func (t *Target) report(app storage.SampleAppender, start time.Time, duration time.Duration, err error) {
t.status.setLastScrape(start)
t.status.setLastError(err)
ts := model.TimeFromUnixNano(start.UnixNano())
var health model.SampleValue
if err == nil {
health = 1
}
healthSample := &model.Sample{
Metric: model.Metric{
model.MetricNameLabel: scrapeHealthMetricName,
},
Timestamp: ts,
Value: health,
}
durationSample := &model.Sample{
Metric: model.Metric{
model.MetricNameLabel: scrapeDurationMetricName,
},
Timestamp: ts,
Value: model.SampleValue(float64(duration) / float64(time.Second)),
}
app = t.wrapReportingAppender(app)
app.Append(healthSample)
app.Append(durationSample)
}
func recordScrapeHealth(
sampleAppender storage.SampleAppender,
timestamp time.Time,
baseLabels model.LabelSet,
health TargetHealth,
scrapeDuration time.Duration,
) {
healthMetric := make(model.Metric, len(baseLabels)+1)
durationMetric := make(model.Metric, len(baseLabels)+1)
healthMetric[model.MetricNameLabel] = scrapeHealthMetricName
durationMetric[model.MetricNameLabel] = scrapeDurationMetricName
for ln, lv := range baseLabels {
healthMetric[ln] = lv
durationMetric[ln] = lv
}
ts := model.TimeFromUnixNano(timestamp.UnixNano())
healthSample := &model.Sample{
Metric: healthMetric,
Timestamp: ts,
Value: health.value(),
}
durationSample := &model.Sample{
Metric: durationMetric,
Timestamp: ts,
Value: model.SampleValue(float64(scrapeDuration) / float64(time.Second)),
}
sampleAppender.Append(healthSample)
sampleAppender.Append(durationSample)
}
func (t *Target) scrape(sampleAppender storage.SampleAppender) (err error) {
start := time.Now()
baseLabels := t.BaseLabels()
defer func() {
t.status.setLastError(err)
recordScrapeHealth(sampleAppender, clientmodel.TimestampFromTime(start), baseLabels, t.status.Health(), time.Since(start))
}()
req, err := http.NewRequest("GET", t.URL(), nil)
if err != nil {
panic(err)
}
req.Header.Add("Accept", acceptHeader)
resp, err := t.httpClient.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("server returned HTTP status %s", resp.Status)
}
processor, err := extraction.ProcessorForRequestHeader(resp.Header)
if err != nil {
return err
}
t.ingestedSamples = make(chan clientmodel.Samples, ingestedSamplesCap)
processOptions := &extraction.ProcessOptions{
Timestamp: clientmodel.TimestampFromTime(start),
}
go func() {
err = processor.ProcessSingle(resp.Body, t, processOptions)
close(t.ingestedSamples)
}()
for samples := range t.ingestedSamples {
for _, s := range samples {
s.Metric.MergeFromLabelSet(baseLabels, clientmodel.ExporterLabelPrefix)
// Avoid the copy in Relabel if there are no configs.
if len(t.metricRelabelConfigs) > 0 {
labels, err := Relabel(clientmodel.LabelSet(s.Metric), t.metricRelabelConfigs...)
if err != nil {
log.Errorf("error while relabeling metric %s of instance %s: ", s.Metric, t.url, err)
continue
}
// Check if the timeseries was dropped.
if labels == nil {
continue
}
s.Metric = clientmodel.Metric(labels)
}
sampleAppender.Append(s)
}
}
return err
}
// RunScraper implements Target.
func (t *Target) RunScraper(sampleAppender storage.SampleAppender) {
defer close(t.scraperStopped)
lastScrapeInterval := t.interval()
log.Debugf("Starting scraper for target %v...", t)
select {
case <-time.After(t.offset(lastScrapeInterval)):
// Continue after scraping offset.
case <-t.scraperStopping:
return
}
ticker := time.NewTicker(lastScrapeInterval)
defer ticker.Stop()
t.scrape(sampleAppender)
// Explanation of the contraption below:
//
// In case t.scraperStopping has something to receive, we want to read
// from that channel rather than starting a new scrape (which might take very
// long). That's why the outer select has no ticker.C. Should t.scraperStopping
// not have anything to receive, we go into the inner select, where ticker.C
// is in the mix.
for {
select {
case <-t.scraperStopping:
return
default:
select {
case <-t.scraperStopping:
return
case <-ticker.C:
took := time.Since(t.status.LastScrape())
intervalStr := lastScrapeInterval.String()
// On changed scrape interval the new interval becomes effective
// after the next scrape.
if iv := t.interval(); iv != lastScrapeInterval {
ticker.Stop()
ticker = time.NewTicker(iv)
lastScrapeInterval = iv
}
targetIntervalLength.WithLabelValues(intervalStr).Observe(
float64(took) / float64(time.Second), // Sub-second precision.
