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Merge pull request #340 from mitchmindtree/thiserror 

Switch to dtolnay's `thiserror` for handling error boilerplate
This commit is contained in:
est31 2019-10-13 12:58:52 +02:00 committed by GitHub
parent be54ffff09 7b08cb0dae
commit 5fa5ae8cff
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GPG Key ID: 4AEE18F83AFDEB23
7 changed files with 52 additions and 107 deletions
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3
Cargo.toml
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@ -12,11 +12,12 @@ keywords = ["audio", "sound"]
asio = ["asio-sys"] # Only available on Windows. See README for setup instructions.
[dependencies]
failure = "0.1.5"
thiserror = "1.0.2"
lazy_static = "1.3"
num-traits = "0.2.6"
[dev-dependencies]
anyhow = "1.0.12"
hound = "3.4"
ringbuf = "0.1.6"

4
examples/beep.rs
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@ -1,9 +1,9 @@
extern crate anyhow;
extern crate cpal;
extern crate failure;
use cpal::traits::{DeviceTrait, EventLoopTrait, HostTrait};
fn main() -> Result<(), failure::Error> {
fn main() -> Result<(), anyhow::Error> {
let host = cpal::default_host();
let device = host.default_output_device().expect("failed to find a default output device");
let format = device.default_output_format()?;

4
examples/enumerate.rs
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@ -1,9 +1,9 @@
extern crate cpal;
extern crate failure;
extern crate anyhow;
use cpal::traits::{DeviceTrait, HostTrait};
fn main() -> Result<(), failure::Error> {
fn main() -> Result<(), anyhow::Error> {
println!("Supported hosts:\n {:?}", cpal::ALL_HOSTS);
let available_hosts = cpal::available_hosts();
println!("Available hosts:\n {:?}", available_hosts);

4
examples/feedback.rs
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@ -6,8 +6,8 @@
//! Uses a delay of `LATENCY_MS` milliseconds in case the default input and output streams are not
//! precisely synchronised.
extern crate anyhow;
extern crate cpal;
extern crate failure;
extern crate ringbuf;
use cpal::traits::{DeviceTrait, EventLoopTrait, HostTrait};
@ -15,7 +15,7 @@ use ringbuf::RingBuffer;
const LATENCY_MS: f32 = 150.0;
fn main() -> Result<(), failure::Error> {
fn main() -> Result<(), anyhow::Error> {
let host = cpal::default_host();
let event_loop = host.event_loop();

4
examples/record_wav.rs
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@ -2,13 +2,13 @@
//!
//! The input data is recorded to "$CARGO_MANIFEST_DIR/recorded.wav".
extern crate anyhow;
extern crate cpal;
extern crate failure;
extern crate hound;
use cpal::traits::{DeviceTrait, EventLoopTrait, HostTrait};
fn main() -> Result<(), failure::Error> {
fn main() -> Result<(), anyhow::Error> {
// Use the default host for working with audio devices.
let host = cpal::default_host();

