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db.coffee
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db.coffee
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class app.DB
NAME = 'docs'
VERSION = 15
constructor: ->
@versionMultipler = if $.isIE() then 1e5 else 1e9
@useIndexedDB = @useIndexedDB()
@callbacks = []
db: (fn) ->
return fn() unless @useIndexedDB
@callbacks.push(fn) if fn
return if @open
try
@open = true
req = indexedDB.open(NAME, VERSION * @versionMultipler + @userVersion())
req.onsuccess = @onOpenSuccess
req.onerror = @onOpenError
req.onupgradeneeded = @onUpgradeNeeded
catch error
@fail 'exception', error
return
onOpenSuccess: (event) =>
db = event.target.result
if db.objectStoreNames.length is 0
try db.close()
@open = false
@fail 'empty'
else if error = @buggyIDB(db)
try db.close()
@open = false
@fail 'buggy', error
else
@runCallbacks(db)
@open = false
db.close()
return
onOpenError: (event) =>
event.preventDefault()
@open = false
error = event.target.error
switch error.name
when 'QuotaExceededError'
@onQuotaExceededError()
when 'VersionError'
@onVersionError()
when 'InvalidStateError'
@fail 'private_mode'
else
@fail 'cant_open', error
return
fail: (reason, error) ->
@cachedDocs = null
@useIndexedDB = false
@reason or= reason
@error or= error
console.error? 'IDB error', error if error
@runCallbacks()
if error and reason is 'cant_open'
Raven.captureMessage "#{error.name}: #{error.message}", level: 'warning', fingerprint: [error.name]
return
onQuotaExceededError: ->
@reset()
@db()
app.onQuotaExceeded()
Raven.captureMessage 'QuotaExceededError', level: 'warning'
return
onVersionError: ->
req = indexedDB.open(NAME)
req.onsuccess = (event) =>
@handleVersionMismatch event.target.result.version
req.onerror = (event) ->
event.preventDefault()
@fail 'cant_open', error
return
handleVersionMismatch: (actualVersion) ->
if Math.floor(actualVersion / @versionMultipler) isnt VERSION
@fail 'version'
else
@setUserVersion actualVersion - VERSION * @versionMultipler
@db()
return
buggyIDB: (db) ->
return if @checkedBuggyIDB
@checkedBuggyIDB = true
try
@idbTransaction(db, stores: $.makeArray(db.objectStoreNames)[0..1], mode: 'readwrite').abort() # https://bugs.webkit.org/show_bug.cgi?id=136937
return
catch error
return error
runCallbacks: (db) ->
fn(db) while fn = @callbacks.shift()
return
onUpgradeNeeded: (event) ->
return unless db = event.target.result
objectStoreNames = $.makeArray(db.objectStoreNames)
unless $.arrayDelete(objectStoreNames, 'docs')
try db.createObjectStore('docs')
for doc in app.docs.all() when not $.arrayDelete(objectStoreNames, doc.slug)
try db.createObjectStore(doc.slug)
for name in objectStoreNames
try db.deleteObjectStore(name)
return
store: (doc, data, onSuccess, onError, _retry = true) ->
@db (db) =>
unless db
onError()
return
txn = @idbTransaction db, stores: ['docs', doc.slug], mode: 'readwrite', ignoreError: false
txn.oncomplete = =>
@cachedDocs?[doc.slug] = doc.mtime
onSuccess()
return
txn.onerror = (event) =>
event.preventDefault()
if txn.error?.name is 'NotFoundError' and _retry
@migrate()
setTimeout =>
@store(doc, data, onSuccess, onError, false)
, 0
else
onError(event)
return
store = txn.objectStore(doc.slug)
store.clear()
store.add(content, path) for path, content of data
store = txn.objectStore('docs')
store.put(doc.mtime, doc.slug)
return
return
unstore: (doc, onSuccess, onError, _retry = true) ->
@db (db) =>
unless db
onError()
return
txn = @idbTransaction db, stores: ['docs', doc.slug], mode: 'readwrite', ignoreError: false
txn.oncomplete = =>
delete @cachedDocs?[doc.slug]
onSuccess()
return
txn.onerror = (event) ->
event.preventDefault()
if txn.error?.name is 'NotFoundError' and _retry
@migrate()
setTimeout =>
@unstore(doc, onSuccess, onError, false)
, 0
else
onError(event)
return
store = txn.objectStore('docs')
store.delete(doc.slug)
store = txn.objectStore(doc.slug)
store.clear()
return
return
version: (doc, fn) ->
if (version = @cachedVersion(doc))?
