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Franz Liedke 11e76b1965 Implement new error handling stack
This separates the error registry (mapping exception types to status
codes) from actual handling (the middleware) as well as error formatting
(Whoops, pretty error pages or JSON-API?) and reporting (log? Sentry?).

The components can be reused in different places (e.g. the API client
and the error handler middleware both need the registry to understand
all the exceptions Flarum knows how to handle), while still allowing to
change only the parts that need to change (the API stack always uses the
JSON-API formatter, and the forum stack switches between Whoops and
pretty error pages based on debug mode).

Finally, this paves the way for some planned features and extensibility:
- A console error handler can build on top of the registry.
- Extensions can register new exceptions and how to handle them.
- Extensions can change how we report exceptions (e.g. Sentry).
- We can build more pretty error pages, even different ones for
  exceptions having the same status code.
2019-08-10 00:26:22 +02:00
framework/core Implement new error handling stack 2019-08-10 00:26:22 +02:00