HostFactoryResolver - Increase default timeout to thirty seconds

[maryamariyan]

Customer Impact

When customer has debugger attached or when using tools like EF, host startup path using WebApplicationBuilder for hosting and WebApplicationFactory for testing, may fail to build and throw an InvalidOperationException with the message “Unable to build IHost.”, because the default timeout is only 5 seconds.

We are proposing to use a higher timeout (1 minute) to be used so that when an application is taking longer to build, we could allow startup code to complete, and the host can start successfully.

Increasing the timeout should not have a negative impact on experience.

TODO

• Add test for this scenario to ensure it works.
• Add environment variable
• improve exception message

Risk

Very low.

Regression

No, new 6.0 feature/code flow for discovering a host.
Even though this is not a regression (uses WebApplicationBuilder which is new), but since this code is in the ASP.NET Core templates, it regresses the scenario when using default templates.

Fixes#60891, dotnet/aspnetcore#33886

[ghost]

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Issue Details

---

• Add test

Author:	maryamariyan
Assignees:	maryamariyan
Labels:	area-Extensions-Hosting
Milestone:	-

[halter73]

Assuming we improve the error message to make it clear that there was a timeout, are we worried that people will just kill the migration before seeing the error if we make this a full minute?

[maryamariyan]

updates exception messaging and changed it to 30 seconds, assuming we would keep the environment variable option.

[eerhardt]

LGTM

[davidfowl]

How did we land on 30 seconds? Just FYI, the reason the keyvault configuration provider tends to be the one that times out is because it makes an HTTP request per key, value pair to get the initial set of configuration values. The default should be like 5 minutes to just cover those scenarios.

[maryamariyan]

How did we land on 30 seconds?

My thought was, since we are allowing to accept environment variables then it's fair to reduce to 30 seconds. Also because of @halter73 's comment below:

are we worried that people will just kill the migration before seeing the error if we make this a full minute?

[davidfowl]

It should be more than 30 seconds because of the keyvault scenario (if you want some concrete data, look for keyvault configuration provider issues). My vote is 5 minutes