You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
451 lines
12 KiB
451 lines
12 KiB
/*
|
|
* verror.js: richer JavaScript errors
|
|
*/
|
|
|
|
var mod_assertplus = require('assert-plus');
|
|
var mod_util = require('util');
|
|
|
|
var mod_extsprintf = require('extsprintf');
|
|
var mod_isError = require('core-util-is').isError;
|
|
var sprintf = mod_extsprintf.sprintf;
|
|
|
|
/*
|
|
* Public interface
|
|
*/
|
|
|
|
/* So you can 'var VError = require('verror')' */
|
|
module.exports = VError;
|
|
/* For compatibility */
|
|
VError.VError = VError;
|
|
/* Other exported classes */
|
|
VError.SError = SError;
|
|
VError.WError = WError;
|
|
VError.MultiError = MultiError;
|
|
|
|
/*
|
|
* Common function used to parse constructor arguments for VError, WError, and
|
|
* SError. Named arguments to this function:
|
|
*
|
|
* strict force strict interpretation of sprintf arguments, even
|
|
* if the options in "argv" don't say so
|
|
*
|
|
* argv error's constructor arguments, which are to be
|
|
* interpreted as described in README.md. For quick
|
|
* reference, "argv" has one of the following forms:
|
|
*
|
|
* [ sprintf_args... ] (argv[0] is a string)
|
|
* [ cause, sprintf_args... ] (argv[0] is an Error)
|
|
* [ options, sprintf_args... ] (argv[0] is an object)
|
|
*
|
|
* This function normalizes these forms, producing an object with the following
|
|
* properties:
|
|
*
|
|
* options equivalent to "options" in third form. This will never
|
|
* be a direct reference to what the caller passed in
|
|
* (i.e., it may be a shallow copy), so it can be freely
|
|
* modified.
|
|
*
|
|
* shortmessage result of sprintf(sprintf_args), taking options.strict
|
|
* into account as described in README.md.
|
|
*/
|
|
function parseConstructorArguments(args)
|
|
{
|
|
var argv, options, sprintf_args, shortmessage, k;
|
|
|
|
mod_assertplus.object(args, 'args');
|
|
mod_assertplus.bool(args.strict, 'args.strict');
|
|
mod_assertplus.array(args.argv, 'args.argv');
|
|
argv = args.argv;
|
|
|
|
/*
|
|
* First, figure out which form of invocation we've been given.
|
|
*/
|
|
if (argv.length === 0) {
|
|
options = {};
|
|
sprintf_args = [];
|
|
} else if (mod_isError(argv[0])) {
|
|
options = { 'cause': argv[0] };
|
|
sprintf_args = argv.slice(1);
|
|
} else if (typeof (argv[0]) === 'object') {
|
|
options = {};
|
|
for (k in argv[0]) {
|
|
options[k] = argv[0][k];
|
|
}
|
|
sprintf_args = argv.slice(1);
|
|
} else {
|
|
mod_assertplus.string(argv[0],
|
|
'first argument to VError, SError, or WError ' +
|
|
'constructor must be a string, object, or Error');
|
|
options = {};
|
|
sprintf_args = argv;
|
|
}
|
|
|
|
/*
|
|
* Now construct the error's message.
|
|
*
|
|
* extsprintf (which we invoke here with our caller's arguments in order
|
|
* to construct this Error's message) is strict in its interpretation of
|
|
* values to be processed by the "%s" specifier. The value passed to
|
|
* extsprintf must actually be a string or something convertible to a
|
|
* String using .toString(). Passing other values (notably "null" and
|
|
* "undefined") is considered a programmer error. The assumption is
|
|
* that if you actually want to print the string "null" or "undefined",
|
|
* then that's easy to do that when you're calling extsprintf; on the
|
|
* other hand, if you did NOT want that (i.e., there's actually a bug
|
|
* where the program assumes some variable is non-null and tries to
|
|
* print it, which might happen when constructing a packet or file in
|
|
* some specific format), then it's better to stop immediately than
|
|
* produce bogus output.
