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fix: 修复订单金额精度问题

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- 修复 makerAmount 和 takerAmount 的精度限制
  - makerAmount (USDC) 最多 2 位小数
  - takerAmount (shares) 最多 4 位小数
- 区分 BUY 和 SELL 订单的精度处理
- 确保在转换为 wei 之前先进行精度舍入，符合 Polymarket API 要求
This commit is contained in:
WrBug
2025-12-03 02:35:09 +08:00
parent 7eb310b35e
commit 220afd748f
1 changed files with 22 additions and 16 deletions
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backend/src/main/kotlin/com/wrbug/polymarketbot/service/OrderSigningService.kt
+22 -16
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@@ -37,6 +37,12 @@ class OrderSigningService {
amount = 4
)
// 金额精度限制（根据 Polymarket API 要求）
// makerAmount (USDC) 最多 2 位小数
// takerAmount (shares) 最多 4 位小数
private val MAKER_AMOUNT_DECIMALS = 2 // USDC 金额精度
private val TAKER_AMOUNT_DECIMALS = 4 // shares 数量精度
/**
* 订单金额计算结果
*/
@@ -77,37 +83,37 @@ class OrderSigningService {
if (side.uppercase() == "BUY") {
// BUY: makerAmount = price * size (USDC), takerAmount = size (shares)
// makerAmount 是 USDC 金额，最多 2 位小数
// takerAmount 是 shares 数量，最多 4 位小数
val rawTakerAmt = roundDown(sizeDecimal, roundConfig.size)
var rawMakerAmt = rawTakerAmt.multiply(roundedPrice)
// 确保金额精度
if (rawMakerAmt.scale() > roundConfig.amount) {
rawMakerAmt = roundUp(rawMakerAmt, roundConfig.amount + 4)
if (rawMakerAmt.scale() > roundConfig.amount) {
rawMakerAmt = roundDown(rawMakerAmt, roundConfig.amount)
}
}
// 确保 makerAmount 精度（USDC，最多 2 位小数）
rawMakerAmt = roundDown(rawMakerAmt, MAKER_AMOUNT_DECIMALS)
// 确保 takerAmount 精度（shares，最多 4 位小数）
val finalTakerAmt = roundDown(rawTakerAmt, TAKER_AMOUNT_DECIMALS)
// 转换为 wei（6 位小数）
val makerAmount = parseUnits(rawMakerAmt, COLLATERAL_TOKEN_DECIMALS)
val takerAmount = parseUnits(rawTakerAmt, COLLATERAL_TOKEN_DECIMALS)
val takerAmount = parseUnits(finalTakerAmt, COLLATERAL_TOKEN_DECIMALS)
return OrderAmounts(makerAmount.toString(), takerAmount.toString())
} else {
// SELL: makerAmount = size (shares), takerAmount = price * size (USDC)
// makerAmount 是 shares 数量，最多 4 位小数
// takerAmount 是 USDC 金额，最多 2 位小数
val rawMakerAmt = roundDown(sizeDecimal, roundConfig.size)
var rawTakerAmt = rawMakerAmt.multiply(roundedPrice)
// 确保金额精度
if (rawTakerAmt.scale() > roundConfig.amount) {
rawTakerAmt = roundUp(rawTakerAmt, roundConfig.amount + 4)
if (rawTakerAmt.scale() > roundConfig.amount) {
rawTakerAmt = roundDown(rawTakerAmt, roundConfig.amount)
}
}
// 确保 makerAmount 精度（shares，最多 4 位小数）
val finalMakerAmt = roundDown(rawMakerAmt, TAKER_AMOUNT_DECIMALS)
// 确保 takerAmount 精度（USDC，最多 2 位小数）
rawTakerAmt = roundDown(rawTakerAmt, MAKER_AMOUNT_DECIMALS)
// 转换为 wei（6 位小数）
val makerAmount = parseUnits(rawMakerAmt, COLLATERAL_TOKEN_DECIMALS)
val makerAmount = parseUnits(finalMakerAmt, COLLATERAL_TOKEN_DECIMALS)
val takerAmount = parseUnits(rawTakerAmt, COLLATERAL_TOKEN_DECIMALS)
return OrderAmounts(makerAmount.toString(), takerAmount.toString())