1#!/usr/bin/env python3
2
3##
4# Licensed to the Apache Software Foundation (ASF) under one
5# or more contributor license agreements.  See the NOTICE file
6# distributed with this work for additional information
7# regarding copyright ownership.  The ASF licenses this file
8# to you under the Apache License, Version 2.0 (the
9# "License"); you may not use this file except in compliance
10# with the License.  You may obtain a copy of the License at
11#
12#     https://www.apache.org/licenses/LICENSE-2.0
13#
14# Unless required by applicable law or agreed to in writing, software
15# distributed under the License is distributed on an "AS IS" BASIS,
16# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17# See the License for the specific language governing permissions and
18# limitations under the License.
19
20import http.server
21import json
22from typing import Mapping
23
24import avro.ipc
25import avro.protocol
26
27MAIL_PROTOCOL_JSON = json.dumps(
28    {
29        "namespace": "example.proto",
30        "protocol": "Mail",
31        "types": [
32            {
33                "name": "Message",
34                "type": "record",
35                "fields": [{"name": "to", "type": "string"}, {"name": "from", "type": "string"}, {"name": "body", "type": "string"}],
36            }
37        ],
38        "messages": {
39            "send": {"request": [{"name": "message", "type": "Message"}], "response": "string"},
40            "replay": {"request": [], "response": "string"},
41        },
42    }
43)
44MAIL_PROTOCOL = avro.protocol.parse(MAIL_PROTOCOL_JSON)
45SERVER_ADDRESS = ("localhost", 9090)
46
47
48class MailResponder(avro.ipc.Responder):
49    def __init__(self) -> None:
50        super().__init__(MAIL_PROTOCOL)
51
52    def invoke(self, message: avro.protocol.Message, request: Mapping[str, Mapping[str, str]]) -> str:
53        if message.name == "send":
54            return f"Sent message to {request['message']['to']} from {request['message']['from']} with body {request['message']['body']}"
55        if message.name == "replay":
56            return "replay"
57        raise RuntimeError
58
59
60class MailHandler(http.server.BaseHTTPRequestHandler):
61    def do_POST(self) -> None:
62        self.responder = MailResponder()
63        call_request_reader = avro.ipc.FramedReader(self.rfile)
64        call_request = call_request_reader.read_framed_message()
65        resp_body = self.responder.respond(call_request)
66        self.send_response(200)
67        self.send_header("Content-Type", "avro/binary")
68        self.end_headers()
69        resp_writer = avro.ipc.FramedWriter(self.wfile)
70        resp_writer.write_framed_message(resp_body)
71
72
73def main():
74    mail_server = http_server.HTTPServer(SERVER_ADDRESS, MailHandler)
75    mail_server.allow_reuse_address = True
76    mail_server.serve_forever()
77
78
79if __name__ == "__main__":
80    main()
81