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|
use futures::future::Future as _;
use futures::stream::Stream as _;
use snafu::ResultExt as _;
use std::io::Write as _;
#[derive(Debug, snafu::Snafu)]
pub enum Error {
#[snafu(display("failed to connect: {}", source))]
Connect { source: std::io::Error },
#[snafu(display("failed to read message: {}", source))]
Read { source: crate::protocol::Error },
#[snafu(display("failed to write message: {}", source))]
Write { source: crate::protocol::Error },
#[snafu(display("failed to write to terminal: {}", source))]
WriteTerminal { source: std::io::Error },
#[snafu(display("communication with server failed: {}", source))]
Client { source: crate::client::Error },
#[snafu(display(
"failed to read message: unexpected message received: {:?}",
message
))]
UnexpectedMessage { message: crate::protocol::Message },
}
pub type Result<T> = std::result::Result<T, Error>;
pub fn cmd<'a, 'b>(app: clap::App<'a, 'b>) -> clap::App<'a, 'b> {
app.about("Watch shellshare streams")
.arg(
clap::Arg::with_name("address")
.long("address")
.takes_value(true),
)
.arg(clap::Arg::with_name("id"))
}
pub fn run<'a>(matches: &clap::ArgMatches<'a>) -> super::Result<()> {
run_impl(
matches.value_of("address").unwrap_or("127.0.0.1:4144"),
matches.value_of("id"),
)
.context(super::Watch)
}
fn run_impl(address: &str, id: Option<&str>) -> Result<()> {
if let Some(id) = id {
watch(address, id)
} else {
list(address)
}
}
fn list(address: &str) -> Result<()> {
let sock = std::net::TcpStream::connect(address).context(Connect)?;
let term = std::env::var("TERM").unwrap_or_else(|_| "".to_string());
let size = crossterm::terminal().terminal_size();
let msg = crate::protocol::Message::login(
"doy",
&term,
(u32::from(size.0), u32::from(size.1)),
);
msg.write(&sock).context(Write)?;
let msg = crate::protocol::Message::list_sessions();
msg.write(&sock).context(Write)?;
let res = crate::protocol::Message::read(&sock).context(Read)?;
match res {
crate::protocol::Message::Sessions { sessions } => {
println!("available sessions:");
for session in sessions {
println!(
"{}: {}, {}x{}, TERM={}",
session.id,
session.username,
session.size.0,
session.size.1,
session.term_type
);
}
}
crate::protocol::Message::Error { msg } => {
eprintln!("server error: {}", msg);
}
_ => {
return Err(Error::UnexpectedMessage { message: res });
}
}
Ok(())
}
fn watch(address: &str, id: &str) -> Result<()> {
tokio::run(
WatchSession::new(
id,
address,
"doy",
std::time::Duration::from_secs(5),
)?
.map_err(|e| {
eprintln!("{}", e);
}),
);
Ok(())
}
struct WatchSession {
client: crate::client::Client,
}
impl WatchSession {
fn new(
id: &str,
address: &str,
username: &str,
heartbeat_duration: std::time::Duration,
) -> Result<Self> {
let client = crate::client::Client::watch(
address,
username,
heartbeat_duration,
id,
);
Ok(Self { client })
}
}
impl WatchSession {
const POLL_FNS: &'static [&'static dyn for<'a> Fn(
&'a mut Self,
) -> Result<
crate::component_future::Poll<()>,
>] = &[&Self::poll_read_client];
fn poll_read_client(
&mut self,
) -> Result<crate::component_future::Poll<()>> {
match self.client.poll().context(Client)? {
futures::Async::Ready(Some(e)) => match e {
crate::client::Event::Reconnect => {
Ok(crate::component_future::Poll::DidWork)
}
crate::client::Event::ServerMessage(msg) => match msg {
crate::protocol::Message::TerminalOutput { data } => {
// TODO async
let stderr = std::io::stderr();
let mut stderr = stderr.lock();
stderr.write(&data).context(WriteTerminal)?;
Ok(crate::component_future::Poll::DidWork)
}
crate::protocol::Message::Disconnected => {
Ok(crate::component_future::Poll::Event(()))
}
crate::protocol::Message::Error { msg } => {
eprintln!("server error: {}", msg);
Ok(crate::component_future::Poll::Event(()))
}
msg => Err(Error::UnexpectedMessage { message: msg }),
},
},
futures::Async::Ready(None) => {
// the client should never exit on its own
unreachable!()
}
futures::Async::NotReady => {
Ok(crate::component_future::Poll::NotReady)
}
}
}
}
#[must_use = "futures do nothing unless polled"]
impl futures::future::Future for WatchSession {
type Item = ();
type Error = Error;
fn poll(&mut self) -> futures::Poll<Self::Item, Self::Error> {
crate::component_future::poll_future(self, Self::POLL_FNS)
}
}
|
