Initial project

.gitignore

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+/target
+.vscode/
+Cargo.lock

Cargo.toml

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+[package]
+name = "tourbillon"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+color-eyre = "0.6.2"
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"

src/main.rs

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+mod protocol;
+use protocol::message::Message;
+
+fn main() -> color_eyre::Result<()> {
+    color_eyre::install()?;
+
+    println!("Hello, world!");
+    Ok(())
+}

src/protocol.rs

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+pub mod message;

src/protocol/message.rs

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+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Deserialize, Serialize)]
+pub struct Message {
+    src: String,
+    #[serde(rename = "dest")]
+    dst: String,
+    body: MessageBody,
+}
+#[derive(Debug, Deserialize, Serialize)]
+pub struct MessageBody {
+    #[serde(rename = "msg_id")]
+    id: Option<u64>,
+    in_reply_to: Option<u64>,
+
+    #[serde(flatten)]
+    data: MessagePayload,
+}
+
+#[derive(Debug, Deserialize, Serialize, PartialEq)]
+#[serde(tag = "type")]
+#[serde(rename_all = "snake_case")]
+pub enum MessagePayload {
+    Init {
+        node_id: String,
+        #[serde(rename = "node_ids")]
+        nodes: Vec<String>,
+    },
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn protocol_decode_init() -> color_eyre::Result<()> {
+        let json_input = r###"{
+        "src":      "c1",
+        "dest":     "n3",
+        "body": {
+            "type":     "init",
+            "msg_id":   1,
+            "node_id":  "n3",
+            "node_ids": ["n1", "n2", "n3"]
+        }
+      }
+    "###;
+
+        let msg = serde_json::from_str::<Message>(json_input)?;
+
+        assert!(matches!(msg.body.data, MessagePayload::Init { .. }));
+        Ok(())
+    }
+}