the bitcoin tab has now some basic status and stats: parts of blockchain
info, network info and mempool. this is far from complete but makes a
good start for an initial version.
the gui playground is also updated to sent some stub info via comms
periodically.
this adds a very simple bitcoind RPC client able to make a few queries
like the blockchain and network status. the daemon uses the client
to get the bitcoind status and sends a report through comms periodically.
there's also a little playground program which simply dumps a query
result to stderr. built on demand with "zig build btcrpc".
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most troubles were due to blocking nature of child process pipe
descriptions which made comm.read loops hang in various places
under certain conditions.
this commit moves all read/writes in separate threads to be able to
always watch for sig TERM and INT, and ensures child process pipes
are closed early allowing comm.read loops to terminate.
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this greatly improves UX during shutdown: no need to guess at which
point it's ok to unplug the power cord.
the commit also includes a GUI playground. a sort of a fake daemon which
sends hardcoded messages to ngui. useful for manual debugging and trying
different UX scenarious.
alex