X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=sfa%2Futil%2Fxrn.py;h=8ee833150e9da0bcfea82a2c058cde62e541e9ea;hb=ecc85e0b923922cf7117d29b380f5284edb88f21;hp=30427c8a65a8e17d0552c3764e8399b2c6c3975f;hpb=9460753fc7b8a72aa9beefeba34ab315c742d060;p=sfa.git

diff --git a/sfa/util/xrn.py b/sfa/util/xrn.py
index 30427c8a..6198f83c 100644
--- a/sfa/util/xrn.py
+++ b/sfa/util/xrn.py
@@ -1,13 +1,36 @@
+#----------------------------------------------------------------------
+# Copyright (c) 2008 Board of Trustees, Princeton University
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and/or hardware specification (the "Work") to
+# deal in the Work without restriction, including without limitation the
+# rights to use, copy, modify, merge, publish, distribute, sublicense,
+# and/or sell copies of the Work, and to permit persons to whom the Work
+# is furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Work.
+#
+# THE WORK IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 
+# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 
+# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 
+# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
+# OUT OF OR IN CONNECTION WITH THE WORK OR THE USE OR OTHER DEALINGS 
+# IN THE WORK.
+#----------------------------------------------------------------------
+
 import re
 
-from sfa.util.faults import *
-from sfa.util.sfalogging import sfa_logger
+from sfa.util.faults import SfaAPIError
 
-# for convenience and smoother translation
-def get_leaf(hrn): return Xrn(hrn=hrn,type='any').get_leaf()
-def get_authority(hrn): return Xrn(hrn=hrn,type='any').get_authority_hrn()
-def urn_to_hrn(urn): xrn=Xrn(urn=urn); return (xrn.hrn, xrn.type)
-def hrn_to_urn(hrn,type): return Xrn(hrn=hrn, type=type).urn
+# for convenience and smoother translation - we should get rid of these functions eventually 
+def get_leaf(hrn): return Xrn(hrn).get_leaf()
+def get_authority(hrn): return Xrn(hrn).get_authority_hrn()
+def urn_to_hrn(urn): xrn=Xrn(urn); return (xrn.hrn, xrn.type)
+def hrn_to_urn(hrn,type): return Xrn(hrn, type=type).urn
+def hrn_authfor_hrn(parenthrn, hrn): return Xrn.hrn_is_auth_for_hrn(parenthrn, hrn)
 
 class Xrn:
 
@@ -23,90 +46,198 @@ class Xrn:
     @staticmethod
     def hrn_leaf(hrn): return Xrn.hrn_split(hrn)[-1]
 
-    # e.g. hrn_path_list ('a\.b.c.d') -> ['a\.b', 'c']
+    # e.g. hrn_auth_list ('a\.b.c.d') -> ['a\.b', 'c']
     @staticmethod
-    def hrn_path_list(hrn): return Xrn.hrn_split(hrn)[0:-1]
+    def hrn_auth_list(hrn): return Xrn.hrn_split(hrn)[0:-1]
     
-    # e.g. hrn_path ('a\.b.c.d') -> 'a\.b.c'
+    # e.g. hrn_auth ('a\.b.c.d') -> 'a\.b.c'
     @staticmethod
-    def hrn_path(hrn): return '.'.join(Xrn.hrn_path_list(hrn))
+    def hrn_auth(hrn): return '.'.join(Xrn.hrn_auth_list(hrn))
     
     # e.g. escape ('a.b') -> 'a\.b'
     @staticmethod
     def escape(token): return re.sub(r'([^\\])\.', r'\1\.', token)
+
     # e.g. unescape ('a\.b') -> 'a.b'
     @staticmethod
     def unescape(token): return token.replace('\\.','.')
-        
-    URN_PREFIX = "urn:publicid:IDN"
+
+    # Return the HRN authority chain from top to bottom.
+    # e.g. hrn_auth_chain('a\.b.c.d') -> ['a\.b', 'a\.b.c']
+    @staticmethod
+    def hrn_auth_chain(hrn):
+        parts = Xrn.hrn_auth_list(hrn)
+        chain = []
+        for i in range(len(parts)):
+            chain.append('.'.join(parts[:i+1]))
+        # Include the HRN itself?
+        #chain.append(hrn)
+        return chain
+
+    # Is the given HRN a true authority over the namespace of the other
+    # child HRN?
+    # A better alternative than childHRN.startswith(parentHRN)
+    # e.g. hrn_is_auth_for_hrn('a\.b', 'a\.b.c.d') -> True,
+    # but hrn_is_auth_for_hrn('a', 'a\.b.c.d') -> False
+    # Also hrn_is_auth_for_hrn('a\.b.c.d', 'a\.b.c.d') -> True
+    @staticmethod
+    def hrn_is_auth_for_hrn(parenthrn, hrn):
+        if parenthrn == hrn:
+            return True
+        for auth in Xrn.hrn_auth_chain(hrn):
+            if parenthrn == auth:
+                return True
+        return False
 
