Simpler deployment.
[redakcja.git] / lib / vstorage.py
index b23234a..82151da 100644 (file)
@@ -1,9 +1,17 @@
 # -*- coding: utf-8 -*-
+#
+# This file is part of FNP-Redakcja, licensed under GNU Affero GPLv3 or later.
+# Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
+#
 import os
 import tempfile
 import datetime
 import mimetypes
 import urllib
+import functools
+
+import logging
+logger = logging.getLogger('fnp.hazlenut.vstorage')
 
 # Note: we have to set these before importing Mercurial
 os.environ['HGENCODING'] = 'utf-8'
@@ -15,9 +23,9 @@ import mercurial.revlog
 import mercurial.util
 
 
-def urlquote(url, safe = '/'):
-    """Quotes URL 
-    
+def urlquote(url, safe='/'):
+    """Quotes URL
+
     >>> urlquote(u'Za\u017c\xf3\u0142\u0107 g\u0119\u015bl\u0105 ja\u017a\u0144')
     'Za%C5%BC%C3%B3%C5%82%C4%87_g%C4%99%C5%9Bl%C4%85_ja%C5%BA%C5%84'
     """
@@ -25,8 +33,8 @@ def urlquote(url, safe = '/'):
 
 
 def urlunquote(url):
-    """Unqotes URL 
-    
+    """Unqotes URL
+
     # >>> urlunquote('Za%C5%BC%C3%B3%C5%82%C4%87_g%C4%99%C5%9Bl%C4%85_ja%C5%BA%C5%84')
     # u'Za\u017c\xf3\u0142\u0107 g\u0119\u015bl\u0105 ja\u017a\u0144'
     """
@@ -42,27 +50,38 @@ def find_repo_path(path):
     return path
 
 
-def locked_repo(func):
+def with_working_copy_locked(func):
     """A decorator for locking the repository when calling a method."""
 
-    def new_func(self, *args, **kwargs):
+    @functools.wraps(func)
+    def wrapped(self, *args, **kwargs):
         """Wrap the original function in locks."""
-
         wlock = self.repo.wlock()
-        lock = self.repo.lock()
         try:
-            func(self, *args, **kwargs)
+            return func(self, *args, **kwargs)
         finally:
-            lock.release()
             wlock.release()
+    return wrapped
 
-    return new_func
+
+def with_storage_locked(func):
+    """A decorator for locking the repository when calling a method."""
+
+    @functools.wraps(func)
+    def wrapped(self, *args, **kwargs):
+        """Wrap the original function in locks."""
+        lock = self.repo.lock()
+        try:
+            return func(self, *args, **kwargs)
+        finally:
+            lock.release()
+    return wrapped
 
 
 def guess_mime(file_name):
     """
     Guess file's mime type based on extension.
-    Default ot text/x-wiki for files without an extension.
+    Default of text/x-wiki for files without an extension.
 
     >>> guess_mime('something.txt')
     'text/plain'
@@ -78,7 +97,7 @@ def guess_mime(file_name):
     'archive/gzip'
     """
 
-    mime, encoding = mimetypes.guess_type(file_name, strict = False)
+    mime, encoding = mimetypes.guess_type(file_name, strict=False)
     if encoding:
         mime = 'archive/%s' % encoding
     if mime is None:
@@ -96,7 +115,7 @@ class VersionedStorage(object):
     change history, using Mercurial repository as the storage method.
     """
 
-    def __init__(self, path, charset = None):
+    def __init__(self, path, charset=None):
         """
         Takes the path to the directory where the pages are to be kept.
         If the directory doen't exist, it will be created. If it's inside
@@ -109,34 +128,31 @@ class VersionedStorage(object):
         if not os.path.exists(self.path):
             os.makedirs(self.path)
         self.repo_path = find_repo_path(self.path)
-        try:
-            self.ui = mercurial.ui.ui(report_untrusted = False,
-                                      interactive = False, quiet = True)
-        except TypeError:
-            # Mercurial 1.3 changed the way we setup the ui object.
-            self.ui = mercurial.ui.ui()
-            self.ui.quiet = True
-            self.ui._report_untrusted = False
-            self.ui.setconfig('ui', 'interactive', False)
+
+        self.ui = mercurial.ui.ui()
+        self.ui.quiet = True
+        self.ui._report_untrusted = False
+        self.ui.setconfig('ui', 'interactive', False)
+
         if self.repo_path is None:
             self.repo_path = self.path
             create = True
         else:
             create = False
+
         self.repo_prefix = self.path[len(self.repo_path):].strip('/')
         self.repo = mercurial.hg.repository(self.ui, self.repo_path,
-                                            create = create)
+                                            create=create)
 
