accepts AF_UNIX

Cargo.lock

@@ -639,7 +639,7 @@ dependencies = [
 
 [[package]]
 name = "markov"
-version = "0.6.3"
+version = "0.7.0"
 dependencies = [
  "async-compression",
  "cfg-if 1.0.0",

Cargo.toml

@@ -1,9 +1,10 @@
 [package]
 name = "markov"
-version = "0.6.4"
+version = "0.7.0"
 description = "Generate string of text from Markov chain fed by stdin"
 authors = ["Avril <flanchan@cumallover.me>"]
 edition = "2018"
+license = "gpl-3.0-or-later"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
@@ -16,7 +17,7 @@ compress-chain = ["async-compression"]
 # Treat each new line as a new set to feed instead of feeding the whole data at once
 split-newlines = []
 
-# Feed each sentance seperately, instead of just each line / whole body
+# Feed each sentance seperately with default /get api, instead of just each line / whole body
 # Maybe better without `split-newlines`?
 # Kinda experimental
 split-sentance = []

TODO

@@ -1,3 +0,0 @@
-Maybe see if `split-sentance` is stable enough to be enabled in prod now?
-Allow Unix domain socket for bind
-

markov.toml

@@ -2,9 +2,9 @@ bindpoint = '127.0.0.1:8001'
 file = 'chain.dat'
 max_content_length = 4194304
 max_gen_size = 256
-#save_interval_secs = 2
+save_interval_secs = 2
 trust_x_forwarded_for = false
 
 [filter]
-inbound = "<>)([]/"
-outbound = "*"
+inbound = ''
+outbound = ''

