• Felix Lange's avatar
    rpc: implement full bi-directional communication (#18471) · 245f3146
    Felix Lange authored
    New APIs added:
    
        client.RegisterName(namespace, service) // makes service available to server
        client.Notify(ctx, method, args...)     // sends a notification
        ClientFromContext(ctx)                  // to get a client in handler method
    
    This is essentially a rewrite of the server-side code. JSON-RPC
    processing code is now the same on both server and client side. Many
    minor issues were fixed in the process and there is a new test suite for
    JSON-RPC spec compliance (and non-compliance in some cases).
    
    List of behavior changes:
    
    - Method handlers are now called with a per-request context instead of a
      per-connection context. The context is canceled right after the method
      returns.
    - Subscription error channels are always closed when the connection
      ends. There is no need to also wait on the Notifier's Closed channel
      to detect whether the subscription has ended.
    - Client now omits "params" instead of sending "params": null when there
      are no arguments to a call. The previous behavior was not compliant
      with the spec. The server still accepts "params": null.
    - Floating point numbers are allowed as "id". The spec doesn't allow
      them, but we handle request "id" as json.RawMessage and guarantee that
      the same number will be sent back.
    - Logging is improved significantly. There is now a message at DEBUG
      level for each RPC call served.
    245f3146
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