overleaf/libraries/logger/gcp-manager.js

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const bunyan = require('bunyan')
/**
* When we copy log entry fields, omit some bunyan core fields that are not
* interesting, that have a special meaning in GCP, or that we will process
* separately.
*/
const ENTRY_FIELDS_TO_OMIT = [
'level',
'name',
'hostname',
'v',
'pid',
'msg',
'err',
'req',
'res'
]
/**
* Convert a bunyan log entry to a format that GCP understands
*/
function convertLogEntry(entry) {
const gcpEntry = omit(entry, ENTRY_FIELDS_TO_OMIT)
// Error information. In GCP, the stack trace goes in the message property.
// This enables the error reporting feature.
if (entry.err) {
if (entry.err.info) {
Object.assign(gcpEntry, entry.err.info)
}
if (entry.err.code) {
gcpEntry.code = entry.err.code
}
if (entry.err.signal) {
gcpEntry.signal = entry.err.signal
}
if (entry.err.stack) {
gcpEntry.message = entry.err.stack
}
if (entry.name) {
gcpEntry.serviceContext = { service: entry.name }
}
} else {
gcpEntry.message = entry.msg
}
// Severity
if (entry.level) {
gcpEntry.severity = bunyan.nameFromLevel[entry.level]
}
// HTTP request information
if (entry.req || entry.res || entry.responseTimeMs) {
const httpRequest = {}
if (entry.req) {
const req = entry.req
httpRequest.requestMethod = req.method
httpRequest.requestUrl = req.url
httpRequest.remoteIp = req.remoteAddress
if (req.headers) {
if (req.headers['content-length']) {
httpRequest.requestSize = parseInt(req.headers['content-length'], 10)
}
httpRequest.userAgent = req.headers['user-agent']
httpRequest.referer = req.headers.referer
}
}
if (entry.res) {
const res = entry.res
httpRequest.status = res.statusCode
if (res.headers && res.headers['content-length']) {
if (res.headers['content-length']) {
httpRequest.responseSize = parseInt(res.headers['content-length'], 10)
}
}
}
if (entry.responseTimeMs) {
const responseTimeSec = entry.responseTimeMs / 1000
httpRequest.latency = `${responseTimeSec}s`
}
gcpEntry.httpRequest = httpRequest
}
// Labels are indexed in GCP. We copy the project, doc and user ids to labels to enable fast filtering
const projectId = gcpEntry.projectId || gcpEntry.project_id
const userId = gcpEntry.userId || gcpEntry.user_id
const docId = gcpEntry.docId || gcpEntry.doc_id
if (projectId || userId || docId) {
const labels = {}
if (projectId) {
labels.projectId = projectId
}
if (userId) {
labels.userId = userId
}
if (docId) {
labels.docId = docId
}
gcpEntry['logging.googleapis.com/labels'] = labels
}
return gcpEntry
}
function omit(obj, excludedFields) {
return Object.fromEntries(
Object.entries(obj).filter(([key]) => !excludedFields.includes(key))
)
}
module.exports = { convertLogEntry }