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fuzzer.go
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fuzzer.go
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package fuzzer
import (
"bytes"
"fmt"
"io"
"log"
"net"
"net/http"
"runtime"
"time"
"github.com/building-microservices-with-go/chapter8/validation"
)
var (
logpipe = &LogPipe{c: make(chan []byte, 1000)}
ln = MyListener(make(chan *MyConn))
)
func init() {
http.HandleFunc("/", validation.Handler)
s := &http.Server{
ErrorLog: log.New(logpipe, "", 0),
}
go func() {
if err := s.Serve(ln); err != nil {
panic(err)
}
}()
}
// Fuzz is the main entry point for the fuzzer package
func Fuzz(data []byte) int {
c := &MyConn{data: data, done: make(chan bool)}
ln <- c
<-c.done
http.DefaultTransport.(*http.Transport).CloseIdleConnections()
runtime.Gosched()
if data := logpipe.ReadAll(); bytes.Contains(data, []byte("http: panic serving")) {
fmt.Printf("%s\n", data)
panic("serving panicked")
}
if runtime.NumGoroutine() > 50 {
panic("leaking goroutines")
}
if c.written {
return 1
}
return 0
}
type MyListener chan *MyConn
func (ln MyListener) Accept() (c net.Conn, err error) {
return <-ln, nil
}
func (ln MyListener) Close() error {
return nil
}
func (ln MyListener) Addr() net.Addr {
return &net.TCPAddr{net.IP{127, 0, 0, 1}, 49706, ""}
}
type MyConn struct {
data []byte
done chan bool
written bool
}
func (c *MyConn) Read(b []byte) (n int, err error) {
if len(c.data) == 0 {
return 0, io.EOF
}
n = copy(b, c.data)
c.data = c.data[n:]
return
}
func (c *MyConn) Write(b []byte) (n int, err error) {
c.written = true
return len(b), nil
}
func (c *MyConn) Close() error {
close(c.done)
return nil
}
func (c *MyConn) LocalAddr() net.Addr {
return &net.TCPAddr{net.IP{127, 0, 0, 1}, 49706, ""}
}
func (c *MyConn) RemoteAddr() net.Addr {
return &net.TCPAddr{net.IP{127, 0, 0, 1}, 49706, ""}
}
func (c *MyConn) SetDeadline(t time.Time) error {
return nil
}
func (c *MyConn) SetReadDeadline(t time.Time) error {
return nil
}
func (c *MyConn) SetWriteDeadline(t time.Time) error {
return nil
}
type LogPipe struct {
c chan []byte
}
func (p *LogPipe) Write(data []byte) (int, error) {
p.c <- append([]byte{}, data...)
return len(data), nil
}
func (p *LogPipe) ReadAll() []byte {
var data []byte
for {
select {
case d := <-p.c:
data = append(data, d...)
default:
return data
}
}
}