Refactor configuration management and enhance build process

- Introduced a YAML-based configuration system, allowing for automatic generation of a default `config.yaml` file.
- Updated the application to load configuration settings from the YAML file, improving flexibility and ease of use.
- Added a Makefile to streamline development tasks, including running the application, testing, and managing dependencies.
- Enhanced `.gitignore` to include build artifacts and configuration files.
- Removed unused Prometheus metrics and related code to simplify the codebase.
- Updated dependencies in `go.mod` and `go.sum` for improved functionality and performance.

cmd/root.go

@@ -2,26 +2,22 @@
 package cmd
 
 import (
+	"fmt"
 	"os"
 	"runtime"
+	"s1d3sw1ped/SteamCache2/config"
 	"s1d3sw1ped/SteamCache2/steamcache"
 	"s1d3sw1ped/SteamCache2/steamcache/logger"
 	"s1d3sw1ped/SteamCache2/version"
+	"strings"
 
 	"github.com/rs/zerolog"
 	"github.com/spf13/cobra"
 )
 
 var (
-	threads int
-
-	memory   string
-	disk     string
-	diskpath string
-	upstream string
-
-	memoryGC string
-	diskGC   string
+	threads    int
+	configPath string
 
 	logLevel  string
 	logFormat string
@@ -58,7 +54,47 @@ var rootCmd = &cobra.Command{
 		logger.Logger.Info().
 			Msg("SteamCache2 " + version.Version + " " + version.Date + " starting...")
 
-		address := ":80"
+		// Load configuration
+		cfg, err := config.LoadConfig(configPath)
+		if err != nil {
+			// Check if the error is because the config file doesn't exist
+			// The error is wrapped, so we check the error message
+			if strings.Contains(err.Error(), "no such file") ||
+				strings.Contains(err.Error(), "cannot find the file") ||
+				strings.Contains(err.Error(), "The system cannot find the file") {
+				logger.Logger.Info().
+					Str("config_path", configPath).
+					Msg("Config file not found, creating default configuration")
+
+				if err := config.SaveDefaultConfig(configPath); err != nil {
+					logger.Logger.Error().
+						Err(err).
+						Str("config_path", configPath).
+						Msg("Failed to create default configuration")
+					fmt.Fprintf(os.Stderr, "Error: Failed to create default config at %s: %v\n", configPath, err)
+					os.Exit(1)
+				}
+
+				logger.Logger.Info().
+					Str("config_path", configPath).
+					Msg("Default configuration created successfully. Please edit the file and run again.")
+
+				fmt.Printf("Default configuration created at %s\n", configPath)
+				fmt.Println("Please edit the configuration file as needed and run the application again.")
+				os.Exit(0)
+			} else {
+				logger.Logger.Error().
+					Err(err).
+					Str("config_path", configPath).
+					Msg("Failed to load configuration")
+				fmt.Fprintf(os.Stderr, "Error: Failed to load configuration from %s: %v\n", configPath, err)
+				os.Exit(1)
+			}
+		}
+
+		logger.Logger.Info().
+			Str("config_path", configPath).
+			Msg("Configuration loaded successfully")
 
 		if runtime.GOMAXPROCS(-1) != threads {
 			runtime.GOMAXPROCS(threads)
@@ -68,17 +104,17 @@ var rootCmd = &cobra.Command{
 		}
 
 		sc := steamcache.New(
-			address,
-			memory,
-			disk,
-			diskpath,
-			upstream,
-			memoryGC,
-			diskGC,
+			cfg.ListenAddress,
+			cfg.Cache.Memory.Size,
+			cfg.Cache.Disk.Size,
+			cfg.Cache.Disk.Path,
+			cfg.Upstream,
+			cfg.Cache.Memory.GCAlgorithm,
+			cfg.Cache.Disk.GCAlgorithm,
 		)
 
 		logger.Logger.Info().
-			Msg("SteamCache2 " + version.Version + " started on " + address)
+			Msg("SteamCache2 " + version.Version + " started on " + cfg.ListenAddress)
 
 		sc.Run()
 
@@ -97,17 +133,10 @@ func Execute() {
 }
 
 func init() {
+	rootCmd.Flags().StringVarP(&configPath, "config", "c", "config.yaml", "Path to configuration file")
+
 	rootCmd.Flags().IntVarP(&threads, "threads", "t", runtime.GOMAXPROCS(-1), "Number of worker threads to use for processing requests")
 
-	rootCmd.Flags().StringVarP(&memory, "memory", "m", "0", "The size of the memory cache")
-	rootCmd.Flags().StringVarP(&disk, "disk", "d", "0", "The size of the disk cache")
-	rootCmd.Flags().StringVarP(&diskpath, "disk-path", "p", "", "The path to the disk cache")
-
-	rootCmd.Flags().StringVarP(&upstream, "upstream", "u", "", "The upstream server to proxy requests overrides the host header from the client but forwards the original host header to the upstream server")
-
-	rootCmd.Flags().StringVarP(&memoryGC, "memory-gc", "", "lru", "Memory cache GC algorithm: lru, lfu, fifo, largest, smallest, hybrid")
-	rootCmd.Flags().StringVarP(&diskGC, "disk-gc", "", "lru", "Disk cache GC algorithm: lru, lfu, fifo, largest, smallest, hybrid")
-
 	rootCmd.Flags().StringVarP(&logLevel, "log-level", "l", "info", "Logging level: debug, info, error")
 	rootCmd.Flags().StringVarP(&logFormat, "log-format", "f", "console", "Logging format: json, console")
 }