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91 lines
2.6 KiB
91 lines
2.6 KiB
3 months ago
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// Copyright 2013 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package notifier
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import (
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"fmt"
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"net/url"
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"path"
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"github.com/prometheus/common/model"
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"github.com/prometheus/prometheus/config"
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"github.com/prometheus/prometheus/discovery/targetgroup"
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"github.com/prometheus/prometheus/model/labels"
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"github.com/prometheus/prometheus/model/relabel"
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)
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// Alertmanager holds Alertmanager endpoint information.
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type alertmanager interface {
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url() *url.URL
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}
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type alertmanagerLabels struct{ labels.Labels }
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const pathLabel = "__alerts_path__"
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func (a alertmanagerLabels) url() *url.URL {
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return &url.URL{
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Scheme: a.Get(model.SchemeLabel),
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Host: a.Get(model.AddressLabel),
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Path: a.Get(pathLabel),
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}
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}
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// AlertmanagerFromGroup extracts a list of alertmanagers from a target group
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// and an associated AlertmanagerConfig.
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func AlertmanagerFromGroup(tg *targetgroup.Group, cfg *config.AlertmanagerConfig) ([]alertmanager, []alertmanager, error) {
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var res []alertmanager
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var droppedAlertManagers []alertmanager
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lb := labels.NewBuilder(labels.EmptyLabels())
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for _, tlset := range tg.Targets {
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lb.Reset(labels.EmptyLabels())
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for ln, lv := range tlset {
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lb.Set(string(ln), string(lv))
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}
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// Set configured scheme as the initial scheme label for overwrite.
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lb.Set(model.SchemeLabel, cfg.Scheme)
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lb.Set(pathLabel, postPath(cfg.PathPrefix, cfg.APIVersion))
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// Combine target labels with target group labels.
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for ln, lv := range tg.Labels {
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if _, ok := tlset[ln]; !ok {
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lb.Set(string(ln), string(lv))
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}
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}
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preRelabel := lb.Labels()
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keep := relabel.ProcessBuilder(lb, cfg.RelabelConfigs...)
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if !keep {
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droppedAlertManagers = append(droppedAlertManagers, alertmanagerLabels{preRelabel})
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continue
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}
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addr := lb.Get(model.AddressLabel)
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if err := config.CheckTargetAddress(model.LabelValue(addr)); err != nil {
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return nil, nil, err
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}
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res = append(res, alertmanagerLabels{lb.Labels()})
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}
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return res, droppedAlertManagers, nil
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}
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func postPath(pre string, v config.AlertmanagerAPIVersion) string {
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alertPushEndpoint := fmt.Sprintf("/api/%v/alerts", string(v))
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return path.Join("/", pre, alertPushEndpoint)
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}
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