)
if sampleAppender.NeedsThrottling() {
targetSkippedScrapes.WithLabelValues(intervalStr).Inc()
t.status.setLastError(errSkippedScrape)
continue
}
t.scrape(sampleAppender)
}
}
}
}
// append the defined time series to the storage.
func (cmd *loadCmd) append(a storage.SampleAppender) {
for fp, samples := range cmd.defs {
met := cmd.metrics[fp]
for _, smpl := range samples {
s := &clientmodel.Sample{
Metric: met,
Value: smpl.Value,
Timestamp: smpl.Timestamp,
}
a.Append(s)
}
}
}
func recordScrapeHealth(
sampleAppender storage.SampleAppender,
timestamp clientmodel.Timestamp,
baseLabels clientmodel.LabelSet,
health TargetHealth,
scrapeDuration time.Duration,
) {
healthMetric := make(clientmodel.Metric, len(baseLabels)+1)
durationMetric := make(clientmodel.Metric, len(baseLabels)+1)
healthMetric[clientmodel.MetricNameLabel] = clientmodel.LabelValue(scrapeHealthMetricName)
durationMetric[clientmodel.MetricNameLabel] = clientmodel.LabelValue(scrapeDurationMetricName)
for label, value := range baseLabels {
healthMetric[label] = value
durationMetric[label] = value
}
healthValue := clientmodel.SampleValue(0)
if health == HealthGood {
healthValue = clientmodel.SampleValue(1)
}
healthSample := &clientmodel.Sample{
Metric: healthMetric,
Timestamp: timestamp,
Value: healthValue,
}
durationSample := &clientmodel.Sample{
Metric: durationMetric,
Timestamp: timestamp,
Value: clientmodel.SampleValue(float64(scrapeDuration) / float64(time.Second)),
}
sampleAppender.Append(healthSample)
sampleAppender.Append(durationSample)
}
func (t *Target) scrape(appender storage.SampleAppender) (err error) {
start := time.Now()
baseLabels := t.BaseLabels()
defer func(appender storage.SampleAppender) {
t.status.setLastError(err)
recordScrapeHealth(appender, start, baseLabels, t.status.Health(), time.Since(start))
}(appender)
t.RLock()
// The relabelAppender has to be inside the label-modifying appenders
// so the relabeling rules are applied to the correct label set.
if len(t.metricRelabelConfigs) > 0 {
appender = relabelAppender{
app: appender,
relabelings: t.metricRelabelConfigs,
}
}
if t.honorLabels {
appender = honorLabelsAppender{
app: appender,
labels: baseLabels,
}
} else {
appender = ruleLabelsAppender{
app: appender,
labels: baseLabels,
}
}
httpClient := t.httpClient
t.RUnlock()
req, err := http.NewRequest("GET", t.URL().String(), nil)
if err != nil {
return err
}
req.Header.Add("Accept", acceptHeader)
resp, err := httpClient.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("server returned HTTP status %s", resp.Status)
}
dec := expfmt.NewDecoder(resp.Body, expfmt.ResponseFormat(resp.Header))
sdec := expfmt.SampleDecoder{
Dec: dec,
Opts: &expfmt.DecodeOptions{
Timestamp: model.TimeFromUnixNano(start.UnixNano()),
},
}
t.ingestedSamples = make(chan model.Vector, ingestedSamplesCap)
go func() {
for {
// TODO(fabxc): Change the SampleAppender interface to return an error
// so we can proceed based on the status and don't leak goroutines trying
// to append a single sample after dropping all the other ones.
