Adds a new helpful tool exit message for SocketExceptions thrown during mdns discovery #157638

LouiseHsu · 2024-10-25T20:58:14Z

Addresses #150131, but doesn't fix it, as there seem to be cases where the steps included in the messages added in this PR don't work.

Pre-launch Checklist

I read the [Contributor Guide] and followed the process outlined there for submitting PRs.
I read the [Tree Hygiene] wiki page, which explains my responsibilities.
I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement].
I signed the [CLA].
I listed at least one issue that this PR fixes in the description above.
I updated/added relevant documentation (doc comments with ///).
I added new tests to check the change I am making, or this PR is [test-exempt].
I followed the [breaking change policy] and added [Data Driven Fixes] where supported.
All existing and new tests are passing.

packages/flutter_tools/lib/src/mdns_discovery.dart

loic-sharma · 2024-10-29T22:53:01Z

packages/flutter_tools/lib/src/mdns_discovery.dart

+            'You may be having a permissions issue with your IDE. '
+                'Please try going to '
+                'System Settings -> Privacy & Security -> Local Network -> '
+                '[Find your IDE] -> Toggle ON, then restarting your phone.',


Minor formatting nit:

Suggested change

'You may be having a permissions issue with your IDE. '

'Please try going to '

'System Settings -> Privacy & Security -> Local Network -> '

'[Find your IDE] -> Toggle ON, then restarting your phone.',

'You might be having a permissions issue with your IDE. '

'Please try going to '

'System Settings -> Privacy & Security -> Local Network -> '

'[Find your IDE] -> Toggle ON, then restarting your phone.',

loic-sharma · 2024-10-29T22:53:16Z

packages/flutter_tools/lib/src/mdns_discovery.dart

+                '[Find your IDE] -> Toggle ON, then restarting your phone.',
+          );
+        } else {
+          throwToolExit('');


Should we just rethrow; here instead? Or perhaps add a generic message like Unable to listen for mDNS connections?

Ah, i think rethrow is better. I will add that.

loic-sharma · 2024-10-29T22:55:29Z

packages/flutter_tools/test/general.shard/mdns_discovery_test.dart

  final Map<String, List<TxtResourceRecord>> txtResponse;
  final Map<String, List<IPAddressResourceRecord>> ipResponse;
  final bool osErrorOnStart;
+  final bool socketErrorOnStart;


Ultra pendantic nit: errors in Dart are unrecoverable exceptions that shouldn't be caught (see this doc). I'd consider renaming this to socketExceptionOnStart

loic-sharma · 2024-10-30T18:28:44Z

packages/flutter_tools/lib/src/mdns_discovery.dart

+          throwToolExit(
+              'You might be having a permissions issue with your IDE. '
+              'Please try going to '
+              'System Settings -> Privacy & Security -> Local Network -> '
+              '[Find your IDE] -> Toggle ON, then restart your phone.');


Style nit:

Suggested change

throwToolExit(

'You might be having a permissions issue with your IDE. '

'Please try going to '

'System Settings -> Privacy & Security -> Local Network -> '

'[Find your IDE] -> Toggle ON, then restart your phone.');

throwToolExit(

'You might be having a permissions issue with your IDE. '

'Please try going to '

'System Settings -> Privacy & Security -> Local Network -> '

'[Find your IDE] -> Toggle ON, then restart your phone.',

);

wtf. I think my copy pasting is not perserving the spaces correctly.

You might have autoformat on, you should disable it for the Flutter repo (but you might want to keep it for the packages repo)

loic-sharma · 2024-10-30T18:33:11Z

packages/flutter_tools/test/general.shard/mdns_discovery_test.dart

+          throwsToolExit(message: 'You might be having a permissions issue with your IDE. '
+            'Please try going to '
+            'System Settings -> Privacy & Security -> Local Network -> '
+            '[Find your IDE] -> Toggle ON, then restart your phone.')


Hm I'm not sure how you're supposed to format a multi line string argument value... Maybe this?

