bug: cannot start the example project

[NickKhalow]

Issue

Cannot run the example due the error. Arguments URL and TOKEN are passed. URL value starts with 'wss://' is used as the argument. I had some suspicious about the format, but we use websockets in production without any issues.

Reproduced on both MacOS and Windows.

Repro steps

1. Download repository
2. Go-to ./examples/play_from_disk
3. Put LIVEKIT_URL and LIVEKIT_TOKEN env variables
4. Launch normally by cargo run
5. Error:

thread 'main' panicked at src\main.rs:135:10:
called `Result::unwrap()` on an `Err` value: Engine(Signal(RegionError("error sending request for url (https://dcl.livekit.cloud/settings/regions): error trying to connect: invalid URL, scheme is not http")))
stack backtrace:
   0: std::panicking::begin_panic_handler
             at /rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/library\std\src\panicking.rs:697
   1: core::panicking::panic_fmt
             at /rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/library\core\src\panicking.rs:75
   2: core::result::unwrap_failed
             at /rustc/6b00bc3880198600130e1cf62b8f8a93494488cc/library\core\src\result.rs:1732
   3: enum2$<core::result::Result<tuple$<livekit::room::Room,tokio::sync::mpsc::unbounded::UnboundedReceiver<enum2$<livekit::room::RoomEvent> > >,enum2$<livekit::room::RoomError> > >::unwrap
             at C:\Users\user\.rustup\toolchains\stable-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\core\src\result.rs:1137
   4: play_from_disk::main::async_block$0
             at .\src\main.rs:133
   5: tokio::runtime::park::impl$4::block_on::closure$0<enum2$<play_from_disk::main::async_block_env$0> >
             at C:\Users\user\.cargo\registry\src\index.crates.io-1949cf8c6b5b557f\tokio-1.36.0\src\runtime\park.rs:281
   6: tokio::runtime::coop::with_budget
             at C:\Users\user\.cargo\registry\src\index.crates.io-1949cf8c6b5b557f\tokio-1.36.0\src\runtime\coop.rs:107
   7: tokio::runtime::coop::budget
             at C:\Users\user\.cargo\registry\src\index.crates.io-1949cf8c6b5b557f\tokio-1.36.0\src\runtime\coop.rs:73
   8: tokio::runtime::park::CachedParkThread::block_on<enum2$<play_from_disk::main::async_block_env$0> >
             at C:\Users\user\.cargo\registry\src\index.crates.io-1949cf8c6b5b557f\tokio-1.36.0\src\runtime\park.rs:281
   9: tokio::runtime::context::blocking::BlockingRegionGuard::block_on<enum2$<play_from_disk::main::async_block_env$0> >
             at C:\Users\user\.cargo\registry\src\index.crates.io-1949cf8c6b5b557f\tokio-1.36.0\src\runtime\context\blocking.rs:66
  10: tokio::runtime::scheduler::multi_thread::impl$0::block_on::closure$0<enum2$<play_from_disk::main::async_block_env$0> >
             at C:\Users\user\.cargo\registry\src\index.crates.io-1949cf8c6b5b557f\tokio-1.36.0\src\runtime\scheduler\multi_thread\mod.rs:87
  11: tokio::runtime::context::runtime::enter_runtime<tokio::runtime::scheduler::multi_thread::impl$0::block_on::closure_env$0<enum2$<play_from_disk::main::async_block_env$0> >,enum2$<core::result::Result<tuple$<>,alloc::boxed::Box<dyn$<core::error::Error>,alloc
             at C:\Users\user\.cargo\registry\src\index.crates.io-1949cf8c6b5b557f\tokio-1.36.0\src\runtime\context\runtime.rs:65
  12: tokio::runtime::scheduler::multi_thread::MultiThread::block_on<enum2$<play_from_disk::main::async_block_env$0> >
             at C:\Users\user\.cargo\registry\src\index.crates.io-1949cf8c6b5b557f\tokio-1.36.0\src\runtime\scheduler\multi_thread\mod.rs:86
  13: tokio::runtime::runtime::Runtime::block_on<enum2$<play_from_disk::main::async_block_env$0> >
             at C:\Users\user\.cargo\registry\src\index.crates.io-1949cf8c6b5b557f\tokio-1.36.0\src\runtime\runtime.rs:350
  14: play_from_disk::main
             at .\src\main.rs:198
  15: core::ops::function::FnOnce::call_once<enum2$<core::result::Result<tuple$<>,alloc::boxed::Box<dyn$<core::error::Error>,alloc::alloc::Global> > > (*)(),tuple$<> >
             at C:\Users\user\.rustup\toolchains\stable-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\core\src\ops\function.rs:250
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
error: process didn't exit successfully: `target\debug\play_from_disk.exe` (exit code: 101)

