add error handling to arg encoding and message/bundle ToBytes()

.gitignore

@@ -1 +1,2 @@
-build
+build
+coverage*

bundle.go

@@ -4,21 +4,32 @@ import (
 	"errors"
 )
 
-func (b *OSCBundle) ToBytes() []byte {
+func (b *OSCBundle) ToBytes() ([]byte, error) {
 
 	bytes := stringToOSCBytes("#bundle")
 
-	bytes = append(bytes, timeTagToOSCBytes(b.TimeTag)...)
+	timeTagBytes, err := timeTagToOSCBytes(b.TimeTag)
+	if err != nil {
+		return nil, err
+	}
+	bytes = append(bytes, timeTagBytes...)
 
 	for _, packet := range b.Contents {
-		packetBytes := packet.ToBytes()
+		packetBytes, err := packet.ToBytes()
-		packetLength := len(packet.ToBytes())
+		if err != nil {
+			return nil, err
+		}
+		packetLength := len(packetBytes)
 
-		bytes = append(bytes, int32ToOSCBytes(int32(packetLength))...)
+		packetLengthBytes, err := int32ToOSCBytes(int32(packetLength))
+		if err != nil {
+			return nil, err
+		}
+		bytes = append(bytes, packetLengthBytes...)
 		bytes = append(bytes, packetBytes...)
 	}
 
-	return bytes
+	return bytes, nil
 }
 
 func BundleFromBytes(bytes []byte) (*OSCBundle, []byte, error) {

bundle_test.go

@@ -9,9 +9,9 @@ import (
 func TestOSCBundleEncoding(t *testing.T) {
 
 	testCases := []struct {
-		description string
+		name     string
-		bundle      *OSCBundle
+		bundle   *OSCBundle
-		expected    []byte
+		expected []byte
 	}{
 		{
 			"simple contents single message",
@@ -32,13 +32,19 @@ func TestOSCBundleEncoding(t *testing.T) {
 
 	for _, testCase := range testCases {
 
-		actual := testCase.bundle.ToBytes()
+		t.Run(testCase.name, func(t *testing.T) {
+
+			got, err := testCase.bundle.ToBytes()
+
+			if err != nil {
+				t.Fatalf("failed to encode properly: %s", err.Error())
+			}
+
+			if !reflect.DeepEqual(got, testCase.expected) {
+				t.Fatalf("failed to encode properly got '%v', expected '%v'", got, testCase.expected)
+			}
+		})
 
-		if !reflect.DeepEqual(actual, testCase.expected) {
-			t.Errorf("Test '%s' failed to encode properly", testCase.description)
-			fmt.Printf("expected: %v\n", testCase.expected)
-			fmt.Printf("actual: %v\n", actual)
-		}
 	}
 
 }

cmd/makeosc/makeosc.go

@@ -175,7 +175,10 @@ func make(address string, args []string, types []string, slip bool) {
 		oscMessage.Args = append(oscMessage.Args, argToTypedArg(arg, oscType))
 	}
 
-	oscMessageBuffer := oscMessage.ToBytes()
+	oscMessageBuffer, err := oscMessage.ToBytes()
+	if err != nil {
+		panic(err)
+	}
 
 	if slip {
 		oscMessageBuffer = slipEncode(oscMessageBuffer)

cmd/sendosc/sendosc.go

@@ -208,7 +208,10 @@ func send(host string, port int32, address string, args []string, types []string
 
 	}
 
-	oscMessageBuffer := oscMessage.ToBytes()
+	oscMessageBuffer, err := oscMessage.ToBytes()
+	if err != nil {
+		panic(err)
+	}
 
 	if slip {
 		oscMessageBuffer = slipEncode(oscMessageBuffer)

message.go

@@ -5,7 +5,7 @@ import (
 	"strings"
 )
 
-func (m *OSCMessage) ToBytes() []byte {
+func (m *OSCMessage) ToBytes() ([]byte, error) {
 	//TODO(jwetzell): add error handling
 	oscBuffer := []byte{}
 
@@ -20,9 +20,13 @@ func (m *OSCMessage) ToBytes() []byte {
 	}
 
 	oscBuffer = append(oscBuffer, stringToOSCBytes(sb.String())...)
-	oscBuffer = append(oscBuffer, argsToBuffer(m.Args)...)
+	argsBuffer, err := argsToBuffer(m.Args)
+	if err != nil {
+		return nil, err
+	}
+	oscBuffer = append(oscBuffer, argsBuffer...)
 