     ########## basic tools on URNs
+    URN_PREFIX = "urn:publicid:IDN"
+    URN_PREFIX_lower = "urn:publicid:idn"
+
+    @staticmethod
+    def is_urn (text):
+        return text.lower().startswith(Xrn.URN_PREFIX_lower)
+
     @staticmethod
     def urn_full (urn):
-        if urn.startswith(Xrn.URN_PREFIX): return urn
-        else: return Xrn.URN_PREFIX+URN
+        if Xrn.is_urn(urn): return urn
+        else: return Xrn.URN_PREFIX+urn
     @staticmethod
     def urn_meaningful (urn):
-        if urn.startswith(Xrn.URN_PREFIX): return urn[len(Xrn.URN_PREFIX):]
+        if Xrn.is_urn(urn): return urn[len(Xrn.URN_PREFIX):]
         else: return urn
     @staticmethod
     def urn_split (urn):
         return Xrn.urn_meaningful(urn).split('+')
 
+    @staticmethod
+    def filter_type(urns=None, type=None):
+        if urns is None: urns=[]
+        urn_list = []
+        if not type:
+            return urns
+
+        for urn in urns:
+            xrn = Xrn(xrn=urn)
+            if (xrn.type == type):
+                # Xrn is probably a urn so we can just compare types  
+                urn_list.append(urn)
+        return urn_list
+    ####################
+    # the local fields that are kept consistent
+    # self.urn
+    # self.hrn
+    # self.type
+    # self.path
     # provide either urn, or (hrn + type)
-    def __init__ (self, urn=None, hrn=None, type=None):
-        if urn: 
-            self.urn=urn
+    def __init__ (self, xrn="", type=None, id=None):
+        if not xrn: xrn = ""
+        # user has specified xrn : guess if urn or hrn
+        self.id = id
+        if Xrn.is_urn(xrn):
+            self.hrn=None
+            self.urn=xrn
+            if id:
+                self.urn = "%s:%s" % (self.urn, str(id))
             self.urn_to_hrn()
-        elif hrn and type: 
-            self.hrn=hrn
+        else:
+            self.urn=None
+            self.hrn=xrn
             self.type=type
             self.hrn_to_urn()
-        else:
-            raise SfaAPIError,"Xrn.__init__"
+        self._normalize()
+# happens all the time ..
+#        if not type:
+#            debug_logger.debug("type-less Xrn's are not safe")
+
+    def __repr__ (self):
+        result="<XRN u=%s h=%s"%(self.urn,self.hrn)
+        if hasattr(self,'leaf'): result += " leaf=%s"%self.leaf
+        if hasattr(self,'authority'): result += " auth=%s"%self.authority
+        result += ">"
+        return result
 
     def get_urn(self): return self.urn
-    def get_hrn(self): return (self.hrn, self.type)
+    def get_hrn(self): return self.hrn
+    def get_type(self): return self.type
+    def get_hrn_type(self): return (self.hrn, self.type)
 
-    def get_leaf(self):
-        if not self.hrn: raise SfaAPIError, "Xrn.get_leaf"
+    def _normalize(self):
+        if self.hrn is None: raise SfaAPIError("Xrn._normalize")
         if not hasattr(self,'leaf'): 
             self.leaf=Xrn.hrn_split(self.hrn)[-1]
-        return self.leaf
-
-    def get_authority_hrn(self): 
-        if not self.hrn: raise SfaAPIError, "Xrn.get_authority_hrn"
         # self.authority keeps a list
         if not hasattr(self,'authority'): 
-            self.authority=Xrn.hrn_path_list(self.hrn)
+            self.authority=Xrn.hrn_auth_list(self.hrn)
+
+    def get_leaf(self):
+        self._normalize()
+        return self.leaf
+
+    def get_authority_hrn(self):
+        self._normalize()
         return '.'.join( self.authority )
     
