Crate openssl_errors

Custom error library support for the openssl crate.

OpenSSL allows third-party libraries to integrate with its error API. This crate provides a safe interface to that.

Examples

use openssl_errors::{openssl_errors, put_error};
use openssl::error::Error;

// Errors are organized at the top level into "libraries". The
// openssl_errors! macro can define these.
//
// Libraries contain a set of functions and reasons. The library itself,
// its functions, and its definitions all all have an associated message
// string. This string is what's shown in OpenSSL errors.
//
// The macro creates a type for each library with associated constants for
// its functions and reasons.
openssl_errors! {
    pub library MyLib("my cool library") {
        functions {
            FIND_PRIVATE_KEY("find_private_key");
        }

        reasons {
            IO_ERROR("IO error");
            BAD_PASSWORD("invalid private key password");
        }
    }
}

// The put_error! macro pushes errors onto the OpenSSL error stack.
put_error!(MyLib::FIND_PRIVATE_KEY, MyLib::BAD_PASSWORD);

// Prints `error:80001002:my cool library:find_private_key:invalid private key password:src/lib.rs:27:`
println!("{}", Error::get().unwrap());

// You can also optionally attach an extra string of context using the
// standard Rust format syntax.
let tries = 2;
put_error!(MyLib::FIND_PRIVATE_KEY, MyLib::IO_ERROR, "tried {} times", tries);

// Prints `error:80001001:my cool library:find_private_key:IO error:src/lib.rs:34:tried 2 times`
println!("{}", Error::get().unwrap());

Macros

openssl_errors	Defines custom OpenSSL error libraries.
put_error	Pushes an error onto the OpenSSL error stack.

Structs

Function	A function declaration, parameterized by its error library.
Reason	A reason declaration, parameterized by its error library.

Traits

Library

An OpenSSL error library.