Moor: Infinite loop on build_runner build

[apoleo88]

I updated flutter at the last version, but now when I try to rebuild:
flutter packages pub run build_runner build

I get an infinite loop:

...
[INFO] 31m 49s elapsed, 1/17 actions completed.
[INFO] 31m 50s elapsed, 1/17 actions completed.
[INFO] 31m 51s elapsed, 1/17 actions completed.
[INFO] 31m 53s elapsed, 1/17 actions completed.
[INFO] 31m 54s elapsed, 1/17 actions completed.
[WARNING] No actions completed for 15.0s, waiting on:
  - moor_generator:moor_generator on lib/clock_fun.dart
  - moor_generator:moor_generator on lib/external/custom_icons.dart
  - moor_generator:moor_generator on lib/fun.dart
  - moor_generator:moor_generator on lib/globals.dart
  - moor_generator:moor_generator on lib/history_tab.dart
  .. and 11 more
...

I tried the commands flutter clean and then -> Packages get

[simolus3]

Thanks for the report, can you try to run the build with --verbose and see if there's anything suspicious in the output?

[apoleo88]

C:\flutter\bin\flutter packages pub run build_runner build --delete-conflicting-outputs --verbose

it gives me some early errors about non-nullable, that I guess are not correlated:

Bad state: Unexpected diagnostics:
C:\flutter\bin\cache\dart-sdk\lib\internal\internal.dart:172:16 - This requires the 'non-nullable' language feature to be enabled.

then it goes in the loop:

...
[INFO] Heartbeat:2m 12s elapsed, 1/17 actions completed.
[INFO] Heartbeat:2m 13s elapsed, 1/17 actions completed.
[INFO] Heartbeat:2m 14s elapsed, 1/17 actions completed.
[INFO] Heartbeat:2m 15s elapsed, 1/17 actions completed.
[WARNING] Heartbeat:
No actions completed for 15.1s, waiting on:
  - moor_generator:moor_generator on test/widget_test.dart
  - moor_generator:moor_generator on lib/choose_icon.dart
  - moor_generator:moor_generator on lib/db/db_classes.dart
  - moor_generator:moor_generator on lib/external/custom_icons.dart
  - moor_generator:moor_generator on lib/fun.dart
  .. and 11 more

[simolus3]

Interesting. Which Flutter channel and version are you using?

[apoleo88]

flutter master channel
version 1.19.0-0.0.pre

Right now I downgraded back to the previous one: 1.18.0-13.0.pre and it works fine (it gives me the DaoGenerator error 3-4 times, but at least I can build)

[js94766524]

Any good news? I also meet this problem
[√] Flutter: is fully installed. (Channel master, 1.19.0-1.0.pre.26, on Microsoft Windows [Version 10.0.18362.778], locale zh-CN) [√] Android toolchain - develop for Android devices: is fully installed. (Android SDK version 28.0.3) [√] Visual Studio - develop for Windows: is fully installed. (Visual Studio Community 2019 16.3.5) [√] Android Studio: is fully installed. (version 3.6) [√] IntelliJ IDEA Community Edition: is fully installed. (version 2019.2) [√] VS Code: is fully installed. (version 1.40.1) [√] Connected device: is fully installed. (1 available)

[simolus3]

(it gives me the DaoGenerator error 3-4 times, but at least I can build)

It would be interesting to see which error is happening here so I can fix it.

So far I couldn't reproduce this behavior locally. If you can share a small repro where this happens, I'd love to take a look.

[apoleo88]

(it gives me the DaoGenerator error 3-4 times, but at least I can build)

It would be interesting to see which error is happening here so I can fix it.

I am talking about a different issue, this: https://github.com/simolus3/moor/issues/452

[simolus3]

It strongly looks like this is an issue with the Dart analyzer and how it's integrated into the build system (see this and the following messages). It got broken by a recent SDK change that's reflected in the master channel of Flutter.

I'll close the issue since it's not a moor bug. If you're affected by this, can you try to add the dependency override for build_resolvers as suggested and see if that works?

[anandsubbu007]

```[INFO] Running build...
[INFO] Generating SDK summary...
[SEVERE] moor_generator:moor_generator on lib/Auth&Http/Auth.dart:

Bad state: Unexpected diagnostics:
C:\Program Files\Flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:119:41 - This requires the 'non-nullable' language feature to be enabled.
C:\Program Files\Flutter\bin\cache\pkg\sky_engine\lib\ui\channel_buffers.dart:152:17 - This requires the 'non-nullable' language feature to be enabled.

I'm also facing same problem
when i tried first it is working fine. when i delete that generated file & create a new file it showing this error.
it is go on running 

[INFO] 2m 1s elapsed, 1/17 actions completed.
[WARNING] No actions completed for 15.1s, waiting on:

• moor_generator:moor_generator on lib/Auth&Http/EmailLogin.dart
• moor_generator:moor_generator on lib/Auth&Http/HttpExpectation.dart
• moor_generator:moor_generator on lib/generated_plugin_registrant.dart
• moor_generator:moor_generator on lib/main.dart
  .. and 11 more

[INFO] 2m 3s elapsed, 1/17 actions completed.
[INFO] 2m 4s elapsed, 1/17 actions completed.
[INFO] 2m 6s elapsed, 1/17 actions completed.
[INFO] 2m 7s elapsed, 1/17 actions completed.
[INFO] 2m 8s elapsed, 1/17 actions completed.
```

