Merge pull request #10 from filippog/template-functions

Introduce template functions
This commit is contained in:
Luca Bigliardi 2020-11-05 09:50:55 +01:00 committed by GitHub
commit d89858e51c
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4 changed files with 198 additions and 110 deletions

80
format.go Normal file
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@ -0,0 +1,80 @@
// Copyright 2020 Google LLC
//
// 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
//
// https://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 main
import (
"bytes"
"encoding/json"
"log"
"strings"
"text/template"
promtmpl "github.com/prometheus/alertmanager/template"
)
type Formatter struct {
MsgTemplate *template.Template
MsgOnce bool
}
func NewFormatter(config *Config) (*Formatter, error) {
funcMap := template.FuncMap{
"ToUpper": strings.ToUpper,
"ToLower": strings.ToLower,
"Join": strings.Join,
}
tmpl, err := template.New("msg").Funcs(funcMap).Parse(config.MsgTemplate)
if err != nil {
return nil, err
}
return &Formatter{
MsgTemplate: tmpl,
MsgOnce: config.MsgOnce,
}, nil
}
func (f *Formatter) FormatMsg(ircChannel string, data interface{}) string {
output := bytes.Buffer{}
var msg string
if err := f.MsgTemplate.Execute(&output, data); err != nil {
msg_bytes, _ := json.Marshal(data)
msg = string(msg_bytes)
log.Printf("Could not apply msg template on alert (%s): %s",
err, msg)
log.Printf("Sending raw alert")
alertHandlingErrors.WithLabelValues(ircChannel, "format_msg").Inc()
} else {
msg = output.String()
}
return msg
}
func (f *Formatter) GetMsgsFromAlertMessage(ircChannel string,
data *promtmpl.Data) []AlertMsg {
msgs := []AlertMsg{}
if f.MsgOnce {
msg := f.FormatMsg(ircChannel, data)
msgs = append(msgs,
AlertMsg{Channel: ircChannel, Alert: msg})
} else {
for _, alert := range data.Alerts {
msg := f.FormatMsg(ircChannel, alert)
msgs = append(msgs,
AlertMsg{Channel: ircChannel, Alert: msg})
}
}
return msgs
}

114
format_test.go Normal file
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@ -0,0 +1,114 @@
// Copyright 2020 Google LLC
//
// 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
//
// https://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 main
import (
"encoding/json"
"fmt"
"reflect"
"testing"
promtmpl "github.com/prometheus/alertmanager/template"
)
func TestTemplateErrorsCreateRawAlertMsg(t *testing.T) {
testingConfig := Config{MsgTemplate: "Bogus template {{ nil }}"}
formatter, _ := NewFormatter(&testingConfig)
expectedAlertMsgs := []AlertMsg{
AlertMsg{
Channel: "#somechannel",
Alert: `{"status":"resolved","labels":{"alertname":"airDown","instance":"instance1:3456","job":"air","service":"prometheus","severity":"ticket","zone":"global"},"annotations":{"DESCRIPTION":"service /prometheus has irc gateway down on instance1","SUMMARY":"service /prometheus air down on instance1"},"startsAt":"2017-05-15T13:49:37.834Z","endsAt":"2017-05-15T13:50:37.835Z","generatorURL":"https://prometheus.example.com/prometheus/...","fingerprint":"66214a361160fb6f"}`,
},
AlertMsg{
Channel: "#somechannel",
Alert: `{"status":"resolved","labels":{"alertname":"airDown","instance":"instance2:7890","job":"air","service":"prometheus","severity":"ticket","zone":"global"},"annotations":{"DESCRIPTION":"service /prometheus has irc gateway down on instance2","SUMMARY":"service /prometheus air down on instance2"},"startsAt":"2017-05-15T11:47:37.834Z","endsAt":"2017-05-15T11:48:37.834Z","generatorURL":"https://prometheus.example.com/prometheus/...","fingerprint":"25a874c99325d1ce"}`,
},
}
var alertMessage = promtmpl.Data{}
if err := json.Unmarshal([]byte(testdataSimpleAlertJson), &alertMessage); err != nil {
t.Fatal(fmt.Sprintf("Could not unmarshal %s", testdataSimpleAlertJson))
}
alertMsgs := formatter.GetMsgsFromAlertMessage("#somechannel", &alertMessage)
if !reflect.DeepEqual(expectedAlertMsgs, alertMsgs) {
t.Error(fmt.Sprintf(
"Unexpected alert msg.\nExpected: %s\nActual: %s",
expectedAlertMsgs, alertMsgs))
}
}
func TestAlertsDispatchedOnce(t *testing.T) {
testingConfig := Config{
MsgTemplate: "Alert {{ .GroupLabels.alertname }} is {{ .Status }}",
MsgOnce: true,
}
formatter, _ := NewFormatter(&testingConfig)
expectedAlertMsgs := []AlertMsg{
AlertMsg{
Channel: "#somechannel",
Alert: "Alert airDown is resolved",
},
}
var alertMessage = promtmpl.Data{}
if err := json.Unmarshal([]byte(testdataSimpleAlertJson), &alertMessage); err != nil {
t.Fatal(fmt.Sprintf("Could not unmarshal %s", testdataSimpleAlertJson))
}
alertMsgs := formatter.GetMsgsFromAlertMessage("#somechannel", &alertMessage)
if !reflect.DeepEqual(expectedAlertMsgs, alertMsgs) {
t.Error(fmt.Sprintf(
"Unexpected alert msg.\nExpected: %s\nActual: %s",
expectedAlertMsgs, alertMsgs))
}
}
func TestStringsFunctions(t *testing.T) {
testingConfig := Config{
MsgTemplate: "Alert {{ .GroupLabels.alertname | ToUpper }} is {{ .Status }}",
MsgOnce: true,
}
formatter, _ := NewFormatter(&testingConfig)
expectedAlertMsgs := []AlertMsg{
AlertMsg{
Channel: "#somechannel",
Alert: "Alert AIRDOWN is resolved",
},
}
var alertMessage = promtmpl.Data{}
if err := json.Unmarshal([]byte(testdataSimpleAlertJson), &alertMessage); err != nil {
t.Fatal(fmt.Sprintf("Could not unmarshal %s", testdataSimpleAlertJson))
}
alertMsgs := formatter.GetMsgsFromAlertMessage("#somechannel", &alertMessage)
if !reflect.DeepEqual(expectedAlertMsgs, alertMsgs) {
t.Error(fmt.Sprintf(
"Unexpected alert msg.\nExpected: %s\nActual: %s",
expectedAlertMsgs, alertMsgs))
}
}

