renamed sfa/plc into sfa/planetlab

[sfa.git] / sfa / planetlab / vlink.py

diff --git a/sfa/planetlab/vlink.py b/sfa/planetlab/vlink.py
new file mode 100644 (file)
index 0000000..625963d
--- /dev/null
+++ b/sfa/planetlab/vlink.py
@@ -0,0 +1,115 @@
+import re
+from sfa.util.xrn import Xrn
+# Taken from bwlimit.py
+#
+# See tc_util.c and http://physics.nist.gov/cuu/Units/binary.html. Be
+# warned that older versions of tc interpret "kbps", "mbps", "mbit",
+# and "kbit" to mean (in this system) "kibps", "mibps", "mibit", and
+# "kibit" and that if an older version is installed, all rates will
+# be off by a small fraction.
+suffixes = {
+    "":         1,
+    "bit":  1,
+    "kibit":    1024,
+    "kbit": 1000,
+    "mibit":    1024*1024,
+    "mbit": 1000000,
+    "gibit":    1024*1024*1024,
+    "gbit": 1000000000,
+    "tibit":    1024*1024*1024*1024,
+    "tbit": 1000000000000,
+    "bps":  8,
+    "kibps":    8*1024,
+    "kbps": 8000,
+    "mibps":    8*1024*1024,
+    "mbps": 8000000,
+    "gibps":    8*1024*1024*1024,
+    "gbps": 8000000000,
+    "tibps":    8*1024*1024*1024*1024,
+    "tbps": 8000000000000
+}
+
+
+def get_tc_rate(s):
+    """
+    Parses an integer or a tc rate string (e.g., 1.5mbit) into bits/second
+    """
+
+    if type(s) == int:
+        return s
+    m = re.match(r"([0-9.]+)(\D*)", s)
+    if m is None:
+        return -1
+    suffix = m.group(2).lower()
+    if suffixes.has_key(suffix):
+        return int(float(m.group(1)) * suffixes[suffix])
+    else:
+        return -1
+
+def format_tc_rate(rate):
+    """
+    Formats a bits/second rate into a tc rate string
+    """
+
+    if rate >= 1000000000 and (rate % 1000000000) == 0:
+        return "%.0fgbit" % (rate / 1000000000.)
+    elif rate >= 1000000 and (rate % 1000000) == 0:
+        return "%.0fmbit" % (rate / 1000000.)
+    elif rate >= 1000:
+        return "%.0fkbit" % (rate / 1000.)
+    else:
+        return "%.0fbit" % rate
+
+class VLink:
+    @staticmethod
+    def get_link_id(if1, if2):
+        if if1['id'] < if2['id']:
+            link = (if1['id']<<7) + if2['id']
+        else:
+            link = (if2['id']<<7) + if1['id']
+        return link
+
+    @staticmethod
+    def get_iface_id(if1, if2):
+        if if1['id'] < if2['id']:
+            iface = 1
+        else:
+            iface = 2
+        return iface
+
+    @staticmethod
+    def get_virt_ip(if1, if2):
+        link_id = VLink.get_link_id(if1, if2)
+        iface_id = VLink.get_iface_id(if1, if2)
+        first = link_id >> 6
+        second = ((link_id & 0x3f)<<2) + iface_id
+        return "192.168.%d.%s" % (first, second)
+
+    @staticmethod
+    def get_virt_net(link):
+        link_id = VLink.get_link_id(link['interface1'], link['interface2'])
+        first = link_id >> 6
+        second = (link_id & 0x3f)<<2
+        return "192.168.%d.%d/30" % (first, second)
+
+    @staticmethod
+    def get_interface_id(interface):
+        if_name = Xrn(interface['component_id']).get_leaf()
+        node, dev = if_name.split(":")
+        node_id = int(node.replace("node", ""))
+        return node_id
+
+        
+    @staticmethod
+    def get_topo_rspec(link, ipaddr):
+        link['interface1']['id'] = VLink.get_interface_id(link['interface1'])
+        link['interface2']['id'] = VLink.get_interface_id(link['interface2'])
+        my_ip = VLink.get_virt_ip(link['interface1'], link['interface2'])
+        remote_ip = VLink.get_virt_ip(link['interface2'], link['interface1'])
+        net = VLink.get_virt_net(link)
+        bw = format_tc_rate(long(link['capacity']))
+        return (link['interface2']['id'], ipaddr, bw, my_ip, remote_ip, net)
+
+    @staticmethod 
+    def topo_rspec_to_link(topo_rspec):
+        pass