     def get_authority_urn(self): 
-        if not self.hrn: raise SfaAPIError, "Xrn.get_authority_urn"
-        # self.authority keeps a list
-        if not hasattr(self,'authority'): 
-            self.authority=Xrn.hrn_path_list(self.hrn)
+        self._normalize()
         return ':'.join( [Xrn.unescape(x) for x in self.authority] )
-    
+
+    def set_authority(self, authority):
+        """
+        update the authority section of an existing urn
+        """
+        authority_hrn = self.get_authority_hrn()
+        if not authority_hrn.startswith(authority):
+            hrn = ".".join([authority,authority_hrn, self.get_leaf()])
+        else:
+            hrn = ".".join([authority_hrn, self.get_leaf()])
+            
+        self.hrn = hrn 
+        self.hrn_to_urn()
+        self._normalize()
+
+    # sliver_id_parts is list that contains the sliver's 
+    # slice id and node id 
+    def get_sliver_id_parts(self):
+        sliver_id_parts = []
+        if self.type == 'sliver' or '-' in self.leaf:
+            sliver_id_parts = self.leaf.split('-')
+        return sliver_id_parts
+        
+        
     def urn_to_hrn(self):
         """
         compute tuple (hrn, type) from urn
         """
         
-        if not self.urn or not self.urn.startswith(Xrn.URN_PREFIX):
-            raise SfaAPIError, "Xrn.urn_to_hrn"
+#        if not self.urn or not self.urn.startswith(Xrn.URN_PREFIX):
+        if not Xrn.is_urn(self.urn):
+            raise SfaAPIError("Xrn.urn_to_hrn")
 
         parts = Xrn.urn_split(self.urn)
         type=parts.pop(2)
         # Remove the authority name (e.g. '.sa')
-        if type == 'authority': parts.pop()
-
+        if type == 'authority':
+            name = parts.pop()
+            # Drop the sa. This is a bad hack, but its either this
+            # or completely change how record types are generated/stored   
+            if name != 'sa':
+                type = type + "+" + name
+            name =""
+        else:
+            name = parts.pop(len(parts)-1)
         # convert parts (list) into hrn (str) by doing the following
         # 1. remove blank parts
         # 2. escape dots inside parts
         # 3. replace ':' with '.' inside parts
-        # 3. join parts using '.' 
-        hrn = '.'.join([Xrn.escape(part).replace(':','.') for part in parts if part]) 
+        # 3. join parts using '.'
+        hrn = '.'.join([Xrn.escape(part).replace(':','.') for part in parts if part])
+        # dont replace ':' in the name section
+        if name:
+            parts = name.split(':')
+            if len(parts) > 1:
+                self.id = ":".join(parts[1:])
+                name = parts[0]    
+            hrn += '.%s' % Xrn.escape(name) 
 
         self.hrn=str(hrn)
         self.type=str(type)
@@ -116,23 +247,35 @@ class Xrn:
         compute urn from (hrn, type)
         """
 
-        if not self.hrn or self.hrn.startswith(Xrn.URN_PREFIX):
-            raise SfaAPIError, "Xrn.hrn_to_urn"
+#        if not self.hrn or self.hrn.startswith(Xrn.URN_PREFIX):
+        if Xrn.is_urn(self.hrn):
+            raise SfaAPIError("Xrn.hrn_to_urn, hrn=%s"%self.hrn)
 
-        if self.type == 'authority':
-            self.authority = Xrn.hrn_split(self.hrn)
-            name = 'sa'   
+        if self.type and self.type.startswith('authority'):
+            self.authority = Xrn.hrn_auth_list(self.hrn)
+            leaf = self.get_leaf()
+            #if not self.authority:
+            #    self.authority = [self.hrn]
+            type_parts = self.type.split("+")
+            self.type = type_parts[0]
+            name = 'sa'
+            if len(type_parts) > 1:
+                name = type_parts[1]
+            auth_parts = [part for part in [self.get_authority_urn(), leaf] if part]
+            authority_string = ":".join(auth_parts)
         else:
-            self.authority = Xrn.hrn_path_list(self.hrn)
+            self.authority = Xrn.hrn_auth_list(self.hrn)
             name = Xrn.hrn_leaf(self.hrn)
-
-        authority_string = self.get_authority_urn()
+            authority_string = self.get_authority_urn()
 
         if self.type == None:
-            urn = "+".join(['',authority_string,name])
+            urn = "+".join(['',authority_string,Xrn.unescape(name)])
         else:
-            urn = "+".join(['',authority_string,self.type,name])
-        
+            urn = "+".join(['',authority_string,self.type,Xrn.unescape(name)])
+
+        if hasattr(self, 'id') and self.id:
+            urn = "%s:%s" % (urn, self.id)        
+
         self.urn = Xrn.URN_PREFIX + urn
 
     def dump_string(self):