Added UsbDescriptor, added get_device_list() on native, updated deps

src/backend/native.rs

@@ -1,7 +1,13 @@
-use crate::usb::{ControlIn, ControlOut, ControlType, Device, Interface, Recipient, UsbError};
+use crate::usb::{
+    ControlIn, ControlOut, ControlType, Descriptor, Device, Interface, Recipient, UsbError,
+};
+
+pub struct UsbDescriptor {
+    device_info: nusb::DeviceInfo,
+}
 
 pub struct UsbDevice {
-    device_info: nusb::DeviceInfo,
+    device_info: UsbDescriptor,
     device: nusb::Device,
 }
 
@@ -36,15 +42,13 @@ impl DeviceFilter {
     }
 }
 
-pub async fn get_device(device_filter: Vec<DeviceFilter>) -> Result<UsbDevice, UsbError> {
+pub async fn get_device(device_filters: Vec<DeviceFilter>) -> Result<UsbDescriptor, UsbError> {
     let devices = nusb::list_devices().unwrap();
 
     let mut device_info = None;
     for prelim_dev_inf in devices {
         // See if the device exists in the list
-        if device_filter
-            .iter()
-            .any(|info| {
+        if device_filters.iter().any(|info| {
             let mut result = false;
 
             if info.vendor_id.is_some() {
@@ -68,10 +72,9 @@ pub async fn get_device(device_filter: Vec<DeviceFilter>) -> Result<UsbDevice, U
             }
 
             result
-            })
-        {
+        }) {
             device_info = Some(prelim_dev_inf);
-            break
+            break;
         }
     }
 
@@ -80,39 +83,69 @@ pub async fn get_device(device_filter: Vec<DeviceFilter>) -> Result<UsbDevice, U
         None => return Err(UsbError::DeviceNotFound),
     };
 
-    let device = match device_info.open() {
-        Ok(dev) => dev,
-        Err(_) => return Err(UsbError::CommunicationError),
-    };
-
-    Ok(UsbDevice {
-        device_info,
-        device,
-    })
+    Ok(UsbDescriptor { device_info })
 }
 
-impl Device for UsbDevice {
-    type UsbDevice = UsbDevice;
-    type UsbInterface = UsbInterface;
+pub async fn get_device_list(
+    device_filters: Vec<DeviceFilter>,
+) -> Result<Vec<UsbDescriptor>, UsbError> {
+    let devices_info = nusb::list_devices().unwrap();
 
-    async fn open_interface(&self, number: u8) -> Result<UsbInterface, UsbError> {
-        let interface = match self.device.claim_interface(number) {
-            Ok(inter) => inter,
-            Err(_) => return Err(UsbError::CommunicationError),
-        };
+    let mut devices = Vec::new();
+    for prelim_dev_inf in devices_info {
+        // See if the device exists in the list
+        if device_filters.iter().any(|info| {
+            let mut result = false;
 
-        Ok(UsbInterface { interface })
+            if info.vendor_id.is_some() {
+                result = info.vendor_id.unwrap() == prelim_dev_inf.vendor_id();
             }
 
-    async fn reset(&self) -> Result<(), UsbError> {
-        match self.device.reset() {
-            Ok(_) => Ok(()),
-            Err(_) => Err(UsbError::CommunicationError),
+            if info.product_id.is_some() {
+                result = info.product_id.unwrap() == prelim_dev_inf.product_id();
+            }
+
+            if info.class.is_some() {
+                result = info.class.unwrap() == prelim_dev_inf.class();
+            }
+
+            if info.subclass.is_some() {
+                result = info.subclass.unwrap() == prelim_dev_inf.subclass();
+            }
+
+            if info.protocol.is_some() {
+                result = info.protocol.unwrap() == prelim_dev_inf.protocol();
+            }
+
+            result
+        }) {
+            devices.push(prelim_dev_inf);
         }
     }
 
