Add support for passing per-message metadata.MD #220
Merged
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This adds support for per-message (client-side) metadata.MD to be passed in Gorums' Metadata object. This allows a client (or interceptor) to pass custom data to the server replicas. For example, a client can pass its client-id or request-id to the server, independent of the application-level message.
Note that this does not support canceling unary quorum calls etc. I've decided to defer adding support for cancellation until I understand it better.
Fixes #219
Fixes #172