Add ledger file persist

2025-11-04 12:25:48 +00:00 · 2023-10-01 02:20:56 +02:00
parent 6cbb0630fd
commit 250cd7f123
2 changed files with 86 additions and 8 deletions
--- a/lib/onLedger.mjs
+++ b/lib/onLedger.mjs
@@ -0,0 +1,78 @@
+import { writeFile } from 'fs'
+import { stat } from 'fs'
+import { ledgerIndexToFolders } from './ledgerIndexToFolders.mjs'
+import 'dotenv/config'
+
+const obtainedHumanReadableLedgers = []
+const obtainedBinaryTxLedgers = []
+
+const onLedger = async ({
+  networkId,
+  ledger,
+  connection,
+}) => {
+  if ((ledger?.type || '').toUpperCase() === 'LEDGERCLOSED') {
+    if (ledger?.txn_count > 0 && ledger?.ledger_index) {
+      const relativeStoreDir = 'store/' + networkId + '/' + ledgerIndexToFolders(ledger.ledger_index)
+      const storeDir = new URL('../' + relativeStoreDir, import.meta.url).pathname
+
+      const dirExists = await new Promise(resolve => stat(storeDir, staterr => resolve(!staterr)))
+
+      if (dirExists) {
+        ;[
+          ...(
+            obtainedBinaryTxLedgers.indexOf(ledger.ledger_index) < 0
+              ? [
+                  connection.send({
+                    command: 'ledger',
+                    ledger_index: ledger.ledger_index,
+                    transactions: true,
+                    expand: true,
+                    binary: true,
+                  })
+                ]
+              : []),
+          ...(
+            obtainedHumanReadableLedgers.indexOf(ledger.ledger_index) < 0
+              ? [
+                  connection.send({
+                    command: 'ledger',
+                    ledger_index: ledger.ledger_index,
+                  })
+                ]
+              : []),
+        ].map(query => query.then(results => {
+          if (results?.validated && results?.ledger_index === ledger?.ledger_index && results?.ledger_hash === ledger?.ledger_hash) {
+            if (results?.ledger?.transactions && obtainedBinaryTxLedgers.indexOf(ledger.ledger_index) < 0) {
+              obtainedBinaryTxLedgers.unshift(results.ledger_index)
+              obtainedBinaryTxLedgers.length = 250
+
+              console.log('Obtained ledger (binary)', results.ledger_index, results.ledger.transactions.length)
+              writeFile(storeDir + '/ledger_binary_transactions.json', Buffer.from(JSON.stringify(results.ledger), 'utf8'), err => {
+                if (err) {
+                  console.log('Error writing file @ ' + storeDir)
+                }
+              })
+            }
+            if (results?.ledger?.parent_hash && obtainedHumanReadableLedgers.indexOf(ledger.ledger_index) < 0) {
+              obtainedHumanReadableLedgers.unshift(results.ledger_index)
+              obtainedHumanReadableLedgers.length = 250
+        
+              console.log('Obtained ledger (JSON object)', results.ledger_index, results.ledger.ledger_hash)
+              writeFile(storeDir + '/ledger.json', Buffer.from(JSON.stringify(results.ledger), 'utf8'), err => {
+                if (err) {
+                  console.log('Error writing file @ ' + storeDir)
+                }
+              })
+            }
+          }
+        }))
+      }
+
+    }
+  }
+}
+
+export {
+  onLedger,
+}