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Add a simple UI.
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‎cmd/jiralert/content.go

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package main
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import (
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"fmt"
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"html/template"
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"net/http"
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"github.com/free/jiralert"
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)
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const (
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docsUrl = "https://github.com/free/jiralert#readme"
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templates = `
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{{ define "page" -}}
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<html>
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<head>
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<title>JIRAlert</title>
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<style type="text/css">
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body { margin: 0; font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; font-size: 14px; line-height: 1.42857143; color: #333; background-color: #fff; }
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.navbar { display: flex; background-color: #222; margin: 0; border-width: 0 0 1px; border-style: solid; border-color: #080808; }
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.navbar > * { margin: 0; padding: 15px; }
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.navbar * { line-height: 20px; color: #9d9d9d; }
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.navbar a { text-decoration: none; }
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.navbar a:hover, .navbar a:focus { color: #fff; }
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.navbar-header { font-size: 18px; }
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body > * { margin: 15px; padding: 0; }
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pre { padding: 10px; font-size: 13px; background-color: #f5f5f5; border: 1px solid #ccc; }
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h1, h2 { font-weight: 500; }
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a { color: #337ab7; }
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a:hover, a:focus { color: #23527c; }
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</style>
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</head>
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<body>
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<div class="navbar">
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<div class="navbar-header"><a href="/">JIRAlert</a></div>
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<div><a href="/config">Configuration</a></div>
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<div><a href="/metrics">Metrics</a></div>
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<div><a href="/debug/pprof">Profiling</a></div>
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<div><a href="{{ .DocsUrl }}">Help</a></div>
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</div>
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{{template "content" .}}
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</body>
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</html>
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{{- end }}
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{{ define "content.home" -}}
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<p>This is <a href="{{ .DocsUrl }}">JIRAlert</a>, a
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<a href="https://prometheus.io/docs/alerting/configuration/#webhook_config">webhook receiver</a> for
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<a href="https://prometheus.io/docs/alerting/alertmanager/">Prometheus Alertmanager</a>.
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{{- end }}
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{{ define "content.config" -}}
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<h2>Configuration</h2>
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<pre>{{ .Config }}</pre>
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{{- end }}
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{{ define "content.error" -}}
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<h2>Error</h2>
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<pre>{{ .Err }}</pre>
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{{- end }}
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`
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)
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type tdata struct {
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DocsUrl string
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// `/config` only
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Config string
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// `/error` only
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Err error
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}
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var (
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allTemplates = template.Must(template.New("").Parse(templates))
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homeTemplate = pageTemplate("home")
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configTemplate = pageTemplate("config")
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errorTemplate = pageTemplate("error")
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)
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func pageTemplate(name string) *template.Template {
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pageTemplate := fmt.Sprintf(`{{define "content"}}{{template "content.%s" .}}{{end}}{{template "page" .}}`, name)
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return template.Must(template.Must(allTemplates.Clone()).Parse(pageTemplate))
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}
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// HomeHandlerFunc is the HTTP handler for the home page (`/`).
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func HomeHandlerFunc() func(http.ResponseWriter, *http.Request) {
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return func(w http.ResponseWriter, r *http.Request) {
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homeTemplate.Execute(w, &tdata{
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DocsUrl: docsUrl,
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})
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}
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}
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// ConfigHandlerFunc is the HTTP handler for the `/config` page. It outputs the configuration marshaled in YAML format.
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func ConfigHandlerFunc(config *jiralert.Config) func(http.ResponseWriter, *http.Request) {
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return func(w http.ResponseWriter, r *http.Request) {
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configTemplate.Execute(w, &tdata{
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DocsUrl: docsUrl,
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Config: config.String(),
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})
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}
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}
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// HandleError is an error handler that other handlers defer to in case of error. It is important to not have written
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// anything to w before calling HandleError(), or the 500 status code won't be set (and the content might be mixed up).
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func HandleError(err error, metricsPath string, w http.ResponseWriter, r *http.Request) {
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w.WriteHeader(http.StatusInternalServerError)
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errorTemplate.Execute(w, &tdata{
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DocsUrl: docsUrl,
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Err: err,
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})
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}

‎cmd/jiralert/main.go

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requestTotal.WithLabelValues(conf.Name, "200").Inc()
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})
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http.HandleFunc("/", HomeHandlerFunc())
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http.HandleFunc("/config", ConfigHandlerFunc(config))
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http.HandleFunc("/healthz", func(w http.ResponseWriter, r *http.Request) { http.Error(w, "OK", http.StatusOK) })
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http.Handle("/metrics", promhttp.Handler())
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if os.Getenv("PORT") != "" {

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