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

use r2d2::{Builder, ManageConnection};
use std::cell::RefCell;
use std::io;
use std::io::Write;
use std::net::ToSocketAddrs;

use crate::authenticators::Authenticator;
use crate::cluster::ConnectionPool;
use crate::cluster::NodeTcpConfig;
use crate::compression::Compression;
use crate::error;
use crate::frame::parser::parse_frame;
use crate::frame::{Frame, IntoBytes, Opcode};
use crate::transport::{CDRSTransport, TransportTcp};

/// Shortcut for `r2d2::Pool` type of TCP-based CDRS connections.
pub type TcpConnectionPool<A> = ConnectionPool<TcpConnectionsManager<A>>;

/// `r2d2::Pool` of TCP-based CDRS connections.
///
/// Used internally for TCP Session for holding connections to a specific Cassandra node.
pub fn new_tcp_pool<'a, A: Authenticator + Send + Sync + 'static>(
    node_config: NodeTcpConfig<'a, A>,
) -> error::Result<TcpConnectionPool<A>> {
    let manager =
        TcpConnectionsManager::new(node_config.addr.to_string(), node_config.authenticator);

    let pool = Builder::new()
        .max_size(node_config.max_size)
        .min_idle(node_config.min_idle)
        .max_lifetime(node_config.max_lifetime)
        .idle_timeout(node_config.idle_timeout)
        .connection_timeout(node_config.connection_timeout)
        .build(manager)
        .map_err(|err| error::Error::from(err.to_string()))?;

    let addr = node_config
        .addr
        .to_socket_addrs()?
        .next()
        .ok_or_else(|| error::Error::from("Cannot parse address"))?;

    Ok(TcpConnectionPool::new(pool, addr))
}

/// `r2d2` connection manager.
pub struct TcpConnectionsManager<A> {
    addr: String,
    auth: A,
}

impl<A> TcpConnectionsManager<A> {
    pub fn new<S: ToString>(addr: S, auth: A) -> Self {
        TcpConnectionsManager {
            addr: addr.to_string(),
            auth,
        }
    }
}

impl<A: Authenticator + 'static + Send + Sync> ManageConnection for TcpConnectionsManager<A> {
    type Connection = RefCell<TransportTcp>;
    type Error = error::Error;

    fn connect(&self) -> Result<Self::Connection, Self::Error> {
        let transport = RefCell::new(TransportTcp::new(&self.addr)?);
        startup(&transport, &self.auth)?;

        Ok(transport)
    }

    fn is_valid(&self, conn: &mut Self::Connection) -> Result<(), Self::Error> {
        let options_frame = Frame::new_req_options().into_cbytes();
        conn.borrow_mut().write(options_frame.as_slice())?;

        parse_frame(conn, &Compression::None {}).map(|_| ())
    }

    fn has_broken(&self, conn: &mut Self::Connection) -> bool {
        !conn.borrow().is_alive()
    }
}

pub fn startup<'b, T: CDRSTransport + 'static, A: Authenticator + 'static + Sized>(
    transport: &RefCell<T>,
    session_authenticator: &'b A,
) -> error::Result<()> {
    let ref mut compression = Compression::None;
    let startup_frame = Frame::new_req_startup(compression.as_str()).into_cbytes();

    transport.borrow_mut().write(startup_frame.as_slice())?;

    let start_response = parse_frame(transport, compression)?;

    if start_response.opcode == Opcode::Ready {
        return Ok(());
    }

    if start_response.opcode == Opcode::Authenticate {
        let body = start_response.get_body()?;
        let authenticator = body.get_authenticator().expect(
            "Cassandra Server did communicate that it neededs
                authentication but the auth schema was missing in the body response",
        );

        // This creates a new scope; avoiding a clone
        // and we check whether
        // 1. any authenticators has been passed in by client and if not send error back
        // 2. authenticator is provided by the client and `auth_scheme` presented by
        //      the server and client are same if not send error back
        // 3. if it falls through it means the preliminary conditions are true

        let auth_check = session_authenticator
            .get_cassandra_name()
            .ok_or(error::Error::General(
                "No authenticator was provided".to_string(),
            ))
            .map(|auth| {
                if authenticator != auth {
                    let io_err = io::Error::new(
                        io::ErrorKind::NotFound,
                        format!(
                            "Unsupported type of authenticator. {:?} got,
                             but {} is supported.",
                            authenticator, auth
                        ),
                    );
                    return Err(error::Error::Io(io_err));
                }
                Ok(())
            });

        if let Err(err) = auth_check {
            return Err(err);
        }

        let auth_token_bytes = session_authenticator.get_auth_token();
        transport.borrow_mut().write(
            Frame::new_req_auth_response(auth_token_bytes)
                .into_cbytes()
                .as_slice(),
        )?;
        parse_frame(transport, compression)?;

        return Ok(());
    }

    unreachable!();
}