add demo downloading

Cargo.toml

@@ -12,10 +12,12 @@ exclude = [ "tests/data/gully.dem" ]
 [dependencies]
 serde = { version = "1", features = ["derive"] }
 time = { version = "0.3", features = ["serde"] }
-reqwest = { version = "0.11", default-features = false, features = ["json", "multipart"] }
+reqwest = { version = "0.11", default-features = false, features = ["json", "multipart", "stream"] }
 thiserror = "1"
 hex = "0.4"
 steamid-ng = "1"
+bytes = "1.1.0"
+futures-util = "0.3.21"
 
 [dev-dependencies]
 tokio = { version = "1", features = ["macros"] }

src/lib.rs

@@ -1,3 +1,5 @@
+use bytes::Bytes;
+use futures_util::{Stream, StreamExt};
 use reqwest::{multipart, Client, IntoUrl, StatusCode, Url};
 use serde::{Deserialize, Deserializer, Serialize, Serializer};
 use std::borrow::Cow;
@@ -64,6 +66,19 @@ impl Demo {
             Ok(Cow::Owned(demo.players))
         }
     }
+
+    pub async fn download(
+        &self,
+        client: &ApiClient,
+    ) -> Result<impl Stream<Item = Result<Bytes, Error>>, Error> {
+        Ok(client
+            .client
+            .get(&self.url)
+            .send()
+            .await?
+            .bytes_stream()
+            .map(|chunk| Ok(chunk?)))
+    }
 }
 
 /// Reference to a user, either contains the full user information or only the user id