src/bind.rs

@@ -0,0 +1,171 @@
+//! For binding to sockets
+use super::*;
+use futures::{
+    prelude::*,
+};
+use std::{
+    marker::{
+	Send,
+	Unpin,
+    },
+    fmt,
+    error,
+    path::{
+	Path,
+	PathBuf,
+    },
+};
+use tokio::{
+    io::{
+	self,
+	AsyncRead,
+	AsyncWrite,
+    },
+};
+
+#[derive(Debug)]
+pub enum BindError<E>
+{
+    IO(io::Error),
+    Warp(warp::Error),
+    Other(E),
+}
+
+impl<E: error::Error + 'static> error::Error for BindError<E>
+{
+    fn source(&self) -> Option<&(dyn error::Error + 'static)> {
+	Some(match &self {
+	    Self::IO(io) => io,
+	    Self::Other(o) => o,
+	    Self::Warp(w) => w,
+	})
+    }
+}
+impl<E: fmt::Display> fmt::Display for BindError<E>
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result
+    {
+	match self {
+	    Self::IO(io) => write!(f, "io error: {}", io),
+	    Self::Other(other) => write!(f, "{}", other),
+	    Self::Warp(warp) => write!(f, "server error: {}", warp),
+	}
+    }
+}
+
+
+#[derive(Debug)]
+pub struct BindpointParseError;
+
+impl error::Error for BindpointParseError{}
+impl fmt::Display for BindpointParseError
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result
+    {
+	write!(f, "Failed to parse bindpoint as IP or unix domain socket")
+    }
+}
+
+
+#[derive(Debug, Clone, PartialEq, Eq, Hash, Serialize, Deserialize, PartialOrd)]
+pub enum Bindpoint
+{
+    Unix(PathBuf),
+    TCP(SocketAddr),
+}
+
+impl fmt::Display for Bindpoint
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result
+    {
+	match self {
+	    Self::Unix(unix) => write!(f, "unix:/{}", unix.to_string_lossy()),
+	    Self::TCP(tcp) => write!(f, "{}", tcp),
+	}
+    }
+}
+
+impl std::str::FromStr for Bindpoint
+{
+    type Err = BindpointParseError;
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+	Ok(if let Ok(ip) = s.parse::<SocketAddr>() {
+	    Self::TCP(ip)
+	} else if s.starts_with("unix:/") {
+	    Self::Unix(PathBuf::from(&s[6..].to_owned()))
+	} else {
+	    return Err(BindpointParseError);  
+	})
+    }
+}
+
+fn bind_unix(to: impl AsRef<Path>) -> io::Result<impl TryStream<Ok= impl AsyncRead + AsyncWrite + Send + Unpin + 'static + Send, Error = impl Into<Box<dyn std::error::Error + Send + Sync>>>>
+{
+    debug!("Binding to AF_UNIX: {:?}", to.as_ref());
+    let listener = tokio::net::UnixListener::bind(to)?;
+    Ok(listener)
+}
+
+pub fn serve<F>(server: warp::Server<F>, bind: Bindpoint, signal: impl Future<Output=()> + Send + 'static) -> Result<(Bindpoint, BoxFuture<'static, ()>), BindError<std::convert::Infallible>>
+where F: Filter + Clone + Send + Sync + 'static,
+<F::Future as TryFuture>::Ok: warp::Reply,
+{
+    Ok(match bind {
+	Bindpoint::TCP(sock) => server.try_bind_with_graceful_shutdown(sock, signal).map(|(sock, fut)| (Bindpoint::TCP(sock), fut.boxed())).map_err(BindError::Warp)?,
+	Bindpoint::Unix(unix) => {
+	    (Bindpoint::Unix(unix.clone()),
+	     server.serve_incoming_with_graceful_shutdown(bind_unix(unix).map_err(BindError::IO)?, signal).boxed())
+	},
+    })
+}
+
+impl From<SocketAddr> for Bindpoint
+{
+    fn from(from: SocketAddr) -> Self
+    {
+	Self::TCP(from)
+    }
+}
+
+pub fn try_serve<F>(server: warp::Server<F>, bind: impl TryBindpoint, signal: impl Future<Output=()> + Send + 'static) -> Result<(Bindpoint, BoxFuture<'static, ()>), BindError<impl error::Error + 'static>>
+where F: Filter + Clone + Send + Sync + 'static,
+<F::Future as TryFuture>::Ok: warp::Reply,
+{
+    serve(server, bind.try_parse().map_err(BindError::Other)?, signal).map_err(BindError::coerce)
+}
+
+pub trait TryBindpoint: Sized
+{
+    type Err: error::Error + 'static;
+    fn try_parse(self) -> Result<Bindpoint, Self::Err>;
+}
+
+impl TryBindpoint for Bindpoint
+{
+    type Err = std::convert::Infallible;
+    fn try_parse(self) -> Result<Bindpoint, Self::Err>
+    {
+	Ok(self)
+    }
+}
+
+impl<T: AsRef<str>> TryBindpoint for T
+{
+    type Err = BindpointParseError;
+    fn try_parse(self) -> Result<Bindpoint, Self::Err>
+    {
+	self.as_ref().parse()
+    }
+}
+
+impl BindError<std::convert::Infallible>
+{
+    pub fn coerce<T>(self) -> BindError<T>
+    {
+	match self {
+	    Self::Warp(w) => BindError::Warp(w),
+	    Self::IO(w) => BindError::IO(w),
+	    #[cold] _ => unreachable!(),
+	}
+    }
+}

src/config.rs

@@ -19,7 +19,7 @@ pub const DEFAULT_FILE_LOCATION: &'static str = "markov.toml";
 #[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Hash, Serialize, Deserialize)]
 pub struct Config
 {
-    pub bindpoint: SocketAddr,
+    pub bindpoint: String,
     pub file: String,
     pub max_content_length: u64,
     pub max_gen_size: usize,
@@ -65,7 +65,7 @@ impl Default for Config
     fn default() -> Self
     {
 	Self {
-	    bindpoint: ([127,0,0,1], 8001).into(),
+	    bindpoint: SocketAddr::from(([127,0,0,1], 8001)).to_string(),
 	    file: "chain.dat".to_owned(),
 	    max_content_length: 1024 * 1024 * 4,
 	    max_gen_size: 256,

src/ext.rs

@@ -1,7 +1,14 @@
 //! Extensions
 use std::{
     iter,
-    ops::Range,
+    ops::{
+	Range,
+	Deref,DerefMut,
+    },
+    marker::{
+	PhantomData,
+	Send,
+    },
 };
 
