:nxdomain when calling Goth.Token.for_scope/1

[yuchunc]

I have been trying to auth with Google with Goth.Token.for_scope/1, and would get this error:

** (MatchError) no match of right hand side value: {:error, %HTTPoison.Error{id: nil, reason: :nxdomain}}
    (goth) lib/goth/client.ex:64: Goth.Client.get_access_token/3
    (goth) lib/goth/token.ex:151: Goth.Token.retrieve_and_store!/2

Looking in to the code base, I found it is trying to call http://metadata.google.internal, hence the :nxdomain error. I feel I missed something during the setup, but can't figure it out. How should I understand this error?

Thanks

[yuchunc]

Hi, sorry to be a nuisance, but any direction on this would be super helpful!

Thank you!!

[peburrows]

Sorry, I somehow completely missed this initial issue report!

Goth should only be falling back to hitting that internal Google metadata host when it can't find any other configuration. Have you configured Goth to use your service account json credentials, most likely via something like this in a config file:

# via a variable that contains the json
config :goth, json: credentials_json

# or, via an ENV var
config :goth, json: {:system, "MY_GCP_CREDENTIALS"}

(There are other ways to pass in your credentials, but those are the two most common.)

[yuchunc]

@peburrows ahhh..... I think I had provided the wrong credential json. I deleted everything and started again last week, and "accidentally" provided the right cred json, and it works now. Do you think it might be useful to have warning messages in dev environment when some part of the cred is missing?

Thanks for being patient with my issues.

[vans163]

I think this is an error with how :inet_res works on newer erlang versions. 10.4.4 ERTS for example cannot parse a domain with a trailing /, but 10.2.2 ERTS can.