Generate watcher with DB caching for multiple return type

packages/azimuth-watcher/src/database.ts

@@ -433,9 +433,9 @@ export class Database implements DatabaseInterface {
     return repo.save(entity);
   }
 
-  async saveGetKeys ({ blockHash, blockNumber, contractAddress, _point, value, proof }: DeepPartial<GetKeys>): Promise<GetKeys> {
+  async saveGetKeys ({ blockHash, blockNumber, contractAddress, _point, value0, value1, value2, value3, proof }: DeepPartial<GetKeys>): Promise<GetKeys> {
     const repo = this._conn.getRepository(GetKeys);
-    const entity = repo.create({ blockHash, blockNumber, contractAddress, _point, value, proof });
+    const entity = repo.create({ blockHash, blockNumber, contractAddress, _point, value0, value1, value2, value3, proof });
     return repo.save(entity);
   }
 

packages/azimuth-watcher/src/entity/GetKeys.ts

@@ -24,7 +24,16 @@ export class GetKeys {
     _point!: bigint;
 
   @Column('varchar')
-    value!: string;
+    value0!: string;
+
+  @Column('varchar')
+    value1!: string;
+
+  @Column('numeric', { transformer: bigintTransformer })
+    value2!: bigint;
+
+  @Column('numeric', { transformer: bigintTransformer })
+    value3!: bigint;
 
   @Column('text', { nullable: true })
     proof!: string;

packages/azimuth-watcher/src/indexer.ts

@@ -124,6 +124,24 @@ export class Indexer implements IndexerInterface {
   }
 
   async getKeys (blockHash: string, contractAddress: string, _point: bigint): Promise<ValueResult> {
+    const entity = await this._db.getGetKeys({ blockHash, contractAddress, _point });
+    if (entity) {
+      log('getKeys: db hit.');
+
+      return {
+        value: {
+          value0: entity.value0,
+          value1: entity.value1,
+          value2: entity.value2,
+          value3: entity.value3
+        },
+        proof: JSON.parse(entity.proof)
+      };
+    }
+
+    const { block: { number } } = await this._ethClient.getBlockByHash(blockHash);
+    const blockNumber = ethers.BigNumber.from(number).toNumber();
+
     log('getKeys: db miss, fetching from upstream server');
 
     const abi = this._abiMap.get(KIND_AZIMUTH);
@@ -141,6 +159,8 @@ export class Indexer implements IndexerInterface {
 
     const result: ValueResult = { value };
 
+    await this._db.saveGetKeys({ blockHash, blockNumber, contractAddress, _point, value0: value.value0, value1: value.value1, value2: value.value2, value3: value.value3, proof: JSONbigNative.stringify(result.proof) });
+
     return result;
   }