Golang strutil.GraphLinkForExpression函数代码示例

// HTMLSnippet returns an HTML snippet representing this rule.
func (rule RecordingRule) HTMLSnippet(pathPrefix string) template.HTML {
	ruleExpr := rule.vector.String()
	return template.HTML(fmt.Sprintf(
		`<a href="%s">%s</a>%s = <a href="%s">%s</a>`,
		pathPrefix+strutil.GraphLinkForExpression(rule.name),
		rule.name,
		template.HTMLEscapeString(rule.labels.String()),
		pathPrefix+strutil.GraphLinkForExpression(ruleExpr),
		template.HTMLEscapeString(ruleExpr)))
}

// HTMLSnippet returns an HTML snippet representing this alerting rule.
func (rule *AlertingRule) HTMLSnippet(pathPrefix string) template.HTML {
	alertMetric := clientmodel.Metric{
		clientmodel.MetricNameLabel: alertMetricName,
		alertNameLabel:              clientmodel.LabelValue(rule.name),
	}
	return template.HTML(fmt.Sprintf(
		`ALERT <a href="%s">%s</a> IF <a href="%s">%s</a> FOR %s WITH %s`,
		pathPrefix+strutil.GraphLinkForExpression(alertMetric.String()),
		rule.name,
		pathPrefix+strutil.GraphLinkForExpression(rule.vector.String()),
		rule.vector,
		strutil.DurationToString(rule.holdDuration),
		rule.labels))
}

// sendAlerts sends alert notifications for the given rule.
func (g *Group) sendAlerts(rule *AlertingRule, timestamp model.Time) error {
	var alerts model.Alerts

	for _, alert := range rule.currentAlerts() {
		// Only send actually firing alerts.
		if alert.State == StatePending {
			continue
		}

		a := &model.Alert{
			StartsAt:     alert.ActiveAt.Add(rule.holdDuration).Time(),
			Labels:       alert.Labels,
			Annotations:  alert.Annotations,
			GeneratorURL: g.opts.ExternalURL.String() + strutil.GraphLinkForExpression(rule.vector.String()),
		}
		if alert.ResolvedAt != 0 {
			a.EndsAt = alert.ResolvedAt.Time()
		}

		alerts = append(alerts, a)
	}

	if len(alerts) > 0 {
		g.opts.Notifier.Send(alerts...)
	}

	return nil
}

// HTMLSnippet returns an HTML snippet representing this alerting rule. The
// resulting snippet is expected to be presented in a <pre> element, so that
// line breaks and other returned whitespace is respected.
func (rule *AlertingRule) HTMLSnippet(pathPrefix string) template.HTML {
	alertMetric := model.Metric{
		model.MetricNameLabel: alertMetricName,
		alertNameLabel:        model.LabelValue(rule.name),
	}
	s := fmt.Sprintf("ALERT <a href=%q>%s</a>", pathPrefix+strutil.GraphLinkForExpression(alertMetric.String()), rule.name)
	s += fmt.Sprintf("\n  IF <a href=%q>%s</a>", pathPrefix+strutil.GraphLinkForExpression(rule.vector.String()), rule.vector)
	if rule.holdDuration > 0 {
		s += fmt.Sprintf("\n  FOR %s", strutil.DurationToString(rule.holdDuration))
	}
	if len(rule.labels) > 0 {
		s += fmt.Sprintf("\n  WITH %s", rule.labels)
	}
	if len(rule.annotations) > 0 {
		s += fmt.Sprintf("\n  ANNOTATIONS %s", rule.annotations)
	}
	return template.HTML(s)
}

// HTMLSnippet returns an HTML snippet representing this alerting rule. The
// resulting snippet is expected to be presented in a <pre> element, so that
// line breaks and other returned whitespace is respected.
func (r *AlertingRule) HTMLSnippet(pathPrefix string) html_template.HTML {
	alertMetric := model.Metric{
		model.MetricNameLabel: alertMetricName,
		alertNameLabel:        model.LabelValue(r.name),
	}
	s := fmt.Sprintf("ALERT <a href=%q>%s</a>", pathPrefix+strutil.GraphLinkForExpression(alertMetric.String()), r.name)
	s += fmt.Sprintf("\n  IF <a href=%q>%s</a>", pathPrefix+strutil.GraphLinkForExpression(r.vector.String()), html_template.HTMLEscapeString(r.vector.String()))
	if r.holdDuration > 0 {
		s += fmt.Sprintf("\n  FOR %s", model.Duration(r.holdDuration))
	}
	if len(r.labels) > 0 {
		s += fmt.Sprintf("\n  LABELS %s", html_template.HTMLEscapeString(r.labels.String()))
	}
	if len(r.annotations) > 0 {
		s += fmt.Sprintf("\n  ANNOTATIONS %s", html_template.HTMLEscapeString(r.annotations.String()))
	}
	return html_template.HTML(s)
}

