update protocol handling

server/client_resp.go

@@ -37,6 +37,7 @@ func newClientRESP(conn net.Conn, app *App) {
 		tcpConn.SetReadBuffer(app.cfg.ConnReadBufferSize)
 		tcpConn.SetWriteBuffer(app.cfg.ConnWriteBufferSize)
 	}
+
 	c.rb = bufio.NewReaderSize(conn, app.cfg.ConnReadBufferSize)
 
 	c.resp = newWriterRESP(conn, app.cfg.ConnWriteBufferSize)
@@ -85,57 +86,93 @@ func (c *respClient) readLine() ([]byte, error) {
 }
 
 //A client sends to the Redis server a RESP Array consisting of just Bulk Strings.
+// func (c *respClient) readRequest() ([][]byte, error) {
+// 	l, err := c.readLine()
+// 	if err != nil {
+// 		return nil, err
+// 	} else if len(l) == 0 || l[0] != '*' {
+// 		return nil, errReadRequest
+// 	}
+
+// 	var nparams int
+// 	if nparams, err = strconv.Atoi(hack.String(l[1:])); err != nil {
+// 		return nil, err
+// 	} else if nparams <= 0 {
+// 		return nil, errReadRequest
+// 	}
+
+// 	req := make([][]byte, 0, nparams)
+// 	var n int
+// 	for i := 0; i < nparams; i++ {
+// 		if l, err = c.readLine(); err != nil {
+// 			return nil, err
+// 		}
+
+// 		if len(l) == 0 {
+// 			return nil, errReadRequest
+// 		} else if l[0] == '$' {
+// 			//handle resp string
+// 			if n, err = strconv.Atoi(hack.String(l[1:])); err != nil {
+// 				return nil, err
+// 			} else if n == -1 {
+// 				req = append(req, nil)
+// 			} else {
+// 				buf := make([]byte, n+2)
+// 				if _, err = io.ReadFull(c.rb, buf); err != nil {
+// 					return nil, err
+// 				}
+
+// 				if buf[len(buf)-2] != '\r' && buf[len(buf)-1] != '\n' {
+// 					return nil, errors.New("bad bulk string format")
+// 				}
+
+// 				// if l, err = c.readLine(); err != nil {
+// 				// 	return nil, err
+// 				// } else if len(l) != 0 {
+// 				// 	return nil, errors.New("bad bulk string format")
+// 				// }
+
+// 				req = append(req, buf[0:len(buf)-2])
+
+// 			}
+
+// 		} else {
+// 			return nil, errReadRequest
+// 		}
+// 	}
+
+// 	return req, nil
+// }
+
 func (c *respClient) readRequest() ([][]byte, error) {
-	l, err := c.readLine()
+	code, err := c.rb.ReadByte()
 	if err != nil {
 		return nil, err
-	} else if len(l) == 0 || l[0] != '*' {
+	}
+
+	if code != '*' {
 		return nil, errReadRequest
 	}
 
-	var nparams int
-	if nparams, err = strconv.Atoi(hack.String(l[1:])); err != nil {
+	var nparams int64
+	if nparams, err = readLong(c.rb); err != nil {
 		return nil, err
 	} else if nparams <= 0 {
 		return nil, errReadRequest
 	}
 
-	req := make([][]byte, 0, nparams)
-	var n int
-	for i := 0; i < nparams; i++ {
-		if l, err = c.readLine(); err != nil {
+	req := make([][]byte, nparams)
+	for i := range req {
+		if code, err = c.rb.ReadByte(); err != nil {
 			return nil, err
-		}
-
-		if len(l) == 0 {
-			return nil, errReadRequest
-		} else if l[0] == '$' {
-			//handle resp string
-			if n, err = strconv.Atoi(hack.String(l[1:])); err != nil {
-				return nil, err
-			} else if n == -1 {
-				req = append(req, nil)
-			} else {
-				buf := make([]byte, n)
-				if _, err = io.ReadFull(c.rb, buf); err != nil {
-					return nil, err
-				}
-
-				if l, err = c.readLine(); err != nil {
-					return nil, err
-				} else if len(l) != 0 {
-					return nil, errors.New("bad bulk string format")
-				}
-
-				req = append(req, buf)
-
-			}
-
-		} else {
+		} else if code != '$' {
 			return nil, errReadRequest
 		}
-	}
 
+		if req[i], err = readBytes(c.rb); err != nil {
+			return nil, err
+		}
+	}
 	return req, nil
 }
 

server/util.go

@@ -3,6 +3,8 @@ package server
 import (
 	"bufio"
 	"errors"
+	"fmt"
+	"io"
 )
 
 var (
@@ -19,5 +21,71 @@ func ReadLine(rb *bufio.Reader) ([]byte, error) {
 	if i < 0 || p[i] != '\r' {
 		return nil, errLineFormat
 	}
+
 	return p[:i], nil
 }
+
+func readBytes(br *bufio.Reader) (bytes []byte, err error) {
+	size, err := readLong(br)
+	if err != nil {
+		return nil, err
+	}
+	if size == -1 {
+		return nil, nil
+	}
+	if size < 0 {
+		return nil, errors.New("Invalid size: " + fmt.Sprint("%d", size))
+	}
+
+	buf := make([]byte, size+2)
+	if _, err = io.ReadFull(br, buf); err != nil {
+		return nil, err
+	}
+
+	if buf[len(buf)-2] != '\r' && buf[len(buf)-1] != '\n' {
+		return nil, errors.New("bad bulk string format")
+	}
+
+	bytes = buf[0 : len(buf)-2]
+
+	return
+}
+
+func readLong(in *bufio.Reader) (result int64, err error) {
+	read, err := in.ReadByte()
+	if err != nil {
+		return -1, err
+	}
+	var sign int
+	if read == '-' {
+		read, err = in.ReadByte()
+		if err != nil {
+			return -1, err
+		}
+		sign = -1
+	} else {
+		sign = 1
+	}
+	var number int64
+	for number = 0; err == nil; read, err = in.ReadByte() {
+		if read == '\r' {
+			read, err = in.ReadByte()
+			if err != nil {
+				return -1, err
+			}
+			if read == '\n' {
+				return number * int64(sign), nil
+			} else {
+				return -1, errors.New("Bad line ending")
+			}
+		}
+		value := read - '0'
+		if value >= 0 && value < 10 {
+			number *= 10
+			number += int64(value)
+		} else {
+			return -1, errors.New("Invalid digit")
+		}
+	}
+	return -1, err
+}