overleaf/services/document-updater/app/js/PersistenceManager.js

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const Settings = require('@overleaf/settings')
const Errors = require('./Errors')
const Metrics = require('./Metrics')
const logger = require('@overleaf/logger')
const request = require('requestretry').defaults({
maxAttempts: 2,
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retryDelay: 10,
})
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// We have to be quick with HTTP calls because we're holding a lock that
// expires after 30 seconds. We can't let any errors in the rest of the stack
// hold us up, and need to bail out quickly if there is a problem.
const MAX_HTTP_REQUEST_LENGTH = 5000 // 5 seconds
function updateMetric(method, error, response) {
// find the status, with special handling for connection timeouts
// https://github.com/request/request#timeouts
let status
if (error && error.connect === true) {
status = `${error.code} (connect)`
} else if (error) {
status = error.code
} else if (response) {
status = response.statusCode
}
Metrics.inc(method, 1, { status })
if (error && error.attempts > 1) {
Metrics.inc(`${method}-retries`, 1, { status: 'error' })
}
if (response && response.attempts > 1) {
Metrics.inc(`${method}-retries`, 1, { status: 'success' })
}
}
function getDoc(projectId, docId, options = {}, _callback) {
const timer = new Metrics.Timer('persistenceManager.getDoc')
if (typeof options === 'function') {
_callback = options
options = {}
}
const callback = function (...args) {
timer.done()
_callback(...args)
}
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const urlPath = `/project/${projectId}/doc/${docId}`
const requestParams = {
url: `${Settings.apis.web.url}${urlPath}`,
method: 'GET',
headers: {
accept: 'application/json',
},
auth: {
user: Settings.apis.web.user,
pass: Settings.apis.web.pass,
sendImmediately: true,
},
jar: false,
timeout: MAX_HTTP_REQUEST_LENGTH,
}
if (options.peek) {
requestParams.qs = { peek: 'true' }
}
request(requestParams, (error, res, body) => {
updateMetric('getDoc', error, res)
if (error) {
logger.error({ err: error, projectId, docId }, 'web API request failed')
return callback(new Error('error connecting to web API'))
}
if (res.statusCode >= 200 && res.statusCode < 300) {
try {
body = JSON.parse(body)
} catch (e) {
return callback(e)
}
if (body.lines == null) {
return callback(new Error('web API response had no doc lines'))
}
if (body.version == null) {
return callback(new Error('web API response had no valid doc version'))
}
if (body.pathname == null) {
return callback(new Error('web API response had no valid doc pathname'))
}
if (!body.pathname) {
logger.warn(
{ projectId, docId },
'missing pathname in PersistenceManager getDoc'
)
Metrics.inc('pathname', 1, {
path: 'PersistenceManager.getDoc',
status: body.pathname === '' ? 'zero-length' : 'undefined',
})
}
callback(
null,
body.lines,
body.version,
body.ranges,
body.pathname,
body.projectHistoryId,
body.projectHistoryType
)
} else if (res.statusCode === 404) {
callback(new Errors.NotFoundError(`doc not not found: ${urlPath}`))
} else if (res.statusCode === 413) {
callback(
new Errors.FileTooLargeError(`doc exceeds maximum size: ${urlPath}`)
)
} else {
callback(
new Error(`error accessing web API: ${urlPath} ${res.statusCode}`)
)
}
})
}
function setDoc(
projectId,
docId,
lines,
version,
ranges,
lastUpdatedAt,
lastUpdatedBy,
_callback
) {
const timer = new Metrics.Timer('persistenceManager.setDoc')
const callback = function (...args) {
timer.done()
_callback(...args)
}
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const urlPath = `/project/${projectId}/doc/${docId}`
request(
{
url: `${Settings.apis.web.url}${urlPath}`,
method: 'POST',
json: {
lines,
ranges,
version,
lastUpdatedBy,
lastUpdatedAt,
},
auth: {
user: Settings.apis.web.user,
pass: Settings.apis.web.pass,
sendImmediately: true,
},
jar: false,
timeout: MAX_HTTP_REQUEST_LENGTH,
},
(error, res, body) => {
updateMetric('setDoc', error, res)
if (error) {
logger.error({ err: error, projectId, docId }, 'web API request failed')
return callback(new Error('error connecting to web API'))
}
if (res.statusCode >= 200 && res.statusCode < 300) {
callback(null)
} else if (res.statusCode === 404) {
callback(new Errors.NotFoundError(`doc not not found: ${urlPath}`))
} else if (res.statusCode === 413) {
callback(
new Errors.FileTooLargeError(`doc exceeds maximum size: ${urlPath}`)
)
} else {
callback(
new Error(`error accessing web API: ${urlPath} ${res.statusCode}`)
)
}
}
)
}
module.exports = { getDoc, setDoc }