feat: support APM Server intake API version 2 (#465)

Closes #356

Author: watson

docs/agent-api.asciidoc

@@ -1090,7 +1090,7 @@ Defaults to `unnamed`
 You can alternatively set this via <<span-type,`span.type`>>.
 Defaults to `custom.code`
 
-When a span is started it will measure the time until <<span-end,`span.end()`>> or <<span-truncate,`span.truncate()`>> is called.
+When a span is started it will measure the time until <<span-end,`span.end()`>> is called.
 
 See <<span-api,Span API>> docs for details on how to use custom spans.
 

docs/span-api.asciidoc

@@ -73,7 +73,7 @@ Defaults to `unnamed`
 You can alternatively set this via <<span-type,`span.type`>>.
 Defaults to `custom.code`
 
-When a span is started it will measure the time until <<span-end,`span.end()`>> or <<span-truncate,`span.truncate()`>> is called.
+When a span is started it will measure the time until <<span-end,`span.end()`>> is called.
 
 [[span-end]]
 ==== `span.end()`
@@ -86,20 +86,3 @@ span.end()
 End the span.
 If the span has already ended,
 nothing happens.
-
-A span that isn't ended before the parent transaction ends will be <<span-truncate,truncated>>.
-
-[[span-truncate]]
-==== `span.truncate()`
-
-[source,js]
-----
-span.truncate()
-----
-
-Truncates and ends the span.
-If the span is already ended or truncated,
-nothing happens.
-
-A truncated span is a special type of ended span.
-It's used to indicate that the measured event took longer than the duration recorded by the span.

docs/transaction-api.asciidoc

@@ -57,7 +57,7 @@ Think of the transaction result as equivalent to the status code of an HTTP resp
 transaction.end([result])
 ----
 
-Ends the transaction and <<span-truncate,truncates>> all un-ended child spans.
+Ends the transaction.
 If the transaction has already ended,
 nothing happens.
 

lib/agent.js

@@ -15,9 +15,9 @@ var connect = require('./middleware/connect')
 var Filters = require('./filters')
 var Instrumentation = require('./instrumentation')
 var parsers = require('./parsers')
-var request = require('./request')
 var stackman = require('./stackman')
 var symbols = require('./symbols')
+var truncate = require('./truncate')
 
 var IncomingMessage = http.IncomingMessage
 var ServerResponse = http.ServerResponse
@@ -32,6 +32,7 @@ function Agent () {
 
   this._instrumentation = new Instrumentation(this)
   this._filters = new Filters()
+  this._apmServer = null
 
   this._conf = null
   this._httpClient = null
@@ -52,6 +53,10 @@ Object.defineProperty(Agent.prototype, 'currentTransaction', {
   }
 })
 
+Agent.prototype.destroy = function () {
+  if (this._apmServer) this._apmServer.destroy()
+}
+
 Agent.prototype.startTransaction = function () {
   return this._instrumentation.startTransaction.apply(this._instrumentation, arguments)
 }
@@ -129,15 +134,35 @@ Agent.prototype.start = function (opts) {
     })
   }
 
-  this._instrumentation.start()
+  this._apmServer = new ElasticAPMHttpClient({
+    // metadata
+    agentName: 'nodejs',
+    agentVersion: version,
+    serviceName: this._conf.serviceName,
+    serviceVersion: this._conf.serviceVersion,
+    frameworkName: this._conf.frameworkName,
+    frameworkVersion: this._conf.frameworkVersion,
+    hostname: this._conf.hostname,
 
-  this._httpClient = new ElasticAPMHttpClient({
+    // Sanitize conf
+    truncateStringsAt: config.INTAKE_STRING_MAX_SIZE, // TODO: Do we need to set this (it's the default value)
+
+    // HTTP conf
     secretToken: this._conf.secretToken,
     userAgent: userAgent,
     serverUrl: this._conf.serverUrl,
     rejectUnauthorized: this._conf.verifyServerCert,
-    serverTimeout: this._conf.serverTimeout * 1000
+    serverTimeout: this._conf.serverTimeout * 1000,
+
+    // Streaming conf
+    size: this._conf.apiRequestSize,
+    time: this._conf.apiRequestTime * 1000
   })
+  this._apmServer.on('error', err => {
+    this.logger.error('An error occrued while communicating with the APM Server:', err.message)
+  })
+
+  this._instrumentation.start()
 
