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codec.go
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codec.go
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// MIT License
//
// Copyright (c) 2020 Lack
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package codec
import (
"errors"
"io"
)
const (
Error MessageType = iota
Request
Response
Event
)
var (
ErrInvalidMessage = errors.New("invalid message")
)
type MessageType int
// NewCodec takes in a connection/buffer and returns a new Codec
type NewCodec func(closer io.ReadWriteCloser) Codec
// Codec encodes/decodes various types of messages used within vine
// ReadHeader and ReadBody are called in pair 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 ued 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 {
Id string
Type MessageType
Target string
Method string
Endpoint string
Error string
// The values read from the socket
Header map[string]string
Body []byte
}