Windows eventloop draft

src/io/abstract/address.rs

@@ -1,4 +1,6 @@
-pub trait Address: Sized {
+use std::hash::Hash;
+
+pub trait Address: Sized + PartialEq + Hash {
     fn parse(raw: &str) -> Result<Self, String>;
 
     fn to_string(self) -> String;

src/io/abstract/mod.rs

@@ -1,3 +1,4 @@
 mod address;
+mod context;
 
 pub use address::Address;

src/io/allocator.rs

@@ -3,7 +3,7 @@ use std::mem::uninitialized;
 use std::pin::Pin;
 use std::ptr;
 
-pub struct Allocator<T> {
+pub(super) struct Allocator<T> {
     map: HashMap<usize, Pin<Box<T>>>,
 }
 
@@ -24,4 +24,7 @@ impl<T> Allocator<T> {
             .unwrap_or_else(|| unreachable!())
             .as_mut();
     }
+
+    pub unsafe fn free(&mut self, p: Pin<&mut T>) {
+    }
 }

src/io/mod.rs

@@ -1,3 +1,7 @@
-mod windows;
-mod allocator;
 pub mod r#abstract;
+mod allocator;
+mod windows;
+mod servers_context;
+
+pub type Address = windows::WindowsAddressKnown;
+use allocator::Allocator;

src/io/servers_context.rs

@@ -0,0 +1,7 @@
+use super::Address;
+
+pub trait ServersContext {
+    fn iter_servers(&self) -> impl Iterator<Item=Address>;
+
+    fn report_ping(&mut self, addr: Address, ping_ms: u64);
+}

src/io/windows/address.rs

@@ -1,19 +1,24 @@
 use crate::io::r#abstract::Address;
 use crate::io::windows::errors::{format_windows_err_code_result, throw_from_windows_err_code};
 use std::ffi::OsString;
+use std::hash::{Hash, Hasher};
 use std::mem::size_of;
 use std::mem::zeroed;
 use std::os::windows::ffi::OsStringExt;
-use std::ptr::{copy_nonoverlapping, null, null_mut};
 use std::ptr;
+use std::ptr::{copy_nonoverlapping, null, null_mut};
+use windows::Win32::Networking::WinSock::{
+    ADDRINFOW, AF_INET, AF_INET6, AF_UNSPEC, FreeAddrInfoW, GetAddrInfoW, SOCKADDR_IN,
+    SOCKADDR_IN6, SOCKADDR_STORAGE, WSAAddressToStringW, WSAGetLastError,
+};
 use windows::core::{PCWSTR, PWSTR};
-use windows::Win32::Networking::WinSock::{FreeAddrInfoW, GetAddrInfoW, WSAAddressToStringW, WSAGetLastError, ADDRINFOW, AF_INET, AF_INET6, SOCKADDR_IN, SOCKADDR_IN6, SOCKADDR_STORAGE};
 
-pub struct WindowsAddress {
-    native: SOCKADDR_STORAGE,
+#[derive(Clone, Copy)]
+pub struct WindowsAddressAny {
+    pub(super) native: SOCKADDR_STORAGE,
 }
 
-impl Address for WindowsAddress {
+impl Address for WindowsAddressAny {
     fn parse(raw: &str) -> Result<Self, String> {
         let encoded = raw.encode_utf16().collect::<Vec<_>>();
         unsafe {
@@ -58,7 +63,7 @@ impl Address for WindowsAddress {
     }
 }
 
