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http-shared.js
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http-shared.js
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'use strict'
var url = require('url')
var endOfStream = require('end-of-stream')
var httpRequestToUrl = require('http-request-to-url')
var { parseUrl } = require('../parsers')
var { getHTTPDestination } = require('./context')
const transactionForResponse = new WeakMap()
exports.transactionForResponse = transactionForResponse
exports.instrumentRequest = function (agent, moduleName) {
var ins = agent._instrumentation
return function (orig) {
return function (event, req, res) {
if (event === 'request') {
agent.logger.debug('intercepted request event call to %s.Server.prototype.emit for %s', moduleName, req.url)
if (isRequestBlacklisted(agent, req)) {
agent.logger.debug('ignoring blacklisted request to %s', req.url)
// don't leak previous transaction
agent._instrumentation.currentTransaction = null
} else {
var traceparent = req.headers['elastic-apm-traceparent'] || req.headers.traceparent
var tracestate = req.headers.tracestate
var trans = agent.startTransaction(null, null, {
childOf: traceparent,
tracestate: tracestate
})
trans.type = 'request'
trans.req = req
trans.res = res
transactionForResponse.set(res, trans)
ins.bindEmitter(req)
ins.bindEmitter(res)
endOfStream(res, function (err) {
if (trans.ended) return
if (!err) return trans.end()
if (agent._conf.errorOnAbortedRequests) {
var duration = trans._timer.elapsed()
if (duration > (agent._conf.abortedErrorThreshold * 1000)) {
agent.captureError('Socket closed with active HTTP request (>' + agent._conf.abortedErrorThreshold + ' sec)', {
request: req,
extra: { abortTime: duration }
})
}
}
// Handle case where res.end is called after an error occurred on the
// stream (e.g. if the underlying socket was prematurely closed)
const end = res.end
res.end = function () {
const result = end.apply(this, arguments)
trans.end()
return result
}
})
}
}
return orig.apply(this, arguments)
}
}
}
function isRequestBlacklisted (agent, req) {
var i
for (i = 0; i < agent._conf.ignoreUrlStr.length; i++) {
if (agent._conf.ignoreUrlStr[i] === req.url) return true
}
for (i = 0; i < agent._conf.ignoreUrlRegExp.length; i++) {
if (agent._conf.ignoreUrlRegExp[i].test(req.url)) return true
}
for (i = 0; i < agent._conf.transactionIgnoreUrlRegExp.length; i++) {
if (agent._conf.transactionIgnoreUrlRegExp[i].test(req.url)) return true
}
var ua = req.headers['user-agent']
if (!ua) return false
for (i = 0; i < agent._conf.ignoreUserAgentStr.length; i++) {
if (ua.indexOf(agent._conf.ignoreUserAgentStr[i]) === 0) return true
}
for (i = 0; i < agent._conf.ignoreUserAgentRegExp.length; i++) {
if (agent._conf.ignoreUserAgentRegExp[i].test(ua)) return true
}
return false
}
function formatURL (item) {
return {
href: item.href,
pathname: item.pathname,
path: item.pathname + (item.search || ''),
protocol: item.protocol,
host: item.host,
port: item.port,
hostname: item.hostname,
hash: item.hash,
search: item.search
}
}
// NOTE: This will also stringify and parse URL instances
// to a format which can be mixed into the options object.
function ensureUrl (v) {
if (typeof v === 'string') {
return formatURL(parseUrl(v))
} else if (url.URL && v instanceof url.URL) {
return formatURL(v)
} else {
return v
}
}
function getSafeHost (res) {
return res.getHeader ? res.getHeader('Host') : res._headers.host
}
exports.traceOutgoingRequest = function (agent, moduleName, method) {
var ins = agent._instrumentation
return function (orig) {
return function (...args) {
// TODO: See if we can delay the creation of span until the `response`
// event is fired, while still having it have the correct stack trace
var span = agent.startSpan(null, 'external', moduleName, 'http')
var id = span && span.transaction.id
agent.logger.debug('intercepted call to %s.%s %o', moduleName, method, { id: id })
var options = {}
var newArgs = [options]
for (const arg of args) {
if (typeof arg === 'function') {
newArgs.push(arg)
} else {
Object.assign(options, ensureUrl(arg))
}
}
if (!options.headers) options.headers = {}
// Attempt to use the span context as a traceparent header.
// If the transaction is unsampled the span will not exist,
// however a traceparent header must still be propagated
// to indicate requested services should not be sampled.
// Use the transaction context as the parent, in this case.
var parent = span || agent.currentTransaction
if (parent && parent._context && shouldPropagateTraceContext(options)) {
const headerValue = parent._context.toTraceParentString()
const traceStateValue = parent._context.toTraceStateString()
options.headers.traceparent = headerValue
options.headers.tracestate = traceStateValue
if (agent._conf.useElasticTraceparentHeader) {
options.headers['elastic-apm-traceparent'] = headerValue
}
}
var req = orig.apply(this, newArgs)
if (!span) return req
if (getSafeHost(req) === agent._conf.serverHost) {
agent.logger.debug('ignore %s request to intake API %o', moduleName, { id: id })
return req
} else {
var protocol = req.agent && req.agent.protocol
agent.logger.debug('request details: %o', { protocol: protocol, host: getSafeHost(req), id: id })
}
ins.bindEmitter(req)
span.name = req.method + ' ' + getSafeHost(req) + parseUrl(req.path).pathname
// TODO: Research if it's possible to add this to the prototype instead.
// Or if it's somehow preferable to listen for when a `response` listener
// is added instead of when `response` is emitted.
const emit = req.emit
req.emit = function (type, res) {
if (type === 'response') onresponse(res)
if (type === 'abort') onAbort(type)
return emit.apply(req, arguments)
}
let url, statusCode
httpRequestToUrl(req).then(_url => {
url = _url
}).catch(() => {
agent.logger.warn('unable to identify http.ClientRequest url %o', { id: id })
})
return req
// In case the request is ended prematurely
function onAbort (type) {
if (span.ended) return
agent.logger.debug('intercepted http.ClientRequest abort event %o', { id: id })
onEnd()
}
function onEnd () {
span.setHttpContext({
method: req.method,
status_code: statusCode,
url
})
// Add destination info only when socket conn is established
if (url) {
// The `getHTTPDestination` function might throw in case an
// invalid URL is given to the `URL()` function. Until we can
// be 100% sure this doesn't happen, we better catch it here.
// For details, see:
// https://github.com/elastic/apm-agent-nodejs/issues/1769
try {
span.setDestinationContext(getHTTPDestination(url, span.type))
} catch (e) {
agent.logger.error('Could not set destination context: %s', e.message)
}
}
span._setOutcomeFromHttpStatusCode(statusCode)
span.end()
}
function onresponse (res) {
// Work around async_hooks bug in Node.js 12.0 - 12.2 (https://github.com/nodejs/node/pull/27477)
ins._recoverTransaction(span.transaction)
agent.logger.debug('intercepted http.ClientRequest response event %o', { id: id })
ins.bindEmitter(res)
statusCode = res.statusCode
res.prependListener('end', function () {
agent.logger.debug('intercepted http.IncomingMessage end event %o', { id: id })
onEnd()
})
}
}
}
}
function shouldPropagateTraceContext (opts) {
return !isAWSSigned(opts)
}
function isAWSSigned (opts) {
const auth = opts.headers && (opts.headers.Authorization || opts.headers.authorization)
return typeof auth === 'string' ? auth.startsWith('AWS4-') : false
}