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Allow to manually tag request metrics with exceptions 

Prior to this commit, some exceptions handled at the controller or
handler function level would:

* not bubble up to the Spring Boot error handling support
* not be tagged as part of the request metrics

This situation is inconsistent because in general, exceptions handled at
the controller level can be considered as expected behavior.
Also, depending on how the exception is handled, the request metrics
might not be tagged with the exception.
This will be reconsidered in gh-23795.

This commit prepares a transition to the new situation. Developers can
now opt-in and set the handled exception as a request attribute. This
well-known attribute will be later read by the metrics support and used
for tagging the request metrics with the exception provided.

This mechanism is automatically used by the error handling support in
Spring Boot.

Closes gh-24028
This commit is contained in:
Brian Clozel 2021-04-01 16:33:31 +02:00
parent 66e9619d65
commit 72a1eb6384
14 changed files with 177 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/web/reactive/server/MetricsWebFilter.java
View File

@ -24,6 +24,7 @@ import org.reactivestreams.Publisher;
import reactor.core.publisher.Mono;
import org.springframework.boot.actuate.metrics.AutoTimer;
import org.springframework.boot.web.reactive.error.ErrorAttributes;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
import org.springframework.http.server.reactive.ServerHttpResponse;
@ -93,6 +94,9 @@ public class MetricsWebFilter implements WebFilter {
}
private void record(ServerWebExchange exchange, Throwable cause, long start) {
if (cause == null) {
cause = exchange.getAttribute(ErrorAttributes.ERROR_ATTRIBUTE);
}
Iterable<Tag> tags = this.tagsProvider.httpRequestTags(exchange, cause);
this.autoTimer.builder(this.metricName).tags(tags).register(this.registry).record(System.nanoTime() - start,
TimeUnit.NANOSECONDS);

13
spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/web/servlet/WebMvcMetricsFilter.java
View File

@ -1,5 +1,5 @@
/*
* Copyright 2012-2020 the original author or authors.
* Copyright 2012-2021 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@ -33,6 +33,7 @@ import io.micrometer.core.instrument.Timer.Builder;
import io.micrometer.core.instrument.Timer.Sample;
import org.springframework.boot.actuate.metrics.AutoTimer;
import org.springframework.boot.web.servlet.error.ErrorAttributes;
import org.springframework.core.annotation.MergedAnnotationCollectors;
import org.springframework.core.annotation.MergedAnnotations;
import org.springframework.http.HttpStatus;
@ -96,7 +97,7 @@ public class WebMvcMetricsFilter extends OncePerRequestFilter {
// If async was started by something further down the chain we wait
// until the second filter invocation (but we'll be using the
// TimingContext that was attached to the first)
Throwable exception = (Throwable) request.getAttribute(DispatcherServlet.EXCEPTION_ATTRIBUTE);
Throwable exception = fetchException(request);
record(timingContext, request, response, exception);
}
}
@ -118,6 +119,14 @@ public class WebMvcMetricsFilter extends OncePerRequestFilter {
return timingContext;
}
private Throwable fetchException(HttpServletRequest request) {
Throwable exception = (Throwable) request.getAttribute(ErrorAttributes.ERROR_ATTRIBUTE);
if (exception == null) {
exception = (Throwable) request.getAttribute(DispatcherServlet.EXCEPTION_ATTRIBUTE);
}
return exception;
}
private void record(TimingContext timingContext, HttpServletRequest request, HttpServletResponse response,
Throwable exception) {
Object handler = getHandler(request);

13
spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/metrics/web/reactive/server/MetricsWebFilterTests.java
View File

