Why does Calibre need to go to the web to convert a zipped HTML file?

FizzyWater · 06-28-2008, 10:08 PM

I was creating LRF files from a number of zipped up HTML files I have...but Calibre hung unless I let it connect to the web.

What the heck does it need to go out to the internet for? My files are self-contained.

kovidgoyal · 06-28-2008, 10:48 PM

It doesn't

FizzyWater · 06-29-2008, 12:42 AM

When I click the button to convert the book, my firewall (ZoneAlarm) tells me Calibre (or, more specifically calibre-parallel.exe) wants to access the internet. If I say "no", Calibre hangs and will not create the book.

If I turn on ZoneAlarm's Internet Lock before clicking on the convert book button, Calibre hangs and will not create the book.

If I disconnect my computer from the internet, and when the firewall asks if Calibre can connect to the internet, I tell it yes, it will try to connect a few times, then convert the book.

It wants to go the web for something. ZoneAlarm says it's trying to go to 127.0.0.1:Port 10013.

[a little later]

Okay, with a little digging, I see that 127.0.0.1 is a "loopback" test back to my own computer. But why does Calibre do that? Is it trying to see if my Sony Reader is attached to the computer?

kovidgoyal · 06-29-2008, 02:29 AM

calibre has a parallel processing architecture. Every conversion job is handed off to an independent process. These processes are controlled using TCP/IP networking. i.e. the GUI starts a server that controls these worker processes. The server runs on your computer as do the worker processes, and they talk to each other, but only on your computer.

FizzyWater · 06-30-2008, 12:51 AM

Thanks for the explanation.

06-28-2008, 10:08 PM	#1
FizzyWater You kids get off my lawn! Posts: 4,220 Karma: 73492664 Join Date: Aug 2007 Location: Columbus, Ohio Device: Oasis 2 and Libra H2O and half a dozen older models I can't let go of	Why does Calibre need to go to the web to convert a zipped HTML file? I was creating LRF files from a number of zipped up HTML files I have...but Calibre hung unless I let it connect to the web. What the heck does it need to go out to the internet for? My files are self-contained.

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06-28-2008, 10:48 PM	#2
kovidgoyal creator of calibre Posts: 45,146 Karma: 27110894 Join Date: Oct 2006 Location: Mumbai, India Device: Various	It doesn't

06-29-2008, 12:42 AM	#3
FizzyWater You kids get off my lawn! Posts: 4,220 Karma: 73492664 Join Date: Aug 2007 Location: Columbus, Ohio Device: Oasis 2 and Libra H2O and half a dozen older models I can't let go of	When I click the button to convert the book, my firewall (ZoneAlarm) tells me Calibre (or, more specifically calibre-parallel.exe) wants to access the internet. If I say "no", Calibre hangs and will not create the book. If I turn on ZoneAlarm's Internet Lock before clicking on the convert book button, Calibre hangs and will not create the book. If I disconnect my computer from the internet, and when the firewall asks if Calibre can connect to the internet, I tell it yes, it will try to connect a few times, then convert the book. It wants to go the web for something. ZoneAlarm says it's trying to go to 127.0.0.1:Port 10013. [a little later] Okay, with a little digging, I see that 127.0.0.1 is a "loopback" test back to my own computer. But why does Calibre do that? Is it trying to see if my Sony Reader is attached to the computer?

06-29-2008, 02:29 AM	#4
kovidgoyal creator of calibre Posts: 45,146 Karma: 27110894 Join Date: Oct 2006 Location: Mumbai, India Device: Various	calibre has a parallel processing architecture. Every conversion job is handed off to an independent process. These processes are controlled using TCP/IP networking. i.e. the GUI starts a server that controls these worker processes. The server runs on your computer as do the worker processes, and they talk to each other, but only on your computer.

06-30-2008, 12:51 AM	#5
FizzyWater You kids get off my lawn! Posts: 4,220 Karma: 73492664 Join Date: Aug 2007 Location: Columbus, Ohio Device: Oasis 2 and Libra H2O and half a dozen older models I can't let go of	Thanks for the explanation.

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