sdk: add getMaxSwapAmount (#488)

* temp * add calculateSpotPositionFreeCollateralContribution * sdk: do binary search for max token swap * fix boundary conditions * fix edge case causing inf loop * try to add leverage * remove some console.logs * make leverage work for reducing position * make it work w small accounts * make initial max swap larger * add accountLeverageAfterSwap * dont throw error in getSpotTokenAmount * allow custom calcuateSwap fn and iteration limit * CHANGELOG
drift-labs · Jun 22, 2023 · 950b61c · 950b61c
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Features
 
+- ts-sdk: add getMaxSwapAmount (([#488](https://github.com/drift-labs/protocol-v2/pull/488)))
 - program: add bulk place orders ix (([#499](https://github.com/drift-labs/protocol-v2/pull/499)))
 - ts-sdk: add stakeForMSOL to driftClient (([#500](https://github.com/drift-labs/protocol-v2/pull/500)))
 - ts-sdk: driftClient accepts default txParams (([#496](https://github.com/drift-labs/protocol-v2/pull/496)))

diff --git a/sdk/src/math/utils.ts b/sdk/src/math/utils.ts
@@ -34,6 +34,10 @@ export const divCeil = (a: BN, b: BN): BN => {
 	}
 };
 
+export const sigNum = (x: BN): BN => {
+	return x.isNeg() ? new BN(-1) : new BN(1);
+};
+
 /**
  * calculates the time remaining until the next update based on a rounded, "on-the-hour" update schedule
  * this schedule is used for Perpetual Funding Rate and Revenue -> Insurance Updates