Struct libherokubuildpack::HerokuBuildpackErrorHandler

pub struct HerokuBuildpackErrorHandler<E> { /* fields omitted */ }

A shared libcnb ErrorHandler for Heroku buildpacks

It outputs generic libcnb errors in a consistent style using the logging functions from this create. Buildpack specific errors are handled by a custom handler.

Implementations

impl<E> HerokuBuildpackErrorHandler<E>

pub fn new(buildpack_error_handler: Box<dyn Fn(E) -> i32>) -> Self

Constructs a new HerokuBuildpackErrorHandler with the given error handler for custom buildpack errors.

Example:

use libherokubuildpack::{HerokuBuildpackErrorHandler, log_error};

enum FooBuildpackError {
    CannotExecuteFooBuildTool(std::io::Error),
    InvalidFooDescriptorToml
}

fn handle_foo_buildpack_error(e: FooBuildpackError) -> i32 {
    match e {
        FooBuildpackError::InvalidFooDescriptorToml => {
            log_error("Invalid foo.toml", "Your app's foo.toml is invalid!");
            23
        },
        FooBuildpackError::CannotExecuteFooBuildTool(inner) => {
            log_error("Cannot execute foo buildtool", format!("Cause: {}", &inner));
            42
        }
    }
}

let libcnb_error_handler
    = HerokuBuildpackErrorHandler::new(Box::new(handle_foo_buildpack_error));

Trait Implementations

impl<E: Debug + Display> ErrorHandler<E> for HerokuBuildpackErrorHandler<E>

fn handle_error(&self, error: Error<E>) -> i32