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| 1 | +use futures::{try_ready, Async, Future, Poll}; |
| 2 | +use futures_cpupool::{CpuFuture, CpuPool}; |
| 3 | +use lazy_static::lazy_static; |
| 4 | +use state_machine_future::{transition, RentToOwn, StateMachineFuture}; |
| 5 | +use std::collections::HashMap; |
| 6 | +use std::io; |
| 7 | +use std::net::{SocketAddr, ToSocketAddrs}; |
| 8 | +#[cfg(unix)] |
| 9 | +use std::path::Path; |
| 10 | +use std::vec; |
| 11 | +use tokio_tcp::TcpStream; |
| 12 | +#[cfg(unix)] |
| 13 | +use tokio_uds::UnixStream; |
| 14 | + |
| 15 | +use crate::proto::{Client, Connection, HandshakeFuture}; |
| 16 | +use crate::{Error, Socket, TlsMode}; |
| 17 | + |
| 18 | +lazy_static! { |
| 19 | + static ref DNS_POOL: CpuPool = futures_cpupool::Builder::new() |
| 20 | + .name_prefix("postgres-dns-") |
| 21 | + .pool_size(2) |
| 22 | + .create(); |
| 23 | +} |
| 24 | + |
| 25 | +#[derive(StateMachineFuture)] |
| 26 | +pub enum Connect<T> |
| 27 | +where |
| 28 | + T: TlsMode<Socket>, |
| 29 | +{ |
| 30 | + #[state_machine_future(start)] |
| 31 | + #[cfg_attr(unix, state_machine_future(transitions(ConnectingUnix, ResolvingDns)))] |
| 32 | + #[cfg_attr(not(unix), state_machine_future(transitions(ConnectingTcp)))] |
| 33 | + Start { |
| 34 | + tls_mode: T, |
| 35 | + params: HashMap<String, String>, |
| 36 | + }, |
| 37 | + #[cfg(unix)] |
| 38 | + #[state_machine_future(transitions(Handshaking))] |
| 39 | + ConnectingUnix { |
| 40 | + future: tokio_uds::ConnectFuture, |
| 41 | + tls_mode: T, |
| 42 | + params: HashMap<String, String>, |
| 43 | + }, |
| 44 | + #[state_machine_future(transitions(ConnectingTcp))] |
| 45 | + ResolvingDns { |
| 46 | + future: CpuFuture<vec::IntoIter<SocketAddr>, io::Error>, |
| 47 | + tls_mode: T, |
| 48 | + params: HashMap<String, String>, |
| 49 | + }, |
| 50 | + #[state_machine_future(transitions(Handshaking))] |
| 51 | + ConnectingTcp { |
| 52 | + future: tokio_tcp::ConnectFuture, |
| 53 | + addrs: vec::IntoIter<SocketAddr>, |
| 54 | + tls_mode: T, |
| 55 | + params: HashMap<String, String>, |
| 56 | + }, |
| 57 | + #[state_machine_future(transitions(Finished))] |
| 58 | + Handshaking { future: HandshakeFuture<Socket, T> }, |
| 59 | + #[state_machine_future(ready)] |
| 60 | + Finished((Client, Connection<T::Stream>)), |
| 61 | + #[state_machine_future(error)] |
| 62 | + Failed(Error), |
| 63 | +} |
| 64 | + |
| 65 | +impl<T> PollConnect<T> for Connect<T> |
| 66 | +where |
| 67 | + T: TlsMode<Socket>, |
| 68 | +{ |
| 69 | + fn poll_start<'a>(state: &'a mut RentToOwn<'a, Start<T>>) -> Poll<AfterStart<T>, Error> { |
| 70 | + let mut state = state.take(); |
| 71 | + |
| 72 | + let host = match state.params.remove("host") { |
| 73 | + Some(host) => host, |
| 74 | + None => return Err(Error::missing_host()), |
| 75 | + }; |
| 76 | + |
| 77 | + let port = match state.params.remove("port") { |
| 78 | + Some(port) => port.parse::<u16>().map_err(Error::invalid_port)?, |
| 79 | + None => 5432, |
| 80 | + }; |
| 81 | + |
| 82 | + #[cfg(unix)] |
| 83 | + { |
| 84 | + if host.starts_with('/') { |
| 85 | + let path = Path::new(&host).join(format!(".s.PGSQL.{}", port)); |
