mirror of
https://github.com/oarkflow/mq.git
synced 2025-10-04 07:37:05 +08:00
81 lines
2.4 KiB
Go
81 lines
2.4 KiB
Go
package main
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import (
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"context"
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"encoding/json"
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"fmt"
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"github.com/oarkflow/mq"
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"time"
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)
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func handleNode1(_ context.Context, task mq.Task) mq.Result {
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result := []map[string]string{
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{"field": "facility", "item": "item1"},
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{"field": "facility", "item": "item2"},
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{"field": "facility", "item": "item3"},
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}
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var payload string
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err := json.Unmarshal(task.Payload, &payload)
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if err != nil {
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return mq.Result{Status: "fail", Payload: json.RawMessage(`{"field": "node1", "item": "error"}`)}
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}
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fmt.Printf("Processing task at node1: %s\n", string(task.Payload))
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bt, _ := json.Marshal(result)
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return mq.Result{Status: "completed", Payload: bt}
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}
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func handleNode2(_ context.Context, task mq.Task) mq.Result {
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var payload map[string]string
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err := json.Unmarshal(task.Payload, &payload)
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if err != nil {
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return mq.Result{Status: "fail", Payload: json.RawMessage(`{"field": "node2", "item": "error"}`)}
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}
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status := "fail"
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if payload["item"] == "item2" {
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status = "pass"
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}
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fmt.Printf("Processing task at node2: %s %s\n", payload, status)
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bt, _ := json.Marshal(payload)
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return mq.Result{Status: status, Payload: bt}
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}
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func handleNode3(_ context.Context, task mq.Task) mq.Result {
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result := `{"field": "node3", "item": %s}`
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fmt.Printf("Processing task at node3: %s\n", string(task.Payload))
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return mq.Result{Status: "completed", Payload: json.RawMessage(fmt.Sprintf(result, string(task.Payload)))}
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}
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func handleNode4(_ context.Context, task mq.Task) mq.Result {
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result := `{"field": "node4", "item": %s}`
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fmt.Printf("Processing task at node4: %s\n", string(task.Payload))
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return mq.Result{Status: "completed", Payload: json.RawMessage(fmt.Sprintf(result, string(task.Payload)))}
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}
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func main() {
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ctx := context.Background()
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d := mq.NewDAG(":8082", false)
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d.AddNode("node1", handleNode1, true)
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d.AddNode("node2", handleNode2)
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d.AddNode("node3", handleNode3)
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d.AddNode("node4", handleNode4)
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d.AddCondition("node2", map[string]string{"pass": "node3", "fail": "node4"})
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err := d.AddLoop("node1", "node2")
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if err != nil {
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panic(err)
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}
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err = d.Prepare(ctx)
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if err != nil {
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panic(err)
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}
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// Start the DAG and process the task
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go func() {
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if err := d.Start(ctx); err != nil {
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fmt.Println("Error starting DAG:", err)
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}
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}()
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result := d.ProcessTask(ctx, mq.Task{Payload: []byte(`"Start processing"`)})
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fmt.Println(string(result.Payload))
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time.Sleep(50 * time.Second)
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}
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