implement HD sweep

lib/postgresql_interface.js

@@ -8,6 +8,7 @@ const backoff = require('u-promised').backoff
 const logger = require('./logger')
 
 const CACHED_SESSION_TTL = 60 * 60 * 1000
+const LIVE_SWEEP_TTL = 48 * 60 * 60 * 1000
 
 let db
 
@@ -441,3 +442,39 @@ exports.nextCashOutSerialHD = function nextCashOutSerialHD (sessionId, cryptoCod
 
   return backoff(100, 0, 5, attempt)
 }
+
+exports.fetchLiveHD = function fetchLiveHD () {
+  const sql = `select * from cash_out_txs, cash_out_hds
+    where cash_out_txs.session_id=cash_out_hds.session_id
+    and status=$1 and swept=$2 and
+    ((extract(epoch from (now() - cash_out_txs.created))) * 1000)<$3`
+
+  const values = ['confirmed', false, LIVE_SWEEP_TTL]
+
+  return db.manyOrNone(sql, values)
+}
+
+exports.fetchOldHD = function fetchLiveHD () {
+  db.one(`select reltuples as approximate_row_count from pg_class where relname = 'cash_out_txs'`)
+  .then(row => {
+    const rowCount = row.approximate_row_count
+
+    const factor = rowCount < 1000
+    ? 10
+    : rowCount < 10000 ? 1 : 0.1
+
+    const sql = `select * from cash_out_txs tablesample system $1,
+      cash_out_hds
+      where cash_out_txs.session_id=cash_out_hds.session_id
+      and status=$2`
+
+    const values = [factor, 'confirmed']
+
+    return db.manyOrNone(sql, values)
+  })
+}
+
+exports.markSwept = function markSwept (sessionId) {
+  const sql = `update cash_out_hds set swept=$1 where session_id=$2`
+  return db.none(sql, [true, sessionId])
+}