GASによるサーバーの死活監視Slackボット

gas_slack_bot.gs

function isServerAlive() {
  var serverUrl = PropertiesService.getScriptProperties().getProperty('SERVER_URL');
  var options = { 
    muteHttpExceptions: true,
  };
  var res = UrlFetchApp.fetch(serverUrl, options);
  return res.getResponseCode() == 200;
}

function postMessage(msg) {
  var methodUrl = 'https://slack.com/api/chat.postMessage';
  var token = PropertiesService.getScriptProperties().getProperty('SLACK_API_TOKEN');
  var channel = PropertiesService.getScriptProperties().getProperty('SLACK_CHANNEL');
  var headers = {
    Authorization: 'Bearer ' + token,
  }
  var data = {
    channel: channel,
    text: msg,
    as_user: true,
  };
  var options = {
    method: 'post',
    headers: headers,
    contentType: 'application/json',
    payload: JSON.stringify(data),
  };
  var res = UrlFetchApp.fetch(methodUrl, options);
  Logger.log(res.getContentText());
}

function main() {
  if(!isServerAlive()) {
    postMessage('<@U7Y6FLENM> sayakachan.net がダウンしてるよ！');
  }
}