Suggested change

throwsToolExit(message: 'You might be having a permissions issue with your IDE. '

'Please try going to '

'System Settings -> Privacy & Security -> Local Network -> '

'[Find your IDE] -> Toggle ON, then restart your phone.')

throwsToolExit(

message:

'You might be having a permissions issue with your IDE. '

'Please try going to '

'System Settings -> Privacy & Security -> Local Network -> '

'[Find your IDE] -> Toggle ON, then restart your phone.',

),

i believe u

loic-sharma

Looks good!

…own during mdns discovery (flutter/flutter#157638)

Manual roll requested by tarrinneal@google.com flutter/flutter@fe71cad...0fe6153 2024-10-31 engine-flutter-autoroll@skia.org Roll Flutter Engine from c40b0b602822 to f2154ef3e31c (8 revisions) (flutter/flutter#157926) 2024-10-31 47866232+chunhtai@users.noreply.github.com Hides added routes before top-most route finishes pushing (flutter/flutter#156104) 2024-10-31 26356162+BenjiFarquhar@users.noreply.github.com Fix cursor on hover expand/collapse icon (#155207) (flutter/flutter#155209) 2024-10-31 32538273+ValentinVignal@users.noreply.github.com Add test for `media_query_data.system_gesture_insets.0.dart` (flutter/flutter#157854) 2024-10-31 matanlurey@users.noreply.github.com Add and plumb `useImplicitPubspecResolution` across `flutter_tools`. (flutter/flutter#157879) 2024-10-31 engine-flutter-autoroll@skia.org Roll Flutter Engine from 090c33aeae83 to c40b0b602822 (1 revision) (flutter/flutter#157896) 2024-10-31 engine-flutter-autoroll@skia.org Roll Flutter Engine from 9295eeb6d3ce to 090c33aeae83 (4 revisions) (flutter/flutter#157893) 2024-10-30 engine-flutter-autoroll@skia.org Roll Flutter Engine from 2bd854e23b61 to 9295eeb6d3ce (5 revisions) (flutter/flutter#157882) 2024-10-30 louisehsu@google.com Adds a new helpful tool exit message for SocketExceptions thrown during mdns discovery (flutter/flutter#157638) 2024-10-30 miechoo@users.noreply.github.com Fix `GlowingOverscrollIndicator` examples (flutter/flutter#155203) 2024-10-30 engine-flutter-autoroll@skia.org Roll Flutter Engine from 906a7ad88052 to 2bd854e23b61 (1 revision) (flutter/flutter#157878) 2024-10-30 34871572+gmackall@users.noreply.github.com Upgrade templates to AGP 8.7/Gradle 8.10.2 (flutter/flutter#157872) 2024-10-30 engine-flutter-autoroll@skia.org Roll Flutter Engine from 57ed5d338e7e to 906a7ad88052 (13 revisions) (flutter/flutter#157875) 2024-10-30 tessertaha@gmail.com Update Material 3 `LinearProgressIndicator` for new visual style (flutter/flutter#154817) 2024-10-30 engine-flutter-autoroll@skia.org Roll Flutter Engine from 999797a2f690 to 57ed5d338e7e (5 revisions) (flutter/flutter#157833) 2024-10-30 matanlurey@users.noreply.github.com Add hidden `--no-implicit-pubspec-resolution` flag for one stable release. (flutter/flutter#157635) 2024-10-30 engine-flutter-autoroll@skia.org Roll Packages from 028027e to 7cc1caa (5 revisions) (flutter/flutter#157864) 2024-10-30 stuartmorgan@google.com Mention partial PRs in the contributing docs (flutter/flutter#157863) If this roll has caused a breakage, revert this CL and stop the roller using the controls here: https://autoroll.skia.org/r/flutter-packages Please CC stuartmorgan@google.com,tarrinneal@google.com on the revert to ensure that a human is aware of the problem. To file a bug in Packages: https://github.com/flutter/flutter/issues/new/choose To report a problem with the AutoRoller itself, please file a bug: https://issues.skia.org/issues/new?component=1389291&template=1850622 Documentation for the AutoRoller is here: https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

…ng mdns discovery (flutter#157638) Addresses flutter#150131, but doesn't fix it, as there seem to be cases where the steps included in the messages added in this PR don't work.