//
// This will also allow use to reuse this vector and save allocations.
var samples model.Vector
if err = sdec.Decode(&samples); err != nil {
break
}
if err = t.ingest(samples); err != nil {
break
}
}
close(t.ingestedSamples)
}()
for samples := range t.ingestedSamples {
for _, s := range samples {
appender.Append(s)
}
}
if err == io.EOF {
return nil
}
return err
}
func (t *Target) scrape(sampleAppender storage.SampleAppender) (err error) {
start := time.Now()
baseLabels := t.BaseLabels()
defer func() {
t.status.setLastError(err)
recordScrapeHealth(sampleAppender, clientmodel.TimestampFromTime(start), baseLabels, t.status.Health(), time.Since(start))
}()
req, err := http.NewRequest("GET", t.URL().String(), nil)
if err != nil {
panic(err)
}
req.Header.Add("Accept", acceptHeader)
resp, err := t.httpClient.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("server returned HTTP status %s", resp.Status)
}
processor, err := extraction.ProcessorForRequestHeader(resp.Header)
if err != nil {
return err
}
t.ingestedSamples = make(chan clientmodel.Samples, ingestedSamplesCap)
processOptions := &extraction.ProcessOptions{
Timestamp: clientmodel.TimestampFromTime(start),
}
go func() {
err = processor.ProcessSingle(resp.Body, t, processOptions)
close(t.ingestedSamples)
}()
for samples := range t.ingestedSamples {
for _, s := range samples {
if t.honorLabels {
// Merge the metric with the baseLabels for labels not already set in the
// metric. This also considers labels explicitly set to the empty string.
for ln, lv := range baseLabels {
if _, ok := s.Metric[ln]; !ok {
s.Metric[ln] = lv
}
}
} else {
// Merge the ingested metric with the base label set. On a collision the
// value of the label is stored in a label prefixed with the exported prefix.
for ln, lv := range baseLabels {
if v, ok := s.Metric[ln]; ok && v != "" {
s.Metric[clientmodel.ExportedLabelPrefix+ln] = v
}
s.Metric[ln] = lv
}
}
// Avoid the copy in Relabel if there are no configs.
if len(t.metricRelabelConfigs) > 0 {
labels, err := Relabel(clientmodel.LabelSet(s.Metric), t.metricRelabelConfigs...)
if err != nil {
log.Errorf("Error while relabeling metric %s of instance %s: %s", s.Metric, t.url, err)
continue
}
// Check if the timeseries was dropped.
if labels == nil {
continue
}
s.Metric = clientmodel.Metric(labels)
}
sampleAppender.Append(s)
}
}
return err
}
func (t *Target) scrape(appender storage.SampleAppender) error {
var (
err error
start = time.Now()
)
defer func(appender storage.SampleAppender) {
t.report(appender, start, time.Since(start), err)
}(appender)
t.RLock()
appender = t.wrapAppender(appender)
client := t.httpClient
t.RUnlock()
req, err := http.NewRequest("GET", t.URL().String(), nil)
if err != nil {
return err
}
req.Header.Add("Accept", acceptHeader)
ctx, _ := context.WithTimeout(context.Background(), t.timeout())
resp, err := ctxhttp.Do(ctx, client, req)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("server returned HTTP status %s", resp.Status)
}
dec := expfmt.NewDecoder(resp.Body, expfmt.ResponseFormat(resp.Header))
sdec := expfmt.SampleDecoder{
Dec: dec,
Opts: &expfmt.DecodeOptions{
Timestamp: model.TimeFromUnixNano(start.UnixNano()),
},
}
var (
samples model.Vector
numOutOfOrder int
logger = log.With("target", t.InstanceIdentifier())
)
for {
if err = sdec.Decode(&samples); err != nil {
break
}
for _, s := range samples {
err := appender.Append(s)
if err != nil {
if err == local.ErrOutOfOrderSample {
numOutOfOrder++
} else {
logger.With("sample", s).Warnf("Error inserting sample: %s", err)
}
}
}
}
if numOutOfOrder > 0 {
logger.With("numDropped", numOutOfOrder).Warn("Error on ingesting out-of-order samples")
}
if err == io.EOF {
// Set err to nil since it is used in the scrape health recording.
