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// Copyright 2022 Prometheus Team
// 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 webex
import (
"bytes"
"context"
"encoding/json"
"log/slog"
"net/http"
commoncfg "github.com/prometheus/common/config"
"github.com/prometheus/alertmanager/config"
"github.com/prometheus/alertmanager/notify"
"github.com/prometheus/alertmanager/template"
"github.com/prometheus/alertmanager/types"
)
const (
// nolint:godot
// maxMessageSize represents the maximum message length that Webex supports.
maxMessageSize = 7439
)
type Notifier struct {
conf *config.WebexConfig
tmpl *template.Template
logger *slog.Logger
client *http.Client
retrier *notify.Retrier
}
// New returns a new Webex notifier.
func New(c *config.WebexConfig, t *template.Template, l *slog.Logger, httpOpts ...commoncfg.HTTPClientOption) (*Notifier, error) {
client, err := commoncfg.NewClientFromConfig(*c.HTTPConfig, "webex", httpOpts...)
if err != nil {
return nil, err
}
n := &Notifier{
conf: c,
tmpl: t,
logger: l,
client: client,
retrier: ¬ify.Retrier{},
}
return n, nil
}
type webhook struct {
Markdown string `json:"markdown"`
RoomID string `json:"roomId,omitempty"`
}
// Notify implements the Notifier interface.
func (n *Notifier) Notify(ctx context.Context, as ...*types.Alert) (bool, error) {
key, err := notify.ExtractGroupKey(ctx)
if err != nil {
return false, err
}
n.logger.Debug("extracted group key", "key", key)
data := notify.GetTemplateData(ctx, n.tmpl, as, n.logger)
tmpl := notify.TmplText(n.tmpl, data, &err)
if err != nil {
return false, err
}
message := tmpl(n.conf.Message)
if err != nil {
return false, err
}
message, truncated := notify.TruncateInBytes(message, maxMessageSize)
if truncated {
n.logger.Debug("message truncated due to exceeding maximum allowed length by webex", "truncated_message", message)
}
w := webhook{
Markdown: message,
RoomID: tmpl(n.conf.RoomID),
}
var payload bytes.Buffer
if err = json.NewEncoder(&payload).Encode(w); err != nil {
return false, err
}
resp, err := notify.PostJSON(ctx, n.client, n.conf.APIURL.String(), &payload)
if err != nil {
return true, notify.RedactURL(err)
}
shouldRetry, err := n.retrier.Check(resp.StatusCode, resp.Body)
if err != nil {
return shouldRetry, err
}
return false, nil
}