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|
package xgb
import (
"bytes"
"errors"
"io"
"net"
"regexp"
"runtime"
"strconv"
"strings"
"testing"
"time"
)
type addr struct{}
func (_ addr) Network() string { return "" }
func (_ addr) String() string { return "" }
type server struct {
control chan interface{}
done chan struct{}
}
func newServer() net.Conn {
s := &server{
make(chan interface{}),
make(chan struct{}),
}
go func() {
defer close(s.done)
for {
select {
case ci := <-s.control:
if ci == nil {
return
}
}
}
}()
return s
}
func (_ *server) errClosed() error {
return errors.New("closed")
}
func (_ *server) errEOF() error {
return io.EOF
}
func (s *server) Write(b []byte) (int, error) {
select {
case <-s.done:
}
return 0, s.errClosed()
}
func (s *server) Read(b []byte) (int, error) {
select {
case <-s.done:
}
return 0, s.errEOF()
}
func (s *server) Close() error {
select {
case s.control <- nil:
<-s.done
return nil
case <-s.done:
return s.errClosed()
}
}
func (s *server) LocalAddr() net.Addr { return addr{} }
func (s *server) RemoteAddr() net.Addr { return addr{} }
func (s *server) SetDeadline(t time.Time) error { return nil }
func (s *server) SetReadDeadline(t time.Time) error { return nil }
func (s *server) SetWriteDeadline(t time.Time) error { return nil }
// 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 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))
}
}
type goroutine struct {
id int
name string
stack []byte
}
type leaks struct {
goroutines map[int]goroutine
}
func leaksMonitor() leaks {
return leaks{
leaks{}.collectGoroutines(),
}
}
func (_ leaks) collectGoroutines() map[int]goroutine {
res := make(map[int]goroutine)
stacks := bytes.Split(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))
}
//TODO filter out test routines, stack routine
res[id] = goroutine{id, strings.TrimSpace(string(lines[1])), st}
}
return res
}
func (l leaks) checkTesting(t *testing.T) {
{
goroutines := l.collectGoroutines()
if len(l.goroutines) == len(goroutines) {
return
}
}
leakTimeout := time.Second
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) {
//t.Logf("creating new dummy blocking server")
s := newServer()
defer func() {
if err := s.Close(); err != nil {
t.Errorf("server closing error: %v", err)
}
}()
//t.Logf("new server created: %v", s)
defer leaksMonitor().checkTesting(t)
c, err := postNewConn(&Conn{conn: s})
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)
}
}
|