@ -28,6 +28,7 @@ import reactor.core.publisher.Mono;
import reactor.test.StepVerifier;
import org.springframework.boot.actuate.metrics.AutoTimer;
import org.springframework.boot.web.reactive.error.ErrorAttributes;
import org.springframework.mock.http.server.reactive.MockServerHttpRequest;
import org.springframework.mock.web.server.MockServerWebExchange;
import org.springframework.web.reactive.HandlerMapping;
@ -94,6 +95,18 @@ class MetricsWebFilterTests {
assertMetricsContainsTag("exception", anonymous.getClass().getName());
}
@Test
void filterAddsTagsToRegistryForHandledExceptions() {
MockServerWebExchange exchange = createExchange("/projects/spring-boot", "/projects/{project}");
this.webFilter.filter(exchange, (serverWebExchange) -> {
exchange.getAttributes().put(ErrorAttributes.ERROR_ATTRIBUTE, new IllegalStateException("test error"));
return exchange.getResponse().setComplete();
}).block(Duration.ofSeconds(30));
assertMetricsContainsTag("uri", "/projects/{project}");
assertMetricsContainsTag("status", "200");
assertMetricsContainsTag("exception", "IllegalStateException");
}
@Test
void filterAddsTagsToRegistryForExceptionsAndCommittedResponse() {
MockServerWebExchange exchange = createExchange("/projects/spring-boot", "/projects/{project}");

8
spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/metrics/web/servlet/WebMvcMetricsFilterTests.java
View File

@ -1,5 +1,5 @@
/*
* Copyright 2012-2020 the original author or authors.
* Copyright 2012-2021 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@ -57,6 +57,7 @@ import org.junit.jupiter.api.extension.ExtendWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.actuate.metrics.AutoTimer;
import org.springframework.boot.web.servlet.error.ErrorAttributes;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
@ -264,7 +265,8 @@ class WebMvcMetricsFilterTests {
@Test
void endpointThrowsError() throws Exception {
this.mvc.perform(get("/api/c1/error/10")).andExpect(status().is4xxClientError());
assertThat(this.registry.get("http.server.requests").tags("status", "422").timer().count()).isEqualTo(1L);
assertThat(this.registry.get("http.server.requests").tags("status", "422", "exception", "IllegalStateException")
.timer().count()).isEqualTo(1L);
}
@Test
@ -491,6 +493,8 @@ class WebMvcMetricsFilterTests {
@ExceptionHandler(IllegalStateException.class)
@ResponseStatus(HttpStatus.UNPROCESSABLE_ENTITY)
ModelAndView defaultErrorHandler(HttpServletRequest request, Exception e) {
// this is done by ErrorAttributes implementations
request.setAttribute(ErrorAttributes.ERROR_ATTRIBUTE, e);
return new ModelAndView("myerror");
}

5
spring-boot-project/spring-boot-docs/src/docs/asciidoc/production-ready-features.adoc
View File

@ -2188,6 +2188,8 @@ By default, Spring MVC-related metrics are tagged with the following information
To add to the default tags, provide one or more ``@Bean``s that implement `WebMvcTagsContributor`.
To replace the default tags, provide a `@Bean` that implements `WebMvcTagsProvider`.
TIP: In some cases, exceptions handled in Web controllers are not recorded as request metrics tags.
Applications can opt-in and record exceptions by <<spring-boot-features.adoc#boot-features-error-handling, setting handled exceptions as request parameters>>.
[[production-ready-metrics-web-flux]]
@ -2222,7 +2224,8 @@ By default, WebFlux-related metrics are tagged with the following information:
To add to the default tags, provide one or more ``@Bean``s that implement `WebFluxTagsContributor`.
To replace the default tags, provide a `@Bean` that implements `WebFluxTagsProvider`.
TIP: In some cases, exceptions handled in controllers and handler functions are not recorded as request metrics tags.
Applications can opt-in and record exceptions by <<spring-boot-features.adoc#boot-features-webflux-error-handling, setting handled exceptions as request parameters>>.
[[production-ready-metrics-jersey-server]]
==== Jersey Server Metrics

14
spring-boot-project/spring-boot-docs/src/docs/asciidoc/spring-boot-features.adoc
View File

