From d599f2f308825b9cd2cc08981224daa93518f1ea Mon Sep 17 00:00:00 2001
From: Nolan Lawson <nolan@nolanlawson.com>
Date: Wed, 29 Aug 2018 19:03:12 -0700
Subject: [PATCH] run idb operations in a web worker (#517)

---
 package-lock.json                             |  39 ++--
 package.json                                  |   2 +
 routes/_actions/accounts.js                   |  18 +-
 routes/_actions/addInstance.js                |   4 +-
 routes/_actions/addStatusOrNotification.js    |   6 +-
 routes/_actions/compose.js                    |   4 +-
 routes/_actions/deleteStatuses.js             |   6 +-
 routes/_actions/emoji.js                      |   9 +-
 routes/_actions/favorite.js                   |   6 +-
 routes/_actions/instances.js                  |  18 +-
 routes/_actions/lists.js                      |   9 +-
 routes/_actions/muteConversation.js           |   4 +-
 routes/_actions/pin.js                        |   4 +-
 routes/_actions/pinnedStatuses.js             |   9 +-
 routes/_actions/reblog.js                     |   4 +-
 routes/_actions/statuses.js                   |  14 +-
 routes/_actions/timeline.js                   |  13 +-
 routes/_components/timeline/Timeline.html     |   9 +-
 routes/_database/accounts.js                  |   3 +-
 routes/_database/cache.js                     |   2 +-
 routes/_database/cleanup.js                   |  14 +-
 routes/_database/database.dev.js              |   3 +
 routes/_database/database.js                  |   7 +
 routes/_database/databaseLifecycle.js         |   5 +-
 routes/_database/databaseWorker.js            | 187 ++++++++++++++++++
 routes/_database/knownInstances.js            |  17 ++
 routes/_database/timelines/pagination.js      |   4 +-
 .../_store/observers/autosuggestObservers.js  |   6 +-
 routes/_utils/marks.js                        |   2 +-
 webpack.client.config.js                      |  12 ++
 30 files changed, 316 insertions(+), 124 deletions(-)
 create mode 100644 routes/_database/database.dev.js
 create mode 100644 routes/_database/database.js
 create mode 100644 routes/_database/databaseWorker.js
 create mode 100644 routes/_database/knownInstances.js

diff --git a/package-lock.json b/package-lock.json
index db4b753..c2f62fc 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -2243,13 +2243,11 @@
             },
             "balanced-match": {
               "version": "1.0.0",
-              "bundled": true,
-              "optional": true
+              "bundled": true
             },
             "brace-expansion": {
               "version": "1.1.11",
               "bundled": true,
-              "optional": true,
               "requires": {
                 "balanced-match": "1.0.0",
                 "concat-map": "0.0.1"
@@ -2262,18 +2260,15 @@
             },
             "code-point-at": {
               "version": "1.1.0",
-              "bundled": true,
-              "optional": true
+              "bundled": true
             },
             "concat-map": {
               "version": "0.0.1",
-              "bundled": true,
-              "optional": true
+              "bundled": true
             },
             "console-control-strings": {
               "version": "1.1.0",
-              "bundled": true,
-              "optional": true
+              "bundled": true
             },
             "core-util-is": {
               "version": "1.0.2",
@@ -2376,8 +2371,7 @@
             },
             "inherits": {
               "version": "2.0.3",
-              "bundled": true,
-              "optional": true
+              "bundled": true
             },
             "ini": {
               "version": "1.3.5",
@@ -2387,7 +2381,6 @@
             "is-fullwidth-code-point": {
               "version": "1.0.0",
               "bundled": true,
-              "optional": true,
               "requires": {
                 "number-is-nan": "1.0.1"
               }
@@ -2400,15 +2393,13 @@
             "minimatch": {
               "version": "3.0.4",
               "bundled": true,
-              "optional": true,
               "requires": {
                 "brace-expansion": "1.1.11"
               }
             },
             "minimist": {
               "version": "0.0.8",
-              "bundled": true,
-              "optional": true
+              "bundled": true
             },
             "minipass": {
               "version": "2.2.4",
@@ -2429,7 +2420,6 @@
             "mkdirp": {
               "version": "0.5.1",
               "bundled": true,
-              "optional": true,
               "requires": {
                 "minimist": "0.0.8"
               }
@@ -2502,8 +2492,7 @@
             },
             "number-is-nan": {
               "version": "1.0.1",
-              "bundled": true,
-              "optional": true
+              "bundled": true
             },
             "object-assign": {
               "version": "4.1.1",
@@ -2618,7 +2607,6 @@
             "string-width": {
               "version": "1.0.2",
               "bundled": true,
-              "optional": true,
               "requires": {
                 "code-point-at": "1.1.0",
                 "is-fullwidth-code-point": "1.0.0",
@@ -6697,6 +6685,11 @@
         "postcss": "^6.0.1"
       }
     },
+    "idb-keyval": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/idb-keyval/-/idb-keyval-3.1.0.tgz",
+      "integrity": "sha512-iFwFN5n00KNNnVxlOOK280SJJfXWY7pbMUOQXdIXehvvc/mGCV/6T2Ae+Pk2KwAkkATDTwfMavOiDH5lrJKWXQ=="
+    },
     "ieee754": {
       "version": "1.1.12",
       "resolved": "https://registry.npmjs.org/ieee754/-/ieee754-1.1.12.tgz",
@@ -12594,6 +12587,14 @@
         "errno": "~0.1.7"
       }
     },
+    "workerize-loader": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/workerize-loader/-/workerize-loader-1.0.4.tgz",
+      "integrity": "sha512-HMTr/zpuZhm8dbhcK52cMYmn57uf7IJeMZJil+5lL/vC5+AO9wzxZ0FISkGVj78No7HcpaINwAWHGCYx3dnsTw==",
+      "requires": {
+        "loader-utils": "^1.1.0"
+      }
+    },
     "wrap-ansi": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
diff --git a/package.json b/package.json
index c4d47ad..26da081 100644
--- a/package.json
+++ b/package.json
@@ -66,6 +66,7 @@
     "form-data": "^2.3.2",
     "glob": "^7.1.2",
     "helmet": "^3.13.0",
+    "idb-keyval": "^3.1.0",
     "indexeddb-getall-shim": "^1.3.5",
     "intersection-observer": "^0.5.0",
     "lodash-es": "^4.17.10",
@@ -98,6 +99,7 @@
     "web-animations-js": "^2.3.1",
     "webpack": "^4.17.1",
     "webpack-bundle-analyzer": "^2.13.1",
+    "workerize-loader": "^1.0.4",
     "yargs": "^12.0.1"
   },
   "devDependencies": {
diff --git a/routes/_actions/accounts.js b/routes/_actions/accounts.js
index 4bffe9e..dc2ec9e 100644
--- a/routes/_actions/accounts.js
+++ b/routes/_actions/accounts.js
@@ -1,18 +1,12 @@
 import { getAccount } from '../_api/user'
 import { getRelationship } from '../_api/relationships'
-import {
-  getAccount as getAccountFromDatabase,
-  setAccount as setAccountInDatabase} from '../_database/accounts'
-import {
-  getRelationship as getRelationshipFromDatabase,
-  setRelationship as setRelationshipInDatabase
-} from '../_database/relationships'
+import { database } from '../_database/database'
 import { store } from '../_store/store'
 
