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format_message.go
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/
format_message.go
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package main
import (
"encoding/json"
"fmt"
"github.com/kelseyhightower/envconfig"
"log"
"os"
"sort"
s "strings"
"time"
)
const (
// emoji formatting
emojiCrossMark = "\xE2\x9D\x8C"
emojiWarningsSign = "\xE2\x9A\xA0\xEF\xB8\x8F"
// PagerDuty Events API v2 const
layoutISO = "02.01.2006 15:04:05 MST"
eventAction = "trigger"
client = "OEM Monitoring"
)
// Oracle OEM metric variables from:
// https://docs.oracle.com/cd/E73210_01/EMADM/GUID-B48F6A84-EE89-498D-94E0-5DE1E7A0CFBC.htm#EMADM9066
type oemEnv struct {
Severity string `envconfig:"SEVERITY"`
HostName string `envconfig:"HOST_NAME"`
TargetType string `envconfig:"TARGET_TYPE"`
TargetName string `envconfig:"TARGET_NAME"`
Message string `envconfig:"MESSAGE"`
Metric string `envconfig:"METRIC_COLUMN"`
MetricValue string `envconfig:"VALUE"`
IncidentCreationTime string `envconfig:"INCIDENT_CREATION_TIME"`
EventReportedTime string `envconfig:"EVENT_REPORTED_TIME"`
JobName string `envconfig:"SOURCE_OBJ_NAME"`
JoOwner string `envconfig:"SOURCE_OBJ_OWNER"`
JoType string `envconfig:"SOURCE_OBJ_SUB_TYPE"`
JobStatus string `envconfig:"EXECUTION_STATUS"`
JobError string `envconfig:"JOB_ERROR"`
}
// PagerDuty Events API v2 structure:
// https://developer.pagerduty.com/docs/events-api-v2/trigger-events/
type pagerDuty struct {
Payload struct {
Summary string `json:"summary"`
Timestamp time.Time `json:"timestamp,omitempty"`
Source string `json:"source"`
Severity string `json:"severity"`
Component string `json:"component,omitempty"`
Group string `json:"group,omitempty"`
Class string `json:"class,omitempty"`
CustomDetails oemEnv `json:"custom_details,omitempty"`
} `json:"payload"`
RoutingKey string `json:"routing_key"`
Images *pagerDutyImages `json:"images,omitempty"`
Links *pagerDutyLinks `json:"links,omitempty"`
EventAction string `json:"event_action"`
Client string `json:"client,omitempty"`
ClientUrl string `json:"client_url,omitempty"`
}
type pagerDutyImages struct {
Src string `json:"src"`
Href string `json:"href"`
Alt string `json:"alt"`
}
type pagerDutyLinks struct {
Href string `json:"href"`
Text string `json:"text"`
}
func MessageIsCritical() (critical bool) {
cfg, err := ProcessConfigParameters(confFile)
if err != nil {
log.Fatal("Unable to ProcessConfigParameters ", err)
}
for i := range cfg.PagerDuty.VoiceCallAlertWildcard {
if s.Contains(os.Getenv("MESSAGE"), cfg.PagerDuty.VoiceCallAlertWildcard[i]) {
return true
}
}
return false
}
func FormatPagerDutyMessage(oemDataMap map[string]string) (pagerDutyMsg *pagerDuty, err error) {
cfg, err := ProcessConfigParameters(confFile)
if err != nil {
log.Fatal("Unable to ProcessConfigParameters ", err)
}
// get OEM message map
oemDataMap, err = processOemEnvVariables()
if err != nil {
log.Fatal("Unable to processOemEnvVariables ", err)
}
// convert map to json
oemDataJson, _ := json.Marshal(oemDataMap)
// convert json to struct
oemMsg := oemEnv{}
if err := json.Unmarshal(oemDataJson, &oemMsg); err != nil {
log.Fatal("Unable to unmarshal oemDataJson ", err)
}
pagerDutyMsg = &pagerDuty{}
data, _ := json.Marshal(pagerDutyMsg)
err = json.Unmarshal(data, &pagerDutyMsg)
// oem fields to pagerDuty fields mapping
for key := range oemDataMap {
switch key {
case "HostName":
pagerDutyMsg.Payload.Source = oemMsg.HostName
case "Severity":
pagerDutyMsg.Payload.Severity = s.ToLower(oemMsg.Severity)
case "EventReportedTime":
timestamp, _ := time.Parse(layoutISO, oemMsg.EventReportedTime)
pagerDutyMsg.Payload.Timestamp = timestamp
case "Message":
pagerDutyMsg.Payload.CustomDetails.Message = oemMsg.Message
case "Metric":
pagerDutyMsg.Payload.Class = oemMsg.Metric
case "MetricValue":
pagerDutyMsg.Payload.CustomDetails.MetricValue = oemMsg.MetricValue
case "TargetType":
pagerDutyMsg.Payload.Group = oemMsg.TargetType
case "TargetName":
pagerDutyMsg.Payload.Component = oemMsg.TargetName
}
}
pagerDutyMsg.Payload.Summary = oemMsg.Severity + " alert on " + oemMsg.HostName
pagerDutyMsg.RoutingKey = cfg.PagerDuty.RoutingKey
pagerDutyMsg.EventAction = eventAction
pagerDutyMsg.Client = client
pagerDutyMsg.ClientUrl = cfg.PagerDuty.ClientUrl
return pagerDutyMsg, err
}
func processOemEnvVariables() (result map[string]string, err error) {
oemMsg := &oemEnv{}
err = envconfig.Process("", oemMsg)
if err != nil {
log.Fatal(err)
}
message, err := json.Marshal(oemMsg)
if err != nil {
log.Fatal("Unable to marshal oemMsg: ", err)
}
var oemMsgMap map[string]string
err = json.Unmarshal(message, &oemMsgMap)
return oemMsgMap, err
}
func FormatTelegramMessage() (result string, err error) {
// emoji formatting
switch os.Getenv("SEVERITY") {
case "Critical":
os.Setenv("SEVERITY", emojiCrossMark+"Critical")
case "Warning":
os.Setenv("SEVERITY", emojiWarningsSign+"Warning")
}
// unmarshal OemEnv struct to alertMsg map
var alertMsg map[string]string
alertMsg, err = processOemEnvVariables()
if err != nil {
log.Fatal("Unable to processOemEnvVariables ", err)
}
// we need to sort keys for order iteration over map
keys := make([]string, 0)
for k := range alertMsg {
keys = append(keys, k)
}
sort.Strings(keys)
for _, k := range keys {
// filter out all empty values
if len(alertMsg[k]) > 0 {
// Convert each key/value pair to string adding html bold tags
result += fmt.Sprintf("<b>%s</b> : %s \n", k, alertMsg[k])
}
}
return result, err
}