|
|
*
|
|
* However, sometimes the bug is only in the code calling VError, and a
|
|
* programmer might prefer to have the error message contain "null" or
|
|
* "undefined" rather than have the bug in the error path crash the
|
|
* program (making the first bug harder to identify). For that reason,
|
|
* by default VError converts "null" or "undefined" arguments to their
|
|
* string representations and passes those to extsprintf. Programmers
|
|
* desiring the strict behavior can use the SError class or pass the
|
|
* "strict" option to the VError constructor.
|
|
*/
|
|
mod_assertplus.object(options);
|
|
if (!options.strict && !args.strict) {
|
|
sprintf_args = sprintf_args.map(function (a) {
|
|
return (a === null ? 'null' :
|
|
a === undefined ? 'undefined' : a);
|
|
});
|
|
}
|
|
|
|
if (sprintf_args.length === 0) {
|
|
shortmessage = '';
|
|
} else {
|
|
shortmessage = sprintf.apply(null, sprintf_args);
|
|
}
|
|
|
|
return ({
|
|
'options': options,
|
|
'shortmessage': shortmessage
|
|
});
|
|
}
|
|
|
|
/*
|
|
* See README.md for reference documentation.
|
|
*/
|
|
function VError()
|
|
{
|
|
var args, obj, parsed, cause, ctor, message, k;
|
|
|
|
args = Array.prototype.slice.call(arguments, 0);
|
|
|
|
/*
|
|
* This is a regrettable pattern, but JavaScript's built-in Error class
|
|
* is defined to work this way, so we allow the constructor to be called
|
|
* without "new".
|
|
*/
|
|
if (!(this instanceof VError)) {
|
|
obj = Object.create(VError.prototype);
|
|
VError.apply(obj, arguments);
|
|
return (obj);
|
|
}
|
|
|
|
/*
|
|
* For convenience and backwards compatibility, we support several
|
|
* different calling forms. Normalize them here.
|
|
*/
|
|
parsed = parseConstructorArguments({
|
|
'argv': args,
|
|
'strict': false
|
|
});
|
|
|
|
/*
|
|
* If we've been given a name, apply it now.
|
|
*/
|
|
if (parsed.options.name) {
|
|
mod_assertplus.string(parsed.options.name,
|
|
'error\'s "name" must be a string');
|
|
this.name = parsed.options.name;
|
|
}
|
|
|
|
/*
|
|
* For debugging, we keep track of the original short message (attached
|
|
* this Error particularly) separately from the complete message (which
|
|
* includes the messages of our cause chain).
|
|
*/
|
|
this.jse_shortmsg = parsed.shortmessage;
|
|
message = parsed.shortmessage;
|
|
|
|
/*
|
|
* If we've been given a cause, record a reference to it and update our
|
|
* message appropriately.
|
|
*/
|
|
cause = parsed.options.cause;
|
|
if (cause) {
|
|
mod_assertplus.ok(mod_isError(cause), 'cause is not an Error');
|
|
this.jse_cause = cause;
|
|
|
|
if (!parsed.options.skipCauseMessage) {
|
|
message += ': ' + cause.message;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If we've been given an object with properties, shallow-copy that
|
|
* here. We don't want to use a deep copy in case there are non-plain
|
|
* objects here, but we don't want to use the original object in case
|
|
* the caller modifies it later.
