Initial commit for Chrome metainstaller on Mac.

chrome/installer/mac/app/main.m

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import <Foundation/Foundation.h>
+#import "downloader.h"
+#import "systemInfo.h"
+#import "OmahaXMLRequest.h"
+#import "OmahaCommunication.h"
+
+void talkToOmahaThenExecuteBlock(AfterBlock block) {
+  NSXMLDocument* requestBody = [OmahaXMLRequest
+                    createXMLRequestBodyWithOS:[SystemInfo getOSVersion]
+                               andArchitecture:[SystemInfo getArch]];
+  OmahaCommunication* messenger = [[OmahaCommunication alloc]
+                                   initWithBody:requestBody];
+  [messenger createOmahaRequest];
+  [messenger setResponseHandlingWithBlock:block];
+  [messenger sendRequest];
+}
+
+int main(){
+  talkToOmahaThenExecuteBlock(^(NSData* data) {

[Elly Fong-Jones, 2016/07/06 15:22:02]

This is taking the kind of shape we were talking about, but I think we'll want
separate functions for each of the "steps", since otherwise this will start to
look like this:

talkToOmahaThenExecuteBlock(...,
downloadChromeImageToDownloadsDirectoryThenExecuteBlock(...,
unpackChromeImageThenExecuteBlock(..., ...)))

and it will probably get quite hard to read.

I think we should make a class (just internal to this file) that has, like,
onOmahaRequestCompleted:, onImageDownloadCompleted:, and so on, then have each
handler function kick off the "next" step (and it can also update the UI), so
for example onOmahaRequestCompleted: would be like:

[download downloadChromeImageToDownloadsDirectory:data
withCallback:@selector(onImageDownloadCompleted:) delegate:self] or something,
to arrange for the downloader to run the "next step" when it completes.

+    Downloader* download = [[Downloader alloc] init];
+    [download downloadChromeImageToDownloadsDirectory: data];
+  });
+
+  // [[NSRunLoop mainRunLoop] run];
+  [[NSRunLoop mainRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow:3]];

[Elly Fong-Jones, 2016/07/06 15:22:02]

why 3?

[Anna Zeng, 2016/07/07 15:24:53]

it's 3 for random testing purposes; we usually use 1 though. later we intend on
simply using run, but for now we are saving ourselves from typing control-c too
often haha

+}