Initial commit

internal/moon/config.go

@@ -0,0 +1,100 @@
+package moon
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/hjson/hjson-go"
+	"go.uber.org/zap/zapcore"
+)
+
+// parseConfig разбирает и валидирует даденный конфиг.
+func ParseConfig(path string) (MyConfig, error) {
+	fileInfo, err := os.Stat(path)
+
+	// Assume that no such file or directory error occurs.
+	if err != nil {
+		return MyConfig{}, fmt.Errorf("unable to find config: %w", err)
+	}
+
+	// Config file looks too long for config.
+	if fileInfo.Size() > 65535 {
+		err := fmt.Errorf("config file %s is too long for config, skipping", path) //nolint: err113
+
+		return MyConfig{}, err
+	}
+
+	buf, err := os.ReadFile(path)
+
+	// Noluck reading file.
+	if err != nil {
+		return MyConfig{}, err
+	}
+
+	/*
+	 * According to docs hjson kinda can patse quirky json, but unmarshalls it to map.                            *
+	 * Struct on output look more interesting: so we unmarshall config to map, then mashall back to json and then *
+	 * unmarshall it via ecodinf/json to struct. Not very effective way but we do this not too often.             *
+	 */
+	var (
+		sampleConfig MyConfig
+		tmp          map[string]any
+	)
+
+	err = hjson.Unmarshal(buf, &tmp)
+
+	// Не удалось распарсить.
+	if err != nil {
+		return MyConfig{}, err
+	}
+
+	tmpjson, err := json.Marshal(tmp)
+
+	// Не удалось преобразовать map-ку в json.
+	if err != nil {
+		return MyConfig{}, err
+	}
+
+	if err := json.Unmarshal(tmpjson, &sampleConfig); err != nil {
+		return MyConfig{}, err
+	}
+
+	if sampleConfig.Token == "" {
+		return MyConfig{}, fmt.Errorf("token field in config file %s must be set", path) //nolint: err113
+	}
+
+	if _, err := zapcore.ParseLevel(sampleConfig.LogLevel); err != nil {
+		sampleConfig.LogLevel = "info"
+	}
+
+	// sampleConfig.Log = "" if not set
+
+	if sampleConfig.CSign == "" {
+		err := fmt.Errorf("csign field in config file %s must be set", path) //nolint: err113
+
+		return MyConfig{}, err
+	}
+
+	if sampleConfig.DataDir == "" {
+		return MyConfig{}, fmt.Errorf("data_dir field in config file %s must be set", path) //nolint: err113
+	}
+
+	if strings.Split(sampleConfig.DataDir, "")[0] != "/" {
+		executablePath, err := os.Executable()
+
+		if err != nil {
+			err := fmt.Errorf("unable to get current executable path: %w", err)
+
+			return MyConfig{}, err
+		}
+
+		sampleConfig.DataDir = fmt.Sprintf("%s/%s", filepath.Dir(executablePath), sampleConfig.DataDir)
+	}
+
+	return sampleConfig, err
+}
+
+/* vim: set ft=go noet ai ts=4 sw=4 sts=4: */