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efe61c18fa
``Target`` will be refactored down the road to support various nuanced endpoint types. Thusly incorporating the scheduling behavior within it will be problematic. To that end, the scheduling behavior has been moved into a separate assistance type to improve conciseness and testability. ``make format`` was also run.
112 lines
4.3 KiB
Go
112 lines
4.3 KiB
Go
// 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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"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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type fakeTimeProvider struct {
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index int
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timeQueue []time.Time
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}
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func (t *fakeTimeProvider) Now() (time time.Time) {
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time = t.timeQueue[t.index]
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t.index++
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return
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}
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func TestHealthScheduler(t *testing.T) {
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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 := &fakeTimeProvider{}
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for _, time := range scenario.preloadedTimes {
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provider.timeQueue = append(provider.timeQueue, time)
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}
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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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timer := timer{
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provider: provider,
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}
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scheduler := healthScheduler{
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timer: timer,
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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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