feat: implement task queue

4 files changed, 109 insertions, 0 deletions

diff --git a/backend/taskqueue/processor.go b/backend/taskqueue/processor.go
new file mode 100644
index 0000000..e26ac64
--- /dev/null
+++ b/backend/taskqueue/processor.go
@@ -0,0 +1,25 @@
+package taskqueue
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+
+	"github.com/hibiken/asynq"
+)
+
+type ExecProcessor struct {
+}
+
+func (processor *ExecProcessor) ProcessTask(ctx context.Context, t *asynq.Task) error {
+	var payload TaskExecPlayload
+	if err := json.Unmarshal(t.Payload(), &payload); err != nil {
+		return fmt.Errorf("json.Unmarshal failed: %v: %w", err, asynq.SkipRetry)
+	}
+	// TODO
+	return nil
+}
+
+func NewExecProcessor() *ExecProcessor {
+	return &ExecProcessor{}
+}
diff --git a/backend/taskqueue/queue.go b/backend/taskqueue/queue.go
new file mode 100644
index 0000000..53ec6d6
--- /dev/null
+++ b/backend/taskqueue/queue.go
@@ -0,0 +1,25 @@
+package taskqueue
+
+import (
+	"github.com/hibiken/asynq"
+)
+
+type Queue struct {
+	client *asynq.Client
+}
+
+func NewQueue(redisAddr string) *Queue {
+	return &Queue{
+		client: asynq.NewClient(asynq.RedisClientOpt{
+			Addr: redisAddr,
+		}),
+	}
+}
+
+func (q *Queue) Close() {
+	q.client.Close()
+}
+
+func (q *Queue) Enqueue(task *asynq.Task, opts ...asynq.Option) (*asynq.TaskInfo, error) {
+	return q.client.Enqueue(task, opts...)
+}
diff --git a/backend/taskqueue/tasks.go b/backend/taskqueue/tasks.go
new file mode 100644
index 0000000..2891a36
--- /dev/null
+++ b/backend/taskqueue/tasks.go
@@ -0,0 +1,32 @@
+package taskqueue
+
+import (
+	"encoding/json"
+
+	"github.com/hibiken/asynq"
+)
+
+const (
+	TaskTypeExec = "exec"
+)
+
+type Testcase struct {
+	Stdin  string
+	Stdout string
+}
+
+type TaskExecPlayload struct {
+	Code      string
+	Testcases []*Testcase
+}
+
+func NewExecTask(code string, testcases []*Testcase) (*asynq.Task, error) {
+	payload, err := json.Marshal(TaskExecPlayload{
+		Code:      code,
+		Testcases: testcases,
+	})
+	if err != nil {
+		return nil, err
+	}
+	return asynq.NewTask(TaskTypeExec, payload), nil
+}
diff --git a/backend/taskqueue/worker_server.go b/backend/taskqueue/worker_server.go
new file mode 100644
index 0000000..9bdd81f
--- /dev/null
+++ b/backend/taskqueue/worker_server.go
@@ -0,0 +1,27 @@
+package taskqueue
+
+import (
+	"github.com/hibiken/asynq"
+)
+
+type WorkerServer struct {
+	server *asynq.Server
+}
+
+func NewWorkerServer(redisAddr string) *WorkerServer {
+	return &WorkerServer{
+		server: asynq.NewServer(
+			asynq.RedisClientOpt{
+				Addr: redisAddr,
+			},
+			asynq.Config{},
+		),
+	}
+}
+
+func (s *WorkerServer) Run() error {
+	mux := asynq.NewServeMux()
+	mux.Handle(TaskTypeExec, NewExecProcessor())
+
+	return s.server.Run(mux)
+}