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pinafore
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simplify database structure

This commit is contained in:
Nolan Lawson 2018-01-23 09:03:31 -08:00
parent fb2f16f34a
commit 47c058a19f
10 changed files with 112 additions and 220 deletions
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2
routes/_utils/database/cache.js
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@ -1,2 +0,0 @@
export const openReqs = {}
export const databaseCache = {}

57
routes/_utils/database/cleanupTimelines.js
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@ -1,57 +0,0 @@
import { getKnownDbs } from './knownDbs'
import debounce from 'lodash/debounce'
import { TIMELINE_STORE, getTimelineDatabase } from './timelines'
const MAX_NUM_STORED_STATUSES = 1000
const CLEANUP_INTERVAL = 60000
async function cleanup(instanceName, timeline) {
const db = await getTimelineDatabase(instanceName, timeline)
return await new Promise((resolve, reject) => {
const tx = db.transaction(TIMELINE_STORE, 'readwrite')
const store = tx.objectStore(TIMELINE_STORE)
const index = store.index('pinafore_id_as_negative_big_int')
store.count().onsuccess = (e) => {
let count = e.target.result
if (count <= MAX_NUM_STORED_STATUSES) {
return
}
let openKeyCursor = index.openKeyCursor || index.openCursor
openKeyCursor.call(index, null, 'prev').onsuccess = (e) => {
let cursor = e.target.result
if (--count < MAX_NUM_STORED_STATUSES || !cursor) {
return
}
store.delete(cursor.primaryKey).onsuccess = () => {
cursor.continue()
}
}
}
tx.oncomplete = () => resolve()
tx.onerror = () => reject(tx.error.name + ' ' + tx.error.message)
})
}
export const cleanupOldStatuses = debounce(async () => {
if (process.env.NODE_ENV !== 'production') {
console.log('cleanupOldStatuses')
}
let knownDbs = await getKnownDbs()
let instanceNames = Object.keys(knownDbs)
for (let instanceName of instanceNames) {
let knownDbsForInstance = knownDbs[instanceName] || []
for (let knownDb of knownDbsForInstance) {
let {type, dbName} = knownDb
if (type !== 'timeline') {
continue
}
let timeline = dbName.split('_').slice(-1)[0]
await cleanup(instanceName, timeline)
}
}
if (process.env.NODE_ENV !== 'production') {
console.log('done cleanupOldStatuses')
}
}, CLEANUP_INTERVAL)

3
routes/_utils/database/constants.js Normal file
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@ -0,0 +1,3 @@
export const STATUSES_STORE = 'statuses'
export const TIMELINE_STORE = 'timelines'
export const META_STORE = 'meta'

