1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162

use std::io::{self, Cursor};

use fbthrift::{
    binary_protocol::BinaryProtocolDeserializer, ApplicationException, Deserialize, MessageType,
    ProtocolReader,
};
use fbthrift_transport_response_handler::ResponseHandler;
use nebula_fbthrift_meta::services::meta_service::{
    GetSpaceExn, ListEdgesExn, ListPartsExn, ListSpacesExn, ListTagsExn,
};

#[derive(Clone)]
pub struct MetaTransportResponseHandler;

impl ResponseHandler for MetaTransportResponseHandler {
    fn try_make_static_response_bytes(
        &mut self,
        _service_name: &'static str,
        fn_name: &'static str,
        _request_bytes: &[u8],
    ) -> io::Result<Option<Vec<u8>>> {
        match fn_name {
            "MetaService.listSpaces"
            | "MetaService.getSpace"
            | "MetaService.listParts"
            | "MetaService.listTags"
            | "MetaService.listEdges" => Ok(None),
            _ => Err(io::Error::new(
                io::ErrorKind::Other,
                format!("Unknown method {}", fn_name),
            )),
        }
    }

    fn parse_response_bytes(&mut self, response_bytes: &[u8]) -> io::Result<Option<usize>> {
        let mut des = BinaryProtocolDeserializer::new(Cursor::new(response_bytes));
        let (name, message_type, _) = match des.read_message_begin(|v| v.to_vec()) {
            Ok(v) => v,
            Err(_) => return Ok(None),
        };

        match &name[..] {
            b"listSpaces" | b"getSpace" | b"listParts" | b"listTags" | b"listEdges" => {}
            _ => return Ok(None),
        };

        match message_type {
            MessageType::Reply => {
                match &name[..] {
                    b"listSpaces" => {
                        let _: ListSpacesExn = match Deserialize::read(&mut des) {
                            Ok(v) => v,
                            Err(_) => return Ok(None),
                        };
                    }
                    b"getSpace" => {
                        let _: GetSpaceExn = match Deserialize::read(&mut des) {
                            Ok(v) => v,
                            Err(_) => return Ok(None),
                        };
                    }
                    b"listParts" => {
                        let _: ListPartsExn = match Deserialize::read(&mut des) {
                            Ok(v) => v,
                            Err(_) => return Ok(None),
                        };
                    }
                    b"listTags" => {
                        let _: ListTagsExn = match Deserialize::read(&mut des) {
                            Ok(v) => v,
                            Err(_) => return Ok(None),
                        };
                    }
                    b"listEdges" => {
                        let _: ListEdgesExn = match Deserialize::read(&mut des) {
                            Ok(v) => v,
                            Err(_) => return Ok(None),
                        };
                    }
                    _ => unreachable!(),
                };
            }
            MessageType::Exception => {
                let _: ApplicationException = match Deserialize::read(&mut des) {
                    Ok(v) => v,
                    Err(_) => return Ok(None),
                };
            }
            MessageType::Call | MessageType::Oneway | MessageType::InvalidMessageType => {}
        }

        match des.read_message_end() {
            Ok(v) => v,
            Err(_) => return Ok(None),
        };

        Ok(Some(des.into_inner().position() as usize))
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    use std::error;

    #[test]
    fn test_try_make_static_response_bytes() -> Result<(), Box<dyn error::Error>> {
        let mut handler = MetaTransportResponseHandler;

        assert_eq!(
            handler.try_make_static_response_bytes(
                "MetaService",
                "MetaService.listSpaces",
                b"FOO"
            )?,
            None
        );
        assert_eq!(
            handler.try_make_static_response_bytes(
                "MetaService",
                "MetaService.getSpace",
                b"FOO"
            )?,
            None
        );
        assert_eq!(
            handler.try_make_static_response_bytes(
                "MetaService",
                "MetaService.listParts",
                b"FOO"
            )?,
            None
        );
        assert_eq!(
            handler.try_make_static_response_bytes(
                "MetaService",
                "MetaService.listTags",
                b"FOO"
            )?,
            None
        );
        assert_eq!(
            handler.try_make_static_response_bytes(
                "MetaService",
                "MetaService.listEdges",
                b"FOO"
            )?,
            None
        );
        match handler.try_make_static_response_bytes("MetaService", "MetaService.foo", b"FOO") {
            Ok(_) => assert!(false),
            Err(err) => {
                assert_eq!(err.kind(), io::ErrorKind::Other);

                assert_eq!(err.to_string(), "Unknown method MetaService.foo");
            }
        }

        Ok(())
    }
}