Feature/wikipedia ddg (#185)

API-side support for Wikipedia, DBpedia and internet search functions  This incorporates a refactor of the API code to break it up, separate classes for endpoints to reduce duplication

trustgraph-base/trustgraph/schema/__init__.py

@@ -9,4 +9,6 @@ from . graph import *
 from . retrieval import *
 from . metadata import *
 from . agent import *
+from . lookup import *
+
 

trustgraph-base/trustgraph/schema/lookup.py

@@ -0,0 +1,42 @@
+
+from pulsar.schema import Record, String
+
+from . types import Error, Value, Triple
+from . topic import topic
+from . metadata import Metadata
+
+############################################################################
+
+# Lookups
+
+class LookupRequest(Record):
+    kind = String()
+    term = String()
+
+class LookupResponse(Record):
+    text = String()
+    error = Error()
+
+encyclopedia_lookup_request_queue = topic(
+    'encyclopedia', kind='non-persistent', namespace='request'
+)
+encyclopedia_lookup_response_queue = topic(
+    'encyclopedia', kind='non-persistent', namespace='response', 
+)
+
+dbpedia_lookup_request_queue = topic(
+    'dbpedia', kind='non-persistent', namespace='request'
+)
+dbpedia_lookup_response_queue = topic(
+    'dbpedia', kind='non-persistent', namespace='response', 
+)
+
+internet_search_request_queue = topic(
+    'internet-search', kind='non-persistent', namespace='request'
+)
+internet_search_response_queue = topic(
+    'internet-search', kind='non-persistent', namespace='response', 
+)
+
+############################################################################
+