@ -2566,7 +2566,13 @@ include::{include-springbootfeatures}/webapplications/servlet/MyControllerAdvice
In the preceding example, if `YourException` is thrown by a controller defined in the same package as `AcmeController`, a JSON representation of the `CustomErrorType` POJO is used instead of the `ErrorAttributes` representation.
In some cases, errors handled at the controller level are not recorded by the <<production-ready-features.adoc#production-ready-metrics-spring-mvc, metrics infrastructure>>.
Applications can ensure that such exceptions are recorded with the request metrics by setting the handled exception as a request attribute:
[source,java,indent=0,subs="verbatim,quotes,attributes"]
----
include::{include-springbootfeatures}/webapplications/servlet/MyController.java[]
----
[[boot-features-error-handling-custom-error-pages]]
===== Custom Error Pages
@ -2823,6 +2829,14 @@ include::{include-springbootfeatures}/webapplications/webflux/CustomErrorWebExce
For a more complete picture, you can also subclass `DefaultErrorWebExceptionHandler` directly and override specific methods.
In some cases, errors handled at the controller or handler function level are not recorded by the <<production-ready-features.adoc#production-ready-metrics-web-flux, metrics infrastructure>>.
Applications can ensure that such exceptions are recorded with the request metrics by setting the handled exception as a request attribute:
[source,java,indent=0,subs="verbatim,quotes,attributes"]
----
include::{include-springbootfeatures}/webapplications/webflux/ExceptionHandlingController.java[]
----
[[boot-features-webflux-error-handling-custom-error-pages]]

39
spring-boot-project/spring-boot-docs/src/main/java/org/springframework/boot/docs/springbootfeatures/webapplications/servlet/MyController.java Normal file
View File

@ -0,0 +1,39 @@
/*
* Copyright 2012-2021 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.boot.docs.springbootfeatures.webapplications.servlet;
import javax.servlet.http.HttpServletRequest;
import org.springframework.boot.web.servlet.error.ErrorAttributes;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ExceptionHandler;
@Controller
public class MyController {
@ExceptionHandler(CustomException.class)
String handleCustomException(HttpServletRequest request, CustomException ex) {
request.setAttribute(ErrorAttributes.ERROR_ATTRIBUTE, ex);
return "errorView";
}
}
// @chomp:file
class CustomException extends RuntimeException {
}

42
spring-boot-project/spring-boot-docs/src/main/java/org/springframework/boot/docs/springbootfeatures/webapplications/webflux/ExceptionHandlingController.java Normal file
View File

@ -0,0 +1,42 @@
/*
* Copyright 2012-2021 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.boot.docs.springbootfeatures.webapplications.webflux;
import org.springframework.boot.web.reactive.error.ErrorAttributes;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.reactive.result.view.Rendering;
import org.springframework.web.server.ServerWebExchange;
@Controller
public class ExceptionHandlingController {
@GetMapping("/profile")
public Rendering userProfile() {
// ..
throw new IllegalStateException();
// ...
}
@ExceptionHandler(IllegalStateException.class)
Rendering handleIllegalState(ServerWebExchange exchange, IllegalStateException exc) {
exchange.getAttributes().putIfAbsent(ErrorAttributes.ERROR_ATTRIBUTE, exc);
return Rendering.view("errorView").modelAttribute("message", exc.getMessage()).build();
}
}

9
spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/reactive/error/DefaultErrorAttributes.java
View File

@ -21,6 +21,7 @@ import java.io.StringWriter;
import java.util.Date;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Optional;
import org.springframework.boot.web.error.ErrorAttributeOptions;
import org.springframework.boot.web.error.ErrorAttributeOptions.Include;
@ -61,7 +62,7 @@ import org.springframework.web.server.ServerWebExchange;
*/
public class DefaultErrorAttributes implements ErrorAttributes {
private static final String ERROR_ATTRIBUTE = DefaultErrorAttributes.class.getName() + ".ERROR";
private static final String ERROR_INTERNAL_ATTRIBUTE = DefaultErrorAttributes.class.getName() + ".ERROR";
@Override
public Map<String, Object> getErrorAttributes(ServerRequest request, ErrorAttributeOptions options) {
@ -147,13 +148,15 @@ public class DefaultErrorAttributes implements ErrorAttributes {
@Override
public Throwable getError(ServerRequest request) {
return (Throwable) request.attribute(ERROR_ATTRIBUTE)
Optional<Object> error = request.attribute(ERROR_INTERNAL_ATTRIBUTE);
error.ifPresent((value) -> request.attributes().putIfAbsent(ErrorAttributes.ERROR_ATTRIBUTE, value));
return (Throwable) error
.orElseThrow(() -> new IllegalStateException("Missing exception attribute in ServerWebExchange"));
}
@Override
public void storeErrorInformation(Throwable error, ServerWebExchange exchange) {
exchange.getAttributes().putIfAbsent(ERROR_ATTRIBUTE, error);
exchange.getAttributes().putIfAbsent(ERROR_INTERNAL_ATTRIBUTE, error);
}
}

