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Avoid NPEs in DefaultServerRequestObservationConvention 

In some cases, the default response status of a `ServerWebExchange` can
be `null`, especially when the response is not available or the server
implementation does not set a default response status.
This commit ensures that the status code is available when deriving
`KeyValue` information from it, or uses a fallback value for the key
value.

Fixes gh-29359
This commit is contained in:
Brian Clozel 2022-10-20 14:29:34 +02:00
parent e749cd1ef1
commit fcbd5ec80a
2 changed files with 14 additions and 3 deletions
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7
spring-web/src/main/java/org/springframework/http/observation/reactive/DefaultServerRequestObservationConvention.java
View File

@ -100,7 +100,8 @@ public class DefaultServerRequestObservationConvention implements ServerRequestO
if (context.isConnectionAborted()) {
return STATUS_UNKNOWN;
}
return (context.getResponse() != null) ? KeyValue.of(ServerHttpObservationDocumentation.LowCardinalityKeyNames.STATUS, Integer.toString(context.getResponse().getStatusCode().value())) : STATUS_UNKNOWN;
return (context.getResponse() != null && context.getResponse().getStatusCode() != null) ?
KeyValue.of(ServerHttpObservationDocumentation.LowCardinalityKeyNames.STATUS, Integer.toString(context.getResponse().getStatusCode().value())) : STATUS_UNKNOWN;
}
protected KeyValue uri(ServerRequestObservationContext context) {
@ -112,7 +113,7 @@ public class DefaultServerRequestObservationConvention implements ServerRequestO
}
return KeyValue.of(ServerHttpObservationDocumentation.LowCardinalityKeyNames.URI, pattern.toString());
}
if (context.getResponse() != null) {
if (context.getResponse() != null && context.getResponse().getStatusCode() != null) {
HttpStatus status = HttpStatus.resolve(context.getResponse().getStatusCode().value());
if (status != null) {
if (status.is3xxRedirection()) {
@ -141,7 +142,7 @@ public class DefaultServerRequestObservationConvention implements ServerRequestO
if (context.isConnectionAborted()) {
return HTTP_OUTCOME_UNKNOWN;
}
if (context.getResponse() != null) {
if (context.getResponse() != null && context.getResponse().getStatusCode() != null) {
return HttpOutcome.forStatus(context.getResponse().getStatusCode());
}
return HTTP_OUTCOME_UNKNOWN;

10
spring-web/src/test/java/org/springframework/http/observation/reactive/DefaultServerRequestObservationConventionTests.java
View File

@ -141,6 +141,16 @@ class DefaultServerRequestObservationConventionTests {
.contains(KeyValue.of("http.url", "/test/resource"));
}
@Test
void supportsNullStatusCode() {
ServerWebExchange exchange = MockServerWebExchange.from(MockServerHttpRequest.get("/test/resource"));
ServerRequestObservationContext context = new ServerRequestObservationContext(exchange);
assertThat(this.convention.getLowCardinalityKeyValues(context))
.contains(KeyValue.of("status", "UNKNOWN"),
KeyValue.of("exception", "none"), KeyValue.of("outcome", "UNKNOWN"));
}
private static PathPattern getPathPattern(String pattern) {
PathPatternParser pathPatternParser = new PathPatternParser();
return pathPatternParser.parse(pattern);