WIP/init

repo.go

@@ -0,0 +1,119 @@
+package outbox
+
+import (
+	"context"
+	"database/sql"
+	"encoding/json"
+	"errors"
+	"time"
+)
+
+var (
+	ErrSerialize = errors.New("error serialize/deserialize")
+	ErrInsert    = errors.New("error create")
+	ErrNotFound  = errors.New("not found")
+	ErrRead      = errors.New("error read")
+	ErrUpdate    = errors.New("error update")
+	ErrDelete    = errors.New("error delete")
+)
+
+func OpenOrCreate[T any](ctx context.Context, db *sql.DB, tablename string) (*Repo[T], error) {
+	if err := initDB(ctx, db, tablename); err != nil {
+		return nil, err
+	}
+
+	return &Repo[T]{
+		db:    db,
+		table: tablename,
+	}, nil
+}
+
+type Repo[T any] struct {
+	db    *sql.DB
+	table string
+}
+
+func (r *Repo[T]) CreateOrUpdate(ctx context.Context, id string, v *T) error {
+	now := time.Now()
+
+	stmt := "INSERT INTO $1 (id, created_at, updated_at, payload) VALUES ($2, $3, $4)"
+
+	b, err := serialize(v)
+	if err != nil {
+		return err
+	}
+
+	if _, err := r.db.ExecContext(ctx, stmt, r.table, id, now, now, b); err != nil {
+		return errors.Join(ErrInsert, err)
+	}
+
+	return nil
+}
+
+func (r *Repo[T]) Read(ctx context.Context, id string) (*T, error) {
+	stmt := "SELECT payload FROM $1 WHERE id = $2 AND deleted_at is NULL"
+
+	row, err := r.db.QueryContext(ctx, stmt, r.table, id)
+	if err != nil {
+		// TODO err not found
+		return nil, errors.Join(ErrRead, err)
+	}
+
+	b := []byte{}
+	if err := row.Scan(&b); err != nil {
+		return nil, err
+	}
+
+	v, err := deserialize[T](b)
+	if err != nil {
+		return nil, err
+	}
+
+	return v, nil
+}
+
+func (r *Repo[T]) Update(ctx context.Context, id string, v *T) error {
+	now := time.Now()
+	stmt := "UPDATE $1 SET updated_at = $3, payload = $4 WHERE id = $2"
+
+	b, err := json.Marshal(v)
+	if err != nil {
+		return errors.Join(ErrSerialize, err)
+	}
+
+	if _, err := r.db.ExecContext(ctx, stmt, r.table, id, now, b); err != nil {
+		return errors.Join(ErrUpdate, err)
+	}
+
+	return nil
+}
+
+func (r *Repo[T]) Delete(ctx context.Context, id string) error {
+	now := time.Now()
+
+	stmt := "UPDATE $1 SET deleted_at = $3 WHERE id = $2"
+
+	if _, err := r.db.ExecContext(ctx, stmt, r.table, now, id); err != nil {
+		return errors.Join(ErrDelete, err)
+	}
+
+	return nil
+}
+
+func serialize(v any) ([]byte, error) {
+	b, err := json.Marshal(v)
+	if err != nil {
+		return nil, errors.Join(ErrSerialize, err)
+	}
+
+	return b, nil
+}
+
+func deserialize[T any](b []byte) (*T, error) {
+	v := new(T)
+	if err := json.Unmarshal(b, v); err != nil {
+		return nil, errors.Join(ErrSerialize, err)
+	}
+
+	return v, nil
+}