Add more TlsProvider implementations

[ikhoon]

It would be useful to automatically/dynamically update TlsKeyPair when the value of a storage changes such as:

• Environment variables
• File system
• Configuration files on the Central Dogma
• DBMS, NoSQL
• ...

[yzfeng2020]

I am also interested in this feature, specifically the File system, do you have a rough idea how to implement that? my idea is to poll/watch the file content from time to time and check if it has changed, wondering if there's a better way.

Another question is when the new TlsKeyPair will take effect? my read of the code is that when a new connection pool is created, the ssl context can be created with the tls key pair. so it's the new pool of connections instead of new connection alone?

thanks!

[ikhoon]

my idea is to poll/watch the file content from time to time and check if it has changed, wondering if there's a better way.

My idea was also the same.

Another question is when the new TlsKeyPair will take effect?

The new TlsKeyPair will be used when a new connection is created. It is not working at a connection pool level. A HttpChannelPool could use SslContext made from the new TlsKeyPair.

armeria/core/src/main/java/com/linecorp/armeria/client/HttpChannelPool.java

Line 391 in 41c3f2b

bootstrap = bootstraps.getOrCreate(remoteAddress, desiredProtocol, serializationFormat);