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warmup.js
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warmup.js
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/* Periodiacly query the main service to keep in running chrome in the background.
* We need this, because our boot time exceeds 30 seconds, given by heroku to craft a response
*
* This script looks like a periodic healthcheck, which it is. But we can't use docker HEALTHCHECK cmd,
* because heroku does not support it.
*/
const axios = require("axios");
const {
ToadScheduler,
SimpleIntervalJob,
AsyncTask,
} = require("toad-scheduler");
const port = process.env.PORT || 3000;
const query = () =>
axios.request({
url: `http://localhost:${port}/warmup.png`,
params: {
name: "Konstantin Konstantinopolisky",
sex: "m",
},
headers: {
Authorization: `Bearer ${process.env.SECRET_TOKEN}`,
},
});
setTimeout(() => {
console.log("Running initial warmup...");
query()
.then(() => console.log("Done!"))
.catch(() => console.error("Error!"));
}, 3000);
console.log("Running scheduler...");
const scheduler = new ToadScheduler();
scheduler.addSimpleIntervalJob(
new SimpleIntervalJob(
{ seconds: 60 },
new AsyncTask("Periodiacly query the main service", query)
)
);