-	return oscBuffer
+	return oscBuffer, nil
 }
 
 func MessageFromBytes(bytes []byte) (*OSCMessage, error) {

message_test.go

@@ -128,10 +128,14 @@ func TestGoodOSCMessageEncoding(t *testing.T) {
 
 	for _, testCase := range testCases {
 		t.Run(testCase.name, func(t *testing.T) {
-			actual := testCase.message.ToBytes()
+			got, err := testCase.message.ToBytes()
 
-			if !reflect.DeepEqual(actual, testCase.expected) {
+			if err != nil {
-				t.Fatalf("failed to encode properly got '%v', expected '%v'", actual, testCase.expected)
+				t.Fatalf("failed to encode properly: %s", err.Error())
+			}
+
+			if !reflect.DeepEqual(got, testCase.expected) {
+				t.Fatalf("failed to encode properly got '%v', expected '%v'", got, testCase.expected)
 			}
 		})
 	}

osc.go

@@ -26,47 +26,51 @@ func stringToOSCBytes(rawString string) []byte {
 	return []byte(sb.String())
 }
 
-func int32ToOSCBytes(number int32) []byte {
+func int32ToOSCBytes(number int32) ([]byte, error) {
 	var buf bytes.Buffer
 	err := binary.Write(&buf, binary.BigEndian, number)
 	if err != nil {
-		panic(err)
+		return nil, err
 	}
-	return buf.Bytes()
+	return buf.Bytes(), nil
 }
 
-func int64ToOSCBytes(number int64) []byte {
+func int64ToOSCBytes(number int64) ([]byte, error) {
 	var buf bytes.Buffer
 	err := binary.Write(&buf, binary.BigEndian, number)
 	if err != nil {
-		panic(err)
+		return nil, err
 	}
-	return buf.Bytes()
+	return buf.Bytes(), nil
 }
 
-func float32ToOSCBytes(number float32) []byte {
+func float32ToOSCBytes(number float32) ([]byte, error) {
 	var buf bytes.Buffer
 	err := binary.Write(&buf, binary.BigEndian, number)
 	if err != nil {
-		panic(err)
+		return nil, err
 	}
-	return buf.Bytes()
+	return buf.Bytes(), nil
 }
 
-func float64ToOSCBytes(number float64) []byte {
+func float64ToOSCBytes(number float64) ([]byte, error) {
 	var buf bytes.Buffer
 	err := binary.Write(&buf, binary.BigEndian, number)
 	if err != nil {
-		panic(err)
+		return nil, err
 	}
-	return buf.Bytes()
+	return buf.Bytes(), nil
 }
 
-func byteArrayToOSCBytes(bytes []byte) []byte {
+func byteArrayToOSCBytes(bytes []byte) ([]byte, error) {
 	oscBytes := []byte{}
 
 	bytesSize := len(bytes)
-	oscBytes = append(oscBytes, int32ToOSCBytes(int32(bytesSize))...)
+	bytesSizeBytes, err := int32ToOSCBytes(int32(bytesSize))
+	if err != nil {
+		return nil, err
+	}
+	oscBytes = append(oscBytes, bytesSizeBytes...)
 	oscBytes = append(oscBytes, bytes...)
 
 	padLength := 4 - (bytesSize % 4)
@@ -76,17 +80,24 @@ func byteArrayToOSCBytes(bytes []byte) []byte {
 		}
 	}
 
-	return oscBytes
+	return oscBytes, nil
 }
 
-func timeTagToOSCBytes(timeTag OSCTimeTag) []byte {
+func timeTagToOSCBytes(timeTag OSCTimeTag) ([]byte, error) {
-	timeTagBytes := int32ToOSCBytes(timeTag.seconds)
+	timeTagBytes, err := int32ToOSCBytes(timeTag.seconds)
-	timeTagBytes = append(timeTagBytes, int32ToOSCBytes(timeTag.fractionalSeconds)...)
+	if err != nil {
+		return nil, err
+	}
+	fractionalSecondsBytes, err := int32ToOSCBytes(timeTag.fractionalSeconds)
+	if err != nil {
+		return nil, err
+	}
+	timeTagBytes = append(timeTagBytes, fractionalSecondsBytes...)
 
-	return timeTagBytes
+	return timeTagBytes, nil
 }
 
-func argsToBuffer(args []OSCArg) []byte {
+func argsToBuffer(args []OSCArg) ([]byte, error) {
 	//TODO(jwetzell): add error handling
 	var argBuffers = []byte{}
 
