feat(logs): change logs to structured json

README.md

@@ -1,32 +1,51 @@
 # Trackers
 
-Опрашивает ссылки со списками torrent-трекеров, 
-соединяет их в один список. Поддерживает кеширование,
-http, file источники.
+A torrent tracker aggregator that polls multiple sources and serves a unified, 
+deduplicated list of tracker URLs via HTTP API.
 
-Учебный проект.
+**Educational project written in Go 1.25.5**
 
-## Запуск
+## Features
+
+- Polls tracker sources at configurable intervals
+- Supports HTTP/HTTPS and local file sources
+- Deduplicates and validates tracker URLs
+- Persistent disk caching for resilience
+- HTTP proxy support via environment variables
+- Request logging for monitoring
+- Single binary with minimal dependencies
+
+## Usage
 
 ```shell
-trackers --config config.toml
+trackers -config config.toml
 ```
 
-Получение списка трекеров:
+Get the aggregated tracker list:
 
 ```shell
 curl http://127.0.0.1:8080/list
 ```
 
-## Конфигурация
+## Configuration
 
-Источники для трекеров описываются в toml-конфиге:
+See [config.dist.toml](config.dist.toml) for a complete configuration example with comments.
 
-```toml
-port = 8080
+Copy the example file and customize:
 
-sources = [
-    "https://example.com",
-    "file:///home/user/local-file.txt",
-]
+```shell
+cp config.dist.toml config.toml
+# Edit config.toml with your sources
 ```
+
+## Proxy Support
+
+HTTP requests respect standard proxy environment variables:
+
+```shell
+export HTTP_PROXY=http://proxy.example.com:8080
+export HTTPS_PROXY=http://proxy.example.com:8080
+trackers -config config.toml
+```
+
+See [config.dist.toml](config.dist.toml) for details.

config.dist.toml

@@ -0,0 +1,44 @@
+# Trackers Configuration Example
+# Copy this file to config.toml and adjust values for your setup
+
+# HTTP server port
+# Default: 8080
+port = 8080
+
+# Directory for caching tracker lists
+# Used to persist tracker data between restarts and handle source failures
+# Default: "cache"
+cache_dir = "cache"
+
+# Interval between polling each source
+# Valid units: s (seconds), m (minutes), h (hours)
+# Examples: "30s", "5m", "1h", "90m"
+# Default: "60m"
+poll_interval = "60m"
+
+# List of tracker sources to aggregate
+# Supported schemes:
+#   - http:// / https:// - Remote HTTP endpoints
+#   - file:// - Local files (e.g., file:///path/to/trackers.txt)
+#
+# Each source should return tracker URLs, one per line
+# Blank lines and duplicates are automatically filtered
+sources = [
+    "https://example.com/trackers/all.txt",
+    "https://another-source.org/trackers.txt",
+    # "file:///etc/trackers/local.txt",
+]
+
+# Proxy Configuration
+# ==================
+# HTTP requests automatically respect standard proxy environment variables:
+#
+#   HTTP_PROXY  - Proxy for HTTP requests (e.g., http://proxy.example.com:8080)
+#   HTTPS_PROXY - Proxy for HTTPS requests (e.g., http://proxy.example.com:8080)
+#   NO_PROXY    - Comma-separated list of hosts to bypass proxy (e.g., localhost,127.0.0.1)
+#
+# Example usage:
+#   export HTTP_PROXY=http://proxy.example.com:8080
+#   export HTTPS_PROXY=http://proxy.example.com:8080
+#   export NO_PROXY=localhost,127.0.0.1,.local
+#   ./trackers -config config.toml

main.go

@@ -8,7 +8,7 @@ import (
 	"flag"
 	"fmt"
 	"io"
-	"log"
+	"log/slog"
 	"net/http"
 	"net/url"
 	"os"
@@ -111,13 +111,17 @@ func main() {
 	configPath := flag.String("config", "config.toml", "path to config file")
 	flag.Parse()
 
+	slog.SetDefault(slog.New(slog.NewJSONHandler(os.Stdout, nil)))
+
 	cfg, interval, err := loadConfig(*configPath)
 	if err != nil {
-		log.Fatalf("config error: %v", err)
+		slog.Error("config load failed", "error", err)
+		os.Exit(1)
 	}
 
 	if err := os.MkdirAll(cfg.CacheDir, 0o755); err != nil {
-		log.Fatalf("cache dir: %v", err)
+		slog.Error("cache dir create failed", "error", err)
+		os.Exit(1)
 	}
 
 	agg := NewAggregator()
@@ -133,7 +137,7 @@ func main() {
 	for _, source := range cfg.Sources {
 		cached, err := loadCachedLinks(cfg.CacheDir, source)