   Error.stackTraceLimit = this._conf.stackTraceLimit
   if (this._conf.captureExceptions) this.handleUncaughtExceptions()
@@ -285,10 +310,27 @@ Agent.prototype.captureError = function (err, opts, cb) {
   }
 
   function send (error) {
-    agent.logger.info('logging error %s with Elastic APM', id)
-    request.errors(agent, [error], (err) => {
-      if (cb) cb(err, error.id)
-    })
+    error = agent._filters.process(error) // TODO: Update filter to expect this format
+
+    if (!error) {
+      agent.logger.debug('error ignored by filter %o', { id: id })
+      cb(null, id)
+      return
+    }
+
+    truncate.error(error, agent._conf)
+
+    if (agent._apmServer) {
+      agent.logger.info(`Sending error ${id} to Elastic APM`)
+      agent._apmServer.sendError(error, function () {
+        agent._apmServer.flush(function (err) {
+          cb(err, id)
+        })
+      })
+    } else {
+      // TODO: Swallow this error just as it's done in agent.flush()?
+      process.nextTick(cb.bind(null, new Error('cannot capture error before agent is started'), id))
+    }
   }
 }
 
@@ -314,7 +356,12 @@ Agent.prototype.handleUncaughtExceptions = function (cb) {
 }
 
 Agent.prototype.flush = function (cb) {
-  this._instrumentation.flush(cb)
+  if (this._apmServer) {
+    this._apmServer.flush(cb)
+  } else {
+    this.logger.warn(new Error('cannot flush agent before it is started'))
+    process.nextTick(cb)
+  }
 }
 
 Agent.prototype.lambda = function wrapLambda (type, fn) {

lib/config.js

@@ -1,7 +1,6 @@
 'use strict'
 
 var fs = require('fs')
-var os = require('os')
 var path = require('path')
 
 var consoleLogLevel = require('console-log-level')
@@ -35,7 +34,8 @@ var DEFAULTS = {
   verifyServerCert: true,
   active: true,
   logLevel: 'info',
-  hostname: os.hostname(),
+  apiRequestSize: 1024 * 1024, // TODO: Is this the right default
+  apiRequestTime: 10, // TODO: Is this the right default. Should this be ms?
   stackTraceLimit: 50,
   captureExceptions: true,
   filterHttpHeaders: true,
@@ -51,10 +51,10 @@ var DEFAULTS = {
   sourceLinesSpanAppFrames: 0,
   sourceLinesSpanLibraryFrames: 0,
   errorMessageMaxLength: 2048,
-  flushInterval: 10,
+  flushInterval: 10, // TODO: Deprecate
   transactionMaxSpans: 500,
   transactionSampleRate: 1.0,
-  maxQueueSize: 100,
+  maxQueueSize: 100, // TODO: Deprecate
   serverTimeout: 30,
   disableInstrumentations: []
 }
@@ -68,6 +68,8 @@ var ENV_TABLE = {
   active: 'ELASTIC_APM_ACTIVE',
   logLevel: 'ELASTIC_APM_LOG_LEVEL',
   hostname: 'ELASTIC_APM_HOSTNAME',
+  apiRequestSize: 'ELASTIC_APM_API_REQUEST_SIZE',
+  apiRequestTime: 'ELASTIC_APM_API_REQUEST_TIME',
   frameworkName: 'ELASTIC_APM_FRAMEWORK_NAME',
   frameworkVersion: 'ELASTIC_APM_FRAMEWORK_VERSION',
   stackTraceLimit: 'ELASTIC_APM_STACK_TRACE_LIMIT',
@@ -105,6 +107,8 @@ var BOOL_OPTS = [
 ]
 
 var NUM_OPTS = [
+  'apiRequestSize',
+  'apiRequestTime',
   'stackTraceLimit',
   'abortedErrorThreshold',
   'flushInterval',

lib/instrumentation/index.js

@@ -3,13 +3,11 @@
 var fs = require('fs')
 var path = require('path')
 
-var AsyncValuePromise = require('async-value-promise')
 var hook = require('require-in-the-middle')
 var semver = require('semver')
 
-var Queue = require('../queue')
-var request = require('../request')
 var Transaction = require('./transaction')
+var truncate = require('../truncate')
 var shimmer = require('./shimmer')
 
 var MODULES = [
@@ -45,7 +43,6 @@ module.exports = Instrumentation
 
 function Instrumentation (agent) {
   this._agent = agent
-  this._queue = null
   this._hook = null // this._hook is only exposed for testing purposes
   this._started = false
   this.currentTransaction = null
@@ -59,21 +56,6 @@ Instrumentation.prototype.start = function () {
   var self = this
   this._started = true
 
-  var qopts = {
-    flushInterval: this._agent._conf.flushInterval,
-    maxQueueSize: this._agent._conf.maxQueueSize,
-    logger: this._agent.logger
-  }
-  this._queue = new Queue(qopts, function onFlush (transactions, done) {
-    AsyncValuePromise.all(transactions).then(function (transactions) {
-      if (self._agent._conf.active && transactions.length > 0) {
-        request.transactions(self._agent, transactions, done)
-      } else {
-        done()
-      }
-    }, done)
-  })
-
   if (this._agent._conf.asyncHooks && semver.gte(process.version, '8.2.0')) {
     require('./async-hooks')(this)
   } else {
@@ -110,27 +92,44 @@ Instrumentation.prototype._patchModule = function (exports, name, version, enabl
 }
 
