Cargo project manager retry 500 errors.

[gregorymacharia]

While investigating a spike of Cargo 500s, Terrapin has seen that periodically Cargo registry returns 500 error responses and OSS Gadget does not retry such requests. This change adds a retry mechanism for operations in Cargo project manager and accompanying unit tests for the changes.

[pmalmsten]

@gregorymacharia If you haven't linked your GitHub account with Microsoft, there are some reasons why you might want to consider it: https://docs.opensource.microsoft.com/contributing/microsoft-projects/#contributing-with-linked-vs-unlinked-accounts

[gregorymacharia]

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[gfs]

Polly is already used as a dependency to handle retry logic in other places. I think it would make sense to leverage that here, I'm noticing a fair bit of repeated logic and similar local variables. Alternately, you could make a helper function that does the retrying with a lambda for the action taken to reduce the duplication.

A location where polly used now for example:

OSSGadget/src/Shared/PackageManagers/TypedManager.cs

Lines 117 to 122 in 7d9fada

	public async Task<bool> UriExistsAsync(Uri artifactUri, AsyncRetryPolicy<HttpResponseMessage>? policy = null)
	{
	policy ??= DefaultPolicy;
	return (await policy.ExecuteAsync(() => CreateHttpClient().GetAsync(artifactUri, HttpCompletionOption.ResponseHeadersRead))).StatusCode == HttpStatusCode.OK;
	}

[gregorymacharia]

Polly is already used as a dependency to handle retry logic in other places. I think it would make sense to leverage that here, I'm noticing a fair bit of repeated logic and similar local variables. Alternately, you could make a helper function that does the retrying with a lambda for the action taken to reduce the duplication.

A location where polly used now for example:

OSSGadget/src/Shared/PackageManagers/TypedManager.cs

Lines 117 to 122 in 7d9fada

	public async Task<bool> UriExistsAsync(Uri artifactUri, AsyncRetryPolicy<HttpResponseMessage>? policy = null)
	{
	policy ??= DefaultPolicy;
	return (await policy.ExecuteAsync(() => CreateHttpClient().GetAsync(artifactUri, HttpCompletionOption.ResponseHeadersRead))).StatusCode == HttpStatusCode.OK;
	}

I have gone ahead and switched to polly for handling the retries. Let me know if you have further feedback thanks.

[gfs]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[gfs]

LGTM.