feat: add reusable MySQL outbox and HTTP lifecycle example

examples/http-service/internal/jobs/store.go

@@ -0,0 +1,126 @@
+// Package outbox 演示在业务事务中使用公共 MySQL Outbox 适配包。
+package jobs
+
+import (
+	"context"
+	"database/sql"
+	_ "embed"
+	"encoding/json"
+	"errors"
+	"strings"
+	"unicode"
+	"unicode/utf8"
+
+	adapter "git.yuntuo.hk/k2safe/orbit/adapters/outbox/mysql"
+	orbit "git.yuntuo.hk/k2safe/orbit/sdk/go"
+)
+
+//go:embed schema.sql
+var schema string
+var (
+	ErrInvalid           = adapter.ErrInvalid
+	ErrStorage           = adapter.ErrStorage
+	ErrConflict          = adapter.ErrConflict
+	ErrCommitUnconfirmed = adapter.ErrCommitUnconfirmed
+	ErrIdle              = adapter.ErrIdle
+)
+
+type Record = adapter.Record
+
+// Store 仅补充示例业务事务；发送、查询、租约由公共包负责。
+type Store struct {
+	*adapter.Store
+	db        *sql.DB
+	namespace string
+}
+
+var Open = adapter.Open
+
+func Init(ctx context.Context, db *sql.DB) error {
+	if err := adapter.Init(ctx, db); err != nil {
+		return err
+	}
+	if _, err := db.ExecContext(ctx, schema); err != nil {
+		return ErrStorage
+	}
+	return nil
+}
+func New(db *sql.DB, namespace, queue string) (*Store, error) {
+	s, err := adapter.New(db, namespace, queue, adapter.Options{OnAccepted: accepted})
+	if err != nil {
+		return nil, err
+	}
+	return &Store{s, db, namespace}, nil
+}
+func accepted(ctx context.Context, tx *sql.Tx, r adapter.Record, receipt orbit.SubmitTaskResult) error {
+	var existing *string
+	if err := tx.QueryRowContext(ctx, `SELECT task_id FROM sender_jobs WHERE namespace_id=? AND operation_id=? FOR UPDATE`, r.NamespaceID, r.OperationID).Scan(&existing); err != nil {
+		return ErrStorage
+	}
+	if existing != nil && *existing != receipt.Task.ID {
+		return ErrConflict
+	}
+	_, err := tx.ExecContext(ctx, `UPDATE sender_jobs SET task_id=?,updated_at=UTC_TIMESTAMP(6) WHERE namespace_id=? AND operation_id=?`, receipt.Task.ID, r.NamespaceID, r.OperationID)
+	if err != nil {
+		return ErrStorage
+	}
+	return nil
+}
+func (s *Store) Enqueue(ctx context.Context, id, source string, in orbit.SubmitTaskRequest) (bool, error) {
+	if !utf8.ValidString(source) || strings.TrimSpace(source) == "" || utf8.RuneCountInString(source) > 512 || strings.ContainsFunc(source, unicode.IsControl) {
+		return false, ErrInvalid
+	}
+	tx, err := s.db.BeginTx(ctx, &sql.TxOptions{Isolation: sql.LevelReadCommitted})
+	if err != nil {
+		return false, ErrStorage
+	}
+	defer tx.Rollback()
+	duplicate, err := s.Store.EnqueueTx(ctx, tx, id, in)
+	if err != nil {
+		return false, err
+	}
+	if duplicate {
+		var saved string
+		if err = tx.QueryRowContext(ctx, `SELECT source_ref FROM sender_jobs WHERE namespace_id=? AND operation_id=? FOR UPDATE`, s.namespace, id).Scan(&saved); err != nil {
+			return false, ErrStorage
+		}
+		if saved != source {
+			return false, ErrConflict
+		}
+	} else {
+		if _, err = tx.ExecContext(ctx, `INSERT INTO sender_jobs(namespace_id,operation_id,source_ref,created_at,updated_at) VALUES(?,?,?,UTC_TIMESTAMP(6),UTC_TIMESTAMP(6))`, s.namespace, id, source); err != nil {
+			return false, ErrStorage
+		}
+	}
+	if tx.Commit() != nil {
+		return false, ErrCommitUnconfirmed
+	}
+	return duplicate, nil
+}
+
+// View 是业务HTTP的读取结果；Submission只表示提交阶段，Execution来自持久化Inbox。
+type View struct {
+	OperationID string          `json:"operation_id"`        // OperationID 调用方提供的稳定操作标识。
+	Submission  string          `json:"submission"`          // Submission 待发/发送中/已受理/需核查，不是执行结果。
+	Code        string          `json:"code"`                // Code 最近稳定的提交分类。
+	TaskID      *string         `json:"task_id,omitempty"`   // TaskID 已核对的平台任务，未确认时为空。
+	Execution   string          `json:"execution,omitempty"` // Execution 业务Inbox最后收到的任务状态。
+	Result      json.RawMessage `json:"result,omitempty"`    // Result 业务Inbox中的结果，尚未到达时为空。
+}
+
+func (s *Store) View(ctx context.Context, id string) (View, error) {
+	r, err := s.Status(ctx, id)
+	if err != nil {
+		return View{}, err
+	}
+	v := View{OperationID: id, Submission: r.State, Code: r.LastCode, TaskID: r.TaskID}
+	if r.TaskID != nil {
+		var result []byte
+		err = s.db.QueryRowContext(ctx, `SELECT last_state,result_json FROM receiver_task_views WHERE consumer_name='http-service' AND queue_id=? AND task_id=?`, r.QueueID, *r.TaskID).Scan(&v.Execution, &result)
+		if err != nil && !errors.Is(err, sql.ErrNoRows) {
+			return View{}, ErrStorage
+		}
+		v.Result = result
+	}
+	return v, nil
+}