1
0
mirror of https://github.com/kremalicious/metamask-extension.git synced 2024-12-23 09:52:26 +01:00
metamask-extension/app/scripts/lib/tx-state-history-helper.js

41 lines
1.1 KiB
JavaScript

const jsonDiffer = require('fast-json-patch')
const clone = require('clone')
module.exports = {
generateHistoryEntry,
replayHistory,
snapshotFromTxMeta,
migrateFromSnapshotsToDiffs,
}
function migrateFromSnapshotsToDiffs(longHistory) {
return (
longHistory
// convert non-initial history entries into diffs
.map((entry, index) => {
if (index === 0) return entry
return generateHistoryEntry(longHistory[index - 1], entry)
})
)
}
function generateHistoryEntry(previousState, newState, note) {
const entry = jsonDiffer.compare(previousState, newState)
// Add a note to the first op, since it breaks if we append it to the entry
if (note && entry[0]) entry[0].note = note
return entry
}
function replayHistory(_shortHistory) {
const shortHistory = clone(_shortHistory)
return shortHistory.reduce((val, entry) => jsonDiffer.applyPatch(val, entry).newDocument)
}
function snapshotFromTxMeta(txMeta) {
// create txMeta snapshot for history
const snapshot = clone(txMeta)
// dont include previous history in this snapshot
delete snapshot.history
return snapshot
}