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email-notifier.go
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email-notifier.go
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package notifier
import (
"fmt"
"net/smtp"
log "github.com/Sirupsen/logrus"
"strings"
)
var sendMail = smtp.SendMail
type EmailNotifier struct {
ClusterName string `json:"cluster-name"`
Enabled bool
Template string `json:"template"`
Url string `json:"url"`
Port int `json:"port"`
Username string `json:"username"`
Password string `json:"password"`
SenderAlias string `json:"sender-alias"`
SenderEmail string `json:"sender-email"`
Receivers []string `json:"receivers"`
OnePerAlert bool `json:"one-per-alert"`
OnePerNode bool `json:"one-per-node"`
}
// NotifierName provides name for notifier selection
func (emailNotifier *EmailNotifier) NotifierName() string {
return "email"
}
func (emailNotifier *EmailNotifier) Copy() Notifier {
notifier := *emailNotifier
return ¬ifier
}
//Notify sends messages to the endpoint notifier
func (emailNotifier *EmailNotifier) Notify(alerts Messages) bool {
overAllStatus, pass, warn, fail := alerts.Summary()
nodeMap := mapByNodes(alerts)
var emailDataList []TemplateData
if emailNotifier.OnePerAlert {
log.Println("Going to send one email per alert")
emailDataList = []TemplateData{}
for _, check := range alerts {
singleAlertChecks := make(Messages, 0)
singleAlertChecks = append(singleAlertChecks, check)
singleAlertMap := mapByNodes(singleAlertChecks)
alertStatus, alertPassing, alertWarnings, alertFailures := singleAlertChecks.Summary()
alertClusterName := emailNotifier.ClusterName + " " + check.Node + " - " + check.CheckId
e := TemplateData{
ClusterName: alertClusterName,
SystemStatus: alertStatus,
FailCount: alertFailures,
WarnCount: alertWarnings,
PassCount: alertPassing,
Nodes: singleAlertMap,
}
emailDataList = append(emailDataList, e)
}
} else if emailNotifier.OnePerNode {
log.Println("Going to send one email per node")
emailDataList = []TemplateData{}
for nodeName, checks := range nodeMap {
singleNodeMap := mapByNodes(checks)
nodeStatus, nodePassing, nodeWarnings, nodeFailures := checks.Summary()
nodeClusterName := emailNotifier.ClusterName + " " + nodeName
e := TemplateData{
ClusterName: nodeClusterName,
SystemStatus: nodeStatus,
FailCount: nodeFailures,
WarnCount: nodeWarnings,
PassCount: nodePassing,
Nodes: singleNodeMap,
}
emailDataList = append(emailDataList, e)
}
} else {
log.Println("Going to send one email for many alerts")
e := TemplateData{
ClusterName: emailNotifier.ClusterName,
SystemStatus: overAllStatus,
FailCount: fail,
WarnCount: warn,
PassCount: pass,
Nodes: nodeMap,
}
emailDataList = []TemplateData{e}
}
success := true
for _, e := range emailDataList {
var renderedTemplate string
var err error
renderedTemplate, err = renderTemplate(e, emailNotifier.Template, defaultTemplate)
if err != nil {
log.Println("Template error, unable to send email notification: ", err)
success = false
continue
}
msg := fmt.Sprintf(`From: "%s" <%s>
To: %s
Subject: %s is %s
MIME-version: 1.0;
Content-Type: text/html; charset="UTF-8";
%s
`,
emailNotifier.SenderAlias,
emailNotifier.SenderEmail,
strings.Join(emailNotifier.Receivers, ", "),
e.ClusterName,
e.SystemStatus,
renderedTemplate)
addr := fmt.Sprintf("%s:%d", emailNotifier.Url, emailNotifier.Port)
auth := smtp.PlainAuth("", emailNotifier.Username, emailNotifier.Password, emailNotifier.Url)
if err := sendMail(addr, auth, emailNotifier.SenderEmail, emailNotifier.Receivers, []byte(msg)); err != nil {
log.Println("Unable to send notification:", err)
continue
}
log.Println("Email notification sent.")
success = success && true
}
return success
}
func mapByNodes(alerts Messages) map[string]Messages {
nodeMap := make(map[string]Messages)
for _, alert := range alerts {
nodeName := alert.Node
nodeChecks := nodeMap[nodeName]
if nodeChecks == nil {
nodeChecks = make(Messages, 0)
}
nodeChecks = append(nodeChecks, alert)
nodeMap[nodeName] = nodeChecks
}
return nodeMap
}
var defaultTemplate string = `
<!DOCTYPE html>
<html lang="en">
<head>
<title>{{ .ClusterName }}</title>
</head>
<body style="width:100% !important; min-width: 100%; -webkit-text-size-adjust:100%; -ms-text-size-adjust:100%; margin:0; padding:0; font-family: 'Helvetica', 'Arial', sans-serif; color: #000000;">
<div style="margin-left: auto; margin-right: auto; width: 36em; padding: 10dp; font-weight: bold; color: #ffffff; background-color: {{ if .IsCritical }}#e13329{{ else if .IsWarning }}#eebb00{{ else if .IsPassing }}#24c75a{{ end }};">
<div style="padding: 10px;">
{{ .ClusterName }}
</div>
</div>
<div style="margin-left: auto; margin-right: auto; width: 36em; margin-top: 10px; margin-bottom: 10px; padding: 10dp">
<p>
<span style="font-weight: bold; font-size: 1.05em;">System is {{ .SystemStatus }}</span>
<br/>
<span style="font-size: 0.9em;">The following nodes are currently experiencing issues:</span>
<div style="font-size: 0.85em;">
<div style="float: left; width: 33%;">
<strong>Failed: </strong>
<span>{{ .FailCount }}</span>
</div>
<div style="float: right; width: 33%;">
<strong>Warning: </strong>
<span>{{ .WarnCount }}</span>
</div>
<div style="display: inline-block; width: 33%;">
<strong>Passed: </strong>
<span>{{ .PassCount }}</span>
</div>
</div>
</p>
</div>
{{ range $name, $checks := .Nodes }}
<div style="margin-left: auto; margin-right: auto; width: 36em; padding-top: 5px; padding-bottom: 20px;">
<div style="font-size: 1.1em;">
<strong>Node: </strong>
<strong>{{ $name }}</strong>
</div>
{{ range $check := $checks }}
<div style="margin-top: 15px; padding: 10px; background-color: {{ if $check.IsCritical }}#e13329{{ else if $check.IsWarning }}#eebb00{{ else if $check.IsPassing }}#24c75a{{ end }};">
<div style="font-weight: bold; font-size: 1.1em;">
{{ with $check.Service }}
{{ $check.Service }}:
{{ end }}
{{ $check.Check }}
</div>
<div style="font-size: 0.85em;">
<strong>Since: </strong>
<span>{{ $check.Timestamp }}</span>
</div>
{{ with $check.Notes }}
<div style="padding-top: 15px;">
<strong>Notes: </strong>
<pre>{{ $check.Notes }}</pre>
</div>
{{end }}
<div style="padding-top: 15px;">
<strong>Output:</strong>
<pre>{{ $check.Output }}</pre>
</div>
</div>
{{ end }}
</div>
{{ end }}
</body>
</html>
`