@@ -100,29 +111,61 @@ func argsToBuffer(args []OSCArg) []byte {
 			}
 		case "i":
 			if value, ok := arg.Value.(int); ok {
-				argBuffers = append(argBuffers, int32ToOSCBytes(int32(value))...)
+				valueBytes, err := int32ToOSCBytes(int32(value))
+				if err != nil {
+					return nil, err
+				}
+				argBuffers = append(argBuffers, valueBytes...)
 			} else if value, ok := arg.Value.(int32); ok {
-				argBuffers = append(argBuffers, int32ToOSCBytes(value)...)
+				valueBytes, err := int32ToOSCBytes(int32(value))
+				if err != nil {
+					return nil, err
+				}
+				argBuffers = append(argBuffers, valueBytes...)
 			} else {
 				fmt.Println("OSC arg had integer type but non-integer value.")
 			}
 		case "f":
 			if value, ok := arg.Value.(float32); ok {
-				argBuffers = append(argBuffers, float32ToOSCBytes(float32(value))...)
+				valueBytes, err := float32ToOSCBytes(value)
+				if err != nil {
+					return nil, err
+				}
+				argBuffers = append(argBuffers, valueBytes...)
 			} else if value, ok := arg.Value.(float64); ok {
-				argBuffers = append(argBuffers, float32ToOSCBytes(float32(value))...)
+				valueBytes, err := float32ToOSCBytes(float32(value))
+				if err != nil {
+					return nil, err
+				}
+				argBuffers = append(argBuffers, valueBytes...)
 			} else if value, ok := arg.Value.(int); ok {
-				argBuffers = append(argBuffers, float32ToOSCBytes(float32(value))...)
+				valueBytes, err := float32ToOSCBytes(float32(value))
+				if err != nil {
+					return nil, err
+				}
+				argBuffers = append(argBuffers, valueBytes...)
 			} else if value, ok := arg.Value.(int32); ok {
-				argBuffers = append(argBuffers, float32ToOSCBytes(float32(value))...)
+				valueBytes, err := float32ToOSCBytes(float32(value))
+				if err != nil {
+					return nil, err
+				}
+				argBuffers = append(argBuffers, valueBytes...)
 			} else if value, ok := arg.Value.(int64); ok {
-				argBuffers = append(argBuffers, float32ToOSCBytes(float32(value))...)
+				valueBytes, err := float32ToOSCBytes(float32(value))
+				if err != nil {
+					return nil, err
+				}
+				argBuffers = append(argBuffers, valueBytes...)
 			} else {
 				fmt.Println("OSC arg had float type but non-float value.")
 			}
 		case "b":
 			if value, ok := arg.Value.([]byte); ok {
-				argBuffers = append(argBuffers, byteArrayToOSCBytes(value)...)
+				valueBytes, err := byteArrayToOSCBytes(value)
+				if err != nil {
+					return nil, err
+				}
+				argBuffers = append(argBuffers, valueBytes...)
 			} else {
 				fmt.Println("OSC arg had blob type but non-blob value.")
 			}
@@ -142,25 +185,57 @@ func argsToBuffer(args []OSCArg) []byte {
 			}
 		case "h":
 			if value, ok := arg.Value.(int); ok {
-				argBuffers = append(argBuffers, int64ToOSCBytes(int64(value))...)
+				valueBytes, err := int64ToOSCBytes(int64(value))
+				if err != nil {
+					return nil, err
+				}
+				argBuffers = append(argBuffers, valueBytes...)
 			} else if value, ok := arg.Value.(int32); ok {
-				argBuffers = append(argBuffers, int64ToOSCBytes(int64(value))...)
+				valueBytes, err := int64ToOSCBytes(int64(value))
+				if err != nil {
+					return nil, err
+				}
+				argBuffers = append(argBuffers, valueBytes...)
 			} else if value, ok := arg.Value.(int64); ok {
-				argBuffers = append(argBuffers, int64ToOSCBytes(value)...)
+				valueBytes, err := int64ToOSCBytes(value)
+				if err != nil {
+					return nil, err
+				}
+				argBuffers = append(argBuffers, valueBytes...)
 			} else {
 				fmt.Println("OSC arg had integer type but non-integer value.")
 			}
 		case "d":
 			if value, ok := arg.Value.(float32); ok {
-				argBuffers = append(argBuffers, float64ToOSCBytes(float64(value))...)
+				valueBytes, err := float64ToOSCBytes(float64(value))
+				if err != nil {
+					return nil, err
+				}
+				argBuffers = append(argBuffers, valueBytes...)
 			} else if value, ok := arg.Value.(float64); ok {
-				argBuffers = append(argBuffers, float64ToOSCBytes(float64(value))...)
+				valueBytes, err := float64ToOSCBytes(value)
+				if err != nil {
+					return nil, err
+				}
+				argBuffers = append(argBuffers, valueBytes...)
 			} else if value, ok := arg.Value.(int); ok {
-				argBuffers = append(argBuffers, float64ToOSCBytes(float64(value))...)
+				valueBytes, err := float64ToOSCBytes(float64(value))
+				if err != nil {
+					return nil, err
+				}
+				argBuffers = append(argBuffers, valueBytes...)
 			} else if value, ok := arg.Value.(int32); ok {
-				argBuffers = append(argBuffers, float64ToOSCBytes(float64(value))...)
+				valueBytes, err := float64ToOSCBytes(float64(value))
+				if err != nil {
+					return nil, err
+				}
+				argBuffers = append(argBuffers, valueBytes...)
 			} else if value, ok := arg.Value.(int64); ok {
-				argBuffers = append(argBuffers, float64ToOSCBytes(float64(value))...)
+				valueBytes, err := float64ToOSCBytes(float64(value))
+				if err != nil {
+					return nil, err
+				}
+				argBuffers = append(argBuffers, valueBytes...)
 			} else {
 				fmt.Println("OSC arg had float type but non-float value.")
 			}
@@ -168,7 +243,7 @@ func argsToBuffer(args []OSCArg) []byte {
 			fmt.Printf("unhandled osc type: %s.\n", oscType)
 		}
 	}
-	return argBuffers
+	return argBuffers, nil
 }
 
 func readOSCString(bytes []byte) (string, []byte, error) {

types.go

@@ -1,7 +1,7 @@
 package osc
 
 type OSCPacket interface {
-	ToBytes() []byte
+	ToBytes() ([]byte, error)
 }
 
 type OSCBundle struct {