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redfi.go
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redfi.go
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package redfi
import (
"fmt"
"io"
"log"
"net"
"sync"
"time"
pool "gopkg.in/fatih/pool.v2"
)
type Proxy struct {
server string
plan *Plan
addr string
connPool pool.Pool
}
func factory(server string) func() (net.Conn, error) {
return func() (net.Conn, error) {
return net.Dial("tcp", server)
}
}
func New(planPath, server, addr string) (*Proxy, error) {
p, err := pool.NewChannelPool(5, 30, factory(server))
if err != nil {
return nil, err
}
// parse the failures plan
plan, err := Parse(planPath)
if err != nil {
return nil, err
}
return &Proxy{
server: server,
connPool: p,
plan: plan,
addr: addr,
}, nil
}
func (p *Proxy) Start() error {
ln, err := net.Listen("tcp", p.addr)
if err != nil {
log.Fatal(err)
}
fmt.Println("RedFI is listening on ", p.addr)
fmt.Println("Don't forget to point your client to that address.")
for {
conn, err := ln.Accept()
if err != nil {
log.Println(err)
continue
}
go p.handle(conn)
}
}
func (p *Proxy) handle(conn net.Conn) {
var wg sync.WaitGroup
targetConn, err := p.connPool.Get()
if err != nil {
log.Fatal("failed to get a connection from connPool")
}
wg.Add(2)
go func() {
p.faulter(targetConn, conn)
wg.Done()
}()
go func() {
p.pipe(conn, targetConn)
wg.Done()
}()
wg.Wait()
log.Println("Close connection", conn.Close())
}
func (p *Proxy) pipe(dst, src net.Conn) {
buf := make([]byte, 32<<10)
for {
n, err := src.Read(buf)
if err != nil && err == io.EOF {
break
}
if err != nil {
log.Println(err)
continue
}
// @TODO(kl): check if written is less than what's in buf
_, err = dst.Write(buf[:n])
if err != nil {
log.Println(err)
continue
}
}
}
func (p *Proxy) faulter(dst, src net.Conn) {
buf := make([]byte, 32<<10)
for {
n, err := src.Read(buf)
if err != nil && err == io.EOF {
break
}
if err != nil {
log.Println(err)
continue
}
rule := p.plan.SelectRule(src.RemoteAddr().String(), buf)
if rule != nil {
if rule.Delay > 0 {
time.Sleep(time.Duration(rule.Delay) * time.Millisecond)
}
if rule.Drop {
err = src.Close()
if err != nil {
log.Println("encountered error while closing srcConn", err)
}
break
}
if rule.ReturnEmpty {
_, err = dst.Write([]byte("$-1\r\n"))
if err != nil {
log.Println(err)
}
continue
}
}
_, err = dst.Write(buf[:n])
if err != nil {
log.Println(err)
continue
}
}
}