Do not log the cancelled flipper export as a failure

Summary: Currently cancelling the flipper export logs the event as a failure. This diff introduces one more event log type called cancelled.

Reviewed By: jknoxville

Differential Revision: D16711110

fbshipit-source-id: 308b7e64974610dbb17bd14b2425f6d939c99313

src/utils/Idler.js

@@ -4,6 +4,9 @@
  * LICENSE file in the root directory of this source tree.
  * @format
  */
+
+import {CancelledPromiseError} from './errors.tsx';
+
 export class Idler {
   lastIdle: number;
   interval: number;
@@ -17,7 +20,7 @@ export class Idler {
 
   idle(): Promise<void> {
     if (this.kill) {
-      throw new Error('Idler got killed');
+      throw new CancelledPromiseError('Idler got killed');
     }
     const now = performance.now();
     if (now - this.lastIdle > this.interval) {

src/utils/errors.tsx

@@ -5,6 +5,12 @@
  * @format
  */
 
+export class CancelledPromiseError extends Error {
+  constructor(msg: string) {
+    super(msg);
+    this.name = 'CancelledPromiseError';
+  }
+}
 export function getStringFromErrorLike(e: any) {
   if (typeof e == 'string') {
     return e;

src/utils/metrics.js

@@ -6,6 +6,7 @@
  */
 
 import {getInstance} from '../fb-stubs/Logger.tsx';
+import {CancelledPromiseError} from './errors.tsx';
 
 export class UnsupportedError extends Error {
   constructor(message: string) {
@@ -30,11 +31,17 @@ export function reportPlatformFailures<T>(
       return fulfilledValue;
     },
     rejectionReason => {
-      logPlatformSuccessRate(name, {
-        isSuccess: false,
-        supportedOperation: !(rejectionReason instanceof UnsupportedError),
-        error: rejectionReason,
-      });
+      if (rejectionReason instanceof CancelledPromiseError) {
+        logPlatformSuccessRate(name, {
+          isCancelled: true,
+        });
+      } else {
+        logPlatformSuccessRate(name, {
+          isSuccess: false,
+          supportedOperation: !(rejectionReason instanceof UnsupportedError),
+          error: rejectionReason,
+        });
+      }
       return Promise.reject(rejectionReason);
     },
   );
@@ -58,11 +65,17 @@ export function reportPluginFailures<T>(
       return fulfilledValue;
     },
     rejectionReason => {
-      logPluginSuccessRate(name, plugin, {
-        isSuccess: false,
-        supportedOperation: !(rejectionReason instanceof UnsupportedError),
-        error: rejectionReason,
-      });
+      if (rejectionReason instanceof CancelledPromiseError) {
+        logPluginSuccessRate(name, plugin, {
+          isCancelled: true,
+        });
+      } else {
+        logPluginSuccessRate(name, plugin, {
+          isSuccess: false,
+          supportedOperation: !(rejectionReason instanceof UnsupportedError),
+          error: rejectionReason,
+        });
+      }
       return Promise.reject(rejectionReason);
     },
   );
@@ -92,11 +105,14 @@ export function tryCatchReportPlatformFailures<T>(
 
 type Result =
   | {isSuccess: true}
+  | {isCancelled: true}
   | {isSuccess: false, supportedOperation: boolean, error: any};
 
 function logPlatformSuccessRate(name: string, result: Result) {
   if (result.isSuccess) {
     getInstance().track('success-rate', name, {value: 1});
+  } else if (result.isCancelled) {
+    getInstance().track('operation-cancelled', name);
   } else {
     getInstance().track('success-rate', name, {
       value: 0,
@@ -109,6 +125,8 @@ function logPlatformSuccessRate(name: string, result: Result) {
 function logPluginSuccessRate(name: string, plugin: string, result: Result) {
   if (result.isSuccess) {
     getInstance().track('success-rate', name, {value: 1}, plugin);
+  } else if (result.isCancelled) {
+    getInstance().track('operation-cancelled', name, undefined, plugin);
   } else {
     getInstance().track(
       'success-rate',