prometheus/web/alerts.go

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// Copyright 2013 The Prometheus Authors
// 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 web
import (
"net/http"
"sort"
"sync"
"github.com/prometheus/prometheus/rules"
)
// AlertStatus bundles alerting rules and the mapping of alert states to row
// classes.
type AlertStatus struct {
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AlertingRules []*rules.AlertingRule
AlertStateToRowClass map[rules.AlertState]string
}
type byAlertStateSorter struct {
alerts []*rules.AlertingRule
}
func (s byAlertStateSorter) Len() int {
return len(s.alerts)
}
func (s byAlertStateSorter) Less(i, j int) bool {
return s.alerts[i].State() > s.alerts[j].State()
}
func (s byAlertStateSorter) Swap(i, j int) {
s.alerts[i], s.alerts[j] = s.alerts[j], s.alerts[i]
}
// AlertsHandler implements http.Handler.
type AlertsHandler struct {
RuleManager rules.RuleManager
PathPrefix string
mutex sync.Mutex
}
func (h *AlertsHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
h.mutex.Lock()
defer h.mutex.Unlock()
alerts := h.RuleManager.AlertingRules()
alertsSorter := byAlertStateSorter{alerts: alerts}
sort.Sort(alertsSorter)
alertStatus := AlertStatus{
AlertingRules: alertsSorter.alerts,
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AlertStateToRowClass: map[rules.AlertState]string{
rules.Inactive: "success",
rules.Pending: "warning",
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rules.Firing: "danger",
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},
}
executeTemplate(w, "alerts", alertStatus, h.PathPrefix)
}