// handleCallMessage is run in the coordinate goroutine to handle a
// received call message. It mutates the capability table of its
// parameter.
func (c *Conn) handleCallMessage(m rpccapnp.Message) error {
mcall, err := m.Call()
if err != nil {
return err
}
mt, err := mcall.Target()
if err != nil {
return err
}
if mt.Which() != rpccapnp.MessageTarget_Which_importedCap && mt.Which() != rpccapnp.MessageTarget_Which_promisedAnswer {
um := newUnimplementedMessage(nil, m)
return c.sendMessage(um)
}
mparams, err := mcall.Params()
if err != nil {
return err
}
if err := c.populateMessageCapTable(mparams); err == errUnimplemented {
um := newUnimplementedMessage(nil, m)
return c.sendMessage(um)
} else if err != nil {
c.abort(err)
return err
}
ctx, cancel := c.newContext()
id := answerID(mcall.QuestionId())
a := c.answers.insert(id, cancel)
if a == nil {
// Question ID reused, error out.
c.abort(errQuestionReused)
return errQuestionReused
}
meth := capnp.Method{
InterfaceID: mcall.InterfaceId(),
MethodID: mcall.MethodId(),
}
paramContent, err := mparams.Content()
if err != nil {
return err
}
cl := &capnp.Call{
Ctx: ctx,
Method: meth,
Params: capnp.ToStruct(paramContent),
}
if err := c.routeCallMessage(a, mt, cl); err != nil {
msgs := a.reject(nil, err)
for _, m := range msgs {
if err := c.sendMessage(m); err != nil {
return err
}
}
return nil
}
return nil
}
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())
}
}