-    async fn forget(&self) -> Result<(), UsbError> {
-        self.reset().await
+    if devices.is_empty() {
+        return Err(UsbError::DeviceNotFound);
+    }
+
+    let devices_opened: Vec<UsbDescriptor> = devices
+        .into_iter()
+        .map(|d| UsbDescriptor { device_info: d })
+        .collect();
+
+    Ok(devices_opened)
+}
+
+impl Descriptor for UsbDescriptor {
+    type Device = UsbDevice;
+
+    async fn open(self) -> Result<Self::Device, UsbError> {
+        match self.device_info.open() {
+            Ok(dev) => Ok(Self::Device {
+                device_info: self,
+                device: dev,
+            }),
+            Err(err) => Err(UsbError::CommunicationError(err.to_string())),
+        }
     }
 
     async fn vendor_id(&self) -> u16 {
@@ -140,6 +173,69 @@ impl Device for UsbDevice {
     }
 }
 
+impl Device for UsbDevice {
+    type Interface = UsbInterface;
+
+    async fn open_interface(&self, number: u8) -> Result<Self::Interface, UsbError> {
+        let interface = match self.device.claim_interface(number) {
+            Ok(inter) => inter,
+            Err(err) => return Err(UsbError::CommunicationError(err.to_string())),
+        };
+
+        Ok(UsbInterface { interface })
+    }
+
+    async fn detach_and_open_interface(&self, number: u8) -> Result<Self::Interface, UsbError> {
+        let interface = match self.device.detach_and_claim_interface(number) {
+            Ok(inter) => inter,
+            Err(err) => return Err(UsbError::CommunicationError(err.to_string())),
+        };
+
+        Ok(UsbInterface { interface })
+    }
+
+    async fn reset(&self) -> Result<(), UsbError> {
+        match self.device.reset() {
+            Ok(_) => Ok(()),
+            Err(err) => Err(UsbError::CommunicationError(err.to_string())),
+        }
+    }
+
+    async fn forget(&self) -> Result<(), UsbError> {
+        self.reset().await
+    }
+
+    async fn product_id(&self) -> u16 {
+        self.device_info.product_id().await
+    }
+
+    async fn vendor_id(&self) -> u16 {
+        self.device_info.vendor_id().await
+    }
+
+    async fn class(&self) -> u8 {
+        self.device_info.class().await
+    }
+
+    async fn subclass(&self) -> u8 {
+        self.device_info.subclass().await
+    }
+
+    async fn manufacturer_string(&self) -> Option<String> {
+        self.device_info.manufacturer_string().await
+    }
+
+    async fn product_string(&self) -> Option<String> {
+        self.device_info.product_string().await
+    }
+}
+
+impl Drop for UsbDevice {
+    fn drop(&mut self) {
+        let _ = self.device.reset();
+    }
+}
+
 impl<'a> Interface<'a> for UsbInterface {
     async fn control_in(&self, data: ControlIn) -> Result<Vec<u8>, UsbError> {
         let result = match self.interface.control_in(data.into()).await.into_result() {

src/backend/wasm.rs

@@ -1,4 +1,4 @@
-#![cfg_attr(debug_assertions, allow(dead_code, unused_imports))]
+//#![cfg_attr(debug_assertions, allow(dead_code, unused_imports))]
 use wasm_bindgen::prelude::*;
 
 use js_sys::{Array, Object, Promise, Uint8Array};
@@ -9,7 +9,12 @@ use web_sys::{
 };
 
 // Crate stuff
-use crate::usb::{ControlIn, ControlOut, ControlType, Device, Interface, Recipient, UsbError};
+use crate::usb::{ControlIn, ControlOut, ControlType, Device, Interface, Recipient, UsbError, Descriptor};
+
+#[wasm_bindgen]
+pub struct UsbDescriptor {
+    device: WasmUsbDevice,
+}
 
 #[wasm_bindgen]
 pub struct UsbDevice {
@@ -51,9 +56,7 @@ impl DeviceFilter {
 }
 
 #[wasm_bindgen]
-pub async fn get_device(
-    device_filter: Vec<DeviceFilter>,
-) -> Result<UsbDevice, js_sys::Error> {
+pub async fn get_device(device_filter: Vec<DeviceFilter>) -> Result<UsbDescriptor, js_sys::Error> {
     let window = web_sys::window().unwrap();
 
     let navigator = window.navigator();
@@ -68,9 +71,7 @@ pub async fn get_device(
     for js_device in device_list {
         let device: WasmUsbDevice = js_device.into();
 
