When an error implemented by the status package is returned from a service
handler, the server will transmit a rich status message in the
"grpc-status-details-bin" trailing metadata field if any detailed data is
attached to the error. Client-side, we will decode them if present in the
server's response and return them to the user code performing the RPC.
This is backward compatible with the existing errors supported by the grpc
package. However, the grpc.Errorf, grpc.Code and grpc.ErrorDesc functions for
managing errors are now deprecated; status.Errorf and status.Status type
asserions should be used instead.
* Add the initial service config support
* start scWatcher later
* remove timeoutCh
* address the comments
* deal with dial timeout
* defer cancel for the newly created context for correct lifetime management
* fix the defer order
* added other 2 missing cancels
* add stats.tagger APIs and connection stats.
* fix comments
use ac.ctx in http2client
change name and comments
small fixes stats_tests
* add a TODO to ConnTagInfo
* rename handle to handleRPC
* modify stats comments
The http.Handler-based transport body reader was returning error types
not understood by the recvMsg parser. See #557 for some background and
examples.
Fix the http.Handler transport and add tests. I copied in a subset of
the http2 package's serverTest type, adapted slightly to work with
grpc. In the process of adding tests, I discovered that
ErrUnexpectedEOF was also not handled by the regular server
transport. Document the rules and fix that crash as well.
Unrelated stuff in this CL:
* make tests listen on localhost:0 instead of :0, to avoid Mac firewall
pop-up dialogs.
* rename parser.s field to parser.r, to be more idiomatic that it's an
io.Reader and not anything fancier. (it's not acting like type
stream, even if that's the typical concrete type)
* move 5 byte temp buffer into parser, rather than allocating it for
each new message. (drop in the bucket improvement in garbage; more
to do later)
* rename http2RSTErrConvTab to http2ErrConvTab, per Qi's earlier
CL. Also add the HTTP/1.1-required error mapping for completeness,
not that it should ever arise with gRPC, also per Qi's earlier CL
referenced in #557.
