Ivan Kozlovic aa843945c9 Work on Gateways reply mapping ...

- New prefix that includes origin server for the request
- Mapping done if request is service import or requestor has
  recent subscription
- Subscription considered recent if less than 250ms
- Destination server strip GW prefix before giving to client
  and restore when getting a reply on that subject
- Mapping removed aftert 250ms
- Server rejects client publish on "$GNR." (the new prefix)
- Cluster and server hash are now 8 chars long and from base 62
  alphabets
- Mapped replies need to be sent to leafnode servers due to race
  (cluster B sends RS+ on GW inbound then RMSG on outbound, the
  RS+ may be processed later and cluster A may have given message
  to LN before RS+ on reply subject. So LN needs to accept the
  mapped reply but will strip to give to client and reassemble
  before sending it back)

Signed-off-by: Ivan Kozlovic <ivan@synadia.com>

2019-11-06 16:06:49 -07:00

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