|
|
*/
|
|
this.jse_info = {};
|
|
if (parsed.options.info) {
|
|
for (k in parsed.options.info) {
|
|
this.jse_info[k] = parsed.options.info[k];
|
|
}
|
|
}
|
|
|
|
this.message = message;
|
|
Error.call(this, message);
|
|
|
|
if (Error.captureStackTrace) {
|
|
ctor = parsed.options.constructorOpt || this.constructor;
|
|
Error.captureStackTrace(this, ctor);
|
|
}
|
|
|
|
return (this);
|
|
}
|
|
|
|
mod_util.inherits(VError, Error);
|
|
VError.prototype.name = 'VError';
|
|
|
|
VError.prototype.toString = function ve_toString()
|
|
{
|
|
var str = (this.hasOwnProperty('name') && this.name ||
|
|
this.constructor.name || this.constructor.prototype.name);
|
|
if (this.message)
|
|
str += ': ' + this.message;
|
|
|
|
return (str);
|
|
};
|
|
|
|
/*
|
|
* This method is provided for compatibility. New callers should use
|
|
* VError.cause() instead. That method also uses the saner `null` return value
|
|
* when there is no cause.
|
|
*/
|
|
VError.prototype.cause = function ve_cause()
|
|
{
|
|
var cause = VError.cause(this);
|
|
return (cause === null ? undefined : cause);
|
|
};
|
|
|
|
/*
|
|
* Static methods
|
|
*
|
|
* These class-level methods are provided so that callers can use them on
|
|
* instances of Errors that are not VErrors. New interfaces should be provided
|
|
* only using static methods to eliminate the class of programming mistake where
|
|
* people fail to check whether the Error object has the corresponding methods.
|
|
*/
|
|
|
|
VError.cause = function (err)
|
|
{
|
|
mod_assertplus.ok(mod_isError(err), 'err must be an Error');
|
|
return (mod_isError(err.jse_cause) ? err.jse_cause : null);
|
|
};
|
|
|
|
VError.info = function (err)
|
|
{
|
|
var rv, cause, k;
|
|
|
|
mod_assertplus.ok(mod_isError(err), 'err must be an Error');
|
|
cause = VError.cause(err);
|
|
if (cause !== null) {
|
|
rv = VError.info(cause);
|
|
} else {
|
|
rv = {};
|
|
}
|
|
|
|
if (typeof (err.jse_info) == 'object' && err.jse_info !== null) {
|
|
for (k in err.jse_info) {
|
|
rv[k] = err.jse_info[k];
|
|
}
|
|
}
|
|
|
|
return (rv);
|
|
};
|
|
|
|
VError.findCauseByName = function (err, name)
|
|
{
|
|
var cause;
|
|
|
|
mod_assertplus.ok(mod_isError(err), 'err must be an Error');
|
|
mod_assertplus.string(name, 'name');
|
|
mod_assertplus.ok(name.length > 0, 'name cannot be empty');
|
|
|
|
for (cause = err; cause !== null; cause = VError.cause(cause)) {
|
|
mod_assertplus.ok(mod_isError(cause));
|
|
if (cause.name == name) {
|
|
return (cause);
|
|
}
|
|
}
|
|
|
|
return (null);
|
|
};
|
|
|
|
VError.hasCauseWithName = function (err, name)
|
|
{
|
|
return (VError.findCauseByName(err, name) !== null);
|
|
};
|
|
|
|
VError.fullStack = function (err)
|
|
{
|
|
mod_assertplus.ok(mod_isError(err), 'err must be an Error');
|
|
|
|
var cause = VError.cause(err);
|
|
|
|
if (cause) {
|
|
return (err.stack + '\ncaused by: ' + VError.fullStack(cause));
|
|
}
|
|
|
|
return (err.stack);
|
|
};
|
|
|
|
VError.errorFromList = function (errors)
|
|
{
|
|
mod_assertplus.arrayOfObject(errors, 'errors');
|
|
|
|
if (errors.length === 0) {
|
|
return (null);
|
|
}
|
|
|
|
errors.forEach(function (e) {
|
|
mod_assertplus.ok(mod_isError(e));
|
|
});
|
|
|
|
if (errors.length == 1) {
|
|
return (errors[0]);
|
|
}
|
|
|
|
return (new MultiError(errors));
|
|
};
|
|
|
|
VError.errorForEach = function (err, func)
|
|
{
|
|
mod_assertplus.ok(mod_isError(err), 'err must be an Error');
|
|
mod_assertplus.func(func, 'func');
|
|
|
|
if (err instanceof MultiError) {
|
|
err.errors().forEach(function iterError(e) { func(e); });
|
|
} else {
|
|
func(err);
|
|
}
|
|
};
|
|
|
|
|
|
/*
|
|
* SError is like VError, but stricter about types. You cannot pass "null" or
|
|
* "undefined" as string arguments to the formatter.
