82 lines
1.6 KiB
JavaScript
82 lines
1.6 KiB
JavaScript
const fs = require('fs-extra')
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const { CONSTANTS } = require('./constants')
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/**
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* Returns the current machine's state - either what
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* we have saved or alternatively the default state.
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*
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* @returns {ArrayBuffer}
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*/
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function getState () {
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const statePath = fs.existsSync(CONSTANTS.STATE_PATH)
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? CONSTANTS.STATE_PATH
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: CONSTANTS.DEFAULT_STATE_PATH
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if (fs.existsSync(statePath)) {
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return fs.readFileSync(statePath).buffer
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}
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}
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/**
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* Resets a saved state by simply deleting it.
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*
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* @returns {Promise<void>}
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*/
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async function resetState () {
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if (fs.existsSync(CONSTANTS.STATE_PATH)) {
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return fs.remove(CONSTANTS.STATE_PATH)
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}
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}
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/**
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* Saves the current VM's state.
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*
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* @returns {Promise<void>}
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*/
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async function saveState () {
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return new Promise((resolve) => {
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if (!window.emulator || !window.emulator.save_state) {
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return resolve()
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}
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window.emulator.save_state(async (error, newState) => {
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if (error) {
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console.warn(`State: Could not save state`, error)
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return
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}
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await fs.outputFile(CONSTANTS.STATE_PATH, Buffer.from(newState))
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console.log(`State: Saved state to ${CONSTANTS.STATE_PATH}`)
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resolve()
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})
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})
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}
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/**
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* Restores the VM's state.
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*/
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function restoreState () {
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const state = getState()
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// Nothing to do with if we don't have a state
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if (!state) {
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console.log(`State: No state present, not restoring.`)
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}
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try {
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window.emulator.restore_state(state)
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} catch (error) {
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console.log(`State: Could not read state file. Maybe none exists?`, error)
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}
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}
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module.exports = {
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saveState,
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restoreState,
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resetState,
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getState
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}
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