### Background macOS Sequoia requires the user's permission to do multicast operations, which the Flutter tool does to connect to the Dart VM. If the app does not have permission to communicate with devices on the local network, the following happens: 1. Flutter tool starts a [multicast lookup](https://github.com/flutter/flutter/blob/bb2d34126cc8161dbe4a1bf23c925e48b732f670/packages/flutter_tools/lib/src/mdns_discovery.dart#L238-L241) 2. The mDNS client [sends data on the socket](https://github.com/flutter/packages/blob/973e8b59e24ba80d3c36a2bcfa914fcfd5e19943/packages/multicast_dns/lib/multicast_dns.dart#L219) 4. macOS blocks the operation. Dart's native socket implementation throws an `OSError` 5. Dart's `Socket.send` [catches the `OSError`](https://github.com/dart-lang/sdk/blob/da6dc03a15822d83d9180bd766c02d11aacdc06b/sdk/lib/_internal/vm/bin/socket_patch.dart#L1511-L1515), wraps it in a `SocketException`, and [schedules a microtask](https://github.com/dart-lang/sdk/blob/da6dc03a15822d83d9180bd766c02d11aacdc06b/sdk/lib/_internal/vm/bin/socket_patch.dart#L1513) that [reports the exception through the socket's stream](https://github.com/dart-lang/sdk/blob/95f00522676dff03f64fc715cb1835ad451faa4c/sdk/lib/_internal/vm/bin/socket_patch.dart#L3011) ([`Socket` is a `Stream`](https://api.dart.dev/dart-io/Socket-class.html)) 6. The mDNS client [does not listen to the socket stream's errors](https://github.com/flutter/packages/blob/973e8b59e24ba80d3c36a2bcfa914fcfd5e19943/packages/multicast_dns/lib/multicast_dns.dart#L155), so [the error is sent to the current `Zone`'s uncaught error handler](https://github.com/dart-lang/sdk/blob/95f00522676dff03f64fc715cb1835ad451faa4c/sdk/lib/async/stream_impl.dart#L553). ### Reproduction To reproduce this error on macOS... 1. Open System Settings > Privacy & Security > Local Network and toggle off Visual Studio Code 2. Run a Flutter app using a physical device ### Fix Ideally, we'd make `MDnsClient.lookup` throw an exception for this scenario. Unfortunately, the `MDnsClient` can have multiple lookup operations in parallel, and the `SocketException` doesn't give us enough information to match it back to a pending `MDnsClient` request. See flutter/packages#8450 as an attempt to solve this in the `MDnsClient` layer. Instead, this fix introduces a `Zone` in the tool to catch the socket's uncaught exception. Follow-up to #157638 See: #150131 ## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [x] I signed the [CLA]. - [x] I listed at least one issue that this PR fixes in the description above. - [x] I updated/added relevant documentation (doc comments with `///`). - [x] I added new tests to check the change I am making, or this PR is [test-exempt]. - [x] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [x] All existing and new tests are passing. If you need help, consider asking for advice on the #hackers-new channel on [Discord].  [Contributor Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview [Tree Hygiene]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md [test-exempt]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests [Flutter Style Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md [Features we expect every widget to implement]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement [CLA]: https://cla.developers.google.com/ [flutter/tests]: https://github.com/flutter/tests [breaking change policy]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes [Discord]: https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md [Data Driven Fixes]: https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md

