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More useful error message when IndexDB flakes out in Chrome

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Kovid Goyal 2017-06-27 00:22:37 +05:30
parent dcf95a3418
commit 97cd9fd361
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1 changed files with 13 additions and 4 deletions
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17
src/pyj/read_book/db.pyj
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@ -152,7 +152,8 @@ class DB:
' browser such as Google Chrome or Mozilla Firefox')) ' browser such as Google Chrome or Mozilla Firefox'))
return return
raise raise
req.onsuccess = def(event): proceed(req.result) req.onsuccess = def(event):
proceed(req.result)
elif op is 'put': elif op is 'put':
transaction = self.idb.transaction(stores, 'readwrite') transaction = self.idb.transaction(stores, 'readwrite')
req = transaction.objectStore(store).put(data) req = transaction.objectStore(store).put(data)
@ -250,7 +251,8 @@ class DB:
if needs_encoding: if needs_encoding:
data = base64encode(Uint8Array(data)) data = base64encode(Uint8Array(data))
req = self.idb.transaction(['files'], 'readwrite').objectStore('files').put(data, fname) req = self.idb.transaction(['files'], 'readwrite').objectStore('files').put(data, fname)
req.onsuccess = def(event): proceed() req.onsuccess = def(event):
proceed()
req.onerror = def(event): req.onerror = def(event):
proceed(_('Failed to store book data ({0}) with error: {1}').format(name, get_error_details(event))) proceed(_('Failed to store book data ({0}) with error: {1}').format(name, get_error_details(event)))
@ -291,9 +293,14 @@ class DB:
def get_file(self, book, name, proceed): def get_file(self, book, name, proceed):
key = file_store_name(book, name) key = file_store_name(book, name)
err = _( err = _(
'Failed to read the file {0} for the book {1} from the database').format(name, book.metadata.title) 'Failed to read the file {0} for the book {1} from the browser offline cache.'
' This usually means the cache is close to full. Clear the browser'
' cache from the browser settings.').format(name, book.metadata.title)
self.do_op(['files'], key, err, def (result): self.do_op(['files'], key, err, def (result):
if not result: if not result:
# File was not found in the cache, this happens in Chrome if
# the Application Cache is full. IndexedDB put succeeds,
# but get fails. Browsers are a horrible travesty.
self.show_error(_('Cannot read file from book'), err) self.show_error(_('Cannot read file from book'), err)
return return
fdata = book.stored_files[key] fdata = book.stored_files[key]
@ -306,7 +313,9 @@ class DB:
def get_mathjax_files(self, proceed): def get_mathjax_files(self, proceed):
c = self.idb.transaction('mathjax').objectStore('mathjax').openCursor() c = self.idb.transaction('mathjax').objectStore('mathjax').openCursor()
c.onerror = def(event): c.onerror = def(event):
err = _('Failed to read the MathJax files from local storage') err = _('Failed to read the MathJax files from local storage.'
' This usually means the cache is close to full. Clear the browser'
' cache from the browser settings.')
self.display_error(err, event) self.display_error(err, event)
data = {} data = {}
c.onsuccess = def(event): c.onsuccess = def(event):