-impl PartialEq for WindowsAddress {
+impl PartialEq for WindowsAddressAny {
     fn eq(&self, other: &Self) -> bool {
         match self.native.ss_family {
             AF_INET => {
@@ -75,8 +80,63 @@ impl PartialEq for WindowsAddress {
                 let self_6 = *ptr::from_ref(&self.native).cast::<SOCKADDR_IN6>();
                 let other_6 = *ptr::from_ref(&other.native).cast::<SOCKADDR_IN6>();
                 return self_6.sin6_addr.u.Word == other_6.sin6_addr.u.Word;
-            }
+            },
             _ => return false,
         }
     }
 }
+
+impl Hash for WindowsAddressAny {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        match self.native.ss_family {
+            AF_INET => {
+                state.write_u16(self.native.ss_family.0);
+                unsafe {
+                    let self_4 = *ptr::from_ref(&self.native).cast::<SOCKADDR_IN>();
+                    state.write_u32(self_4.sin_addr.S_un.S_addr);
+                }
+            }
+            AF_INET6 => {
+                state.write_u16(self.native.ss_family.0);
+                unsafe {
+                    let self_6 = *ptr::from_ref(&self.native).cast::<SOCKADDR_IN6>();
+                    state.write(&self_6.sin6_addr.u.Byte);
+                }
+            }
+            _ => state.write_u16(AF_UNSPEC.0),
+        }
+    }
+}
+
+#[derive(Clone, Copy)]
+pub struct WindowsAddressKnown {
+    pub(super) any: WindowsAddressAny,
+}
+
+impl Address for WindowsAddressKnown {
+    fn parse(raw: &str) -> Result<Self, String> {
+        let any = WindowsAddressAny::parse(raw)?;
+        match any.native.ss_family {
+            AF_INET | AF_INET6 => return Result::Ok(Self { any }),
+            _ => return Result::Err("Address resolved to unsupported AF".to_owned()),
+        }
+    }
+
+    fn to_string(self) -> String {
+        return self.any.to_string();
+    }
+}
+
+impl PartialEq for WindowsAddressKnown {
+    fn eq(&self, other: &Self) -> bool {
+        return self.any == other.any;
+    }
+}
+
+impl Eq for WindowsAddressKnown {}
+
+impl Hash for WindowsAddressKnown {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        self.any.hash(state)
+    }
+}

src/io/windows/eventloop.rs

@@ -0,0 +1,104 @@
+use crate::io::allocator::Allocator;
+use crate::io::servers_context::ServersContext;
+use crate::io::windows::task::IoTask;
+use crate::io::windows::WindowsAddressKnown;
+use std::pin::Pin;
+use std::ptr::NonNull;
+use windows::Win32::Networking::WinSock::{
+    WSARecvFrom, WSASendTo, WSASocketW, AF_UNSPEC, IPPROTO_ICMP, SOCKADDR,
+    SOCKADDR_STORAGE, SOCK_RAW, WSA_FLAG_NO_HANDLE_INHERIT, WSA_FLAG_OVERLAPPED,
+};
+use windows::Win32::System::IO::OVERLAPPED;
+
+pub unsafe fn run_eventloop<Ctx: ServersContext>(ctx: *mut Ctx) {
+    let mut heap = Allocator::<IoTask<CallbackData<_>>>::new();
+
+    let socket = WSASocketW(
+        AF_UNSPEC.0 as i32,
+        SOCK_RAW.0,
+        IPPROTO_ICMP.0,
+        None,
+        0,
+        WSA_FLAG_OVERLAPPED | WSA_FLAG_NO_HANDLE_INHERIT,
+    )
+    .unwrap();
+
+    let mut recv_task = NonNull::from_mut(&mut heap).as_mut().alloc();
+    let mut in_addr_size = 0i32;
+    let mut in_flags = 0u32;
+
+    loop {
+        for mut address in (*ctx).iter_servers() {
+            let mut data = NonNull::from_mut(&mut heap).as_mut().alloc();
+            data.init(CallbackData {
+                ctx: NonNull::new_unchecked(ctx),
+                allocator: NonNull::from_mut(&mut heap),
+                address,
+            });
+
+            let overlapped = data.get_overlapped();
+            let address =
+                NonNull::from_ref(&data.get_extra().address.any.native).cast::<SOCKADDR>();
+            WSASendTo(
+                socket,
+                data.as_ref().get_buffer_descriptors(),
+                None,
+                0,
+                Some(address.as_ptr()),
+                size_of::<SOCKADDR_STORAGE>() as i32,
+                Some(overlapped),
+                Some(sending_done::<Ctx>),
+            );
+
+            let overlapped = recv_task.get_overlapped();
+            let address =
+                NonNull::from_mut(&mut recv_task.get_extra().address.any.native).cast::<SOCKADDR>();
+            WSARecvFrom(
+                socket,
+                data.as_ref().get_buffer_descriptors(),
+                None,
+                &mut in_flags,
+                Some(address.as_ptr()),
+                Some(&mut in_addr_size),
+                Some(overlapped),
+                Some(receiving_done::<Ctx>),
+            );
+        }
+    }
+}
+
+struct CallbackData<Ctx: ServersContext> {
+    ctx: NonNull<Ctx>,
+    allocator: NonNull<Allocator<IoTask<Self>>>,
+    address: WindowsAddressKnown,
+}
+
+unsafe extern "system" fn sending_done<Ctx: ServersContext>(
+    dwerror: u32,
+    cbtransferred: u32,
+    lpoverlapped: *mut OVERLAPPED,
+    dwflags: u32,
+) {
+    let mut task = Pin::new_unchecked(
+        lpoverlapped
+            .cast::<IoTask<CallbackData<Ctx>>>()
+            .as_mut()
+            .unwrap(),
+    );
+    task.get_extra().allocator.as_mut().free(task);
+}
+
+unsafe extern "system" fn receiving_done<Ctx: ServersContext>(
+    dwerror: u32,
+    cbtransferred: u32,
+    lpoverlapped: *mut OVERLAPPED,
+    dwflags: u32,
+) {
+    let mut task = Pin::new_unchecked(
+        lpoverlapped
+            .cast::<IoTask<CallbackData<Ctx>>>()
+            .as_mut()
+            .unwrap(),
+    );
+    task.get_extra().allocator.as_mut().free(task);
+}

