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package dnstap
import (
"fmt"
"net"
"os"
"testing"
"time"
)
type testLogger struct{ *testing.T }
func (t *testLogger) Printf(format string, v ...interface{}) {
t.Helper()
t.Logf(format, v...)
}
func dialAndSend(t *testing.T, network, address string) *FrameStreamSockOutput {
var addr net.Addr
var err error
switch network {
case "unix":
addr, err = net.ResolveUnixAddr(network, address)
case "tcp", "tcp4", "tcp6":
addr, err = net.ResolveTCPAddr(network, address)
default:
err = fmt.Errorf("invalid network %s", network)
}
if err != nil {
t.Fatal(err)
}
out, err := NewFrameStreamSockOutput(addr)
if err != nil {
t.Fatal(err)
}
out.SetDialer(&net.Dialer{Timeout: time.Second})
out.SetTimeout(time.Second)
out.SetFlushTimeout(100 * time.Millisecond)
out.SetRetryInterval(time.Second)
out.SetLogger(&testLogger{t})
go out.RunOutputLoop()
<-time.After(500 * time.Millisecond)
out.GetOutputChannel() <- []byte("frame")
return out
}
func readOne(t *testing.T, out chan []byte) {
select {
case <-out:
case <-time.After(time.Second):
t.Fatal("timed out waiting for frame")
}
}
// Test if dnstap can accept multiple connections on the socket
func TestMultiConn(t *testing.T) {
in, err := NewFrameStreamSockInputFromPath("dnstap.sock")
if err != nil {
t.Fatal(err)
}
defer os.Remove("dnstap.sock")
in.SetLogger(&testLogger{t})
out := make(chan []byte)
go in.ReadInto(out)
// send two framestream messages on different connections
defer dialAndSend(t, "unix", "dnstap.sock").Close()
defer dialAndSend(t, "unix", "dnstap.sock").Close()
readOne(t, out)
readOne(t, out)
}
func TestReconnect(t *testing.T) {
// Find an open port on localhost by opening a listener on an
// unspecified port, querying its address, then closing it.
l, err := net.Listen("tcp", "localhost:0")
if err != nil {
t.Fatal(err)
}
laddr := l.Addr()
l.Close()
defer dialAndSend(t, laddr.Network(), laddr.String()).Close()
defer dialAndSend(t, laddr.Network(), laddr.String()).Close()
time.Sleep(1500 * time.Millisecond)
l, err = net.Listen(laddr.Network(), laddr.String())
if err != nil {
t.Fatal(err)
}
in := NewFrameStreamSockInput(l)
in.SetLogger(&testLogger{t})
out := make(chan []byte)
go in.ReadInto(out)
readOne(t, out)
readOne(t, out)
}
func BenchmarkConnectUnidirectional(b *testing.B) {
b.StopTimer()
l, err := net.Listen("tcp", "localhost:0")
if err != nil {
b.Fatal(err)
}
// read from tcp socket into outch
outch := make(chan []byte, 32)
go func() {
// wait for connection
s, err := l.Accept()
if err != nil {
b.Error(err)
close(outch)
return
}
// start rewriter
in, err := NewFrameStreamInput(s, false)
if err != nil {
b.Error(err)
close(outch)
return
}
// read ASAP into outch
in.ReadInto(outch)
close(outch)
}()
// read from outch exactly b.N frames
// this is separate from the above, because the process of rewriting tcp into outch
// must run in parallel with reading b.N frames from outch
readDone := make(chan struct{})
go func() {
// wait for the first frame before starting the timer
<-outch
i := 1
b.StartTimer()
for _ = range outch {
i++
}
if i != b.N {
b.Error("invalid frame count")
}
close(readDone)
}()
// connect to tcp socket and start the output loop
c, err := net.Dial(l.Addr().Network(), l.Addr().String())
if err != nil {
b.Fatal(err)
}
out, err := NewFrameStreamOutput(c)
if err != nil {
b.Fatal(err)
}
go out.RunOutputLoop()
// write to the output channel exactly b.N frames
for i := 0; i < b.N; i++ {
out.GetOutputChannel() <- []byte("frame")
}
out.Close()
// wait for the reader
<-readDone
}
func BenchmarkConnectBidirectional(b *testing.B) {
b.StopTimer()
l, err := net.Listen("tcp", "localhost:0")
if err != nil {
b.Fatal(err)
}
// start an infinite tcp socket reader
in := NewFrameStreamSockInput(l)
outch := make(chan []byte, 32)
go in.ReadInto(outch)
// read up to b.N frames in background
readDone := make(chan struct{})
go func() {
<-outch
b.StartTimer()
for i := 1; i < b.N; i++ {
<-outch
} // NB: read never fails
close(readDone)
}()
// connect to tcp socket and start the output loop
out, err := NewFrameStreamSockOutput(l.Addr())
if err != nil {
b.Fatal(err)
}
go out.RunOutputLoop()
// write to the output channel exactly b.N frames
for i := 0; i < b.N; i++ {
out.GetOutputChannel() <- []byte("frame")
}
out.Close()
// wait for the reader
<-readDone
}
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