angular2
Version:
Angular 2 - a web framework for modern web apps
123 lines • 15.8 kB
JavaScript
import { isPresent, isBlank } from 'angular2/src/facade/lang';
import { BaseWrappedException } from 'angular2/src/facade/base_wrapped_exception';
import { isListLikeIterable } from 'angular2/src/facade/collection';
class _ArrayLogger {
constructor() {
this.res = [];
}
log(s) { this.res.push(s); }
logError(s) { this.res.push(s); }
logGroup(s) { this.res.push(s); }
logGroupEnd() { }
;
}
/**
* Provides a hook for centralized exception handling.
*
* The default implementation of `ExceptionHandler` prints error messages to the `Console`. To
* intercept error handling,
* write a custom exception handler that replaces this default as appropriate for your app.
*
* ### Example
*
* ```javascript
*
* class MyExceptionHandler implements ExceptionHandler {
* call(error, stackTrace = null, reason = null) {
* // do something with the exception
* }
* }
*
* bootstrap(MyApp, [provide(ExceptionHandler, {useClass: MyExceptionHandler})])
*
* ```
*/
export class ExceptionHandler {
constructor(_logger, _rethrowException = true) {
this._logger = _logger;
this._rethrowException = _rethrowException;
}
static exceptionToString(exception, stackTrace = null, reason = null) {
var l = new _ArrayLogger();
var e = new ExceptionHandler(l, false);
e.call(exception, stackTrace, reason);
return l.res.join("\n");
}
call(exception, stackTrace = null, reason = null) {
var originalException = this._findOriginalException(exception);
var originalStack = this._findOriginalStack(exception);
var context = this._findContext(exception);
this._logger.logGroup(`EXCEPTION: ${this._extractMessage(exception)}`);
if (isPresent(stackTrace) && isBlank(originalStack)) {
this._logger.logError("STACKTRACE:");
this._logger.logError(this._longStackTrace(stackTrace));
}
if (isPresent(reason)) {
this._logger.logError(`REASON: ${reason}`);
}
if (isPresent(originalException)) {
this._logger.logError(`ORIGINAL EXCEPTION: ${this._extractMessage(originalException)}`);
}
if (isPresent(originalStack)) {
this._logger.logError("ORIGINAL STACKTRACE:");
this._logger.logError(this._longStackTrace(originalStack));
}
if (isPresent(context)) {
this._logger.logError("ERROR CONTEXT:");
this._logger.logError(context);
}
this._logger.logGroupEnd();
// We rethrow exceptions, so operations like 'bootstrap' will result in an error
// when an exception happens. If we do not rethrow, bootstrap will always succeed.
if (this._rethrowException)
throw exception;
}
/** @internal */
_extractMessage(exception) {
return exception instanceof BaseWrappedException ? exception.wrapperMessage :
exception.toString();
}
/** @internal */
_longStackTrace(stackTrace) {
return isListLikeIterable(stackTrace) ? stackTrace.join("\n\n-----async gap-----\n") :
stackTrace.toString();
}
/** @internal */
_findContext(exception) {
try {
if (!(exception instanceof BaseWrappedException))
return null;
return isPresent(exception.context) ? exception.context :
this._findContext(exception.originalException);
}
catch (e) {
// exception.context can throw an exception. if it happens, we ignore the context.