fn(version)
return
@db (db) =>
unless db
fn(false)
return
txn = @idbTransaction db, stores: ['docs'], mode: 'readonly'
store = txn.objectStore('docs')
req = store.get(doc.slug)
req.onsuccess = ->
fn(req.result)
return
req.onerror = (event) ->
event.preventDefault()
fn(false)
return
return
return
cachedVersion: (doc) ->
return unless @cachedDocs
@cachedDocs[doc.slug] or false
versions: (docs, fn) ->
if versions = @cachedVersions(docs)
fn(versions)
return
@db (db) =>
unless db
fn(false)
return
txn = @idbTransaction db, stores: ['docs'], mode: 'readonly'
txn.oncomplete = ->
fn(result)
return
store = txn.objectStore('docs')
result = {}
docs.forEach (doc) ->
req = store.get(doc.slug)
req.onsuccess = ->
result[doc.slug] = req.result
return
req.onerror = (event) ->
event.preventDefault()
result[doc.slug] = false
return
return
return
cachedVersions: (docs) ->
return unless @cachedDocs
result = {}
result[doc.slug] = @cachedVersion(doc) for doc in docs
result
load: (entry, onSuccess, onError) ->
if @shouldLoadWithIDB(entry)
onError = @loadWithXHR.bind(@, entry, onSuccess, onError)
@loadWithIDB entry, onSuccess, onError
else
@loadWithXHR entry, onSuccess, onError
loadWithXHR: (entry, onSuccess, onError) ->
ajax
url: entry.fileUrl()
dataType: 'html'
success: onSuccess
error: onError
loadWithIDB: (entry, onSuccess, onError) ->
@db (db) =>
unless db
onError()
return
unless db.objectStoreNames.contains(entry.doc.slug)
onError()
@loadDocsCache(db)
return
txn = @idbTransaction db, stores: [entry.doc.slug], mode: 'readonly'
store = txn.objectStore(entry.doc.slug)
req = store.get(entry.dbPath())
req.onsuccess = ->
if req.result then onSuccess(req.result) else onError()
return
req.onerror = (event) ->
event.preventDefault()
onError()
return
@loadDocsCache(db)
return
loadDocsCache: (db) ->
return if @cachedDocs
@cachedDocs = {}
txn = @idbTransaction db, stores: ['docs'], mode: 'readonly'
txn.oncomplete = =>
setTimeout(@checkForCorruptedDocs, 50)
return
req = txn.objectStore('docs').openCursor()
req.onsuccess = (event) =>
return unless cursor = event.target.result
@cachedDocs[cursor.key] = cursor.value
cursor.continue()
return
req.onerror = (event) ->
event.preventDefault()
return
return
checkForCorruptedDocs: =>
@db (db) =>
@corruptedDocs = []
docs = (key for key, value of @cachedDocs when value)
return if docs.length is 0
for slug in docs when not app.docs.findBy('slug', slug)
@corruptedDocs.push(slug)
for slug in @corruptedDocs
$.arrayDelete(docs, slug)
if docs.length is 0
setTimeout(@deleteCorruptedDocs, 0)
return
txn = @idbTransaction(db, stores: docs, mode: 'readonly', ignoreError: false)
txn.oncomplete = =>
setTimeout(@deleteCorruptedDocs, 0) if @corruptedDocs.length > 0
return
for doc in docs
txn.objectStore(doc).get('index').onsuccess = (event) =>
@corruptedDocs.push(event.target.source.name) unless event.target.result
return
return
return
deleteCorruptedDocs: =>
@db (db) =>
txn = @idbTransaction(db, stores: ['docs'], mode: 'readwrite', ignoreError: false)
store = txn.objectStore('docs')
while doc = @corruptedDocs.pop()
@cachedDocs[doc] = false
store.delete(doc)
return
Raven.captureMessage 'corruptedDocs', level: 'info', extra: { docs: @corruptedDocs.join(',') }
return
shouldLoadWithIDB: (entry) ->
@useIndexedDB and (not @cachedDocs or @cachedDocs[entry.doc.slug])
idbTransaction: (db, options) ->
app.lastIDBTransaction = [options.stores, options.mode]
txn = db.transaction(options.stores, options.mode)
unless options.ignoreError is false
txn.onerror = (event) ->
event.preventDefault()
return
unless options.ignoreAbort is false
txn.onabort = (event) ->
event.preventDefault()
return
txn
reset: ->
try indexedDB?.deleteDatabase(NAME) catch
return
useIndexedDB: ->
try
if !app.isSingleDoc() and window.indexedDB
true
else
@reason = 'not_supported'
false
catch
false
migrate: ->
app.settings.set('schema', @userVersion() + 1)
return
setUserVersion: (version) ->
app.settings.set('schema', version)
return
userVersion: ->
app.settings.get('schema')