 Instrumentation.prototype.addEndedTransaction = function (transaction) {
+  var agent = this._agent
+
   if (this._started) {
-    var queue = this._queue
+    var payload = agent._filters.process(transaction._encode()) // TODO: Update filter to expect this format
+    if (!payload) return agent.logger.debug('transaction ignored by filter %o', { id: transaction.id })
+    truncate.transaction(payload)
+    agent.logger.debug('sending transaction %o', { id: transaction.id })
+    agent._apmServer.sendTransaction(payload)
+  } else {
+    agent.logger.debug('ignoring transaction %o', { id: transaction.id })
+  }
+}
 
-    this._agent.logger.debug('adding transaction to queue %o', { id: transaction.id })
+Instrumentation.prototype.addEndedSpan = function (span) {
+  var agent = this._agent
 
-    var payload = new AsyncValuePromise()
+  if (this._started) {
+    agent.logger.debug('encoding span %o', { trans: span.transaction.id, name: span.name, type: span.type })
+    span._encode(function (err, payload) {
+      if (err) {
+        agent.logger.error('error encoding span %o', { trans: span.transaction.id, name: span.name, type: span.type, error: err.message })
+        return
+      }
 
-    payload.catch(function (err) {
-      this._agent.logger.error('error encoding transaction %s: %s', transaction.id, err.message)
-    })
+      payload = agent._filters.process(payload) // TODO: Update filter to expect this format
 
-    // Add the transaction payload to the queue instead of the transation
-    // object it self to free up the transaction for garbage collection
-    transaction._encode(function (err, _payload) {
-      if (err) payload.reject(err)
-      else payload.resolve(_payload)
-    })
+      if (!payload) {
+        agent.logger.debug('span ignored by filter %o', { trans: span.transaction.id, name: span.name, type: span.type })
+        return
+      }
 
-    queue.add(payload)
+      truncate.span(payload)
+
+      agent.logger.debug('sending span %o', { trans: span.transaction.id, name: span.name, type: span.type })
+      if (agent._apmServer) agent._apmServer.sendSpan(payload)
+    })
   } else {
-    this._agent.logger.debug('ignoring transaction %o', { id: transaction.id })
+    agent.logger.debug('ignoring span %o', { trans: span.transaction.id, name: span.name, type: span.type })
   }
 }
 
@@ -220,11 +219,3 @@ Instrumentation.prototype._recoverTransaction = function (trans) {
 
   this.currentTransaction = trans
 }
-
-Instrumentation.prototype.flush = function (cb) {
-  if (this._queue) {
-    this._queue.flush(cb)
-  } else {
-    process.nextTick(cb)
-  }
-}

lib/instrumentation/span.js

@@ -14,7 +14,6 @@ module.exports = Span
 function Span (transaction) {
   this.transaction = transaction
   this.started = false
-  this.truncated = false
   this.ended = false
   this.name = null
   this.type = null
@@ -50,18 +49,6 @@ Span.prototype.customStackTrace = function (stackObj) {
   this._recordStackTrace(stackObj)
 }
 
-Span.prototype.truncate = function () {
-  if (!this.started) {
-    this._agent.logger.debug('tried to truncate non-started span - ignoring %o', { id: this.transaction.id, name: this.name, type: this.type })
-    return
-  } else if (this.ended) {
-    this._agent.logger.debug('tried to truncate already ended span - ignoring %o', { id: this.transaction.id, name: this.name, type: this.type })
-    return
-  }
-  this.truncated = true
-  this.end()
-}
-
 Span.prototype.end = function () {
   if (!this.started) {
     this._agent.logger.debug('tried to call span.end() on un-started span %o', { id: this.transaction.id, name: this.name, type: this.type })
@@ -75,8 +62,8 @@ Span.prototype.end = function () {
   this._agent._instrumentation._recoverTransaction(this.transaction)
 
   this.ended = true
-  this._agent.logger.debug('ended span %o', { id: this.transaction.id, name: this.name, type: this.type, truncated: this.truncated })
-  this.transaction._recordEndedSpan(this)
+  this._agent.logger.debug('ended span %o', { id: this.transaction.id, name: this.name, type: this.type })
+  this._agent._instrumentation.addEndedSpan(this)
 }
 
 Span.prototype.duration = function () {
@@ -157,8 +144,10 @@ Span.prototype._encode = function (cb) {
     }
 
     var payload = {
+      transactionId: self.transaction.id,
+      timestamp: self.transaction.timestamp,
       name: self.name,
-      type: self.truncated ? self.type + '.truncated' : self.type,
+      type: self.type,
       start: self.offsetTime(),
       duration: self.duration()
     }