135 lines
3.5 KiB
Go
135 lines
3.5 KiB
Go
// Copyright 2019 Prometheus Team
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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 webhook
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import (
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"bytes"
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"context"
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"encoding/json"
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"fmt"
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"io"
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"net/http"
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"os"
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"github.com/go-kit/log"
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"github.com/go-kit/log/level"
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commoncfg "github.com/prometheus/common/config"
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"github.com/prometheus/alertmanager/config"
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"github.com/prometheus/alertmanager/notify"
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"github.com/prometheus/alertmanager/template"
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"github.com/prometheus/alertmanager/types"
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)
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// Notifier implements a Notifier for generic webhooks.
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type Notifier struct {
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conf *config.WebhookConfig
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tmpl *template.Template
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logger log.Logger
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client *http.Client
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retrier *notify.Retrier
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}
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// New returns a new Webhook.
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func New(conf *config.WebhookConfig, t *template.Template, l log.Logger, httpOpts ...commoncfg.HTTPClientOption) (*Notifier, error) {
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client, err := commoncfg.NewClientFromConfig(*conf.HTTPConfig, "webhook", httpOpts...)
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if err != nil {
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return nil, err
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}
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return &Notifier{
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conf: conf,
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tmpl: t,
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logger: l,
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client: client,
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// Webhooks are assumed to respond with 2xx response codes on a successful
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// request and 5xx response codes are assumed to be recoverable.
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retrier: ¬ify.Retrier{
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CustomDetailsFunc: func(_ int, body io.Reader) string {
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return errDetails(body, conf.URL.String())
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},
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},
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}, nil
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}
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// Message defines the JSON object send to webhook endpoints.
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type Message struct {
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*template.Data
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// The protocol version.
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Version string `json:"version"`
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GroupKey string `json:"groupKey"`
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TruncatedAlerts uint64 `json:"truncatedAlerts"`
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}
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func truncateAlerts(maxAlerts uint64, alerts []*types.Alert) ([]*types.Alert, uint64) {
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if maxAlerts != 0 && uint64(len(alerts)) > maxAlerts {
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return alerts[:maxAlerts], uint64(len(alerts)) - maxAlerts
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}
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return alerts, 0
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}
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// Notify implements the Notifier interface.
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func (n *Notifier) Notify(ctx context.Context, alerts ...*types.Alert) (bool, error) {
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alerts, numTruncated := truncateAlerts(n.conf.MaxAlerts, alerts)
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data := notify.GetTemplateData(ctx, n.tmpl, alerts, n.logger)
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groupKey, err := notify.ExtractGroupKey(ctx)
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if err != nil {
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level.Error(n.logger).Log("err", err)
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}
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msg := &Message{
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Version: "4",
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Data: data,
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GroupKey: groupKey.String(),
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TruncatedAlerts: numTruncated,
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}
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var buf bytes.Buffer
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if err := json.NewEncoder(&buf).Encode(msg); err != nil {
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return false, err
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}
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var url string
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if n.conf.URL != nil {
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url = n.conf.URL.String()
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} else {
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content, err := os.ReadFile(n.conf.URLFile)
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if err != nil {
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return false, fmt.Errorf("read url_file: %w", err)
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}
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url = string(content)
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}
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resp, err := notify.PostJSON(ctx, n.client, url, &buf)
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if err != nil {
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return true, notify.RedactURL(err)
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}
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defer notify.Drain(resp)
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return n.retrier.Check(resp.StatusCode, resp.Body)
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}
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func errDetails(body io.Reader, url string) string {
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if body == nil {
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return url
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}
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bs, err := io.ReadAll(body)
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if err != nil {
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return url
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}
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return fmt.Sprintf("%s: %s", url, string(bs))
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}
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