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// Copyright 2015 Prometheus Team
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package test
import (
"fmt"
"testing"
"time"
"github.com/prometheus/common/model"
)
// Collector gathers alerts received by a notification receiver
// and verifies whether all arrived and within the correct time boundaries.
type Collector struct {
t *testing.T
name string
opts *AcceptanceOpts
collected map[float64][]model.Alerts
expected map[Interval][]model.Alerts
}
func (c *Collector) String() string {
return c.name
}
func batchesEqual(as, bs model.Alerts, opts *AcceptanceOpts) bool {
if len(as) != len(bs) {
return false
}
for _, a := range as {
found := false
for _, b := range bs {
if equalAlerts(a, b, opts) {
found = true
break
}
}
if !found {
return false
}
}
return true
}
// latest returns the latest relative point in time where a notification is
// expected.
func (c *Collector) latest() float64 {
var latest float64
for iv := range c.expected {
if iv.end > latest {
latest = iv.end
}
}
return latest
}
// Want declares that the Collector expects to receive the given alerts
// within the given time boundaries.
func (c *Collector) Want(iv Interval, alerts ...*TestAlert) {
var nas model.Alerts
for _, a := range alerts {
nas = append(nas, a.nativeAlert(c.opts))
}
c.expected[iv] = append(c.expected[iv], nas)
}
// add the given alerts to the collected alerts.
func (c *Collector) add(alerts ...*model.Alert) {
arrival := c.opts.relativeTime(time.Now())
c.collected[arrival] = append(c.collected[arrival], model.Alerts(alerts))
}
func (c *Collector) check() string {
report := fmt.Sprintf("\ncollector %q:\n\n", c)
for iv, expected := range c.expected {
report += fmt.Sprintf("interval %v\n", iv)
for _, exp := range expected {
var found model.Alerts
report += fmt.Sprintf("---\n")
for _, e := range exp {
report += fmt.Sprintf("- %v\n", c.opts.alertString(e))
}
for at, got := range c.collected {
if !iv.contains(at) {
continue
}
for _, a := range got {
if batchesEqual(exp, a, c.opts) {
found = a
break
}
}
if found != nil {
break
}
}
if found != nil {
report += fmt.Sprintf(" [ ✓ ]\n")
} else {
c.t.Fail()
report += fmt.Sprintf(" [ ✗ ]\n")
}
}
}
// Detect unexpected notifications.
var totalExp, totalAct int
for _, exp := range c.expected {
for _, e := range exp {
totalExp += len(e)
}
}
for _, act := range c.collected {
for _, a := range act {
if len(a) == 0 {
c.t.Error("received empty notifications")
}
totalAct += len(a)
}
}
if totalExp != totalAct {
c.t.Fail()
report += fmt.Sprintf("\nExpected total of %d alerts, got %d", totalExp, totalAct)
}
if c.t.Failed() {
report += "\nreceived:\n"
for at, col := range c.collected {
for _, alerts := range col {
report += fmt.Sprintf("@ %v\n", at)
for _, a := range alerts {
report += fmt.Sprintf("- %v\n", c.opts.alertString(a))
}
}
}
}
return report
}
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