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-flow/trustgraph/external/wikipedia/__init__.py

@@ -0,0 +1,3 @@
+
+from . service import *
+

trustgraph-flow/trustgraph/external/wikipedia/__main__.py

@@ -0,0 +1,7 @@
+#!/usr/bin/env python3
+
+from . service import run
+
+if __name__ == '__main__':
+    run()
+

trustgraph-flow/trustgraph/external/wikipedia/service.py

@@ -0,0 +1,102 @@
+
+"""
+Wikipedia lookup service.  Fetchs an extract from the Wikipedia page
+using the API.
+"""
+
+from trustgraph.schema import LookupRequest, LookupResponse, Error
+from trustgraph.schema import encyclopedia_lookup_request_queue
+from trustgraph.schema import encyclopedia_lookup_response_queue
+from trustgraph.log_level import LogLevel
+from trustgraph.base import ConsumerProducer
+import requests
+
+module = ".".join(__name__.split(".")[1:-1])
+
+default_input_queue = encyclopedia_lookup_request_queue
+default_output_queue = encyclopedia_lookup_response_queue
+default_subscriber = module
+default_url="https://en.wikipedia.org/"
+
+class Processor(ConsumerProducer):
+
+    def __init__(self, **params):
+
+        input_queue = params.get("input_queue", default_input_queue)
+        output_queue = params.get("output_queue", default_output_queue)
+        subscriber = params.get("subscriber", default_subscriber)
+        url = params.get("url", default_url)
+
+        super(Processor, self).__init__(
+            **params | {
+                "input_queue": input_queue,
+                "output_queue": output_queue,
+                "subscriber": subscriber,
+                "input_schema": LookupRequest,
+                "output_schema": LookupResponse,
+            }
+        )
+
+        self.url = url
+
+    def handle(self, msg):
+
+        v = msg.value()
+
+        # Sender-produced ID
+        id = msg.properties()["id"]
+
+        print(f"Handling {v.kind} / {v.term}...", flush=True)
+
+        try:
+
+            url = f"{self.url}/api/rest_v1/page/summary/{v.term}"
+
+            resp = Result = requests.get(url).json()
+            resp = resp["extract"]
+
+            r = LookupResponse(
+                error=None,
+                text=resp
+            )
+
+            self.producer.send(r, properties={"id": id})
+
+            self.consumer.acknowledge(msg)
+
+            return
+
+        except Exception as e:
+                
+            r = LookupResponse(
+                error=Error(
+                    type = "lookup-error",
+                    message = str(e),
+                ),
+                text=None,
+            )
+            self.producer.send(r, properties={"id": id})
+
+            self.consumer.acknowledge(msg)
+
+            return
+            
+
+    @staticmethod
+    def add_args(parser):
+
+        ConsumerProducer.add_args(
+            parser, default_input_queue, default_subscriber,
+            default_output_queue,
+        )
+
+        parser.add_argument(
+            '-u', '--url',
+            default=default_url,
+            help=f'LLM model (default: {default_url})'
+        )
+
+def run():
+
+    Processor.start(module, __doc__)
+