feat: add bounded task priority and fair application dispatch

2026-09-17 18:45:54 +08:00
parent 958b4a8cea
commit 309ed75666
42 changed files with 1277 additions and 61 deletions
--- a/sdk/go/examples/priority/main.go
+++ b/sdk/go/examples/priority/main.go
@@ -0,0 +1,116 @@
+// priority 演示近同时到期任务的优先级顺序，真实受理与执行由 Orbit 完成。
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"os"
+	"time"
+
+	orbit "git.yuntuo.hk/k2safe/orbit/sdk/go"
+)
+
+func main() {
+	if err := run(); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}
+func run() error {
+	token := os.Getenv("ORBIT_TOKEN")
+	if path := os.Getenv("ORBIT_CREDENTIALS_FILE"); path != "" && token == "" {
+		raw, err := os.ReadFile(path)
+		if err != nil {
+			return err
+		}
+		var c struct {
+			Token string `json:"token"`
+		}
+		if err = json.Unmarshal(raw, &c); err != nil {
+			return err
+		}
+		token = c.Token
+	}
+	api, err := orbit.NewClient(os.Getenv("ORBIT_URL"), orbit.Options{Token: token})
+	if err != nil {
+		return err
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), 25*time.Second)
+	defer cancel()
+	op, err := orbit.NewWorkerMessageID()
+	if err != nil {
+		return err
+	}
+	name := "priority." + op
+	created, err := api.CreateQueue(ctx, "queue-"+op, orbit.CreateQueueRequest{Name: name, MaxConcurrency: 1, RatePerSecond: 100, MaxUnfinishedTasks: 3})
+	if err != nil {
+		return err
+	}
+	var tasks []orbit.Task
+	for _, priority := range []int16{0, 9, 4} {
+		in := orbit.SubmitTaskRequest{QueueID: created.Queue.ID, Handler: name, HandlerVersion: "v1", PayloadVersion: "v1", Payload: json.RawMessage(`{"object_ref":"objects/example","n":9007199254740993}`), Priority: priority, TaskTimeoutMS: 20000, Retry: orbit.RetryPolicy{MaxAttempts: 1, AttemptTimeoutMS: 10000}}
+		out, err := api.SubmitTask(ctx, fmt.Sprintf("task-%s-%d", op, priority), in)
+		if err != nil {
+			return err
+		}
+		tasks = append(tasks, out.Task)
+	}
+	order := make(chan int16, 3)
+	w, err := orbit.NewWorker(api, orbit.WorkerOptions{QueueID: created.Queue.ID, Capacity: 1, ShutdownTimeout: 5 * time.Second, Handlers: []orbit.WorkerHandler{{Capability: orbit.WorkerCapability{Handler: name, HandlerVersion: "v1", PayloadVersion: "v1"}, Handle: func(ctx context.Context, e orbit.WorkerExecution) (json.RawMessage, error) {
+		if err := ctx.Err(); err != nil {
+			return nil, err
+		}
+		order <- e.Task.Priority
+		return e.Task.Payload, nil
+	}}}})
+	if err != nil {
+		return err
+	}
+	run, stop := context.WithCancel(ctx)
+	done := make(chan error, 1)
+	go func() { done <- w.Run(run) }()
+	waited := false
+	defer func() {
+		stop()
+		if !waited {
+			<-done
+		}
+	}()
+	for _, task := range tasks {
+		for {
+			v, err := api.GetTask(ctx, task.ID)
+			if err != nil {
+				return err
+			}
+			if v.State == orbit.TaskSucceeded {
+				if v.Priority != task.Priority || v.AttemptCount != 1 {
+					return errors.New("frozen priority or execution count changed")
+				}
+				break
+			}
+			if v.State == orbit.TaskFailed || v.State == orbit.TaskNeedsReview || v.State == orbit.TaskCancelled {
+				return fmt.Errorf("unexpected task state: %s", v.State)
+			}
+			select {
+			case <-ctx.Done():
+				return ctx.Err()
+			case <-time.After(80 * time.Millisecond):
+			}
+		}
+	}
+	got := []int16{<-order, <-order, <-order}
+	if got[0] != 9 || got[1] != 4 || got[2] != 0 {
+		return fmt.Errorf("unexpected dispatch order: %v", got)
+	}
+	stop()
+	err = <-done
+	waited = true
+	if err != nil {
+		return err
+	}
+	fmt.Println("submitted_priorities=0,9,4 executed_priorities=9,4,0")
+	fmt.Println("completed=3 attempts_per_task=1 worker_drained=true")
+	return nil
+}