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health_test.go
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// Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package health
import (
"context"
"errors"
"fmt"
"sync"
"testing"
"time"
"github.com/prometheus/client_golang/prometheus"
"github.com/stretchr/testify/require"
"github.com/ava-labs/avalanchego/utils"
"github.com/ava-labs/avalanchego/utils/logging"
)
const (
checkFreq = time.Millisecond
awaitFreq = 50 * time.Microsecond
awaitTimeout = 30 * time.Second
)
var errUnhealthy = errors.New("unhealthy")
func awaitReadiness(t *testing.T, r Reporter, ready bool) {
require.Eventually(t, func() bool {
_, ok := r.Readiness()
return ok == ready
}, awaitTimeout, awaitFreq)
}
func awaitHealthy(t *testing.T, r Reporter, healthy bool) {
require.Eventually(t, func() bool {
_, ok := r.Health()
return ok == healthy
}, awaitTimeout, awaitFreq)
}
func awaitLiveness(t *testing.T, r Reporter, liveness bool) {
require.Eventually(t, func() bool {
_, ok := r.Liveness()
return ok == liveness
}, awaitTimeout, awaitFreq)
}
func TestDuplicatedRegistations(t *testing.T) {
require := require.New(t)
check := CheckerFunc(func(context.Context) (interface{}, error) {
return "", nil
})
h, err := New(logging.NoLog{}, prometheus.NewRegistry())
require.NoError(err)
require.NoError(h.RegisterReadinessCheck("check", check))
err = h.RegisterReadinessCheck("check", check)
require.ErrorIs(err, errDuplicateCheck)
require.NoError(h.RegisterHealthCheck("check", check))
err = h.RegisterHealthCheck("check", check)
require.ErrorIs(err, errDuplicateCheck)
require.NoError(h.RegisterLivenessCheck("check", check))
err = h.RegisterLivenessCheck("check", check)
require.ErrorIs(err, errDuplicateCheck)
}
func TestDefaultFailing(t *testing.T) {
require := require.New(t)
check := CheckerFunc(func(context.Context) (interface{}, error) {
return "", nil
})
h, err := New(logging.NoLog{}, prometheus.NewRegistry())
require.NoError(err)
{
require.NoError(h.RegisterReadinessCheck("check", check))
readinessResult, readiness := h.Readiness()
require.Len(readinessResult, 1)
require.Contains(readinessResult, "check")
require.Equal(notYetRunResult, readinessResult["check"])
require.False(readiness)
}
{
require.NoError(h.RegisterHealthCheck("check", check))
healthResult, health := h.Health()
require.Len(healthResult, 1)
require.Contains(healthResult, "check")
require.Equal(notYetRunResult, healthResult["check"])
require.False(health)
}
{
require.NoError(h.RegisterLivenessCheck("check", check))
livenessResult, liveness := h.Liveness()
require.Len(livenessResult, 1)
require.Contains(livenessResult, "check")
require.Equal(notYetRunResult, livenessResult["check"])
require.False(liveness)
}
}
func TestPassingChecks(t *testing.T) {
require := require.New(t)
check := CheckerFunc(func(context.Context) (interface{}, error) {
return "", nil
})
h, err := New(logging.NoLog{}, prometheus.NewRegistry())
require.NoError(err)
require.NoError(h.RegisterReadinessCheck("check", check))
require.NoError(h.RegisterHealthCheck("check", check))
require.NoError(h.RegisterLivenessCheck("check", check))
h.Start(context.Background(), checkFreq)
defer h.Stop()
{
awaitReadiness(t, h, true)
readinessResult, readiness := h.Readiness()
require.Len(readinessResult, 1)
require.Contains(readinessResult, "check")
result := readinessResult["check"]
require.Equal("", result.Details)
require.Nil(result.Error)
require.Zero(result.ContiguousFailures)
require.True(readiness)
}
{
awaitHealthy(t, h, true)
healthResult, health := h.Health()
require.Len(healthResult, 1)
require.Contains(healthResult, "check")
result := healthResult["check"]
require.Equal("", result.Details)
require.Nil(result.Error)
require.Zero(result.ContiguousFailures)
require.True(health)
}
{
awaitLiveness(t, h, true)
livenessResult, liveness := h.Liveness()
require.Len(livenessResult, 1)
require.Contains(livenessResult, "check")
result := livenessResult["check"]
require.Equal("", result.Details)
require.Nil(result.Error)
require.Zero(result.ContiguousFailures)
require.True(liveness)
}
}
func TestPassingThenFailingChecks(t *testing.T) {
require := require.New(t)
var shouldCheckErr utils.Atomic[bool]
check := CheckerFunc(func(context.Context) (interface{}, error) {
if shouldCheckErr.Get() {
return errUnhealthy.Error(), errUnhealthy
}
return "", nil
})
h, err := New(logging.NoLog{}, prometheus.NewRegistry())
require.NoError(err)
require.NoError(h.RegisterReadinessCheck("check", check))
require.NoError(h.RegisterHealthCheck("check", check))
require.NoError(h.RegisterLivenessCheck("check", check))
h.Start(context.Background(), checkFreq)
defer h.Stop()
awaitReadiness(t, h, true)
awaitHealthy(t, h, true)
awaitLiveness(t, h, true)
{
_, readiness := h.Readiness()
require.True(readiness)
_, health := h.Health()
require.True(health)
_, liveness := h.Liveness()
require.True(liveness)
}
shouldCheckErr.Set(true)
awaitHealthy(t, h, false)
awaitLiveness(t, h, false)
{
// Notice that Readiness is a monotonic check - so it still reports
// ready.
