feat: add reusable MySQL outbox and HTTP lifecycle example

adapters/outbox/mysql/business_fixture_test.go

@@ -0,0 +1,60 @@
+package outbox
+
+import (
+	"context"
+	"database/sql"
+	"strings"
+	"unicode"
+	"unicode/utf8"
+
+	orbit "git.yuntuo.hk/k2safe/orbit/sdk/go"
+)
+
+func businessStore(db *sql.DB, namespace, queue string) (*Store, error) {
+	return New(db, namespace, queue, Options{OnAccepted: accepted})
+}
+func accepted(ctx context.Context, tx *sql.Tx, r 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.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
+}