mirror of
https://github.com/hatchet-dev/hatchet.git
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108 lines
3.6 KiB
Go
108 lines
3.6 KiB
Go
//go:build !e2e && !load && !rampup && !integration
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// Copyright (c) 2020 Filip Wojciechowski
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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package randomticker_test
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import (
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"testing"
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"time"
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"github.com/hatchet-dev/hatchet/pkg/randomticker"
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)
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func TestRandomTicker(t *testing.T) {
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t.Parallel()
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minDuration := time.Duration(10)
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maxDuration := time.Duration(20)
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// tick can take a little longer since we're not adjusting it to account for
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// processing.
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precision := time.Duration(4)
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rt := randomticker.NewRandomTicker(minDuration*time.Millisecond, maxDuration*time.Millisecond)
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for i := 0; i < 5; i++ {
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t0 := time.Now()
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t1 := <-rt.C
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td := t1.Sub(t0)
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if td < minDuration*time.Millisecond {
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t.Fatalf("tick was shorter than expected: %s", td)
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} else if td > (maxDuration+precision)*time.Millisecond {
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t.Fatalf("tick was longer than expected: %s", td)
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}
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}
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rt.Stop()
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time.Sleep((maxDuration + precision) * time.Millisecond)
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select {
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case v, ok := <-rt.C:
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if ok || !v.IsZero() {
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t.Fatal("ticker did not shut down")
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}
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default:
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t.Fatal("expected to receive close channel signal")
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}
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}
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// TestRandomTickerUnblockingIssue is a regression test for a bug in the original implementation
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// where the ticker would stop generating new events if no one was reading from the channel.
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func TestRandomTickerUnblockingIssue(t *testing.T) {
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minDuration := 50 * time.Millisecond
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maxDuration := 100 * time.Millisecond
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// Create the random ticker
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rt := randomticker.NewRandomTicker(minDuration, maxDuration)
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defer rt.Stop()
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// Get the first tick to make sure it's working
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select {
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case <-rt.C:
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// Good, we got a tick
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case <-time.After(maxDuration * 2):
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t.Fatal("didn't receive initial tick in the expected timeframe")
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}
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// Now simulate a scenario where the consumer isn't reading from the channel
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// by just waiting without reading from rt.C
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time.Sleep(maxDuration * 2)
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// After ignoring the channel for a while, now try to read from it again
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// With the bug, this would hang because no new ticks are generated
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// With the fix, we should get a new tick within 2*maxDuration
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tickCount := 0
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timeout := time.After(maxDuration * 5) // Give it plenty of time to tick
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for tickCount < 3 { // Try to get 3 more ticks
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select {
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case <-rt.C:
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tickCount++
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case <-timeout:
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// With the original implementation, we'll hit this timeout
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t.Fatalf("only received %d ticks after ignoring the channel; ticker appears stuck", tickCount)
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return
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}
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}
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// If we get here, the ticker continued to generate events even when
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// we weren't reading from the channel, which means the fix is working
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}
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