92 lines
2.4 KiB
Go
92 lines
2.4 KiB
Go
// Copyright 2020 Google LLC
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//
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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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// https://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 main
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import (
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"bytes"
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"encoding/json"
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"net/url"
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"strings"
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"text/template"
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"github.com/google/alertmanager-irc-relay/logging"
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promtmpl "github.com/prometheus/alertmanager/template"
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)
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type Formatter struct {
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MsgTemplate *template.Template
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MsgOnce bool
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}
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func NewFormatter(config *Config) (*Formatter, error) {
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funcMap := template.FuncMap{
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"ToUpper": strings.ToUpper,
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"ToLower": strings.ToLower,
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"Join": strings.Join,
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"QueryEscape": url.QueryEscape,
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"PathEscape": url.PathEscape,
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}
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tmpl, err := template.New("msg").Funcs(funcMap).Parse(config.MsgTemplate)
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if err != nil {
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return nil, err
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}
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return &Formatter{
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MsgTemplate: tmpl,
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MsgOnce: config.MsgOnce,
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}, nil
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}
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func (f *Formatter) FormatMsg(ircChannel string, data interface{}) []string {
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output := bytes.Buffer{}
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var msg string
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if err := f.MsgTemplate.Execute(&output, data); err != nil {
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msg_bytes, _ := json.Marshal(data)
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msg = string(msg_bytes)
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logging.Error("Could not apply msg template on alert (%s): %s",
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err, msg)
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logging.Warn("Sending raw alert")
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alertHandlingErrors.WithLabelValues(ircChannel, "format_msg").Inc()
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} else {
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msg = output.String()
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}
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// Do not send to IRC messages with newlines, split in multiple messages instead.
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newLinesSplit := func(r rune) bool {
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return r == '\n' || r == '\r'
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}
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return strings.FieldsFunc(msg, newLinesSplit)
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}
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func (f *Formatter) GetMsgsFromAlertMessage(ircChannel string,
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data *promtmpl.Data) []AlertMsg {
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msgs := []AlertMsg{}
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if f.MsgOnce {
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for _, msg := range f.FormatMsg(ircChannel, data) {
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msgs = append(msgs,
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AlertMsg{Channel: ircChannel, Alert: msg})
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}
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} else {
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for _, alert := range data.Alerts {
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for _, msg := range f.FormatMsg(ircChannel, alert) {
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msgs = append(msgs,
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AlertMsg{Channel: ircChannel, Alert: msg})
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}
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}
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}
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return msgs
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}
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