MPT metadata sample code: add lookup/decoding to example

Author: mDuo13

_code-samples/issue-mpt-with-metadata/js/issue-mpt-with-metadata.js

@@ -1,4 +1,4 @@
-import { stringToHex } from '@xrplf/isomorphic/dist/utils/index.js'
+import { stringToHex, hexToString } from '@xrplf/isomorphic/dist/utils/index.js'
 import { MPTokenIssuanceCreateFlags, Client } from 'xrpl'
 
 // Connect to network and get a wallet
@@ -55,13 +55,31 @@ const mpt_issuance_create = {
 
 // Prepare, sign, and submit the transaction
 console.log('Sending MPTokenIssuanceCreate transaction...')
-const result = await client.submitAndWait(mpt_issuance_create, { wallet, autofill: true })
+const submit_response = await client.submitAndWait(mpt_issuance_create, { wallet, autofill: true })
 
 // Check transaction results and disconnect
-console.log(JSON.stringify(result, null, 2))
-if (result.result.meta.TransactionResult === 'tesSUCCESS') {
-  const issuance_id = result.result.meta.mpt_issuance_id
-  console.log(`MPToken created successfully with issuance ID ${issuance_id}.`)
+console.log(JSON.stringify(submit_response, null, 2))
+if (submit_response.result.meta.TransactionResult !== 'tesSUCCESS') {
+  const result_code = response.result.meta.TransactionResult
+  console.warn(`Transaction failed with result code ${result_code}.`)
+  process.exit(1)
 }
 
+const issuance_id = submit_response.result.meta.mpt_issuance_id
+console.log(`MPToken created successfully with issuance ID ${issuance_id}.`)
+
+// Look up MPT Issuance entry in the validated ledger
+console.log('Confirming MPT Issuance metadata in the validated ledger.')
+const ledger_entry_response = await client.request({
+  "command": "ledger_entry",
+  "mpt_issuance": issuance_id,
+  "ledger_index": "validated"
+})
+
+// Decode the metadata
+const metadata_blob = ledger_entry_response.result.node.MPTokenMetadata
+const decoded_metadata = JSON.parse(hexToString(metadata_blob))
+console.log('Decoded metadata:', decoded_metadata)
+
+
 client.disconnect()

_code-samples/issue-mpt-with-metadata/py/issue-mpt-with-metadata.py

@@ -1,9 +1,9 @@
 import json
-from xrpl.utils import str_to_hex
+from xrpl.utils import str_to_hex, hex_to_str
 from xrpl.clients import JsonRpcClient
 from xrpl.wallet import generate_faucet_wallet
 from xrpl.transaction import submit_and_wait
-from xrpl.models.transactions import MPTokenIssuanceCreate, MPTokenIssuanceCreateFlag
+from xrpl.models import LedgerEntry, MPTokenIssuanceCreate, MPTokenIssuanceCreateFlag
 
 # Set up client and get a wallet
 client = JsonRpcClient("https://s.devnet.rippletest.net:51234")
@@ -60,7 +60,23 @@
 response = submit_and_wait(mpt_issuance_create, client, wallet, autofill=True)
 print(json.dumps(response.result, indent=2))
 
-# Check transaction results and disconnect
-if response.result["meta"]["TransactionResult"] == "tesSUCCESS":
-    issuance_id = response.result["meta"]["mpt_issuance_id"]
-    print(f"MPToken successfully created with issuance ID {issuance_id}")
+# Check transaction results
+result_code = response.result["meta"]["TransactionResult"]
+if result_code != "tesSUCCESS":
+    print(f"Transaction failed with result code {result_code}")
+    exit(1)
+
+issuance_id = response.result["meta"]["mpt_issuance_id"]
+print(f"MPToken successfully created with issuance ID {issuance_id}")
+
+# Look up MPT Issuance entry in the validated ledger
+print("Confirming MPT Issuance metadata in the validated ledger.")
+ledger_entry_response = client.request(LedgerEntry(
+    mpt_issuance=issuance_id,
+    ledger_index="validated"
+))
+
+# Decode the metadata
+metadata_blob = ledger_entry_response.result["node"]["MPTokenMetadata"]
+decoded_metadata = json.loads(hex_to_str(metadata_blob))
+print("Decoded metadata:", decoded_metadata)