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message.go
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message.go
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package datachannel
import (
"github.com/pkg/errors"
)
// Message is a parsed DataChannel message
type Message interface {
Marshal() ([]byte, error)
Unmarshal([]byte) error
}
// MessageType is the first byte in a DataChannel message that specifies type
type MessageType byte
// DataChannel Message Types
const (
DataChannelAck MessageType = 0x02
DataChannelOpen MessageType = 0x03
)
// Parse accepts raw input and returns a DataChannel message
func Parse(raw []byte) (Message, error) {
if len(raw) == 0 {
return nil, errors.Errorf("DataChannel message is not long enough to determine type ")
}
var msg Message
switch MessageType(raw[0]) {
case DataChannelOpen:
msg = &ChannelOpen{}
case DataChannelAck:
msg = &ChannelAck{}
default:
return nil, errors.Errorf("Unknown MessageType %v", MessageType(raw[0]))
}
if err := msg.Unmarshal(raw); err != nil {
return nil, err
}
return msg, nil
}