renamed sfa/plc into sfa/planetlab

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

diff --git a/sfa/planetlab/plcomponentdriver.py b/sfa/planetlab/plcomponentdriver.py
new file mode 100644 (file)
index 0000000..25f9b7a
--- /dev/null
+++ b/sfa/planetlab/plcomponentdriver.py
@@ -0,0 +1,102 @@
+import os
+import tempfile
+
+from sfa.client.sfaserverproxy import SfaServerProxy
+from sfa.planetlab.nodemanager import NodeManager
+
+from sfa.trust.credential import Credential
+from sfa.trust.certificate import Certificate, Keypair
+from sfa.trust.gid import GID
+
+####################
+class PlComponentDriver:
+    """
+    This class is the type for the toplevel 'api' object 
+    when running the component manager inside a planetlab node.
+    As such it runs an SFA-compliant interface and thus inherits SfaApi
+    However the fact that we run inside a planetlab nodes requires 
+    some tweaks as compared with a service running in the infrastructure.
+    """
+
+    def __init__ (self, config):
+        self.nodemanager = NodeManager(config)
+
+    def sliver_exists(self):
+        sliver_dict = self.nodemanager.GetXIDs()
+        ### xxx slicename is undefined
+        if slicename in sliver_dict.keys():
+            return True
+        else:
+            return False
+
+    def get_registry(self):
+        addr, port = self.config.SFA_REGISTRY_HOST, self.config.SFA_REGISTRY_PORT
+        url = "http://%(addr)s:%(port)s" % locals()
+        ### xxx this would require access to the api...
+        server = SfaServerProxy(url, self.key_file, self.cert_file)
+        return server
+
+    def get_node_key(self):
+        # this call requires no authentication,
+        # so we can generate a random keypair here
+        subject="component"
+        (kfd, keyfile) = tempfile.mkstemp()
+        (cfd, certfile) = tempfile.mkstemp()
+        key = Keypair(create=True)
+        key.save_to_file(keyfile)
+        cert = Certificate(subject=subject)
+        cert.set_issuer(key=key, subject=subject)
+        cert.set_pubkey(key)
+        cert.sign()
+        cert.save_to_file(certfile)
+        registry = self.get_registry()
+        # the registry will scp the key onto the node
+        registry.get_key_from_incoming_ip()        
+
+    # override the method in SfaApi
+    def getCredential(self):
+        """
+        Get our credential from a remote registry
+        """
+        path = self.config.SFA_DATA_DIR
+        config_dir = self.config.config_path
+        cred_filename = path + os.sep + 'node.cred'
+        try:
+            credential = Credential(filename = cred_filename)
+            return credential.save_to_string(save_parents=True)
+        except IOError:
+            node_pkey_file = config_dir + os.sep + "node.key"
+            node_gid_file = config_dir + os.sep + "node.gid"
+            cert_filename = path + os.sep + 'server.cert'
+            if not os.path.exists(node_pkey_file) or \
+               not os.path.exists(node_gid_file):
+                self.get_node_key()
+
+            # get node's hrn
+            gid = GID(filename=node_gid_file)
+            hrn = gid.get_hrn()
+            # get credential from registry
+            cert_str = Certificate(filename=cert_filename).save_to_string(save_parents=True)
+            registry = self.get_registry()
+            cred = registry.GetSelfCredential(cert_str, hrn, 'node')
+            # xxx credfile is undefined
+            Credential(string=cred).save_to_file(credfile, save_parents=True)            
+
+            return cred
+
+    def clean_key_cred(self):
+        """
+        remove the existing keypair and cred  and generate new ones
+        """
+        files = ["server.key", "server.cert", "node.cred"]
+        for f in files:
+            # xxx KEYDIR is undefined, could be meant to be "/var/lib/sfa/" from sfa_component_setup.py
+            filepath = KEYDIR + os.sep + f
+            if os.path.isfile(filepath):
+                os.unlink(f)
+
+        # install the new key pair
+        # GetCredential will take care of generating the new keypair
+        # and credential
+        self.get_node_key()
+        self.getCredential()