Unix sockets provide better security and performance, so it is natural
for electrs to want to support them. Because of how similar they are to
TCP sockets the required changes are theoretically small. However, there
is no crate I know of that provided the abstract API, so I made one.
I originally only wanted to support electrum RPC but it turns out not
having to deal with two sets of `SocketAddr` is easier and it wasn't too
difficult. Unix socket was already supported by `tiny_http` via their
own abstraction and we have no other dependencies requiring TCP.
Because this also required modifying the logic around publishing the
electrum address I added an option to set it explicitly regardless of
whether the user is dealing with Unix or TCP socket because having this
is useful for TCP too - the user might want to publish a different port
number if the port was mapped via NAT or a different address when
tunnelled. In theory, this is still not perfect because the same server
could be tunnelled multiple times but we don't bother with such edge
case until someone requires it.
Another side improvement is reporting if the accept thread ends because
of incoming stream ending rather than error. This should never happen
but is useful for debugging if it ever does.
There's no point in limiting this option to signet only. Allowing this
flag to be set outside of signet networks lets electrs be used for
custom testing networks that aren't signets.
We still support them (by computing them on-demand) and caching them with `--cache-merkle-proofs`.
Also, don't compute block's txids if we don't cache merkle proofs during subscription
3ce23ae01e (r59562642)
This implements automatic reindexing of old database, turned on by
default. When an old database is detected and `auto_reindex` is turned
on the database will be destroyed so that `electrs` can re-sync. The
user can still turn this off to check db format.
The help message says "or inconsistent" - this is not implemented but we
could in the future and it seems reasonable to explicitly state that
this option will control that thing as well.
Note: 0.8.x versions of `electrs` didn't contain format information -
so we check if the database is empty and assuming it's legacy if it's
not empty but without format information.
The code is also restructured a bit and a few tests are added.
