server: fix a few issues where grpc server uses RST_STREAM for non-HTTP/2 errors #5893

jhump · 2022-12-23T18:12:48Z

In addition to the 415 for an unsupported content-type, this also has the server respond with a 400 in the face of malformed application header values (invalid grpc-timeout, invalid base64-encoded binary header). The NewServerHandlerTransport function (for using the server with existing net/http server) already handled such requests this way. So now they behave consistently.

Fixes #5892

RELEASE NOTES:

server: fix a few issues where grpc server uses RST_STREAM for non-HTTP/2 errors

…l errors

easwars · 2022-12-27T20:02:05Z

Also, do you mind adding tests for the behavior changes.

And, is there a reason the PR is in draft?

github-actions · 2023-01-02T20:45:56Z

This PR is labeled as requiring an update from the reporter, and no update has been received after 6 days. If no update is provided in the next 7 days, this issue will be automatically closed.

jhump · 2023-01-03T15:56:40Z

And, is there a reason the PR is in draft?

@easwars, I was getting tests green and trying to figure out how to write new tests for this. It looks like there isn't much of a test fixture for this part of the code, so new tests will have a bit of setup boiler-plate. (If I'm wrong, please point me at an existing test that does similar setup as I'll need.)

easwars · 2023-01-03T20:27:09Z

grpc-go/internal/transport/transport_test.go

Line 1884 in f2fbb0e

func (s) TestHeadersHTTPStatusGRPCStatus(t *testing.T) {

is one of the tests which verifies the returned status code. Maybe you can add to that?

jhump · 2023-01-03T23:07:37Z

@easwars, thanks for the pointer! I've added new test cases and this PR is no longer a draft.

jhump · 2023-01-11T14:31:34Z

@easwars, will you have time to review this PR this week?

internal/transport/handler_server_test.go

internal/transport/http2_server.go

easwars · 2022-12-27T20:00:43Z

internal/transport/http2_server.go

@@ -445,8 +447,8 @@ func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(
 		if logger.V(logLevel) {
 			logger.Errorf("transport: %v", errMsg)
 		}
-		t.controlBuf.put(&earlyAbortStream{
-			httpStatus:     400,
+		_ = t.controlBuf.put(&earlyAbortStream{


Why is it required to assign the return value to a blank identifier instead of ignoring it? Here and other places in this PR.

My IDE warns about code that ignores errors, which is what this function returns. This is a common analysis in CI (via tools like errcheck), to prevent mistakes where code forgets to check errors. So I added the _ = to make it explicit that I am ignoring the returned error (which suppresses the yellow indicator in GoLand).

I am happy to undo this if you want.

We generally don't prefer the _ = option. If and where it makes sense, we prefer adding a small comment saying why it is safe to ignore the error. So, if you could do that, that would be great.

internal/transport/http2_server.go

easwars · 2023-01-11T19:54:35Z

internal/transport/transport_test.go

-			t.Fatalf("Client failed to dial: %v", err)
-		}
-		defer mconn.Close()
+		t.Run(test.name, func(t *testing.T) {


Did you change anything at all in this test's logic, or is it just indentation change because of adding a t.Run()?

Just indenting. You can confirm by hiding whitespace changes in the diff:

The only other change was augmenting the error message on line 2061.

easwars · 2023-01-11T19:55:06Z

@easwars, will you have time to review this PR this week?

Apologies for the delay. Holidays and sickness to blame.

jhump · 2023-01-11T21:21:19Z

Apologies for the delay. Holidays and sickness to blame.

@easwars, no problem! I hope you're feeling better. And Happy New Year!

I think I've answered your questions and pushed a change to address one of them.

github-actions · 2023-01-17T22:45:46Z

This PR is labeled as requiring an update from the reporter, and no update has been received after 6 days. If no update is provided in the next 7 days, this issue will be automatically closed.

easwars

I think the changes look fine. Could you please handle the blank identifier assignment please.

easwars · 2023-01-18T00:19:25Z

internal/transport/http2_server.go

@@ -445,8 +447,8 @@ func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(
 		if logger.V(logLevel) {
 			logger.Errorf("transport: %v", errMsg)
 		}
-		t.controlBuf.put(&earlyAbortStream{
-			httpStatus:     400,
+		_ = t.controlBuf.put(&earlyAbortStream{


We generally don't prefer the _ = option. If and where it makes sense, we prefer adding a small comment saying why it is safe to ignore the error. So, if you could do that, that would be great.

internal/transport/http2_server.go

easwars · 2023-01-18T00:25:20Z

Adding @dfawley for second set of eyes and another ping on #5893 (comment).

dfawley

Thank you for the fix! One comment about condition ordering, otherwise LGTM.

dfawley · 2023-01-18T17:52:48Z

internal/transport/http2_server.go

+		})
+		return nil
+	}
+	if !isGRPC {


It seems to me like this should come first -- why complain about the syntax of some grpc headers if the other side isn't even speaking grpc?

Good point! Fixed.

…r is malformed

dfawley

Thanks!

fix a few issues where grpc server resets stream even for non-protoco…

7ad59b0

…l errors

jhump marked this pull request as draft December 23, 2022 20:48

update tests

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add new tests to verify changed behavior

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always check http status code in test

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remove '_ = ...' idiom

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fail with 415 if content-type is bad, even if timeout or binary heade…

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dfawley changed the title ~~fix a few issues where grpc server resets stream even for non-protocol errors~~ server: fix a few issues where grpc server uses RST_STREAM for non-HTTP/2 errors Jan 18, 2023

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server: fix a few issues where grpc server uses RST_STREAM for non-HTTP/2 errors #5893

server: fix a few issues where grpc server uses RST_STREAM for non-HTTP/2 errors #5893

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server: fix a few issues where grpc server uses RST_STREAM for non-HTTP/2 errors #5893

server: fix a few issues where grpc server uses RST_STREAM for non-HTTP/2 errors #5893

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