     def reopen(self):
         """Close and reopen the repo, to make sure we are up to date."""
-
         self.repo = mercurial.hg.repository(self.ui, self.repo_path)
 
     def _file_path(self, title):
-        return os.path.join(self.path, urlquote(title, safe = ''))
+        return os.path.join(self.path, urlquote(title, safe=''))
 
     def _title_to_file(self, title):
-        return os.path.join(self.repo_prefix, urlquote(title, safe = ''))
+        return os.path.join(self.repo_prefix, urlquote(title, safe=''))
 
     def _file_to_title(self, filename):
         assert filename.startswith(self.repo_prefix)
@@ -144,8 +160,7 @@ class VersionedStorage(object):
         return urlunquote(name)
 
     def __contains__(self, title):
-        print "Checking ", title
-        return urlquote(title) in self.repo.dirstate
+        return urlquote(title) in self.repo['tip']
 
     def __iter__(self):
         return self.all_pages()
@@ -180,50 +195,44 @@ class VersionedStorage(object):
             pass
         return msg
 
-    @locked_repo
-    def save_file(self, title, file_name, author = u'', comment = u'', parent = None):
+    @with_working_copy_locked
+    @with_storage_locked
+    def save_file(self, title, file_name, **kwargs):
         """Save an existing file as specified page."""
 
-        user = author.encode('utf-8') or u'anon'.encode('utf-8')
-        text = comment.encode('utf-8') or u'comment'.encode('utf-8')
+        author = kwargs.get('author', u'anonymous').encode('utf-8')
+        comment = kwargs.get('comment', u'Empty comment.').encode('utf-8')
+        parent = kwargs.get('parent', None)
+
         repo_file = self._title_to_file(title)
         file_path = self._file_path(title)
         mercurial.util.rename(file_name, file_path)
         changectx = self._changectx()
+
         try:
             filectx_tip = changectx[repo_file]
             current_page_rev = filectx_tip.filerev()
         except mercurial.revlog.LookupError:
             self.repo.add([repo_file])
             current_page_rev = -1
-        if parent is not None and current_page_rev != parent:
-            msg = self.merge_changes(changectx, repo_file, text, user, parent)
-            user = '<wiki>'
-            text = msg.encode('utf-8')
-        self._commit([repo_file], text, user)
 
+        if parent is not None and current_page_rev != parent:
+            msg = self.merge_changes(changectx, repo_file, comment, author, parent)
+            author = '<wiki>'
+            comment = msg.encode('utf-8')
 
-    def _commit(self, files, text, user):
-        try:
-            return self.repo.commit(files = files, text = text, user = user,
-                                    force = True, empty_ok = True)
-        except TypeError:
-            # Mercurial 1.3 doesn't accept empty_ok or files parameter
-            match = mercurial.match.exact(self.repo_path, '', list(files))
-            return self.repo.commit(match = match, text = text, user = user,
-                                    force = True)
-
+        self._commit([repo_file], comment, author)
 
-    def save_data(self, title, data, author = u'', comment = u'', parent = None):
+    def save_data(self, title, data, **kwargs):
         """Save data as specified page."""
-
         try:
-            temp_path = tempfile.mkdtemp(dir = self.path)
+            temp_path = tempfile.mkdtemp(dir=self.path)
             file_path = os.path.join(temp_path, 'saved')
             f = open(file_path, "wb")
             f.write(data)
             f.close()
-            self.save_file(title, file_path, author, comment, parent)
+
+            return self.save_file(title=title, file_name=file_path, **kwargs)
         finally:
             try:
                 os.unlink(file_path)
@@ -234,25 +243,18 @@ class VersionedStorage(object):
             except OSError:
                 pass
 
-    def save_text(self, title, text, author = u'', comment = u'', parent = None):
+    def save_text(self, **kwargs):
         """Save text as specified page, encoded to charset."""
+        text = kwargs.pop('text')
+        return self.save_data(data=text.encode(self.charset), **kwargs)
 