76
routes/_utils/database/databaseCore.js
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@ -1,34 +1,59 @@
import { META_STORE, getMetaDatabase } from './meta'
import { cleanupOldStatuses } from './cleanupTimelines'
import { TIMELINE_STORE, getTimelineDatabase } from './timelines'
import { toReversePaddedBigInt, transformStatusForStorage, dbPromise, deleteDbPromise } from './utils'
import { getKnownDbsForInstance, deleteInstanceFromKnownDbs } from './knownDbs'
import {
toReversePaddedBigInt
} from './utils'
import {
getDatabase,
dbPromise,
deleteDatabase,
} from './databaseLifecycle'
import {
META_STORE,
TIMELINE_STORE,
STATUSES_STORE
} from './constants'
export async function getTimeline(instanceName, timeline, maxId = null, limit = 20) {
const db = await getTimelineDatabase(instanceName, timeline)
return await dbPromise(db, TIMELINE_STORE, 'readonly', (store, callback) => {
const index = store.index('pinafore_id_as_negative_big_int')
let sinceAsNegativeBigInt = maxId ? toReversePaddedBigInt(maxId) : null
let query = sinceAsNegativeBigInt ? IDBKeyRange.lowerBound(sinceAsNegativeBigInt, false) : null
const db = await getDatabase(instanceName, timeline)
return await dbPromise(db, [TIMELINE_STORE, STATUSES_STORE], 'readonly', (stores, callback) => {
let [ timelineStore, statusesStore ] = stores
index.getAll(query, limit).onsuccess = (e) => {
callback(e.target.result)
let negBigInt = maxId && toReversePaddedBigInt(maxId)
let start = negBigInt ? (timeline + '\u0000' + negBigInt) : (timeline + '\u0000')
let end = timeline + '\u0000\uffff'
let query = IDBKeyRange.bound(start, end, false, false)
timelineStore.getAll(query, limit).onsuccess = e => {
let timelineResults = e.target.result
let res = new Array(timelineResults.length)
timelineResults.forEach((timelineResult, i) => {
statusesStore.get(timelineResult.statusId).onsuccess = e => {
res[i] = e.target.result
}
})
callback(res)
}
})
}
export async function insertStatuses(instanceName, timeline, statuses) {
const db = await getTimelineDatabase(instanceName, timeline)
await dbPromise(db, TIMELINE_STORE, 'readwrite', (store) => {
const db = await getDatabase(instanceName, timeline)
await dbPromise(db, [TIMELINE_STORE, STATUSES_STORE], 'readwrite', (stores) => {
let [ timelineStore, statusesStore ] = stores
for (let status of statuses) {
store.put(transformStatusForStorage(status))
statusesStore.put(status)
// reverse chronological order, prefixed by timeline
let id = timeline + '\u0000' + toReversePaddedBigInt(status.id)
timelineStore.put({
id: id,
statusId: status.id
})
}
})
/* no await */ cleanupOldStatuses()
}
export async function getInstanceVerifyCredentials(instanceName) {
const db = await getMetaDatabase(instanceName)
const db = await getDatabase(instanceName)
return await dbPromise(db, META_STORE, 'readonly', (store, callback) => {
store.get('verifyCredentials').onsuccess = (e) => {
callback(e.target.result && e.target.result.value)
@ -37,7 +62,7 @@ export async function getInstanceVerifyCredentials(instanceName) {
}
export async function setInstanceVerifyCredentials(instanceName, verifyCredentials) {
const db = await getMetaDatabase(instanceName)
const db = await getDatabase(instanceName)
return await dbPromise(db, META_STORE, 'readwrite', (store) => {
store.put({
key: 'verifyCredentials',
@ -46,17 +71,6 @@ export async function setInstanceVerifyCredentials(instanceName, verifyCredentia
})
}
export async function clearDatabasesForInstance(instanceName) {
console.log('clearDatabasesForInstance', instanceName)
const knownDbsForInstance = await getKnownDbsForInstance(instanceName)
for (let knownDb of knownDbsForInstance) {
let { dbName } = knownDb
try {
await deleteDbPromise(dbName)
console.error(`deleted database ${dbName}`)
} catch (e) {
console.error(`failed to delete database ${dbName}`)
}
}
await deleteInstanceFromKnownDbs(instanceName)
export async function clearDatabaseForInstance(instanceName) {
await deleteDatabase(instanceName)
}

63
routes/_utils/database/databaseLifecycle.js Normal file
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@ -0,0 +1,63 @@
const openReqs = {}
const databaseCache = {}
import {
META_STORE,
TIMELINE_STORE,
STATUSES_STORE
} from './constants'
export function getDatabase(instanceName) {
if (databaseCache[instanceName]) {
return Promise.resolve(databaseCache[instanceName])
}
databaseCache[instanceName] = new Promise((resolve, reject) => {
let req = indexedDB.open(instanceName, 1)
openReqs[instanceName] = req
req.onerror = reject
req.onblocked = () => {
console.log('idb blocked')
}
req.onupgradeneeded = () => {
let db = req.result;
db.createObjectStore(META_STORE, {keyPath: 'key'})
db.createObjectStore(STATUSES_STORE, {keyPath: 'id'})
let timelineStore = db.createObjectStore(TIMELINE_STORE, {keyPath: 'id'})
timelineStore.createIndex('statusId', 'statusId')
}
req.onsuccess = () => resolve(req.result)
})
return databaseCache[instanceName]
}
export async function dbPromise(db, storeName, readOnlyOrReadWrite, cb) {
return await new Promise((resolve, reject) => {
const tx = db.transaction(storeName, readOnlyOrReadWrite)
let store = typeof storeName === 'string' ?
tx.objectStore(storeName) :
storeName.map(name => tx.objectStore(name))
let res
cb(store, (result) => {
res = result
})
tx.oncomplete = () => resolve(res)
tx.onerror = () => reject(tx.error.name + ' ' + tx.error.message)
})
}
export function deleteDatabase(instanceName) {
return new Promise((resolve, reject) => {
// close any open requests
let openReq = openReqs[instanceName];
if (openReq && openReq.result) {
openReq.result.close()
}
delete openReqs[instanceName]
delete databaseCache[instanceName]
let req = indexedDB.deleteDatabase(instanceName)
req.onsuccess = () => resolve()
req.onerror = () => reject(req.error.name + ' ' + req.error.message)
})
}

