fix(sdk-coin-sol): set priority fee in initBuilder

Ticket: COIN-2932

Author: Vijay-Jagannathan

modules/sdk-coin-sol/src/lib/transactionBuilder.ts

@@ -76,6 +76,10 @@ export abstract class TransactionBuilder extends BaseTransactionBuilder {
     this.feePayer(txData.feePayer as string);
     this.nonce(txData.nonce, txData.durableNonce);
     this._instructionsData = instructionParamsFactory(tx.type, tx.solTransaction.instructions);
+    // Parse priority fee instruction data
+    const filteredPriorityFeeInstructionsData = txData.instructionsData.filter(
+      (data) => data.type === InstructionBuilderTypes.SetPriorityFee
+    );
 
     for (const instruction of this._instructionsData) {
       if (instruction.type === InstructionBuilderTypes.Memo) {
@@ -87,6 +91,12 @@ export abstract class TransactionBuilder extends BaseTransactionBuilder {
         const advanceNonceInstruction: Nonce = instruction;
         this.nonce(txData.nonce, advanceNonceInstruction.params);
       }
+
+      // If prio fee instruction exists, set the priority fee variable
+      if (instruction.type === InstructionBuilderTypes.SetPriorityFee) {
+        const priorityFeeInstructionsData = filteredPriorityFeeInstructionsData[0];
+        this.setPriorityFee({ amount: Number(priorityFeeInstructionsData.params.fee) });
+      }
     }
   }
 

modules/sdk-coin-sol/test/unit/transactionBuilder/transactionBuilder.ts

@@ -3,7 +3,7 @@ import * as bs58 from 'bs58';
 
 import { getBuilderFactory } from '../getBuilderFactory';
 import { KeyPair, TokenTransferBuilder } from '../../../src';
-import { Eddsa, FeeOptions, TransactionType } from '@bitgo/sdk-core';
+import { Eddsa, TransactionType } from '@bitgo/sdk-core';
 import * as testData from '../../resources/sol';
 import BigNumber from 'bignumber.js';
 import { Ed25519Bip32HdTree } from '@bitgo/sdk-lib-mpc';
@@ -164,10 +164,9 @@ describe('Sol Transaction Builder', async () => {
       testData.TOKEN_TRANSFER_SIGNED_TX_WITH_MEMO_AND_DURABLE_NONCE
     ) as TokenTransferBuilder;
     const prioFeeMicroLamports = '10000000';
-    const priorityFee: FeeOptions = {
-      amount: prioFeeMicroLamports,
-    };
-    txBuilder.setPriorityFee(priorityFee);
+    // We don't have to manually set the priority fee here as the raw txn already has the priority fee instruction;
+    // therefore once initBuilder is called (it's called within fromImplementation), it will set the txBuilder's priorityFee field
+    // which will then be used in txBuilder.build() by tokenTransferBuilder to add the set compute fee instruction
     const builtTx = await txBuilder.build();
     should.equal(builtTx.type, TransactionType.Send);
     should.equal(