Move sending root event to own script

circle.yml

@@ -208,7 +208,7 @@ commands:
             - v{{ .Environment.CACHE_VERSION }}-{{ arch }}-system-tests-projects-node-modules-cache-state-{{ checksum "system_tests_cache_key" }}
       - run:
           name: Send root honeycomb event for this CI build
-          command: cd system-tests/lib && node ./performance-reporter.js
+          command: cd system-tests/scripts && node ./send-root-honecomb-event.js
       - run:
           name: Bail if specific cache exists
           command: |

system-tests/lib/performance-reporter.js

@@ -12,16 +12,32 @@ const honey = new Libhoney({
   writeKey: process.env.HONEYCOMB_API_KEY,
 })
 
+// This event is created here independently every time the reporter
+// is imported (in each parallel instance of the system-tests
+// in circleci) so that we can use it as the parent,
+// but ../scripts/send-root-honeycomb-event.js
+// is only invoked once at the start of the build,
+// and is responsible for sending it to honeycomb.
 const spanId = process.env.CIRCLE_WORKFLOW_ID || uuidv4()
 const circleCiRootEvent = honey.newEvent()
 
+circleCiRootEvent.timestamp = Date.now()
+circleCiRootEvent.add({
+  buildUrl: process.env.CIRCLE_BUILD_URL,
+  platform: process.platform,
+  arch: process.arch,
+
+  spanId,
+  traceId: spanId,
+})
+
 // Mocha events ('test', 'test end', etc) have no way to wait
 // for async callbacks, so we can't guarantee we have this
 // data ready by the time any of the reporter's events are emitted.
 
 // Therefore, we have each honeycomb event await this promise
 // before sending itself.
-let asyncInfo = Promise.all([getNextVersionForPath('../../packages'), commitInfo()])
+let asyncInfo = Promise.all([getNextVersionForPath(path.resolve(__dirname, '../../packages')), commitInfo()])
 .then(([nextVersion, commitInformation]) => {
   const ciInformation = ciProvider.commitParams() || {}
 
@@ -39,26 +55,6 @@ function addAsyncInfoAndSend (honeycombEvent) {
   })
 }
 
-circleCiRootEvent.timestamp = Date.now()
-circleCiRootEvent.add({
-  buildUrl: process.env.CIRCLE_BUILD_URL,
-  platform: process.platform,
-  arch: process.arch,
-
-  spanId,
-  traceId: spanId,
-})
-
-// This file is executed once as a script at the beginning of the circleci build,
-// so that we can send the root event exactly once and associate all the various
-// system test tasks and build steps into a single span.
-if (require.main === module) {
-  addAsyncInfoAndSend(circleCiRootEvent).then(() => {
-    console.log(circleCiRootEvent.data)
-    honey.flush()
-  })
-}
-
 class HoneycombReporter {
   constructor (runner) {
     if (!process.env.HONEYCOMB_API_KEY) {
@@ -148,3 +144,7 @@ class HoneycombReporter {
 }
 
 module.exports = HoneycombReporter
+
+HoneycombReporter.honey = honey
+HoneycombReporter.circleCiRootEvent = circleCiRootEvent
+HoneycombReporter.addAsyncInfoAndSend = addAsyncInfoAndSend

system-tests/scripts/send-root-honecomb-event.js

@@ -0,0 +1,13 @@
+const { addAsyncInfoAndSend, circleCiRootEvent, honey } = require('../lib/performance-reporter')
+
+// This file is executed once during the circleci build,
+// so that we can send the root event honeycomb event for this
+// run of the system tests exactly once.
+// All the system test build hosts reference this root event,
+// joining them into a single trace.
+if (require.main === module) {
+  addAsyncInfoAndSend(circleCiRootEvent).then(() => {
+    console.log(circleCiRootEvent.data)
+    honey.flush()
+  })
+}