[ladvoc]

Hi @NickKhalow, thank you for reporting this. I was able to reproduce the issue, and I found the root cause is reqwest does not have a TLS library to use unless one of the TLS features is enabled on the LiveKit crate (see Cargo.toml). As a quick fix, in the example's Cargo.toml, you can enable one of the TLS features:

livekit = { path = "../../livekit", features = ["rustls-tls-native-roots"] }

This will be made the default for all examples going forward.

[NickKhalow]

The error is gone, but It still won't connect due another error:

Error: Cannot start the room on url: https://dm.livekit.cloud/my-room

Caused by:
    0: engine: signal failure: failed to retrieve region info: error decoding response body: expected value at line 1 column 1
    1: signal failure: failed to retrieve region info: error decoding response body: expected value at line 1 column 1
    2: failed to retrieve region info: error decoding response body: expected value at line 1 column 1

Do you have a hint what it could be?

UPD: I attach backtrace below:

thread 'main' panicked at save_to_disk/src/main.rs:94:10:
called `Result::unwrap()` on an `Err` value: Engine(Signal(RegionError("error decoding response body: expected value at line 1 column 1")))
stack backtrace:
   0: __rustc::rust_begin_unwind
             at /rustc/17067e9ac6d7ecb70e50f92c1944e545188d2359/library/std/src/panicking.rs:697:5
   1: core::panicking::panic_fmt
             at /rustc/17067e9ac6d7ecb70e50f92c1944e545188d2359/library/core/src/panicking.rs:75:14
   2: core::result::unwrap_failed
             at /rustc/17067e9ac6d7ecb70e50f92c1944e545188d2359/library/core/src/result.rs:1704:5
   3: core::result::Result<T,E>::unwrap
             at /Users/nickkhalow/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/src/rust/library/core/src/result.rs:1109:23
   4: save_to_disk::main::{{closure}}
             at ./src/main.rs:92:26
   5: tokio::runtime::park::CachedParkThread::block_on::{{closure}}
             at /Users/nickkhalow/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.35.1/src/runtime/park.rs:282:63
   6: tokio::runtime::coop::with_budget
             at /Users/nickkhalow/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.35.1/src/runtime/coop.rs:107:5
   7: tokio::runtime::coop::budget
             at /Users/nickkhalow/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.35.1/src/runtime/coop.rs:73:5
   8: tokio::runtime::park::CachedParkThread::block_on
             at /Users/nickkhalow/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.35.1/src/runtime/park.rs:282:31
   9: tokio::runtime::context::blocking::BlockingRegionGuard::block_on
             at /Users/nickkhalow/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.35.1/src/runtime/context/blocking.rs:66:9
  10: tokio::runtime::scheduler::multi_thread::MultiThread::block_on::{{closure}}
             at /Users/nickkhalow/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.35.1/src/runtime/scheduler/multi_thread/mod.rs:87:13
  11: tokio::runtime::context::runtime::enter_runtime
             at /Users/nickkhalow/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.35.1/src/runtime/context/runtime.rs:65:16
  12: tokio::runtime::scheduler::multi_thread::MultiThread::block_on
             at /Users/nickkhalow/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.35.1/src/runtime/scheduler/multi_thread/mod.rs:86:9
  13: tokio::runtime::runtime::Runtime::block_on
             at /Users/nickkhalow/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.35.1/src/runtime/runtime.rs:350:45
  14: save_to_disk::main
             at ./src/main.rs:97:5
  15: core::ops::function::FnOnce::call_once
             at /Users/nickkhalow/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/src/rust/library/core/src/ops/function.rs:250:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.