src/io/windows/mod.rs

@@ -1,2 +1,6 @@
 mod address;
 mod errors;
+mod eventloop;
+mod task;
+
+pub use address::{WindowsAddressAny, WindowsAddressKnown};

src/io/windows/task.rs

@@ -0,0 +1,46 @@
+use std::marker::PhantomPinned;
+use std::mem::zeroed;
+use std::pin::Pin;
+use std::ptr::NonNull;
+use windows::Win32::Networking::WinSock::WSABUF;
+use windows::Win32::System::IO::OVERLAPPED;
+use windows::core::PSTR;
+
+const _BUFF_LEN: usize = 100;
+
+#[repr(C)]
+pub struct IoTask<E> {
+    sys: OVERLAPPED,
+    __pinned: PhantomPinned,
+    buff_d: [WSABUF; 1],
+    buff: [u8; _BUFF_LEN],
+    extra: E,
+}
+
+impl<E> IoTask<E> {
+    pub unsafe fn init(self: &mut Pin<&mut Self>, extra: E) {
+        let self_unwrapped = Pin::into_inner_unchecked(NonNull::from_mut(self).read());
+        self_unwrapped.sys = zeroed();
+        self_unwrapped.buff_d[0].len = self_unwrapped.buff.len() as u32;
+        self_unwrapped.buff_d[0].buf = PSTR(self_unwrapped.buff.as_mut_ptr());
+        self_unwrapped.extra = extra
+    }
+
+    pub const BUFFER_LEN: usize = _BUFF_LEN;
+
+    pub fn get_buffer<'s>(self: &'s mut Pin<&mut Self>) -> &'s mut [u8; _BUFF_LEN] {
+        return &mut unsafe { Pin::into_inner_unchecked(NonNull::from_mut(self).read()) }.buff;
+    }
+
+    pub fn get_buffer_descriptors<'s>(self: &'s Pin<&Self>) -> &'s [WSABUF] {
+        return &unsafe { Pin::into_inner_unchecked(NonNull::from_ref(self).read()) }.buff_d;
+    }
+
+    pub fn get_extra<'s>(self: &'s mut Pin<&mut Self>) -> &'s mut E {
+        return &mut unsafe { Pin::into_inner_unchecked(NonNull::from_mut(self).read()) }.extra;
+    }
+
+    pub fn get_overlapped(self: &mut Pin<&mut Self>) -> *mut OVERLAPPED {
+        return &mut unsafe { Pin::into_inner_unchecked(NonNull::from_mut(self).read()) }.sys;
+    }
+}