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subworkflow.go
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subworkflow.go
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package main
import (
"context"
"errors"
"fmt"
"log"
"time"
"github.com/cschleiden/go-workflows/backend"
"github.com/cschleiden/go-workflows/client"
"github.com/cschleiden/go-workflows/samples"
"github.com/cschleiden/go-workflows/worker"
"github.com/cschleiden/go-workflows/workflow"
"github.com/google/uuid"
)
func main() {
ctx, cancel := context.WithCancel(context.Background())
b := samples.GetBackend("subworkflow")
// Run worker
w := RunWorker(ctx, b)
// Start workflow via client
c := client.New(b)
startWorkflow(ctx, c)
cancel()
if err := w.WaitForCompletion(); err != nil {
panic("could not stop worker" + err.Error())
}
}
func startWorkflow(ctx context.Context, c *client.Client) {
wf, err := c.CreateWorkflowInstance(ctx, client.WorkflowInstanceOptions{
InstanceID: uuid.NewString(),
}, ParentWorkflow, "Hello world"+uuid.NewString())
if err != nil {
panic("could not start workflow")
}
log.Println("Started workflow", wf.InstanceID)
result, err := client.GetWorkflowResult[any](ctx, c, wf, time.Second*200)
if err != nil {
log.Fatal(err)
}
log.Println("Workflow finished. Result:", result)
}
func RunWorker(ctx context.Context, mb backend.Backend) *worker.Worker {
w := worker.New(mb, nil)
w.RegisterWorkflow(ParentWorkflow)
w.RegisterWorkflow(SubWorkflow)
w.RegisterActivity(Activity1)
w.RegisterActivity(Activity2)
if err := w.Start(ctx); err != nil {
panic("could not start worker")
}
return w
}
func ParentWorkflow(ctx workflow.Context, msg string) error {
logger := workflow.Logger(ctx)
logger.Debug("Entering Workflow1")
logger.Debug("\tWorkflow instance input:", "msg", msg)
wr := workflow.CreateSubWorkflowInstance[string](ctx, workflow.DefaultSubWorkflowOptions, SubWorkflow, "some input")
result, err := wr.Get(ctx)
if err != nil && !errors.Is(err, workflow.Canceled) {
return fmt.Errorf("getting sub workflow result: %w", err)
}
logger.Debug("Sub workflow result:", "result", result)
return nil
}
func SubWorkflow(ctx workflow.Context, msg string) (string, error) {
logger := workflow.Logger(ctx)
logger.Debug("Entering SubWorkflow", "msg", msg)
defer logger.Debug("Leaving SubWorkflow")
r1, err := workflow.ExecuteActivity[int](ctx, workflow.DefaultActivityOptions, Activity1, 35, 12).Get(ctx)
if err != nil {
logger.Error("error getting activity 1 result", "err", err)
}
logger.Debug("R1 result:", "r1", r1)
r2, err := workflow.ExecuteActivity[int](ctx, workflow.DefaultActivityOptions, Activity2).Get(ctx)
if err != nil {
logger.Error("error getting activity 2 result", "err", err)
}
logger.Debug("R2 result:", "r2", r2)
return "W2 Result", nil
}
func Activity1(ctx context.Context, a, b int) (int, error) {
log.Println("Entering Activity1")
defer log.Println("Leaving Activity1")
return a + b, nil
}
func Activity2(ctx context.Context) (int, error) {
log.Println("Entering Activity2")
defer log.Println("Leaving Activity2")
return 12, nil
}