[simolus3]

This is still a build bug, it just surfaces in moor_generator. Moor can't do anything about this, as the NNBD migration in Dart & Flutter breaks the build analyzer.

Bad state: Unexpected diagnostics

This is https://github.com/dart-lang/build/issues/2731. Running flutter packages upgrade might fix this.

[wolframm]

I get the same errors with the latest flutter upgrade. It finds some "Bad state: Unexpected diagnostics" and then it is waiting on:

• json_serializable:json_serializable on lib/models/business.dart

If I remove the build-filter option, build_runner simply waits on ALL my dart files.

I ran "flutter clean". Nothing helps.

FLUTTER DOCTOR -V OUTPUT:

[✓] Flutter (Channel stable, 1.20.0, on Mac OS X 10.15.5 19F101, locale en-US)
• Flutter version 1.20.0 at /Users/arne/flutter
• Framework revision 840c9205b3 (14 hours ago), 2020-08-04 20:55:12 -0700
• Engine revision c8e3b94853
• Dart version 2.9.0

[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
• Android SDK at /Users/arne/Library/Android/sdk
• Platform android-29, build-tools 29.0.3
• Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)
• All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 11.6)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 11.6, Build version 11E708
• CocoaPods version 1.9.1

[✓] Android Studio (version 4.0)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin version 47.1.2
• Dart plugin version 193.7361
• Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)

COMMAND LINE OUTPUT:

arne@MacBook-Pro-Arne consumer % flutter pub run build_runner build --build-filter '/Users/arne/rebait/consumer/lib/models/*'
[INFO] Generating build script...
[INFO] Generating build script completed, took 343ms

[INFO] Initializing inputs
[INFO] Reading cached asset graph...
[INFO] Reading cached asset graph completed, took 51ms

[INFO] Checking for updates since last build...
[INFO] Checking for updates since last build completed, took 450ms

[INFO] Running build...
[INFO] Generating SDK summary...
[SEVERE] json_serializable:json_serializable on lib/models/theme.dart:

Bad state: Unexpected diagnostics:
/Users/arne/flutter/bin/cache/pkg/sky_engine/lib/ui/channel_buffers.dart:119:41 - This requires the 'non-nullable' language feature to be enabled.
/Users/arne/flutter/bin/cache/pkg/sky_engine/lib/ui/channel_buffers.dart:152:17 - This requires the 'non-nullable' language feature to be enabled.
/Users/arne/flutter/bin/cache/pkg/sky_engine/lib/ui/channel_buffers.dart:88:62 - This requires the 'non-nullable' language feature to be enabled.
/Users/arne/flutter/bin/cache/pkg/sky_engine/lib/ui/channel_buffers.dart:153:38 - This requires the 'non-nullable' language feature to be enabled.
/Users/arne/flutter/bin/cache/pkg/sky_engine/lib/ui/channel_buffers.dart:186:51 - This requires the 'non-nullable' language feature to be enabled.
/Users/arne/flutter/bin/cache/pkg/sky_engine/lib/ui/channel_buffers.dart:133:32 - This requires the 'non-nullable' language feature to be enabled.
/Users/arne/flutter/bin/cache/pkg/sky_engine/lib/ui/channel_buffers.dart:154:25 - This requires the 'non-nullable' language feature to be enabled.
/Users/arne/flutter/bin/cache/pkg/sky_engine/lib/ui/channel_buffers.dart:18:17 - This requires the 'non-nullable' language feature to be enabled.
/Users/arne/flutter/bin/cache/pkg/sky_engine/lib/ui/channel_buffers.dart:64:4 - This requires the 'non-nullable' language feature to be enabled.
/Users/arne/flutter/bin/cache/pkg/sky_engine/lib/ui/channel_buffers.dart:168:32 - This requires the 'non-nullable' language feature to be enabled.
/Users/arne/flutter/bin/cache/pkg/sky_engine/lib/ui/channel_buffers.dart:47:14 - This requires the 'non-nullable' language feature to be enabled.
/Users/arne/flutter/bin/cache/pkg/sky_engine/lib/ui/channel_buffers.dart:159:38 - This requires the 'non-nullable' language feature to be enabled.
/Users/arne/flutter/bin/cache/pkg/sky_engine/lib/ui/channel_buffers.dart:132:37 - This requires the 'non-nullable' language feature to be enabled.
/Users/arne/flutter/bin/cache/pkg/sky_engine/lib/ui/channel_buffers.dart:118:48 - This requires the 'non-nullable' language feature to be enabled.
/Users/arne/flutter/bin/cache/pkg/sky_engine/lib/ui/channel_buffers.dart:19:11 - This requires the 'non-nullable' language feature to be enabled.
[SEVERE] json_serializable:json_serializable on lib/models/theme.dart:

Bad state: Unexpected diagnostics:
/Users/arne/flutter/bin/cache/pkg/sky_engine/lib/ui/channel_buffers.dart:119:41 - This requires the 'non-nullable' language feature to be enabled.
/Users/arne/flutter/bin/cache/pkg/sky_engine/lib/ui/channel_buffers.dart:152:17 - This requires the 'non-nullable' language feature to be enabled.
/Users/arne/flutter/bin/cache/pkg/sky_engine/lib/ui/channel_buffers.dart:88:62 - This requires the 'non-nullable' language feature to be enabled.
/Users/arne/flutter/bin/cache/pkg/sky_engine/lib/ui/channel_buffers.dart:153:38 - This requires the 'non-nullable' language feature to be enabled.
/Users/arne/flutter/bin/cache/pkg/sky_engine/lib/ui/channel_buffers.dart:186:51 - This requires the 'non-nullable' language feature to be enabled.
/Users/arne/flutter/bin/cache/pkg/sky_engine/lib/ui/channel_buffers.dart:133:32 - This requires the 'non-nullable' language feature to be enabled.
/Users/arne/flutter/bin/cache/pkg/sky_engine/lib/ui/channel_buffers.dart:154:25 - This requires the 'non-nullable' language feature to be enabled.
/Users/arne/flutter/bin/cache/pkg/sky_engine/lib/ui/channel_buffers.dart:18:17 - This requires the 'non-nullable' language feature to be enabled.
/Users/arne/flutter/bin/cache/pkg/sky_engine/lib/ui/channel_buffers.dart:64:4 - This requires the 'non-nullable' language feature to be enabled.
/Users/arne/flutter/bin/cache/pkg/sky_engine/lib/ui/channel_buffers.dart:168:32 - This requires the 'non-nullable' language feature to be enabled.
/Users/arne/flutter/bin/cache/pkg/sky_engine/lib/ui/channel_buffers.dart:47:14 - This requires the 'non-nullable' language feature to be enabled.
/Users/arne/flutter/bin/cache/pkg/sky_engine/lib/ui/channel_buffers.dart:159:38 - This requires the 'non-nullable' language feature to be enabled.
/Users/arne/flutter/bin/cache/pkg/sky_engine/lib/ui/channel_buffers.dart:132:37 - This requires the 'non-nullable' language feature to be enabled.
/Users/arne/flutter/bin/cache/pkg/sky_engine/lib/ui/channel_buffers.dart:118:48 - This requires the 'non-nullable' language feature to be enabled.
/Users/arne/flutter/bin/cache/pkg/sky_engine/lib/ui/channel_buffers.dart:19:11 - This requires the 'non-nullable' language feature to be enabled.
[INFO] 2.1s elapsed, 1/2 actions completed.
[INFO] 3.2s elapsed, 1/2 actions completed.
[INFO] 4.3s elapsed, 1/2 actions completed.
[INFO] 5.4s elapsed, 1/2 actions completed.
[INFO] 6.5s elapsed, 1/2 actions completed.
[INFO] 7.6s elapsed, 1/2 actions completed.
[INFO] 8.7s elapsed, 1/2 actions completed.
[INFO] 9.8s elapsed, 1/2 actions completed.
[INFO] 10.9s elapsed, 1/2 actions completed.
[INFO] 11.9s elapsed, 1/2 actions completed.
[INFO] 13.0s elapsed, 1/2 actions completed.
[INFO] 14.1s elapsed, 1/2 actions completed.
[INFO] 15.2s elapsed, 1/2 actions completed.
[WARNING] No actions completed for 15.0s, waiting on:

• json_serializable:json_serializable on lib/models/business.dart

[INFO] 17.2s elapsed, 1/2 actions completed.
[INFO] 18.2s elapsed, 1/2 actions completed.

[simolus3]

@wolframm Does flutter package upgrade really not fix this for you? You could also try to add a dev_dependency on build_resolvers: ^1.3.10 to enforce a compatible version.

[wolframm]

I found a workaround as per https://github.com/flutter/flutter/issues/62240

Hopefully they will fix the latest version of Dart analyzer.

[pavan-jaju]

I was getting the same issue, but as I observed that is says "waiting on file", I just tried to close all the open files, and eventually after that this loop problems got resolved, started working automatically.

