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Use the HTML 5 appcache to make the browser e-book viewer fully offline-able

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This commit is contained in:
Kovid Goyal 2017-04-06 19:55:51 +05:30
parent 00147c8e6c
commit 17a5977e4f
5 changed files with 63 additions and 14 deletions
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1
.gitignore vendored
View File

@ -22,6 +22,7 @@ resources/template-functions.json
resources/editor-functions.json
resources/user-manual-translation-stats.json
resources/content-server/index-generated.html
resources/content-server/calibre.appcache
resources/content-server/locales.zip
resources/content-server/mathjax.zip.xz
resources/content-server/mathjax.version

2
resources/content-server/index.html
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@ -1,5 +1,5 @@
<!DOCTYPE html>
<html>
<html manifest="calibre.appcache">
<head>
<title>calibre</title>
<meta charset="utf-8">

54
src/calibre/utils/rapydscript.py
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@ -1,23 +1,28 @@
#!/usr/bin/env python2
# vim:fileencoding=utf-8
from __future__ import (unicode_literals, division, absolute_import,
print_function)
# License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
from __future__ import absolute_import, division, print_function, unicode_literals
__license__ = 'GPL v3'
__copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
import os, sys, atexit, errno, subprocess, glob, shutil, json, re
from io import BytesIO
from threading import local
import atexit
import errno
import glob
import json
import os
import re
import shutil
import subprocess
import sys
from functools import partial
from threading import Thread
from Queue import Queue, Empty
from io import BytesIO
from Queue import Empty, Queue
from threading import Thread, local
from calibre import force_unicode
from calibre.constants import __appname__, __version__, cache_dir
from calibre.utils.terminal import ANSIStream
from duktape import Context, JSError, to_python
from lzma.xz import compress, decompress
from calibre import force_unicode
from calibre.constants import cache_dir, __appname__, __version__
from calibre.utils.terminal import ANSIStream
COMPILER_PATH = 'rapydscript/compiler.js.xz'
@ -47,6 +52,8 @@ def update_rapydscript():
# }}}
# Compiler {{{
tls = local()
@ -72,6 +79,7 @@ class CompileFailure(ValueError):
def default_lib_dir():
return P('rapydscript/lib', allow_user_override=False)
_cache_dir = None
@ -125,6 +133,7 @@ def compile_pyj(data, filename='<stdin>', beautify=True, private_scope=True, lib
raise CompileFailure(result.stack)
raise CompileFailure(repr(presult))
has_external_compiler = None
@ -170,6 +179,20 @@ def compile_fast(data, filename=None, beautify=True, private_scope=True, libdir=
return js.decode('utf-8')
def create_manifest(html):
import hashlib
from calibre.library.field_metadata import category_icon_map
h = hashlib.sha256(html)
for ci in category_icon_map.itervalues():
h.update(I(ci, data=True))
icons = {'icon/' + x for x in category_icon_map.itervalues()}
icons.add('favicon.png')
h.update(I('lt.png', data=True))
manifest = '\n'.join(sorted(icons))
return 'CACHE MANIFEST\n# {}\n{}\n\nNETWORK:\n*'.format(
h.hexdigest(), manifest).encode('utf-8')
def compile_srv():
d = os.path.dirname
base = d(d(d(d(os.path.abspath(__file__)))))
@ -195,8 +218,12 @@ def compile_srv():
js = compile_fast(f.read(), fname).replace('__RENDER_VERSION__', rv, 1).replace('__MATHJAX_VERSION__', mathjax_version, 1).encode('utf-8')
with lopen(os.path.join(base, 'index.html'), 'rb') as f:
html = f.read().replace(b'RESET_STYLES', reset, 1).replace(b'ICONS', icons, 1).replace(b'MAIN_JS', js, 1)
manifest = create_manifest(html)
with lopen(os.path.join(base, 'index-generated.html'), 'wb') as f:
f.write(html)
with lopen(os.path.join(base, 'calibre.appcache'), 'wb') as f:
f.write(manifest)
# }}}
@ -420,5 +447,6 @@ def main(args=sys.argv):
def entry():
main(sys.argv[1:])
if __name__ == '__main__':
main()

12
src/pyj/autoreload.pyj
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@ -46,6 +46,18 @@ class Watcher:
self.reload_app()
def reload_app(self):
appcache = window.top.applicationCache
for which in 'cached error noupdate obsolete updateready'.split(' '):
appcache.addEventListener(which, self.cache_update_done, False)
try:
appcache.update()
except: # In chrome with devtools open, appcache is sometimes disabled/fails
window.location.reload(True)
def cache_update_done(self):
appcache = window.top.applicationCache
if appcache.status is appcache.UPDATEREADY:
appcache.swapCache()
window.location.reload(True)

8
src/pyj/srv.pyj
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@ -2,6 +2,8 @@
# License: GPL v3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
from __python__ import hash_literals
from gettext import gettext as _
import initialize # noqa: unused-import
from ajax import ajax
from autoreload import create_auto_reload_watcher
@ -14,6 +16,12 @@ is_running_in_iframe = False # Changed before script is loaded in the iframe
if is_running_in_iframe:
init()
else:
window.applicationCache.addEventListener('updateready', def():
if window.applicationCache.status is window.applicationCache.UPDATEREADY:
window.applicationCache.swapCache()
if window.confirm(_('The calibre web application has been updated. Do you want reload the site?')):
window.location.reload()
, False)
script = document.currentScript or document.scripts[0]
main_js(script.textContent)
script.parentNode.removeChild(script) # save some memory