7
spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/reactive/error/ErrorAttributes.java
View File

@ -34,6 +34,13 @@ import org.springframework.web.server.ServerWebExchange;
*/
public interface ErrorAttributes {
/**
* Name of the {@link ServerRequest#attribute(String)} Request attribute} holding the
* error resolved by the {@code ErrorAttributes} implementation.
* @since 2.5.0
*/
String ERROR_ATTRIBUTE = ErrorAttributes.class.getName() + ".error";
/**
* Return a {@link Map} of the error attributes. The map can be used as the model of
* an error page, or returned as a {@link ServerResponse} body.

14
spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/servlet/error/DefaultErrorAttributes.java
View File

@ -68,7 +68,7 @@ import org.springframework.web.servlet.ModelAndView;
@Order(Ordered.HIGHEST_PRECEDENCE)
public class DefaultErrorAttributes implements ErrorAttributes, HandlerExceptionResolver, Ordered {
private static final String ERROR_ATTRIBUTE = DefaultErrorAttributes.class.getName() + ".ERROR";
private static final String ERROR_INTERNAL_ATTRIBUTE = DefaultErrorAttributes.class.getName() + ".ERROR";
@Override
public int getOrder() {
@ -83,7 +83,7 @@ public class DefaultErrorAttributes implements ErrorAttributes, HandlerException
}
private void storeErrorAttributes(HttpServletRequest request, Exception ex) {
request.setAttribute(ERROR_ATTRIBUTE, ex);
request.setAttribute(ERROR_INTERNAL_ATTRIBUTE, ex);
}
@Override
@ -216,8 +216,14 @@ public class DefaultErrorAttributes implements ErrorAttributes, HandlerException
@Override
public Throwable getError(WebRequest webRequest) {
Throwable exception = getAttribute(webRequest, ERROR_ATTRIBUTE);
return (exception != null) ? exception : getAttribute(webRequest, RequestDispatcher.ERROR_EXCEPTION);
Throwable exception = getAttribute(webRequest, ERROR_INTERNAL_ATTRIBUTE);
if (exception == null) {
exception = getAttribute(webRequest, RequestDispatcher.ERROR_EXCEPTION);
}
// store the exception in a well-known attribute to make it available to metrics
// instrumentation.
webRequest.setAttribute(ErrorAttributes.ERROR_ATTRIBUTE, exception, WebRequest.SCOPE_REQUEST);
return exception;
}
@SuppressWarnings("unchecked")

8
spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/servlet/error/ErrorAttributes.java
View File

@ -34,6 +34,14 @@ import org.springframework.web.servlet.ModelAndView;
*/
public interface ErrorAttributes {
/**
* Name of the {@link javax.servlet.http.HttpServletRequest#getAttribute(String)
* Request attribute} holding the error resolved by the {@code ErrorAttributes}
* implementation.
* @since 2.5.0
*/
String ERROR_ATTRIBUTE = ErrorAttributes.class.getName() + ".error";
/**
* Returns a {@link Map} of the error attributes. The map can be used as the model of
* an error page {@link ModelAndView}, or returned as a

3
spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/reactive/error/DefaultErrorAttributesTests.java
View File

