public void IsRunningOnComputeEngine_ResultIsCached()
{
// Two subsequent invocations should return the same task.
Assert.AreSame(ComputeCredential.IsRunningOnComputeEngine(),
ComputeCredential.IsRunningOnComputeEngine());
}
/// <summary>Creates a new default credential.</summary>
private async Task <GoogleCredential> CreateDefaultCredentialAsync()
{
// 1. First try the environment variable.
string credentialPath = GetEnvironmentVariable(CredentialEnvironmentVariable);
if (!String.IsNullOrWhiteSpace(credentialPath))
{
try
{
return(CreateDefaultCredentialFromFile(credentialPath));
}
catch (Exception e)
{
// Catching generic exception type because any corrupted file could manifest in different ways
// including but not limited to the System, System.IO or from the Newtonsoft.Json namespace.
throw new InvalidOperationException(
String.Format("Error reading credential file from location {0}: {1}"
+ "\nPlease check the value of the Environment Variable {2}",
credentialPath,
e.Message,
CredentialEnvironmentVariable), e);
}
}
// 2. Then try the well known file.
credentialPath = GetWellKnownCredentialFilePath();
if (!String.IsNullOrWhiteSpace(credentialPath))
{
try
{
return(CreateDefaultCredentialFromFile(credentialPath));
}
catch (FileNotFoundException)
{
// File is not present, eat the exception and move on to the next check.
Logger.Debug("Well-known credential file {0} not found.", credentialPath);
}
catch (DirectoryNotFoundException)
{
// Directory not present, eat the exception and move on to the next check.
Logger.Debug("Well-known credential file {0} not found.", credentialPath);
}
catch (Exception e)
{
throw new InvalidOperationException(
String.Format("Error reading credential file from location {0}: {1}"
+ "\nPlease rerun 'gcloud auth login' to regenerate credentials file.",
credentialPath,
e.Message), e);
}
}
// 3. Then try the compute engine.
Logger.Debug("Checking whether the application is running on ComputeEngine.");
if (await ComputeCredential.IsRunningOnComputeEngine().ConfigureAwait(false))
{
Logger.Debug("ComputeEngine check passed. Using ComputeEngine Credentials.");
return(new GoogleCredential(new ComputeCredential()));
}
// If everything we tried has failed, throw an exception.
throw new InvalidOperationException(
String.Format("The Application Default Credentials are not available. They are available if running"
+ " in Google Compute Engine. Otherwise, the environment variable {0} must be defined"
+ " pointing to a file defining the credentials. See {1} for more information.",
CredentialEnvironmentVariable,
HelpPermalink));
}
public void IsRunningOnComputeEngine()
{
// It should be safe to assume that this test is not running on GCE.
Assert.IsFalse(ComputeCredential.IsRunningOnComputeEngine().Result);
}