✨ Export HTTP server manager runnable implementation #2473
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pkg/manager/server.go
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| // among multiple servers. | ||
| Kind string | ||
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| // Log is the logger used by the server. If not set, a logger will be derived from the context passed to Start. |
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Why not only have one way to pass it in?
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I didn't want to require a Server struct to be setup with a logger in advance. I don't have a strong opinion here though.
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Could we remove the Log here, and just inherit the logger from Start?
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This was already present in the unexported server struct, so I wasn't going to change it.
There is existing code in the pprof and health probe server setup that explicitly sets the servers' logger to the controller manager's logger (which comes from manager.Options.Logger).
There's a bunch of context plumbing that makes it difficult to tell which contexts are used where, but I can't find anywhere that injects the controllerManager's logger into the context that is used to start the http servers.
We could potentially make a custom context with the logger injected and use that context just with the HTTPServers group to preserve existing behavior.
WDYT?
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| // NeedLeaderElection returns true if the server should only be started when the manager is the leader. | ||
| func (s *Server) NeedLeaderElection() bool { | ||
| return s.OnlyServeWhenLeader | ||
| } |
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The use case I have in mind is when there is a strong coupling between what is being reconciled and what is being served. One example might be an API that represents OCI images, where creating an instance of that API makes the OCI image contents available as a tar archive via the HTTP server.
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…able Signed-off-by: Joe Lanford <joe.lanford@gmail.com>
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/lgtm Will fix the nit in a follow up |
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LGTM label has been added. Git tree hash: 5e942e32c0322a50d35fbf4b19a3e60ef8e056b3
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In operator-framework, we have run into a few situations where we need to run a custom HTTP server inside a controller process. In order to decouple from assumptions made by the metrics server (which allows extra handlers to be added), we need a fully separate server. Since controller-runtime already has a generic HTTP server runnable for use with health probes and pprof handlers, it seems useful to export this implementation to users as well so that they can run their own HTTP servers without having to worry about implementing the
manager.Runnableinterface correctly.