Implement yunq server in rust.

rust/lib/yunq/src/server.rs

@@ -0,0 +1,46 @@
+use crate::buffer::ByteBuffer;
+use alloc::vec::Vec;
+use mammoth::syscall;
+use mammoth::zion::z_cap_t;
+use mammoth::zion::ZError;
+
+pub trait YunqServer {
+    fn server_loop(&self) {
+        loop {
+            let mut byte_buffer = ByteBuffer::<1024>::new();
+            let mut cap_buffer = vec![0; 10];
+            let (_, _, reply_port_cap) = syscall::endpoint_recv(
+                self.endpoint_cap(),
+                byte_buffer.mut_slice(),
+                &mut cap_buffer,
+            )
+            .expect("Failed to call endpoint recv");
+
+            let method = byte_buffer
+                .at::<u64>(8)
+                .expect("Failed to access request length.");
+            let resp = self.handle_request(method, &mut byte_buffer, &mut cap_buffer);
+            match resp {
+                Ok(resp_len) => syscall::reply_port_send(
+                    reply_port_cap,
+                    byte_buffer.slice(resp_len),
+                    &cap_buffer,
+                )
+                .expect("Failed to reply"),
+                Err(err) => {
+                    crate::message::serialize_error(&mut byte_buffer, err);
+                    syscall::reply_port_send(reply_port_cap, &byte_buffer.slice(0x10), &[])
+                        .expect("Failed to reply w/ error")
+                }
+            }
+        }
+    }
+
+    fn endpoint_cap(&self) -> z_cap_t;
+    fn handle_request(
+        &self,
+        method_number: u64,
+        byte_buffer: &mut ByteBuffer<1024>,
+        cap_buffer: &mut Vec<z_cap_t>,
+    ) -> Result<usize, ZError>;
+}