 pub trait StringJoinExt: Sized
@@ -94,3 +101,52 @@ impl TrimInPlace for String
 	self
     }
 }
+
+pub trait MapTuple2<T,U>
+{
+    fn map<V,W, F: FnOnce((T,U)) -> (V,W)>(self, fun: F) -> (V,W);
+}
+
+impl<T,U> MapTuple2<T,U> for (T,U)
+{
+    #[inline] fn map<V,W, F: FnOnce((T,U)) -> (V,W)>(self, fun: F) -> (V,W)
+    {
+	fun(self)
+    }
+}
+
+/// To make sure we don't keep this data across an `await` boundary.
+#[repr(transparent)]
+pub struct AssertNotSend<T>(pub T, PhantomData<*const T>);
+
+impl<T> AssertNotSend<T>
+{
+    pub const fn new(from :T) -> Self
+    {
+	Self(from, PhantomData)
+    }
+    pub fn into_inner(self) -> T
+    {
+	self.0
+    }
+}
+
+/// Require a future is Send
+#[inline(always)] pub fn require_send<T: Send>(t: T) -> T
+{
+    t
+}
+
+impl<T> Deref for AssertNotSend<T>
+{
+    type Target = T;
+    fn deref(&self) -> &Self::Target {
+	&self.0
+    }
+}
+impl<T> DerefMut for AssertNotSend<T>
+{
+    fn deref_mut(&mut self) -> &mut Self::Target {
+	&mut self.0
+    }
+}

src/main.rs

@@ -81,10 +81,29 @@ mod feed;
 mod gen;
 mod sentance;
 
-#[tokio::main]
-async fn main() {
+const DEFAULT_LOG_LEVEL: &str = "warn";
+
+fn init_log()
+{
+    let level = match std::env::var_os("RUST_LOG") {
+	None => {
+	    std::env::set_var("RUST_LOG", DEFAULT_LOG_LEVEL);
+	    std::borrow::Cow::Borrowed(std::ffi::OsStr::new(DEFAULT_LOG_LEVEL))
+	},
+	Some(w) => std::borrow::Cow::Owned(w),
+    };
     pretty_env_logger::init();
+    trace!("Initialising `genmarkov` ({}) v{} with log level {:?}.\n\tMade by {} with <3.\n\tLicensed with GPL v3 or later",
+	   std::env::args().next().unwrap(),
+	   env!("CARGO_PKG_VERSION"),
+	   level,
+	   env!("CARGO_PKG_AUTHORS"));
+}
 
+#[tokio::main]
+async fn main() {
+    init_log();
+    
     let config = match config::load().await {
 	Some(v) => v,
 	_ => {
@@ -237,14 +256,29 @@ async fn main() {
 	#[cfg(target_family="unix")]
 	tasks.push(tokio::spawn(signals::handle(state.clone())).map(|res| res.expect("Signal handler panicked")).boxed());
 
-	let (addr, server) = warp::serve(push
-					 .or(read))
-	    .bind_with_graceful_shutdown(state.config().bindpoint, async move {
-		tokio::signal::ctrl_c().await.unwrap();
-		state.shutdown();
-	    });
-	info!("Server bound on {:?}", addr);
-	server.await;
+	require_send(async {
+	    let server = {
+		let s2 = AssertNotSend::new(state.clone()); //temp clone the Arcs here for shutdown if server fails to bind, assert they cannot remain cloned across an await boundary.
+		match bind::try_serve(warp::serve(push
+						  .or(read)),
+				      state.config().bindpoint.clone(),
+				      async move {
+					  tokio::signal::ctrl_c().await.unwrap();
+					  state.shutdown();
+				      }) {
+		    Ok((addr, server)) => {
+			info!("Server bound on {:?}", addr);
+			server
+		    },
+		    Err(err) => {
+			error!("Failed to bind server: {}", err);
+			s2.into_inner().shutdown();
+			return;
+		    },
+		}
+	    };
+	    server.await;
+	}).await;
 	
 	// Cleanup
 	async move {
@@ -255,3 +289,5 @@ async fn main() {
     }.await;
     info!("Shut down gracefully")
 }
+
+mod bind;