 async function _updateAccount (accountId, instanceName, accessToken) {
-  let localPromise = getAccountFromDatabase(instanceName, accountId)
+  let localPromise = database.getAccount(instanceName, accountId)
   let remotePromise = getAccount(instanceName, accessToken, accountId).then(account => {
-    /* no await */ setAccountInDatabase(instanceName, account)
+    /* no await */ database.setAccount(instanceName, account)
     return account
   })
 
@@ -29,9 +23,9 @@ async function _updateAccount (accountId, instanceName, accessToken) {
 }
 
 async function _updateRelationship (accountId, instanceName, accessToken) {
-  let localPromise = getRelationshipFromDatabase(instanceName, accountId)
+  let localPromise = database.getRelationship(instanceName, accountId)
   let remotePromise = getRelationship(instanceName, accessToken, accountId).then(relationship => {
-    /* no await */ setRelationshipInDatabase(instanceName, relationship)
+    /* no await */ database.setRelationship(instanceName, relationship)
     return relationship
   })
   try {
@@ -47,7 +41,7 @@ async function _updateRelationship (accountId, instanceName, accessToken) {
 }
 
 export async function updateLocalRelationship (instanceName, accountId, relationship) {
-  await setRelationshipInDatabase(instanceName, relationship)
+  await database.setRelationship(instanceName, relationship)
   try {
     store.set({currentAccountRelationship: relationship})
   } catch (e) {
diff --git a/routes/_actions/addInstance.js b/routes/_actions/addInstance.js
index f64e1d7..b7a3789 100644
--- a/routes/_actions/addInstance.js
+++ b/routes/_actions/addInstance.js
@@ -5,7 +5,7 @@ import { switchToTheme } from '../_utils/themeEngine'
 import { store } from '../_store/store'
 import { updateVerifyCredentialsForInstance } from './instances'
 import { updateCustomEmojiForInstance } from './emoji'
-import { setInstanceInfo as setInstanceInfoInDatabase } from '../_database/meta'
+import { database } from '../_database/database'
 
 const REDIRECT_URI = (typeof location !== 'undefined'
   ? location.origin : 'https://pinafore.social') + '/settings/instances/add'
@@ -19,7 +19,7 @@ async function redirectToOauth () {
   }
   let registrationPromise = registerApplication(instanceNameInSearch, REDIRECT_URI)
   let instanceInfo = await getInstanceInfo(instanceNameInSearch)
-  await setInstanceInfoInDatabase(instanceNameInSearch, instanceInfo) // cache for later
+  await database.setInstanceInfo(instanceNameInSearch, instanceInfo) // cache for later
   let instanceData = await registrationPromise
   store.set({
     currentRegisteredInstanceName: instanceNameInSearch,
diff --git a/routes/_actions/addStatusOrNotification.js b/routes/_actions/addStatusOrNotification.js
index 06a6564..ba12ae2 100644
--- a/routes/_actions/addStatusOrNotification.js
+++ b/routes/_actions/addStatusOrNotification.js
@@ -4,9 +4,7 @@ import { store } from '../_store/store'
 import uniqBy from 'lodash-es/uniqBy'
 import uniq from 'lodash-es/uniq'
 import isEqual from 'lodash-es/isEqual'
-import {
-  insertTimelineItems as insertTimelineItemsInDatabase
-} from '../_database/timelines/insertion'
+import { database } from '../_database/database'
 import { runMediumPriorityTask } from '../_utils/runMediumPriorityTask'
 
 const STREAMING_THROTTLE_DELAY = 3000
@@ -29,7 +27,7 @@ async function insertUpdatesIntoTimeline (instanceName, timelineName, updates) {
     return
   }
 