27
routes/_utils/database/knownDbs.js
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@ -1,27 +0,0 @@
import keyval from "idb-keyval"
export async function addKnownDb(instanceName, type, dbName) {
let knownDbs = (await getKnownDbs())
if (!knownDbs[instanceName]) {
knownDbs[instanceName] = []
}
if (!knownDbs[instanceName].some(db => db.type === type && db.dbName === dbName)) {
knownDbs[instanceName].push({type, dbName})
}
await keyval.set('known_dbs', knownDbs)
}
export async function getKnownDbs() {
return (await keyval.get('known_dbs')) || {}
}
export async function getKnownDbsForInstance(instanceName) {
let knownDbs = await getKnownDbs()
return knownDbs[instanceName] || []
}
export async function deleteInstanceFromKnownDbs(instanceName) {
let knownDbs = await getKnownDbs()
delete knownDbs[instanceName]
await keyval.set('known_dbs', knownDbs)
}

28
routes/_utils/database/meta.js
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@ -1,28 +0,0 @@
import { addKnownDb } from './knownDbs'
import { openReqs, databaseCache } from './cache'
export const META_STORE = 'meta'
export function getMetaDatabase(instanceName) {
const dbName = `${instanceName}_${META_STORE}`
if (databaseCache[dbName]) {
return Promise.resolve(databaseCache[dbName])
}
addKnownDb(instanceName, 'meta', dbName)
databaseCache[dbName] = new Promise((resolve, reject) => {
let req = indexedDB.open(dbName, 1)
openReqs[dbName] = req
req.onerror = reject
req.onblocked = () => {
console.log('idb blocked')
}
req.onupgradeneeded = () => {
let db = req.result;
db.createObjectStore(META_STORE, {keyPath: 'key'})
}
req.onsuccess = () => resolve(req.result)
})
return databaseCache[dbName]
}

36
routes/_utils/database/timelines.js
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@ -1,36 +0,0 @@
import { addKnownDb } from './knownDbs'
import { openReqs, databaseCache } from './cache'
export const TIMELINE_STORE = 'statuses'
export function createTimelineDbName(instanceName, timeline) {
return `${instanceName}_timeline_${timeline}`
}
export function getTimelineDatabase(instanceName, timeline) {
let dbName = createTimelineDbName(instanceName, timeline)
if (databaseCache[dbName]) {
return Promise.resolve(databaseCache[dbName])
}
addKnownDb(instanceName, 'timeline', dbName)
databaseCache[dbName] = new Promise((resolve, reject) => {
let req = indexedDB.open(dbName, 1)
openReqs[dbName] = req
req.onerror = reject
req.onblocked = () => {
console.log('idb blocked')
}
req.onupgradeneeded = () => {
let db = req.result;
let oStore = db.createObjectStore(TIMELINE_STORE, {
keyPath: 'id'
})
oStore.createIndex('pinafore_id_as_negative_big_int', 'pinafore_id_as_negative_big_int')
}
req.onsuccess = () => resolve(req.result)
})
return databaseCache[dbName]
}

38
routes/_utils/database/utils.js
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@ -1,6 +1,4 @@
import cloneDeep from 'lodash/cloneDeep'
import padStart from 'lodash/padStart'
import { databaseCache, openReqs } from './cache'
export function toPaddedBigInt (id) {
return padStart(id, 30, '0')
@ -13,40 +11,4 @@ export function toReversePaddedBigInt (id) {
res += (9 - parseInt(bigInt.charAt(i), 10)).toString(10)
}
return res
}
export function transformStatusForStorage (status) {
status = cloneDeep(status)
status.pinafore_id_as_negative_big_int = toReversePaddedBigInt(status.id)
status.pinafore_stale = true
return status
}
export async function dbPromise(db, storeName, readOnlyOrReadWrite, cb) {
return await new Promise((resolve, reject) => {
const tx = db.transaction(storeName, readOnlyOrReadWrite)
const store = tx.objectStore(storeName)
let res
cb(store, (result) => {
res = result
})
tx.oncomplete = () => resolve(res)
tx.onerror = () => reject(tx.error.name + ' ' + tx.error.message)
})
}
export function deleteDbPromise(dbName) {
return new Promise((resolve, reject) => {
// close any open requests
let openReq = openReqs[dbName];
if (openReq && openReq.result) {
openReq.result.close()
}
delete openReqs[dbName]
delete databaseCache[dbName]
let req = indexedDB.deleteDatabase(dbName)
req.onsuccess = () => resolve()
req.onerror = () => reject(req.error.name + ' ' + req.error.message)
})
}

2
routes/settings/instances/[instanceName].html
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@ -174,7 +174,7 @@
currentInstance: newInstance
})
this.store.save()
database.clearDatabasesForInstance(instanceName)
database.clearDatabaseForInstance(instanceName)
switchToTheme(instanceThemes[newInstance] || 'default')
toast.say(`Logged out of ${instanceName}`)
goto('/settings/instances')