-        if device_filter
-            .iter()
-            .any(|info| {
+        if device_filter.iter().any(|info| {
             let mut result = false;
 
             if info.vendor_id.is_some() {
@@ -94,10 +95,9 @@ pub async fn get_device(
             }
 
             result
-            })
-        {
+        }) {
             let _open_promise = JsFuture::from(Promise::resolve(&device.open())).await?;
-            return Ok(UsbDevice { device });
+            return Ok(UsbDescriptor { device });
         }
     }
 
@@ -156,12 +156,154 @@ pub async fn get_device(
 
     let _open_promise = JsFuture::from(Promise::resolve(&device.open())).await?;
 
-    Ok(UsbDevice { device })
+    Ok(UsbDescriptor { device })
+}
+
+/*
+#[wasm_bindgen]
+pub async fn get_device_list(device_filter: Vec<DeviceFilter>) -> Result<Vec<UsbDescriptor>, js_sys::Error> {
+    let window = web_sys::window().unwrap();
+
+    let navigator = window.navigator();
+    let usb = navigator.usb();
+
+    let device_list: Array = match JsFuture::from(Promise::resolve(&usb.get_devices())).await {
+        Ok(list) => list.into(),
+        Err(_) => Array::new(),
+    };
+
+    let mut devices = Vec::new();
+    // Check if the device is already paired, if so, we don't need to request it again
+    for js_device in device_list {
+        let device: WasmUsbDevice = js_device.into();
+
+        if device_filter.iter().any(|info| {
+            let mut result = false;
+
+            if info.vendor_id.is_some() {
+                result = info.vendor_id.unwrap() == device.vendor_id();
+            }
+
+            if info.product_id.is_some() {
+                result = info.product_id.unwrap() == device.product_id();
+            }
+
+            if info.class.is_some() {
+                result = info.class.unwrap() == device.device_class();
+            }
+
+            if info.subclass.is_some() {
+                result = info.subclass.unwrap() == device.device_subclass();
+            }
+
+            if info.protocol.is_some() {
+                result = info.protocol.unwrap() == device.device_protocol();
+            }
+
+            result
+        }) {
+            let _open_promise = JsFuture::from(Promise::resolve(&device.open())).await?;
+            devices.push(UsbDescriptor { device });
+        }
+    }
+
+    let arr = Array::new();
+    for filter in device_filter {
+        let js_filter = js_sys::Object::new();
+        if let Some(vid) = filter.vendor_id {
+            js_sys::Reflect::set(
+                &js_filter,
+                &JsValue::from_str("vendorId"),
+                &JsValue::from(vid),
+            )
+            .unwrap();
+        }
+        if let Some(pid) = filter.product_id {
+            js_sys::Reflect::set(
+                &js_filter,
+                &JsValue::from_str("productId"),
+                &JsValue::from(pid),
+            )
+            .unwrap();
+        }
+        if let Some(class) = filter.class {
+            js_sys::Reflect::set(
+                &js_filter,
+                &JsValue::from_str("classCode"),
+                &JsValue::from(class),
+            )
+            .unwrap();
+        }
+        if let Some(subclass) = filter.subclass {
+            js_sys::Reflect::set(
+                &js_filter,
+                &JsValue::from_str("subclassCode"),
+                &JsValue::from(subclass),
+            )
+            .unwrap();
+        }
+        if let Some(pro) = filter.protocol {
+            js_sys::Reflect::set(
+                &js_filter,
+                &JsValue::from_str("protocolCode"),
+                &JsValue::from(pro),
+            )
+            .unwrap();
+        }
+        arr.push(&js_filter);
+    }
+
+    let filters = JsValue::from(&arr);
+    let filters2 = UsbDeviceRequestOptions::new(&filters);
+
+    let device: WasmUsbDevice = JsFuture::from(Promise::resolve(&usb.request_device(&filters2)))
+        .await?
+        .into();
+
+    let _open_promise = JsFuture::from(Promise::resolve(&device.open())).await?;
+
+    devices.push(UsbDescriptor { device });
+
+    return Ok(devices);
+}
+*/
+
+impl Descriptor for UsbDescriptor {
+    type Device = UsbDevice;
+
+    async fn open(self) -> Result<Self::Device, UsbError> {
+        Ok(Self::Device {
+            device: self.device
+        })
+    }
+
+    async fn product_id(&self) -> u16 {
+        self.device.vendor_id()
+    }
+
+    async fn vendor_id(&self) -> u16 {
+        self.device.product_id()
+    }
+
+    async fn class(&self) -> u8 {
+        self.device.device_class()
+    }
+
+    async fn subclass(&self) -> u8 {
+        self.device.device_subclass()
+    }
+
+    async fn manufacturer_string(&self) -> Option<String> {
+        self.device.manufacturer_name()
+    }
+
+    async fn product_string(&self) -> Option<String> {
+        self.device.product_name()
+    }
 }
 
