75 lines
1.7 KiB
Go
75 lines
1.7 KiB
Go
// Package codec is an interface for encoding messages
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package codec
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import (
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"errors"
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"io"
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"github.com/unistack-org/micro/v3/metadata"
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)
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const (
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Error MessageType = iota
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Request
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Response
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Event
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)
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var (
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// ErrInvalidMessage returned when invalid messge passed to codec
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ErrInvalidMessage = errors.New("invalid message")
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)
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// MessageType
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type MessageType int
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// NewCodec takes in a connection/buffer and returns a new Codec
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type NewCodec func(io.ReadWriteCloser) Codec
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// Codec encodes/decodes various types of messages used within go-micro.
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// ReadHeader and ReadBody are called in pairs to read requests/responses
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// from the connection. Close is called when finished with the
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// connection. ReadBody may be called with a nil argument to force the
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// body to be read and discarded.
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type Codec interface {
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Reader
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Writer
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Close() error
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String() string
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}
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// Reader interface
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type Reader interface {
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ReadHeader(*Message, MessageType) error
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ReadBody(interface{}) error
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}
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// Writer interface
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type Writer interface {
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Write(*Message, interface{}) error
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}
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// Marshaler is a simple encoding interface used for the broker/transport
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// where headers are not supported by the underlying implementation.
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type Marshaler interface {
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Marshal(interface{}) ([]byte, error)
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Unmarshal([]byte, interface{}) error
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String() string
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}
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// Message represents detailed information about
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// the communication, likely followed by the body.
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// In the case of an error, body may be nil.
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type Message struct {
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Id string
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Type MessageType
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Target string
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Method string
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Endpoint string
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Error string
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// The values read from the socket
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Header metadata.Metadata
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Body []byte
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}
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