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108 lines
4.3 KiB
108 lines
4.3 KiB
// Copyright 2013 Prometheus Team
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package retrieval
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import (
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"github.com/prometheus/prometheus/utility"
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"github.com/prometheus/prometheus/utility/test"
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"testing"
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"time"
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)
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type fakeHealthReporter struct {
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index int
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stateQueue []TargetState
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}
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func (h fakeHealthReporter) State() (state TargetState) {
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state = h.stateQueue[h.index]
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h.index++
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return
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}
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func testHealthScheduler(t test.Tester) {
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now := time.Now()
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var scenarios = []struct {
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futureHealthState []TargetState
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preloadedTimes []time.Time
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expectedSchedule []time.Time
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}{
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// The behavior discussed in healthScheduler.Reschedule should be read
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// fully to understand the whys and wherefores.
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{
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futureHealthState: []TargetState{UNKNOWN, ALIVE, ALIVE},
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preloadedTimes: []time.Time{now, now.Add(time.Minute), now.Add(time.Minute * 2)},
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expectedSchedule: []time.Time{now, now.Add(time.Minute), now.Add(time.Minute * 2)},
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},
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{
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futureHealthState: []TargetState{UNKNOWN, UNREACHABLE, UNREACHABLE},
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preloadedTimes: []time.Time{now, now.Add(time.Minute), now.Add(time.Minute * 2)},
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expectedSchedule: []time.Time{now, now.Add(time.Second * 2), now.Add(time.Minute).Add(time.Second * 4)},
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},
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{
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futureHealthState: []TargetState{UNKNOWN, UNREACHABLE, ALIVE},
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preloadedTimes: []time.Time{now, now.Add(time.Minute), now.Add(time.Minute * 2)},
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expectedSchedule: []time.Time{now, now.Add(time.Second * 2), now.Add(time.Minute * 2)},
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},
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{
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futureHealthState: []TargetState{UNKNOWN, UNREACHABLE, UNREACHABLE, UNREACHABLE, UNREACHABLE, UNREACHABLE, UNREACHABLE, UNREACHABLE, UNREACHABLE, UNREACHABLE, UNREACHABLE, UNREACHABLE, UNREACHABLE},
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preloadedTimes: []time.Time{now, now.Add(time.Minute), now.Add(time.Minute * 2), now.Add(time.Minute * 3), now.Add(time.Minute * 4), now.Add(time.Minute * 5), now.Add(time.Minute * 6), now.Add(time.Minute * 7), now.Add(time.Minute * 8), now.Add(time.Minute * 9), now.Add(time.Minute * 10), now.Add(time.Minute * 11), now.Add(time.Minute * 12)},
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expectedSchedule: []time.Time{now, now.Add(time.Second * 2), now.Add(time.Minute * 1).Add(time.Second * 4), now.Add(time.Minute * 2).Add(time.Second * 8), now.Add(time.Minute * 3).Add(time.Second * 16), now.Add(time.Minute * 4).Add(time.Second * 32), now.Add(time.Minute * 5).Add(time.Second * 64), now.Add(time.Minute * 6).Add(time.Second * 128), now.Add(time.Minute * 7).Add(time.Second * 256), now.Add(time.Minute * 8).Add(time.Second * 512), now.Add(time.Minute * 9).Add(time.Second * 1024), now.Add(time.Minute * 10).Add(time.Minute * 30), now.Add(time.Minute * 11).Add(time.Minute * 30)},
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},
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}
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for i, scenario := range scenarios {
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provider := test.NewInstantProvider(scenario.preloadedTimes)
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reporter := fakeHealthReporter{}
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for _, state := range scenario.futureHealthState {
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reporter.stateQueue = append(reporter.stateQueue, state)
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}
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if len(scenario.preloadedTimes) != len(scenario.futureHealthState) || len(scenario.futureHealthState) != len(scenario.expectedSchedule) {
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t.Fatalf("%d. times and health reports and next time lengths were not equal.", i)
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}
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time := utility.Time{
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Provider: provider,
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}
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scheduler := healthScheduler{
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time: time,
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target: reporter,
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scheduledFor: now,
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}
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for j := 0; j < len(scenario.preloadedTimes); j++ {
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futureState := scenario.futureHealthState[j]
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scheduler.Reschedule(scenario.preloadedTimes[j], futureState)
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nextSchedule := scheduler.ScheduledFor()
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if nextSchedule != scenario.expectedSchedule[j] {
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t.Errorf("%d.%d. Expected to be scheduled to %s, got %s", i, j, scenario.expectedSchedule[j], nextSchedule)
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}
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}
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}
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}
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func TestHealthScheduler(t *testing.T) {
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testHealthScheduler(t)
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}
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func BenchmarkHealthScheduler(b *testing.B) {
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for i := 0; i < b.N; i++ {
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testHealthScheduler(b)
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}
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}
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