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restore.py

#!/usr/bin/env python
# vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai

__license__   = 'GPL v3'
__copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
__docformat__ = 'restructuredtext en'

import re, os, traceback, shutil
from threading import Thread
from operator import itemgetter

from calibre.ptempfile import TemporaryDirectory
from calibre.ebooks.metadata.opf2 import OPF
from calibre.library.database2 import LibraryDatabase2
from calibre.constants import filesystem_encoding
from calibre import isbytestring

NON_EBOOK_EXTENSIONS = frozenset([
        'jpg', 'jpeg', 'gif', 'png', 'bmp',
        'opf', 'swp', 'swo'
        ])

class RestoreDatabase(LibraryDatabase2):

    PATH_LIMIT = 10

    def set_path(self, *args, **kwargs):
        pass

    def dirtied(self, *args, **kwargs):
        pass

class Restore(Thread):

    def __init__(self, library_path, progress_callback=None):
        super(Restore, self).__init__()
        if isbytestring(library_path):
            library_path = library_path.decode(filesystem_encoding)
        self.src_library_path = os.path.abspath(library_path)
        self.progress_callback = progress_callback
        self.db_id_regexp = re.compile(r'^.* \((\d+)\)$')
        self.bad_ext_pat = re.compile(r'[^a-z0-9]+')
        if not callable(self.progress_callback):
            self.progress_callback = lambda x, y: x
        self.dirs = []
        self.ignored_dirs = []
        self.failed_dirs = []
        self.books = []
        self.conflicting_custom_cols = {}
        self.failed_restores = []
        self.mismatched_dirs = []
        self.successes = 0
        self.tb = None

    @property
    def errors_occurred(self):
        return self.failed_dirs or self.mismatched_dirs or \
                self.conflicting_custom_cols or self.failed_restores

    @property
    def report(self):
        ans = ''
        failures = list(self.failed_dirs) + [(x['dirpath'], tb) for x, tb in
                self.failed_restores]
        if failures:
            ans += 'Failed to restore the books in the following folders:\n'
            for dirpath, tb in failures:
                ans += '\t' + dirpath + ' with error:\n'
                ans += '\n'.join('\t\t'+x for x in tb.splitlines())
                ans += '\n\n'

        if self.conflicting_custom_cols:
            ans += '\n\n'
            ans += 'The following custom columns have conflicting definitions ' \
                    'and were not fully restored:\n'
            for x in self.conflicting_custom_cols:
                ans += '\t#'+x+'\n'
                ans += '\tused:\t%s, %s, %s, %s\n'%(self.custom_columns[x][1],
                                                    self.custom_columns[x][2],
                                                    self.custom_columns[x][3],
                                                    self.custom_columns[x][5])
                for coldef in self.conflicting_custom_cols[x]:
                    ans += '\tother:\t%s, %s, %s, %s\n'%(coldef[1], coldef[2],
                                                         coldef[3], coldef[5])

        if self.mismatched_dirs:
            ans += '\n\n'
            ans += 'The following folders were ignored:\n'
            for x in self.mismatched_dirs:
                ans += '\t'+x+'\n'


        return ans


    def run(self):
        try:
            with TemporaryDirectory('_library_restore') as tdir:
                self.library_path = tdir
                self.scan_library()
                self.create_cc_metadata()
                self.restore_books()
                if self.successes == 0 and len(self.dirs) > 0:
                    raise Exception(('Something bad happened'))
                self.replace_db()
        except:
            self.tb = traceback.format_exc()

    def scan_library(self):
        for dirpath, dirnames, filenames in os.walk(self.src_library_path):
            leaf = os.path.basename(dirpath)
            m = self.db_id_regexp.search(leaf)
            if m is None or 'metadata.opf' not in filenames:
                self.ignored_dirs.append(dirpath)
                continue
            self.dirs.append((dirpath, filenames, m.group(1)))

        self.progress_callback(None, len(self.dirs))
        for i, x in enumerate(self.dirs):
            dirpath, filenames, book_id = x
            try:
                self.process_dir(dirpath, filenames, book_id)
            except:
                self.failed_dirs.append((dirpath, traceback.format_exc()))
            self.progress_callback(_('Processed') + ' ' + dirpath, i+1)

