf.Empty) {
    option (temporal.v1.signal) = {
      name: "Ping"
    };
  }
}

patches​

[]temporal.v1.Patch

Controls how a particular Patch is implemented in generated code, overriding any plugin or service-level configuration.

service Example {
  option (temporal.v1.service) = {
    patches: [
      { version: PV_64, mode: PV_MARKER },
    ]
  };

  rpc Example(ExampleInput) returns (ExampleOutput) {
    option (temporal.v1.signal) = {
      patches: [
        { version: PV_64, mode: PV_ENABLED }
      ]
    }
  }
}

xns​

temporal.v1.XNSActivityOptions

Used to configure cross-namespace activity options.

note

This requires the enable-xns plugin option to be enabled.

service Example {
  rpc Ping(PingInput) returns (google.protobuf.Empty) {
    option (temporal.v1.signal) = {
      xns: {
        heartbeat_timeout: { seconds: 30 }
        heartbeat_interval: { seconds: 10 }
        start_to_close_timeout: { seconds: 300 }
      }
    };
  }
}