@ -160,6 +160,7 @@ class DefaultErrorAttributesTests {
Map<String, Object> attributes = this.errorAttributes.getErrorAttributes(serverRequest,
ErrorAttributeOptions.of(Include.EXCEPTION, Include.MESSAGE));
assertThat(this.errorAttributes.getError(serverRequest)).isSameAs(error);
assertThat(serverRequest.attribute(ErrorAttributes.ERROR_ATTRIBUTE)).containsSame(error);
assertThat(attributes.get("exception")).isEqualTo(RuntimeException.class.getName());
assertThat(attributes.get("message")).isEqualTo("Test");
}
@ -177,6 +178,7 @@ class DefaultErrorAttributesTests {
assertThat(attributes.get("message")).isEqualTo("invalid request");
assertThat(attributes.get("exception")).isEqualTo(RuntimeException.class.getName());
assertThat(this.errorAttributes.getError(serverRequest)).isSameAs(error);
assertThat(serverRequest.attribute(ErrorAttributes.ERROR_ATTRIBUTE)).containsSame(error);
}
@Test
@ -192,6 +194,7 @@ class DefaultErrorAttributesTests {
assertThat(attributes.get("message")).isEqualTo("could not process request");
assertThat(attributes.get("exception")).isEqualTo(ResponseStatusException.class.getName());
assertThat(this.errorAttributes.getError(serverRequest)).isSameAs(error);
assertThat(serverRequest.attribute(ErrorAttributes.ERROR_ATTRIBUTE)).containsSame(error);
}
@Test

10
spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/servlet/error/DefaultErrorAttributesTests.java
View File

@ -89,6 +89,8 @@ class DefaultErrorAttributesTests {
Map<String, Object> attributes = this.errorAttributes.getErrorAttributes(this.webRequest,
ErrorAttributeOptions.of(Include.MESSAGE));
assertThat(this.errorAttributes.getError(this.webRequest)).isSameAs(ex);
assertThat(this.webRequest.getAttribute(ErrorAttributes.ERROR_ATTRIBUTE, WebRequest.SCOPE_REQUEST))
.isSameAs(ex);
assertThat(modelAndView).isNull();
assertThat(attributes).doesNotContainKey("exception");
assertThat(attributes.get("message")).isEqualTo("Test");
@ -101,6 +103,8 @@ class DefaultErrorAttributesTests {
Map<String, Object> attributes = this.errorAttributes.getErrorAttributes(this.webRequest,
ErrorAttributeOptions.of(Include.MESSAGE));
assertThat(this.errorAttributes.getError(this.webRequest)).isSameAs(ex);
assertThat(this.webRequest.getAttribute(ErrorAttributes.ERROR_ATTRIBUTE, WebRequest.SCOPE_REQUEST))
.isSameAs(ex);
assertThat(attributes).doesNotContainKey("exception");
assertThat(attributes.get("message")).isEqualTo("Test");
}
@ -112,6 +116,8 @@ class DefaultErrorAttributesTests {
Map<String, Object> attributes = this.errorAttributes.getErrorAttributes(this.webRequest,
ErrorAttributeOptions.defaults());
assertThat(this.errorAttributes.getError(this.webRequest)).isSameAs(ex);
assertThat(this.webRequest.getAttribute(ErrorAttributes.ERROR_ATTRIBUTE, WebRequest.SCOPE_REQUEST))
.isSameAs(ex);
assertThat(attributes).doesNotContainKey("exception");
assertThat(attributes).doesNotContainKey("message");
}
@ -161,6 +167,8 @@ class DefaultErrorAttributesTests {
Map<String, Object> attributes = this.errorAttributes.getErrorAttributes(this.webRequest,
ErrorAttributeOptions.of(Include.MESSAGE));
assertThat(this.errorAttributes.getError(this.webRequest)).isSameAs(wrapped);
assertThat(this.webRequest.getAttribute(ErrorAttributes.ERROR_ATTRIBUTE, WebRequest.SCOPE_REQUEST))
.isSameAs(wrapped);
assertThat(attributes).doesNotContainKey("exception");
assertThat(attributes.get("message")).isEqualTo("Test");
}
@ -172,6 +180,8 @@ class DefaultErrorAttributesTests {
Map<String, Object> attributes = this.errorAttributes.getErrorAttributes(this.webRequest,
ErrorAttributeOptions.of(Include.MESSAGE));
assertThat(this.errorAttributes.getError(this.webRequest)).isSameAs(error);
assertThat(this.webRequest.getAttribute(ErrorAttributes.ERROR_ATTRIBUTE, WebRequest.SCOPE_REQUEST))
.isSameAs(error);
assertThat(attributes).doesNotContainKey("exception");
assertThat(attributes.get("message")).isEqualTo("Test error");
}