feat: enhance HyperliquidMonitor to parse and emit all trade actions: Open, Increase, Decrease, Close

src/structs.rs

@@ -1,10 +1,26 @@
-/// Represents a detected position opening event on Hyperliquid.
+/// The action type of a trade fill relative to the position.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum TradeAction {
+    /// Opening a position (initial position size was 0)
+    Open,
+    /// Adding to an existing position (absolute position size increases)
+    Increase,
+    /// Reducing an existing position (absolute position size decreases but remains non-zero)
+    Decrease,
+    /// Fully closing an existing position (resulting position size becomes 0)
+    Close,
+}
+
+/// Represents a detected trade event on Hyperliquid affecting a wallet's position.
 #[derive(Debug, Clone)]
-pub struct PositionOpenEvent {
+pub struct PositionTradeEvent {
     pub coin: String,
     pub side: String, // "B" (Buy) or "S" (Sell)
     pub px: String,   // Price as string
-    pub sz: String,   // Size as string
+    pub sz: String,   // Trade size as string
     pub time: u64,    // Epoch timestamp in milliseconds
-    pub tid: u64,     // Unique trade/fill ID
+    pub tid: u64,     // Unique trade ID
+    pub action: TradeAction,
+    pub start_pos: String, // Position size before the trade
+    pub end_pos: String,   // Position size after the trade
 }