-        data = text.encode(self.charset)
-        self.save_data(title, data, author, comment, parent)
-
-    def page_text(self, title):
-        """Read unicode text of a page."""
+    def _commit(self, files, comment, user):
+        match = mercurial.match.exact(self.repo_path, '', list(files))
+        return self.repo.commit(match=match, text=comment, user=user, force=True)
 
-        data = self.open_page(title).read()
-        text = unicode(data, self.charset, 'replace')
-        return text
-
-    def page_lines(self, page):
-        for data in page:
-            yield unicode(data, self.charset, 'replace')
-
-    @locked_repo
-    def delete_page(self, title, author = u'', comment = u''):
+    @with_working_copy_locked
+    @with_storage_locked
+    def delete_page(self, title, author=u'', comment=u''):
         user = author.encode('utf-8') or 'anon'
         text = comment.encode('utf-8') or 'deleted'
         repo_file = self._title_to_file(title)
@@ -264,109 +266,126 @@ class VersionedStorage(object):
         self.repo.remove([repo_file])
         self._commit([repo_file], text, user)
 
-    def open_page(self, title):
-        if title not in self:
-            raise DocumentNotFound()
+    def page_text(self, title, revision=None):
+        """Read unicode text of a page."""
+        ctx = self._find_filectx(title, revision)
+
+        if ctx is None:
+            raise DocumentNotFound(title)
+
+        return ctx.data().decode(self.charset, 'replace'), ctx.filerev()
+
+    def page_text_by_tag(self, title, tag):
+        """Read unicode text of a taged page."""
+        fname = self._title_to_file(title)
+        tag = u"{fname}#{tag}".format(**locals()).encode('utf-8')
 
         try:
-            return open(self._file_path(title), "rb")
-        except IOError:
-            import traceback
-            print traceback.print_exc()
-            raise DocumentNotFound()
+            ctx = self.repo[tag][fname]
+            return ctx.data().decode(self.charset, 'replace'), ctx.filerev()
+        except IndexError:
+            raise DocumentNotFound(fname)
 
+    @with_working_copy_locked
     def page_file_meta(self, title):
         """Get page's inode number, size and last modification time."""
-
         try:
-            (st_mode, st_ino, st_dev, st_nlink, st_uid, st_gid, st_size,
-             st_atime, st_mtime, st_ctime) = os.stat(self._file_path(title))
+            (_st_mode, st_ino, _st_dev, _st_nlink, _st_uid, _st_gid, st_size,
+             _st_atime, st_mtime, _st_ctime) = os.stat(self._file_path(title))
         except OSError:
             return 0, 0, 0
         return st_ino, st_size, st_mtime
 
-    def page_meta(self, title):
+    @with_working_copy_locked
+    def page_meta(self, title, revision=None):
         """Get page's revision, date, last editor and his edit comment."""
-        if not title in self:
-            raise DocumentNotFound()
+        fctx = self._find_filectx(title, revision)
 
-        filectx_tip = self._find_filectx(title)
-        if filectx_tip is None:
-            raise DocumentNotFound()
-        rev = filectx_tip.filerev()
-        filectx = filectx_tip.filectx(rev)
-        date = datetime.datetime.fromtimestamp(filectx.date()[0])
-        author = unicode(filectx.user(), "utf-8",
-                         'replace').split('<')[0].strip()
-        comment = unicode(filectx.description(), "utf-8", 'replace')
-        return rev, date, author, comment
+        if fctx is None:
+            raise DocumentNotFound(title)
+
+        return {
+            "revision": fctx.filerev(),
+            "date": datetime.datetime.fromtimestamp(fctx.date()[0]),
+            "author": fctx.user().decode("utf-8", 'replace'),
+            "comment": fctx.description().decode("utf-8", 'replace'),
+        }
 
     def repo_revision(self):
-        return self._changectx().rev()
+        return self.repo['tip'].rev()
+
+    def _changectx(self):
+        return self.repo['tip']
 
     def page_mime(self, title):
         """
         Guess page's mime type based on corresponding file name.
         Default ot text/x-wiki for files without an extension.
         """
-        return guess_type(self._file_path(title))
-
-    def _changectx(self):
-        """Get the changectx of the tip."""
-        try:
-            # This is for Mercurial 1.0
-            return self.repo.changectx()
-        except TypeError:
-            # Mercurial 1.3 (and possibly earlier) needs an argument
-            return self.repo.changectx('tip')
+        return guess_mime(self._file_path(title))
 
