add tests for TCP and lneto along with TCB control logic

internal/debug.go

@@ -0,0 +1,7 @@
+package internal
+
+import "log/slog"
+
+const (
+	LevelTrace slog.Level = slog.LevelDebug - 2
+)

internal/debug_heaplog.go

@@ -0,0 +1,60 @@
+//go:build debugheaplog
+
+package internal
+
+import (
+	"log/slog"
+	"runtime"
+	"time"
+	"unsafe"
+)
+
+const (
+	HeapAllocDebugging = true
+	timefmt            = "[01-02 15:04:05.000]"
+)
+
+var (
+	memstats   runtime.MemStats
+	lastAllocs uint64
+
+	timebuf [len(timefmt) * 2]byte
+)
+
+func LogAttrs(_ *slog.Logger, level slog.Level, msg string, attrs ...slog.Attr) {
+	now := time.Now()
+	n := len(now.AppendFormat(timebuf[:0], timefmt))
+	runtime.ReadMemStats(&memstats)
+	if memstats.TotalAlloc != lastAllocs {
+		print("[ALLOC] inc=", int64(memstats.TotalAlloc)-int64(lastAllocs))
+		print(" tot=", memstats.TotalAlloc, " seqs")
+		println()
+	}
+	print("time=", unsafe.String(&timebuf[0], n), " ")
+	if level == LevelTrace {
+		print("TRACE ")
+	} else if level < slog.LevelDebug {
+		print("SEQS ")
+	} else {
+		print(level.String(), " ")
+	}
+	print(msg)
+
+	for _, a := range attrs {
+		switch a.Value.Kind() {
+		case slog.KindString:
+			print(" ", a.Key, "=", a.Value.String())
+		case slog.KindInt64:
+			print(" ", a.Key, "=", a.Value.Int64())
+		case slog.KindUint64:
+			print(" ", a.Key, "=", a.Value.Uint64())
+		case slog.KindBool:
+			print(" ", a.Key, "=", a.Value.Bool())
+		}
+	}
+	println()
+	runtime.ReadMemStats(&memstats)
+	if memstats.TotalAlloc != lastAllocs {
+		lastAllocs = memstats.TotalAlloc
+	}
+}

internal/debug_noheaplog.go

@@ -0,0 +1,19 @@
+//go:build !debugheaplog
+
+package internal
+
+import (
+	"context"
+	"log/slog"
+)
+
+const HeapAllocDebugging = false
+
+// LogAttrs is a helper function that is used by all package loggers and that
+// can be switched out with the `debugheaplog` build tag for a non-allocating
+// logger that prints out when heap allocations occur.
+func LogAttrs(l *slog.Logger, level slog.Level, msg string, attrs ...slog.Attr) {
+	if l != nil {
+		l.LogAttrs(context.Background(), level, msg, attrs...)
+	}
+}