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package conn
import (
"errors"
"net"
"sync/atomic"
"testing"
"time"
"github.com/go-kit/log"
)
func TestManager(t *testing.T) {
var (
tickc = make(chan time.Time)
after = func(time.Duration) <-chan time.Time { return tickc }
dialconn = &mockConn{}
dialerr = error(nil)
dialer = func(string, string) (net.Conn, error) { return dialconn, dialerr }
mgr = NewManager(dialer, "netw", "addr", after, log.NewNopLogger())
)
// First conn should be fine.
conn := mgr.Take()
if conn == nil {
t.Fatal("nil conn")
}
// Write and check it went through.
if _, err := conn.Write([]byte{1, 2, 3}); err != nil {
t.Fatal(err)
}
if want, have := uint64(3), atomic.LoadUint64(&dialconn.wr); want != have {
t.Errorf("want %d, have %d", want, have)
}
// Put an error to kill the conn.
mgr.Put(errors.New("should kill the connection"))
// First takes should fail.
for i := 0; i < 10; i++ {
if conn = mgr.Take(); conn != nil {
t.Fatalf("iteration %d: want nil conn, got real conn", i)
}
}
// Trigger the reconnect.
tickc <- time.Now()
// The dial should eventually succeed and yield a good conn.
if !within(100*time.Millisecond, func() bool {
conn = mgr.Take()
return conn != nil
}) {
t.Fatal("conn remained nil")
}
// Write and check it went through.
if _, err := conn.Write([]byte{4, 5}); err != nil {
t.Fatal(err)
}
if want, have := uint64(5), atomic.LoadUint64(&dialconn.wr); want != have {
t.Errorf("want %d, have %d", want, have)
}
// Dial starts failing.
dialconn, dialerr = nil, errors.New("oh noes")
mgr.Put(errors.New("trigger that reconnect y'all"))
if conn = mgr.Take(); conn != nil {
t.Fatalf("want nil conn, got real conn")
}
// As many reconnects as they want.
go func() {
done := time.After(100 * time.Millisecond)
for {
select {
case tickc <- time.Now():
case <-done:
return
}
}
}()
// The dial should never succeed.
if within(100*time.Millisecond, func() bool {
conn = mgr.Take()
return conn != nil
}) {
t.Fatal("eventually got a good conn, despite failing dialer")
}
}
func TestIssue292(t *testing.T) {
// The util/conn.Manager won't attempt to reconnect to the provided endpoint
// if the endpoint is initially unavailable (e.g. dial tcp :8080:
// getsockopt: connection refused). If the endpoint is up when
// conn.NewManager is called and then goes down/up, it reconnects just fine.
var (
tickc = make(chan time.Time)
after = func(time.Duration) <-chan time.Time { return tickc }
dialconn = net.Conn(nil)
dialerr = errors.New("fail")
dialer = func(string, string) (net.Conn, error) { return dialconn, dialerr }
mgr = NewManager(dialer, "netw", "addr", after, log.NewNopLogger())
)
if conn := mgr.Take(); conn != nil {
t.Fatal("first Take should have yielded nil conn, but didn't")
}
dialconn, dialerr = &mockConn{}, nil
select {
case tickc <- time.Now():
case <-time.After(time.Second):
t.Fatal("manager isn't listening for a tick, despite a failed dial")
}
if !within(time.Second, func() bool {
return mgr.Take() != nil
}) {
t.Fatal("second Take should have yielded good conn, but didn't")
}
}
type mockConn struct {
rd, wr uint64
}
func (c *mockConn) Read(b []byte) (n int, err error) {
atomic.AddUint64(&c.rd, uint64(len(b)))
return len(b), nil
}
func (c *mockConn) Write(b []byte) (n int, err error) {
atomic.AddUint64(&c.wr, uint64(len(b)))
return len(b), nil
}
func (c *mockConn) Close() error { return nil }
func (c *mockConn) LocalAddr() net.Addr { return nil }
func (c *mockConn) RemoteAddr() net.Addr { return nil }
func (c *mockConn) SetDeadline(t time.Time) error { return nil }
func (c *mockConn) SetReadDeadline(t time.Time) error { return nil }
func (c *mockConn) SetWriteDeadline(t time.Time) error { return nil }
func within(d time.Duration, f func() bool) bool {
deadline := time.Now().Add(d)
for {
if time.Now().After(deadline) {
return false
}
if f() {
return true
}
time.Sleep(d / 10)
}
}
|
