forked from cerc-io/plugeth
c213fd1fd8
There is no need to depend on the old context package now that the minimum Go version is 1.7. The move to "context" eliminates our weird vendoring setup. Some vendored code still uses golang.org/x/net/context and it is now vendored in the normal way. This change triggered new vet checks around context.WithTimeout which didn't fire with golang.org/x/net/context.
121 lines
2.9 KiB
Go
121 lines
2.9 KiB
Go
// Copyright 2017 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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