migration for removing unnecessary transactions from state

2 files changed, 52 insertions, 0 deletions

diff --git a/app/scripts/migrations/023.js b/app/scripts/migrations/023.js
new file mode 100644
index 000000000..bce0a5bea
--- /dev/null
+++ b/app/scripts/migrations/023.js
@@ -0,0 +1,50 @@
+
+const version = 23
+
+/*
+
+This migration removes transactions that are no longer usefull down to 40 total
+
+*/
+
+const clone = require('clone')
+
+module.exports = {
+  version,
+
+  migrate: function (originalVersionedData) {
+    const versionedData = clone(originalVersionedData)
+    versionedData.meta.version = version
+    try {
+      const state = versionedData.data
+      const newState = transformState(state)
+      versionedData.data = newState
+    } catch (err) {
+      console.warn(`MetaMask Migration #${version}` + err.stack)
+    }
+    return Promise.resolve(versionedData)
+  },
+}
+
+function transformState (state) {
+  const newState = state
+  const transactions = newState.TransactionController.transactions
+
+  if (transactions.length <= 40) return newState
+
+  let reverseTxList = transactions.reverse()
+  let stripping = true
+  while (reverseTxList.length > 40 && stripping) {
+    let txIndex = reverseTxList.findIndex((txMeta) => {
+      return (txMeta.status === 'failed' ||
+      txMeta.status === 'rejected' ||
+      txMeta.status === 'confirmed' ||
+      txMeta.status === 'dropped')
+    })
+    if (txIndex < 0) stripping = false
+    else reverseTxList.splice(txIndex, 1)
+  }
+
+  newState.TransactionController.transactions = reverseTxList.reverse()
+  return newState
+}
diff --git a/app/scripts/migrations/index.js b/app/scripts/migrations/index.js
index a0cf5f4d4..811e06b6b 100644
--- a/app/scripts/migrations/index.js
+++ b/app/scripts/migrations/index.js
@@ -32,4 +32,6 @@ module.exports = [
   require('./019'),
   require('./020'),
   require('./021'),
+  require('./022'),
+  require('./023'),
 ]