Error Handling in Interceptors #98
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| // } finally { | ||
| // detachContext(contextWithHeaders, previous); // detach headers from gRPC context | ||
| // } | ||
| // } |
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with close() we can get the exact Status and print it in the access logs.
Need to check how to get this with onCancel() because close() is not guaranteed to be called always according to the javadocs.
| @@ -168,10 +200,10 @@ public void onMessage(Req request) { | |||
| public void onCancel() { | |||
| Context previous = attachContext(contextWithHeaders); // attaching headers to gRPC context | |||
| try { | |||
| grpcFilters.forEach(filter -> filter.doHandleException(new Exception())); | |||
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any better way to get more specific exception/grpc status
| } catch (RuntimeException ex) { | ||
| handleException(call, ex); | ||
| grpcFilters.forEach(filter -> filter.doHandleException(ex)); | ||
| grpcFilters.forEach(filter -> filter.doHandleException(new Exception())); |
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check how to set more descriptive exception containing grpc status code here, like DEADLINE_EXCEEDED
| super.onComplete(); | ||
| grpcFilters.forEach(Filter::doEndFilter); | ||
| } catch (Exception e) { | ||
| handleException(call, grpcFilters, e); |
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we shouldn't be calling handleException here. HandleException is for upstream. For Filter thrown error that needs to be returned without giving it back to the same filter.
| grpcFilters.forEach(filter -> filter.doHandleException(new Exception())); | ||
| grpcFilters.forEach(Filter::doEndFilter); | ||
| } catch (Exception e) { | ||
| handleException(call, grpcFilters, e); |
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Same here, we shouldn't be calling handleException here. HandleException is for upstream. For Filter thrown error that needs to be returned without giving it back to the same filter.
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| /** | ||
| * Method for performing ending functions for a filter. | ||
| */ | ||
| public void doEndFilter() {} |
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Not in favor of this. We already have an destroy method. Lifecycle methods should be used only for lifecycle and not for logic.
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This is not for ending lifecycle. This is for printing logs once only.
| @@ -91,19 +92,23 @@ public final void doFilter(ServletRequest request, ServletResponse response, | |||
| .stream().collect(Collectors.toMap(String::toLowerCase, httpServletResponse::getHeader)); | |||
| filters.forEach(filter -> filter.doProcessResponseHeaders(responseHeaders)); | |||
| responseHeaders.forEach(responseWrapper::setHeader); | |||
| filters.forEach(filter -> filter.doProcessResponse(responseWrapper)); | |||
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This will cause filter thrown exception to be caught. We don't want that. Filter thrown error should not be caught
core/src/main/java/com/flipkart/gjex/core/filter/grpc/AccessLogGrpcFilter.java
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