[martianvenusian]

This is still a build bug, it just surfaces in moor_generator. Moor can't do anything about this, as the NNBD migration in Dart & Flutter breaks the build analyzer.

Bad state: Unexpected diagnostics

This is dart-lang/build#2731. Running flutter packages upgrade might fix this.

It really helped me. After trying flutter clean, flutter pub get I tried flutter packages upgrade

[CabralPro]

I had the same problem, what happened in my case was that my files were capitalized for example: "MyStoreBank.dart", what I did was change to the lower name "my_store_bank.dart" ... doing this the loop stopped and the .g file was created when I ran "flutter pub run build_runner build"

[pavan-jaju]

what worked for me is, I just closed all open files, and the infinite loop
automatically started working.

Warm Regards

Pavan Jaju
Proprietor,
Dreambolix
W: www.dreambolix.com
http://www.Dreambolix.com
E: [email protected] | [email protected]
M: [phone]
Skype: pavanjaju

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On Wed, Aug 19, 2020 at 7:05 AM Arthur Cabral [e-mail]
wrote:

I had the same problem, what happened in my case was that my files were
capitalized for example: "MyStoreBank.dart", what I did was change to the
lower name "my_store_bank.dart" ... doing this the loop stopped and the .g
file was created when I ran "flutter pub run build_runner build"

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[apoleo88]

I solved this bug downgrading to moor_ffi: 0.5.0 and flutter 1.18.0-13.0.pre.
But after updating to flutter 1.20, I am back battling with this again.

Now I tried to update the dependencies to the new official ones:

dependencies:
  moor: # use the latest version
  sqlite3_flutter_libs: # Also use the latest version.
  path_provider:
  path:
dev_dependencies:
  moor_generator: # use the latest version
  build_runner:

At the start of the building I get also:

Bad state: Unexpected diagnostics:
C:\src\flutter\bin\cache\dart-sdk\lib\core\uri.dart:3259:39 - Expected an identifier.
[SEVERE] moor_generator:moor_generator on test/widget_test.dart:

Bad state: Unexpected diagnostics:

I tried with moor_flutter: ^3.1.0 and nothing.

To be honest, I am quite frustrated because every time there is a little change moor won't build at all.

[simolus3]

To be honest, I am quite frustrated because every time there is a little change moor won't build at all.

I can understand your frustration, but in this case it's not moor causing trouble. The unexpected diagnostics error comes from build_resolvers, the build system just runs them in the context of moor. You would get the same error with every other code generation package too.

Looking at https://github.com/dart-lang/build/issues/2763, it looks like temporarily adding analyzer: 0.39.14 and running flutter packages upgrade should fix this problem.

If you use package:moor/ffi.dart, you don't need to depend on moor_flutter by the way.

[cassioseffrin]

This is still a build bug, it just surfaces in moor_generator. Moor can't do anything about this, as the NNBD migration in Dart & Flutter breaks the build analyzer.

Bad state: Unexpected diagnostics

This is dart-lang/build#2731. Running flutter packages upgrade might fix this.

That also works for me using flutter 1.22 and flutter floor

[MustafaHasria]

I'm also facing same problem
when i tried write this command "flutter pub run build_runner build" to generate the api_client.g.dart file it showing this error.
it is go on running

`[INFO] 17.7s elapsed, 1/5 actions completed.
[INFO] 18.8s elapsed, 1/5 actions completed.
[INFO] 19.8s elapsed, 1/5 actions completed.
[INFO] 20.9s elapsed, 1/5 actions completed.
[INFO] 22.0s elapsed, 1/5 actions completed.
[INFO] 23.0s elapsed, 1/5 actions completed.
[INFO] 24.1s elapsed, 1/5 actions completed.
[INFO] 25.2s elapsed, 1/5 actions completed.
[INFO] 26.2s elapsed, 1/5 actions completed.
[INFO] 27.3s elapsed, 1/5 actions completed.
[INFO] 28.4s elapsed, 1/5 actions completed.
[INFO] 29.4s elapsed, 1/5 actions completed.
[INFO] 30.5s elapsed, 1/5 actions completed.
[INFO] 31.6s elapsed, 1/5 actions completed.
[WARNING] No actions completed for 15.0s, waiting on:

• built_value_generator:built_value on lib/repository/model/data.dart
• built_value_generator:built_value on lib/main.dart
• built_value_generator:built_value on lib/repository/model/User.dart
• built_value_generator:built_value on lib/repository/retrofit/api_client.dart
  `

[simolus3]

@MustafaHasria In your case it looks like built_value_generator (that's from built_value and unrelated to moor) is causing the delay. Either way, can you check that you're using the latest version of build_runner (you don't necessarily need 1.12, but 1.11.x would be good).