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How to send a Signal from a Temporal Client in Go

Use the SignalWorkflow() method on an instance of the Go SDK Temporal Client to send a Signal to a Workflow Execution.

Pass in both the Workflow Id and Run Id to uniquely identify the Workflow Execution. If only the Workflow Id is supplied (provide an empty string as the Run Id param), the Workflow Execution that is Running receives the Signal.

// ...
signal := MySignal {
  Message: "Some important data",
}
err = temporalClient.SignalWorkflow(context.Background(), "your-workflow-id", runID, "your-signal-name", signal)
if err != nil {
    log.Fatalln("Error sending the Signal", err)
    return
}
// ...

Possible errors:

  • serviceerror.NotFound
  • serviceerror.Internal
  • serviceerror.Unavailable