Initial QSfera import

Server/vendor/go-micro.dev/v4/codec/codec.go

@@ -0,0 +1,69 @@
+// Package codec is an interface for encoding messages
+package codec
+
+import (
+	"errors"
+	"io"
+)
+
+const (
+	Error MessageType = iota
+	Request
+	Response
+	Event
+)
+
+var (
+	ErrInvalidMessage = errors.New("invalid message")
+)
+
+type MessageType int
+
+// Takes in a connection/buffer and returns a new Codec.
+type NewCodec func(io.ReadWriteCloser) Codec
+
+// Codec encodes/decodes various types of messages used within go-micro.
+// ReadHeader and ReadBody are called in pairs to read requests/responses
+// from the connection. Close is called when finished with the
+// connection. ReadBody may be called with a nil argument to force the
+// body to be read and discarded.
+type Codec interface {
+	Reader
+	Writer
+	Close() error
+	String() string
+}
+
+type Reader interface {
+	ReadHeader(*Message, MessageType) error
+	ReadBody(interface{}) error
+}
+
+type Writer interface {
+	Write(*Message, interface{}) error
+}
+
+// Marshaler is a simple encoding interface used for the broker/transport
+// where headers are not supported by the underlying implementation.
+type Marshaler interface {
+	Marshal(interface{}) ([]byte, error)
+	Unmarshal([]byte, interface{}) error
+	String() string
+}
+
+// Message represents detailed information about
+// the communication, likely followed by the body.
+// In the case of an error, body may be nil.
+type Message struct {
+
+	// The values read from the socket
+	Header   map[string]string
+	Id       string
+	Target   string
+	Method   string
+	Endpoint string
+	Error    string
+
+	Body []byte
+	Type MessageType
+}