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// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package event
import (
"context"
"errors"
"testing"
"time"
)
var errInts = errors.New("error in subscribeInts")
func subscribeInts(max, fail int, c chan<- int) Subscription {
return NewSubscription(func(quit <-chan struct{}) error {
for i := 0; i < max; i++ {
if i >= fail {
return errInts
}
select {
case c <- i:
case <-quit:
return nil
}
}
return nil
})
}
func TestNewSubscriptionError(t *testing.T) {
t.Parallel()
channel := make(chan int)
sub := subscribeInts(10, 2, channel)
loop:
for want := 0; want < 10; want++ {
select {
case got := <-channel:
if got != want {
t.Fatalf("wrong int %d, want %d", got, want)
}
case err := <-sub.Err():
if err != errInts {
t.Fatalf("wrong error: got %q, want %q", err, errInts)
}
if want != 2 {
t.Fatalf("got errInts at int %d, should be received at 2", want)
}
break loop
}
}
sub.Unsubscribe()
err, ok := <-sub.Err()
if err != nil {
t.Fatal("got non-nil error after Unsubscribe")
}
if ok {
t.Fatal("channel still open after Unsubscribe")
}
}
func TestResubscribe(t *testing.T) {
t.Parallel()
var i int
nfails := 6
sub := Resubscribe(100*time.Millisecond, func(ctx context.Context) (Subscription, error) {
// fmt.Printf("call #%d @ %v\n", i, time.Now())
i++
if i == 2 {
// Delay the second failure a bit to reset the resubscribe interval.
time.Sleep(200 * time.Millisecond)
}
if i < nfails {
return nil, errors.New("oops")
}
sub := NewSubscription(func(unsubscribed <-chan struct{}) error { return nil })
return sub, nil
})
<-sub.Err()
if i != nfails {
t.Fatalf("resubscribe function called %d times, want %d times", i, nfails)
}
}
func TestResubscribeAbort(t *testing.T) {
t.Parallel()
done := make(chan error)
sub := Resubscribe(0, func(ctx context.Context) (Subscription, error) {
select {
case <-ctx.Done():
done <- nil
case <-time.After(2 * time.Second):
done <- errors.New("context given to resubscribe function not canceled within 2s")
}
return nil, nil
})
sub.Unsubscribe()
if err := <-done; err != nil {
t.Fatal(err)
}
}
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