Remove Tail

Summary: We no longer need to Tail the logs as we stream the logs over WebSockets (see D37459924 (dcbc7c40bb))

Reviewed By: lblasa

Differential Revision: D37550482

fbshipit-source-id: 92a87f2ba1ecec140bbbb9e71df107341765ad46

desktop/app/src/init.tsx

@@ -28,12 +28,10 @@ import {
   setupPrefetcher,
   startFlipperServer,
   startServer,
-  Tail,
 } from 'flipper-server-core';
 import {
   FlipperServer,
   getLogger,
-  LoggerInfo,
   isTest,
   Logger,
   parseEnvironmentVariables,
@@ -168,11 +166,6 @@ async function getFlipperServer(
       await server.connect();
 
       await readyForIncomingConnections(server, companionEnv);
-    } else {
-      console.info('flipper-server: already running');
-      const loggerOutputFile = 'flipper-server-log.out';
-
-      tailServerLogs(path.join(staticPath, loggerOutputFile));
     }
 
     return getExternalServer(socketPath);
@@ -237,18 +230,6 @@ function getStaticDir(appPath: string) {
   return _staticPath;
 }
 
-function tailServerLogs(logsPath: string) {
-  console.info('flipper-server logs located at: ', logsPath);
-  const tail = new Tail(logsPath);
-  tail.on('line', (line: any) => {
-    try {
-      const loggerInfo: LoggerInfo = JSON.parse(line);
-      console[loggerInfo.type](loggerInfo.msg);
-    } catch (_) {}
-  });
-  tail.watch();
-}
-
 // getLogger() is not  yet created when the electron app starts.
 // we can't create it here yet, as the real logger is wired up to
 // the redux store and the rest of the world. So we create a delegating logger