feat: add transaction batching module

feat: plugin sendCoins batching support
feat: batching processing on poller
feat: mock-wallet batching
fix: bitcoin tx batching
fix: transaction batching db table

lib/tx-batching.js

@@ -0,0 +1,84 @@
+const _ = require('lodash/fp')
+const pgp = require('pg-promise')()
+const uuid = require('uuid')
+
+const db = require('./db')
+const wallet = require('./wallet')
+
+function createTransactionBatch (cryptoCode) {
+  const sql = `INSERT INTO transaction_batches (id, crypto_code) VALUES ($1, $2) RETURNING *`
+
+  return db.one(sql, [uuid.v4(), cryptoCode])
+}
+
+function closeTransactionBatch (batch) {
+  const sql = `UPDATE transaction_batches SET status='ready', closed_at=now() WHERE id=$1`
+
+  return db.none(sql, [batch.id])
+}
+
+function confirmSentBatch (batch) {
+  const sql = `UPDATE transaction_batches SET status='sent', error_message=NULL WHERE id=$1`
+
+  return db.none(sql, [batch.id])
+}
+
+function setErroredBatch (batch, errorMsg) {
+  const sql = `UPDATE transaction_batches SET status='failed', error_message=$1 WHERE id=$2`
+
+  return db.none(sql, [errorMsg, batch.id])
+}
+
+function addTransactionToBatch (tx) {
+  const sql = `SELECT * FROM transaction_batches WHERE crypto_code=$1 AND status='open' ORDER BY created_at DESC LIMIT 1`
+  const sql2 = `UPDATE cash_in_txs SET batch_id=$1 WHERE id=$2`
+
+  return db.oneOrNone(sql, [tx.cryptoCode])
+    .then(batch => {
+      if (_.isNil(batch))
+        return createTransactionBatch(tx.cryptoCode)
+      return Promise.resolve(batch)
+    })
+    .then(batch => db.none(sql2, [batch.id, tx.id]))
+}
+
+function getBatchTransactions (batch) {
+  const sql = `SELECT * FROM cash_in_txs WHERE batch_id=$1`
+  return db.manyOrNone(sql, [batch.id])
+}
+
+function getBatchesByStatus (statuses) {
+  const sql = `SELECT *, EXTRACT(EPOCH FROM (now() - created_at)) as time_elapsed FROM transaction_batches WHERE status in ($1^)`
+
+  return db.manyOrNone(sql, [_.map(pgp.as.text, statuses).join(',')])
+}
+
+function submitBatch (settings, batch) {
+  getBatchTransactions(batch)
+    .then(txs => {
+      wallet.sendCoinsBatch(settings, txs, batch.crypto_code)
+        .then(() => confirmSentBatch(batch))
+        .catch(err => setErroredBatch(batch, err.message))
+    })
+}
+
+function processBatches (settings, lifecycle) {
+  getBatchesByStatus(['open', 'failed'])
+    .then(batches => {
+      _.each(batch => {
+        const elapsedMS = batch.time_elapsed * 1000
+
+        if (elapsedMS >= lifecycle) {
+          return closeTransactionBatch(batch)
+            .then(() => submitBatch(settings, batch))
+        }
+      }, batches)
+    })
+}
+
+module.exports = {
+  createTransactionBatch,
+  closeTransactionBatch,
+  addTransactionToBatch,
+  processBatches
+}