Switch to async-std, refractor notifications code.

src/notifications/hive.rs

@@ -0,0 +1,57 @@
+use super::events::Notification;
+// use super::websocket;
+use crate::database::get_collection;
+
+use hive_pubsub::backend::mongo::MongodbPubSub;
+use hive_pubsub::PubSub;
+use once_cell::sync::OnceCell;
+use serde_json::to_string;
+use log::{error, debug};
+
+static HIVE: OnceCell<MongodbPubSub<String, String, Notification>> = OnceCell::new();
+
+pub async fn init_hive() {
+    let hive = MongodbPubSub::new(
+        |_ids, notification| {
+            if let Ok(data) = to_string(&notification) {
+                debug!("Pushing out notification. {}", data);
+                // ! FIXME: push to websocket
+            } else {
+                error!("Failed to serialise notification.");
+            }
+        },
+        get_collection("hive"),
+    );
+
+    if HIVE.set(hive).is_err() {
+        panic!("Failed to set global pubsub instance.");
+    }
+}
+
+pub fn publish(topic: &String, data: Notification) -> Result<(), String> {
+    let hive = HIVE.get().unwrap();
+    hive.publish(topic, data)
+}
+
+pub fn subscribe(user: String, topics: Vec<String>) -> Result<(), String> {
+    let hive = HIVE.get().unwrap();
+    for topic in topics {
+        hive.subscribe(user.clone(), topic)?;
+    }
+
+    Ok(())
+}
+
+pub fn drop_user(user: &String) -> Result<(), String> {
+    let hive = HIVE.get().unwrap();
+    hive.drop_client(user)?;
+
+    Ok(())
+}
+
+pub fn drop_topic(topic: &String) -> Result<(), String> {
+    let hive = HIVE.get().unwrap();
+    hive.drop_topic(topic)?;
+
+    Ok(())
+}