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workflow.go
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workflow.go
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package cancellation
import (
"context"
"errors"
"time"
"go.temporal.io/sdk/activity"
"go.temporal.io/sdk/workflow"
)
func MyWorkflow(ctx workflow.Context) error {
ctx = workflow.WithActivityOptions(ctx, workflow.ActivityOptions{
StartToCloseTimeout: 30 * time.Minute,
HeartbeatTimeout: 5 * time.Second,
WaitForCancellation: true,
})
log := workflow.GetLogger(ctx)
log.Info("Cancel workflow started")
// Used to call activities by function pointer
var a *Activities
defer func() {
if !errors.Is(ctx.Err(), workflow.ErrCanceled) {
return
}
// When the workflow is canceled, it has to get a new disconnected context
newCtx, _ := workflow.NewDisconnectedContext(ctx)
err := workflow.ExecuteActivity(newCtx, a.CleanupActivity).Get(ctx, nil)
if err != nil {
log.Error("CleanupActivity failed", "Error", err)
}
}()
var result string
err := workflow.ExecuteActivity(ctx, a.ActivityToBeCanceled).Get(ctx, &result)
log.Info("ActivityToBeCanceled returned", "Result", result, "Error", result, err)
err = workflow.ExecuteActivity(ctx, a.ActivityToBeSkipped).Get(ctx, nil)
log.Error("Error from ActivityToBeSkipped", "Error", err)
log.Info("Workflow Execution complete")
return nil
}
type Activities struct{}
func (a *Activities) ActivityToBeCanceled(ctx context.Context) (string, error) {
logger := activity.GetLogger(ctx)
logger.Info("activity started")
for {
select {
case <-time.After(1 * time.Second):
logger.Info("heartbeating...")
activity.RecordHeartbeat(ctx, "")
case <-ctx.Done():
logger.Info("context is cancelled")
return "I am canceled by Done", nil
}
}
}
func (a *Activities) CleanupActivity(ctx context.Context) error {
logger := activity.GetLogger(ctx)
logger.Info("Cleanup Activity started")
return nil
}
func (a *Activities) ActivityToBeSkipped(ctx context.Context) error {
logger := activity.GetLogger(ctx)
logger.Info("this Activity will be skipped due to cancellation")
return nil
}