Logging + database migrations system.

src/database/migrations/init.rs

@@ -0,0 +1,39 @@
+use super::super::get_db;
+use super::scripts::LATEST_REVISION;
+
+use mongodb::options::CreateCollectionOptions;
+use mongodb::bson::doc;
+use log::info;
+
+pub fn create_database() {
+    info!("Creating database.");
+    let db = get_db();
+
+    db.create_collection("users", None).expect("Failed to create users collection.");
+    db.create_collection("channels", None).expect("Failed to create channels collection.");
+    db.create_collection("guilds", None).expect("Failed to create guilds collection.");
+    db.create_collection("members", None).expect("Failed to create members collection.");
+    db.create_collection("messages", None).expect("Failed to create messages collection.");
+    db.create_collection("migrations", None).expect("Failed to create migrations collection.");
+
+    db.create_collection(
+        "pubsub",
+        CreateCollectionOptions::builder()
+            .capped(true)
+            .size(1_000_000)
+            .build()
+    )
+    .expect("Failed to create pubsub collection.");
+
+    db.collection("migrations")
+        .insert_one(
+            doc! {
+                "_id": 0,
+                "revision": LATEST_REVISION
+            },
+            None
+        )
+        .expect("Failed to save migration info.");
+    
+    info!("Created database.");
+}