How to send a Signal from a Workflow in Go

A Signal can be sent from within a Workflow to a different Workflow Execution using the SignalExternalWorkflow API from the go.temporal.io/sdk/workflow package.

// ...
func YourWorkflowDefinition(ctx workflow.Context, param YourWorkflowParam) error {
  //...
  signal := MySignal {
    Message: "Some important data",
  }
  err :=  workflow.SignalExternalWorkflow(ctx, "some-workflow-id", "", "your-signal-name", signal).Get(ctx, nil)
  if err != nil {
    // ...
  }
// ...
}