fix: optimize memory usage, fix agent and code refactor (#118)

* refactor: simplify io code and make utils module independent

* fix(docker): agent and socket-proxy docker event flushing with modified reverse proxy handler

* refactor: remove unused code

* refactor: remove the use of logging module in most code

* refactor: streamline domain mismatch check in certState function

* tweak: use ecdsa p-256 for autocert

* fix(tests): update health check tests for invalid host and add case for port in host

* feat(acme): custom acme directory

* refactor: code refactor and improved context and error handling

* tweak: optimize memory usage under load

* fix(oidc): restore old user matching behavior

* docs: add ChatGPT assistant to README

---------

Co-authored-by: yusing <yusing@6uo.me>

internal/utils/synk/pool_debug.go

@@ -0,0 +1,55 @@
+//go:build !production
+
+package synk
+
+import (
+	"os"
+	"os/signal"
+	"runtime"
+	"sync/atomic"
+	"time"
+
+	"github.com/rs/zerolog/log"
+	"github.com/yusing/go-proxy/internal/utils/strutils"
+)
+
+var (
+	numReused, sizeReused uint64
+	numGCed, sizeGCed     uint64
+)
+
+func addReused(size int) {
+	atomic.AddUint64(&numReused, 1)
+	atomic.AddUint64(&sizeReused, uint64(size))
+}
+
+func addGCed(size int) {
+	atomic.AddUint64(&numGCed, 1)
+	atomic.AddUint64(&sizeGCed, uint64(size))
+}
+
+var addCleanup = runtime.AddCleanup[[]byte, int]
+
+func initPoolStats() {
+	go func() {
+		statsTicker := time.NewTicker(5 * time.Second)
+		defer statsTicker.Stop()
+
+		sig := make(chan os.Signal, 1)
+		signal.Notify(sig, os.Interrupt)
+
+		for {
+			select {
+			case <-sig:
+				return
+			case <-statsTicker.C:
+				log.Info().
+					Uint64("numReused", atomic.LoadUint64(&numReused)).
+					Str("sizeReused", strutils.FormatByteSize(atomic.LoadUint64(&sizeReused))).
+					Uint64("numGCed", atomic.LoadUint64(&numGCed)).
+					Str("sizeGCed", strutils.FormatByteSize(atomic.LoadUint64(&sizeGCed))).
+					Msg("bytes pool stats")
+			}
+		}
+	}()
+}