Store eligible transactions

lib/onTransaction.mjs

@@ -0,0 +1,59 @@
+import { writeFile } from 'fs'
+import { dirExists } from './dirExists.mjs'
+import { ledgerIndexToFolders } from './ledgerIndexToFolders.mjs'
+import 'dotenv/config'
+
+const lastSeenTransactions = []
+
+const fields = (process.env?.FIELDSREQUIRED || '')
+  .split(',')
+  .map(f => f.trim())
+  .filter(f => f.match(/^[a-zA-Z0-9]+$/))
+
+const fieldsRequired = fields.length === 1 && fields[0] === ''
+  ? [ 'Fee' ]
+  : fields
+
+const hasRequiredFields = tx => fieldsRequired.map(f => Object.keys(tx).includes(f)).every(f => !!f)
+
+/**
+ * TODO: FIELDSREQUIRED ENV VAR (so: decode tx) - if empty store all
+ *       » Store transactions
+ *       » Generate xPOP
+ */
+
+const onTransaction = async ({
+  networkId,
+  transaction,
+}) => {
+  if (transaction?.validated) {
+    const { transaction: tx } = transaction
+
+    if (tx.hash && lastSeenTransactions.indexOf(tx.hash) < 0) {
+      lastSeenTransactions.unshift(tx.hash)
+      lastSeenTransactions.length = 3000
+
+      const validTx = hasRequiredFields(tx)
+      console.log('TX', tx.hash, validTx)
+
+      if (validTx && transaction?.ledger_index) {
+        const relativeStorDir = 'store/' + networkId + '/' + ledgerIndexToFolders(transaction.ledger_index)
+        const storeDir = new URL('../' + relativeStorDir, import.meta.url).pathname
+        
+        console.log('xPOP eligible', relativeStorDir, transaction)
+
+        if (await dirExists(storeDir)) {
+          writeFile(storeDir + '/tx_' + tx.hash + '.json', Buffer.from(JSON.stringify(transaction), 'utf8'), err => {
+            if (err) {
+              console.log('Error writing file @ ' + storeDir)
+            }
+          })
+        }
+      }
+    }
+  }
+}
+
+export {
+  onTransaction,
+}