Version 0.3.2, rev351, Sidebar to display site infos an modify settings, Per-site upload/download bytes statistics, Deny different origin media requests, Allow 10sec to finish query modifications, Websocket display errors to client instead of disconnecting, Allow specify notification id to server-side messages, Track every command response time

plugins/Sidebar/maxminddb/file.py

@@ -0,0 +1,65 @@
+"""For internal use only. It provides a slice-like file reader."""
+
+import os
+
+try:
+    from multiprocessing import Lock
+except ImportError:
+    from threading import Lock
+
+
+class FileBuffer(object):
+
+    """A slice-able file reader"""
+
+    def __init__(self, database):
+        self._handle = open(database, 'rb')
+        self._size = os.fstat(self._handle.fileno()).st_size
+        if not hasattr(os, 'pread'):
+            self._lock = Lock()
+
+    def __getitem__(self, key):
+        if isinstance(key, slice):
+            return self._read(key.stop - key.start, key.start)
+        elif isinstance(key, int):
+            return self._read(1, key)
+        else:
+            raise TypeError("Invalid argument type.")
+
+    def rfind(self, needle, start):
+        """Reverse find needle from start"""
+        pos = self._read(self._size - start - 1, start).rfind(needle)
+        if pos == -1:
+            return pos
+        return start + pos
+
+    def size(self):
+        """Size of file"""
+        return self._size
+
+    def close(self):
+        """Close file"""
+        self._handle.close()
+
+    if hasattr(os, 'pread'):
+
+        def _read(self, buffersize, offset):
+            """read that uses pread"""
+            # pylint: disable=no-member
+            return os.pread(self._handle.fileno(), buffersize, offset)
+
+    else:
+
+        def _read(self, buffersize, offset):
+            """read with a lock
+
+            This lock is necessary as after a fork, the different processes
+            will share the same file table entry, even if we dup the fd, and
+            as such the same offsets. There does not appear to be a way to
+            duplicate the file table entry and we cannot re-open based on the
+            original path as that file may have replaced with another or
+            unlinked.
+            """
+            with self._lock:
+                self._handle.seek(offset)
+                return self._handle.read(buffersize)