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stats: add comments about why out headers and out trailers have no wire length (#3408)

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This commit is contained in:
Matthew Dolan
2020-03-10 09:15:28 -07:00
committed by GitHub
parent 9a1081e29e
commit 5c17da6907
4 changed files with 13 additions and 2 deletions
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4
internal/transport/handler_server.go
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@ -227,6 +227,8 @@ func (ht *serverHandlerTransport) WriteStatus(s *Stream, st *status.Status) erro
if err == nil { // transport has not been closed
if ht.stats != nil {
// Note: The trailer fields are compressed with hpack after this call returns.
// No WireLength field is set here.
ht.stats.HandleRPC(s.Context(), &stats.OutTrailer{
Trailer: s.trailer.Copy(),
})
@ -291,6 +293,8 @@ func (ht *serverHandlerTransport) WriteHeader(s *Stream, md metadata.MD) error {
if err == nil {
if ht.stats != nil {
// Note: The header fields are compressed with hpack after this call returns.
// No WireLength field is set here.
ht.stats.HandleRPC(s.Context(), &stats.OutHeader{
Header: md.Copy(),
})

2
internal/transport/http2_client.go
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@ -686,6 +686,8 @@ func (t *http2Client) NewStream(ctx context.Context, callHdr *CallHdr) (_ *Strea
} else {
header = metadata.Pairs("user-agent", t.userAgent)
}
// Note: The header fields are compressed with hpack after this call returns.
// No WireLength field is set here.
outHeader := &stats.OutHeader{
Client: true,
FullMethod: callHdr.Method,

6
internal/transport/http2_server.go
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@ -813,8 +813,8 @@ func (t *http2Server) writeHeaderLocked(s *Stream) error {
return ErrHeaderListSizeLimitViolation
}
if t.stats != nil {
// Note: WireLength is not set in outHeader.
// TODO(mmukhi): Revisit this later, if needed.
// Note: Headers are compressed with hpack after this call returns.
// No WireLength field is set here.
outHeader := &stats.OutHeader{
Header: s.header.Copy(),
}
@ -880,6 +880,8 @@ func (t *http2Server) WriteStatus(s *Stream, st *status.Status) error {
rst := s.getState() == streamActive
t.finishStream(s, rst, http2.ErrCodeNo, trailingHeader, true)
if t.stats != nil {
// Note: The trailer fields are compressed with hpack after this call returns.
// No WireLength field is set here.
t.stats.HandleRPC(s.Context(), &stats.OutTrailer{
Trailer: s.trailer.Copy(),
})

3
stats/stats.go
View File

@ -165,6 +165,9 @@ type OutTrailer struct {
// Client is true if this OutTrailer is from client side.
Client bool
// WireLength is the wire length of trailer.
//
// Deprecated: This field is never set. The length is not known when this message is
// emitted because the trailer fields are compressed with hpack after that.
WireLength int
// Trailer contains the trailer metadata sent to the client. This
// field is only valid if this OutTrailer is from the server side.