138
src/error.rs
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@ -1,8 +1,8 @@
use failure::Fail;
use thiserror::Error;
/// The requested host, although supported on this platform, is unavailable.
#[derive(Clone, Debug, Fail)]
#[fail(display = "the requested host is unavailable")]
#[derive(Clone, Debug, Error)]
#[error("the requested host is unavailable")]
pub struct HostUnavailable;
/// Some error has occurred that is specific to the backend from which it was produced.
@ -17,101 +17,95 @@ pub struct HostUnavailable;
/// **Note:** If you notice a `BackendSpecificError` that you believe could be better handled in a
/// cross-platform manner, please create an issue or submit a pull request with a patch that adds
/// the necessary error variant to the appropriate error enum.
#[derive(Clone, Debug, Fail)]
#[fail(display = "A backend-specific error has occurred: {}", description)]
#[derive(Clone, Debug, Error)]
#[error("A backend-specific error has occurred: {description}")]
pub struct BackendSpecificError {
pub description: String,
}
/// An error that might occur while attempting to enumerate the available devices on a system.
#[derive(Debug, Fail)]
#[derive(Debug, Error)]
pub enum DevicesError {
/// See the `BackendSpecificError` docs for more information about this error variant.
#[fail(display = "{}", err)]
#[error("{err}")]
BackendSpecific {
#[fail(cause)]
#[from]
err: BackendSpecificError,
},
}
/// An error that may occur while attempting to retrieve a device name.
#[derive(Debug, Fail)]
#[derive(Debug, Error)]
pub enum DeviceNameError {
/// See the `BackendSpecificError` docs for more information about this error variant.
#[fail(display = "{}", err)]
#[error("{err}")]
BackendSpecific {
#[fail(cause)]
#[from]
err: BackendSpecificError,
},
}
/// Error that can happen when enumerating the list of supported formats.
#[derive(Debug, Fail)]
#[derive(Debug, Error)]
pub enum SupportedFormatsError {
/// The device no longer exists. This can happen if the device is disconnected while the
/// program is running.
#[fail(
display = "The requested device is no longer available. For example, it has been unplugged."
)]
#[error("The requested device is no longer available. For example, it has been unplugged.")]
DeviceNotAvailable,
/// We called something the C-Layer did not understand
#[fail(
display = "Invalid argument passed to the backend. For example, this happens when trying to read capture capabilities when the device does not support it."
#[error(
"Invalid argument passed to the backend. For example, this happens when trying to read capture capabilities when the device does not support it."
)]
InvalidArgument,
/// See the `BackendSpecificError` docs for more information about this error variant.
#[fail(display = "{}", err)]
#[error("{err}")]
BackendSpecific {
#[fail(cause)]
#[from]
err: BackendSpecificError,
},
}
/// May occur when attempting to request the default input or output stream format from a `Device`.
#[derive(Debug, Fail)]
#[derive(Debug, Error)]
pub enum DefaultFormatError {
/// The device no longer exists. This can happen if the device is disconnected while the
/// program is running.
#[fail(
display = "The requested device is no longer available. For example, it has been unplugged."
)]
#[error("The requested device is no longer available. For example, it has been unplugged.")]
DeviceNotAvailable,
/// Returned if e.g. the default input format was requested on an output-only audio device.
#[fail(display = "The requested stream type is not supported by the device.")]
#[error("The requested stream type is not supported by the device.")]
StreamTypeNotSupported,
/// See the `BackendSpecificError` docs for more information about this error variant.
#[fail(display = "{}", err)]
#[error("{err}")]
BackendSpecific {
#[fail(cause)]
#[from]
err: BackendSpecificError,
},
}
/// Error that can happen when creating a `Stream`.
#[derive(Debug, Fail)]
#[derive(Debug, Error)]
pub enum BuildStreamError {
/// The device no longer exists. This can happen if the device is disconnected while the
/// program is running.
#[fail(
display = "The requested device is no longer available. For example, it has been unplugged."
)]
#[error("The requested device is no longer available. For example, it has been unplugged.")]
DeviceNotAvailable,
/// The required format is not supported.
#[fail(display = "The requested stream format is not supported by the device.")]
#[error("The requested stream format is not supported by the device.")]
FormatNotSupported,
/// We called something the C-Layer did not understand
