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#!/usr/bin/env python3
##
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import http.server
import json
from typing import Mapping
import avro.ipc
import avro.protocol
MAIL_PROTOCOL_JSON = json.dumps(
{
"namespace": "example.proto",
"protocol": "Mail",
"types": [
{
"name": "Message",
"type": "record",
"fields": [{"name": "to", "type": "string"}, {"name": "from", "type": "string"}, {"name": "body", "type": "string"}],
}
],
"messages": {
"send": {"request": [{"name": "message", "type": "Message"}], "response": "string"},
"replay": {"request": [], "response": "string"},
},
}
)
MAIL_PROTOCOL = avro.protocol.parse(MAIL_PROTOCOL_JSON)
SERVER_ADDRESS = ("localhost", 9090)
class MailResponder(avro.ipc.Responder):
def __init__(self) -> None:
super().__init__(MAIL_PROTOCOL)
def invoke(self, message: avro.protocol.Message, request: Mapping[str, Mapping[str, str]]) -> str:
if message.name == "send":
return f"Sent message to {request['message']['to']} from {request['message']['from']} with body {request['message']['body']}"
if message.name == "replay":
return "replay"
raise RuntimeError
class MailHandler(http.server.BaseHTTPRequestHandler):
def do_POST(self) -> None:
self.responder = MailResponder()
call_request_reader = avro.ipc.FramedReader(self.rfile)
call_request = call_request_reader.read_framed_message()
resp_body = self.responder.respond(call_request)
self.send_response(200)
self.send_header("Content-Type", "avro/binary")
self.end_headers()
resp_writer = avro.ipc.FramedWriter(self.wfile)
resp_writer.write_framed_message(resp_body)
def main():
mail_server = http_server.HTTPServer(SERVER_ADDRESS, MailHandler)
mail_server.allow_reuse_address = True
mail_server.serve_forever()
if __name__ == "__main__":
main()
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