Addresses #357 and #365. Although not a very large change, this PR ends up touching rather a lot of code.
* Converted types `Usd`, `Leverage` and `Percent` to something that is appropriate to this application
* Created new types `Price` and `InversePrice` to use for BTC/USD exchange rate with appropriate algebraic ops implemented as well.
* Added new positive tests
* The function `daemon::model::calculate_profit()` has been changed substantially as the updated types make the existing workflow needlessly complex
* Some tests (mostly in `cfd.rs` required updating) in order to make use of the new types.
* Minor edit to `.gitignore` to avoid accidental pushing of DB to repository--should have been it's own item, added here to fix a problem that arose during this work.
NOTE:
* There may be an excess of algebraic ops implemented, some pruning may be appropriate.
Fetching new events all over the place is cumbersome and it is likely that we will forget about doing so (e.g. atm we forgot doing this when receiving a roll-over request at the maker). Hence, we now fetch on a regular interval for a fixed timespan:
When starting up we fetch oracle events for the next 24h. Afterwards we check every 5 minutes again if there is a new event to check. This should ensure that we always know about needed events.
Daniel Karzel
DelicioiusHair
Philipp Hoenisch