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

pkg/database/db.go

@@ -0,0 +1,103 @@
+package database
+
+import (
+	"context"
+	"database/sql"
+	"runtime"
+
+	"git.adyxax.org/adyxax/tfstated/pkg/scrypto"
+)
+
+func initDB(ctx context.Context, url string) (*sql.DB, error) {
+	db, err := sql.Open("sqlite3", url)
+	if err != nil {
+		return nil, err
+	}
+	defer func() {
+		if err != nil {
+			_ = db.Close()
+		}
+	}()
+	if _, err = db.ExecContext(ctx, "PRAGMA busy_timeout = 5000"); err != nil {
+		return nil, err
+	}
+
+	return db, nil
+}
+
+type DB struct {
+	ctx               context.Context
+	dataEncryptionKey scrypto.AES256Key
+	readDB            *sql.DB
+	writeDB           *sql.DB
+}
+
+func NewDB(ctx context.Context, url string) (*DB, error) {
+	readDB, err := initDB(ctx, url)
+	if err != nil {
+		return nil, err
+	}
+	defer func() {
+		if err != nil {
+			_ = readDB.Close()
+		}
+	}()
+	readDB.SetMaxOpenConns(max(4, runtime.NumCPU()))
+
+	writeDB, err := initDB(ctx, url)
+	if err != nil {
+		return nil, err
+	}
+	defer func() {
+		if err != nil {
+			_ = writeDB.Close()
+		}
+	}()
+	writeDB.SetMaxOpenConns(1)
+
+	db := DB{
+		ctx:     ctx,
+		readDB:  readDB,
+		writeDB: writeDB,
+	}
+	if _, err = db.Exec("PRAGMA foreign_keys = ON"); err != nil {
+		return nil, err
+	}
+	if _, err = db.Exec("PRAGMA cache_size = 10000000"); err != nil {
+		return nil, err
+	}
+	if _, err = db.Exec("PRAGMA journal_mode = WAL"); err != nil {
+		return nil, err
+	}
+	if _, err = db.Exec("PRAGMA synchronous = NORMAL"); err != nil {
+		return nil, err
+	}
+	if err = db.migrate(); err != nil {
+		return nil, err
+	}
+
+	return &db, nil
+}
+
+func (db *DB) Begin() (*sql.Tx, error) {
+	return db.writeDB.Begin()
+}
+
+func (db *DB) Close() error {
+	if err := db.readDB.Close(); err != nil {
+		_ = db.writeDB.Close()
+	}
+	return db.writeDB.Close()
+}
+
+func (db *DB) Exec(query string, args ...any) (sql.Result, error) {
+	return db.writeDB.ExecContext(db.ctx, query, args...)
+}
+
+func (db *DB) QueryRow(query string, args ...any) *sql.Row {
+	return db.readDB.QueryRowContext(db.ctx, query, args...)
+}
+
+func (db *DB) SetDataEncryptionKey(s string) error {
+	return db.dataEncryptionKey.FromBase64(s)
+}