Send HTML Message

* Don't send message if it's empty

core/matrix.go

@@ -5,6 +5,7 @@ import (
 	"strings"
 
 	m "maunium.net/go/mautrix"
+	"maunium.net/go/mautrix/event"
 	. "maunium.net/go/mautrix/id"
 )
 
@@ -46,8 +47,8 @@ func NewMatrixClient(config MatrixConfig) (*MatrixClient, error) {
 	}
 
 	return &MatrixClient{
-		inner: *client,
-		config: config,
+		inner:   *client,
+		config:  config,
 		room_id: opaque_room_id,
 	}, nil
 }
@@ -56,6 +57,16 @@ func (client *MatrixClient) SendNotice(message string) (*m.RespSendEvent, error)
 	return client.inner.SendNotice(client.room_id, message)
 }
 
+func (client *MatrixClient) SendNoticeHTML(plain string, html string) (*m.RespSendEvent, error) {
+	return client.inner.SendMessageEvent(client.room_id, event.EventMessage,
+		&event.MessageEventContent{
+			MsgType:       event.MsgNotice,
+			Body:          plain,
+			Format:        "org.matrix.custom.html",
+			FormattedBody: html,
+		})
+}
+
 func (client *MatrixClient) RedactEvent(eventId EventID, reason string) (*m.RespSendEvent, error) {
 	return client.inner.RedactEvent(client.room_id, eventId, m.ReqRedact{Reason: reason})
 }

main.go

@@ -10,6 +10,7 @@ import (
 	"net/http"
 	"os"
 	os_signal "os/signal"
+	"strings"
 	"syscall"
 	"time"
 
@@ -223,7 +224,10 @@ func routineCheck(timeout time.Duration, doNotify bool) error {
 }
 
 func notify(updates []scanner.ServiceStatus) error {
-	message := "```\n"
+	if len(updates) == 0 {
+		return nil
+	}
+	messageBody := ""
 	for _, v := range updates {
 		var upOrDown string
 		if v.Ok {
@@ -232,10 +236,11 @@ func notify(updates []scanner.ServiceStatus) error {
 			upOrDown = "DOWN"
 		}
 		serviceType := fmt.Sprintf("[%s]", v.Type)
-		message += fmt.Sprintf("%-4s | %-24s %-7s  %s\n", upOrDown, v.Name, serviceType, v.Status)
+		messageBody += fmt.Sprintf("%-4s | %-24s %-7s  %s\n", upOrDown, v.Name, serviceType, v.Status)
 	}
-	message += "```\n"
-	_, err := client.SendNotice(message)
+	_, err := client.SendNoticeHTML(
+		"```\n"+messageBody+"```",
+		"<pre><code>"+strings.TrimRight(messageBody, "\n")+"</code></pre>")
 	log.Printf("notify: err=%v\n%v", err, updates)
 	return err
 }