feat: Agave v2 RPC: replace getRecentBlockhash with getLatestBlockhash

src/connection.ts

@@ -2599,20 +2599,6 @@ const GetParsedTransactionRpcResult = jsonRpcResult(
   ),
 );
 
-/**
- * Expected JSON RPC response for the "getRecentBlockhash" message
- *
- * @deprecated Deprecated since RPC v1.8.0. Please use {@link GetLatestBlockhashRpcResult} instead.
- */
-const GetRecentBlockhashAndContextRpcResult = jsonRpcResultAndContext(
-  pick({
-    blockhash: string(),
-    feeCalculator: pick({
-      lamportsPerSignature: number(),
-    }),
-  }),
-);
-
 /**
  * Expected JSON RPC response for the "getLatestBlockhash" message
  */
@@ -4567,13 +4553,29 @@ export class Connection {
       feeCalculator: FeeCalculator;
     }>
   > {
-    const args = this._buildArgs([], commitment);
-    const unsafeRes = await this._rpcRequest('getRecentBlockhash', args);
-    const res = create(unsafeRes, GetRecentBlockhashAndContextRpcResult);
-    if ('error' in res) {
-      throw new SolanaJSONRPCError(res.error, 'failed to get recent blockhash');
-    }
-    return res.result;
+    const {
+      context,
+      value: {blockhash},
+    } = await this.getLatestBlockhashAndContext(commitment);
+    const feeCalculator = {
+      get lamportsPerSignature(): number {
+        throw new Error(
+          'The capability to fetch `lamportsPerSignature` using the `getRecentBlockhash` API is ' +
+            'no longer offered by the network. Use the `getFeeForMessage` API to obtain the fee ' +
+            'for a given message.',
+        );
+      },
+      toJSON() {
+        return {};
+      },
+    };
+    return {
+      context,
+      value: {
+        blockhash,
+        feeCalculator,
+      },
+    };
   }
 
   /**
@@ -5225,7 +5227,7 @@ export class Connection {
     commitment?: Finality,
   ): Promise<ConfirmedBlock> {
     const args = this._buildArgsAtLeastConfirmed([slot], commitment);
-    const unsafeRes = await this._rpcRequest('getConfirmedBlock', args);
+    const unsafeRes = await this._rpcRequest('getBlock', args);
     const res = create(unsafeRes, GetConfirmedBlockRpcResult);
 
     if ('error' in res) {
@@ -5331,7 +5333,7 @@ export class Connection {
         rewards: false,
       },
     );
-    const unsafeRes = await this._rpcRequest('getConfirmedBlock', args);
+    const unsafeRes = await this._rpcRequest('getBlock', args);
     const res = create(unsafeRes, GetBlockSignaturesRpcResult);
     if ('error' in res) {
       throw new SolanaJSONRPCError(res.error, 'failed to get confirmed block');
@@ -5353,7 +5355,7 @@ export class Connection {
     commitment?: Finality,
   ): Promise<ConfirmedTransaction | null> {
     const args = this._buildArgsAtLeastConfirmed([signature], commitment);
-    const unsafeRes = await this._rpcRequest('getConfirmedTransaction', args);
+    const unsafeRes = await this._rpcRequest('getTransaction', args);
     const res = create(unsafeRes, GetTransactionRpcResult);
     if ('error' in res) {
       throw new SolanaJSONRPCError(res.error, 'failed to get transaction');
@@ -5384,7 +5386,7 @@ export class Connection {
       commitment,
       'jsonParsed',
     );
-    const unsafeRes = await this._rpcRequest('getConfirmedTransaction', args);
+    const unsafeRes = await this._rpcRequest('getTransaction', args);
     const res = create(unsafeRes, GetParsedTransactionRpcResult);
     if ('error' in res) {
       throw new SolanaJSONRPCError(
@@ -5411,7 +5413,7 @@ export class Connection {
         'jsonParsed',
       );
       return {
-        methodName: 'getConfirmedTransaction',
+        methodName: 'getTransaction',
         args,
       };
     });