[enh] add BMA watcher + reorganize code

src/lib/mail.ts

@@ -0,0 +1,69 @@
+import {moment} from "duniter/app/lib/common-libs/moment";
+import {Conf} from "./types/conf";
+import {ConfMail} from './types/conf'
+import * as nodemailer from 'nodemailer'
+
+export async function sendMail(conf: ConfMail, subject: string, html: string) {
+
+  if (conf.enabled) {
+    let transporter = nodemailer.createTransport({
+      host: conf.host,
+      port: conf.port,
+      secure: false, // true for 465, false for other ports
+      auth: {
+        user: conf.username, // generated ethereal user
+        pass: conf.apikey // generated ethereal password
+      },
+      authMethod: conf.auth,
+      requireTLS: true,
+    });
+
+// send mail with defined transport object
+    let info = await transporter.sendMail({
+      from: conf.from,
+      to: conf.to,
+      subject,
+      html
+    })
+  }
+}
+
+export const mail = {
+
+  onEstablished: (conf: Conf, target: string) => {
+    return async () => {
+      console.log('Connection established')
+      await sendMail(conf.mail, '[dwatcher] Connection established', `
+      <p>
+        Connection to ${target} established on ${moment().format('DD-MM-YYYY HH:mm:ss')}.
+      </p>
+    `)
+    }
+  },
+
+  onDisconnect: (conf: Conf, target: string) => {
+    return async (waitingDelay: number) => {
+      console.log('Connection closed')
+      console.log('Waiting %s seconds...', waitingDelay)
+      await sendMail(conf.mail, '[dwatcher] Connection closed', `
+      <p>
+        Connection to ${target} was lost on ${moment().format('dd-MM-YYYY HH:mm:ss')}.
+      </p>
+      <p>
+        Waiting ${(waitingDelay / 1000).toFixed(0)} seconds before trying to reconnect.
+      </p>
+  `)
+    }
+  },
+
+  onRestartSuccess: (conf: Conf, target: string) => {
+    return async () => {
+      console.log('Connection recovered')
+      await sendMail(conf.mail, '[dwatcher] Connection recovered', `
+      <p>
+        Connection to ${target} was lost on ${moment().format('dd-MM-YYYY HH:mm:ss')}.
+      </p>
+    `)
+    }
+  }
+}