feat(simple-tx): showcase mempool endpoint

examples/simple-transaction/src/index.ts

@@ -70,7 +70,7 @@ const run = async () => {
   }
 
   // Prepare transaction
-  const { txHash, txBody } = composeTransaction(
+  const { txBody } = composeTransaction(
     address,
     OUTPUT_ADDRESS,
     OUTPUT_AMOUNT,
@@ -83,14 +83,20 @@ const run = async () => {
 
   // Push transaction to network
   try {
-    const res = await client.txSubmit(transaction.to_bytes());
-    if (res) {
-      console.log(`Transaction successfully submitted: ${txHash}`);
-    }
+    // txSubmit endpoint returns transaction hash on successful submit
+    const txHash = await client.txSubmit(transaction.to_bytes());
+
+    // Before the tx is included in a block it is a waiting room known as mempool
+    // Retrieve transaction from Blockfrost Mempool
+    const mempoolTx = await client.mempoolTx(txHash);
+    console.log("Mempool Tx:");
+    console.log(JSON.stringify(mempoolTx, undefined, 4));
+
+    console.log(`Transaction successfully submitted: ${txHash}\n`);
   } catch (error) {
     // submit could fail if the transactions is rejected by cardano node
     if (error instanceof BlockfrostServerError && error.status_code === 400) {
-      console.log(`Transaction ${txHash} rejected`);
+      console.log(`Transaction rejected`);
       // Reason for the rejection is in error.message
       console.log(error.message);
     } else {