///
/// On ALSA device functions called with a feature they do not support will yield this. E.g.
/// Trying to use capture capabilities on an output only format yields this.
#[fail(display = "The requested device does not support this capability (invalid argument)")]
#[error("The requested device does not support this capability (invalid argument)")]
InvalidArgument,
/// Occurs if adding a new Stream ID would cause an integer overflow.
#[fail(display = "Adding a new stream ID would cause an overflow")]
#[error("Adding a new stream ID would cause an overflow")]
StreamIdOverflow,
/// See the `BackendSpecificError` docs for more information about this error variant.
#[fail(display = "{}", err)]
#[error("{err}")]
BackendSpecific {
#[fail(cause)]
#[from]
err: BackendSpecificError,
},
}
@ -121,15 +115,15 @@ pub enum BuildStreamError {
/// As of writing this, only macOS may immediately return an error while calling this method. This
/// is because both the alsa and wasapi backends only enqueue these commands and do not process
/// them immediately.
#[derive(Debug, Fail)]
#[derive(Debug, Error)]
pub enum PlayStreamError {
/// The device associated with the stream is no longer available.
#[fail(display = "the device associated with the stream is no longer available")]
#[error("the device associated with the stream is no longer available")]
DeviceNotAvailable,
/// See the `BackendSpecificError` docs for more information about this error variant.
#[fail(display = "{}", err)]
#[error("{err}")]
BackendSpecific {
#[fail(cause)]
#[from]
err: BackendSpecificError,
},
}
@ -139,80 +133,30 @@ pub enum PlayStreamError {
/// As of writing this, only macOS may immediately return an error while calling this method. This
/// is because both the alsa and wasapi backends only enqueue these commands and do not process
/// them immediately.
#[derive(Debug, Fail)]
#[derive(Debug, Error)]
pub enum PauseStreamError {
/// The device associated with the stream is no longer available.
#[fail(display = "the device associated with the stream is no longer available")]
#[error("the device associated with the stream is no longer available")]
DeviceNotAvailable,
/// See the `BackendSpecificError` docs for more information about this error variant.
#[fail(display = "{}", err)]
#[error("{err}")]
BackendSpecific {
#[fail(cause)]
#[from]
err: BackendSpecificError,
},
}
/// Errors that might occur while a stream is running.
#[derive(Debug, Fail)]
#[derive(Debug, Error)]
pub enum StreamError {
/// The device no longer exists. This can happen if the device is disconnected while the
/// program is running.
#[fail(
display = "The requested device is no longer available. For example, it has been unplugged."
)]
#[error("The requested device is no longer available. For example, it has been unplugged.")]
DeviceNotAvailable,
/// See the `BackendSpecificError` docs for more information about this error variant.
#[fail(display = "{}", err)]
#[error("{err}")]
BackendSpecific {
#[fail(cause)]
#[from]
err: BackendSpecificError,
},
}
impl From<BackendSpecificError> for DevicesError {
fn from(err: BackendSpecificError) -> Self {
DevicesError::BackendSpecific { err }
}
}
impl From<BackendSpecificError> for DeviceNameError {
fn from(err: BackendSpecificError) -> Self {
DeviceNameError::BackendSpecific { err }
}
}
impl From<BackendSpecificError> for SupportedFormatsError {
fn from(err: BackendSpecificError) -> Self {
SupportedFormatsError::BackendSpecific { err }
}
}
impl From<BackendSpecificError> for DefaultFormatError {
fn from(err: BackendSpecificError) -> Self {
DefaultFormatError::BackendSpecific { err }
}
}
impl From<BackendSpecificError> for BuildStreamError {
fn from(err: BackendSpecificError) -> Self {
BuildStreamError::BackendSpecific { err }
}
}
impl From<BackendSpecificError> for PlayStreamError {
fn from(err: BackendSpecificError) -> Self {
PlayStreamError::BackendSpecific { err }
}
}
impl From<BackendSpecificError> for PauseStreamError {
fn from(err: BackendSpecificError) -> Self {
PauseStreamError::BackendSpecific { err }
}
}
impl From<BackendSpecificError> for StreamError {
fn from(err: BackendSpecificError) -> Self {
StreamError::BackendSpecific { err }
}
}

2
src/lib.rs
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@ -140,7 +140,6 @@
#![recursion_limit = "512"]
extern crate failure;
#[cfg(target_os = "windows")]
#[macro_use]
extern crate lazy_static;
@ -148,6 +147,7 @@ extern crate lazy_static;
#[cfg(target_os = "emscripten")]
#[macro_use]
extern crate stdweb;
extern crate thiserror;
pub use error::*;
pub use platform::{