Fix Rust DataConsumer

[ibc]

• set_subchannels() method must exist not only in DirectDataConsumer but also in RegularDataConsumer.
• Fix wrong usage of DataConsumer in tests.

[ibc]

Issue (NOTE: FIXED)

cargo fails with this:

cargo test
   Compiling mediasoup-sys v0.7.0 (/Users/ibc/src/v3-mediasoup/worker)
   Compiling mediasoup v0.13.0 (/Users/ibc/src/v3-mediasoup/rust)
error[E0599]: no method named `set_subchannels` found for reference `&DirectDataConsumer` in the current scope
   --> rust/tests/integration/direct_transport.rs:518:14
    |
517 | /         direct_data_consumer_2
518 | |             .set_subchannels(subchannels)
    | |             -^^^^^^^^^^^^^^^ method not found in `&DirectDataConsumer`
    | |_____________|
    |

For more information about this error, try `rustc --explain E0599`.
error: could not compile `mediasoup` (test "integration") due to previous error

Comments by @nazar-pc:

There is probably Deref implementation, that dereferences to underlying data structure that provides generic methods.

The same way as Vec<u8> dereferences to &[u8], so you can call slice methods on Vec<u8> directly.

https://doc.rust-lang.org/std/ops/trait.Deref.html
It is pretty neat actually, but I admit might be a bit confusing at first. It also goes exactly one level, so it is fairly straightforward to work with.

There are a few things. DirectDataConsumer impl is in a very different place than struct definition, I don't like that, they should be close to each other. Second, You have DataConsumer, it is an enum. You can match and get inner variant or you can turn inner variant back into enum with From implementation.

It is literally what it sounds like

mediasoup/rust/src/router/data_consumer.rs

Lines 436 to 442 in 042b7f5

	pub enum DataConsumer {
	/// Data consumer created on transport other than
	/// [`DirectTransport`](crate::direct_transport::DirectTransport).
	Regular(RegularDataConsumer),
	/// Data consumer created on [`DirectTransport`](crate::direct_transport::DirectTransport).
	Direct(DirectDataConsumer),
	}

. Enum is just a fancy struct, it can have methods just like any other struct can in Rust.

[jmillan]

data_consumer_2 there should be used as it is.

diff --git a/rust/tests/integration/direct_transport.rs b/rust/tests/integration/direct_transport.rs
index 380f3e1b3..6053de020 100644
--- a/rust/tests/integration/direct_transport.rs
+++ b/rust/tests/integration/direct_transport.rs
@@ -430,7 +430,7 @@ fn send_with_subchannels_succeeds() {
             }
         };

-        let direct_data_consumer_2 = match &data_consumer_2 {
+        let _ = match &data_consumer_2 {
             DataConsumer::Direct(direct_data_consumer) => direct_data_consumer,
             _ => {
                 panic!("Expected direct data consumer")
@@ -514,7 +514,7 @@ fn send_with_subchannels_succeeds() {
         let mut subchannels = data_consumer_2.subchannels();
         subchannels.push(1);

-        direct_data_consumer_2
+        data_consumer_2
             .set_subchannels(subchannels)
             .await
             .expect("Failed to set subchannels");

All methods are implemented for DataConsumer regardless it's a RegularDataConsumer or DirectDataConsumer. There is no need to duplicate those.

[ibc]

cargo test
   Compiling mediasoup v0.13.0 (/Users/ibc/src/v3-mediasoup/rust)
warning: unused variable: `router`
   --> rust/tests/integration/data_consumer.rs:323:23
    |
323 |         let (_worker, router, transport1, data_producer) = init().await;
    |                       ^^^^^^ help: if this is intentional, prefix it with an underscore: `_router`
    |
    = note: `#[warn(unused_variables)]` on by default

error: literal out of range for `u16`
   --> rust/tests/integration/data_consumer.rs:338:47
    |
338 |             .set_subchannels([ 999, 999, 998, 65536 ].to_vec())
    |                                               ^^^^^
    |
    = note: the literal `65536` does not fit into the type `u16` whose range is `0..=65535`
    = note: `#[deny(overflowing_literals)]` on by default

[ibc]

cargo test
   Compiling mediasoup v0.13.0 (/Users/ibc/src/v3-mediasoup/rust)
warning: unused variable: `router`
   --> rust/tests/integration/data_consumer.rs:323:23
    |
323 |         let (_worker, router, transport1, data_producer) = init().await;
    |                       ^^^^^^ help: if this is intentional, prefix it with an underscore: `_router`
    |
    = note: `#[warn(unused_variables)]` on by default

error: literal out of range for `u16`
   --> rust/tests/integration/data_consumer.rs:338:47
    |
338 |             .set_subchannels([ 999, 999, 998, 65536 ].to_vec())
    |                                               ^^^^^
    |
    = note: the literal `65536` does not fit into the type `u16` whose range is `0..=65535`
    = note: `#[deny(overflowing_literals)]` on by default

I'm on it.