Calibre Web Viewer and Cache for Offline Reading

[Nguyen Quoc Khanh]

Firstly, I understand that by default Calibre Web Viewer is not supporting cache for http connection. As a work-around, I use Fully Kiosk Browser (on Android) and its cache mode to read and it is mostly fine, better than using Chrome (or other browser).

However, recently (I don't remember from which version, 6.xx maybe) even in the cache mode, if Calibre Content Server is offline for a reason or if the connection is lost (travelling in an airplane), the following message pops up regularly (I think when ever I tap to turn pages or make highlights...)

Uncaught TypeError: undefined is not iterable (cannot read property Symbol(Symbol.iterator))
Error at http://xyz/:3082:24
Traceback (most recent call last):
    at IframeWrapper.handle_message (http://xyz/:18891:17)
    at View.on_update_cfi (http://xyz5/:50823:17)
    at update_book_in_recently_read_by_user_on_home_page (http://xyz/:12407:28)
    at ρσ_Iterable (http://xyz/:3082:24)
TypeError: undefined is not iterable (cannot read property Symbol(Symbol.iterator))

I'm just guessing that Calibre Web Viewer is calling home regularly to sync (and else), which is acceptable for me because the server is on most of the time, but if there is an option to pause it during irregular moments, it would be great.

Thank you.

PS: at this moment, my Poke 3 can't get to wifi so it can't connect to the server because of local power cut....

[Kovid Goyal (kovid)]

Fixed in branch master. The fix will be in the next release. calibre is usually released every alternate Friday.

[Nguyen Quoc Khanh (quockhanh77)]

Thank you for the fix in Calibre 7.5.1.

It works well in offline mode. Yeah.

But when I reconnect to the server after the app (fully kiosk browser, chrome) is swiped off, the following error appears, even when the server is online

Uncaught TypeError: Cannot read properties of undefined (reading 'is_local')
Error at http://yyz.xmm/:10879:141
Traceback (most recent call last):
    at XMLHttpRequest.ρσ_anonfunc (http://yyz.xmm/:5952:21)
    at complete_callback (http://yyz.xmm/:5920:17)
    at on_data_loaded (http://yyz.xmm/:11516:24)
    at UserSessionData.set_library_option (http://yyz.xmm/:10898:25)
    at UserSessionData.set (http://yyz.xmm/:10879:141)
TypeError: Cannot read properties of undefined (reading 'is_local')

It can be closed and the reading is normal, until the next clean connection

[Kovid Goyal (kovid)]

fixed by: https://github.com/kovidgoyal/calibre/commit/14caed3a6f0f57e172d1eb407703f0e4cc179e11

[Nguyen Quoc Khanh (quockhanh77)]

May I ask is it implemented in the exe (7.5.1 now) yet?

[Kovid Goyal (kovid)]

No, it isnt.