Add refresh_events to CertHandler
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PietroPasotti
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overall looks good, missing a little bit of comments/docstrings and ideally a test that demonstrates how a new csr is requested when you receive a refresh event and, say, your privkey has changed, and a new csr is NOT requested when all of the input params are unchanged.
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This PR adds a
refresh_eventsoption toCertHandlerwhich will be observed to check if there are any changes to the CSR (e.g: newly added SANs). And if there are changes from the existing CSR, it will be replaced by a new one generated with the newest request details and subsequently provide a new certificate.Context
In HA clusters, the coordinator currently requests a certificate with its own hostname given as a SAN. However, this certificate is passed on to the workers to be used by them. This leads to issues when services (e.g pebble check on the worker) tries to communicate with the worker server directly, they will get a certificate error saying that the certificate is valid for the coordinator not the worker.
This solution gives the option to the coordinator to specify the workers' hostnames as SANS whenever a worker is added or removed by, for example, giving
refresh_events=[self.cluster.on.changed]to check if the certificate needs to be refreshed.