parser: greatly simplify reply parsing.

redis.go

@@ -2,16 +2,11 @@ package redis
 
 import (
 	"crypto/tls"
-	"errors"
 	"io"
 	"net"
 	"sync"
 )
 
-var (
-	ErrReaderTooSmall = errors.New("redis: Reader is too small")
-)
-
 type OpenConnFunc func() (io.ReadWriteCloser, error)
 type CloseConnFunc func(io.ReadWriteCloser) error
 type InitConnFunc func(*Client) error
@@ -110,7 +105,11 @@ func (c *BaseClient) Run(req Req) {
 
 	val, err := req.ParseReply(conn.Rd)
 	if err != nil {
-		c.ConnPool.Add(conn)
+		if err == Nil {
+			c.ConnPool.Add(conn)
+		} else {
+			c.ConnPool.Remove(conn)
+		}
 		req.SetErr(err)
 		return
 	}