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metamask-extension/app/scripts/lib/tx-state-history-helper.js

37 lines
927 B
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) {
return jsonDiffer.compare(previousState, newState)
}
function replayHistory(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
}