Use go 1.17 ability to re-use LZW writer

go.mod

@@ -0,0 +1,23 @@
+module github.com/NinesStack/memberlist
+
+go 1.17
+
+require (
+	github.com/armon/go-metrics v0.3.10
+	github.com/hashicorp/go-msgpack v1.1.5
+	github.com/hashicorp/go-multierror v1.1.1
+	github.com/hashicorp/go-sockaddr v1.0.2
+	github.com/miekg/dns v1.1.48
+	github.com/sean-/seed v0.0.0-20170313163322-e2103e2c3529
+)
+
+require (
+	github.com/hashicorp/errwrap v1.0.0 // indirect
+	github.com/hashicorp/go-immutable-radix v1.0.0 // indirect
+	github.com/hashicorp/golang-lru v0.5.0 // indirect
+	golang.org/x/mod v0.4.2 // indirect
+	golang.org/x/net v0.0.0-20210726213435-c6fcb2dbf985 // indirect
+	golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c // indirect
+	golang.org/x/tools v0.1.6-0.20210726203631-07bc1bf47fb2 // indirect
+	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
+)

go.sum

@@ -0,0 +1,149 @@
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+golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

net.go

@@ -1107,7 +1107,7 @@ func (m *Memberlist) sendPingAndWaitForAck(addr string, ping ping, deadline time
 	}
 
 	if ack.SeqNo != ping.SeqNo {
-		return false, fmt.Errorf("Sequence number from ack (%d) doesn't match ping (%d)", ack.SeqNo, ping.SeqNo, LogConn(conn))
+		return false, fmt.Errorf("Sequence number from ack (%d) doesn't match ping (%d) %s", ack.SeqNo, ping.SeqNo, LogConn(conn))
 	}
 
 	return true, nil

net_test.go

@@ -825,17 +825,17 @@ func TestHandleSuspect(t *testing.T) {
 
 	a1buf, a1err := encode(aliveMsg, a1)
 	if a1err != nil {
-		t.Fatal("Unexpected error: %v", a1err)
+		t.Fatalf("Unexpected error: %v", a1err)
 	}
 
 	a2buf, a2err := encode(aliveMsg, a2)
 	if a2err != nil {
-		t.Fatal("Unexpected error: %v", a2err)
+		t.Fatalf("Unexpected error: %v", a2err)
 	}
 
 	a3buf, a3err := encode(aliveMsg, a3)
 	if a3err != nil {
-		t.Fatal("Unexpected error: %v", a3err)
+		t.Fatalf("Unexpected error: %v", a3err)
 	}
 
 	m1.handleAlive(a1buf.Bytes()[1:], addr)
@@ -858,7 +858,7 @@ func TestHandleSuspect(t *testing.T) {
 
 	s1buf, s1err := encode(suspectMsg, s1)
 	if s1err != nil {
-		t.Fatal("Unexpected error: %v", s1err)
+		t.Fatalf("Unexpected error: %v", s1err)
 	}
 
 	// Send the message, shouldn't get discarded; state should change
@@ -873,7 +873,7 @@ func TestHandleSuspect(t *testing.T) {
 
 	s2buf, s2err := encode(suspectMsg, s2)
 	if s2err != nil {
-		t.Fatal("Unexpected error: %v", s2err)
+		t.Fatalf("Unexpected error: %v", s2err)
 	}
 
 	m1.handleSuspect(s2buf.Bytes()[1:], addr)
@@ -904,18 +904,18 @@ func TestHandleAlive(t *testing.T) {
 	// Encode 2 alive messages with the same cluster name
 	a1buf, err := encode(aliveMsg, a1)
 	if err != nil {
-		t.Fatal("Unexpected error: %v", err)
+		t.Fatalf("Unexpected error: %v", err)
 	}
 
 	a2buf, err2 := encode(aliveMsg, a2)
 	if err2 != nil {
-		t.Fatal("Unexpected error: %v", err2)
+		t.Fatalf("Unexpected error: %v", err2)
 	}
 
 	// Encode a third message with a different cluster name
 	a3buf, err3 := encode(aliveMsg, a3)
 	if err3 != nil {
-		t.Fatal("Unexpected error: %v", err3)
+		t.Fatalf("Unexpected error: %v", err3)
 	}
 
 	m1.handleAlive(a1buf.Bytes()[1:], addr)
@@ -952,17 +952,17 @@ func TestHandleDead(t *testing.T) {
 
 	a1buf, a1err := encode(aliveMsg, a1)
 	if a1err != nil {
-		t.Fatal("Unexpected error: %v", a1err)
+		t.Fatalf("Unexpected error: %v", a1err)
 	}
 
 	a2buf, a2err := encode(aliveMsg, a2)
 	if a2err != nil {
-		t.Fatal("Unexpected error: %v", a2err)
+		t.Fatalf("Unexpected error: %v", a2err)
 	}
 
 	a3buf, a3err := encode(aliveMsg, a3)
 	if a3err != nil {
-		t.Fatal("Unexpected error: %v", a3err)
+		t.Fatalf("Unexpected error: %v", a3err)
 	}
 
 	m1.handleAlive(a1buf.Bytes()[1:], addr)
@@ -985,7 +985,7 @@ func TestHandleDead(t *testing.T) {
 
 	d1buf, d1err := encode(deadMsg, d1)
 	if d1err != nil {
-		t.Fatal("Unexpected error: %v", d1err)
+		t.Fatalf("Unexpected error: %v", d1err)
 	}
 
 	// Send the message, shouldn't get discarded; state should change
@@ -1000,7 +1000,7 @@ func TestHandleDead(t *testing.T) {
 
 	d2buf, d2err := encode(deadMsg, d2)
 	if d2err != nil {
-		t.Fatal("Unexpected error: %v", d2err)
+		t.Fatalf("Unexpected error: %v", d2err)
 	}
 
 	m1.handleDead(d2buf.Bytes()[1:], addr)

util.go

@@ -29,6 +29,11 @@ const (
 	lzwLitWidth = 8
 )
 
+var (
+	compressor *lzw.Writer
+	compressorBuf bytes.Buffer
+)
+
 func init() {
 	seed.Init()
 }
@@ -234,8 +239,14 @@ func hasPort(s string) bool {
 // compressPayload takes an opaque input buffer, compresses it
 // and wraps it in a compress{} message that is encoded.
 func compressPayload(inp []byte) (*bytes.Buffer, error) {
-	var buf bytes.Buffer
-	compressor := lzw.NewWriter(&buf, lzw.LSB, lzwLitWidth)
+	// Re-use LZW compression buffer. These things are huge.
+	if compressor == nil {
+		tmpCompressor := lzw.NewWriter(&compressorBuf, lzw.LSB, lzwLitWidth)
+		compressor = tmpCompressor.(*lzw.Writer)
+	} else {
+		compressorBuf.Reset()
+		compressor.Reset(&compressorBuf, lzw.LSB, lzwLitWidth)
+	}
 
 	_, err := compressor.Write(inp)
 	if err != nil {
@@ -250,7 +261,7 @@ func compressPayload(inp []byte) (*bytes.Buffer, error) {
 	// Create a compressed message
 	c := compress{
 		Algo: lzwAlgo,
-		Buf:  buf.Bytes(),
+		Buf:  compressorBuf.Bytes(),
 	}
 	return encode(compressMsg, &c)
 }