 		if err != nil {
-			log.Printf("load cache for %s: %v", source, err)
+			slog.Error("load cache failed", "source", source, "error", err)
 		}
 		if len(cached) > 0 {
 			agg.Update(source, cached)
@@ -149,7 +153,7 @@ func main() {
 
 	mux := http.NewServeMux()
 	mux.HandleFunc("/list", func(w http.ResponseWriter, r *http.Request) {
-		log.Printf("request /list from %s [%s %s]", r.RemoteAddr, r.Method, r.UserAgent())
+		slog.Info("request", "path", "/list", "remote", r.RemoteAddr, "method", r.Method, "user_agent", r.UserAgent())
 		links := agg.List()
 		w.Header().Set("Content-Type", "text/plain; charset=utf-8")
 		for i, link := range links {
@@ -158,7 +162,7 @@ func main() {
 			}
 			_, _ = w.Write([]byte(link))
 		}
-		log.Printf("response /list to %s: %d links", r.RemoteAddr, len(links))
+		slog.Info("response", "path", "/list", "remote", r.RemoteAddr, "links", len(links))
 	})
 
 	server := &http.Server{
@@ -173,15 +177,16 @@ func main() {
 		<-ctx.Done()
 		shutdownCtx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
 		defer cancel()
-		log.Printf("server shutdown")
+		slog.Info("server shutting down")
 		if err := server.Shutdown(shutdownCtx); err != nil {
-			log.Printf("server shutdown error: %v", err)
+			slog.Error("server shutdown failed", "error", err)
 		}
 	}()
 
-	log.Printf("listening on :%d", cfg.Port)
+	slog.Info("listening", "port", cfg.Port)
 	if err := server.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
-		log.Fatalf("server error: %v", err)
+		slog.Error("server listen failed", "error", err)
+		os.Exit(1)
 	}
 }
 
@@ -194,7 +199,7 @@ func pollSource(ctx context.Context, source string, interval time.Duration, cach
 	for {
 		select {
 		case <-ctx.Done():
-			log.Printf("poller shutdown")
+			slog.Info("poller stopped", "source", source)
 			return
 		case <-ticker.C:
 			runOnce(ctx, source, cacheDir, agg, client)
@@ -205,22 +210,22 @@ func pollSource(ctx context.Context, source string, interval time.Duration, cach
 func runOnce(ctx context.Context, source string, cacheDir string, agg *Aggregator, client *http.Client) {
 	links, err := fetchSource(ctx, source, client)
 	if err != nil {
-		log.Printf("poll %s: failed - %v", source, err)
+		slog.Error("poll failed", "source", source, "error", err)
 		return
 	}
 	if len(links) == 0 {
-		log.Printf("poll %s: success - 0 links", source)
+		slog.Info("poll success", "source", source, "links", 0)
 		agg.Update(source, nil)
 		if err := writeCache(cacheDir, source, nil); err != nil {
-			log.Printf("write cache %s: %v", source, err)
+			slog.Error("write cache failed", "source", source, "error", err)
 		}
 		return
 	}
 
-	log.Printf("poll %s: success - %d links", source, len(links))
+	slog.Info("poll success", "source", source, "links", len(links))
 	agg.Update(source, links)
 	if err := writeCache(cacheDir, source, links); err != nil {
-		log.Printf("write cache %s: %v", source, err)
+		slog.Error("write cache failed", "source", source, "error", err)
 	}
 }
 
@@ -244,11 +249,11 @@ func fetchSource(ctx context.Context, source string, client *http.Client) ([]str
 		if resp.StatusCode < 200 || resp.StatusCode >= 300 {
 			return nil, fmt.Errorf("unexpected status: %s", resp.Status)
 		}
-		log.Printf("fetch %s: HTTP %d", source, resp.StatusCode)
 		body, err := io.ReadAll(resp.Body)
 		if err != nil {
 			return nil, fmt.Errorf("read body: %w", err)
 		}
+		slog.Info("fetch complete", "source", source, "status", resp.StatusCode, "bytes", len(body))
 		return normalizeLinks(string(body)), nil
 	case "file":
 		path := u.Path
@@ -259,7 +264,7 @@ func fetchSource(ctx context.Context, source string, client *http.Client) ([]str
 		if err != nil {
 			return nil, fmt.Errorf("read file: %w", err)
 		}
-		log.Printf("fetch %s: file read %d bytes", source, len(data))
+		slog.Info("fetch complete", "source", source, "bytes", len(data))
 		return normalizeLinks(string(data)), nil
 	default:
 		return nil, fmt.Errorf("unsupported source scheme: %s", u.Scheme)