This pull request fixes#143803 by taking advantage of Dart's null-aware operators.
And unlike `switch` expressions ([9 PRs](https://github.com/flutter/flutter/pull/143634) and counting), the Flutter codebase is already fantastic when it comes to null-aware coding. After refactoring the entire repo, all the changes involving `?.` and `??` can fit into a single pull request.
Fixes https://github.com/flutter/flutter/issues/139709
This adds a static helper method `ProcessUtils.writelnToStdinGuarded()`, which will asynchronously write to a sub-process's STDIN `IOSink` and catch errors.
In talking with Brian, it sounds like this is the best and most reliable way to catch `SocketException`s during these writes *to sub-process file descriptors* specifically (with a "real" hard drive file, the future returned by `.flush()` should complete with the write error).
Also, as I note in the dartdoc to `writelnToStdinGuarded()`, the behavior seems to be different between macOS and linux.
Moving forward, in any place where we want to catch exceptions writing to STDIN, we will want to use this new helper.
Sometimes `ios-deploy` loses connection to the device after installing, starting debugserver, and launching. This is shown with an error message like:
```
Process 579 exited with status = -1 (0xffffffff) lost connection
```
This happens frequently in our CI system: https://github.com/flutter/flutter/issues/120808
Usually in CI, on retry it'll work and pass - so this is an attempt to retry without failing the test first. It's not guaranteed to fix since we're unable to recreate this error locally.
Adding debugging for https://github.com/flutter/flutter/issues/129836.
Takes a screenshot when startup test takes too long (10 minutes).
Also, removes some old debugging and add new debugging message.
This reverts commit a19b3436eead2e64bb2b014f14afcd8fab8c9d32.
We added this logging to try and determine if the reason for Dart VM errors (https://github.com/flutter/flutter/issues/121231) was caused by some issue with the streams.
A recent test proves that is not the case:
https://ci.chromium.org/ui/p/flutter/builders/prod/Mac_ios%20platform_view_ios__start_up/11046/overview
The test shows the Dart VM url in the device log. However, the test log does NOT show a log for the Dart VM url but does show the stack trace, which all come from the main stream, which means it's not an issue with the secondary streams not receiving the log.
So reverting the debugging we added.
Log all output of `ios-deploy` to try and determine if the issue of https://github.com/flutter/flutter/issues/121231 is with stream or with `ios-deploy`.
Note: This will cause some duplicate logs like example below but only in verbose mode
```
(lldb) 2023-05-19 13:48:19.107935-0500 Runner[2521:390363] [VERBOSE-2:FlutterDarwinContextMetalImpeller.mm(35)] Using the Impeller rendering backend.
(lldb) 2023-05-19 13:48:19.107935-0500 Runner[2521:390363] [VERBOSE-2:FlutterDarwinContextMetalImpeller.mm(35)] Using the Impeller rendering backend.
2023-05-19 13:48:19.156866-0500 Runner[2521:390612] flutter: The Dart VM service is listening on http://127.0.0.1:63508/IsFnhXJykCM=/
VM Service URL on device: http://127.0.0.1:63508/IsFnhXJykCM=/
```
Check what is available in the device's iOS DeviceSupport folder to check if symbols were properly fetched. Also, add some logging to track what status the debugger is in.
Debugging for https://github.com/flutter/flutter/issues/121231.
* Update flutter_tools to look for new VM service message
The Dart SDK will soon move away from the current Observatory message:
"Observatory listening on ..."
To a new message that no longer references Observatory:
"Dart VM Service listening on ..."
This change updates all tests with mocks to check for the new message
and also adds support for the new message in ProtocolDiscovery.
See https://github.com/dart-lang/sdk/issues/46756
* Fix some parsing locations
* Fix analysis failures
* Update message
* Remove extra comment
* Update message
* Add globals prefix
Our current top crasher is an unclear error when ProcessManager fails to resolve an executable path. To fix this, we'd like to being adjusting the process resolution logic and adding more instrumentation to track failures. In order to begin the process, the ProcessManager has been folded back into the flutter tool
Reland of #67669
The flutter tool has a number of crashes on stable where an ArgumentError is thrown due to the process manager not being able to resolve an executable.
So that we can adjust/modify this logic, fold it into flutter and add some additional logging.
caches the resolved executable per target directory, to avoid repeated look ups.
Instead of throwing an argument error, attempts to run the executable as given if an exact path can't be found
Accept files or symlinks for the executable path.
user where/which to resolve path instead of package:process logic.
The flutter tool has a number of crashes on stable where an ArgumentError is thrown due to the process manager not being able to resolve an executable. Fold the resolution logic into the tool and use where/which instead of the package:process specific logic.
