From f5a60f387d2278aa3bddac5c0a0ec110fbf5377e Mon Sep 17 00:00:00 2001
From: Zeyla Hellyer <zey@zey.moe>
Date: Mon, 1 Jan 2018 09:45:52 -0800
Subject: Expose a method of retrieving shard status/latency

This exposes a method of retrieving a shard's status and latency through
the Shard Manager, as part of the existing Shard Runner Info struct. The
Shard Runner will update this whenever it notices a change.
---
 src/client/bridge/gateway/mod.rs                   | 13 ++++++++++
 src/client/bridge/gateway/shard_manager_monitor.rs |  9 +++++++
 src/client/bridge/gateway/shard_queuer.rs          |  3 +++
 src/client/bridge/gateway/shard_runner.rs          | 28 +++++++++++++++++++++-
 4 files changed, 52 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/client/bridge/gateway/mod.rs b/src/client/bridge/gateway/mod.rs
index c5410e6..5c9ec69 100644
--- a/src/client/bridge/gateway/mod.rs
+++ b/src/client/bridge/gateway/mod.rs
@@ -63,6 +63,8 @@ pub use self::shard_runner_message::ShardRunnerMessage;
 
 use std::fmt::{Display, Formatter, Result as FmtResult};
 use std::sync::mpsc::Sender;
+use std::time::Duration as StdDuration;
+use ::gateway::ConnectionStage;
 
 /// A message either for a [`ShardManager`] or a [`ShardRunner`].
 ///
@@ -88,6 +90,12 @@ pub enum ShardManagerMessage {
     ///
     /// [`ShardManagerMonitor`]: struct.ShardManagerMonitor.html
     Restart(ShardId),
+    /// An update from a shard runner,
+    ShardUpdate {
+        id: ShardId,
+        latency: Option<StdDuration>,
+        stage: ConnectionStage,
+    },
     /// Indicator that a [`ShardManagerMonitor`] should fully shutdown a shard
     /// without bringing it back up.
     ///
@@ -140,7 +148,12 @@ impl Display for ShardId {
 /// [`ShardRunner`]: struct.ShardRunner.html
 #[derive(Debug)]
 pub struct ShardRunnerInfo {
+    /// The latency between when a heartbeat was sent and when the
+    /// acknowledgement was received.
+    pub latency: Option<StdDuration>,
     /// The channel used to communicate with the shard runner, telling it
     /// what to do with regards to its status.
     pub runner_tx: Sender<ShardClientMessage>,
+    /// The current connection stage of the shard.
+    pub stage: ConnectionStage,
 }
diff --git a/src/client/bridge/gateway/shard_manager_monitor.rs b/src/client/bridge/gateway/shard_manager_monitor.rs
index d98827d..9f9c04d 100644
--- a/src/client/bridge/gateway/shard_manager_monitor.rs
+++ b/src/client/bridge/gateway/shard_manager_monitor.rs
@@ -40,6 +40,15 @@ impl ShardManagerMonitor {
                 ShardManagerMessage::Restart(shard_id) => {
                     self.manager.lock().restart(shard_id);
                 },
+                ShardManagerMessage::ShardUpdate { id, latency, stage } => {
+                    let manager = self.manager.lock();
+                    let mut runners = manager.runners.lock();
+
+                    runners.get_mut(&id).map(|runner| {
+                        runner.latency = latency;
+                        runner.stage = stage;
+                    });
+                }
                 ShardManagerMessage::Shutdown(shard_id) => {
                     self.manager.lock().shutdown(shard_id);
                 },
diff --git a/src/client/bridge/gateway/shard_queuer.rs b/src/client/bridge/gateway/shard_queuer.rs
index 30a0906..461fdd1 100644
--- a/src/client/bridge/gateway/shard_queuer.rs
+++ b/src/client/bridge/gateway/shard_queuer.rs
@@ -16,6 +16,7 @@ use super::{
 };
 use threadpool::ThreadPool;
 use typemap::ShareMap;
+use ::gateway::ConnectionStage;
 
 #[cfg(feature = "framework")]
 use framework::Framework;
@@ -184,7 +185,9 @@ impl<H: EventHandler + Send + Sync + 'static> ShardQueuer<H> {
         }};
 
         let runner_info = ShardRunnerInfo {
+            latency: None,
             runner_tx: runner.runner_tx(),
+            stage: ConnectionStage::Disconnected,
         };
 
         thread::spawn(move || {
diff --git a/src/client/bridge/gateway/shard_runner.rs b/src/client/bridge/gateway/shard_runner.rs
index cff8d7e..7c6cf83 100644
--- a/src/client/bridge/gateway/shard_runner.rs
+++ b/src/client/bridge/gateway/shard_runner.rs
@@ -141,8 +141,16 @@ impl<H: EventHandler + Send + Sync + 'static> ShardRunner<H> {
                 }
             }
 
+            let pre = self.shard.stage();
+
             let (event, action, successful) = self.recv_event();
 
+            let post = self.shard.stage();
+
+            if post != pre {
+                self.update_manager();
+            }
+
             match action {
                 Some(ShardAction::Reconnect(ReconnectType::Reidentify)) => {
                     return self.request_restart()
@@ -249,7 +257,8 @@ impl<H: EventHandler + Send + Sync + 'static> ShardRunner<H> {
 
                     true
                 },
-                ShardManagerMessage::ShutdownInitiated => {
+                ShardManagerMessage::ShardUpdate { .. }
+                    | ShardManagerMessage::ShutdownInitiated => {
                     // nb: not sent here
 
                     true
@@ -411,6 +420,13 @@ impl<H: EventHandler + Send + Sync + 'static> ShardRunner<H> {
             },
         };
 
+        match event {
+            Ok(GatewayEvent::HeartbeatAck) => {
+                self.update_manager();
+            },
+            _ => {},
+        }
+
         let event = match event {
             Ok(GatewayEvent::Dispatch(_, event)) => Some(event),
             _ => None,
@@ -420,6 +436,8 @@ impl<H: EventHandler + Send + Sync + 'static> ShardRunner<H> {
     }
 
     fn request_restart(&self) -> Result<()> {
+        self.update_manager();
+
         debug!(
             "[ShardRunner {:?}] Requesting restart",
             self.shard.shard_info(),
@@ -430,4 +448,12 @@ impl<H: EventHandler + Send + Sync + 'static> ShardRunner<H> {
 
         Ok(())
     }
+
+    fn update_manager(&self) {
+        let _ = self.manager_tx.send(ShardManagerMessage::ShardUpdate {
+            id: ShardId(self.shard.shard_info()[0]),
+            latency: self.shard.latency(),
+            stage: self.shard.stage(),
+        });
+    }
 }
-- 
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