 impl Device for UsbDevice {
-    type UsbDevice = UsbDevice;
-    type UsbInterface = UsbInterface;
+    type Interface = UsbInterface;
 
     async fn open_interface(&self, number: u8) -> Result<UsbInterface, UsbError> {
         let dev_promise =
@@ -170,8 +312,8 @@ impl Device for UsbDevice {
         // Wait for the interface to be claimed
         let _device: WasmUsbDevice = match dev_promise {
             Ok(dev) => dev.into(),
-            Err(_) => {
-                return Err(UsbError::CommunicationError);
+            Err(err) => {
+                return Err(UsbError::CommunicationError(err.as_string().unwrap_or_default()));
             }
         };
 
@@ -181,12 +323,16 @@ impl Device for UsbDevice {
         })
     }
 
+    async fn detach_and_open_interface(&self, number: u8) -> Result<Self::Interface, UsbError> {
+        self.open_interface(number).await
+    }
+
     async fn reset(&self) -> Result<(), UsbError> {
         let result = JsFuture::from(Promise::resolve(&self.device.reset())).await;
 
         match result {
             Ok(_) => Ok(()),
-            Err(_) => Err(UsbError::CommunicationError),
+            Err(err) => Err(UsbError::CommunicationError(err.as_string().unwrap_or_default())),
         }
     }
 
@@ -195,7 +341,7 @@ impl Device for UsbDevice {
 
         match result {
             Ok(_) => Ok(()),
-            Err(_) => Err(UsbError::CommunicationError),
+            Err(err) => Err(UsbError::CommunicationError(err.as_string().unwrap_or_default())),
         }
     }
 

src/lib.rs

@@ -9,24 +9,34 @@
 //!
 //! When a [UsbInterface] is dropped, it is automatically released.
 //!
+//! ### CURRENT LIMITATIONS:
+//! * Hotplug support is not implemented. Waiting on [hotplug support in nusb](https://github.com/kevinmehall/nusb/pull/20).
+//!
+//! * Until [this pull request](https://github.com/rustwasm/wasm-bindgen/issues/3155)
+//! is merged into wasm bindgen, getting a list of USB devices is not possible on WASM
+//! targets. However, this isn't a huge deal as the user gets a list to select from anyway.
+//!
 //! ## Example:
 //! ```no_run
 //! # tokio_test::block_on(async {
-//! use cross_usb::usb::{Device, Interface, Recipient, ControlType, ControlIn};
+//! use cross_usb::usb::{Descriptor, Device, Interface, Recipient, ControlType, ControlIn};
 //! use cross_usb::device_filter;
 //!
-//! // Obtain a device using its VendorID and ProductID
-//! let filter = vec![
+//! // Obtain a device descriptor (UsbDescriptor) using a DeviceFilter,
+//! // in this case with its VendorID and ProductID
+//! let filters = vec![
 //!     device_filter!{vendor_id: 0x054c, product_id: 0x00c9}
 //! ];
+//! let dev_descriptor = cross_usb::get_device(filters).await.expect("Failed to find device");
 //!
-//! let device = cross_usb::get_device(filter).await.expect("Failed to get device");
+//! // Open the device that the descriptor is describing
+//! let dev = dev_descriptor.open().await.expect("Failed to open device");
 //!
 //! // Obtain an interface of the device
-//! let interface = device.open_interface(0).await.expect("Failed to open interface");
+//! let interface = dev.open_interface(0).await.expect("Failed to open interface");
 //!
 //! // Send a Control transfer to the device, obtaining
-//! // the result and storing it in `result`, and you're done!
+//! // the result and storing it in `result`
 //! let result = interface.control_in(ControlIn {
 //!         control_type: ControlType::Vendor,
 //!         recipient: Recipient::Interface,
@@ -41,16 +51,19 @@
 //! ```
 pub mod usb;
 
