Ohai: Implement Ohai plugin

The Ohai plugin runs the Ohai system profiler through the probes interface, stores the information
on the server, and makes it available for metadata operations.

git-svn-id: https://svn.mcs.anl.gov/repos/bcfg/trunk/bcfg2@5348 ce84e21b-d406-0410-9b95-82705330c041

2 files changed, 59 insertions, 1 deletions

diff --git a/src/lib/Server/Plugins/Ohai.py b/src/lib/Server/Plugins/Ohai.py
new file mode 100644
index 000000000..ea31b4460
--- /dev/null
+++ b/src/lib/Server/Plugins/Ohai.py
@@ -0,0 +1,58 @@
+
+import json
+import lxml.etree
+import os
+import Bcfg2.Server.Plugin
+
+class OhaiCache(object):
+    def __init__(self, dirname):
+        self.dirname = dirname
+        self.cache = dict()
+
+    def __setitem__(self, item, value):
+        self.cache[item] = json.loads(value)
+        file("%s/%s.json" % (self.dirname, item), 'w').write(value)        
+
+    def __getitem__(self, item):
+        if item not in self.cache:
+            try:
+                data = open("%s/%s.json" % (self.dirname, item)).read()
+            except:
+                raise KeyError, item
+            self.cache[item] = json.loads(data)
+        return self.cache[item]
+
+    def __iter__(self):
+        data = self.cache.keys()
+        data.extend([x[:-5] for x in os.listdir(self.dirname)])
+        return data.__iter__()
+
+class Ohai(Bcfg2.Server.Plugin.Plugin,
+           Bcfg2.Server.Plugin.Probing,
+           Bcfg2.Server.Plugin.Connector):
+    name = 'Ohai'
+    experimental = True
+
+    def __init__(self, core, datastore):
+        Bcfg2.Server.Plugin.Plugin.__init__(self, core, datastore)
+        Bcfg2.Server.Plugin.Probing.__init__(self)
+        Bcfg2.Server.Plugin.Connector.__init__(self)
+        self.probe = lxml.etree.Element('probe', name='Ohai', source='Ohai',
+                                        interpreter='/bin/sh')
+        self.probe.text = 'ohai'
+        try:
+            os.stat(self.data)
+        except:
+            self.make_path(self.data)
+        self.cache = OhaiCache(self.data)
+
+    def GetProbes(self, meta, force=False):
+        return [self.probe]
+
+    def ReceiveData(self, meta, datalist):
+        self.cache[meta.hostname] = datalist[0].text
+
+    def get_additional_data(self, meta):
+        if meta.hostname in self.cache:
+            return self.cache[meta.hostname]
+        return dict()
diff --git a/src/lib/Server/Plugins/__init__.py b/src/lib/Server/Plugins/__init__.py
index a8e7c3f63..c95f6714d 100644
--- a/src/lib/Server/Plugins/__init__.py
+++ b/src/lib/Server/Plugins/__init__.py
@@ -5,4 +5,4 @@ __all__ = ['Account', 'Base', 'Bundler', 'Cfg', 'Decisions', 'GBundler', 'Git',
            'Hostbase', 'Metadata', 'NagiosGen', 'Packages', 'Properties',
            'Probes', 'Pkgmgr', 'Rules', 'SSHbase', 'Snapshots' 'Statistics',
 	   'Svcmgr', 'Svn', 'TCheetah', 'Trigger', 'SGenshi', 'TGenshi',
-           'GroupPatterns']
+           'GroupPatterns', 'Ohai']