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exception-interceptor (clj)
(source)function
(exception-interceptor)
(exception-interceptor handlers)
Creates an Interceptor that catches all exceptions. Takes a map
of `identifier => exception request => response` that is used to select
the exception handler for the thrown/raised exception identifier. Exception
identifier is either a `Keyword` or a Exception Class.
The following handlers special handlers are available:
| key | description
|------------------------|-------------
| `::exception/default` | a default exception handler if nothing else matched (default [[default-handler]]).
| `::exception/wrap` | a 3-arity handler to wrap the actual handler `handler exception request => response`
The handler is selected from the options map by exception identifier
in the following lookup order:
1) `:type` of exception ex-data
2) Class of exception
3) `:type` ancestors of exception ex-data
4) Super Classes of exception
5) The ::default handler
Example:
(require '[reitit.ring.interceptors.exception :as exception])
;; type hierarchy
(derive ::error ::exception)
(derive ::failure ::exception)
(derive ::horror ::exception)
(defn handler [message exception request]
{:status 500
:body {:message message
:exception (str exception)
:uri (:uri request)}})
(exception/exception-interceptor
(merge
exception/default-handlers
{;; ex-data with :type ::error
::error (partial handler "error")
;; ex-data with ::exception or ::failure
::exception (partial handler "exception")
;; SQLException and all it's child classes
java.sql.SQLException (partial handler "sql-exception")
;; override the default handler
::exception/default (partial handler "default")
;; print stack-traces for all exceptions
::exception/wrap (fn [handler e request]
(.printStackTrace e)
(handler e request))}))