sdk: quote destination amount truncation fix

sdk/route/src/automatic.ts

@@ -121,12 +121,17 @@ export class NttAutomaticRoute<N extends Network>
       request.toChain.config.nativeTokenDecimals
     );
 
-    const amt = amount.parse(params.amount, request.source.decimals);
+    const parsedAmount = amount.parse(params.amount, request.source.decimals);
+    // The trimmedAmount may differ from the parsedAmount if the parsedAmount includes dust
+    const trimmedAmount = NttRoute.trimAmount(
+      parsedAmount,
+      request.destination.decimals
+    );
 
     const validatedParams: Vp = {
       amount: params.amount,
       normalizedParams: {
-        amount: amt,
+        amount: trimmedAmount,
         sourceContracts: NttRoute.resolveNttContracts(
           this.staticConfig,
           request.source.id
@@ -160,6 +165,11 @@ export class NttAutomaticRoute<N extends Network>
       params.normalizedParams.options
     );
 
+    const dstAmount = amount.scale(
+      params.normalizedParams.amount,
+      request.destination.decimals
+    );
+
     const result: QR = {
       success: true,
       params,
@@ -169,7 +179,7 @@ export class NttAutomaticRoute<N extends Network>
       },
       destinationToken: {
         token: request.destination.id,
-        amount: amount.parse(params.amount, request.destination.decimals),
+        amount: dstAmount,
       },
       relayFee: {
         token: Wormhole.tokenId(fromChain.chain, "native"),
@@ -190,10 +200,6 @@ export class NttAutomaticRoute<N extends Network>
     const duration = await dstNtt.getRateLimitDuration();
     if (duration > 0n) {
       const capacity = await dstNtt.getCurrentInboundCapacity(fromChain.chain);
-      const dstAmount = amount.parse(
-        params.amount,
-        request.destination.decimals
-      );
       if (
         NttRoute.isCapacityThresholdExceeded(amount.units(dstAmount), capacity)
       ) {

sdk/route/src/manual.ts

@@ -102,7 +102,13 @@ export class NttManualRoute<N extends Network>
   ): Promise<Vr> {
     const options = params.options ?? this.getDefaultOptions();
 
-    const amt = amount.parse(params.amount, request.source.decimals);
+    const parsedAmount = amount.parse(params.amount, request.source.decimals);
+    // The trimmedAmount may differ from the parsedAmount if the parsedAmount includes dust
+    const trimmedAmount = NttRoute.trimAmount(
+      parsedAmount,
+      request.destination.decimals
+    );
+
     const gasDropoff = amount.units(
       amount.parse(
         options.gasDropoff ?? "0.0",
@@ -113,7 +119,7 @@ export class NttManualRoute<N extends Network>
     const validatedParams: Vp = {
       amount: params.amount,
       normalizedParams: {
-        amount: amt,
+        amount: trimmedAmount,
         sourceContracts: NttRoute.resolveNttContracts(
           this.staticConfig,
           request.source.id
@@ -137,6 +143,11 @@ export class NttManualRoute<N extends Network>
     request: routes.RouteTransferRequest<N>,
     params: Vp
   ): Promise<QR> {
+    const dstAmount = amount.scale(
+      params.normalizedParams.amount,
+      request.destination.decimals
+    );
+
     const result: QR = {
       success: true,
       params,
@@ -146,7 +157,7 @@ export class NttManualRoute<N extends Network>
       },
       destinationToken: {
         token: request.destination.id,
-        amount: amount.parse(params.amount, request.destination.decimals),
+        amount: dstAmount,
       },
       eta: finality.estimateFinalityTime(request.fromChain.chain),
     };
@@ -157,10 +168,6 @@ export class NttManualRoute<N extends Network>
     const duration = await dstNtt.getRateLimitDuration();
     if (duration > 0n) {
       const capacity = await dstNtt.getCurrentInboundCapacity(fromChain.chain);
-      const dstAmount = amount.parse(
-        params.amount,
-        request.destination.decimals
-      );
       if (
         NttRoute.isCapacityThresholdExceeded(amount.units(dstAmount), capacity)
       ) {

sdk/route/src/types.ts

@@ -18,6 +18,8 @@ export namespace NttRoute {
   // Currently only wormhole attestations supported
   export type TransceiverType = "wormhole";
 
+  export const TRIMMED_DECIMALS = 8;
+
   export type TransceiverConfig = {
     type: TransceiverType;
     address: string;
@@ -212,4 +214,16 @@ export namespace NttRoute {
     const threshold = (capacity * 95n) / 100n;
     return amount > threshold;
   }
+
+  export function trimAmount(
+    amt: amount.Amount,
+    dstTokenDecimals: number
+  ): amount.Amount {
+    // remove dust to avoid `TransferAmountHasDust` revert reason
+    const truncatedAmount = amount.truncate(
+      amt,
+      Math.min(amt.decimals, dstTokenDecimals, NttRoute.TRIMMED_DECIMALS)
+    );
+    return truncatedAmount;
+  }
 }