overleaf/libraries/metrics/http.js

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const Metrics = require('./index')
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module.exports.monitor = logger =>
function(req, res, next) {
const startTime = Date.now()
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const { end } = res
res.end = function(...args) {
end.apply(this, args)
const responseTimeMs = Date.now() - startTime
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const requestSize = parseInt(req.headers['content-length'], 10)
const routePath = getRoutePath(req)
const reqUrl = req.originalUrl || req.url
if (routePath != null) {
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Metrics.timing('http_request', responseTimeMs, null, {
method: req.method,
status_code: res.statusCode,
path: routePath
})
if (requestSize) {
Metrics.summary('http_request_size_bytes', requestSize, {
method: req.method,
status_code: res.statusCode,
path: routePath
})
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}
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}
logger.info({ req, res, responseTimeMs }, '%s %s', req.method, reqUrl)
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}
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next()
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}
function getRoutePath(req) {
if (req.route && req.route.path != null) {
return req.route.path
.toString()
.replace(/\//g, '_')
.replace(/:/g, '')
.slice(1)
}
if (req.swagger && req.swagger.apiPath != null) {
return req.swagger.apiPath
}
return null
}