Remove dependency on lazy static (#431)

The gstreamer/webrtc crates were depending
on lazy_static, but not using it.

In the case of the streams crate, lazy_static
can be replaced by the LazyLock struct from
the standard library.
(https://doc.rust-lang.org/std/sync/struct.LazyLock.html)

Signed-off-by: Simon Wülker <[email protected]>

Author: simonwuelker

Cargo.lock

@@ -23,7 +23,6 @@ gst-webrtc = { workspace = true }
 gst-sdp = { workspace = true }
 gstreamer-sys = { workspace = true }
 ipc-channel = { workspace = true }
-lazy_static = "1.2.0"
 log = "0.4"
 mime = "0.3.13"
 once_cell = "1.18.0"

backends/gstreamer/Cargo.toml

@@ -10,5 +10,4 @@ name = "servo_media_streams"
 path = "lib.rs"
 
 [dependencies]
-lazy_static = "1.0"
 uuid = { version = "1.4", features = ["v4"] }

streams/Cargo.toml

@@ -1,6 +1,3 @@
-#[macro_use]
-extern crate lazy_static;
-
 pub mod capture;
 pub mod device_monitor;
 pub mod registry;

streams/lib.rs

@@ -1,12 +1,13 @@
 use super::MediaStream;
 use std::collections::HashMap;
-use std::sync::{Arc, Mutex};
+use std::sync::{Arc, LazyLock, Mutex};
 use uuid::Uuid;
 
-lazy_static! {
-    static ref MEDIA_STREAMS_REGISTRY: Mutex<HashMap<MediaStreamId, Arc<Mutex<dyn MediaStream>>>> =
-        Mutex::new(HashMap::new());
-}
+type RegisteredMediaStream = Arc<Mutex<dyn MediaStream>>;
+
+static MEDIA_STREAMS_REGISTRY: LazyLock<Mutex<HashMap<MediaStreamId, RegisteredMediaStream>>> = LazyLock::new(|| {
+    Mutex::new(HashMap::new())
+});
 
 #[derive(Clone, Copy, Hash, Eq, PartialEq)]
 pub struct MediaStreamId(Uuid);

streams/registry.rs

@@ -9,8 +9,7 @@ edition = "2021"
 path = "lib.rs"
 
 [dependencies]
-lazy_static = "1.0"
-log = "0.4.6"
+log = "0.4"
 uuid = { version = "1.4", features = ["v4"] }
 
 [dependencies.servo-media-streams]