feat: add option DefaultCompressionLevel, default NoCompression

okhowang · weijunyi · commit 209ab618c943 · 2024-11-19T14:50:37.000+08:00
before:
BenchmarkGenSig
BenchmarkGenSig-16               	   39601	     30510 ns/op	    3896 B/op	      42 allocs/op
BenchmarkGenUserSigWithBuf
BenchmarkGenUserSigWithBuf-16    	   38188	     31464 ns/op	    4064 B/op	      48 allocs/op

after:
BenchmarkGenSig
BenchmarkGenSig-16               	  191563	      6149 ns/op	    4400 B/op	      41 allocs/op
BenchmarkGenUserSigWithBuf
BenchmarkGenUserSigWithBuf-16    	  180298	      6598 ns/op	    4357 B/op	      45 allocs/op
diff --git a/tencentyun/TLSSigAPI.go b/tencentyun/TLSSigAPI.go
@@ -423,9 +423,18 @@ var (
 func newZlibWriter(w io.Writer) *zlib.Writer {
 	v := zlibWriterPool.Get()
 	if v == nil {
-		return zlib.NewWriter(w)
+		zw, err := zlib.NewWriterLevel(w, DefaultCompressionLevel)
+		if err != nil {
+			return zlib.NewWriter(w)
+		}
+		return zw
 	}
 	zw := v.(*zlib.Writer)
 	zw.Reset(w)
 	return zw
 }
+
+// DefaultCompressionLevel is the default compression level.
+// Default is zlib.NoCompression.
+// It can be set to any valid compression level to balance speed and size.
+var DefaultCompressionLevel = zlib.NoCompression
