(2) Go back to timestamp as certificate revision number. This is simpler
and more robust than using the network revision number for this and
forcing network revision fast-forward, which could cause some peers
to fall off the horizon when you don't want them to.
and go ahead and bump version to 1.0.4.
For a while in 1.0.3 -dev I was trying to optimize out repeated network controller
requests by using a ratcheting mechanism. If the client received a network config
that was indeed different from the one it had, it would respond by instantlly
requesting it again.
Not sure what I was thinking. It's fundamentally unsafe to respond to a message
with another message of the same type -- it risks a race condition. In this case
that's exactly what could happen.
It just isn't worth the added complexity to avoid a tiny, tiny amount of network
overhead, so I've taken this whole path out.
A few extra bytes every two minutes isn't worth fretting about, but as I recall
the reason for this optimization was to save CPU on the controller. This can be
achieved by just caching responses in memory *there* and serving those same
responses back out if they haven't changed.
I think I developed that 'ratcheting' stuff before I went full time on this. It's
hard to develop stuff like this without hours of sustained focus.
Multiple statements in a sqlite3_prepare_v2 is not usable. Only
the first statement will be executed.
Since the schema now uses 'ON DELETE CASCADE', there's only
one statement needed.
If multiple statements are needed, there should be either multiple
sqlite3_prepare_v2 calls be used or the sqlite3_exec function.
The foreign keys have 'ON DELETE CASCADE' to simplify the removal
of networks etc. (controller code)
Some unique constraints are replaced with a multi column primary
key.
To update an existing database:
* install updated binaries
* stop service
* sqlite3 controller.db .dump | \
egrep '((^PRAGMA)|(^BEGIN)|(^INSERT)|(^COMMIT))' | \
grep -v 'schemaVersion' > data.sql
* mv controller.db controller.db.backup
* start service
* stop service
* sqlite3 controller.db < data.sql
* start service
