Allow passing path to keyfile to use for credentials

[sundewei]

@garrettjonesgoogle
Hi,
I was informed to create a ticket for Java from an existing ticket which was for Ruby:
googleapis/gapic-generator#1324

Currently I am trying to create a custom metric in Java but was not able to find out how to create the MetricServiceClient object from the json keyfile.

If you can provide me a Java example of doing it, that'd ok for now....many thanks

Dewei

Below is my code:
Line 1
CredentialsProvider credentialsProvider = FixedCredentialsProvider.create( ServiceAccountCredentials.fromStream(new FileInputStream(gcpJsonKeyFilePath)));
Line 2
final MetricServiceClient client = MetricServiceClient.create((MetricServiceSettings) MetricServiceSettings.newBuilder().setCredentialsProvider(credentialsProvider).build());

Here is the error message:

Exception in thread "main" java.lang.IllegalStateException: Missing required properties: totalTimeout initialRetryDelay retryDelayMultiplier maxRetryDelay initialRpcTimeout rpcTimeoutMultiplier maxRpcTimeout

[garrettjonesgoogle]

Use MetricServiceSettings.defaultBuilder() instead of MetricServiceSettings.newBuilder().

[sundewei]

Thanks a lot for the input, I tried your approach:

CredentialsProvider credentialsProvider = FixedCredentialsProvider.create( ServiceAccountCredentials.fromStream(new FileInputStream(gcpJsonKeyFilePath)));

final MetricServiceClient client = MetricServiceClient.create((MetricServiceSettings) MetricServiceSettings.defaultBuilder().setCredentialsProvider(credentialsProvider).build());

But now I got this error...any suggestion or code snippet is appreciated:
Exception in thread "main" java.io.IOException: The Application Default Credentials are not available. They are available if running in Google Compute Engine. Otherwise, the environment variable GOOGLE_APPLICATION_CREDENTIALS must be defined pointing to a file defining the credentials. See https://developers.google.com/accounts/docs/application-default-credentials for more information.

[garrettjonesgoogle]

Hmm that looks like it should work. @neozwu could you investigate?

[sundewei]

Just FYI, the example I listed above used this dependency:
<!-- https://mvnrepository.com/artifact/com.google.cloud/google-cloud-monitoring --> <dependency> <groupId>com.google.cloud</groupId> <artifactId>google-cloud-monitoring</artifactId> <version>0.19.0-alpha</version> </dependency>

[sundewei]

I have added more info to the code, it looks like the MetricServiceSettings' defaultBuilder does not get the CredentialsProvider after my setter call:

[neozwu]

@sundewei I can reproduce this error. This is due to a bug in version 0.19.0-alpha. We have a fix in our next release (through this PR, and the code change is here)

[sundewei]

Thanks a lot for checking it.

Please kindly let me know once you have the API which would take a keyfile InputStream like other GCP services, that's our preferred way of using it.

Dewei

[neozwu]

@sundewei the new release (0.20.0-alpha) is out. I'm closing this issue now but feel free to reopen it if you still have the same problem.