Support NodeContext type

Initial NodeContext implementation to support BareMetal,
Controller, Compute scenarios.

Usage:

0) install yardstick
1) mkdir -p /etc/yardstick/nodes
2) cp <yardstick_repo>/etc/yardstick/nodes/pod.yaml.sample \
       /etc/yardstick/nodes/pod.yaml
3) edit /etc/yardstick/nodes/pod.yaml (make show ip, username,
       ssh key are configured correctly)
4) yardstick -d task start \
       <yardstick_repo>/samples/ping-node-context.yaml
5) cat /tmp/yardstick.out

Design etherpad link:
    https://etherpad.opnfv.org/p/yardstick_framework

JIRA: YARDSTICK-169

Change-Id: I3f6ade8243e68d88326f23ed213edb32c638ed32
Signed-off-by: QiLiang <liangqi1@huawei.com>

1 files changed, 94 insertions, 0 deletions

diff --git a/yardstick/benchmark/contexts/node.py b/yardstick/benchmark/contexts/node.py
new file mode 100644
index 000000000..04c8e7ca3
--- /dev/null
+++ b/yardstick/benchmark/contexts/node.py
@@ -0,0 +1,94 @@
+##############################################################################
+# Copyright (c) 2015 Huawei Technologies Co.,Ltd and others.
+#
+# All rights reserved. This program and the accompanying materials
+# are made available under the terms of the Apache License, Version 2.0
+# which accompanies this distribution, and is available at
+# http://www.apache.org/licenses/LICENSE-2.0
+##############################################################################
+
+import sys
+import yaml
+import logging
+
+from yardstick.benchmark.contexts.base import Context
+
+LOG = logging.getLogger(__name__)
+
+
+class NodeContext(Context):
+    '''Class that handle nodes info'''
+
+    __context_type__ = "Node"
+
+    def __init__(self):
+        self.name = None
+        self.file_path = None
+        self.nodes = []
+        self.controllers = []
+        self.computes = []
+        self.baremetals = []
+        super(self.__class__, self).__init__()
+
+    def init(self, attrs):
+        '''initializes itself from the supplied arguments'''
+        self.name = attrs["name"]
+        self.file_path = attrs.get("file", "/etc/yardstick/nodes/pod.yaml")
+
+        LOG.info("Parsing pod file: %s", self.file_path)
+
+        try:
+            with open(self.file_path) as stream:
+                cfg = yaml.load(stream)
+        except IOError as ioerror:
+            sys.exit(ioerror)
+
+        self.nodes.extend(cfg["nodes"])
+        self.controllers.extend([node for node in cfg["nodes"]
+                                if node["role"] == "Controller"])
+        self.computes.extend([node for node in cfg["nodes"]
+                             if node["role"] == "Compute"])
+        self.baremetals.extend([node for node in cfg["nodes"]
+                               if node["role"] == "Baremetal"])
+        LOG.debug("Nodes: %r", self.nodes)
+        LOG.debug("Controllers: %r", self.controllers)
+        LOG.debug("Computes: %r", self.computes)
+        LOG.debug("BareMetals: %r", self.baremetals)
+
+    def deploy(self):
+        '''don't need to deploy'''
+        pass
+
+    def undeploy(self):
+        '''don't need to undeploy'''
+        pass
+
+    def _get_server(self, attr_name):
+        '''lookup server info by name from context
+        attr_name: a name for a server listed in nodes config file
+        '''
+        if type(attr_name) is dict:
+            return None
+
+        if self.name != attr_name.split(".")[1]:
+            return None
+        node_name = attr_name.split(".")[0]
+        nodes = [n for n in self.nodes
+                 if n["name"] == node_name]
+        if len(nodes) == 0:
+            return None
+        elif len(nodes) > 1:
+            LOG.error("Duplicate nodes!!!")
+            LOG.error("Nodes: %r" % nodes)
+            sys.exit(-1)
+
+        node = nodes[0]
+
+        server = {
+            "name": attr_name,
+            "ip": node["ip"],
+            "user": node["user"],
+            "key_filename": node["key_filename"]
+        }
+
+        return server