example_html_error_handler

Introduced classes

class HtmlErrorHandler

popcorn :: HtmlErrorHandler

class HtmlErrorTemplate

popcorn :: HtmlErrorTemplate

Redefined classes

redef class Sys

popcorn :: example_html_error_handler $ Sys

The main class of the program.

All class definitions

class HtmlErrorHandler

popcorn $ HtmlErrorHandler

class HtmlErrorTemplate

popcorn $ HtmlErrorTemplate

redef class Sys

popcorn :: example_html_error_handler $ Sys

The main class of the program.

Ancestors

module abstract_collection

core :: abstract_collection

Abstract collection classes and services.

module abstract_text

core :: abstract_text

Abstract class for manipulation of sequences of characters

module array

This module introduces the standard array structure.

module base64

base64 :: base64

Offers the base 64 encoding and decoding algorithms

module bitset

Services to handle BitSet

module bytes

Services for byte streams and arrays

module caching

serialization :: caching

Services for caching serialization engines

module circular_array

core :: circular_array

Efficient data structure to access both end of the sequence.

module codec_base

core :: codec_base

Base for codecs to use with streams

module codecs

Group module for all codec-related manipulations

module collection

core :: collection

This module define several collection classes.

module console

console :: console

Defines some ANSI Terminal Control Escape Sequences.

module core

Standard classes and methods used by default by Nit programs and libraries.

module csv

CSV document handling.

module engine_tools

serialization :: engine_tools

Advanced services for serialization engines

module environ

core :: environ

Access to the environment variables of the process

module error

Standard error-management infrastructure.

module exec

Invocation and management of operating system sub-processes.

module file

File manipulations (create, read, write, etc.)

module file_server

nitcorn :: file_server

Provides the FileServer action, which is a standard and minimal file server

module fixed_ints

core :: fixed_ints

Basic integers of fixed-precision

module fixed_ints_text

core :: fixed_ints_text

Text services to complement fixed_ints

module flat

All the array-based text representations

module gc

Access to the Nit internal garbage collection mechanism

module hash_collection

core :: hash_collection

Introduce HashMap and HashSet.

module http_errors

nitcorn :: http_errors

Offers ErrorTemplate to display error pages

module http_request

nitcorn :: http_request

Provides the HttpRequest class and services to create it

module http_request_buffer

nitcorn :: http_request_buffer

Http request parsing for buffered inputs.

module http_response

nitcorn :: http_response

Provides the HttpResponse class and http_status_codes

module inspect

serialization :: inspect

Refine Serializable::inspect to show more useful information

module iso8859_1

core :: iso8859_1

Codec for ISO8859-1 I/O

module kernel

Most basic classes and methods.

module libevent

libevent :: libevent

Low-level wrapper around the libevent library to manage events on file descriptors

module list

This module handle double linked lists

module logger

logger :: logger

A simple logger for Nit

module math

Mathematical operations

module md5

Native MD5 digest implementation as Text::md5

module media_types

nitcorn :: media_types

Services to identify Internet media types (or MIME types, Content-types)

module meta

Simple user-defined meta-level to manipulate types of instances as object.

module more_collections

more_collections :: more_collections

Highly specific, but useful, collections-related classes.

module native

Native structures for text and bytes

module nitcorn

nitcorn :: nitcorn

The nitcorn Web server framework creates server-side Web apps in Nit

module numeric

core :: numeric

Advanced services for Numeric types

module pop_handlers

popcorn :: pop_handlers

Route handlers.

module pop_logging

popcorn :: pop_logging

module pop_routes

popcorn :: pop_routes

Internal routes representation.

module pop_sessions

popcorn :: pop_sessions

Session handlers

module pop_tasks

popcorn :: pop_tasks

Popcorn threaded tasks

module poset

Pre order sets and partial order set (ie hierarchies)

module protocol

core :: protocol

module pthreads

pthreads :: pthreads

Main POSIX threads support and intro the classes Thread, Mutex and Barrier

module queue

Queuing data structures and wrappers

module range

Module for range of discrete objects.

module re

Regular expression support for all services based on Pattern

module reactor

nitcorn :: reactor

Core of the nitcorn project, provides HttpFactory and Action

module realtime

realtime :: realtime

Services to keep time of the wall clock time

module ropes

Tree-based representation of a String.

module serialization

serialization :: serialization

General serialization services

module serialization_core

serialization :: serialization_core

Abstract services to serialize Nit objects to different formats

module server_config

nitcorn :: server_config

Classes and services to configure the server

module sessions

nitcorn :: sessions

Automated session management

module signal_handler

nitcorn :: signal_handler

Handle SIGINT and SIGTERM to close the server after all active events

module sorter

This module contains classes used to compare things and sorts arrays.

module stream

Input and output streams of characters

module string_search

core :: string_search

Basic string search, match and replace.

module template

template :: template

Basic template system

module text

All the classes and methods related to the manipulation of text entities

module time

Management of time and dates

module token

nitcorn :: token

Simple generate_token service, independent of the rest of the nitcorn framework

module union_find

core :: union_find

union–find algorithm using an efficient disjoint-set data structure

module utf8

Codec for UTF-8 I/O

module vararg_routes

nitcorn :: vararg_routes

Routes with parameters.

Parents

module popcorn

popcorn :: popcorn

Application server abstraction on top of nitcorn.

Descendants

module a_star-m

module example_html_error_handler is example

import popcorn
import template

class HtmlErrorTemplate
	super Template

	var status: Int
	var message: nullable String

	redef fun rendering do add """
		<!DOCTYPE html>
		<html>
		<head>
			<meta charset="utf-8">
			<title>{{{message or else status}}}</title>
		</head>
		<body>
		<h1>{{{status}}} {{{message or else ""}}}</h1>
		</body>
		</html>"""
end

class HtmlErrorHandler
	super Handler

	redef fun all(req, res) do
		if res.status_code != 200 then
			res.send(new HtmlErrorTemplate(res.status_code, "An error occurred!"))
		end
	end
end

var app = new App
app.use("/*", new HtmlErrorHandler)
app.listen("localhost", 3000)

lib/popcorn/examples/middlewares/example_html_error_handler.nit:17,1--53,29