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net.go
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/*
The MIT License (MIT)
Copyright (c) 2015 Nirbhay Choubey
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
package mysql
import (
"net"
)
// dial opens a connection with the server; prefer socket if specified.
func dial(address, socket string) (net.Conn, error) {
var (
c net.Conn
addr string
network string
err error
)
if socket != "" {
network, addr = "socket", socket
} else {
network, addr = "tcp", address
}
if c, err = net.Dial(network, addr); err != nil {
return nil, myError(ErrConnection, err)
}
return c, nil
}
// readWriter is a generic interface to read/write protocol packets to/from
// the network.
type readWriter interface {
// init initializes the readWriter
init(c *Conn)
// read reads the specified number of bytes from the network and stores
// them into the specified buffer.
read(b []byte, length int) (int, error)
// write writes the contents of the specified buffer to the network.
write([]byte) (int, error)
// reset can be used to performs some reset operations.
reset()
}
// defaultReadWrited implements readWriter for non-compressed network
// read/write.
type defaultReadWriter struct {
c *Conn
}
// init is no-op.
func (rw *defaultReadWriter) init(c *Conn) {
rw.c = c
}
// read reads the specified number of bytes from the network and stores them
// into the connection buffer.
func (rw *defaultReadWriter) read(b []byte, length int) (int, error) {
return rw.c.netRead(b[0:length])
}
// write writes the contents of the specified buffer to network.
func (rw *defaultReadWriter) write(b []byte) (int, error) {
return rw.c.netWrite(b)
}
// reset is no-op.
func (rw *defaultReadWriter) reset() {
}
// netRead reads len(b) number of bytes from network and stores into the
// given buffer.
func (c *Conn) netRead(b []byte) (int, error) {
var (
n, cur, end int
err error
)
end = len(b)
for {
if n, err = c.conn.Read(b[cur:end]); err != nil {
cur += n
return cur, myError(ErrRead, err)
}
cur += n
if cur == end {
break
}
}
return end, nil
}
// netWrite writes the contents of the given buffer to the network.
func (c *Conn) netWrite(b []byte) (int, error) {
var (
n, cur, end int
err error
)
end = len(b)
for {
if n, err = c.conn.Write(b[cur:end]); err != nil {
cur += n
return cur, myError(ErrWrite, err)
}
cur += n
if cur == end {
break
}
}
return end, nil
}