Commits on Mar 1, 2021

1. [release-v1.6] server: Only send fast block anns to full nodes. …

   Fast block announcements were added a few years ago as a way to increase
   the propagation speed of new blocks that extend the main chain through
   the network to significantly reduce voting latency as well as how
   quickly proof-of-work miners discover new blocks.  This is desirable
   behavior, however, it should only apply to full nodes since only they
   are equipped to deal with the fast announcements.
   
   As a case in point, header commitments and committed block filters can
   pose a problem for lightweight clients that rely on them in the case of
   fast block announcements because lightweight clients tend to request the
   filters as soon as they learn about the new blocks and those filters
   have not been created yet when fast block announcements are sent.
   
   Since there is network latency involved in the request process, the
   result is that sometimes the filters are available by the time the
   requests from lightweight clients are received and sometimes they are
   not.
   
   In order to help prevent the aforementioned case, and other similar
   ones, this modifies the code that deals with block announcements to only
   send fast block announcements to peers that advertise themselves as full
   nodes instead of all nodes and separates out the block announcement
   logic slightly to make future enhancements easier in the process.
   
   It also modifies the filtering of duplicate block announcements to work
   on a per peer basis since not all peers receive the fast block
   announcement now.

   

   davecgh committed Mar 1, 2021
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