Add FlipperServerDisconnectedError to prevent excessive error logging

Reviewed By: passy

Differential Revision: D51393196

fbshipit-source-id: f49857b397a3fb629ad44f89a4c59b12ba2f67c4

desktop/flipper-common/src/index.tsx

@@ -54,6 +54,7 @@ export {
   isConnectivityOrAuthError,
   isError,
   isAuthError,
+  FlipperServerDisconnectedError,
   getStringFromErrorLike,
   getErrorFromErrorLike,
   deserializeRemoteError,

desktop/flipper-common/src/utils/errors.tsx

@@ -96,6 +96,12 @@ export class NoLongerConnectedToClientError extends Error {
   name: 'NoLongerConnectedToClientError';
 }
 
+export class FlipperServerDisconnectedError extends Error {
+  constructor(public readonly reason: 'ws-close') {
+    super(`Flipper Server disconnected. Reason: ${reason}`);
+  }
+}
+
 declare global {
   interface Error {
     interaction?: unknown;

desktop/flipper-frontend-core/src/plugins.tsx

@@ -11,6 +11,7 @@ import {
   InstalledPluginDetails,
   tryCatchReportPluginFailuresAsync,
   notNull,
+  FlipperServerDisconnectedError,
 } from 'flipper-common';
 import {ActivatablePluginDetails, ConcretePluginDetails} from 'flipper-common';
 import {reportUsage} from 'flipper-common';
@@ -229,7 +230,15 @@ export const createRequirePluginFunction =
         return pluginDefinition;
       } catch (e) {
         failedPlugins.push([pluginDetails, e.message]);
-        console.error(`Plugin ${pluginDetails.id} failed to load`, e);
+
+        let severity: 'error' | 'warn' = 'error';
+        if (
+          e instanceof FlipperServerDisconnectedError &&
+          e.reason === 'ws-close'
+        ) {
+          severity = 'warn';
+        }
+        console[severity](`Plugin ${pluginDetails.id} failed to load`, e);
         return null;
       }
     };

desktop/flipper-server-client/src/FlipperServerClient.tsx

@@ -14,6 +14,7 @@ import {
   FlipperServerCommands,
   FlipperServerExecOptions,
   ServerWebSocketMessage,
+  FlipperServerDisconnectedError,
 } from 'flipper-common';
 import ReconnectingWebSocket from 'reconnecting-websocket';
 
@@ -90,7 +91,7 @@ export function createFlipperServerWithSocket(
       onStateChange(FlipperServerState.DISCONNECTED);
 
       pendingRequests.forEach((r) =>
-        r.reject(new Error('flipper-server disconnected')),
+        r.reject(new FlipperServerDisconnectedError('ws-close')),
       );
       pendingRequests.clear();
     });