codec: simplify codec interface

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

codec/codec.go

@@ -3,17 +3,6 @@ package codec // import "go.unistack.org/micro/v3/codec"
 
 import (
 	"errors"
-	"io"
-
-	"go.unistack.org/micro/v3/metadata"
-)
-
-// Message types
-const (
-	Error MessageType = iota
-	Request
-	Response
-	Event
 )
 
 var (
@@ -32,42 +21,13 @@ var (
 	DefaultTagName = "codec"
 )
 
-// MessageType specifies message type for codec
-type MessageType int
-
-// Codec encodes/decodes various types of messages used within 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.
+// Codec encodes/decodes various types of messages.
 type Codec interface {
-	ReadHeader(r io.Reader, m *Message, mt MessageType) error
-	ReadBody(r io.Reader, v interface{}) error
-	Write(w io.Writer, m *Message, v interface{}) error
 	Marshal(v interface{}, opts ...Option) ([]byte, error)
 	Unmarshal(b []byte, v interface{}, opts ...Option) 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 {
-	Header   metadata.Metadata
-	Target   string
-	Method   string
-	Endpoint string
-	Error    string
-	ID       string
-	Body     []byte
-	Type     MessageType
-}
-
-// NewMessage creates new codec message
-func NewMessage(t MessageType) *Message {
-	return &Message{Type: t, Header: metadata.New(0)}
-}
-
 // MarshalAppend calls codec.Marshal(v) and returns the data appended to buf.
 // If codec implements MarshalAppend, that is called instead.
 func MarshalAppend(buf []byte, c Codec, v interface{}, opts ...Option) ([]byte, error) {
@@ -93,6 +53,8 @@ type RawMessage []byte
 func (m *RawMessage) MarshalJSON() ([]byte, error) {
 	if m == nil {
 		return []byte("null"), nil
+	} else if len(*m) == 0 {
+		return []byte("null"), nil
 	}
 	return *m, nil
 }

codec/noop.go

@@ -2,70 +2,14 @@ package codec
 
 import (
 	"encoding/json"
-	"io"
+
+	codecpb "go.unistack.org/micro-proto/v3/codec"
 )
 
 type noopCodec struct {
 	opts Options
 }
 
-func (c *noopCodec) ReadHeader(conn io.Reader, m *Message, t MessageType) error {
-	return nil
-}
-
-func (c *noopCodec) ReadBody(conn io.Reader, b interface{}) error {
-	// read bytes
-	buf, err := io.ReadAll(conn)
-	if err != nil {
-		return err
-	}
-
-	if b == nil {
-		return nil
-	}
-
-	switch v := b.(type) {
-	case *string:
-		*v = string(buf)
-	case *[]byte:
-		*v = buf
-	case *Frame:
-		v.Data = buf
-	default:
-		return json.Unmarshal(buf, v)
-	}
-
-	return nil
-}
-
-func (c *noopCodec) Write(conn io.Writer, m *Message, b interface{}) error {
-	if b == nil {
-		return nil
-	}
-
-	var v []byte
-	switch vb := b.(type) {
-	case *Frame:
-		v = vb.Data
-	case string:
-		v = []byte(vb)
-	case *string:
-		v = []byte(*vb)
-	case *[]byte:
-		v = *vb
-	case []byte:
-		v = vb
-	default:
-		var err error
-		v, err = json.Marshal(vb)
-		if err != nil {
-			return err
-		}
-	}
-	_, err := conn.Write(v)
-	return err
-}
-
 func (c *noopCodec) String() string {
 	return "noop"
 }
@@ -91,8 +35,8 @@ func (c *noopCodec) Marshal(v interface{}, opts ...Option) ([]byte, error) {
 		return ve, nil
 	case *Frame:
 		return ve.Data, nil
-	case *Message:
-		return ve.Body, nil
+	case *codecpb.Frame:
+		return ve.Data, nil
 	}
 
 	return json.Marshal(v)
@@ -115,8 +59,8 @@ func (c *noopCodec) Unmarshal(d []byte, v interface{}, opts ...Option) error {
 	case *Frame:
 		ve.Data = d
 		return nil
-	case *Message:
-		ve.Body = d
+	case *codecpb.Frame:
+		ve.Data = d
 		return nil
 	}
 

errors/errors.go

@@ -44,6 +44,20 @@ var (
 	ErrGatewayTimeout = &Error{Code: 504}
 )
 
+const ProblemContentType = "application/problem+json"
+
+type Problem struct {
+	Type     string `json:"type,omitempty"`
+	Title    string `json:"title,omitempty"`
+	Detail   string `json:"detail,omitempty"`
+	Instance string `json:"instance,omitempty"`
+	Errors   []struct {
+		Title  string `json:"title,omitempty"`
+		Detail string `json:"detail,omitempty"`
+	} `json:"errors,omitempty"`
+	Status int `json:"status,omitempty"`
+}
+
 // Error type
 type Error struct {
 	// ID holds error id or service, usually someting like my_service or id

logger/logger.go

@@ -1,5 +1,5 @@
 // Package logger provides a log interface
-package logger // import "go.unistack.org/micro/v3/logger"
+package logger
 
 import (
 	"context"

logger/options.go

@@ -74,7 +74,7 @@ func NewOptions(opts ...Option) Options {
 	return options
 }
 
-// WithContextAttrFuncs appends default funcs for the context arrts filler
+// WithContextAttrFuncs appends default funcs for the context attrs filler
 func WithContextAttrFuncs(fncs ...ContextAttrFunc) Option {
 	return func(o *Options) {
 		o.ContextAttrFuncs = append(o.ContextAttrFuncs, fncs...)
@@ -137,6 +137,13 @@ func WithName(n string) Option {
 	}
 }
 
