diff options
Diffstat (limited to 'src/lib.rs')
| -rw-r--r-- | src/lib.rs | 66 |
1 files changed, 66 insertions, 0 deletions
@@ -89,6 +89,9 @@ #![warn(missing_docs, rust_2018_compatibility, rust_2018_idioms, unused)] +#[macro_use(lazy_static)] +extern crate lazy_static; + mod auth; mod config; mod device; @@ -98,6 +101,8 @@ mod pws; mod util; use std::fmt; +use std::marker; +use std::sync; use nitrokey_sys; @@ -117,6 +122,10 @@ pub const DEFAULT_ADMIN_PIN: &str = "12345678"; /// The default user PIN for all Nitrokey devices. pub const DEFAULT_USER_PIN: &str = "123456"; +lazy_static! { + static ref MANAGER: sync::Mutex<Manager> = sync::Mutex::new(Manager::new()); +} + /// A version of the libnitrokey library. /// /// Use the [`get_library_version`](fn.get_library_version.html) function to query the library @@ -147,6 +156,63 @@ impl fmt::Display for Version { } } +/// A manager for connections to Nitrokey devices. +/// +/// Currently, libnitrokey only provides access to one Nitrokey device at the same time. This +/// manager struct makes sure that `nitrokey-rs` does not try to connect to two devices at the same +/// time. +/// +/// To obtain an instance of this manager, use the [`take`][] function. +/// +/// [`take`]: fn.take.html +#[derive(Debug)] +pub struct Manager { + marker: marker::PhantomData<()>, +} + +impl Manager { + fn new() -> Self { + Manager { + marker: marker::PhantomData, + } + } +} + +/// Take an instance of the connection manager, blocking until an instance is available. +/// +/// There may only be one [`Manager`][] instance at the same time. If there already is an +/// instance, this method blocks. If you want a non-blocking version, use [`take`][]. +/// +/// # Errors +/// +/// - [`PoisonError`][] if the lock is poisoned +/// +/// [`take`]: fn.take.html +/// [`PoisonError`]: struct.Error.html#variant.PoisonError +/// [`Manager`]: struct.Manager.html +pub fn take_blocking() -> Result<sync::MutexGuard<'static, Manager>, Error> { + MANAGER.lock().map_err(Into::into) +} + +/// Try to take an instance of the connection manager. +/// +/// There may only be one [`Manager`][] instance at the same time. If there already is an +/// instance, a [`ConcurrentAccessError`][] is returned. If you want a blocking version, use +/// [`take_blocking`][]. +/// +/// # Errors +/// +/// - [`ConcurrentAccessError`][] if the token for the `Manager` instance cannot be locked +/// - [`PoisonError`][] if the lock is poisoned +/// +/// [`take_blocking`]: fn.take_blocking.html +/// [`ConcurrentAccessError`]: struct.Error.html#variant.ConcurrentAccessError +/// [`PoisonError`]: struct.Error.html#variant.PoisonError +/// [`Manager`]: struct.Manager.html +pub fn take() -> Result<sync::MutexGuard<'static, Manager>, Error> { + MANAGER.try_lock().map_err(Into::into) +} + /// Enables or disables debug output. Calling this method with `true` is equivalent to setting the /// log level to `Debug`; calling it with `false` is equivalent to the log level `Error` (see /// [`set_log_level`][]). |