gremlin-client 0.2.0

A Rust client for Apache TinkerPop™
Documentation 
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

use crate::{GremlinError, GremlinResult};
use std::net::TcpStream;
use websocket::{sync::Client, ClientBuilder, OwnedMessage};

enum ConnectionStream {
    TCP(Client<TcpStream>),
    #[allow(dead_code)]
    SSL,
}

impl std::fmt::Debug for ConnectionStream {
    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
        write!(f, "Connection")
    }
}

impl ConnectionStream {
    fn connect(options: ConnectionOptions) -> GremlinResult<Self> {
        let address = format!("ws://{}:{}/gremlin", options.host, options.port);

        let client = ClientBuilder::new(&address)
            .map_err(|e| GremlinError::Generic(e.to_string()))?
            .connect_insecure()?;

        Ok(ConnectionStream::TCP(client))
    }

    fn send(&mut self, payload: Vec<u8>) -> GremlinResult<()> {
        match self {
            ConnectionStream::TCP(s) => s
                .send_message(&OwnedMessage::Binary(payload))
                .map_err(GremlinError::from),
            ConnectionStream::SSL => unimplemented!(),
        }
    }

    fn recv(&mut self) -> GremlinResult<Vec<u8>> {
        let message = match self {
            ConnectionStream::TCP(s) => s.recv_message()?,
            ConnectionStream::SSL => unimplemented!(),
        };

        match message {
            OwnedMessage::Binary(binary) => Ok(binary),
            _ => unimplemented!(),
        }
    }
}

#[derive(Debug)]
pub(crate) struct Connection {
    stream: ConnectionStream,
}

impl Into<ConnectionOptions> for (&str, u16) {
    fn into(self) -> ConnectionOptions {
        ConnectionOptions {
            host: String::from(self.0),
            port: self.1,
            ..Default::default()
        }
    }
}

impl Into<ConnectionOptions> for &str {
    fn into(self) -> ConnectionOptions {
        ConnectionOptions {
            host: String::from(self),
            ..Default::default()
        }
    }
}

pub struct ConnectionOptionsBuilder(ConnectionOptions);

impl ConnectionOptionsBuilder {
    pub fn host<T>(mut self, host: T) -> Self
    where
        T: Into<String>,
    {
        self.0.host = host.into();
        self
    }

    pub fn port(mut self, port: u16) -> Self {
        self.0.port = port;
        self
    }

    pub fn pool_size(mut self, pool_size: u32) -> Self {
        self.0.pool_size = pool_size;
        self
    }

    pub fn build(self) -> ConnectionOptions {
        self.0
    }
}

#[derive(Clone, Debug)]
pub struct ConnectionOptions {
    pub(crate) host: String,
    pub(crate) port: u16,
    pub(crate) pool_size: u32,
}

impl Default for ConnectionOptions {
    fn default() -> ConnectionOptions {
        ConnectionOptions {
            host: String::from("localhost"),
            port: 8182,
            pool_size: 10,
        }
    }
}

impl ConnectionOptions {
    pub fn builder() -> ConnectionOptionsBuilder {
        ConnectionOptionsBuilder(ConnectionOptions::default())
    }
}

impl Connection {
    pub fn connect<T>(options: T) -> GremlinResult<Connection>
    where
        T: Into<ConnectionOptions>,
    {
        Ok(Connection {
            stream: ConnectionStream::connect(options.into())?,
        })
    }

    pub fn send(&mut self, payload: Vec<u8>) -> GremlinResult<()> {
        self.stream.send(payload)
    }

    pub fn recv(&mut self) -> GremlinResult<Vec<u8>> {
        self.stream.recv()
    }
}

#[cfg(test)]
mod tests {

    use super::Connection;

    #[test]
    fn it_should_connect() {
        Connection::connect(("localhost", 8182)).unwrap();
    }
}