Implemented P2P network protocol. Refactored project structure.

src/p2p/message.rs

@@ -0,0 +1,47 @@
+extern crate serde;
+extern crate serde_json;
+
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Serialize, Deserialize)]
+pub enum Message {
+    Error,
+    Hand { chain: String, version: u32 },
+    Shake { ok: bool, height: u64 },
+    Ping { height: u64 },
+    Pong { height: u64 },
+    GetPeers,
+    Peers,
+    GetBlock { index: u64 },
+    Block { index: u64, block: String },
+}
+
+impl Message {
+    pub fn from_bytes(bytes: Vec<u8>) -> Result<Self, ()> {
+        let text = String::from_utf8(bytes).unwrap_or(String::from("Error{}"));
+        match serde_json::from_str(&text) {
+            Ok(cmd) => Ok(cmd),
+            Err(_) => Err(())
+        }
+    }
+
+    pub fn hand(chain: &str, version: u32) -> Self {
+        Message::Hand { chain: chain.to_owned(), version }
+    }
+
+    pub fn shake(ok: bool, height: u64) -> Self {
+        Message::Shake { ok, height }
+    }
+
+    pub fn ping(height: u64) -> Self {
+        Message::Ping { height }
+    }
+
+    pub fn pong(height: u64) -> Self {
+        Message::Pong { height }
+    }
+
+    pub fn block(height: u64, str: String) -> Self {
+        Message::Block { index: height, block: str }
+    }
+}