Made some progress towards effectful programs

orchid-extension/src/std_reqs.rs

@@ -1,3 +1,4 @@
+use std::io;
 use std::num::NonZero;
 
 use chrono::{DateTime, Utc};
@@ -58,6 +59,20 @@ pub struct IoError {
 	pub message: String,
 	pub kind: IoErrorKind,
 }
+impl From<io::Error> for IoError {
+	fn from(value: io::Error) -> Self {
+		Self {
+			message: value.to_string(),
+			kind: match value.kind() {
+				io::ErrorKind::Interrupted
+				| io::ErrorKind::BrokenPipe
+				| io::ErrorKind::NetworkDown
+				| io::ErrorKind::ConnectionReset => IoErrorKind::Interrupted,
+				_ => IoErrorKind::Other,
+			},
+		}
+	}
+}
 
 #[derive(Clone, Debug, Coding)]
 pub enum ReadLimit {
@@ -69,7 +84,9 @@ pub enum ReadLimit {
 /// Read all available data from a stream. If the returned vector is empty, the
 /// stream has reached its end.
 #[derive(Clone, Debug, Coding, Hierarchy)]
-pub struct ReadReq(pub ReadLimit);
+pub struct ReadReq {
+	pub limit: ReadLimit,
+}
 impl Request for ReadReq {
 	type Response = Result<Vec<u8>, IoError>;
 }