-  await insertTimelineItemsInDatabase(instanceName, timelineName, updates)
+  await database.insertTimelineItems(instanceName, timelineName, updates)
 
   let itemIdsToAdd = store.getForTimeline(instanceName, timelineName, 'itemIdsToAdd') || []
   let newItemIdsToAdd = uniq([].concat(itemIdsToAdd).concat(updates.map(_ => _.id)))
diff --git a/routes/_actions/compose.js b/routes/_actions/compose.js
index 82e5565..1bc69e0 100644
--- a/routes/_actions/compose.js
+++ b/routes/_actions/compose.js
@@ -2,13 +2,13 @@ import { store } from '../_store/store'
 import { toast } from '../_utils/toast'
 import { postStatus as postStatusToServer } from '../_api/statuses'
 import { addStatusOrNotification } from './addStatusOrNotification'
-import { getStatus as getStatusFromDatabase } from '../_database/timelines/getStatusOrNotification'
+import { database } from '../_database/database'
 import { emit } from '../_utils/eventBus'
 import { putMediaDescription } from '../_api/media'
 
 export async function insertHandleForReply (statusId) {
   let { currentInstance } = store.get()
-  let status = await getStatusFromDatabase(currentInstance, statusId)
+  let status = await database.getStatus(currentInstance, statusId)
   let { currentVerifyCredentials } = store.get()
   let originalStatus = status.reblog || status
   let accounts = [originalStatus.account].concat(originalStatus.mentions || [])
diff --git a/routes/_actions/deleteStatuses.js b/routes/_actions/deleteStatuses.js
index cff6bd6..0ce6eed 100644
--- a/routes/_actions/deleteStatuses.js
+++ b/routes/_actions/deleteStatuses.js
@@ -2,9 +2,7 @@ import { getIdsThatRebloggedThisStatus, getNotificationIdsForStatuses } from './
 import { store } from '../_store/store'
 import { scheduleIdleTask } from '../_utils/scheduleIdleTask'
 import isEqual from 'lodash-es/isEqual'
-import {
-  deleteStatusesAndNotifications as deleteStatusesAndNotificationsFromDatabase
-} from '../_database/timelines/deletion'
+import { database } from '../_database/database'
 
 function filterItemIdsFromTimelines (instanceName, timelineFilter, idFilter) {
   let keys = ['timelineItemIds', 'itemIdsToAdd']
@@ -45,7 +43,7 @@ function deleteNotificationIdsFromStore (instanceName, idsToDelete) {
 async function deleteStatusesAndNotifications (instanceName, statusIdsToDelete, notificationIdsToDelete) {
   deleteStatusIdsFromStore(instanceName, statusIdsToDelete)
   deleteNotificationIdsFromStore(instanceName, notificationIdsToDelete)
-  await deleteStatusesAndNotificationsFromDatabase(instanceName, statusIdsToDelete, notificationIdsToDelete)
+  await database.deleteStatusesAndNotifications(instanceName, statusIdsToDelete, notificationIdsToDelete)
 }
 
 async function doDeleteStatus (instanceName, statusId) {
diff --git a/routes/_actions/emoji.js b/routes/_actions/emoji.js
index 7877bfe..83122a0 100644
--- a/routes/_actions/emoji.js
+++ b/routes/_actions/emoji.js
@@ -1,16 +1,13 @@
 import { cacheFirstUpdateAfter } from '../_utils/sync'
-import {
-  getCustomEmoji as getCustomEmojiFromDatabase,
-  setCustomEmoji as setCustomEmojiInDatabase
-} from '../_database/meta'
+import { database } from '../_database/database'
 import { getCustomEmoji } from '../_api/emoji'
 import { store } from '../_store/store'
 
 export async function updateCustomEmojiForInstance (instanceName) {
   await cacheFirstUpdateAfter(
     () => getCustomEmoji(instanceName),
-    () => getCustomEmojiFromDatabase(instanceName),
-    emoji => setCustomEmojiInDatabase(instanceName, emoji),
+    () => database.getCustomEmoji(instanceName),
+    emoji => database.setCustomEmoji(instanceName, emoji),
     emoji => {
       let { customEmoji } = store.get()
       customEmoji[instanceName] = emoji
diff --git a/routes/_actions/favorite.js b/routes/_actions/favorite.js
index d667b88..581f8d8 100644
--- a/routes/_actions/favorite.js
+++ b/routes/_actions/favorite.js
@@ -1,9 +1,7 @@
 import { favoriteStatus, unfavoriteStatus } from '../_api/favorite'
 import { store } from '../_store/store'
 import { toast } from '../_utils/toast'
-import {
-  setStatusFavorited as setStatusFavoritedInDatabase
-} from '../_database/timelines/updateStatus'
+import { database } from '../_database/database'
 
 export async function setFavorited (statusId, favorited) {
   let { online } = store.get()
@@ -18,7 +16,7 @@ export async function setFavorited (statusId, favorited) {
   store.setStatusFavorited(currentInstance, statusId, favorited) // optimistic update
   try {
     await networkPromise
-    await setStatusFavoritedInDatabase(currentInstance, statusId, favorited)
+    await database.setStatusFavorited(currentInstance, statusId, favorited)
   } catch (e) {
     console.error(e)
     toast.say(`Failed to ${favorited ? 'favorite' : 'unfavorite'}. ` + (e.message || ''))
diff --git a/routes/_actions/instances.js b/routes/_actions/instances.js
index 377fb77..4204425 100644
--- a/routes/_actions/instances.js
+++ b/routes/_actions/instances.js
@@ -5,13 +5,7 @@ import { toast } from '../_utils/toast'
 import { goto } from 'sapper/runtime.js'
 import { cacheFirstUpdateAfter } from '../_utils/sync'
 import { getInstanceInfo } from '../_api/instance'
-import { clearDatabaseForInstance } from '../_database/clear'
-import {
-  getInstanceVerifyCredentials as getInstanceVerifyCredentialsFromDatabase,
-  setInstanceVerifyCredentials as setInstanceVerifyCredentialsInDatabase,
-  getInstanceInfo as getInstanceInfoFromDatabase,
-  setInstanceInfo as setInstanceInfoInDatabase
-} from '../_database/meta'
+import { database } from '../_database/database'
 
 export function changeTheme (instanceName, newTheme) {
   let { instanceThemes } = store.get()
@@ -62,7 +56,7 @@ export async function logOutOfInstance (instanceName) {
   store.save()
   toast.say(`Logged out of ${instanceName}`)
   switchToTheme(instanceThemes[newInstance] || 'default')
-  await clearDatabaseForInstance(instanceName)
+  await database.clearDatabaseForInstance(instanceName)
   goto('/settings/instances')
 }
 
