Dart support ?

[joe-getcouragenow]

GRPC is fully supported and dart, and i want to make grpc middleware in dart to use opentelemtry.

SO i was wondering if Dart would be possible to support.

I regularly code gen the golanf and dart code from a protobuf all the time and it works fine.

For example to gen chat.proto from a make file.

protoc-go:
	protoc -I grpc-web/pkg/proto grpc-web/pkg/proto/v2.proto --gofast_out=plugins=grpc:./grpc-web/pkg/api/v2

proto-dart:
	pub global activate protoc_plugin
	mkdir -p $(SAMPLE_FSPATH)/lib/api/v1/google/protobuf

ifeq ($(GO_OS), windows)
	@echo Windows detected
	protoc empty.proto timestamp.proto wrappers.proto --proto_path=$(LIB_FSPATH)/server/third_party/google/protobuf/ --plugin=$(HOME_PATH)/AppData/Roaming/Pub/Cache/bin/protoc-gen-dart.bat --dart_out=grpc:"$(PROTO_OUTPUT)/client/lib/chat_view/api/v1/google/protobuf"
	protoc chat.proto --proto_path=$(LIB_FSPATH)/server/api/proto/v1/ --plugin=$(HOME_PATH)/AppData/Roaming/Pub/Cache/bin/protoc-gen-dart.bat --dart_out=grpc:"$(PROTO_OUTPUT)/client/lib/chat_view/api/v1/"
else
	protoc empty.proto timestamp.proto wrappers.proto --proto_path=$(LIB_FSPATH)/server/third_party/google/protobuf --plugin=protoc-gen-dart=$(HOME)/.pub-cache/bin/protoc-gen-dart --dart_out=grpc:$(SAMPLE_FSPATH)/lib/api/v1/google/protobuf
	protoc chat.proto --proto_path=$(LIB_FSPATH)/server/api/proto/v1/ --plugin=protoc-gen-dart=$(HOME)/.pub-cache/bin/protoc-gen-dart --dart_out=grpc:$(SAMPLE_FSPATH)/client/lib/chat_view/api/v1/
endif

[tigrannajaryan]

Yes, that should work. What sort of Dart support do you expect from this repository? This repository merely contains proto file definitions which are language independent.

[ghenry]

I was just Googling this too.

[andrewhsu]

having a look at this issue in the spec issue triage mtg today, are we looking for an api/sdk for dart? if so, this issue should be moved to open-telemetry/community to track request.

[tigrannajaryan]

@open-telemetry/governance-committee I don't have permissions to transfer this to the open-telemetry/community repo, can you please do it?

[mtwo]

I'm on the GC and lack the permissions to move this issue. @SergeyKanzhelev @bhs are you able to move it? Not sure who has admin privileges in this repo.

[joe-getcouragenow]

Yes, that should work. What sort of Dart support do you expect from this repository? This repository merely contains proto file definitions which are language independent.

There are a ton of good and bad telemetry thingies for Flutter. https://pub.dev/packages?q=crashy

Just want to be able to use opentel from flutter / dart language because life is too short for another telemetry framework and i like to have options...

I am really surprised no one has done this actually yet.

things i would extend for are:

• flutter has first class grpc and protobuf support. so no show stoppers there.

• store and forward using hive. So offline client logs, metrics are eventually sent to the Collector.

• hive is a very fast kv store for dart that runs on web, native, everywhere ( https://github.com/hivedb/hive#benchmark ).

• Hive is designed to work with protobuf schema evolutions also :). The fields are numbered ( https://github.com/hivedb/hive/blob/master/hive/example/lib/main.g.dart#L20 ). I use gprc and hive together currently and can update my grpc protos, and still have the flutter app using the same grpc tick along fine. So schema evolution works well.

• Write adapters for opentel protobuf generated code, such that the offline support is automatically generated. Hive has type adapters that are code generated just like protobuf ( https://github.com/hivedb/hive/search?q=TypeAdapter ).

• make a Test harness that is crashy also ( https://github.com/flutter/crashy )

• add a crash handler to make it easy to use.

What have i missed ?? Would be curious to hear what the maintainers viewpoints are...

[austinlparker]

I think this would be a great idea - it seems like the actual work of an integration would be an exporter from hive that could batch and forward reports to a collector via OTLP, since dart/flutter can use the existing JS API/SDK? Might also need an adapter for hive that can accept OTLP from the SDK - I'm not super familiar with the ecosystem on that side, unfortunately. It seems like it wouldn't require that much work all told, presumably the biggest amount of effort would be seeing if the JS GRPC instrumentation worked out of the box with Dart?

[MateusAmin]

Yes, that should work. What sort of Dart support do you expect from this repository? This repository merely contains proto file definitions which are language independent.

There are a ton of good and bad telemetry thingies for Flutter. https://pub.dev/packages?q=crashy

Just want to be able to use opentel from flutter / dart language because life is too short for another telemetry framework and i like to have options...

I am really surprised no one has done this actually yet.

things i would extend for are:

* flutter has first class grpc and protobuf support. so no show stoppers there.

* store and forward using hive. So offline client logs, metrics are eventually sent to the Collector.

* hive is a very fast kv store for dart that runs on web, native, everywhere ( https://github.com/hivedb/hive#benchmark ).

* Hive is designed to work with protobuf schema evolutions also :). The fields are numbered ( https://github.com/hivedb/hive/blob/master/hive/example/lib/main.g.dart#L20 ). I use gprc and hive together currently and can update my grpc protos, and still have the flutter app using the same grpc tick along fine. So schema evolution works well.

* Write adapters for opentel protobuf generated code, such that the offline support is automatically generated. Hive has type adapters that are code generated just like protobuf ( https://github.com/hivedb/hive/search?q=TypeAdapter ).

* make a Test harness that is crashy also ( https://github.com/flutter/crashy )

* add a crash handler to make it easy to use.

What have i missed ?? Would be curious to hear what the maintainers viewpoints are...

Good plan.

I would be interested in this without offline support to keep things clean. Might start there then add offline support as a flag or separate package.

This might be the best project to fork:

https://github.com/getsentry/sentry-dart

[thundering-herd]

Hej,
I also got interested in instrumenting mobile applications written in Flutter. Are there any plans or ideas on how to accomplish this iva OpenTelemetry?

[agorges]

Hard to find, even with google:

https://github.com/Workiva/opentelemetry-dart.git

I have not checked it out yet.
Just in case someone landed here...

[kirinnee]

interested in this as well

[k-koleda]

Any updates on this please?