Fixed a problem with the packages, api/__init__.py appeared in both (#196)

trustgraph-flow and trustgraph-base, moved the gateway stuff into a
different directory.

trustgraph-flow/trustgraph/gateway/graph_embeddings_stream.py

@@ -0,0 +1,57 @@
+
+import asyncio
+import queue
+from pulsar.schema import JsonSchema
+import uuid
+
+from ... schema import GraphEmbeddings
+from ... schema import graph_embeddings_store_queue
+
+from . subscriber import Subscriber
+from . socket import SocketEndpoint
+from . serialize import serialize_graph_embeddings
+
+class GraphEmbeddingsStreamEndpoint(SocketEndpoint):
+
+    def __init__(
+            self, pulsar_host, auth, path="/api/v1/stream/graph-embeddings"
+    ):
+
+        super(GraphEmbeddingsStreamEndpoint, self).__init__(
+            endpoint_path=path, auth=auth,
+        )
+
+        self.pulsar_host=pulsar_host
+
+        self.subscriber = Subscriber(
+            self.pulsar_host, graph_embeddings_store_queue,
+            "api-gateway", "api-gateway",
+            schema=JsonSchema(GraphEmbeddings)
+        )
+
+    async def start(self):
+
+        self.subscriber.start()
+
+    async def async_thread(self, ws, running):
+
+        id = str(uuid.uuid4())
+
+        q = self.subscriber.subscribe_all(id)
+
+        while running.get():
+            try:
+                resp = await asyncio.to_thread(q.get, timeout=0.5)
+                await ws.send_json(serialize_graph_embeddings(resp))
+
+            except queue.Empty:
+                continue
+
+            except Exception as e:
+                print(f"Exception: {str(e)}", flush=True)
+                break
+
+        self.subscriber.unsubscribe_all(id)
+
+        running.stop()
+