@@ -77,8 +71,8 @@ export async function updateVerifyCredentialsForInstance (instanceName) {
   let accessToken = loggedInInstances[instanceName].access_token
   await cacheFirstUpdateAfter(
     () => getVerifyCredentials(instanceName, accessToken),
-    () => getInstanceVerifyCredentialsFromDatabase(instanceName),
-    verifyCredentials => setInstanceVerifyCredentialsInDatabase(instanceName, verifyCredentials),
+    () => database.getInstanceVerifyCredentials(instanceName),
+    verifyCredentials => database.setInstanceVerifyCredentials(instanceName, verifyCredentials),
     verifyCredentials => setStoreVerifyCredentials(instanceName, verifyCredentials)
   )
 }
@@ -91,8 +85,8 @@ export async function updateVerifyCredentialsForCurrentInstance () {
 export async function updateInstanceInfo (instanceName) {
   await cacheFirstUpdateAfter(
     () => getInstanceInfo(instanceName),
-    () => getInstanceInfoFromDatabase(instanceName),
-    info => setInstanceInfoInDatabase(instanceName, info),
+    () => database.getInstanceInfo(instanceName),
+    info => database.setInstanceInfo(instanceName, info),
     info => {
       let { instanceInfos } = store.get()
       instanceInfos[instanceName] = info
diff --git a/routes/_actions/lists.js b/routes/_actions/lists.js
index df51073..753b630 100644
--- a/routes/_actions/lists.js
+++ b/routes/_actions/lists.js
@@ -1,18 +1,15 @@
 import { store } from '../_store/store'
 import { getLists } from '../_api/lists'
 import { cacheFirstUpdateAfter } from '../_utils/sync'
-import {
-  getLists as getListsFromDatabase,
-  setLists as setListsInDatabase
-} from '../_database/meta'
+import { database } from '../_database/database'
 
 export async function updateLists () {
   let { currentInstance, accessToken } = store.get()
 
   await cacheFirstUpdateAfter(
     () => getLists(currentInstance, accessToken),
-    () => getListsFromDatabase(currentInstance),
-    lists => setListsInDatabase(currentInstance, lists),
+    () => database.getLists(currentInstance),
+    lists => database.setLists(currentInstance, lists),
     lists => {
       let { instanceLists } = store.get()
       instanceLists[currentInstance] = lists
diff --git a/routes/_actions/muteConversation.js b/routes/_actions/muteConversation.js
index 1e5c1d4..c3ebc9e 100644
--- a/routes/_actions/muteConversation.js
+++ b/routes/_actions/muteConversation.js
@@ -1,7 +1,7 @@
 import { store } from '../_store/store'
 import { muteConversation, unmuteConversation } from '../_api/muteConversation'
 import { toast } from '../_utils/toast'
-import { setStatusMuted as setStatusMutedInDatabase } from '../_database/timelines/updateStatus'
+import { database } from '../_database/database'
 
 export async function setConversationMuted (statusId, mute, toastOnSuccess) {
   let { currentInstance, accessToken } = store.get()
@@ -11,7 +11,7 @@ export async function setConversationMuted (statusId, mute, toastOnSuccess) {
     } else {
       await unmuteConversation(currentInstance, accessToken, statusId)
     }
-    await setStatusMutedInDatabase(currentInstance, statusId, mute)
+    await database.setStatusMuted(currentInstance, statusId, mute)
     if (toastOnSuccess) {
       if (mute) {
         toast.say('Muted conversation')
diff --git a/routes/_actions/pin.js b/routes/_actions/pin.js
index b74a1e1..0d11a24 100644
--- a/routes/_actions/pin.js
+++ b/routes/_actions/pin.js
@@ -1,7 +1,7 @@
 import { store } from '../_store/store'
 import { toast } from '../_utils/toast'
 import { pinStatus, unpinStatus } from '../_api/pin'
-import { setStatusPinned as setStatusPinnedInDatabase } from '../_database/timelines/updateStatus'
+import { database } from '../_database/database'
 import { emit } from '../_utils/eventBus'
 
 export async function setStatusPinnedOrUnpinned (statusId, pinned, toastOnSuccess) {
@@ -20,7 +20,7 @@ export async function setStatusPinnedOrUnpinned (statusId, pinned, toastOnSucces
       }
     }
     store.setStatusPinned(currentInstance, statusId, pinned)
-    await setStatusPinnedInDatabase(currentInstance, statusId, pinned)
+    await database.setStatusPinned(currentInstance, statusId, pinned)
     emit('updatePinnedStatuses')
   } catch (e) {
     console.error(e)
diff --git a/routes/_actions/pinnedStatuses.js b/routes/_actions/pinnedStatuses.js
index 52d3704..bf35783 100644
--- a/routes/_actions/pinnedStatuses.js
+++ b/routes/_actions/pinnedStatuses.js
@@ -1,9 +1,6 @@
 import { store } from '../_store/store'
 import { cacheFirstUpdateAfter } from '../_utils/sync'
-import {
-  getPinnedStatuses as getPinnedStatusesFromDatabase,
-  insertPinnedStatuses as insertPinnedStatusesInDatabase
-} from '../_database/timelines/pinnedStatuses'
+import { database } from '../_database/database'
 import {
   getPinnedStatuses
 } from '../_api/pinnedStatuses'
@@ -13,8 +10,8 @@ export async function updatePinnedStatusesForAccount (accountId) {
 
