Bare bones of a config service

trustgraph-cli/scripts/tg-init-pulsar

@@ -79,6 +79,13 @@ def init(url, tenant="tg"):
         }
     })
 
+    ensure_namespace(url, tenant, "config", {
+        "retention_policies": {
+            "retentionSizeInMB": 50,
+            "retentionTimeInMinutes": -1,
+        }
+    })
+
 def main():
 
     parser = argparse.ArgumentParser(

trustgraph-flow/scripts/config-svc

@@ -0,0 +1,6 @@
+#!/usr/bin/env python3
+
+from trustgraph.config.service import run
+
+run()
+

trustgraph-flow/setup.py

@@ -73,6 +73,7 @@ setuptools.setup(
         "scripts/api-gateway",
         "scripts/chunker-recursive",
         "scripts/chunker-token",
+        "scripts/config-svc",
         "scripts/de-query-milvus",
         "scripts/de-query-pinecone",
         "scripts/de-query-qdrant",

trustgraph-flow/trustgraph/config/service/__init__.py

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

trustgraph-flow/trustgraph/config/service/__main__.py

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

trustgraph-flow/trustgraph/config/service/service.py

@@ -0,0 +1,203 @@
+
+"""
+Config service.  Fetchs an extract from the Wikipedia page
+using the API.
+"""
+
+from trustgraph.schema import ConfigItem, ConfigItems, ConfigUpdate
+from trustgraph.schema import ConfigRequest, ConfigResponse, ConfigPush
+from trustgraph.schema import config_request_queue, config_response_queue
+from trustgraph.schema import config_push_queue
+from trustgraph.log_level import LogLevel
+from trustgraph.base import ConsumerProducer
+import requests
+
+module = ".".join(__name__.split(".")[1:-1])
+
+default_input_queue = config_request_queue
+default_output_queue = config_response_queue
+default_push_queue = config_push_queue
+default_subscriber = module
+
+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)
+        push_queue = params.get("push_queue", default_push_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,
+                "push_queue": output_queue,
+                "subscriber": subscriber,
+                "input_schema": ConfigRequest,
+                "output_schema": ConfigResponse,
+                "push_schema": ConfigPush,
+            }
+        )
+
+        self.push_prod = self.client.create_producer(
+            topic=push_queue,
+            schema=JsonSchema(ConfigPush),
+        )
+
+        # FIXME: The state is held internally. This only works if there's
+        # one config service.  Should be more than one, and use a
+        # back-end state store.
+        self.config = {}
+
+    async def handle(self, msg):
+
+        v = msg.value()
+
+        # Sender-produced ID
+        id = msg.properties()["id"]
+
+        print(f"Handling {id}...", flush=True)
+
+        try:
+
+            if v.operation == "get":
+
+                if v.type in self.config:
+                    if v.key in self.config[v.type]:
+
+                        resp = ConfigResponse(
+                            value = self.config[v.type][v.key],
+                            directory = None,
+                            values = None,
+                            error = None,
+                        )
+                        await self.send(r, properties={"id": id})
+                        self.consumer.acknowledge(msg)
+
+                    else:
+
+                        resp = ConfigResponse(
+                            value=None,
+                            directory=None,
+                            values=None,
+                            error=Error(
+                                code="no-such-key",
+                                message="No such key"
+                            )
+                        )
+                        await self.send(r, properties={"id": id})
+                        self.consumer.acknowledge(msg)
+
+                else:
+
+                    resp = ConfigResponse(
+                        value=None,
+                        directory=None,
+                        values=None,
+                        error=Error(
+                            code="no-such-type",
+                            message="No such type"
+                        )
+                    )
+                    await self.send(r, properties={"id": id})
+                    self.consumer.acknowledge(msg)
+
+            elif v.operation == "list":
+
+                if v.type in self.config:
+
+                    resp = ConfigResponse(
+                        value = None,
+                        directory = list(self.config[v.type].keys())
+                        values = None,
+                        error = None,
+                    )
+                    await self.send(r, properties={"id": id})
+                    self.consumer.acknowledge(msg)
+
+                else:
+
+                    resp = ConfigResponse(
+                        value=None,
+                        directory=None,
+                        values=None,
+                        error=Error(
+                            code="no-such-type",
+                            message="No such type"
+                        )
+                    )
+                    await self.send(r, properties={"id": id})
+                    self.consumer.acknowledge(msg)
+
+            elif v.operation == "getall":
+
+                if v.type in self.config:
+
+                    resp = ConfigResponse(
+                        value = None,
+                        directory = None,
+                        values = self.config[v.type]
+                        error = None,
+                    )
+                    await self.send(r, properties={"id": id})
+                    self.consumer.acknowledge(msg)
+
+                else:
+
+                    resp = ConfigResponse(
+                        value=None,
+                        directory=None,
+                        values=None,
+                        error=Error(
+                            code="no-such-type",
+                            message="No such type"
+                        )
+                    )
+                    await self.send(r, properties={"id": id})
+                    self.consumer.acknowledge(msg)
+
+            else:
+                r = ConfigResponse(
+                    value=None,
+                    directory=None,
+                    values=None,
+                    error=Error(
+                        code="bad-operation",
+                        message="Bad operation"
+                    )
+                )
+                await self.send(r, properties={"id": id})
+                self.consumer.acknowledge(msg)
+
+        except Exception as e:
+                
+            r = LookupResponse(
+                error=Error(
+                    type = "unexpected-error",
+                    message = str(e),
+                ),
+                text=None,
+            )
+            await self.send(r, properties={"id": id})
+            self.consumer.acknowledge(msg)
+
+    @staticmethod
+    def add_args(parser):
+
+        ConsumerProducer.add_args(
+            parser, default_input_queue, default_subscriber,
+            default_output_queue,
+        )
+
+        parser.add_argument(
+            '-q', '--push-queue',
+            default=default_push_queue,
+            help=f'Config push queue (default: {default_push_queue})'
+        )
+
+def run():
+
+    Processor.launch(module, __doc__)
+