|
|
*/
|
|
function SError()
|
|
{
|
|
var args, obj, parsed, options;
|
|
|
|
args = Array.prototype.slice.call(arguments, 0);
|
|
if (!(this instanceof SError)) {
|
|
obj = Object.create(SError.prototype);
|
|
SError.apply(obj, arguments);
|
|
return (obj);
|
|
}
|
|
|
|
parsed = parseConstructorArguments({
|
|
'argv': args,
|
|
'strict': true
|
|
});
|
|
|
|
options = parsed.options;
|
|
VError.call(this, options, '%s', parsed.shortmessage);
|
|
|
|
return (this);
|
|
}
|
|
|
|
/*
|
|
* We don't bother setting SError.prototype.name because once constructed,
|
|
* SErrors are just like VErrors.
|
|
*/
|
|
mod_util.inherits(SError, VError);
|
|
|
|
|
|
/*
|
|
* Represents a collection of errors for the purpose of consumers that generally
|
|
* only deal with one error. Callers can extract the individual errors
|
|
* contained in this object, but may also just treat it as a normal single
|
|
* error, in which case a summary message will be printed.
|
|
*/
|
|
function MultiError(errors)
|
|
{
|
|
mod_assertplus.array(errors, 'list of errors');
|
|
mod_assertplus.ok(errors.length > 0, 'must be at least one error');
|
|
this.ase_errors = errors;
|
|
|
|
VError.call(this, {
|
|
'cause': errors[0]
|
|
}, 'first of %d error%s', errors.length, errors.length == 1 ? '' : 's');
|
|
}
|
|
|
|
mod_util.inherits(MultiError, VError);
|
|
MultiError.prototype.name = 'MultiError';
|
|
|
|
MultiError.prototype.errors = function me_errors()
|
|
{
|
|
return (this.ase_errors.slice(0));
|
|
};
|
|
|
|
|
|
/*
|
|
* See README.md for reference details.
|
|
*/
|
|
function WError()
|
|
{
|
|
var args, obj, parsed, options;
|
|
|
|
args = Array.prototype.slice.call(arguments, 0);
|
|
if (!(this instanceof WError)) {
|
|
obj = Object.create(WError.prototype);
|
|
WError.apply(obj, args);
|
|
return (obj);
|
|
}
|
|
|
|
parsed = parseConstructorArguments({
|
|
'argv': args,
|
|
'strict': false
|
|
});
|
|
|
|
options = parsed.options;
|
|
options['skipCauseMessage'] = true;
|
|
VError.call(this, options, '%s', parsed.shortmessage);
|
|
|
|
return (this);
|
|
}
|
|
|
|
mod_util.inherits(WError, VError);
|
|
WError.prototype.name = 'WError';
|
|
|
|
WError.prototype.toString = function we_toString()
|
|
{
|
|
var str = (this.hasOwnProperty('name') && this.name ||
|
|
this.constructor.name || this.constructor.prototype.name);
|
|
if (this.message)
|
|
str += ': ' + this.message;
|
|
if (this.jse_cause && this.jse_cause.message)
|
|
str += '; caused by ' + this.jse_cause.toString();
|
|
|
|
return (str);
|
|
};
|
|
|
|
/*
|
|
* For purely historical reasons, WError's cause() function allows you to set
|
|
* the cause.
|
|
*/
|
|
WError.prototype.cause = function we_cause(c)
|
|
{
|
|
if (mod_isError(c))
|
|
this.jse_cause = c;
|
|
|
|
return (this.jse_cause);
|
|
};
|