Error Handling Module
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Q&A Tutorials Poetry RecentThreads NewestNodes Donate What'sNew on Jun 13, 2005 at 22:36UTC ( #466310=perlquestion: print w/replies, xml ) Need Help?? sgifford has asked for the wisdom of the Perl Monks concerning the following question: As seems to happen to all Perl programmers eventually, perl exception handling module I've been thinking about error handling in modules I code. It seems like I perl constructor error handling always start off just returning undef or using die, then after a while want to know more information about why perl return error from module something failed, and end up writing some kind of half-assed error handling system, which I gradually expand. And this seems to be what everybody else does, so you have to wade through documentation to perl library error handling know whether a module has custom error handling code, uses variables like $! or $@, or just dies. I usually end up just writing things like: my $obj = Some::Object->new() or die "Couldn't create Some::object - $!\n"; [download] and plan on fixing it later, which only occasionally happens. die and eval solve part of this problem, but it's annoying to have to wrap every constructor and method
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call inside of an eval block, and in general die should only be used for truly unexpected and exceptional conditions, not simple errors that may happen from time to time. Realizing I was about to start coding another half-assed error handling system, I decided instead to try to put together something more flexible. My goals are: Modules should be able to use it with minimal headache Consistent and straightforward interface for module users. Possible to use in a thread-safe way Flexible I've posted the code for my fellow monks' consideration and comments. I used it for a module called Ekahau, so it's called Ekahau::ErrHandler; of course it would be renamed if I uploaded it to CPAN. Interface for Module Programmers To make this as simple as possible for module programmers, there are only 5 simple requirements: Inherit from Ekahau::ErrHandler Implement an ERROBJ method which returns the error object. Create an error handler object in the constructor. Inform the error handling module when the object is constructed, so it can store error methods in the object instead of in a class-wide variable. Indicate error with return $self->reterr("error message"), which will set the error message then return undef. For example, here's a typi
middleware is only intended to be used in a development environment, as the full error stack traces and internal details of any object passed to this module will be
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sent back to the client when an error occurs. When an yii2 module error handler object is provided to Express as an error, this module will display as much about this object as ms access vba error handling possible, and will do so by using content negotiation for the response between HTML, JSON, and plain text. When the object is a standard Error object, the string http://www.perlmonks.org/?node_id=466310 provided by the stack property will be returned in HTML/text responses. When the object is a non-Error object, the result of util.inspect will be returned in HTML/text responses. For JSON responses, the result will be an object with all enumerable properties from the object in the response. Install $ npm install errorhandler API var errorhandler = require('errorhandler') errorhandler(options) Create new middleware to handle errors https://www.npmjs.com/package/errorhandler and respond with content negotiation. Options Error handler accepts these properties in the options object. log Provide a function to be called with the error and a string representation of the error. Can be used to write the error to any desired location, or set to false to only send the error back in the response. Called as log(err, str, req, res) where err is the Error object, str is a string representation of the error, req is the request object and res is the response object (note, this function is invoked after the response has been written). The default value for this option is true unless process.env.NODE_ENV === 'test'. Possible values: true: Log errors using console.error(str). false: Only send the error back in the response. A function: pass the error to a function for handling. Examples Simple example Basic example of adding this middleware as the error handler only in development with connect (express also can be used in this example). var connect = require('connect')var errorhandler = require('errorhandler') var app = connect() if (process.env.NODE_ENV === 'development') { // only use in development app.use(errorhandler())} Custom output location Sometimes you may want to o
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