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Feature/config service (#332)
Configuration service provides an API to change configuration. Complete configuration is pushed down a config queue so that users have a complete copy of config object.
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cybermaggedon
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17 changed files with 1002 additions and 5 deletions
3
trustgraph-flow/trustgraph/config/service/__init__.py
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trustgraph-flow/trustgraph/config/service/__init__.py
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from . service import *
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7
trustgraph-flow/trustgraph/config/service/__main__.py
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7
trustgraph-flow/trustgraph/config/service/__main__.py
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#!/usr/bin/env python3
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from . service import run
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if __name__ == '__main__':
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run()
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312
trustgraph-flow/trustgraph/config/service/service.py
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312
trustgraph-flow/trustgraph/config/service/service.py
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"""
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Config service. Fetchs an extract from the Wikipedia page
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using the API.
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"""
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from pulsar.schema import JsonSchema
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from trustgraph.schema import ConfigRequest, ConfigResponse, ConfigPush
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from trustgraph.schema import ConfigValue, Error
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from trustgraph.schema import config_request_queue, config_response_queue
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from trustgraph.schema import config_push_queue
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from trustgraph.log_level import LogLevel
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from trustgraph.base import ConsumerProducer
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module = ".".join(__name__.split(".")[1:-1])
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default_input_queue = config_request_queue
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default_output_queue = config_response_queue
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default_push_queue = config_push_queue
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default_subscriber = module
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# This behaves just like a dict, should be easier to add persistent storage
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# later
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class ConfigurationItems(dict):
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pass
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class Configuration(dict):
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def __getitem__(self, key):
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if key not in self:
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self[key] = ConfigurationItems()
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return dict.__getitem__(self, key)
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class Processor(ConsumerProducer):
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def __init__(self, **params):
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input_queue = params.get("input_queue", default_input_queue)
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output_queue = params.get("output_queue", default_output_queue)
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push_queue = params.get("push_queue", default_push_queue)
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subscriber = params.get("subscriber", default_subscriber)
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super(Processor, self).__init__(
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**params | {
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"input_queue": input_queue,
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"output_queue": output_queue,
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"push_queue": output_queue,
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"subscriber": subscriber,
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"input_schema": ConfigRequest,
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"output_schema": ConfigResponse,
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"push_schema": ConfigPush,
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}
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)
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self.push_prod = self.client.create_producer(
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topic=push_queue,
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schema=JsonSchema(ConfigPush),
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)
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# FIXME: The state is held internally. This only works if there's
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# one config service. Should be more than one, and use a
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# back-end state store.
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self.config = Configuration()
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# Version counter
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self.version = 0
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async def start(self):
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await self.push()
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async def handle_get(self, v, id):
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for k in v.keys:
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if k.type not in self.config or k.key not in self.config[k.type]:
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return ConfigResponse(
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version = None,
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values = None,
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directory = None,
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config = None,
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error = Error(
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code = "key-error",
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message = f"Key error"
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)
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)
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values = [
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ConfigValue(
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type = k.type,
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key = k.key,
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value = self.config[k.type][k.key]
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)
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for k in v.keys
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]
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return ConfigResponse(
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version = self.version,
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values = values,
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directory = None,
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config = None,
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error = None,
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)
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async def handle_list(self, v, id):
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if v.type not in self.config:
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return ConfigResponse(
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version = None,
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values = None,
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directory = None,
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config = None,
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error = Error(
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code="key-error",
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message="No such type",
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),
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)
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return ConfigResponse(
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version = self.version,
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values = None,
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directory = list(self.config[v.type].keys()),
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config = None,
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error = None,
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)
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async def handle_getvalues(self, v, id):
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if v.type not in self.config:
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return ConfigResponse(
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version = None,
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values = None,
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directory = None,
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config = None,
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error = Error(
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code = "key-error",
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message = f"Key error"
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)
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)
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values = [
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ConfigValue(
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type = v.type,
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key = k,
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value = self.config[v.type][k],
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)
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for k in self.config[v.type]
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]
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return ConfigResponse(
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version = self.version,
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values = values,
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directory = None,
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config = None,
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error = None,
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)
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async def handle_delete(self, v, id):
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for k in v.keys:
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if k.type not in self.config or k.key not in self.config[k.type]:
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return ConfigResponse(
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version = None,
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values = None,
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directory = None,
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config = None,
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error = Error(
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code = "key-error",
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message = f"Key error"
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)
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)
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for k in v.keys:
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del self.config[k.type][k.key]
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self.version += 1
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await self.push()
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return ConfigResponse(
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version = None,
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value = None,
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directory = None,
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values = None,
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config = None,
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error = None,
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)
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async def handle_put(self, v, id):
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for k in v.values:
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self.config[k.type][k.key] = k.value
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self.version += 1
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await self.push()
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return ConfigResponse(
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version = None,
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value = None,
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directory = None,
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values = None,
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error = None,
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)
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async def handle_config(self, v, id):
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return ConfigResponse(
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version = self.version,
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value = None,
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directory = None,
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values = None,
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config = self.config,
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error = None,
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)
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async def push(self):
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resp = ConfigPush(
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version = self.version,
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value = None,
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directory = None,
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values = None,
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config = self.config,
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error = None,
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)
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self.push_prod.send(resp)
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print("Pushed.")
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async def handle(self, msg):
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v = msg.value()
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# Sender-produced ID
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id = msg.properties()["id"]
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print(f"Handling {id}...", flush=True)
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try:
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if v.operation == "get":
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resp = await self.handle_get(v, id)
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elif v.operation == "list":
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resp = await self.handle_list(v, id)
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elif v.operation == "getvalues":
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resp = await self.handle_getvalues(v, id)
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elif v.operation == "delete":
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resp = await self.handle_delete(v, id)
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elif v.operation == "put":
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resp = await self.handle_put(v, id)
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elif v.operation == "config":
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resp = await self.handle_config(v, id)
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else:
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resp = ConfigResponse(
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value=None,
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directory=None,
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values=None,
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error=Error(
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code="bad-operation",
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message="Bad operation"
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)
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)
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await self.send(resp, properties={"id": id})
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self.consumer.acknowledge(msg)
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except Exception as e:
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resp = ConfigResponse(
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error=Error(
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type = "unexpected-error",
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message = str(e),
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),
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text=None,
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)
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await self.send(resp, properties={"id": id})
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self.consumer.acknowledge(msg)
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@staticmethod
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def add_args(parser):
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ConsumerProducer.add_args(
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parser, default_input_queue, default_subscriber,
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default_output_queue,
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)
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parser.add_argument(
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'-q', '--push-queue',
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default=default_push_queue,
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help=f'Config push queue (default: {default_push_queue})'
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)
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def run():
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Processor.launch(module, __doc__)
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