Package Socket:

- fix tcp,udp,unix socket
- add socket unixgram for session less unix socket
- optmize process & code
- add some standalone test for server / client (add example server config for
  rsyslog)

Package Network/Protocol:
- add unixgram protocol

Package Errors:
- fix bug in loop to prevent circular include

socket/client/unix/model.go

@@ -30,27 +30,25 @@
 package unix
 
 import (
-	"bytes"
+	"bufio"
 	"context"
+	"errors"
 	"io"
 	"net"
-	"os"
 	"sync/atomic"
 
 	libptc "github.com/nabbar/golib/network/protocol"
 	libsck "github.com/nabbar/golib/socket"
 )
 
-type cltx struct {
-	a  *atomic.Value // address : unixfile
-	s  *atomic.Int32 // buffer size
-	e  *atomic.Value // function error
-	i  *atomic.Value // function info
-	tr *atomic.Value // connection read timeout
-	tw *atomic.Value // connection write timeout
+type cli struct {
+	a *atomic.Value // address : unixfile
+	s *atomic.Int32 // buffer size
+	e *atomic.Value // function error
+	i *atomic.Value // function info
 }
 
-func (o *cltx) RegisterFuncError(f libsck.FuncError) {
+func (o *cli) RegisterFuncError(f libsck.FuncError) {
 	if o == nil {
 		return
 	}
@@ -58,7 +56,7 @@ func (o *cltx) RegisterFuncError(f libsck.FuncError) {
 	o.e.Store(f)
 }
 
-func (o *cltx) RegisterFuncInfo(f libsck.FuncInfo) {
+func (o *cli) RegisterFuncInfo(f libsck.FuncInfo) {
 	if o == nil {
 		return
 	}
@@ -66,7 +64,7 @@ func (o *cltx) RegisterFuncInfo(f libsck.FuncInfo) {
 	o.i.Store(f)
 }
 
-func (o *cltx) fctError(e error) {
+func (o *cli) fctError(e error) {
 	if o == nil {
 		return
 	}
@@ -77,7 +75,7 @@ func (o *cltx) fctError(e error) {
 	}
 }
 
-func (o *cltx) fctInfo(local, remote net.Addr, state libsck.ConnState) {
+func (o *cli) fctInfo(local, remote net.Addr, state libsck.ConnState) {
 	if o == nil {
 		return
 	}
@@ -88,84 +86,115 @@ func (o *cltx) fctInfo(local, remote net.Addr, state libsck.ConnState) {
 	}
 }
 
-func (o *cltx) buffRead() *bytes.Buffer {
+func (o *cli) buffSize() int {
 	v := o.s.Load()
 	if v > 0 {
-		return bytes.NewBuffer(make([]byte, 0, int(v)))
+		return int(v)
 	}
 
-	return bytes.NewBuffer(make([]byte, 0, libsck.DefaultBufferSize))
+	return libsck.DefaultBufferSize
 }
 
-func (o *cltx) dial(ctx context.Context) (net.Conn, error) {
+func (o *cli) dial(ctx context.Context) (net.Conn, error) {
 	if o == nil {
-		return nil, ErrInvalidInstance
+		return nil, ErrInstance
 	}
 
 	v := o.a.Load()
+
 	if v == nil {
-		return nil, ErrUnixFile
-	} else if _, e := os.Stat(v.(string)); e != nil {
-		return nil, e
+		return nil, ErrAddress
+	} else if adr, ok := v.(string); !ok {
+		return nil, ErrAddress
 	} else {
 		d := net.Dialer{}
-		return d.DialContext(ctx, libptc.NetworkUnix.Code(), v.(string))
+		return d.DialContext(ctx, libptc.NetworkUnix.Code(), adr)
 	}
 }
 
-func (o *cltx) Do(ctx context.Context, request io.Reader, fct libsck.Response) error {
+func (o *cli) Do(ctx context.Context, request io.Reader, fct libsck.Response) error {
 	if o == nil {
-		return ErrInvalidInstance
+		return ErrInstance
 	}
 
 	var (
-		e   error
-		lc  net.Addr
-		rm  net.Addr
+		err error
 		cnn net.Conn
 	)
 
-	o.fctInfo(nil, nil, libsck.ConnectionDial)
-	if cnn, e = o.dial(ctx); e != nil {
-		o.fctError(e)
-		return e
-	}
-
 	defer func() {
-		err := cnn.Close()
-		o.fctError(err)
+		if cnn != nil {
+			o.fctInfo(cnn.LocalAddr(), cnn.RemoteAddr(), libsck.ConnectionClose)
+			o.fctError(cnn.Close())
+		}
 	}()
 
-	lc = cnn.LocalAddr()
-	rm = cnn.RemoteAddr()
-
-	defer o.fctInfo(lc, rm, libsck.ConnectionClose)
-	o.fctInfo(lc, rm, libsck.ConnectionNew)
-
-	if request != nil {
-		o.fctInfo(lc, rm, libsck.ConnectionWrite)
-		if _, e = io.Copy(cnn, request); e != nil {
-			o.fctError(e)
-			return e
-		}
+	o.fctInfo(&net.UnixAddr{}, &net.UnixAddr{}, libsck.ConnectionDial)
+	if cnn, err = o.dial(ctx); err != nil {
+		o.fctError(err)
+		return err
 	}
 
-	o.fctInfo(lc, rm, libsck.ConnectionCloseWrite)
-	if e = cnn.(*net.UnixConn).CloseWrite(); e != nil {
-		o.fctError(e)
-		return e
-	}
+	o.fctInfo(cnn.LocalAddr(), cnn.RemoteAddr(), libsck.ConnectionNew)
 
-	o.fctInfo(lc, rm, libsck.ConnectionHandler)
-	if fct != nil {
-		fct(cnn)
-	}
-
-	o.fctInfo(lc, rm, libsck.ConnectionCloseRead)
-	if e = cnn.(*net.UnixConn).CloseRead(); e != nil {
-		o.fctError(e)
-		return e
-	}
+	o.sendRequest(cnn, request)
+	o.readResponse(cnn, fct)
 
 	return nil
 }
+
+func (o *cli) sendRequest(con net.Conn, r io.Reader) {
+	var (
+		err error
+		buf []byte
+		rdr = bufio.NewReaderSize(r, o.buffSize())
+		wrt = bufio.NewWriterSize(con, o.buffSize())
+	)
+
+	defer func() {
+		if con != nil {
+			if c, ok := con.(*net.UnixConn); ok {
+				o.fctInfo(con.LocalAddr(), con.RemoteAddr(), libsck.ConnectionCloseWrite)
+				_ = c.CloseWrite()
+			}
+		}
+	}()
+
+	for {
+		if con == nil && r == nil {
+			return
+		}
+
+		buf, err = rdr.ReadBytes('\n')
+
+		if err != nil {
+			if !errors.Is(err, io.EOF) {
+				o.fctError(err)
+			}
+			return
+		}
+
+		o.fctInfo(con.LocalAddr(), con.RemoteAddr(), libsck.ConnectionWrite)
+
+		_, err = wrt.Write(buf)
+		if err != nil {
+			o.fctError(err)
+			return
+		}
+
+		err = wrt.Flush()
+		if err != nil {
+			o.fctError(err)
+			return
+		}
+	}
+}
+
+func (o *cli) readResponse(con net.Conn, f libsck.Response) {
+	if f == nil {
+		return
+	}
+
+	o.fctInfo(con.LocalAddr(), con.RemoteAddr(), libsck.ConnectionHandler)
+	f(con)
+}