feat(tfstated): implement GET and POST methods, states are encrypted in a sqlite3 database

pkg/database/migrations.go

@@ -0,0 +1,63 @@
+package database
+
+import (
+	"embed"
+	"io/fs"
+
+	_ "github.com/mattn/go-sqlite3"
+)
+
+//go:embed sql/*.sql
+var schemaFiles embed.FS
+
+func (db *DB) migrate() error {
+	statements := make([]string, 0)
+	err := fs.WalkDir(schemaFiles, ".", func(path string, d fs.DirEntry, err error) error {
+		if d.IsDir() || err != nil {
+			return err
+		}
+		var stmts []byte
+		if stmts, err = schemaFiles.ReadFile(path); err != nil {
+			return err
+		} else {
+			statements = append(statements, string(stmts))
+		}
+		return nil
+	})
+	if err != nil {
+		return err
+	}
+
+	tx, err := db.Begin()
+	if err != nil {
+		return err
+	}
+	defer func() {
+		if err != nil {
+			_ = tx.Rollback()
+		}
+	}()
+
+	var version int
+	if err = tx.QueryRowContext(db.ctx, `SELECT version FROM schema_version;`).Scan(&version); err != nil {
+		if err.Error() == "no such table: schema_version" {
+			version = 0
+		} else {
+			return err
+		}
+	}
+
+	for version < len(statements) {
+		if _, err = tx.ExecContext(db.ctx, statements[version]); err != nil {
+			return err
+		}
+		version++
+	}
+	if _, err = tx.ExecContext(db.ctx, `DELETE FROM schema_version; INSERT INTO schema_version (version) VALUES (?);`, version); err != nil {
+		return err
+	}
+	if err = tx.Commit(); err != nil {
+		return err
+	}
+	return nil
+}