return null;
}
}
/** @internal */
_findOriginalException(exception) {
if (!(exception instanceof BaseWrappedException))
return null;
var e = exception.originalException;
while (e instanceof BaseWrappedException && isPresent(e.originalException)) {
e = e.originalException;
}
return e;
}
/** @internal */
_findOriginalStack(exception) {
if (!(exception instanceof BaseWrappedException))
return null;
var e = exception;
var stack = exception.originalStack;
while (e instanceof BaseWrappedException && isPresent(e.originalException)) {
e = e.originalException;
if (e instanceof BaseWrappedException && isPresent(e.originalException)) {
stack = e.originalStack;
}
}
return stack;
}
}
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To\n * intercept error handling,\n * write a custom exception handler that replaces this default as appropriate for your app.\n *\n * ### Example\n *\n * ```javascript\n *\n * class MyExceptionHandler implements ExceptionHandler {\n *   call(error, stackTrace = null, reason = null) {\n *     // do something with the exception\n *   }\n * }\n *\n * bootstrap(MyApp, [provide(ExceptionHandler, {useClass: MyExceptionHandler})])\n *\n * ```\n */\nexport class ExceptionHandler {\n  constructor(private _logger: any, private _rethrowException: boolean = true) {}\n\n  static exceptionToString(exception: any, stackTrace: any = null, reason: string = null): string {\n    var l = new _ArrayLogger();\n    var e = new ExceptionHandler(l, false);\n    e.call(exception, stackTrace, reason);\n    return l.res.join(\"\\n\");\n  }\n\n  call(exception: any, stackTrace: any = null, reason: string = null): void {\n    var originalException = this._findOriginalException(exception);\n    var originalStack = this._findOriginalStack(exception);\n    var context = this._findContext(exception);\n\n    this._logger.logGroup(`EXCEPTION: ${this._extractMessage(exception)}`);\n\n    if (isPresent(stackTrace) && isBlank(originalStack)) {\n      this._logger.logError(\"STACKTRACE:\");\n      this._logger.logError(this._longStackTrace(stackTrace));\n    }\n\n    if (isPresent(reason)) {\n      this._logger.logError(`REASON: ${reason}`);\n    }\n\n    if (isPresent(originalException)) {\n      this._logger.logError(`ORIGINAL EXCEPTION: ${this._extractMessage(originalException)}`);\n    }\n\n    if (isPresent(originalStack)) {\n      this._logger.logError(\"ORIGINAL STACKTRACE:\");\n      this._logger.logError(this._longStackTrace(originalStack));\n    }\n\n    if (isPresent(context)) {\n      this._logger.logError(\"ERROR CONTEXT:\");\n      this._logger.logError(context);\n    }\n\n    this._logger.logGroupEnd();\n\n    // We rethrow exceptions, so operations like 'bootstrap' will result in an error\n    // when an exception happens. If we do not rethrow, bootstrap will always succeed.\n    if (this._rethrowException) throw exception;\n  }\n\n  /** @internal */\n  _extractMessage(exception: any): string {\n    return exception instanceof BaseWrappedException ? exception.wrapperMessage :\n                                                       exception.toString();\n  }\n\n  /** @internal */\n  _longStackTrace(stackTrace: any): any {\n    return isListLikeIterable(stackTrace) ? (<any[]>stackTrace).join(\"\\n\\n-----async gap-----\\n\") :\n                                            stackTrace.toString();\n  }\n\n  /** @internal */\n  _findContext(exception: any): any {\n    try {\n      if (!(exception instanceof BaseWrappedException)) return null;\n      return isPresent(exception.context) ? exception.context :\n                                            this._findContext(exception.originalException);\n    } catch (e) {\n      // exception.context can throw an exception. if it happens, we ignore the context.\n      return null;\n    }\n  }\n\n  /** @internal */\n  _findOriginalException(exception: any): any {\n    if (!(exception instanceof BaseWrappedException)) return null;\n\n    var e = exception.originalException;\n    while (e instanceof BaseWrappedException && isPresent(e.originalException)) {\n      e = e.originalException;\n    }\n\n    return e;\n  }\n\n  /** @internal */\n  _findOriginalStack(exception: any): any {\n    if (!(exception instanceof BaseWrappedException)) return null;\n\n    var e = exception;\n    var stack = exception.originalStack;\n    while (e instanceof BaseWrappedException && isPresent(e.originalException)) {\n      e = e.originalException;\n      if (e instanceof BaseWrappedException && isPresent(e.originalException)) {\n        stack = e.originalStack;\n      }\n    }\n\n    return stack;\n  }\n}\n"]}