+// WithMeter sets the meter
+func WithMeter(m meter.Meter) Option {
+	return func(o *Options) {
+		o.Meter = m
+	}
+}
+
 // WithTimeFunc sets the func to obtain current time
 func WithTimeFunc(fn func() time.Time) Option {
 	return func(o *Options) {

server/noop.go

@@ -1,7 +1,6 @@
 package server
 
 import (
-	"bytes"
 	"context"
 	"fmt"
 	"reflect"
@@ -691,7 +690,7 @@ func (n *noopServer) createSubHandler(sb *subscriber, opts Options) broker.Handl
 				req = req.Elem()
 			}
 
-			if err = cf.ReadBody(bytes.NewBuffer(msg.Body), req.Interface()); err != nil {
+			if err = cf.Unmarshal(msg.Body, req.Interface()); err != nil {
 				return err
 			}
 

tracer/options.go

@@ -140,6 +140,8 @@ type Options struct {
 	Logger logger.Logger
 	// Name of the tracer
 	Name string
+	// ContextAttrFuncs contains funcs that provides tracing
+	ContextAttrFuncs []ContextAttrFunc
 }
 
 // Option func signature
@@ -176,8 +178,9 @@ func NewSpanOptions(opts ...SpanOption) SpanOptions {
 // NewOptions returns default options
 func NewOptions(opts ...Option) Options {
 	options := Options{
-		Logger:  logger.DefaultLogger,
-		Context: context.Background(),
+		Logger:           logger.DefaultLogger,
+		Context:          context.Background(),
+		ContextAttrFuncs: DefaultContextAttrFuncs,
 	}
 	for _, o := range opts {
 		o(&options)

tracer/tracer.go

@@ -21,8 +21,11 @@ var (
 		"HealthService.Ready",
 		"HealthService.Version",
 	}
+	DefaultContextAttrFuncs []ContextAttrFunc
 )
 
+type ContextAttrFunc func(ctx context.Context) []interface{}
+
 func init() {
 	logger.DefaultContextAttrFuncs = append(logger.DefaultContextAttrFuncs,
 		func(ctx context.Context) []interface{} {

util/sort/sort_test.go

@@ -0,0 +1,60 @@
+package sort
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestUniq(t *testing.T) {
+	type args struct {
+		labels []interface{}
+	}
+
+	tests := []struct {
+		name string
+		args args
+		want []interface{}
+	}{
+		{
+			name: "test#1",
+			args: args{
+				labels: append(make([]interface{}, 0), "test-1", 1, "test-2", 2),
+			},
+			want: append(make([]interface{}, 0), "test-1", 1, "test-2", 2),
+		},
+		{
+			name: "test#2",
+			args: args{
+				labels: append(make([]interface{}, 0), "test-1", 1, "test-2", 2, "test-2", 2),
+			},
+			want: append(make([]interface{}, 0), "test-1", 1, "test-2", 2),
+		},
+		{
+			name: "test#3",
+			args: args{
+				labels: append(make([]interface{}, 0), "test-1", 1, "test-2", 2, "test-2", 3),
+			},
+			want: append(make([]interface{}, 0), "test-1", 1, "test-2", 3),
+		},
+		{
+			name: "test#4",
+			args: args{
+				labels: append(make([]interface{}, 0),
+					"test-1", 1, "test-1", 2,
+					"test-2", 3, "test-2", 2,
+					"test-3", 5, "test-3", 3,
+					"test-1", 4, "test-1", 1),
+			},
+			want: append(make([]interface{}, 0), "test-1", 1, "test-2", 2, "test-3", 3),
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			var got []interface{}
+			if got = Uniq(tt.args.labels); !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("Uniq() = %v, want %v", got, tt.want)
+			}
+			t.Logf("got-%#v", got)
+		})
+	}
+}

util/xpool/pool.go

@@ -1,6 +1,9 @@
 package pool
 
-import "sync"
+import (
+	"bytes"
+	"sync"
+)
 
 type Pool[T any] struct {
 	p *sync.Pool
@@ -23,3 +26,11 @@ func (p Pool[T]) Get() T {
 func (p Pool[T]) Put(t T) {
 	p.p.Put(t)
 }
+
+func NewBytePool(size int) Pool[[]byte] {
+	return NewPool(func() []byte { return make([]byte, size) })
+}
+
+func NewBytesPool() Pool[*bytes.Buffer] {
+	return NewPool(func() *bytes.Buffer { return bytes.NewBuffer(nil) })
+}