diff --git a/app/scripts/migrations/018.js b/app/scripts/migrations/018.js new file mode 100644 index 000000000..c8d2332ab --- /dev/null +++ b/app/scripts/migrations/018.js @@ -0,0 +1,52 @@ +const version = 18 + +/* + +This migration updates "transaction state history" to diffs style + +*/ + +const clone = require('clone') +const txStateHistoryHelper = require('../tx-state-history-helper') + + +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 + newState.TransactionController.transactions = transactions.map((txMeta) => { + // no history: initialize + if (!txMeta.history || tx.history.length === 0) { + const snapshot = txStateHistoryHelper.snapshotFromTxMeta(txMeta) + txMeta.history = [snapshot] + return txMeta + } + // has history: migrate + const newHistory = ( + txStateHistoryHelper.migrateFromSnapshotsToDiffs(txMeta.history) + // remove empty diffs + .filter((entry) => { + return !Array.isArray(entry) || entry.length > 0 + }) + ) + txMeta.history = newHistory + return txMeta + }) + return newState +}