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import { toRaw } from 'vue'
import { isEqual, cloneDeep } from 'lodash'
import { CURRENT_UPDATE_COUNTER } from 'src/components/update_notification/update_notification.js'
export const VERSION = 1
export const NEW_USER_DATE = new Date('2022-08-04') // date of writing this, basically
export const COMMAND_TRIM_FLAGS = 1000
export const COMMAND_TRIM_FLAGS_AND_RESET = 1001
export const defaultState = {
// do we need to update data on server?
dirty: false,
// storage of flags - stuff that can only be set and incremented
flagStorage: {
updateCounter: 0, // Counter for most recent update notification seen
// TODO move to prefsStorage when that becomes a thing since only way
// this can be reset is by complete reset of all flags
dontShowUpdateNotifs: 0, // if user chose to not show update notifications ever again
reset: 0 // special flag that can be used to force-reset all flags, debug purposes only
// special reset codes:
// 1000: trim keys to those known by currently running FE
// 1001: same as above + reset everything to 0
},
// raw data
raw: null,
// local cache
cache: null
}
export const newUserFlags = {
...defaultState.flagStorage,
updateCounter: CURRENT_UPDATE_COUNTER // new users don't need to see update notification
}
const _wrapData = (data) => ({
...data,
_timestamp: Date.now(),
_version: VERSION
})
const _checkValidity = (data) => data._timestamp > 0 && data._version > 0
export const _getRecentData = (cache, live) => {
const result = { recent: null, stale: null, needUpload: false }
const cacheValid = _checkValidity(cache || {})
const liveValid = _checkValidity(live || {})
if (!liveValid && cacheValid) {
result.needUpload = true
console.debug('Nothing valid stored on server, assuming cache to be source of truth')
result.recent = cache
result.stale = live
} else if (!cacheValid && liveValid) {
console.debug('Valid storage on server found, no local cache found, using live as source of truth')
result.recent = live
result.stale = cache
} else if (cacheValid && liveValid) {
console.debug('Both sources have valid data, figuring things out...')
if (live._timestamp === cache._timestamp && live._version === cache._version) {
console.debug('Same version/timestamp on both source, source of truth irrelevant')
result.recent = cache
result.stale = live
} else {
console.debug('Different timestamp, figuring out which one is more recent')
if (live._timestamp < cache._timestamp) {
result.recent = cache
result.stale = live
} else {
result.recent = live
result.stale = cache
}
}
} else {
console.debug('Both sources are invalid, start from scratch')
result.needUpload = true
}
return result
}
export const _getAllFlags = (recent, stale) => {
return Array.from(new Set([
...Object.keys(toRaw((recent || {}).flagStorage || {})),
...Object.keys(toRaw((stale || {}).flagStorage || {}))
]))
}
export const _mergeFlags = (recent, stale, allFlagKeys) => {
return Object.fromEntries(allFlagKeys.map(flag => {
const recentFlag = recent.flagStorage[flag]
const staleFlag = stale.flagStorage[flag]
// use flag that is of higher value
return [flag, Number((recentFlag > staleFlag ? recentFlag : staleFlag) || 0)]
}))
}
export const _resetFlags = (totalFlags, knownKeys = defaultState.flagStorage) => {
let result = { ...totalFlags }
const allFlagKeys = Object.keys(totalFlags)
// flag reset functionality
if (totalFlags.reset >= COMMAND_TRIM_FLAGS && totalFlags.reset <= COMMAND_TRIM_FLAGS_AND_RESET) {
console.debug('Received command to trim the flags')
const knownKeysSet = new Set(Object.keys(knownKeys))
// Trim
result = {}
allFlagKeys.forEach(flag => {
if (knownKeysSet.has(flag)) {
result[flag] = totalFlags[flag]
}
})
// Reset
if (totalFlags.reset === COMMAND_TRIM_FLAGS_AND_RESET) {
// 1001 - and reset everything to 0
console.debug('Received command to reset the flags')
Object.keys(knownKeys).forEach(flag => { result[flag] = 0 })
}
} else if (totalFlags.reset > 0 && totalFlags.reset < 9000) {
console.debug('Received command to reset the flags')
allFlagKeys.forEach(flag => { result[flag] = 0 })
}
result.reset = 0
return result
}
export const _doMigrations = (cache) => {
if (!cache) return cache
if (cache._version < VERSION) {
console.debug('Local cached data has older version, seeing if there any migrations that can be applied')
// no migrations right now since we only have one version
console.debug('No migrations found')
}
if (cache._version > VERSION) {
console.debug('Local cached data has newer version, seeing if there any reverse migrations that can be applied')
// no reverse migrations right now but we leave a possibility of loading a hotpatch if need be
if (window._PLEROMA_HOTPATCH) {
if (window._PLEROMA_HOTPATCH.reverseMigrations) {
console.debug('Found hotpatch migration, applying')
return window._PLEROMA_HOTPATCH.reverseMigrations.call({}, 'serverSideStorage', { from: cache._version, to: VERSION }, cache)
}
}
}
return cache
}
export const mutations = {
setServerSideStorage (state, userData) {
const live = userData.storage
state.raw = live
let cache = state.cache
cache = _doMigrations(cache)
let { recent, stale, needsUpload } = _getRecentData(cache, live)
const userNew = userData.created_at > NEW_USER_DATE
const flagsTemplate = userNew ? newUserFlags : defaultState.flagStorage
let dirty = false
if (recent === null) {
console.debug(`Data is empty, initializing for ${userNew ? 'new' : 'existing'} user`)
recent = _wrapData({
flagStorage: { ...flagsTemplate }
})
}
if (!needsUpload && recent && stale) {
console.debug('Checking if data needs merging...')
// discarding timestamps and versions
const { _timestamp: _0, _version: _1, ...recentData } = recent
const { _timestamp: _2, _version: _3, ...staleData } = stale
dirty = !isEqual(recentData, staleData)
console.debug(`Data ${dirty ? 'needs' : 'doesn\'t need'} merging`)
}
const allFlagKeys = _getAllFlags(recent, stale)
let totalFlags
if (dirty) {
// Merge the flags
console.debug('Merging the flags...')
totalFlags = _mergeFlags(recent, stale, allFlagKeys)
} else {
totalFlags = recent.flagStorage
}
totalFlags = _resetFlags(totalFlags)
recent.flagStorage = totalFlags
state.dirty = dirty || needsUpload
state.cache = recent
// set local timestamp to smaller one if we don't have any changes
if (stale && recent && !state.dirty) {
state.cache._timestamp = Math.min(stale._timestamp, recent._timestamp)
}
state.flagStorage = state.cache.flagStorage
},
setFlag (state, { flag, value }) {
state.flagStorage[flag] = value
state.dirty = true
}
}
const serverSideStorage = {
state: {
...cloneDeep(defaultState)
},
mutations,
actions: {
pushServerSideStorage ({ state, rootState, commit }, { force = false } = {}) {
const needPush = state.dirty || force
if (!needPush) return
state.cache = _wrapData({
flagStorage: toRaw(state.flagStorage)
})
const params = { pleroma_settings_store: { 'pleroma-fe': state.cache } }
rootState.api.backendInteractor
.updateProfile({ params })
.then((user) => commit('setServerSideStorage', user))
state.dirty = false
}
}
}
export default serverSideStorage
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