   await cacheFirstUpdateAfter(
     () => getPinnedStatuses(currentInstance, accessToken, accountId),
-    () => getPinnedStatusesFromDatabase(currentInstance, accountId),
-    statuses => insertPinnedStatusesInDatabase(currentInstance, accountId, statuses),
+    () => database.getPinnedStatuses(currentInstance, accountId),
+    statuses => database.insertPinnedStatuses(currentInstance, accountId, statuses),
     statuses => {
       let { pinnedStatuses } = store.get()
       pinnedStatuses[currentInstance] = pinnedStatuses[currentInstance] || {}
diff --git a/routes/_actions/reblog.js b/routes/_actions/reblog.js
index b583ef8..f092dce 100644
--- a/routes/_actions/reblog.js
+++ b/routes/_actions/reblog.js
@@ -1,7 +1,7 @@
 import { store } from '../_store/store'
 import { toast } from '../_utils/toast'
 import { reblogStatus, unreblogStatus } from '../_api/reblog'
-import { setStatusReblogged as setStatusRebloggedInDatabase } from '../_database/timelines/updateStatus'
+import { database } from '../_database/database'
 
 export async function setReblogged (statusId, reblogged) {
   let online = store.get()
@@ -16,7 +16,7 @@ export async function setReblogged (statusId, reblogged) {
   store.setStatusReblogged(currentInstance, statusId, reblogged) // optimistic update
   try {
     await networkPromise
-    await setStatusRebloggedInDatabase(currentInstance, statusId, reblogged)
+    await database.setStatusReblogged(currentInstance, statusId, reblogged)
   } catch (e) {
     console.error(e)
     toast.say(`Failed to ${reblogged ? 'boost' : 'unboost'}. ` + (e.message || ''))
diff --git a/routes/_actions/statuses.js b/routes/_actions/statuses.js
index 3d0cdec..de07418 100644
--- a/routes/_actions/statuses.js
+++ b/routes/_actions/statuses.js
@@ -1,13 +1,7 @@
-import {
-  getNotificationIdsForStatuses as getNotificationIdsForStatusesFromDatabase,
-  getReblogsForStatus as getReblogsForStatusFromDatabase
-} from '../_database/timelines/lookup'
-import {
-  getStatus as getStatusFromDatabase
-} from '../_database/timelines/getStatusOrNotification'
+import { database } from '../_database/database'
 
 export async function getIdThatThisStatusReblogged (instanceName, statusId) {
-  let status = await getStatusFromDatabase(instanceName, statusId)
+  let status = await database.getStatus(instanceName, statusId)
   return status.reblog && status.reblog.id
 }
 
@@ -19,9 +13,9 @@ export async function getIdsThatTheseStatusesReblogged (instanceName, statusIds)
 }
 
 export async function getIdsThatRebloggedThisStatus (instanceName, statusId) {
-  return getReblogsForStatusFromDatabase(instanceName, statusId)
+  return database.getReblogsForStatus(instanceName, statusId)
 }
 
 export async function getNotificationIdsForStatuses (instanceName, statusIds) {
-  return getNotificationIdsForStatusesFromDatabase(instanceName, statusIds)
+  return database.getNotificationIdsForStatuses(instanceName, statusIds)
 }
diff --git a/routes/_actions/timeline.js b/routes/_actions/timeline.js
index f15d843..647acbc 100644
--- a/routes/_actions/timeline.js
+++ b/routes/_actions/timeline.js
@@ -5,19 +5,14 @@ import { mark, stop } from '../_utils/marks'
 import { concat, mergeArrays } from '../_utils/arrays'
 import { byItemIds } from '../_utils/sorting'
 import isEqual from 'lodash-es/isEqual'
-import {
-  insertTimelineItems as insertTimelineItemsInDatabase
-} from '../_database/timelines/insertion'
-import {
-  getTimeline as getTimelineFromDatabase
-} from '../_database/timelines/pagination'
+import { database } from '../_database/database'
 import { getStatus, getStatusContext } from '../_api/statuses'
 import { emit } from '../_utils/eventBus'
 
 const FETCH_LIMIT = 20
 
 async function storeFreshTimelineItemsInDatabase (instanceName, timelineName, items) {
-  await insertTimelineItemsInDatabase(instanceName, timelineName, items)
+  await database.insertTimelineItems(instanceName, timelineName, items)
   if (timelineName.startsWith('status/')) {
     // For status threads, we want to be sure to update the favorite/reblog counts even if
     // this is a stale "view" of the status. See 119-status-counts-update.js for
@@ -45,7 +40,7 @@ async function fetchTimelineItems (instanceName, accessToken, timelineName, last
   let items
   let stale = false
   if (!online) {
-    items = await getTimelineFromDatabase(instanceName, timelineName, lastTimelineItemId, FETCH_LIMIT)
+    items = await database.getTimeline(instanceName, timelineName, lastTimelineItemId, FETCH_LIMIT)
     stale = true
   } else {
     try {
@@ -54,7 +49,7 @@ async function fetchTimelineItems (instanceName, accessToken, timelineName, last
     } catch (e) {
       console.error(e)
       toast.say('Internet request failed. Showing offline content.')
-      items = await getTimelineFromDatabase(instanceName, timelineName, lastTimelineItemId, FETCH_LIMIT)
+      items = await database.getTimeline(instanceName, timelineName, lastTimelineItemId, FETCH_LIMIT)
       stale = true
     }
   }
diff --git a/routes/_components/timeline/Timeline.html b/routes/_components/timeline/Timeline.html
index 9db09bb..646a286 100644
--- a/routes/_components/timeline/Timeline.html
+++ b/routes/_components/timeline/Timeline.html
@@ -41,10 +41,7 @@
     importNotificationVirtualListItem
   } from '../../_utils/asyncModules'
   import { timelines } from '../../_static/timelines'
-  import {
-    getStatus as getStatusFromDatabase,
-    getNotification as getNotificationFromDatabase
-  } from '../../_database/timelines/getStatusOrNotification'
+  import { database } from '../../_database/database'
   import {
     fetchTimelineItemsOnScrollToBottom,
     setupTimeline,
@@ -101,9 +98,9 @@
           timelineValue
         }
         if (timelineType === 'notifications') {
-          res.notification = await getNotificationFromDatabase($currentInstance, itemId)
+          res.notification = await database.getNotification($currentInstance, itemId)
         } else {
-          res.status = await getStatusFromDatabase($currentInstance, itemId)
+          res.status = await database.getStatus($currentInstance, itemId)
         }
         return res
       },
diff --git a/routes/_database/accounts.js b/routes/_database/accounts.js
index 5f36e84..5d8e079 100644
--- a/routes/_database/accounts.js
+++ b/routes/_database/accounts.js
@@ -12,7 +12,8 @@ export async function setAccount (instanceName, account) {
   return setGenericEntityWithId(ACCOUNTS_STORE, accountsCache, instanceName, cloneForStorage(account))
 }
 
