fileserver/lib/restbed-4.8/documentation/example/ERROR_HANDLING.md

Overview

"Error handling refers to the anticipation, detection, and resolution of programming, application, and communications errors. Specialized programs, called error handlers, are available for some applications. The best programs of this type forestall errors if possible, recover from them when they occur without terminating the application, or (if all else fails) gracefully terminate an affected application and save the error information to a log file." -- TechTarget

Example

#include <memory>
#include <cstdlib>
#include <stdexcept>
#include <restbed>

using namespace std;
using namespace restbed;

void faulty_method_handler( const shared_ptr< Session > )
{
    throw SERVICE_UNAVAILABLE;
}

void resource_error_handler( const int, const exception&, const shared_ptr< Session > session )
{
    if ( session->is_open( ) )
        session->close( 6000, "Custom Resource Internal Server Error", { { "Content-Length", "37" } } );
    else
        fprintf( stderr, "Custom Resource Internal Server Error\n" );
}

void service_error_handler( const int, const exception&, const shared_ptr< Session > session )
{
    if ( session->is_open( ) )
        session->close( 5000, "Custom Service Internal Server Error", { { "Content-Length", "36" } } );
    else
        fprintf( stderr, "Custom Service Internal Server Error\n" );
}

int main( const int, const char** )
{
    auto one = make_shared< Resource >( );
    one->set_path( "/resources/1" );
    one->set_method_handler( "GET", faulty_method_handler );
    
    auto two = make_shared< Resource >( );
    two->set_path( "/resources/2" );
    two->set_method_handler( "GET", faulty_method_handler );
    two->set_error_handler( &resource_error_handler );
    
    auto settings = make_shared< Settings >( );
    settings->set_port( 1984 );
    settings->set_default_header( "Connection", "close" );
    
    Service service;
    service.publish( one );
    service.publish( two );
    service.set_error_handler( service_error_handler );
    
    service.start( settings );
    
    return EXIT_SUCCESS;
}

Build

$ clang++ -o example example.cpp -l restbed

Execution

$ ./example

$ curl -w'\n' -v -XGET 'http://localhost:1984/resources/1'

$ curl -w'\n' -v -XGET 'http://localhost:1984/resources/2'