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web.js
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web.js
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import crypto from 'crypto'
import http from 'http'
import express from 'express'
import pino from 'pino'
import pinoHttp from 'pino-http'
import { collectDefaultMetrics, register } from 'prom-client'
const app = express()
//
// Utilties
//
// Wrap an async function so we can use it with express.
function expressify(fn) {
return (req, res, next) => {
fn(req, res, next).catch(next)
}
}
//
// Logging
//
let pinoOptions
if (process.env.NODE_ENV === 'production')
pinoOptions = {
transport: {
target: 'pino-google-cloud-format-transport',
},
}
const logger = pino(pinoOptions)
app.use(
pinoHttp({
logger,
quietReqLogger: true,
})
)
//
// Health Checks
//
app.get('/livez', (req, res) => {
res.sendStatus(200)
})
const CLSI_HOST = process.env.CLSI_SERVICE_HOST || 'localhost'
const CLSI_PORT = parseInt(process.env.CLSI_SERVICE_PORT || 8081, 10)
app.get(
'/readyz',
expressify(async (req, res) => {
try {
const url = new URL(`http://${CLSI_HOST}:${CLSI_PORT}/readyz`)
const response = await fetch(url, {
signal: AbortSignal.timeout(5000),
})
if (response.ok) {
res.sendStatus(200)
} else {
res.sendStatus(503)
}
} catch (err) {
res.sendStatus(500)
}
})
)
//
// Prometheus Metrics
//
collectDefaultMetrics()
app.get(
'/metrics',
expressify(async (req, res) => {
res.set('Content-Type', register.contentType)
const metrics = await register.metrics()
res.end(metrics)
})
)
//
// Server Setup
//
const server = http.createServer(app)
const port = parseInt(process.env.PORT || 8080, 10)
server.listen(port, () => {
logger.info({ port }, 'up')
})
process.on('SIGTERM', () => {
server.close()
})
//
// Application Code
//
app.use(express.json())
app.get('/', (req, res) => {
res.send(`
<html>
<head>
<title>Compiler Demo</title>
<script>
let inFlight = 0
async function compile() {
++inFlight
const url = new URL('/compile', window.location.origin)
try {
const response = await fetchJson(url, {
method: 'POST',
signal: AbortSignal.timeout(20000)
})
if (response.ok) {
const body = await response.json()
logResult('Success! ' + JSON.stringify(body))
} else {
logResult('request failed with status ' + response.status)
}
} catch (err) {
if (err.name === 'AbortError') {
logResult('request was aborted (probably took >20s and timed out)')
} else {
logResult(err.name + ': ' + err.message)
}
} finally {
--inFlight
}
}
let demandTestMs = 5000
let demandTestInterval = null
function toggleDemandTest() {
if (demandTestInterval) {
clearTimeout(demandTestInterval)
demandTestInterval = null
document.querySelector('#demand-test').textContent = 'Generate Compiles'
return
}
compile().catch(alert)
demandTestInterval = setInterval(
() => compile().catch(alert),
demandTestMs
)
document.querySelector('#demand-test').textContent = 'Stop Generating Compiles'
}
function logResult(result) {
const resultElement = document.createElement('p')
if (inFlight > 0) result += ' (' + inFlight + ' requests were in flight)'
resultElement.textContent = result
document.querySelector('#output').append(resultElement)
}
async function fetchJson(url, options = {}) {
options.headers = {
Accept: 'application/json',
'Content-Type': 'application/json',
...options.headers,
}
const response = await fetch(url, options)
return response
}
</script>
</head>
<body>
<h1>Compiler Demo</h1>
<p><button onclick="compile().catch(alert)">Run a Simulated Compile</button></p>
<p><button id="demand-test" onclick="toggleDemandTest()">Generate Compiles</button> (1 compile every 5s)</p>
<h2>Output</h2>
<pre id="output"></pre>
</body>
</html>
`)
})
const DOC_LENGTH = parseInt(process.env.DOC_LENGTH || 1000, 10)
app.post(
'/compile',
expressify(async (req, res) => {
const docLength = 1 + DOC_LENGTH * Math.random()
const result = await requestCompile(docLength)
res.send(result)
})
)
async function requestCompile(docLength) {
const compileId = crypto.randomUUID().slice(0, 8)
docLength = Math.floor(docLength)
logger.info({ compileId, docLength }, 'starting compile request')
const body = {
doc: compileId + 'x'.repeat(docLength),
compiler: 'pdftex',
}
const url = new URL(`http://${CLSI_HOST}:${CLSI_PORT}/compile`)
const response = await fetchJson(url, {
method: 'POST',
body: JSON.stringify(body),
})
if (response.ok) {
const result = await response.json()
logger.info({ compileId, ...result }, 'compile succeeded')
return result
} else {
throw new Error(`compile failed: status ${response.status}`)
}
}
async function fetchJson(url, options = {}) {
options.headers = {
Accept: 'application/json',
'Content-Type': 'application/json',
...options.headers,
}
const response = await fetch(url, options)
return response
}