-    def _find_filectx(self, title):
+    def _find_filectx(self, title, rev=None):
         """Find the last revision in which the file existed."""
-
         repo_file = self._title_to_file(title)
-        changectx = self._changectx()
+        changectx = self._changectx()  # start with tip
         stack = [changectx]
+
         while repo_file not in changectx:
             if not stack:
                 return None
+
             changectx = stack.pop()
             for parent in changectx.parents():
                 if parent != changectx:
                     stack.append(parent)
-        return changectx[repo_file]
+
+        try:
+            fctx = changectx[repo_file]
+
+            if rev is not None:
+                fctx = fctx.filectx(rev)
+                fctx.filerev()
+
+            return fctx
+        except (IndexError, LookupError) as e:
+            raise DocumentNotFound(title)
 
     def page_history(self, title):
         """Iterate over the page's history."""
 
         filectx_tip = self._find_filectx(title)
-        if filectx_tip is None:
-            return
+
         maxrev = filectx_tip.filerev()
         minrev = 0
         for rev in range(maxrev, minrev - 1, -1):
             filectx = filectx_tip.filectx(rev)
             date = datetime.datetime.fromtimestamp(filectx.date()[0])
-            author = unicode(filectx.user(), "utf-8",
-                             'replace').split('<')[0].strip()
-            comment = unicode(filectx.description(), "utf-8", 'replace')
-            yield rev, date, author, comment
+            author = filectx.user().decode('utf-8', 'replace')
+            comment = filectx.description().decode("utf-8", 'replace')
+            tags = [t.rsplit('#', 1)[-1] for t in filectx.changectx().tags() if '#' in t]
 
-    def page_revision(self, title, rev):
-        """Get unicode contents of specified revision of the page."""
+            yield {
+                "version": rev,
+                "date": date,
+                "author": author,
+                "description": comment,
+                "tag": tags,
+            }
 
-        filectx_tip = self._find_filectx(title)
-        if filectx_tip is None:
-            raise DocumentNotFound()
-        try:
-            data = filectx_tip.filectx(rev).data()
-        except IndexError:
-            raise DocumentNotFound()
-        return data
+    @with_working_copy_locked
+    def add_page_tag(self, title, rev, tag, user, doctag=True):
+        ctitle = self._title_to_file(title)
+
+        if doctag:
+            tag = u"{ctitle}#{tag}".format(**locals()).encode('utf-8')
+
+        message = u"Assigned tag {tag!r} to version {rev!r} of {ctitle!r}".format(**locals()).encode('utf-8')
 
-    def revision_text(self, title, rev):
-        data = self.page_revision(title, rev)
-        text = unicode(data, self.charset, 'replace')
-        return text
+        fctx = self._find_filectx(title, rev)
+        self.repo.tag(
+            names=tag, node=fctx.node(), local=False,
+            user=user, message=message, date=None,
+        )
 
     def history(self):
         """Iterate over the history of entire wiki."""
@@ -377,9 +396,8 @@ class VersionedStorage(object):
         for wiki_rev in range(maxrev, minrev - 1, -1):
             change = self.repo.changectx(wiki_rev)
             date = datetime.datetime.fromtimestamp(change.date()[0])
-            author = unicode(change.user(), "utf-8",
-                             'replace').split('<')[0].strip()
-            comment = unicode(change.description(), "utf-8", 'replace')
+            author = change.user().decode('utf-8', 'replace')
+            comment = change.description().decode("utf-8", 'replace')
             for repo_file in change.files():
                 if repo_file.startswith(self.repo_prefix):
                     title = self._file_to_title(repo_file)
@@ -390,12 +408,9 @@ class VersionedStorage(object):
                     yield title, rev, date, author, comment
 
     def all_pages(self):
+        tip = self.repo['tip']
         """Iterate over the titles of all pages in the wiki."""
-        return [ urlunquote(filename) for filename in self.repo.dirstate]
-        #status = self.repo.status(self.repo[None], None, None, True, True, True)
-        #clean_files = status[6]
-        #for filename in clean_files:
-        #    yield
+        return [urlunquote(filename) for filename in tip]
 
     def changed_since(self, rev):
         """Return all pages that changed since specified repository revision."""