This commit simply alphabetizes the subsystem logger variables, map, and
use switch so the order in the code is consistent with the sorted output
displayed when using --debuglevel.
This commit adds a new option, --logdir, which works in the same fashion
as the --datadir option. Consequently, the logging directory is name
"namespaced" by the network as well. This resolves the issue where two
btcd instances running (one for mainnet and one for testnet) would
overwrite each other's log files by default.
It also provides the user with a method to change the logging location to
non-default locations if they prefer. For example, it enables multiple
btcd instances on the same network to specify unique logging directories
(even though running multiple btcd instances on the same network is not
the most sane configuration).
Closes#95.
This commit modifies the logging to also log all output to a rolling log
file in the btcd home directory under the logs folder. It uses a maximum
size of 10MB per log file and a max rotation size of 3. This means the
log files will not exceed 30 megabytes.
Also, make every subsystem within btcd use its own logger instance so each
subsystem can have its own level specified independent of the others.
This is work towards #48.
This commit is a first pass at improving the logging. It changes a number
of things to improve the readability of the output. The biggest addition
is message summaries for each message type when using the debug logging
level.
There is sitll more to do here such as allowing the level of each
subsystem to be independently specified, syslog support, and allowing the
logging level to be changed run-time.
