Feat/moving mid#79
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…ow returns (price, updateTime).
…s in USMTemplate, should have zero behavior change.
…, storedPrice, distinct from the oracle's mid, latestPrice(). But USMTemplate doesn't actually modify storedPrice yet: that change is coming up...
…ere view-only users (eg Alex's stats webpage) go for stats based on "pretty recent" prices; those needing the very latest prices/stats need to call usm.refreshPrice().
1. Made USMTemplate store and update its own price. 2. Calculate sliding prices based on new math: % change in ETH pool, rather than % change in debt ratio. 3. Major updates to tests, especially test 3, plus removing proxy test 5 (redundant with test 4).
…mber, eg $1200 or whatever.
…ntract code size near the limit again...
… TWAPs: needed to make test 3's sample TWAP observations > 10 min apart. That said I still don't fully understand why it was breaking...
…with test 3's, and compatible with 10-minute TWAPs.
…m Oracle. Now it has an Oracle member instead, like a sane person would do, and it only seems to cost ~1-2k gas per operation? Surprisingly few lines changed too.
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OK, this is now feature-complete, the tests pass, and I think it's good to merge! I need to add/update quite a few comments, and I expect there are some little bugs left, this is hot off the presses. But I'm not aware of any gaping holes. I propose we get this up on kovan and fool around with it (but not announce the testnet version publicly yet because it's too raw - may need to redeploy). Also, don't deploy until reading my next comment here... |
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Feat/undo oracle inheritance hack
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This is a bunch of changes related to the two big new features. Not ready to merge or even test yet, I'll update this PR when it is. I am trying to make each commit reasonably legible and bite-sized.
"Moving mid", ie,
mints/burns/funds/defundsmove the USM contract's mid ETH/USD price separately from oracle updates. (When a fresh oracle price comes in, the USM mid is reset to the oracle's mid; this change is about what happens to the mid between oracle updates.)In plain English, the behavior we're targeting here is: "A short-ETH op (
mint/defund) pushes the system's mid ETH price down, and pushes the price you actually sell at down even more." And of course the reverse for the long-ETH ops,burnandfund.New sliding-price math, based on % change in ETH pool, rather than on % change in debt ratio. Eg, suppose the pool contains 200 ETH, and the user calls
mint(10 ETH), increasing the pool by 5% = a factor of 1.05×. Then our new math says:This math is actually all straightforward: the hairy part is how to translate this for
fund/defund... More on that soon.