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package xgb
import (
"bytes"
"errors"
"io"
"net"
"regexp"
"runtime"
"strconv"
"strings"
"testing"
"time"
)
type addr struct {
s string
}
func (_ addr) Network() string { return "dummy" }
func (a addr) String() string { return a.s }
type serverBlocking struct {
addr addr
control chan interface{}
done chan struct{}
}
func newServerBlocking(name string) *serverBlocking {
s := &serverBlocking{
addr{name},
make(chan interface{}),
make(chan struct{}),
}
runned := make(chan struct{})
go func() {
close(runned)
defer close(s.done)
for {
select {
case ci := <-s.control:
if ci == nil {
return
}
}
}
}()
<-runned
return s
}
func (_ *serverBlocking) errClosed() error {
return errors.New("server closed")
}
func (_ *serverBlocking) errEOF() error {
return io.EOF
}
func (s *serverBlocking) Write(b []byte) (int, error) {
select {
case <-s.done:
}
return 0, s.errClosed()
}
func (s *serverBlocking) Read(b []byte) (int, error) {
select {
case <-s.done:
}
return 0, s.errEOF()
}
func (s *serverBlocking) Close() error {
select {
case s.control <- nil:
<-s.done
return nil
case <-s.done:
return s.errClosed()
}
}
func (s *serverBlocking) LocalAddr() net.Addr { return s.addr }
func (s *serverBlocking) RemoteAddr() net.Addr { return s.addr }
func (s *serverBlocking) SetDeadline(t time.Time) error { return nil }
func (s *serverBlocking) SetReadDeadline(t time.Time) error { return nil }
func (s *serverBlocking) SetWriteDeadline(t time.Time) error { return nil }
type serverWriteError struct {
*serverBlocking
}
func newServerWriteError(name string) *serverWriteError {
return &serverWriteError{newServerBlocking(name)}
}
func (s *serverWriteError) Write(b []byte) (int, error) {
select {
case <-s.done:
return 0, s.errClosed()
default:
}
return 0, s.errWrite()
}
func (_ *serverWriteError) errWrite() error {
return errors.New("write failed")
}
type goroutine struct {
id int
name string
stack []byte
}
type leaks struct {
goroutines map[int]goroutine
}
func leaksMonitor() leaks {
return leaks{
leaks{}.collectGoroutines(),
}
}
// ispired by https://golang.org/src/runtime/debug/stack.go?s=587:606#L21
// stack returns a formatted stack trace of all goroutines.
// It calls runtime.Stack with a large enough buffer to capture the entire trace.
func (_ leaks) stack() []byte {
buf := make([]byte, 1024)
for {
n := runtime.Stack(buf, true)
if n < len(buf) {
return buf[:n]
}
buf = make([]byte, 2*len(buf))
}
}
func (l leaks) collectGoroutines() map[int]goroutine {
res := make(map[int]goroutine)
stacks := bytes.Split(l.stack(), []byte{'\n', '\n'})
regexpId := regexp.MustCompile(`^\s*goroutine\s*(\d+)`)
for _, st := range stacks {
lines := bytes.Split(st, []byte{'\n'})
if len(lines) < 2 {
panic("routine stach has less tnan two lines: " + string(st))
}
idMatches := regexpId.FindSubmatch(lines[0])
if len(idMatches) < 2 {
panic("no id found in goroutine stack's first line: " + string(lines[0]))
}
id, err := strconv.Atoi(string(idMatches[1]))
if err != nil {
panic("converting goroutine id to number error: " + err.Error())
}
if _, ok := res[id]; ok {
panic("2 goroutines with same id: " + strconv.Itoa(id))
}
name := strings.TrimSpace(string(lines[1]))
//filter out our stack routine
if strings.Contains(name, "xgb.leaks.stack") {
continue
}
res[id] = goroutine{id, name, st}
}
return res
}
func (l leaks) checkTesting(t *testing.T) {
{
goroutines := l.collectGoroutines()
if len(l.goroutines) >= len(goroutines) {
return
}
}
leakTimeout := time.Second
time.Sleep(leakTimeout)
//t.Logf("possible goroutine leakage, waiting %v", leakTimeout)
goroutines := l.collectGoroutines()
if len(l.goroutines) >= len(goroutines) {
return
}
t.Errorf("%d goroutine leaks: start(%d) != end(%d)", len(goroutines)-len(l.goroutines), len(l.goroutines), len(goroutines))
for id, gr := range goroutines {
if _, ok := l.goroutines[id]; ok {
continue
}
t.Log(gr.name, "\n", string(gr.stack))
}
}
func TestConnOpenClose(t *testing.T) {
testCases := []struct {
name string
serverConstuctor func(string) net.Conn
}{
//{"blocking server", func(n string) net.Conn { return newServerBlocking(n) }}, // i'm not ready to handle this yet
{"write error server", func(n string) net.Conn { return newServerWriteError(n) }},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
serverConn := tc.serverConstuctor(tc.name)
defer serverConn.Close()
defer leaksMonitor().checkTesting(t)
c, err := postNewConn(&Conn{conn: serverConn})
if err != nil {
t.Fatalf("connect error: %v", err)
}
//t.Logf("connection to server created: %v", c)
closeErr := make(chan struct{})
go func() {
//t.Logf("closing connection to server")
c.Close()
close(closeErr)
}()
closeTimeout := time.Second
select {
case <-closeErr:
//t.Logf("connection to server closed")
case <-time.After(closeTimeout):
t.Errorf("*Conn.Close() not responded for %v", closeTimeout)
}
})
}
}
|
