fixup! fix(cardano-services): correct mapping of chain history redeemer purpose

Author: mkazlauskas

packages/cardano-services/src/ChainHistory/DbSyncChainHistory/mappers.ts

@@ -105,25 +105,21 @@ export const mapWithdrawal = (withdrawalModel: WithdrawalModel): Cardano.Withdra
 // Remove this and select the actual redeemer data from `redeemer_data` table.
 const stubRedeemerData = Buffer.from('not implemented');
 
-const mapRedeemerPurpose = (purpose: string): Cardano.RedeemerPurpose => {
-  switch (purpose) {
-    case 'cert':
-      return Cardano.RedeemerPurpose.certificate;
-    case 'mint':
-      return Cardano.RedeemerPurpose.mint;
-    case 'spend':
-      return Cardano.RedeemerPurpose.spend;
-    case 'reward':
-      return Cardano.RedeemerPurpose.withdrawal;
-    case 'voting':
-      return Cardano.RedeemerPurpose.vote;
-    case 'proposing':
-      return Cardano.RedeemerPurpose.propose;
-    default:
-      throw new NotImplementedError(`Failed to map redeemer "purpose": ${purpose}`);
-  }
+const redeemerPurposeMap: Record<RedeemerModel['purpose'], Cardano.RedeemerPurpose> = {
+  cert: Cardano.RedeemerPurpose.certificate,
+  mint: Cardano.RedeemerPurpose.mint,
+  proposing: Cardano.RedeemerPurpose.propose,
+  reward: Cardano.RedeemerPurpose.withdrawal,
+  spend: Cardano.RedeemerPurpose.spend,
+  voting: Cardano.RedeemerPurpose.vote
 };
 
+const mapRedeemerPurpose = (purpose: string): Cardano.RedeemerPurpose =>
+  redeemerPurposeMap[purpose as RedeemerModel['purpose']] ||
+  (() => {
+    throw new NotImplementedError(`Failed to map redeemer "purpose": ${purpose}`);
+  })();
+
 export const mapRedeemer = (redeemerModel: RedeemerModel): Cardano.Redeemer => ({
   data: stubRedeemerData,
   executionUnits: {

packages/cardano-services/src/ChainHistory/DbSyncChainHistory/types.ts

@@ -95,7 +95,7 @@ export interface WithdrawalModel {
 
 export interface RedeemerModel {
   index: number;
-  purpose: string;
+  purpose: 'cert' | 'mint' | 'spend' | 'reward' | 'voting' | 'proposing';
   script_hash: Buffer;
   unit_mem: string;
   unit_steps: string;