From: Zooko O'Whielacronx <zooko@zooko.com>
Date: Mon, 8 Dec 2008 23:57:25 +0000 (-0700)
Subject: introducer: simplify get_permuted_peers() implementation and add get_peers()
X-Git-Url: https://git.rkrishnan.org/pf/content//%22file:/%22?a=commitdiff_plain;h=a84581fcff07adf56a138010f7cf1f22ca788916;p=tahoe-lafs%2Ftahoe-lafs.git

introducer: simplify get_permuted_peers() implementation and add get_peers()
---

diff --git a/src/allmydata/introducer/client.py b/src/allmydata/introducer/client.py
index 8b59c9cc..6abe5bc4 100644
--- a/src/allmydata/introducer/client.py
+++ b/src/allmydata/introducer/client.py
@@ -295,21 +295,16 @@ class IntroducerClient(service.Service, Referenceable):
                           for c in self._connections
                           if c[1] == service_name])
 
+    def get_peers(self, service_name):
+        """Return a set of (peerid, versioned-rref) tuples."""
+        return frozenset([(pid, r) for (pid, servname, r) in self._connections if servname == servname])
+
     def get_permuted_peers(self, service_name, key):
         """Return an ordered list of (peerid, versioned-rref) tuples."""
 
-        results = []
-        for (c_peerid, c_service_name, rref) in self._connections:
-            assert isinstance(c_peerid, str)
-            if c_service_name != service_name:
-                continue
-            permuted = sha.new(key + c_peerid).digest()
-            results.append((permuted, c_peerid, rref))
-
-        results.sort(lambda a,b: cmp(a[0], b[0]))
-        return [ (r[1], r[2]) for r in results ]
-
+        servers = self.get_peers(service_name)
 
+        return sorted(servers, key=lambda x: sha.new(key+x[0]).digest())
 
     def remote_set_encoding_parameters(self, parameters):
         self.encoding_parameters = parameters