From 0e33a09d8f3da4971130dd4e4ccb8a29b8b66995 Mon Sep 17 00:00:00 2001
From: Giulio De Pasquale <depasquale@giugl.io>
Date: Mon, 4 Jan 2021 13:23:59 +0000
Subject: [PATCH] on any state on any state

---
 rustybot/src/events.rs    | 46 ++++++++++++++++++++++++++++++++++++++-
 rustybot/src/pairs.rs     |  6 +++--
 rustybot/src/positions.rs | 35 ++++++++++++++++++++---------
 3 files changed, 74 insertions(+), 13 deletions(-)

diff --git a/rustybot/src/events.rs b/rustybot/src/events.rs
index 3d4ef6c..ac96749 100644
--- a/rustybot/src/events.rs
+++ b/rustybot/src/events.rs
@@ -1,10 +1,12 @@
-use std::collections::HashMap;
+use std::collections::{HashMap, HashSet};
 use std::future::Future;
 
 use bitfinex::positions::Position;
+use tokio::stream::StreamExt;
 use tokio::task::JoinHandle;
 
 use crate::pairs::PairStatus;
+use crate::positions::{PositionState, PositionWrapper};
 use crate::BoxError;
 
 #[derive(Copy, Clone)]
@@ -32,6 +34,7 @@ pub enum EventKind {
     TrailingStopMoved,
     OrderSubmitted,
     NewTick,
+    Any,
 }
 
 #[derive(Copy, Clone)]
@@ -67,12 +70,21 @@ impl Event {
 
 pub struct EventDispatcher {
     event_handlers: HashMap<EventKind, Vec<Box<dyn Fn(&Event, &PairStatus) -> JoinHandle<()>>>>,
+    position_state_handlers:
+        HashMap<PositionState, Vec<Box<dyn Fn(&PositionWrapper, &PairStatus) -> JoinHandle<()>>>>,
+
+    on_any_event_handlers: Vec<Box<dyn Fn(&Event, &PairStatus) -> JoinHandle<()>>>,
+    on_any_position_state_handlers:
+        Vec<Box<dyn Fn(&PositionWrapper, &PairStatus) -> JoinHandle<()>>>,
 }
 
 impl EventDispatcher {
     pub fn new() -> Self {
         EventDispatcher {
             event_handlers: HashMap::new(),
+            position_state_handlers: HashMap::new(),
+            on_any_event_handlers: Vec::new(),
+            on_any_position_state_handlers: Vec::new(),
         }
     }
 
@@ -82,6 +94,24 @@ impl EventDispatcher {
                 f(event, status);
             }
         }
+
+        for f in &self.on_any_event_handlers {
+            f(event, status);
+        }
+    }
+
+    pub fn call_position_state_handlers(&self, pw: &PositionWrapper, status: &PairStatus) {
+        if let Some(state) = pw.state() {
+            if let Some(functions) = self.position_state_handlers.get(&state) {
+                for f in functions {
+                    f(pw, status);
+                }
+            }
+        }
+
+        for f in &self.on_any_position_state_handlers {
+            f(pw, status);
+        }
     }
 
     pub fn register_event_handler<F: 'static, Fut: 'static>(&mut self, event: EventKind, f: F)
@@ -94,4 +124,18 @@ impl EventDispatcher {
             .or_default()
             .push(Box::new(move |e, s| tokio::spawn(f(&e, s))));
     }
+
+    pub fn register_positionstate_handler<F: 'static, Fut: 'static>(
+        &mut self,
+        state: PositionState,
+        f: F,
+    ) where
+        F: Fn(&PositionWrapper, &PairStatus) -> Fut,
+        Fut: Future<Output = ()> + Send,
+    {
+        self.position_state_handlers
+            .entry(state)
+            .or_default()
+            .push(Box::new(move |pw, s| tokio::spawn(f(&pw, s))));
+    }
 }
diff --git a/rustybot/src/pairs.rs b/rustybot/src/pairs.rs
index 41b579c..fd507d3 100644
--- a/rustybot/src/pairs.rs
+++ b/rustybot/src/pairs.rs
@@ -45,10 +45,12 @@ impl PairStatus {
         self.positions
             .entry(self.current_tick)
             .or_default()
-            .push(pw);
+            .push(pw.clone());
 
-        // self.dispatcher.call_state_handlers(pw);
+        // calling position state callbacks
+        self.dispatcher.call_position_state_handlers(&pw, &self);
 
+        // adding events and calling callbacks
         for e in events {
             self.add_event(e);
         }
diff --git a/rustybot/src/positions.rs b/rustybot/src/positions.rs
index b199ed8..8c896ff 100644
--- a/rustybot/src/positions.rs
+++ b/rustybot/src/positions.rs
@@ -1,6 +1,6 @@
 use bitfinex::positions::Position;
 
-#[derive(Copy, Clone)]
+#[derive(Copy, Clone, Eq, PartialEq, Hash)]
 pub enum PositionState {
     Critical,
     Loss,
@@ -12,10 +12,11 @@ pub enum PositionState {
 impl PositionState {
     fn color(self) -> String {
         match self {
-            PositionState::Critical | PositionState::Loss => { "red" }
-            PositionState::BreakEven => { "yellow" }
-            PositionState::MinimumProfit | PositionState::Profit => { "green" }
-        }.into()
+            PositionState::Critical | PositionState::Loss => "red",
+            PositionState::BreakEven => "yellow",
+            PositionState::MinimumProfit | PositionState::Profit => "green",
+        }
+        .into()
     }
 }
 
@@ -28,7 +29,12 @@ pub struct PositionWrapper {
 }
 
 impl PositionWrapper {
-    pub fn new(position: Position, net_pl: f64, net_pl_perc: f64, state: Option<PositionState>) -> Self {
+    pub fn new(
+        position: Position,
+        net_pl: f64,
+        net_pl_perc: f64,
+        state: Option<PositionState>,
+    ) -> Self {
         PositionWrapper {
             position,
             net_pl,
@@ -36,8 +42,17 @@ impl PositionWrapper {
             state,
         }
     }
+
+    pub fn position(&self) -> &Position {
+        &self.position
+    }
+    pub fn net_pl(&self) -> f64 {
+        self.net_pl
+    }
+    pub fn net_pl_perc(&self) -> f64 {
+        self.net_pl_perc
+    }
+    pub fn state(&self) -> Option<PositionState> {
+        self.state
+    }
 }
-
-
-
-