功能Heroku部署的Twitter机器人剧照显示应用程序错误？

Question

我在Heroku上部署了一个功能正常的Twitter机器人（@Sunlight_Bot），但仍显示此错误：

日志显示错误H14，我认为这只是因为当我的机器人在帖子之间等待（setInterval）时dyno被关闭，这是正确的吗？

2019-04-23T22:26:16.989176+00:00 app[api]: Release v81 created by user <user>
2019-04-23T22:26:16.989176+00:00 app[api]: Deploy ... by user <user>
2019-04-23T22:26:17.000000+00:00 app[api]: Build succeeded
2019-04-23T22:26:18.042459+00:00 heroku[worker.1]: Stopping all processes with SIGTERM
2019-04-23T22:26:18.104139+00:00 heroku[worker.1]: Process exited with status 143
2019-04-23T22:26:19.664782+00:00 heroku[worker.1]: Starting process with command `node app.js`
2019-04-23T22:26:20.333252+00:00 heroku[worker.1]: State changed from starting to up
2019-04-23T22:27:53.987454+00:00 heroku[router]: at=error code=H14 desc="No web processes running" method=GET path="/" host=<host> request_id=<id> fwd="<fwd>" dyno= connect= service= status=503 bytes= protocol=https
2019-04-23T22:27:54.206902+00:00 heroku[router]: at=error code=H14 desc="No web processes running" method=GET path="/favicon.ico" host=<host> request_id=<id> fwd="<fwd>" dyno= connect= service= status=503 bytes= protocol=https

为什么Heroku仍然显示此应用程序错误，尽管机器人功能正常？这是我可以/应该解决的问题吗？

这是代码。 setInterval每六个小时调用一次tweeter()函数。该函数从Heroku PostgreSQL数据库中获取一些数据，对其进行格式化，并将其作为一个或多个推文发布到Twitter。

function tweeter() {

    stafferInfo = {};
    tweetString = '';

    let pool = new pg.Pool({
        connectionString: process.env.DATABASE_URL,
        ssl: true
    } || config.db);

    pool.connect()

        .then(client => {
            pgClient = client;
            return pgClient.query(randomRow)
                .then(res => {
                    stafferInfo = res.rows[0];   // (1) GET INFO FROM DB AND SET VARIABLE
                    // console.log(stafferInfo);

                })
                .catch(err => console.error('Error executing first psql query', err.stack));
        })

        .then(() => {
            return pgClient.query(updateTweeted) // (2) UPDATE "TWEETED" COUNT
                .then(res => {
                    // console.log(res);
                })
                .catch(err => console.error('Error executing second psql query', err.stack));
        })
        .then(() => {                     // (3) POST TWEET
            tweetString = formatTweet(stafferInfo);

            if ((`${tweetString} (data from ProPublica's Trump Town dataset)`).length <= (280)) {
                tweetString += ` (data from ProPublica's Trump Town dataset)`
            }
            else if (tweetString.length <= 280) {

                console.log(tweetString);

                sendTweet(tweetString);

                if (stafferInfo.linkedin_url) {
                    console.log(formatLinkedIn(stafferInfo));
                    sendTweet(formatLinkedIn(stafferInfo));
                }
                if (stafferInfo.resume_document_url) {
                    console.log(formatResume(stafferInfo));
                    sendTweet(formatResume(stafferInfo));
                }
                if (stafferInfo.financial_disclosure_url) {
                    console.log(formatFinancialDisclosure(stafferInfo));
                    sendTweet(formatFinancialDisclosure(stafferInfo));
                }
                if (stafferInfo.ethics_waiver_url) {
                    console.log(formatEthicsWaiver(stafferInfo));
                    sendTweet(formatEthicsWaiver(stafferInfo));
                }
            }
            else {
                console.log(`Tweet is longer than 280 characters: ${tweetString}`);
            }
        })
        .catch(err => {
            console.error('Error acquiring client: ', err.stack);  // IF ERROR THROW TO CONSOLE
        })
        .finally(() => {                                // EITHER WAY SHUT DOWN CLIENT & POOL AFTER
            if (pgClient) {
                pgClient.release();
            }
            pool.end(); // pool shutdown
        });
}

// tweeter(); // For testing

setInterval(tweeter, 6*60*60*1000);

Answer 1

您的机器人无法启动HTTP服务器，因此您不应期望它响应请求。

如果您希望机器人响应HTTP请求，您可以安装express，并让它以某种状态响应。首先安装express

npm install express

然后添加到您的机器人：

const express = require('express');
const app = express();
const port = 3000;
let tweet_count = 0;

// Insert your bot here
// And modify it to increment `tweet_count` when it sends a msg

app.get('/', (req, res) => res.send(`Twitter bot is up and running! Tweets sent: ${tweet_count}`));

app.listen(port, () => console.log(`Twitter bot http server listening on port ${port}!`));