func formatMsg(w io.Writer, m rpccapnp.Message) {
switch m.Which() {
case rpccapnp.Message_Which_unimplemented:
fmt.Fprint(w, "unimplemented")
case rpccapnp.Message_Which_abort:
mabort, _ := m.Abort()
reason, _ := mabort.Reason()
fmt.Fprintf(w, "abort type=%v: %s", mabort.Type(), reason)
case rpccapnp.Message_Which_bootstrap:
mboot, _ := m.Bootstrap()
fmt.Fprintf(w, "bootstrap id=%d", mboot.QuestionId())
case rpccapnp.Message_Which_call:
c, _ := m.Call()
fmt.Fprintf(w, "call id=%d target=<", c.QuestionId())
tgt, _ := c.Target()
formatMessageTarget(w, tgt)
fmt.Fprintf(w, "> @%#x/@%d", c.InterfaceId(), c.MethodId())
case rpccapnp.Message_Which_return:
r, _ := m.Return()
fmt.Fprintf(w, "return id=%d", r.AnswerId())
if r.ReleaseParamCaps() {
fmt.Fprint(w, " releaseParamCaps")
}
switch r.Which() {
case rpccapnp.Return_Which_results:
case rpccapnp.Return_Which_exception:
exc, _ := r.Exception()
reason, _ := exc.Reason()
fmt.Fprintf(w, ", exception type=%v: %s", exc.Type(), reason)
case rpccapnp.Return_Which_canceled:
fmt.Fprint(w, ", canceled")
case rpccapnp.Return_Which_resultsSentElsewhere:
fmt.Fprint(w, ", results sent elsewhere")
case rpccapnp.Return_Which_takeFromOtherQuestion:
fmt.Fprint(w, ", results sent elsewhere")
case rpccapnp.Return_Which_acceptFromThirdParty:
fmt.Fprint(w, ", accept from third party")
default:
fmt.Fprintf(w, ", UNKNOWN RESULT which=%v", r.Which())
}
case rpccapnp.Message_Which_finish:
fin, _ := m.Finish()
fmt.Fprintf(w, "finish id=%d", fin.QuestionId())
if fin.ReleaseResultCaps() {
fmt.Fprint(w, " releaseResultCaps")
}
case rpccapnp.Message_Which_resolve:
r, _ := m.Resolve()
fmt.Fprintf(w, "resolve id=%d ", r.PromiseId())
switch r.Which() {
case rpccapnp.Resolve_Which_cap:
fmt.Fprint(w, "capability=")
c, _ := r.Cap()
formatCapDescriptor(w, c)
case rpccapnp.Resolve_Which_exception:
exc, _ := r.Exception()
reason, _ := exc.Reason()
fmt.Fprintf(w, "exception type=%v: %s", exc.Type(), reason)
default:
fmt.Fprintf(w, "UNKNOWN RESOLUTION which=%v", r.Which())
}
case rpccapnp.Message_Which_release:
rel, _ := m.Release()
fmt.Fprintf(w, "release id=%d by %d", rel.Id(), rel.ReferenceCount())
case rpccapnp.Message_Which_disembargo:
de, _ := m.Disembargo()
tgt, _ := de.Target()
fmt.Fprint(w, "disembargo <")
formatMessageTarget(w, tgt)
fmt.Fprint(w, "> ")
dc := de.Context()
switch dc.Which() {
case rpccapnp.Disembargo_context_Which_senderLoopback:
fmt.Fprintf(w, "sender loopback id=%d", dc.SenderLoopback())
case rpccapnp.Disembargo_context_Which_receiverLoopback:
fmt.Fprintf(w, "receiver loopback id=%d", dc.ReceiverLoopback())
case rpccapnp.Disembargo_context_Which_accept:
fmt.Fprint(w, "accept")
case rpccapnp.Disembargo_context_Which_provide:
fmt.Fprintf(w, "provide id=%d", dc.Provide())
default:
fmt.Fprintf(w, "UNKNOWN CONTEXT which=%v", dc.Which())
}
case rpccapnp.Message_Which_obsoleteSave:
fmt.Fprint(w, "save")
case rpccapnp.Message_Which_obsoleteDelete:
fmt.Fprint(w, "delete")
case rpccapnp.Message_Which_provide:
prov, _ := m.Provide()
tgt, _ := prov.Target()
fmt.Fprintf(w, "provide id=%d <", prov.QuestionId())
formatMessageTarget(w, tgt)
fmt.Fprint(w, ">")
case rpccapnp.Message_Which_accept:
acc, _ := m.Accept()
fmt.Fprintf(w, "accept id=%d", acc.QuestionId())
if acc.Embargo() {
fmt.Fprint(w, " with embargo")
}
case rpccapnp.Message_Which_join:
join, _ := m.Join()
tgt, _ := join.Target()
fmt.Fprintf(w, "join id=%d <", join.QuestionId())
formatMessageTarget(w, tgt)
fmt.Fprint(w, ">")
default:
fmt.Fprintf(w, "UNKNOWN MESSAGE which=%v", m.Which())
}
}
// handleReturnMessage is run in the coordinate goroutine.
func (c *Conn) handleReturnMessage(m rpccapnp.Message) error {
ret, err := m.Return()
if err != nil {
return err
}
id := questionID(ret.AnswerId())
q := c.questions.pop(id)
if q == nil {
return fmt.Errorf("received return for unknown question id=%d", id)
}
if ret.ReleaseParamCaps() {
c.exports.releaseList(q.paramCaps)
}
if _, _, _, resolved := q.peek(); resolved {
// If the question was already resolved, that means it was canceled,
// in which case we already sent the finish message.
return nil
}
releaseResultCaps := true
switch ret.Which() {
case rpccapnp.Return_Which_results:
releaseResultCaps = false
results, err := ret.Results()
if err != nil {
return err
}
if err := c.populateMessageCapTable(results); err == errUnimplemented {
um := newUnimplementedMessage(nil, m)
c.sendMessage(um)
return errUnimplemented
} else if err != nil {
c.abort(err)
return err
}
content, err := results.Content()
if err != nil {
return err
}
disembargoes := q.fulfill(content, c.embargoes.new)
for _, d := range disembargoes {
if err := c.sendMessage(d); err != nil {
// shutdown
return nil
}
}
case rpccapnp.Return_Which_exception:
exc, err := ret.Exception()
if err != nil {
return err
}
e := error(Exception{exc})
if q.method != nil {
e = &capnp.MethodError{
Method: q.method,
Err: e,
}
} else {
e = bootstrapError{e}
}
q.reject(questionResolved, e)
case rpccapnp.Return_Which_canceled:
err := &questionError{
id: id,
method: q.method,
err: fmt.Errorf("receiver reported canceled"),
}
log.Println(err)
q.reject(questionResolved, err)
return nil
default:
um := newUnimplementedMessage(nil, m)
c.sendMessage(um)
return errUnimplemented
}
fin := newFinishMessage(nil, id, releaseResultCaps)
c.sendMessage(fin)
return nil
}