From 4bdfb966d98c34dc5e82d632007955d40ba71929 Mon Sep 17 00:00:00 2001
From: Evan Broder <broder@mit.edu>
Date: Mon, 4 Aug 2008 02:34:48 -0700
Subject: [PATCH] First hack at a version

---
 routefs/__init__.py            |  117 +++++++++++++++++++++++++++++++++++++++-
 routefs/examples/pyhesiodfs.py |   35 ++++++++++++
 setup.py                       |    4 +-
 3 files changed, 152 insertions(+), 4 deletions(-)
 create mode 100644 routefs/examples/__init__.py
 create mode 100755 routefs/examples/pyhesiodfs.py

diff --git a/routefs/__init__.py b/routefs/__init__.py
index a230cd5..8519a1a 100755
--- a/routefs/__init__.py
+++ b/routefs/__init__.py
@@ -1,5 +1,118 @@
 import fuse
-from fuse import Fuse
+import routes
+import errno
+import stat
 
-class RouteFS(Fuse):
+fuse.fuse_python_api = (0, 2)
+
+class RouteStat(fuse.Stat):
+    def __init__(self):
+        self.st_mode = 0
+        self.st_ino = 0
+        self.st_dev = 0
+        self.st_nlink = 0
+        self.st_uid = 0
+        self.st_gid = 0
+        self.st_size = 0
+        self.st_atime = 0
+        self.st_mtime = 0
+        self.st_ctime = 0
+
+class RouteMeta(type):
+    def __init__(cls, classname, bases, dict_):
+        super(RouteMeta, cls).__init__(classname, bases, dict_)
+        if bases != (fuse.Fuse,):
+            new_funcs = set(dict_.keys()).difference(dir(RouteFS))
+            cls.controllers([func for func in new_funcs \
+                                 if not func.startswith('_')])
+
+class RouteFS(fuse.Fuse):
+    __metaclass__ = RouteMeta
+    def __init__(self, *args, **kwargs):
+        super(RouteFS, self).__init__(*args, **kwargs)
+        
+        self.map = self.make_map()
+        self.map.create_regs(self.controller_list)
+        
+    def make_map(self):
+        m = routes.Mapper()
+        
+        m.connect(':controller')
+        
+        return m
+    
+    @classmethod
+    def controllers(cls, lst):
+        cls.controller_list = lst
+    
+    def _get_file(self, path):
+        match = self.map.match(path)
+        if match is None:
+            return
+        controller = match.pop('controller')
+        result = getattr(self, controller)(**match)
+        return result
+    
+    def readdir(self, path, offset):
+        obj = self._get_file(path)
+        if type(obj) is not Directory:
+            return
+        else:
+            for member in ['.', '..'] + obj:
+                yield fuse.Direntry(str(member))
+    
+    def getattr(self, path):
+        obj = self._get_file(path)
+        if obj is None:
+            return -errno.ENOENT
+        
+        st = RouteStat()
+        if type(obj) is Directory:
+            st.st_mode = stat.S_IFDIR | 0755
+            st.st_nlink = 2
+        elif type(obj) is Symlink:
+            st.st_mode = stat.S_IFLNK | 0777
+            st.st_nlink = 1
+            st.st_size = len(obj)
+        else:
+            st.st_mode = stat.S_IFREG | 0444
+            st.st_nlink = 1
+            st.st_size = len(obj)
+        
+        return st
+    
+    def read(self, path, length, offset):
+        obj = self._get_file(path)
+        if obj is None:
+            return -errno.ENOENT
+        elif type(obj) in (Directory, Symlink):
+            return -errno.EINVAL
+        else:
+            return obj[offset:offset + length]
+    
+    def readlink(self, path):
+        obj = self._get_file(path)
+        if type(obj) is not Symlink:
+            return -errno.EINVAL
+        else:
+            return obj
+
+class Directory(list):
+    """
+    A dummy class representing a filesystem entry that should be a
+    directory
+    """
     pass
+
+class Symlink(str):
+    """
+    A dummy class representing something that should be a symlink
+    """
+    pass
+
+def main(cls):
+    server = cls(version="%prog " + fuse.__version__,
+                 usage=fuse.Fuse.fusage,
+                 dash_s_do='setsingle')
+    server.parse(errex=1)
+    server.main()
diff --git a/routefs/examples/__init__.py b/routefs/examples/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/routefs/examples/pyhesiodfs.py b/routefs/examples/pyhesiodfs.py
new file mode 100755
index 0000000..2831a14
--- /dev/null
+++ b/routefs/examples/pyhesiodfs.py
@@ -0,0 +1,35 @@
+#!/sw/bin/python2.5
+
+import hesiod
+import routefs
+from routes import Mapper
+
+class PyHesiodFS(routefs.RouteFS):
+    def __init__(self, *args, **kwargs):
+        super(PyHesiodFS, self).__init__(*args, **kwargs)
+        
+        self.cache = {}
+    
+    def make_map(self):
+        m = Mapper()
+        m.connect('', controller='getList')
+        m.connect(':action', controller='getLocker')
+        return m
+    
+    def getLocker(self, action):
+        if action in self.cache:
+            return routefs.Symlink(self.cache[action])
+        
+        try:
+            filsys = hesiod.FilsysLookup(action).filsys[0]
+            if filsys['type'] == 'AFS':
+                self.cache[action] = filsys['location']
+                return routefs.Symlink(self.cache[action])
+        except (TypeError, KeyError, IndexError):
+            return
+    
+    def getList(self, action):
+        return routefs.Directory(self.cache.keys())
+
+if __name__ == '__main__':
+    routefs.main(PyHesiodFS)
diff --git a/setup.py b/setup.py
index 4d7f3c2..e64aad8 100755
--- a/setup.py
+++ b/setup.py
@@ -1,6 +1,6 @@
 #!/usr/bin/python
 
-from setuptools import setup
+from setuptools import setup, find_packages
 
 setup(
     name="RouteFS",
@@ -10,5 +10,5 @@ setup(
     author_email="broder@mit.edu",
     url="http://ebroder.net/code/RouteFS",
     license="MIT",
-    py_modules=['routefs'],
+    packages=find_packages()
 )
-- 
1.7.9.5