) ### Background macOS Sequoia requires the user's permission to do multicast operations, which the Flutter tool does to connect to the Dart VM. If the app does not have permission to communicate with devices on the local network, the following happens: 1. Flutter tool starts a [multicast lookup](https://github.com/flutter/flutter/blob/bb2d34126cc8161dbe4a1bf23c925e48b732f670/packages/flutter_tools/lib/src/mdns_discovery.dart#L238-L241) 2. The mDNS client [sends data on the socket](https://github.com/flutter/packages/blob/973e8b59e24ba80d3c36a2bcfa914fcfd5e19943/packages/multicast_dns/lib/multicast_dns.dart#L219) 4. macOS blocks the operation. Dart's native socket implementation throws an `OSError` 5. Dart's `Socket.send` [catches the `OSError`](https://github.com/dart-lang/sdk/blob/da6dc03a15822d83d9180bd766c02d11aacdc06b/sdk/lib/_internal/vm/bin/socket_patch.dart#L1511-L1515), wraps it in a `SocketException`, and [schedules a microtask](https://github.com/dart-lang/sdk/blob/da6dc03a15822d83d9180bd766c02d11aacdc06b/sdk/lib/_internal/vm/bin/socket_patch.dart#L1513) that [reports the exception through the socket's stream](https://github.com/dart-lang/sdk/blob/95f00522676dff03f64fc715cb1835ad451faa4c/sdk/lib/_internal/vm/bin/socket_patch.dart#L3011) ([`Socket` is a `Stream`](https://api.dart.dev/dart-io/Socket-class.html)) 6. The mDNS client [does not listen to the socket stream's errors](https://github.com/flutter/packages/blob/973e8b59e24ba80d3c36a2bcfa914fcfd5e19943/packages/multicast_dns/lib/multicast_dns.dart#L155), so [the error is sent to the current `Zone`'s uncaught error handler](https://github.com/dart-lang/sdk/blob/95f00522676dff03f64fc715cb1835ad451faa4c/sdk/lib/async/stream_impl.dart#L553). ### Reproduction To reproduce this error on macOS... 1. Open System Settings > Privacy & Security > Local Network and toggle off Visual Studio Code 2. Run a Flutter app using a physical device ### Fix Ideally, we'd make `MDnsClient.lookup` throw an exception for this scenario. Unfortunately, the `MDnsClient` can have multiple lookup operations in parallel, and the `SocketException` doesn't give us enough information to match it back to a pending `MDnsClient` request. See flutter/packages#8450 as an attempt to solve this in the `MDnsClient` layer. Instead, this fix introduces a `Zone` in the tool to catch the socket's uncaught exception. Follow-up to flutter#157638 See: flutter#150131 ## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [x] I signed the [CLA]. - [x] I listed at least one issue that this PR fixes in the description above. - [x] I updated/added relevant documentation (doc comments with `///`). - [x] I added new tests to check the change I am making, or this PR is [test-exempt]. - [x] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [x] All existing and new tests are passing. If you need help, consider asking for advice on the #hackers-new channel on [Discord].  [Contributor Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview [Tree Hygiene]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md [test-exempt]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests [Flutter Style Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md [Features we expect every widget to implement]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement [CLA]: https://cla.developers.google.com/ [flutter/tests]: https://github.com/flutter/tests [breaking change policy]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes [Discord]: https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md [Data Driven Fixes]: https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md

…own during mdns discovery (flutter/flutter#157638)

LouiseHsu added 2 commits October 24, 2024 21:35

boop socket exceptions

d4b735b

typo!

d4cf9ad

github-actions bot added the tool Affects the "flutter" command-line tool. See also t: labels. label Oct 25, 2024

Merge branch 'master' into socket-exception-warning

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LouiseHsu changed the title ~~Socket exception warning~~ Adds a new helpful tool exit message for SocketExceptions thrown during mdns discovery Oct 25, 2024

lint

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LouiseHsu requested a review from jmagman October 25, 2024 23:25

LouiseHsu marked this pull request as ready for review October 25, 2024 23:25

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LouiseHsu added 3 commits October 29, 2024 12:53

surface error and trace msgs

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mac only.

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typo

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pr comments

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globals import lol

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globals?

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test justification

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.

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bonk

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LouiseHsu added the autosubmit Merge PR when tree becomes green via auto submit App label Oct 30, 2024

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Roll Flutter from fe71cadf1959 to 16622e67a051 (15 revisions) flutter/packages#7971

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…own during mdns discovery (flutter/flutter#157638)

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Roll Flutter from fe71cadf1959 to b01558c1cd70 (16 revisions) flutter/packages#7972

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jmagman mentioned this pull request Jan 15, 2025

On macOS Sequoia - [tool_crash] SocketException: Send failed, OS Error: No route to host, errno = 65 #150131

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Show error on macOS if missing Local Network permissions #161846

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…own during mdns discovery (flutter/flutter#157638)

Adds a new helpful tool exit message for SocketExceptions thrown during mdns discovery #157638

Adds a new helpful tool exit message for SocketExceptions thrown during mdns discovery #157638

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LouiseHsu commented Oct 25, 2024 •

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