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[tools.rs] Subject: [pbs-devel] [RFC backup 1/2] implement an api_string_type helper macro X-BeenThere: pbs-devel@lists.proxmox.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: Proxmox Backup Server development discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 04 May 2021 10:19:32 -0000 Signed-off-by: Wolfgang Bumiller --- src/tools.rs | 3 + src/tools/api_string_type.rs | 105 +++++++++++++++++++++++++++++++++++ 2 files changed, 108 insertions(+) create mode 100644 src/tools/api_string_type.rs diff --git a/src/tools.rs b/src/tools.rs index c58569a6..98597c29 100644 --- a/src/tools.rs +++ b/src/tools.rs @@ -18,6 +18,9 @@ use percent_encoding::{utf8_percent_encode, AsciiSet}; pub use proxmox::tools::fd::Fd; use proxmox::tools::fs::{create_path, CreateOptions}; +#[macro_use] +pub mod api_string_type; + pub mod acl; pub mod apt; pub mod async_io; diff --git a/src/tools/api_string_type.rs b/src/tools/api_string_type.rs new file mode 100644 index 00000000..122fcbed --- /dev/null +++ b/src/tools/api_string_type.rs @@ -0,0 +1,105 @@ +/// Helper macro to generate a simple string type wrapper. +/// +/// This is meant to be used with an API-type tuple struct containing a single `String` like this: +/// +/// ```ignore +/// api_string_type! { +/// #[api(format: &PROXMOX_SAFE_ID_FORMAT)] +/// /// ACME account name. +/// #[derive(Clone, Eq, PartialEq, Hash, Deserialize, Serialize)] +/// #[serde(transparent)] +/// pub struct AccountName(String); +/// } +/// ``` +/// +/// This will automatically implements: +/// * `Display` as a pass-through to `String`'s `Display` +/// * `Debug` as a pass-through to `String`'s `Debug` +/// * `Deref` +/// * `DerefMut` +/// * `AsRef` +/// * `fn into_string(self) -> String` +/// * `fn as_str(&self) -> &str` +/// * `fn from_string(inner: String) -> Result` using +/// `StringSchema::check_constraints`. +/// * `unsafe fn from_string_unchecked(inner: String) -> Self` +macro_rules! api_string_type { + ( + $(#[$doc:meta])* + $vis:vis struct $name:ident(String); + ) => ( + $(#[$doc])* + $vis struct $name(String); + + impl ::std::ops::Deref for $name { + type Target = str; + + #[inline] + fn deref(&self) -> &str { + &self.0 + } + } + + impl ::std::ops::DerefMut for $name { + #[inline] + fn deref_mut(&mut self) -> &mut str { + &mut self.0 + } + } + + impl AsRef for $name { + #[inline] + fn as_ref(&self) -> &str { + self.0.as_ref() + } + } + + impl $name { + /// Get the contained string. + pub fn into_string(self) -> String { + self.0 + } + + /// Get the string as slice. + pub fn as_str(&self) -> &str { + self.0.as_str() + } + + /// Create an instance directly from a `String`. + /// + /// # Safety + /// + /// It is the caller's job to have validated the contents. + /// While there are no memory safety issues, a wrong string can cause API calls to + /// fail parameter validation. + pub unsafe fn from_string_unchecked(name: String) -> Self { + Self(name) + } + + /// Create an instance directly from a `String`, validating it using the API schema's + /// [`check_constraints`](::proxmox::api::schema::StringSchema::check_constraints()) + /// method. + pub fn from_string(inner: String) -> Result { + match &Self::API_SCHEMA { + ::proxmox::api::schema::Schema::String(s) => s.check_constraints(&inner)?, + _ => unreachable!(), + } + Ok(Self(inner)) + } + } + + impl ::std::fmt::Debug for $name { + #[inline] + fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result { + ::std::fmt::Debug::fmt(&self.0, f) + } + } + + impl ::std::fmt::Display for $name { + #[inline] + fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result { + ::std::fmt::Display::fmt(&self.0, f) + } + } + ); +} -- 2.20.1