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proxy.go
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proxy.go
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package proxy
import (
"bytes"
"encoding/binary"
"fmt"
"io"
"net"
"os"
"strings"
"time"
"github.com/DimShadoWWW/power-pg/common"
"github.com/op/go-logging"
)
var (
connid = uint64(0)
)
// Pkg PostgreSQL package structure
type Pkg struct {
Type byte
Content []byte
Time time.Duration
}
// Start function
func Start(localHost, remoteHost *string, remotePort *string, msgBytes chan []byte, msgCh chan Pkg, recreate bool, log *logging.Logger) {
fmt.Printf("Proxying from %v to %v\n", localHost, remoteHost)
localAddr, remoteAddr := getResolvedAddresses(localHost, remoteHost, remotePort)
listener := getListener(localAddr)
for {
conn, err := listener.AcceptTCP()
if err != nil {
fmt.Printf("Failed to accept connection '%s'\n", err)
continue
}
connid++
p := &proxy{
lconn: *conn,
laddr: localAddr,
raddr: remoteAddr,
erred: false,
errsig: make(chan bool),
prefix: fmt.Sprintf("Connection #%03d ", connid),
log: log,
}
go p.start(msgBytes, msgCh, recreate)
}
}
func getResolvedAddresses(localHost, remoteHost, remotePort *string) (*net.TCPAddr, *net.TCPAddr) {
laddr, err := net.ResolveTCPAddr("tcp", *localHost)
check(err)
raddr, err := net.ResolveTCPAddr("tcp", fmt.Sprintf("%s:%s", *remoteHost, *remotePort))
check(err)
return laddr, raddr
}
func getListener(addr *net.TCPAddr) *net.TCPListener {
listener, err := net.ListenTCP("tcp", addr)
check(err)
return listener
}
type proxy struct {
sentBytes uint64
receivedBytes uint64
laddr, raddr *net.TCPAddr
lconn, rconn net.TCPConn
erred bool
errsig chan bool
prefix string
result *[]string
log *logging.Logger
}
func (p *proxy) err(s string, err error) {
if p.erred {
return
}
if err != io.EOF {
warn(p.prefix+s, err)
}
p.errsig <- true
p.erred = true
}
func (p *proxy) start(msgBytes chan []byte, msgCh chan Pkg, recreate bool) {
// defer p.lconn.conn.Close()
//connect to remote
rconn, err := net.DialTCP("tcp", nil, p.raddr)
if err != nil {
p.err("Remote connection failed: %s", err)
return
}
p.rconn = *rconn
// p.rconn.alive = true
// defer p.rconn.conn.Close()
//bidirectional copy
go p.pipe(p.lconn, p.rconn, msgBytes, msgCh, recreate, p.log)
go p.pipe(p.rconn, p.lconn, nil, nil, recreate, p.log)
//wait for close...
<-p.errsig
}
func (p *proxy) pipe(src, dst net.TCPConn, msgBytes chan []byte, msgCh chan Pkg, recreate bool, log *logging.Logger) {
//data direction
islocal := src == p.lconn
//directional copy (64k buffer)
buff := make(ReadBuf, 0xffff)
// spaces := regexp.MustCompile("[\n\t ]+")
if islocal {
lastExecTime := time.Now()
for {
remainingBytes := 0
var r ReadBuf
n, err := src.Read(buff)
if err != nil {
p.err("Read failed '%s'\n", err)
return
}
now := time.Now()
// if msgBytes != nil {
// log.Debug("Readed bytes: %d\n", n)
// }
b := buff[:n]
// log.Info("Readed: %v\n", b)
msgBytes <- b
//write out result
if !recreate {
n, err = dst.Write(b)
if err != nil {
p.err("Write failed '%s'\n", err)
return
}
}
r = buff[:n]
// log.Debug("PostgreSQL full message: %s\n", string(r))
// // log.Debug("Remaining bytes: %d\n", remainingBytes)
// log.Debug("len(r) : %v\n", len(r))
// fmt.Println("3")
if len(r) > 4 {
// fmt.Println("4")
// log.Debug("2 Remaining bytes: %d\n", remainingBytes)
var msg []byte
// log.Debug("1 n: %d\n", n)
t := r.Byte()
// fmt.Println("t: ", string(t))
switch t {
// case 'Q', 'B', 'C', 'd', 'c', 'f', 'D', 'E', 'H', 'F', 'P', 'p', 'S', 'X':
case 'B', 'P':
log.Debug("PostgreSQL pkg type: %s\n", string(t))
remainingBytes = r.Int32() - 4
r = r[:remainingBytes]
if remainingBytes < 4 {
fmt.Println("ERROR: remainingBytes can't be less than 4 bytes if int32")
} else {
if remainingBytes > 0 {
msg = append(msg, r.Next(remainingBytes)[:]...)
msgCh <- Pkg{
Type: t,
Content: msg,
Time: now.Sub(lastExecTime),
}
}
}
case 'Q':
if !bytes.Contains(r, []byte("DEALLOCATE")) {
log.Debug("PostgreSQL pkg type: %s\n", string(t))
remainingBytes = r.Int32() - 4
r = r[:remainingBytes]
msgCh <- Pkg{
Type: t,
Content: r,
Time: now.Sub(lastExecTime),
}
}
}
}
lastExecTime = now
log.Debug("Going to next query\n")
// fmt.Println("8")
}
} else {
for {
n, err := src.Read(buff)
if err != nil {
p.err("Read failed '%s'\n", err)
return
}
b := buff[:n]
//write out result
n, err = dst.Write(b)
if err != nil {
p.err("Write failed '%s'\n", err)
return
}
if err != nil {
p.err("Write failed '%s'\n", err)
return
}
}
}
}
func getModifiedBuffer(buffer []byte, powerCallback common.Callback) []byte {
if powerCallback == nil || len(buffer) < 1 || string(buffer[0]) != "Q" || string(buffer[5:11]) != "power:" {
return buffer
}
query := powerCallback(string(buffer[5:]))
return makeMessage(query)
}
func makeMessage(query string) []byte {
queryArray := make([]byte, 0, 6+len(query))
queryArray = append(queryArray, 'Q', 0, 0, 0, 0)
queryArray = append(queryArray, query...)
queryArray = append(queryArray, 0)
binary.BigEndian.PutUint32(queryArray[1:], uint32(len(queryArray)-1))
return queryArray
}
func check(err error) {
if err != nil {
warn(err.Error())
os.Exit(1)
}
}
func warn(f string, args ...interface{}) {
fmt.Printf(f+"\n", args...)
}
func stripchars(str, chr string) string {
return strings.Map(func(r rune) rune {
if strings.IndexRune(chr, r) < 0 {
return r
}
return -1
}, str)
}