-export async function searchAccountsByUsername (instanceName, usernamePrefix, limit = 20) {
+export async function searchAccountsByUsername (instanceName, usernamePrefix, limit) {
+  limit = limit || 20
   const db = await getDatabase(instanceName)
   return dbPromise(db, ACCOUNTS_STORE, 'readonly', (accountsStore, callback) => {
     let keyRange = createAccountUsernamePrefixKeyRange(usernamePrefix.toLowerCase())
diff --git a/routes/_database/cache.js b/routes/_database/cache.js
index 2f3eed2..d6950db 100644
--- a/routes/_database/cache.js
+++ b/routes/_database/cache.js
@@ -22,7 +22,7 @@ export const notificationsCache = {
 }
 
 if (process.browser && process.env.NODE_ENV !== 'production') {
-  window.cacheStats = {
+  (typeof self !== 'undefined' ? self : window).cacheStats = {
     statuses: statusesCache,
     accounts: accountsCache,
     relationships: relationshipsCache,
diff --git a/routes/_database/cleanup.js b/routes/_database/cleanup.js
index 7d2124a..a93e3c8 100644
--- a/routes/_database/cleanup.js
+++ b/routes/_database/cleanup.js
@@ -1,5 +1,4 @@
 import { dbPromise, getDatabase } from './databaseLifecycle'
-import { scheduleIdleTask } from '../_utils/scheduleIdleTask'
 import {
   ACCOUNTS_STORE,
   NOTIFICATION_TIMELINES_STORE,
@@ -12,10 +11,10 @@ import {
   TIMESTAMP
 } from './constants'
 import debounce from 'lodash-es/debounce'
-import { store } from '../_store/store'
 import { mark, stop } from '../_utils/marks'
 import { deleteAll } from './utils'
 import { createPinnedStatusKeyRange, createThreadKeyRange } from './keys'
+import { getKnownInstances } from './knownInstances'
 
 const BATCH_SIZE = 20
 const TIME_AGO = 7 * 24 * 60 * 60 * 1000 // one week ago
@@ -135,15 +134,16 @@ async function cleanup (instanceName) {
 }
 
 function doCleanup (instanceName) {
-  scheduleIdleTask(() => cleanup(instanceName))
+  // run in setTimeout because we're in a worker and there's no requestIdleCallback
+  setTimeout(() => cleanup(instanceName))
 }
 
-function scheduledCleanup () {
+async function scheduledCleanup () {
   console.log('scheduledCleanup')
-  let { loggedInInstancesInOrder } = store.get()
-  for (let instance of loggedInInstancesInOrder) {
+  let knownInstances = await getKnownInstances()
+  for (let instance of knownInstances) {
     doCleanup(instance)
   }
 }
 
-export const scheduleCleanup = debounce(() => scheduleIdleTask(scheduledCleanup), DELAY)
+export const scheduleCleanup = debounce(scheduledCleanup, DELAY)
diff --git a/routes/_database/database.dev.js b/routes/_database/database.dev.js
new file mode 100644
index 0000000..0c88104
--- /dev/null
+++ b/routes/_database/database.dev.js
@@ -0,0 +1,3 @@
+// vanilla version
+import * as database from './databaseWorker'
+export { database }
diff --git a/routes/_database/database.js b/routes/_database/database.js
new file mode 100644
index 0000000..d07e1af
--- /dev/null
+++ b/routes/_database/database.js
@@ -0,0 +1,7 @@
+// workerize version
+let database
+if (process.browser) {
+  const worker = require('./databaseWorker')
+  database = worker()
+}
+export { database }
diff --git a/routes/_database/databaseLifecycle.js b/routes/_database/databaseLifecycle.js
index c1c46da..42c74da 100644
--- a/routes/_database/databaseLifecycle.js
+++ b/routes/_database/databaseLifecycle.js
@@ -13,6 +13,7 @@ import {
   STATUS_ID,
   USERNAME_LOWERCASE
 } from './constants'
+import { addKnownInstance, deleteKnownInstance } from './knownInstances'
 