45
http.go
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@ -15,7 +15,6 @@
package main
import (
"bytes"
"encoding/json"
"io"
"io/ioutil"
@ -23,7 +22,6 @@ import (
"net/http"
"strconv"
"strings"
"text/template"
"github.com/gorilla/mux"
promtmpl "github.com/prometheus/alertmanager/template"
@ -56,8 +54,7 @@ type HTTPServer struct {
StoppedRunning chan bool
Addr string
Port int
MsgTemplate *template.Template
MsgOnce bool
formatter *Formatter
AlertMsgs chan AlertMsg
httpListener HTTPListener
}
@ -69,7 +66,7 @@ func NewHTTPServer(config *Config, alertMsgs chan AlertMsg) (
func NewHTTPServerForTesting(config *Config, alertMsgs chan AlertMsg,
httpListener HTTPListener) (*HTTPServer, error) {
tmpl, err := template.New("msg").Parse(config.MsgTemplate)
formatter, err := NewFormatter(config)
if err != nil {
return nil, err
}
@ -77,8 +74,7 @@ func NewHTTPServerForTesting(config *Config, alertMsgs chan AlertMsg,
StoppedRunning: make(chan bool),
Addr: config.HTTPHost,
Port: config.HTTPPort,
MsgTemplate: tmpl,
MsgOnce: config.MsgOnce,
formatter: formatter,
AlertMsgs: alertMsgs,
httpListener: httpListener,
}
@ -86,39 +82,6 @@ func NewHTTPServerForTesting(config *Config, alertMsgs chan AlertMsg,
return server, nil
}
func (server *HTTPServer) FormatMsg(ircChannel string, data interface{}) string {
output := bytes.Buffer{}
var msg string
if err := server.MsgTemplate.Execute(&output, data); err != nil {
msg_bytes, _ := json.Marshal(data)
msg = string(msg_bytes)
log.Printf("Could not apply msg template on alert (%s): %s",
err, msg)
log.Printf("Sending raw alert")
alertHandlingErrors.WithLabelValues(ircChannel, "format_msg").Inc()
} else {
msg = output.String()
}
return msg
}
func (server *HTTPServer) GetMsgsFromAlertMessage(ircChannel string,
data *promtmpl.Data) []AlertMsg {
msgs := []AlertMsg{}
if server.MsgOnce {
msg := server.FormatMsg(ircChannel, data)
msgs = append(msgs,
AlertMsg{Channel: ircChannel, Alert: msg})
} else {
for _, alert := range data.Alerts {
msg := server.FormatMsg(ircChannel, alert)
msgs = append(msgs,
AlertMsg{Channel: ircChannel, Alert: msg})
}
}
return msgs
}
func (server *HTTPServer) RelayAlert(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
ircChannel := "#" + vars["IRCChannel"]
@ -143,7 +106,7 @@ func (server *HTTPServer) RelayAlert(w http.ResponseWriter, r *http.Request) {
return
}
handledAlertGroups.WithLabelValues(ircChannel).Inc()
for _, alertMsg := range server.GetMsgsFromAlertMessage(
for _, alertMsg := range server.formatter.GetMsgsFromAlertMessage(
ircChannel, &alertMessage) {
select {
case server.AlertMsgs <- alertMsg:

View File

@ -116,39 +116,6 @@ func TestAlertsDispatched(t *testing.T) {
}
}
func TestAlertsDispatchedOnce(t *testing.T) {
listener := NewFakeHTTPListener()
testingConfig := MakeHTTPTestingConfig()
testingConfig.MsgOnce = true
testingConfig.MsgTemplate = "Alert {{ .GroupLabels.alertname }} is {{ .Status }}"
expectedAlertMsgs := []AlertMsg{
AlertMsg{
Channel: "#somechannel",
Alert: "Alert airDown is resolved",
},
}
expectedStatusCode := 200
response := RunHTTPTest(
t, testdataSimpleAlertJson, "/somechannel",
testingConfig, listener)
if expectedStatusCode != response.StatusCode {
t.Error(fmt.Sprintf("Expected %d status in response, got %d",
expectedStatusCode, response.StatusCode))
}
for _, expectedAlertMsg := range expectedAlertMsgs {
alertMsg := <-listener.AlertMsgs
if !reflect.DeepEqual(expectedAlertMsg, alertMsg) {
t.Error(fmt.Sprintf(
"Unexpected alert msg.\nExpected: %s\nActual: %s",
expectedAlertMsg, alertMsg))
}
}
}
func TestRootReturnsError(t *testing.T) {
listener := NewFakeHTTPListener()
testingConfig := MakeHTTPTestingConfig()
@ -180,39 +147,3 @@ func TestInvalidDataReturnsError(t *testing.T) {
expectedStatusCode, response.StatusCode))
}
}
func TestTemplateErrorsCreateRawAlertMsg(t *testing.T) {
listener := NewFakeHTTPListener()
testingConfig := MakeHTTPTestingConfig()
testingConfig.MsgTemplate = "Bogus template {{ nil }}"
expectedAlertMsgs := []AlertMsg{
AlertMsg{
Channel: "#somechannel",
Alert: `{"status":"resolved","labels":{"alertname":"airDown","instance":"instance1:3456","job":"air","service":"prometheus","severity":"ticket","zone":"global"},"annotations":{"DESCRIPTION":"service /prometheus has irc gateway down on instance1","SUMMARY":"service /prometheus air down on instance1"},"startsAt":"2017-05-15T13:49:37.834Z","endsAt":"2017-05-15T13:50:37.835Z","generatorURL":"https://prometheus.example.com/prometheus/...","fingerprint":"66214a361160fb6f"}`,
},
AlertMsg{
Channel: "#somechannel",
Alert: `{"status":"resolved","labels":{"alertname":"airDown","instance":"instance2:7890","job":"air","service":"prometheus","severity":"ticket","zone":"global"},"annotations":{"DESCRIPTION":"service /prometheus has irc gateway down on instance2","SUMMARY":"service /prometheus air down on instance2"},"startsAt":"2017-05-15T11:47:37.834Z","endsAt":"2017-05-15T11:48:37.834Z","generatorURL":"https://prometheus.example.com/prometheus/...","fingerprint":"25a874c99325d1ce"}`,
},
}
expectedStatusCode := 200
response := RunHTTPTest(
t, testdataSimpleAlertJson, "/somechannel",
testingConfig, listener)
if expectedStatusCode != response.StatusCode {
t.Error(fmt.Sprintf("Expected %d status in response, got %d",
expectedStatusCode, response.StatusCode))
}
for _, expectedAlertMsg := range expectedAlertMsgs {
alertMsg := <-listener.AlertMsgs
if !reflect.DeepEqual(expectedAlertMsg, alertMsg) {
t.Error(fmt.Sprintf(
"Unexpected alert msg.\nExpected: %s\nActual: %s",
expectedAlertMsg, alertMsg))
}
}
}