+/// The context contains the platform specific implementation of the USB transfers
 #[cfg(not(target_family = "wasm"))]
 #[path = "./backend/native.rs"]
-/// The context contains the platform specific implementation of the USB transfers
 mod context;
 
 #[cfg(target_family = "wasm")]
 #[path = "./backend/wasm.rs"]
-/// The context contains the platform specific implementation of the USB transfers
 mod context;
 
+#[doc(inline)]
+/// An implementation of a USB device descriptor
+pub use crate::context::UsbDescriptor;
+
 #[doc(inline)]
 /// An implementation of a USB device
 pub use crate::context::UsbDevice;
@@ -64,14 +77,13 @@ pub use crate::context::UsbInterface;
 #[doc(inline)]
 pub use crate::context::DeviceFilter;
 
-/// Gets a single device from a list of VendorID and ProductIDs
+/// Gets a single device descriptor ([UsbDescriptor]) from a list of VendorID and ProductIDs
 ///
 /// ## Example
 /// ```no_run
 /// # tokio_test::block_on(async {
 /// use cross_usb::{get_device, DeviceFilter, device_filter};
 ///
-///
 /// let filter = vec![
 ///     device_filter!{vendor_id: 0x054c, product_id: 0x00c9},
 ///     device_filter!{vendor_id: 0x054c},
@@ -83,6 +95,11 @@ pub use crate::context::DeviceFilter;
 #[doc(inline)]
 pub use crate::context::get_device;
 
+/// Gets a list of devices from a list of VendorID and ProductIDs
+#[cfg(not(target_family = "wasm"))]
+#[doc(inline)]
+pub use crate::context::get_device_list;
+
 /// Macro to create a device filter more easily.
 ///
 /// The only valid keys are fields of the [DeviceFilter] struct.

src/usb.rs

@@ -2,19 +2,49 @@
 //! This module contains the traits and associated functions and
 //! structs which allow for USB communication.
 
-use crate::context::UsbInterface;
 use thiserror::Error;
 
+pub trait Descriptor {
+    /// A unique USB Device
+    type Device;
+
+    /// Opens the USB connection, returning a [Self::Device]
+    async fn open(self) -> Result<Self::Device, UsbError>;
+
+    /// 16 bit device Product ID
+    async fn product_id(&self) -> u16;
+
+    /// 16 bit device Vendor ID
+    async fn vendor_id(&self) -> u16;
+
+    /// Device standard class
+    async fn class(&self) -> u8;
+
+    /// Device standard subclass
+    async fn subclass(&self) -> u8;
+
+    /// Get the manufacturer string string of the device, if available without device IO
+    ///
+    /// Not available on Windows
+    async fn manufacturer_string(&self) -> Option<String>;
+
+    /// Get the product string of the device, if available without device IO
+    async fn product_string(&self) -> Option<String>;
+}
+
 /// A unique USB device
 pub trait Device {
-    /// A unique USB Device
-    type UsbDevice;
-
     /// A unique Interface on a USB Device
-    type UsbInterface;
+    type Interface;
 
     /// Open a specific interface of the device
-    async fn open_interface(&self, number: u8) -> Result<UsbInterface, UsbError>;
+    async fn open_interface(&self, number: u8) -> Result<Self::Interface, UsbError>;
+
+    /// Open a specific interface of the device, detaching any
+    /// kernel drivers and claiming it.
+    ///
+    /// **Note:** This only has an effect on Native, and only on Linux.
+    async fn detach_and_open_interface(&self, number: u8) -> Result<Self::Interface, UsbError>;
 
     /// Reset the device, which causes it to no longer be usable. You must
     /// request a new device with [crate::get_device]
@@ -22,7 +52,7 @@ pub trait Device {
 
     /// Remove the device from the paired devices list, causing it to no longer be usable. You must request to reconnect using [crate::get_device]
     ///
-    /// **Note: on Native with `nusb` this simply resets the device**
+    /// **Note:** On Native this simply resets the device.
     async fn forget(&self) -> Result<(), UsbError>;
 
     /// 16 bit device Product ID
@@ -87,7 +117,7 @@ pub enum UsbError {
     TransferError,
 
     #[error("device communication failed")]
-    CommunicationError,
+    CommunicationError(String),
 
     #[error("device disconnected")]
     Disconnected,