    def is_ebook_file(self, filename):
        ext = os.path.splitext(filename)[1]
        if not ext:
            return False
        ext = ext[1:].lower()
        if ext in NON_EBOOK_EXTENSIONS or \
                self.bad_ext_pat.search(ext) is not None:
            return False
        return True

    def process_dir(self, dirpath, filenames, book_id):
        book_id = int(book_id)
        formats = filter(self.is_ebook_file, filenames)
        fmts    = [os.path.splitext(x)[1][1:].upper() for x in formats]
        sizes   = [os.path.getsize(os.path.join(dirpath, x)) for x in formats]
        names   = [os.path.splitext(x)[0] for x in formats]
        opf = os.path.join(dirpath, 'metadata.opf')
        mi = OPF(opf).to_book_metadata()
        timestamp = os.path.getmtime(opf)
        path = os.path.relpath(dirpath, self.src_library_path).replace(os.sep,
                '/')

        if int(mi.application_id) == book_id:
            self.books.append({
                'mi': mi,
                'timestamp': timestamp,
                'formats': list(zip(fmts, sizes, names)),
                'id': book_id,
                'dirpath': dirpath,
                'path': path,
            })
        else:
            self.mismatched_dirs.append(dirpath)

    def create_cc_metadata(self):
        self.books.sort(key=itemgetter('timestamp'))
        self.custom_columns = {}
        fields = ('label', 'name', 'datatype', 'is_multiple', 'is_editable',
                    'display')
        for b in self.books:
            for key in b['mi'].custom_field_keys():
                cfm = b['mi'].metadata_for_field(key)
                args = []
                for x in fields:
                    if x in cfm:
                        if x == 'is_multiple':
                            args.append(cfm[x] is not None)
                        else:
                            args.append(cfm[x])
                if len(args) == len(fields):
                    # TODO: Do series type columns need special handling?
                    label = cfm['label']
                    if label in self.custom_columns and args != self.custom_columns[label]:
                        if label not in self.conflicting_custom_cols:
                            self.conflicting_custom_cols[label] = []
                        if self.custom_columns[label] not in self.conflicting_custom_cols[label]:
                            self.conflicting_custom_cols[label].append(self.custom_columns[label])
                    self.custom_columns[label] = args

        db = RestoreDatabase(self.library_path)
        self.progress_callback(None, len(self.custom_columns))
        if len(self.custom_columns):
            for i,args in enumerate(self.custom_columns.values()):
                db.create_custom_column(*args)
                self.progress_callback(_('creating custom column ')+args[0], i+1)
        db.conn.close()

    def restore_books(self):
        self.progress_callback(None, len(self.books))
        self.books.sort(key=itemgetter('id'))

        db = RestoreDatabase(self.library_path)

        for i, book in enumerate(self.books):
            try:
                self.restore_book(book, db)
            except:
                self.failed_restores.append((book, traceback.format_exc()))
            self.progress_callback(book['mi'].title, i+1)

        db.conn.close()

    def restore_book(self, book, db):
        db.create_book_entry(book['mi'], add_duplicates=True,
                force_id=book['id'])
        if book['mi'].uuid:
            db.set_uuid(book['id'], book['mi'].uuid, commit=False, notify=False)
        db.conn.execute('UPDATE books SET path=? WHERE id=?', (book['path'],
            book['id']))

        for fmt, size, name in book['formats']:
            db.conn.execute('''
                INSERT INTO data (book,format,uncompressed_size,name)
                VALUES (?,?,?,?)''', (book['id'], fmt, size, name))
        db.conn.commit()
        self.successes += 1

    def replace_db(self):
        dbpath = os.path.join(self.src_library_path, 'metadata.db')
        ndbpath = os.path.join(self.library_path, 'metadata.db')

        save_path = self.olddb = os.path.splitext(dbpath)[0]+'_pre_restore.db'
        if os.path.exists(save_path):
            os.remove(save_path)
        os.rename(dbpath, save_path)
        shutil.copyfile(ndbpath, dbpath)


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