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feat(modules/amm): add_liquidity_quote takes slippage, returns minimumLpRaw

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The add-liquidity quote now takes slippageBps and returns minimumLpRaw =
floor(delta_lp * (10000 - slippage) / 10000) — the LP floor the submit passes as
min_amount_liquidity, mirroring the swap quotes' minReceivedRaw. Computing it in
Rust keeps the u128 slippage math out of the UI. Adds invalid_slippage (>= 100%)
and minimum_lp_zero (slippage leaves no floor) errors; the module's
addLiquidityQuote forwards slippageBps.
This commit is contained in:
r4bbit
2026-08-11 17:51:51 +02:00
parent c95322c033
commit 37f28fe663
3 changed files with 64 additions and 10 deletions
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modules/amm/src/amm_module_impl.cpp
+15 -1
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@@ -896,17 +896,31 @@ LogosMap AmmModuleImpl::addLiquidityQuote(const LogosMap& request) {
const json pool = readPublicAccount(jStr(poolId.value, "poolId"));
const std::string pool_data = jStr(pool.value("account", json::object()), "data");
// slippageBps is a fraction of 100% in basis points; the pricing op uses it to derive
// minimumLpRaw (the LP floor the submit accepts). Require an integer JSON number and reject
// everything else with a stable invalid_slippage: is_number() would also accept a float
// (and get<int64_t>() on a number_float THROWS, terminating the module), while a string /
// bool would otherwise fall through to a silent 0. A missing field defaults to 0 (no
// slippage). A negative or >= 100% value is likewise invalid_slippage.
const json slippage_val = request.value("slippageBps", json(0));
if (!slippage_val.is_number_integer())
return error("invalid_slippage");
const int64_t slippage_bps = slippage_val.get<int64_t>();
if (slippage_bps < 0 || slippage_bps >= 10000)
return error("invalid_slippage");
const FfiResult quoteResult = call(amm_add_liquidity_quote, json{
{"tokenAId", token_a},
{"tokenBId", token_b},
{"maxAmountARaw", max_a_decimal},
{"maxAmountBRaw", max_b_decimal},
{"slippageBps", slippage_bps},
{"poolData", pool_data},
});
if (!quoteResult.ok)
return error(quoteResult.error.empty() ? "backend_error" : quoteResult.error);
// Success: wrap { amountARaw, amountBRaw, expectedLpRaw, priceRaw } in the envelope.
// Success: wrap { amountARaw, amountBRaw, expectedLpRaw, minimumLpRaw, priceRaw }.
LogosMap out = quoteResult.value;
out["status"] = "ok";
out["error"] = "";