Flood of errors in console when running Datastore sample against local Datastore emulator

[MaxRossGoogle]

I followed the instructions for the Cloud Datastore getting started guide with Go:
https://cloud.google.com/datastore/docs/datastore-api-tutorial

Then I followed the instructions to run the local Datastore emulator:
https://cloud.google.com/datastore/docs/tools/datastore-emulator

Then I restarted my app:
go run tasks.go

The output looks like this (with the connection reset message just continuing indefinitely):
Cloud Datastore Task List

Usage:

new Adds a task with a description
done Marks a task as done
list Lists all tasks by creation time
delete Deletes a task

2016/04/04 21:56:30 transport: http2Client.notifyError got notified that the client transport was broken read tcp 127.0.0.1:51418->127.0.0.1:8687: read: connection reset by peer.
2016/04/04 21:56:30 transport: http2Client.notifyError got notified that the client transport was broken read tcp 127.0.0.1:51419->127.0.0.1:8687: read: connection reset by peer.
2016/04/04 21:56:30 transport: http2Client.notifyError got notified that the client transport was broken read tcp 127.0.0.1:51420->127.0.0.1:8687: read: connection reset by peer.

[MaxRossGoogle]

Forgot to mention:
This is on OS X 10.11.4

[broady]

I can't reproduce this, but I'm trying from Linux.

Are you using the latest version of the datastore emulator?

Also, there was a recent update to the google.golang.org/cloud/datastore package to use the new datastore/v1beta3 API.

Ensure you are fully up to date:
go get -u google.golang.org/cloud/datastore

[broady]

It sounds like the emulator isn't really running on that port. Does port 8687 match the output from gcloud beta emulators datastore start?

[MaxRossGoogle]

Thanks for the response.

I installed everything fresh last night, after the v1beta3 announcement. I believe the emulator is working correctly because I can go through the getting started guide for other languages and those apps connect successfully.

[broady]

OK, I can reproduce this on Mac OS. Will file a bug with the emulator team.

[broady]

Ah, I can also reproduce on Linux. I must have misconfigured my Linux box yesterday.

This is because the datastore emulator doesn't support gRPC yet.

[MaxRossGoogle]

That would certainly explain it. Can't the Go app connect via json/http rather than gRPC? Presumably that's what the Datastore samples for python, java, and node all do.

[broady]

It could, but this sample uses the google.golang.org/cloud/datastore library, which uses gRPC.

It wouldn't be worth changing the underlying transport. It'd be best to get the emulator working with gRPC!

It's strange that the emulator exposes the environment variables that are specifically for gRPC (DATASTORE_EMULATOR_HOST rather than DATASTORE_HOST, which was for HTTP/1.1)

[MaxRossGoogle]

I have no sense of how much work is involved here, but I bet @pcostell knows.

[broady]

Ah, yes. I followed up with Patrick. He's working on it.
On Apr 6, 2016 11:40 AM, "MaxRossGoogle" notifications@github.com wrote:

I have no sense of how much work is involved here, but I bet @pcostell
https://github.com/pcostell knows.

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#24 (comment)

[pcostell]

Hey all --

There is a gRPC emulator available!

It has the same command line options as the normal gcd.sh tool, but isn't yet built into the gcloud tool. For now it only works with v1beta3 over gRPC, which is why we can't just swap it in for the old emulator, which supports both v1beta2 and v1beta3, but only using proto-over-HTTP.