init; project structure & bybit provider

internal/config/config.go

@@ -0,0 +1,45 @@
+package config
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/ilyakaznacheev/cleanenv"
+)
+
+type Config struct {
+	Logger    Logger `yaml:"logger"`
+	Providers struct {
+		Bybit Bybit `yaml:"bybit"`
+	} `yaml:"providers"`
+}
+
+type Logger struct {
+	ServiceName string `yaml:"service_name" env-required:"true"` // service name for printing in logs
+	Encoding    string `yaml:"encoding" env-default:"json"`      // console/json
+	Level       string `yaml:"level" env-default:"info"`         // debug/info/warn/error
+}
+
+type Bybit struct {
+	BaseURL string `yaml:"base_url" env-default:"https://api.bybit.com"` // bybit api url
+}
+
+// MustLoad returns config or panic.
+func MustLoad() *Config {
+	configPath := os.Getenv("CONFIG_PATH")
+	if configPath == "" {
+		panic("CONFIG_PATH is not set")
+	}
+	// check if file exists
+	if _, err := os.Stat(configPath); os.IsNotExist(err) {
+		panic(fmt.Sprintf("config file does not exist: %s", configPath))
+	}
+
+	var cfg Config
+	// read config
+	if err := cleanenv.ReadConfig(configPath, &cfg); err != nil {
+		panic(fmt.Errorf("cannot read config: %w", err))
+	}
+
+	return &cfg
+}