76 lines
2.2 KiB
Rust
76 lines
2.2 KiB
Rust
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//! This module defines custom error types using the `failure`-crate.
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//! Links to foreign error types (such as database connection errors)
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//! are established in a similar way as was tradition in
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//! `error_chain`, albeit manually.
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use std::result;
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use actix_web::{ResponseError, HttpResponse};
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use actix_web::http::StatusCode;
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// Modules with foreign errors:
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use actix;
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use diesel;
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use r2d2;
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use tera;
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pub type Result<T> = result::Result<T, ConverseError>;
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#[derive(Debug, Fail)]
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pub enum ConverseError {
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#[fail(display = "an internal Converse error occured: {}", reason)]
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InternalError { reason: String },
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#[fail(display = "a database error occured: {}", error)]
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Database { error: diesel::result::Error },
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#[fail(display = "a database connection pool error occured: {}", error)]
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ConnectionPool { error: r2d2::Error },
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#[fail(display = "a template rendering error occured: {}", reason)]
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Template { reason: String },
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// This variant is used as a catch-all for wrapping
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// actix-web-compatible response errors, such as the errors it
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// throws itself.
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#[fail(display = "Actix response error: {}", error)]
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ActixWeb { error: Box<ResponseError> },
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}
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// Establish conversion links to foreign errors:
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impl From<diesel::result::Error> for ConverseError {
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fn from(error: diesel::result::Error) -> ConverseError {
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ConverseError::Database { error }
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}
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}
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impl From<r2d2::Error> for ConverseError {
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fn from(error: r2d2::Error) -> ConverseError {
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ConverseError::ConnectionPool { error }
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}
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}
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impl From<tera::Error> for ConverseError {
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fn from(error: tera::Error) -> ConverseError {
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ConverseError::Template {
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reason: format!("{}", error),
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}
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}
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}
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impl From<actix::MailboxError> for ConverseError {
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fn from(error: actix::MailboxError) -> ConverseError {
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ConverseError::ActixWeb { error: Box::new(error) }
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}
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}
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// Support conversion of error type into HTTP error responses:
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impl ResponseError for ConverseError {
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fn error_response(&self) -> HttpResponse {
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// Everything is mapped to internal server errors for now.
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HttpResponse::build(StatusCode::INTERNAL_SERVER_ERROR)
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.body(format!("An error occured: {}", self))
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}
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}
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