1 files changed, 41 insertions, 0 deletions
diff --git a/common/src/lib.rs b/common/src/lib.rs
new file mode 100644
index 0000000..d0db5d1
--- /dev/null
+++ b/common/src/lib.rs
@@ -0,0 +1,41 @@
+use std::io::{Stdout, Write};
+
+use msg::{MaelstromBodyOr, Message, MessageHeader};
+use serde::{Deserialize, Serialize};
+
+pub mod msg;
+
+pub trait Handler {
+    type Body: Serialize + for<'a> Deserialize<'a>;
+
+    fn init(node_id: String, node_ids: Vec<String>, msg_id: usize) -> Self;
+    fn handle(
+        &mut self,
+        header: MessageHeader,
+        body: Self::Body,
+        writer: &mut MsgWriter<Self::Body>,
+    ) -> ();
+}
+
+pub struct MsgWriter<W> {
+    node_id: String,
+    writer: W,
+}
+
+impl<W: Write> MsgWriter<W> {
+    pub fn new(node_id: String, writer: W) -> Self {
+        Self { node_id, writer }
+    }
+
+    pub fn write<T: Serialize>(&mut self, dst: String, msg: &T) {
+        let msg = Message {
+            header: MessageHeader {
+                src: self.node_id.clone(),
+                dst,
+            },
+            body: MaelstromBodyOr::Other { inner: msg },
+        };
+        serde_json::to_writer(&mut self.writer, &msg).unwrap();
+        self.writer.write(&[b'\n']).unwrap();
+    }
+}