yhs0092 commented on a change in pull request #702: [SCB-580] fix response of
the upload file too large
URL:
https://github.com/apache/incubator-servicecomb-java-chassis/pull/702#discussion_r188556614
##########
File path:
transports/transport-rest/transport-rest-vertx/src/main/java/org/apache/servicecomb/transport/rest/vertx/VertxRestDispatcher.java
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@@ -64,9 +70,106 @@ private void failureHandler(RoutingContext context) {
e = cause;
}
}
- restProducerInvocation.sendFailResponse(e);
- // 走到这里，应该都是不可控制的异常，直接关闭连接
+ // only when unexpected exception happens, it will run into here.
+ // the connection should be closed.
+ handleFailureAndClose(context, restProducerInvocation, e);
+ }
+
+ /**
+ * Try to find out the failure information and send it in response.
+ */
+ private void handleFailureAndClose(RoutingContext context,
AbstractRestInvocation restProducerInvocation,
+ Throwable e) {
+ if (null != restProducerInvocation) {
+ // if there is restProducerInvocation, let it send exception in
response. The exception is allowed to be null.
+ sendFailResponseByInvocation(context, restProducerInvocation, e);
+ return;
+ }
+
+ if (null != e) {
+ // if there exists exception, try to send this exception by
RoutingContext
+ sendExceptionByRoutingContext(context, e);
+ return;
+ }
+
+ // if there is no exception, the response is determined by status code.
+ sendFailureRespDeterminedByStatus(context);
+ }
+
+ /**
+ * Try to determine response by status code, and send response.
+ */
+ private void sendFailureRespDeterminedByStatus(RoutingContext context) {
+ Family statusFamily = Family.familyOf(context.statusCode());
+ if (Family.CLIENT_ERROR.equals(statusFamily) ||
Family.SERVER_ERROR.equals(statusFamily) || Family.OTHER
+ .equals(statusFamily)) {
+ context.response().putHeader(HttpHeaders.CONTENT_TYPE,
MediaType.WILDCARD)
+ .setStatusCode(context.statusCode()).end();
+ } else {
+ // it seems the status code is not set properly
+ context.response().putHeader(HttpHeaders.CONTENT_TYPE,
MediaType.WILDCARD)
+ .setStatusCode(Status.INTERNAL_SERVER_ERROR.getStatusCode())
+ .setStatusMessage(Status.INTERNAL_SERVER_ERROR.getReasonPhrase())
+
.end(wrapResponseBody(Status.INTERNAL_SERVER_ERROR.getReasonPhrase()));
+ }
+ context.response().close();
+ }
+
+ /**
+ * Use routingContext to send failure information in throwable.
+ */
+ private void sendExceptionByRoutingContext(RoutingContext context, Throwable
e) {
+ if (InvocationException.class.isInstance(e)) {
+ InvocationException invocationException = (InvocationException) e;
+ context.response().putHeader(HttpHeaders.CONTENT_TYPE,
MediaType.WILDCARD)
+
.setStatusCode(invocationException.getStatusCode()).setStatusMessage(invocationException.getReasonPhrase())
+ .end(wrapResponseBody(invocationException.getReasonPhrase()));
+ } else {
+ context.response().putHeader(HttpHeaders.CONTENT_TYPE,
MediaType.WILDCARD)
+
.setStatusCode(Status.INTERNAL_SERVER_ERROR.getStatusCode()).end(wrapResponseBody(e.getMessage()));
+ }
+ context.response().close();
+ }
+
+ /**
+ * Consumer will treat the response body as json by default, so it's
necessary to wrap response body as Json string
+ * to avoid deserialization error.
+ *
+ * @param message response body
+ * @return response body wrapped as Json string
+ */
+ String wrapResponseBody(String message) {
+ if (isValidJson(message)) {
+ return message;
+ }
+
+ JsonObject jsonObject = new JsonObject();
+ jsonObject.put("message", message);
+
+ return jsonObject.toString();
Review comment:
Actually I have no idea about what kind of Json response should be written.
But I find out that currently we wrap exception and write response like below,
so I copy this pattern.
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