feat: initial scaffold of agent_runner_api service Go :8486

db.go

@@ -0,0 +1,56 @@
+package main
+
+import (
+	"database/sql"
+	"embed"
+	"fmt"
+	"io/fs"
+	"sort"
+	"strings"
+
+	_ "github.com/mattn/go-sqlite3"
+)
+
+//go:embed migrations/*.sql
+var migrationsFS embed.FS
+
+// openDB opens (or creates) the SQLite database and applies migrations.
+func openDB(path string) (*sql.DB, error) {
+	dsn := fmt.Sprintf("file:%s?_journal=WAL&_foreign_keys=on&_busy_timeout=5000", path)
+	conn, err := sql.Open("sqlite3", dsn)
+	if err != nil {
+		return nil, fmt.Errorf("open: %w", err)
+	}
+	if err := conn.Ping(); err != nil {
+		return nil, fmt.Errorf("ping: %w", err)
+	}
+	if err := applyMigrations(conn); err != nil {
+		conn.Close()
+		return nil, fmt.Errorf("migrations: %w", err)
+	}
+	return conn, nil
+}
+
+func applyMigrations(conn *sql.DB) error {
+	files, err := fs.Glob(migrationsFS, "migrations/*.sql")
+	if err != nil {
+		return err
+	}
+	sort.Strings(files)
+	for _, f := range files {
+		b, err := migrationsFS.ReadFile(f)
+		if err != nil {
+			return err
+		}
+		if _, err := conn.Exec(string(b)); err != nil {
+			msg := err.Error()
+			// Idempotent ignores for ADD COLUMN re-runs etc.
+			if strings.Contains(msg, "duplicate column") ||
+				strings.Contains(msg, "already exists") {
+				continue
+			}
+			return fmt.Errorf("%s: %w", f, err)
+		}
+	}
+	return nil
+}