// HTMLSnippet returns an HTML snippet representing this alerting rule. The
// resulting snippet is expected to be presented in a <pre> element, so that
// line breaks and other returned whitespace is respected.
func (rule *AlertingRule) HTMLSnippet(pathPrefix string) template.HTML {
	alertMetric := model.Metric{
		model.MetricNameLabel: alertMetricName,
		alertNameLabel:        model.LabelValue(rule.name),
	}
	s := fmt.Sprintf("ALERT <a href=%q>%s</a>", pathPrefix+strutil.GraphLinkForExpression(alertMetric.String()), rule.name)
	s += fmt.Sprintf("\n  IF <a href=%q>%s</a>", pathPrefix+strutil.GraphLinkForExpression(rule.vector.String()), rule.vector)
	if rule.holdDuration > 0 {
		s += fmt.Sprintf("\n  FOR %s", strutil.DurationToString(rule.holdDuration))
	}
	if len(rule.labels) > 0 {
		s += fmt.Sprintf("\n  WITH %s", rule.labels)
	}
	s += fmt.Sprintf("\n  SUMMARY %q", rule.summary)
	s += fmt.Sprintf("\n  DESCRIPTION %q", rule.description)
	s += fmt.Sprintf("\n  RUNBOOK %q", rule.runbook)
	return template.HTML(s)
}

func (m *Manager) queueAlertNotifications(rule *AlertingRule, timestamp clientmodel.Timestamp) {
	activeAlerts := rule.ActiveAlerts()
	if len(activeAlerts) == 0 {
		return
	}

	notifications := make(notification.NotificationReqs, 0, len(activeAlerts))
	for _, aa := range activeAlerts {
		if aa.State != StateFiring {
			// BUG: In the future, make AlertManager support pending alerts?
			continue
		}

		// Provide the alert information to the template.
		l := map[string]string{}
		for k, v := range aa.Labels {
			l[string(k)] = string(v)
		}
		tmplData := struct {
			Labels map[string]string
			Value  clientmodel.SampleValue
		}{
			Labels: l,
			Value:  aa.Value,
		}
		// Inject some convenience variables that are easier to remember for users
		// who are not used to Go's templating system.
		defs := "{{$labels := .Labels}}{{$value := .Value}}"

		expand := func(text string) string {
			tmpl := template.NewTemplateExpander(defs+text, "__alert_"+rule.Name(), tmplData, timestamp, m.queryEngine, m.externalURL.Path)
			result, err := tmpl.Expand()
			if err != nil {
				result = err.Error()
				log.Warnf("Error expanding alert template %v with data '%v': %v", rule.Name(), tmplData, err)
			}
			return result
		}

		notifications = append(notifications, &notification.NotificationReq{
			Summary:     expand(rule.summary),
			Description: expand(rule.description),
			Runbook:     rule.runbook,
			Labels: aa.Labels.Merge(clientmodel.LabelSet{
				alertNameLabel: clientmodel.LabelValue(rule.Name()),
			}),
			Value:        aa.Value,
			ActiveSince:  aa.ActiveSince.Time(),
			RuleString:   rule.String(),
			GeneratorURL: m.externalURL.String() + strutil.GraphLinkForExpression(rule.vector.String()),
		})
	}
	m.notificationHandler.SubmitReqs(notifications)
}

// sendAlerts sends alert notifications for the given rule.
func (g *Group) sendAlerts(rule *AlertingRule, timestamp model.Time) error {
	var alerts model.Alerts

	for _, alert := range rule.currentAlerts() {
		// Only send actually firing alerts.
		if alert.State == StatePending {
			continue
		}

		// Provide the alert information to the template.
		l := make(map[string]string, len(alert.Labels))
		for k, v := range alert.Labels {
			l[string(k)] = string(v)
		}

		tmplData := struct {
			Labels map[string]string
			Value  float64
		}{
			Labels: l,
			Value:  float64(alert.Value),
		}
		// Inject some convenience variables that are easier to remember for users
		// who are not used to Go's templating system.
		defs := "{{$labels := .Labels}}{{$value := .Value}}"

		expand := func(text model.LabelValue) model.LabelValue {
			tmpl := template.NewTemplateExpander(
				defs+string(text),
				"__alert_"+rule.Name(),
				tmplData,
				timestamp,
				g.opts.QueryEngine,
				g.opts.ExternalURL.Path,
			)
			result, err := tmpl.Expand()
			if err != nil {
				result = fmt.Sprintf("<error expanding template: %s>", err)
				log.Warnf("Error expanding alert template %v with data '%v': %s", rule.Name(), tmplData, err)
			}
			return model.LabelValue(result)
		}

		labels := make(model.LabelSet, len(alert.Labels)+1)
		for ln, lv := range alert.Labels {
			labels[ln] = expand(lv)
		}
		labels[model.AlertNameLabel] = model.LabelValue(rule.Name())

		annotations := make(model.LabelSet, len(rule.annotations))
		for an, av := range rule.annotations {
			annotations[an] = expand(av)
		}

		a := &model.Alert{
			StartsAt:     alert.ActiveAt.Add(rule.holdDuration).Time(),
			Labels:       labels,
			Annotations:  annotations,
			GeneratorURL: g.opts.ExternalURL.String() + strutil.GraphLinkForExpression(rule.vector.String()),
		}
		if alert.ResolvedAt != 0 {
			a.EndsAt = alert.ResolvedAt.Time()
		}

		alerts = append(alerts, a)
	}

	if len(alerts) > 0 {
		g.opts.NotificationHandler.Send(alerts...)
	}

	return nil
}