New contrib: export instrumentation info as JSON

contrib/instrumentation_as_json.py

+"""
+Module to export instrumentation information as JSON output
+"""
+from satella.instrumentation import CounterCollection, Counter, NoData
+import json
+
+def asval(cc):
+    if isinstance(cc, CounterCollection):
+        return dict(((item.name, asval(item)) for item in cc.get()))
+    elif isinstance(cc, Counter):
+        try:
+            h = cc.get_history()
+        except:
+            try:
+                h = cc.get_current()
+            except NoData:
+                h = None
+            return h
+        else:
+            f = dict(h)
+            try:
+                f['value'] = cc.get_current()
+            except:
+                f['value'] = None
+            return f
+
+def export(insmgr):
+    """Constructs a JSON string based on data from given insmgr"""
+    return json.dumps(asval(insmgr))
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