Exit Short

A user can decrease their ercDebt, and potentially leave the shortRecord position entirely to get back the underlying collateral. After exiting the shortRecord, the shorter receives any unclaimed yield if the short.updatedAt time is greater than the YIELD_DELAY_SECONDS ago, as calculated in the function disburseCollateral().

short.updatedAt changes whenever shorter calls the following: fills a short, partially exits a short, increaseCollateral(), combineShort()

General Restrictions:

• Shorter can only exit a valid amount (greater than 0 and less than/equal to total ercDebt of short)
• Cannot exit in a way that leaves behind the minimum amount of ETH or less than minShortErc
• Can only exit if the CR of the shortRecord increases
• Can only primary exit FullyFilled SR (prevents possible error of matching with own short order in the case of PartialFill SR)

Primary Exit Short:

The primary way to exit a short is by going onto the orderbook as a bid via exitShort(). The shorter will use their short's collateral as the sole source of ETH for the bid. The shorter must update the cached oracle data and startingShortId if applicable (15 minutes since last update). Additionally, the ETH offered in the buy back cannot exceed the short's collateral.

Secondary Exit Short:

The secondary way to exit a short is by the shorter providing their own ercEscrowed virtual amount exitShortErcEscrowed() or an appropriate amount of the ercDebt from their wallet (i.e. MetaMask) via exitShortWallet().

If shorter exits via their wallet, the systems burns the ercDebt that is exited.