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