_, readiness := h.Readiness()
require.True(readiness)
_, health := h.Health()
require.False(health)
_, liveness := h.Liveness()
require.False(liveness)
}
}
func TestDeadlockRegression(t *testing.T) {
require := require.New(t)
h, err := New(logging.NoLog{}, prometheus.NewRegistry())
require.NoError(err)
var lock sync.Mutex
check := CheckerFunc(func(context.Context) (interface{}, error) {
lock.Lock()
time.Sleep(time.Nanosecond)
lock.Unlock()
return "", nil
})
h.Start(context.Background(), time.Nanosecond)
defer h.Stop()
for i := 0; i < 100; i++ {
lock.Lock()
require.NoError(h.RegisterHealthCheck(fmt.Sprintf("check-%d", i), check))
lock.Unlock()
}
awaitHealthy(t, h, true)
}
func TestTags(t *testing.T) {
require := require.New(t)
check := CheckerFunc(func(context.Context) (interface{}, error) {
return "", nil
})
h, err := New(logging.NoLog{}, prometheus.NewRegistry())
require.NoError(err)
require.NoError(h.RegisterHealthCheck("check1", check))
require.NoError(h.RegisterHealthCheck("check2", check, "tag1"))
require.NoError(h.RegisterHealthCheck("check3", check, "tag2"))
require.NoError(h.RegisterHealthCheck("check4", check, "tag1", "tag2"))
require.NoError(h.RegisterHealthCheck("check5", check, ApplicationTag))
// default checks
{
healthResult, health := h.Health()
require.Len(healthResult, 5)
require.Contains(healthResult, "check1")
require.Contains(healthResult, "check2")
require.Contains(healthResult, "check3")
require.Contains(healthResult, "check4")
require.Contains(healthResult, "check5")
require.False(health)
healthResult, health = h.Health("tag1")
require.Len(healthResult, 3)
require.Contains(healthResult, "check2")
require.Contains(healthResult, "check4")
require.Contains(healthResult, "check5")
require.False(health)
healthResult, health = h.Health("tag1", "tag2")
require.Len(healthResult, 4)
require.Contains(healthResult, "check2")
require.Contains(healthResult, "check3")
require.Contains(healthResult, "check4")
require.Contains(healthResult, "check5")
require.False(health)
healthResult, health = h.Health("nonExistentTag")
require.Len(healthResult, 1)
require.Contains(healthResult, "check5")
require.False(health)
healthResult, health = h.Health("tag1", "tag2", "nonExistentTag")
require.Len(healthResult, 4)
require.Contains(healthResult, "check2")
require.Contains(healthResult, "check3")
require.Contains(healthResult, "check4")
require.Contains(healthResult, "check5")
require.False(health)
}
h.Start(context.Background(), checkFreq)
awaitHealthy(t, h, true)
{
healthResult, health := h.Health()
require.Len(healthResult, 5)
require.Contains(healthResult, "check1")
require.Contains(healthResult, "check2")
require.Contains(healthResult, "check3")
require.Contains(healthResult, "check4")
require.Contains(healthResult, "check5")
require.True(health)
healthResult, health = h.Health("tag1")
require.Len(healthResult, 3)
require.Contains(healthResult, "check2")
require.Contains(healthResult, "check4")
require.Contains(healthResult, "check5")
require.True(health)
healthResult, health = h.Health("tag1", "tag2")
require.Len(healthResult, 4)
require.Contains(healthResult, "check2")
require.Contains(healthResult, "check3")
require.Contains(healthResult, "check4")
require.Contains(healthResult, "check5")
require.True(health)
healthResult, health = h.Health("nonExistentTag")
require.Len(healthResult, 1)
require.Contains(healthResult, "check5")
require.True(health)
healthResult, health = h.Health("tag1", "tag2", "nonExistentTag")
require.Len(healthResult, 4)
require.Contains(healthResult, "check2")
require.Contains(healthResult, "check3")
require.Contains(healthResult, "check4")
require.Contains(healthResult, "check5")
require.True(health)
}
// stop the health check
h.Stop()
{
// now we'll add a new check which is unhealthy by default (notYetRunResult)
require.NoError(h.RegisterHealthCheck("check6", check, "tag1"))
awaitHealthy(t, h, false)
healthResult, health := h.Health("tag1")
require.Len(healthResult, 4)
require.Contains(healthResult, "check2")
require.Contains(healthResult, "check4")
require.Contains(healthResult, "check5")
require.Contains(healthResult, "check6")
require.Equal(notYetRunResult, healthResult["check6"])
require.False(health)
healthResult, health = h.Health("tag2")
require.Len(healthResult, 3)
require.Contains(healthResult, "check3")
require.Contains(healthResult, "check4")
require.Contains(healthResult, "check5")
require.True(health)
// add application tag
require.NoError(h.RegisterHealthCheck("check7", check, ApplicationTag))
awaitHealthy(t, h, false)
healthResult, health = h.Health("tag2")
require.Len(healthResult, 4)
require.Contains(healthResult, "check3")
require.Contains(healthResult, "check4")
require.Contains(healthResult, "check5")
require.Contains(healthResult, "check7")
require.Equal(notYetRunResult, healthResult["check7"])
require.False(health)
}
}