err = nil
}
return err
}
func (t *Target) scrape(sampleAppender storage.SampleAppender) (err error) {
start := time.Now()
baseLabels := t.BaseLabels()
t.RLock()
var (
honorLabels = t.honorLabels
httpClient = t.httpClient
metricRelabelConfigs = t.metricRelabelConfigs
)
t.RUnlock()
defer func() {
t.status.setLastError(err)
recordScrapeHealth(sampleAppender, start, baseLabels, t.status.Health(), time.Since(start))
}()
req, err := http.NewRequest("GET", t.URL().String(), nil)
if err != nil {
panic(err)
}
req.Header.Add("Accept", acceptHeader)
resp, err := httpClient.Do(req)
if err != nil {
return err
}
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("server returned HTTP status %s", resp.Status)
}
dec, err := expfmt.NewDecoder(resp.Body, resp.Header)
if err != nil {
return err
}
defer resp.Body.Close()
sdec := expfmt.SampleDecoder{
Dec: dec,
Opts: &expfmt.DecodeOptions{
Timestamp: model.TimeFromUnixNano(start.UnixNano()),
},
}
t.ingestedSamples = make(chan model.Vector, ingestedSamplesCap)
go func() {
for {
// TODO(fabxc): Changex the SampleAppender interface to return an error
// so we can proceed based on the status and don't leak goroutines trying
// to append a single sample after dropping all the other ones.
//
// This will also allow use to reuse this vector and save allocations.
var samples model.Vector
if err = sdec.Decode(&samples); err != nil {
break
}
if err = t.ingest(samples); err != nil {
break
}
}
close(t.ingestedSamples)
}()
for samples := range t.ingestedSamples {
for _, s := range samples {
if honorLabels {
// Merge the metric with the baseLabels for labels not already set in the
// metric. This also considers labels explicitly set to the empty string.
for ln, lv := range baseLabels {
if _, ok := s.Metric[ln]; !ok {
s.Metric[ln] = lv
}
}
} else {
// Merge the ingested metric with the base label set. On a collision the
// value of the label is stored in a label prefixed with the exported prefix.
for ln, lv := range baseLabels {
if v, ok := s.Metric[ln]; ok && v != "" {
s.Metric[model.ExportedLabelPrefix+ln] = v
}
s.Metric[ln] = lv
}
}
// Avoid the copy in Relabel if there are no configs.
if len(metricRelabelConfigs) > 0 {
labels, err := Relabel(model.LabelSet(s.Metric), metricRelabelConfigs...)
if err != nil {
log.Errorf("Error while relabeling metric %s of instance %s: %s", s.Metric, req.URL, err)
continue
}
// Check if the timeseries was dropped.
if labels == nil {
continue
}
s.Metric = model.Metric(labels)
}
sampleAppender.Append(s)
}
}
if err == io.EOF {
return nil
}
return err
}
func (t *Target) scrape(appender storage.SampleAppender) (err error) {
start := time.Now()
baseLabels := t.BaseLabels()
defer func(appender storage.SampleAppender) {
t.status.setLastError(err)
recordScrapeHealth(appender, start, baseLabels, t.status.Health(), time.Since(start))
}(appender)
t.RLock()
// The relabelAppender has to be inside the label-modifying appenders
// so the relabeling rules are applied to the correct label set.
if len(t.metricRelabelConfigs) > 0 {
appender = relabelAppender{
SampleAppender: appender,
relabelings: t.metricRelabelConfigs,
}
}
if t.honorLabels {
appender = honorLabelsAppender{
SampleAppender: appender,
labels: baseLabels,
}
} else {
appender = ruleLabelsAppender{
SampleAppender: appender,
labels: baseLabels,
}
}
httpClient := t.httpClient
t.RUnlock()
req, err := http.NewRequest("GET", t.URL().String(), nil)
if err != nil {
return err
}
req.Header.Add("Accept", acceptHeader)
resp, err := httpClient.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("server returned HTTP status %s", resp.Status)
}
dec := expfmt.NewDecoder(resp.Body, expfmt.ResponseFormat(resp.Header))
sdec := expfmt.SampleDecoder{
Dec: dec,
Opts: &expfmt.DecodeOptions{
Timestamp: model.TimeFromUnixNano(start.UnixNano()),
},
}
var (
samples model.Vector
numOutOfOrder int
logger = log.With("target", t.InstanceIdentifier())
)
for {
if err = sdec.Decode(&samples); err != nil {
break
}
for _, s := range samples {
err := appender.Append(s)
if err != nil {
if err == local.ErrOutOfOrderSample {
numOutOfOrder++
} else {
logger.With("sample", s).Warnf("Error inserting sample: %s", err)
}
}
}
}
if numOutOfOrder > 0 {
logger.With("numDropped", numOutOfOrder).Warn("Error on ingesting out-of-order samples")
}
if err == io.EOF {
return nil
}
return err
}
