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"""list based, symlink aware fs listdir caching implementation"""
import os,stat,weakref
def norm_path(mypath):
newpath = os.path.normpath(mypath)
if len(mypath) > 1:
if newpath[:2] == "//":
newpath=newpath.replace("//","/")
return newpath
def abs_link(sym):
# note this doesn't parse every single entry. that's up to you.
l=os.readlink(sym)
if l[0] != '/':
l = os.path.dirname(sym)+"/"+l
return norm_path(l)
class node:
"""class representing a directory"""
__slots__=["dir_node_name","dir_node_ref","dirs","files","others","sdirs","sfiles","mtime"]
# instances = 0
def __init__(self):#,dirs=[],others=[],files=[],mtime=-1):
self.dir_node_ref=[]
self.dir_node_name=[]
self.dirs=[]
self.files=[]
self.others=[]
self.sdirs=[]
self.sfiles=[]
self.mtime=-1
# def __del__(self):
# print "del'ing a node"
# del self.dir_node_n
# del self.sdirs
# del self.sfiles
# del self.dirs
# del self.files
# del self.others
# del self.mtime
def get_node(self,nnode):
"""retrieve directory node if exists"""
try:
x=self.dir_node_name.index(nnode)
return self.dir_node_ref[x]
except (ReferenceError,ValueError),e :
# print "ref exception",e
return None
def add_node(self,nnode,ref_node=None,symlink=False):
self.dir_node_name.append(nnode)
if ref_node:
if symlink:
self.dir_node_ref.append(weakref.proxy(ref_node))
else:
self.dir_node_ref.append(ref_node)
else:
self.dir_node_ref.append(node())
return self.dir_node_ref[-1]
def del_node(self,nnode):
try:
x=self.dir_node_name.index(nnode)
del self.dir_node_name[x]
del self.dir_node_ref[x]
except Exception,e:
print "warning, dcache was asked to delete a non_existant node: lacks node %s" % nnode
print "e=",e
def rec_del_node(self):
while len(self.dir_node_n):
self.dir_node_name[0].rec_del_node()
del self.dir_node_name[0][0]
del self.dir_node_ref[0]
class dcache:
def __init__(self):
self.cache=node()
def _get_dir_ent(self, mypath,symlink=False):
p=mypath.split("/")
if not p[0]:
p = p[1:]
if not p[-1]:
p = p[0:-1]
fullpath=''
c = self.cache
if not len(p):
return self.cache
while len(p):
fullpath += '/' + p[0]
g=c.get_node(p[0])
if not g:
st=os.lstat(fullpath)
if stat.S_ISLNK(st.st_mode):
# yippee
fullpath=abs_link(fullpath)
# print "hijacking %s to %s" % (p[0], fullpath)
g=self._get_dir_ent(fullpath)
g=c.add_node(p[0],ref_node=self._get_dir_ent(fullpath))
elif stat.S_ISDIR(st.st_mode):
g=c.add_node(p[0])
else:
raise Exception("%s is not a dir!" % fullpath)
c=g
p.pop(0)
if symlink:
c["actpath"]=fullpath
return c
def cacheddir(self, mypath):
mypath=norm_path(mypath)
if mypath=="/":
ent=self.cache
else:
ent = self._get_dir_ent(mypath)
# print "nodes mtime=",ent.mtime
listing_needed = (ent.mtime == -1)
mtime = os.stat(mypath).st_mtime
if not listing_needed:
# print "nost listing needed"
if mtime != ent.mtime:
print "mtime flipped it"
self._invalidate_dir_node(ent)
listing_needed = True
# print "ent = ",ent,"listing_needed=",listing_needed
if listing_needed:
ent.mtime=mtime
# print "set nodes mtime to",ent.mtime,"from",mtime
l = os.listdir(mypath)
for x in l:
try:
ps=os.lstat(mypath+"/"+x).st_mode
if stat.S_ISREG(ps):
ent.files.append(x)
elif stat.S_ISDIR(ps):
ent.dirs.append(x)
elif stat.S_ISLNK(ps):
ps=os.stat(mypath+"/"+x).st_mode
if stat.S_ISDIR(ps):
ent.sdirs.append(x)
else:
ent.sfiles.append(x)
else:
ent.others.append(x)
except:
ent.others.append(x)
return list(ent.dirs + ent.sdirs + ent.files + ent.sfiles + ent.others),\
[1 for x in ent.dirs]+[3 for x in ent.sdirs]+ \
[0 for x in ent.files]+ [2 for x in ent.sfiles]+[4 for x in ent.others]
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