 const openReqs = {}
 const databaseCache = {}
@@ -86,6 +87,8 @@ export function getDatabase (instanceName) {
       }
     }
     req.onsuccess = () => resolve(req.result)
+  }).then(res => {
+    return addKnownInstance(instanceName).then(() => res)
   })
   return databaseCache[instanceName]
 }
@@ -118,5 +121,5 @@ export function deleteDatabase (instanceName) {
     let req = indexedDB.deleteDatabase(instanceName)
     req.onsuccess = () => resolve()
     req.onerror = () => reject(req.error)
-  })
+  }).then(() => deleteKnownInstance(instanceName))
 }
diff --git a/routes/_database/databaseWorker.js b/routes/_database/databaseWorker.js
new file mode 100644
index 0000000..d652e16
--- /dev/null
+++ b/routes/_database/databaseWorker.js
@@ -0,0 +1,187 @@
+import {
+  getAccount as _getAccount,
+  searchAccountsByUsername as _searchAccountsByUsername,
+  setAccount as _setAccount
+} from './accounts'
+import {
+  clearDatabaseForInstance as _clearDatabaseForInstance
+} from './clear'
+import {
+  getNotificationIdsForStatuses as _getNotificationIdsForStatuses,
+  getReblogsForStatus as _getReblogsForStatus
+} from './timelines/lookup'
+import {
+  getPinnedStatuses as _getPinnedStatuses,
+  insertPinnedStatuses as _insertPinnedStatuses
+} from './timelines/pinnedStatuses'
+import {
+  getNotificationTimeline as _getNotificationTimeline,
+  getStatusThread as _getStatusThread,
+  getStatusTimeline as _getStatusTimeline,
+  getTimeline as _getTimeline
+} from './timelines/pagination'
+import {
+  getNotification as _getNotification,
+  getStatus as _getStatus
+} from './timelines/getStatusOrNotification'
+import {
+  setStatusFavorited as _setStatusFavorited,
+  setStatusMuted as _setStatusMuted,
+  setStatusPinned as _setStatusPinned,
+  setStatusReblogged as _setStatusReblogged
+} from './timelines/updateStatus'
+import {
+  deleteStatusesAndNotifications as _deleteStatusesAndNotifications
+} from './timelines/deletion'
+import {
+  insertStatusThread as _insertStatusThread,
+  insertTimelineItems as _insertTimelineItems,
+  insertTimelineNotifications as _insertTimelineNotifications,
+  insertTimelineStatuses as _insertTimelineStatuses
+} from './timelines/insertion'
+import {
+  getCustomEmoji as _getCustomEmoji,
+  getInstanceInfo as _getInstanceInfo,
+  getInstanceVerifyCredentials as _getInstanceVerifyCredentials,
+  getLists as _getLists,
+  setCustomEmoji as _setCustomEmoji,
+  setInstanceInfo as _setInstanceInfo,
+  setInstanceVerifyCredentials as _setInstanceVerifyCredentials,
+  setLists as _setLists
+} from './meta'
+import {
+  getRelationship as _getRelationship,
+  setRelationship as _setRelationship
+} from './relationships'
+
+export async function getAccount (instanceName, accountId) {
+  return _getAccount(instanceName, accountId)
+}
+
+export async function setAccount (instanceName, account) {
+  return _setAccount(instanceName, account)
+}
+
+export async function searchAccountsByUsername (instanceName, usernamePrefix, limit) {
+  return _searchAccountsByUsername(instanceName, usernamePrefix, limit)
+}
+
+export async function clearDatabaseForInstance (instanceName) {
+  return _clearDatabaseForInstance(instanceName)
+}
+
+export async function getReblogsForStatus (instanceName, id) {
+  return _getReblogsForStatus(instanceName, id)
+}
+
+export async function getNotificationIdsForStatuses (instanceName, statusIds) {
+  return _getNotificationIdsForStatuses(instanceName, statusIds)
+}
+
+export async function insertPinnedStatuses (instanceName, accountId, statuses) {
+  return _insertPinnedStatuses(instanceName, accountId, statuses)
+}
+
+export async function getPinnedStatuses (instanceName, accountId) {
+  return _getPinnedStatuses(instanceName, accountId)
+}
+
+export async function getNotificationTimeline (instanceName, timeline, maxId, limit) {
+  return _getNotificationTimeline(instanceName, timeline, maxId, limit)
+}
+
+export async function getStatusTimeline (instanceName, timeline, maxId, limit) {
+  return _getStatusTimeline(instanceName, timeline, maxId, limit)
+}
+
+export async function getStatusThread (instanceName, statusId) {
+  return _getStatusThread(instanceName, statusId)
+}
+
+export async function getTimeline (instanceName, timeline, maxId, limit) {
+  return _getTimeline(instanceName, timeline, maxId, limit)
+}
+
+export async function getStatus (instanceName, id) {
+  return _getStatus(instanceName, id)
+}
+
+export async function getNotification (instanceName, id) {
+  return _getNotification(instanceName, id)
+}
+
+export async function setStatusFavorited (instanceName, statusId, favorited) {
+  return _setStatusFavorited(instanceName, statusId, favorited)
+}
+
+export async function setStatusReblogged (instanceName, statusId, reblogged) {
+  return _setStatusReblogged(instanceName, statusId, reblogged)
+}
+
+export async function setStatusPinned (instanceName, statusId, pinned) {
+  return _setStatusPinned(instanceName, statusId, pinned)
+}
+
+export async function setStatusMuted (instanceName, statusId, muted) {
+  return _setStatusMuted(instanceName, statusId, muted)
+}
+
+export async function deleteStatusesAndNotifications (instanceName, statusIds, notificationIds) {
+  return _deleteStatusesAndNotifications(instanceName, statusIds, notificationIds)
+}
+
+export async function insertTimelineNotifications (instanceName, timeline, notifications) {
+  return _insertTimelineNotifications(instanceName, timeline, notifications)
+}
+
+export async function insertTimelineStatuses (instanceName, timeline, statuses) {
+  return _insertTimelineStatuses(instanceName, timeline, statuses)
+}
+
+export async function insertStatusThread (instanceName, statusId, statuses) {
+  return _insertStatusThread(instanceName, statusId, statuses)
+}
+
+export async function insertTimelineItems (instanceName, timeline, timelineItems) {
+  return _insertTimelineItems(instanceName, timeline, timelineItems)
+}
+
+export async function getInstanceVerifyCredentials (instanceName) {
+  return _getInstanceVerifyCredentials(instanceName)
+}
+
+export async function setInstanceVerifyCredentials (instanceName, value) {
+  return _setInstanceVerifyCredentials(instanceName, value)
+}
+
+export async function getInstanceInfo (instanceName) {
+  return _getInstanceInfo(instanceName)
+}
+
+export async function setInstanceInfo (instanceName, value) {
+  return _setInstanceInfo(instanceName, value)
+}
+
+export async function getLists (instanceName) {
+  return _getLists(instanceName)
+}
+
+export async function setLists (instanceName, value) {
+  return _setLists(instanceName, value)
+}
+
+export async function getCustomEmoji (instanceName) {
+  return _getCustomEmoji(instanceName)
+}
+
+export async function setCustomEmoji (instanceName, value) {
+  return _setCustomEmoji(instanceName, value)
+}
+
+export async function getRelationship (instanceName, accountId) {
+  return _getRelationship(instanceName, accountId)
+}
+
+export async function setRelationship (instanceName, relationship) {
+  return _setRelationship(instanceName, relationship)
+}
diff --git a/routes/_database/knownInstances.js b/routes/_database/knownInstances.js
new file mode 100644
index 0000000..8c5469b
--- /dev/null
+++ b/routes/_database/knownInstances.js
@@ -0,0 +1,17 @@
+import { set, keys, del } from 'idb-keyval'
+
+const PREFIX = 'known-instance-'
+
+export async function getKnownInstances () {
+  return (await keys())
+    .filter(_ => _.startsWith(PREFIX))
+    .map(_ => _.substring(PREFIX.length))
+}
+
+export async function addKnownInstance (instanceName) {
+  return set(PREFIX + instanceName, true)
+}
+
+export async function deleteKnownInstance (instanceName) {
+  return del(PREFIX + instanceName)
+}
diff --git a/routes/_database/timelines/pagination.js b/routes/_database/timelines/pagination.js
index ffa88c4..4036507 100644
--- a/routes/_database/timelines/pagination.js
+++ b/routes/_database/timelines/pagination.js
@@ -80,7 +80,9 @@ export async function getStatusThread (instanceName, statusId) {
   })
 }
 
