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mackerel.go
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mackerel.go
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package mackerel
import (
"container/ring"
"context"
"fmt"
"sync"
"time"
"github.com/mackerelio/golib/logging"
"github.com/mackerelio/mackerel-agent/checks"
"github.com/mackerelio/mackerel-agent/config"
"github.com/mackerelio/mackerel-agent/metrics"
)
var (
reportCheckDelaySeconds = 1 // Wait for a second before reporting the next check
reportCheckDelaySecondsMax = 30 // Wait 30 seconds before reporting the next check when many reports in queue
reportCheckBufferSize = 6 * 60 // Keep check reports of 6 hours in the queue
reportPluginInterval = 60 // Wait 30 seconds before reporting the next check when many reports in queue
)
var logger = logging.GetLogger("command")
var CheckResult sync.Map
var CheckResultMessage sync.Map
var PluginResult sync.Map
var checkHistry sync.Map
func init() {
CheckResult = sync.Map{}
PluginResult = sync.Map{}
CheckResultMessage = sync.Map{}
}
// LICENCE: https://github.com/mackerelio/mackerel-agent/blob/master/LICENSE
// import from github.com/mackerelio/mackerel-agent/command/command.go
func CreateCheckers(conf *config.Config) []*checks.Checker {
checkers := []*checks.Checker{}
if conf.CheckPlugins != nil {
for name, pluginConfig := range conf.CheckPlugins {
checker := &checks.Checker{
Name: name,
Config: pluginConfig,
}
checkers = append(checkers, checker)
}
}
return checkers
}
func PluginGenerators(conf *config.Config) []metrics.PluginGenerator {
generators := []metrics.PluginGenerator{}
for _, pluginConfig := range conf.MetricPlugins {
generators = append(generators, metrics.NewPluginGenerator(pluginConfig))
}
if conf.Diagnostic {
generators = append(generators, &metrics.AgentGenerator{})
}
return generators
}
func Loop(checkers []*checks.Checker, plugins []metrics.PluginGenerator, ctx context.Context) error {
if len(checkers) > 0 {
runCheckersLoop(ctx, checkers, plugins)
}
return nil
}
func runCheckersLoop(ctx context.Context, checkers []*checks.Checker, plugins []metrics.PluginGenerator) {
// Do not block checking.
checkReportCh := make(chan *checks.Report, reportCheckBufferSize*len(checkers))
for _, checker := range checkers {
go runChecker(ctx, checker, checkReportCh)
}
ticker := time.NewTicker(time.Second * time.Duration(reportPluginInterval))
defer ticker.Stop()
for {
select {
case <-ctx.Done():
return
case <-ticker.C:
values := generateValues(plugins)
for _, vs := range values {
if vs != nil {
for k, v := range vs.Values {
PluginResult.Store(k, v)
}
}
}
case report := <-checkReportCh:
CheckResult.Store(report.Name, report.Status)
CheckResultMessage.Store(report.Name, report.Message)
}
}
}
func runChecker(ctx context.Context, checker *checks.Checker, checkReportCh chan *checks.Report) {
lastStatus := checks.StatusUndefined
lastMessage := ""
interval := checker.Interval()
nextInterval := time.Duration(0)
nextTime := time.Now()
for {
select {
case <-time.After(nextInterval):
report := checker.Check()
logger.Debugf("checker %q: report=%v", checker.Name, report)
now := time.Now()
nextInterval = interval - (now.Sub(nextTime) % interval)
nextTime = now.Add(nextInterval)
if checker.Config.Action != nil {
env := []string{fmt.Sprintf("MACKEREL_STATUS=%s", report.Status), fmt.Sprintf("MACKEREL_PREVIOUS_STATUS=%s", lastStatus), fmt.Sprintf("MACKEREL_CHECK_MESSAGE=%s", report.Message)}
go func() {
stdout, stderr, exitCode, _ := checker.Config.Action.RunWithEnv(env)
if stderr != "" {
logger.Warningf("Checker %q action stdout: %q stderr: %q exitCode: %d", checker.Name, stdout, stderr, exitCode)
} else {
logger.Debugf("Checker %q action stdout: %q exitCode: %d", checker.Name, stdout, exitCode)
}
}()
}
if report.Status != checks.StatusOK && report.Status != lastStatus {
logger.Infof("checker %s result:%s message=%s", checker.Name, report.Status, report.Message)
}
if report.Status == checks.StatusOK && report.Status == lastStatus && report.Message == lastMessage {
// Do not report if nothing has changed
continue
}
if report.Status == checks.StatusOK && checker.Config.PreventAlertAutoClose {
// Do not report `OK` if `PreventAlertAutoClose`
lastStatus = report.Status
lastMessage = report.Message
continue
}
if checker.Config.MaxCheckAttempts != nil && *checker.Config.MaxCheckAttempts > 0 {
h, _ := checkHistry.LoadOrStore(checker.Name, ring.New(int(*checker.Config.MaxCheckAttempts)))
history := h.(*ring.Ring)
history.Value = report.Status
history = history.Next()
notOkCount := int32(0)
history.Do(func(x interface{}) {
if x != checks.StatusOK {
notOkCount++
}
})
if notOkCount <= *checker.Config.MaxCheckAttempts {
logger.Debugf("checker %s notOkCount=%d", checker.Name, notOkCount)
report.Status = checks.StatusOK
}
}
logger.Debugf("checker %s report.Status=%s", checker.Name, report.Status)
checkReportCh <- report
lastStatus = report.Status
lastMessage = report.Message
case <-ctx.Done():
return
}
}
}
func generateValues(generators []metrics.PluginGenerator) []*metrics.ValuesCustomIdentifier {
processed := make(chan *metrics.ValuesCustomIdentifier)
finish := make(chan struct{})
result := make(chan []*metrics.ValuesCustomIdentifier)
go func() {
allValues := []*metrics.ValuesCustomIdentifier{}
for {
select {
case values := <-processed:
allValues = metrics.MergeValuesCustomIdentifiers(allValues, values)
case <-finish:
result <- allValues
return
}
}
}()
go func() {
var wg sync.WaitGroup
for _, g := range generators {
wg.Add(1)
go func(g metrics.Generator) {
defer func() {
if r := recover(); r != nil {
logger.Errorf("Panic: generating value in %T (skip this metric): %s", g, r)
}
wg.Done()
}()
startedAt := time.Now()
values, err := g.Generate()
if seconds := (time.Now().Sub(startedAt) / time.Second); seconds > 120 {
logger.Warningf("%T.Generate() take a long time (%d seconds)", g, seconds)
}
if err != nil {
logger.Errorf("Failed to generate value in %T (skip this metric): %s", g, err.Error())
return
}
var customIdentifier *string
if pluginGenerator, ok := g.(metrics.PluginGenerator); ok {
customIdentifier = pluginGenerator.CustomIdentifier()
}
processed <- &metrics.ValuesCustomIdentifier{
Values: values,
CustomIdentifier: customIdentifier,
}
}(g)
}
wg.Wait()
finish <- struct{}{} // processed all jobs
}()
return <-result
}