This change makes the limits be static variables, which means they are
only settable once for a process. The only usecase so far is to use much
smaller limits in testing situations.
This allows queries like RPC and mempool-accept to continue
even during a prune (we just use the 'old' DB) and when its
done the last active query will delete the old DB.
This assumes a sane filesystem where you can rename a file that
is in use.
Flowee changed in that regtest has to be given on the commandline
allowing different config files for different chains.
So pass the regtest on the commandline.
On all mature operating systems and filesystems creation of a 1GB file
will not actually use that data, only when we start using blocks does
the disk space get used.
As such this is a premature optimization that Core added and I ported to
Flowee which this commit removes.
Additionally, increase the block file size to 1GiB
Instead of having a magic 10 open files, we now have a scheduled
run that closes all mapped files 30 seconds after last usage.
This allows many files to be opened with extremely low overhead and
cost (they are not actually loaded until needed, and even then only
per 4K page).
We inherited the design from Core that you can put in your config
file which chain you will follow (testnet, regtest).
This has the effect that you can't have different config files for
different chains and that we always read the fallback location for
all chains. Especially the last one is just harmful.
So, regtest/testnet can only be selected from commandline.
If you choose one of those, it will look for a flowee.conf in the
related subdir (flowee/regtest/flowee.conf for instance) and NOT
for the global one. The global one is only ever read for mainnet.
TomZ