| 86 | + transition!(ConnectingUnix { |
| 87 | + future: UnixStream::connect(path), |
| 88 | + tls_mode: state.tls_mode, |
| 89 | + params: state.params, |
| 90 | + }) |
| 91 | + } |
| 92 | + } |
| 93 | + |
| 94 | + transition!(ResolvingDns { |
| 95 | + future: DNS_POOL.spawn_fn(move || (&*host, port).to_socket_addrs()), |
| 96 | + tls_mode: state.tls_mode, |
| 97 | + params: state.params, |
| 98 | + }) |
| 99 | + } |
| 100 | + |
| 101 | + #[cfg(unix)] |
| 102 | + fn poll_connecting_unix<'a>( |
| 103 | + state: &'a mut RentToOwn<'a, ConnectingUnix<T>>, |
| 104 | + ) -> Poll<AfterConnectingUnix<T>, Error> { |
| 105 | + let stream = try_ready!(state.future.poll().map_err(Error::connect)); |
| 106 | + let stream = Socket::new_unix(stream); |
| 107 | + let state = state.take(); |
| 108 | + |
| 109 | + transition!(Handshaking { |
| 110 | + future: HandshakeFuture::new(stream, state.tls_mode, state.params) |
| 111 | + }) |
| 112 | + } |
| 113 | + |
| 114 | + fn poll_resolving_dns<'a>( |
| 115 | + state: &'a mut RentToOwn<'a, ResolvingDns<T>>, |
| 116 | + ) -> Poll<AfterResolvingDns<T>, Error> { |
| 117 | + let mut addrs = try_ready!(state.future.poll().map_err(Error::connect)); |
| 118 | + let state = state.take(); |
| 119 | + |
| 120 | + let addr = match addrs.next() { |
| 121 | + Some(addr) => addr, |
| 122 | + None => { |
| 123 | + return Err(Error::connect(io::Error::new( |
| 124 | + io::ErrorKind::InvalidData, |
| 125 | + "resolved 0 addresses", |
| 126 | + ))) |
| 127 | + } |
| 128 | + }; |
| 129 | + |
| 130 | + transition!(ConnectingTcp { |
| 131 | + future: TcpStream::connect(&addr), |
| 132 | + addrs, |
| 133 | + tls_mode: state.tls_mode, |
| 134 | + params: state.params, |
| 135 | + }) |
| 136 | + } |
| 137 | + |
| 138 | + fn poll_connecting_tcp<'a>( |
| 139 | + state: &'a mut RentToOwn<'a, ConnectingTcp<T>>, |
| 140 | + ) -> Poll<AfterConnectingTcp<T>, Error> { |
| 141 | + let stream = loop { |
| 142 | + match state.future.poll() { |
| 143 | + Ok(Async::Ready(stream)) => break Socket::new_tcp(stream), |
| 144 | + Ok(Async::NotReady) => return Ok(Async::NotReady), |
| 145 | + Err(e) => { |
| 146 | + let addr = match state.addrs.next() { |
| 147 | + Some(addr) => addr, |
| 148 | + None => return Err(Error::connect(e)), |
| 149 | + }; |
| 150 | + state.future = TcpStream::connect(&addr); |
| 151 | + } |
| 152 | + } |
| 153 | + }; |
| 154 | + let state = state.take(); |
| 155 | + |
| 156 | + transition!(Handshaking { |
| 157 | + future: HandshakeFuture::new(stream, state.tls_mode, state.params), |
| 158 | + }) |
| 159 | + } |
| 160 | + |
| 161 | + fn poll_handshaking<'a>( |
| 162 | + state: &'a mut RentToOwn<'a, Handshaking<T>>, |
| 163 | + ) -> Poll<AfterHandshaking<T>, Error> { |
| 164 | + let r = try_ready!(state.future.poll()); |
| 165 | + |
| 166 | + transition!(Finished(r)) |
| 167 | + } |
| 168 | +} |
| 169 | + |
| 170 | +impl<T> ConnectFuture<T> |
| 171 | +where |
| 172 | + T: TlsMode<Socket>, |
| 173 | +{ |
| 174 | + pub fn new(tls_mode: T, params: HashMap<String, String>) -> ConnectFuture<T> { |
| 175 | + Connect::start(tls_mode, params) |
| 176 | + } |
| 177 | +} |
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