[英]Issue with node.js app stopping on AWS
我有一个ping.js应用程序ping一个网址,然后如果它得到一个错误代码,发送一条消息给Slack。 它工作正常两天,但它只是停止工作。 我正在使用Screen来保持运行但它似乎仍然停止。 任何帮助将不胜感激。
代码如下:
var request = require("request")
var Hapi = require('hapi');
var Slack = require('slack-node');
var h = 0;
var s = 0;
var e = 0;
function onlineBooking(){
request({
url: "http://example.com",
json: true
}, function (error, response, body) {
if (!error && response.statusCode === 200) {
// 'if/else' checks that it receives an up respsose four times in a row
// the variable e is increased by .25 for every 200(ok response) until e reaches 1
// it will then send a message that the server is up
if(e < 1 && response.statusCode === 200){
setTimeout(function () {
console.log(response.statusCode) // Print the response code
e =e+0.25;
}, 6000); // 6 seconds delay between each response
}
else {
while(h == 0){
console.log(response.statusCode) // Print the response code
console.log("********************")
slackReviewBot("Website :robot_face: ", response.statusCode + " - OK", "http://example.com", "");
h++;
s = 0;
}
}// end of else
}// end of if
else {
console.log(response.statusCode) // Print the response code
e = 0;
setTimeout(function () {
while(s == 0){
console.log(response.statusCode) // Print the response code
console.log("********************")
slackReviewBot("Website :robot_face: ", response.statusCode, "http://example.com", "");
s++;
h=0;
}}, 3000);
} // end of else
})
}
// sets the loop for checking every 7 seconds
setInterval(function(){
onlineBooking();
}, 7000);
// this function sends server name, a message and url to slack
function slackReviewBot(servername, body, urls, bod) {
var time = require('time');
// Create a new Date instance
var now = new time.Date();
now.setTimezone("Europe/London");
var bo = body;
var bod = bod;
var urls = urls;
var sname = servername;
// you'll need to replace the slack webhook below
// you'll find info on webhooks here https://api.slack.com/incoming-webhooks
var webhook_url = 'https://hooks.slack.com/services/xxxxxxxxxxxxxxxxxxxxxx';
slack = new Slack();
slack.setWebhook(webhook_url);
slack.webhook({
channel: "#server-uptime",
username: "Server:",
icon_emoji: "http://4.bp.blogspot.com/-mYCTaPOu-60/VK98X5CJEyI/AAAAAAAAApM/0oplbclvnUY/s1600/unnamed.png",
text: " " + "\n" +
"*" + sname + " * " + "\n" +
"Status: " + bo + "\n" +
now + "\n" +
"Check the status here: " + urls + "\n"
}, function(err, response) {
console.log(response);
});
}
// below is so you can send a test json object to the server
// http POST localhost:1337/jsonpost test=Test
// you'll get a slack message letting you know the server is running
var server = new Hapi.Server();
server.connection({
port: 1337
});
exports.add = function(i, j) {
return i + j;
};
// Slack function for sending the test reply
function slackReviewBot2(testserver) {
testserver = testserver;
// you'll need to replace the slack webhook below
// you'll find info on webhooks here https://api.slack.com/incoming-webhooks
var webhook_url = 'https://hooks.slack.com/services/xxxxxxxxxxxxxxxxxxxxxxxxxx';
slack2 = new Slack();
slack2.setWebhook(webhook_url);
slack.webhook({
channel: "#server-uptime",
username: "Server-Test-Reply:",
icon_emoji: "http://www.wonderfulwebsites.ie/logo.png",
text: ":star: :star: :star: :star: :star:" + "\n" +
"\n" +
"Sever is up and running!!!"
}, function(err, response) {
console.log(response);
});
}
// take the json object for testing
server.route({
method: 'POST'
, path: '/jsonpost',
handler: function(req, reply) {
var review = {
userName: req.payload.userName
}
//passes the review to the slackbot function
slackReviewBot2(review.userName);
reply("Received");
}
});
// prints a server running message
server.start(function(){
console.log('server running at: ', server.info.url);
});
您可以在http://codingyoda.com/slack-pinging-tool.php下找到解释其工作原理的帖子
我不知道为什么会发生这种情况,但你可以永远修复它,如果变为非活动状态或崩溃(这将取代屏幕),它将重新启动进程。
日志肯定会帮助我们找到根本原因 - 请检查您的日志并在此处发布。 正如其他答案所暗示的那样 - 任何生产环境我建议永远使用或PM2重新启动你的应用程序,如果它死了。 正如@sebastian建议的那样,如果不是原因可能会解决问题 - 通过自动重启你的应用程序。 另一个好处是,这些应用程序会将您的控制台消息记录到文件中 - 这将使您(和我们)更好地了解正在发生的事情。
还有一个想法:你可能正在处理未被捕获的异常。 如果您认为这种情况正在发生,您可以添加一些代码来捕获,报告甚至优雅地关闭。 George Ornbo在这里写了一篇很棒的文章,我建议你在考虑如何处理这些异常时阅读。
这是一个过于简化的代码示例,用于捕获应捕获错误的未捕获异常,更重要的是,您需要跟踪问题源自的堆栈跟踪(假设您捕获这些日志):
//catches uncaught exceptions
process.on('uncaughtException', function (err) {
console.trace("Uncaught Exception", err);
gracefulShutdown(err);
});
// implementation beyond the scope of this question.
function gracefulShutdown(error) {
process.exit(error);
}
我希望有所帮助!
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