-export async function getTimeline (instanceName, timeline, maxId = null, limit = 20) {
+export async function getTimeline (instanceName, timeline, maxId, limit) {
+  maxId = maxId || null
+  limit = limit || 20
   if (timeline === 'notifications') {
     return getNotificationTimeline(instanceName, timeline, maxId, limit)
   } else if (timeline.startsWith('status/')) {
diff --git a/routes/_store/observers/autosuggestObservers.js b/routes/_store/observers/autosuggestObservers.js
index a39aa0b..c213c21 100644
--- a/routes/_store/observers/autosuggestObservers.js
+++ b/routes/_store/observers/autosuggestObservers.js
@@ -1,6 +1,4 @@
-import {
-  searchAccountsByUsername as searchAccountsByUsernameInDatabase
-} from '../../_database/accounts'
+import { database } from '../../_database/database'
 
 const SEARCH_RESULTS_LIMIT = 4
 const DATABASE_SEARCH_RESULTS_LIMIT = 30
@@ -8,7 +6,7 @@ const DATABASE_SEARCH_RESULTS_LIMIT = 30
 async function searchAccounts (store, searchText) {
   searchText = searchText.substring(1)
   let { currentInstance } = store.get()
-  let results = await searchAccountsByUsernameInDatabase(
+  let results = await database.searchAccountsByUsername(
     currentInstance, searchText, DATABASE_SEARCH_RESULTS_LIMIT)
   return results.slice(0, SEARCH_RESULTS_LIMIT)
 }
diff --git a/routes/_utils/marks.js b/routes/_utils/marks.js
index fc17830..35d1dc5 100644
--- a/routes/_utils/marks.js
+++ b/routes/_utils/marks.js
@@ -1,6 +1,6 @@
 const enabled = process.browser && performance.mark && (
   process.env.NODE_ENV !== 'production' ||
-  location.search.includes('marks=true')
+  (typeof location !== 'undefined' && location.search.includes('marks=true'))
 )
 
 const perf = process.browser && performance
diff --git a/webpack.client.config.js b/webpack.client.config.js
index 74b04c1..1f81bce 100644
--- a/webpack.client.config.js
+++ b/webpack.client.config.js
@@ -10,6 +10,8 @@ const isDev = config.dev
 
 module.exports = {
   entry: config.client.entry(),
+  // uncomment to enable HMR within workers
+  // output: Object.assign(config.client.output(), { globalObject: 'this' }),
   output: config.client.output(),
   resolve: {
     extensions: ['.js', '.json', '.html']
@@ -45,6 +47,12 @@ module.exports = {
           MiniCssExtractPlugin.loader,
           'css-loader'
         ]
+      },
+      !isDev && { // workerize-loader makes dev mode hard (e.g. HMR)
+        test: /\/_database\/databaseWorker\.js$/,
+        use: [
+          'workerize-loader'
+        ]
       }
     ].filter(Boolean)
   },
@@ -80,6 +88,10 @@ module.exports = {
       paths: true
     })
   ].concat(isDev ? [
+    new webpack.NormalModuleReplacementPlugin(
+      /\/_database\/database\.js$/,
+      './database.dev.js'
+    ),
     new webpack.HotModuleReplacementPlugin({
       requestTimeout: 120000
     })