This new class encapsulates all functionality related to detecting a
local Bitcoin node and reporting whether or not it was detected.
Previously this functionality was spread across the Config class
(formerly BisqEnvironment) with its mutable static
isLocalBitcoinNodeRunning property and the BisqSetup class with its
checkIfLocalHostNodeIsRunning method. All of this functionality now
lives within the LocalBitcoinNode class, an instance of which is wired
up via Guice and injected wherever necessary.
Note that the code for detecting whether the node is running has been
simplified, in that it is no longer wrapped in its own dedicated Thread.
There appears to be no performance benefit from doing so, and leaving it
in place would have made testing more difficult than necessary.
Several methods in BisqSetup have also been refactored to accept
callbacks indicating which step should be run next. This has the effect
of clarifying when the step2()-step5() methods will be called.
Previously this static property had been managed within
BaseCurrencyNetwork itself and was accessed directly by callers. Now it
is managed within Config, made private and accessed only via the
new and well-documented baseCurrencyNetwork() method. The same goes for
baseCurrencyNetworkParameters().
It is unfortunate that we must retain these mutable static fields and
accessors, but after trying to eliminate them entirely, this approach is
the lesser of two evils; attempting to use a Config instance and
instance methods only ends up being quite cumbersome to implement,
requiring Config to be injected into many more classes than it currently
is. Getting access to the BaseCurrencyNetwork is basically a special
case, and treating it specially as a static field is in the end the most
pragmatic approach.
Prior to this commit, the way that the appDataDir and its subdirectories
were created was a haphazard process that worked but in a fragile and
non-obvious way. When Config was instantiated, an attempt to call
btcNetworkDir.mkdir() was made, but if appDataDir did not already exist,
this call would always fail because mkdir() does not create parent
directories. This problem was never detected, though, because the
KeyStorage class happened to call mkdirs() on its 'keys' subdirectory,
which, because of the plural mkdirs() call ended up creating the whole
${appDataDir}/${btcNetworkDir}/keys hierarchy. Other btcNetworkDir
subdirectories such as tor/ and db/ then benefited from the hierarchy
already existing when they attempted to call mkdir() for their own dirs.
So the whole arrangement worked only because KeyStorage happened to make
a mkdirs() call and because that code in KeyStorage happened to get
invoked before the code that managed the other subdirectories.
This change ensures that appDataDir and all its subdirectories are
created up front, such that they are guaranteed to exist by the time
they are injected into Storage, KeyStorage, WalletsSetup and TorSetup.
The hierarchy is unchanged, structured as it always has been:
${appDataDir}
└── btc_mainnet
├── db
├── keys
├── wallet
└── tor
Note that the tor/ subdirectory actually gets deleted and re-created
within the TorSetup infrastructure regardless of whether the directory
exists beforehand.
Option handling is now the responsibility of the Config class. JOpt's
OptionParser is no longer passed down to BisqExecutable subclasses'
doExecute method, as they can now rely on the Config abstraction.
In previous commits, BisqEnvironment functionality has been fully ported
to the new, simpler and more type-safe Config class. This change removes
BisqEnvironment and all dependencies on the Spring Framework Environment
interface that it implements.
The one exception is the pricenode module, which is separate and apart
from the rest of the codebase in that it is a standalone, Spring-based
HTTP service.
Note that this change makes the user-facing change of renaming
the 'numConnectionForBtc' (singular 'Connection') to
'numConnectionsForBtc' (plural 'Connections'). It is presumed that not
many users are relying on this option for day-to-day operations, and the
singular version was pretty clearly a typo / oversight.
