fixes #44 open protocol by "name" (symbol) instead number

fixes #38 Make protocols "pluggable", or at least optional

This is a breaking change, as we've done away with the central
registered list of protocols, and instead demand the user call
nng_xxx_open() where xxx is a protocol name.  (We did keep a
table around in the compat framework though.)

There is a nice way for protocols to plug in via
an nni_proto_open(), where they can use a generic constructor
that they use to build a protocol specific constructor (passing
their ops vector in.)

2 files changed, 18 insertions, 8 deletions

diff --git a/src/protocol/survey/respond.c b/src/protocol/survey/respond.c
index 089e730e..4db79b86 100644
--- a/src/protocol/survey/respond.c
+++ b/src/protocol/survey/respond.c
@@ -504,10 +504,16 @@ static nni_proto_sock_ops nni_resp_sock_ops = {
 };
 
 nni_proto nni_respondent_proto = {
-	.proto_self     = NNG_PROTO_RESPONDENT,
-	.proto_peer     = NNG_PROTO_SURVEYOR,
-	.proto_name     = "respondent",
+	.proto_version  = NNI_PROTOCOL_VERSION,
+	.proto_self     = { NNG_PROTO_RESPONDENT_V0, "respondent" },
+	.proto_peer     = { NNG_PROTO_SURVEYOR_V0, "surveyor" },
 	.proto_flags    = NNI_PROTO_FLAG_SNDRCV,
 	.proto_sock_ops = &nni_resp_sock_ops,
 	.proto_pipe_ops = &nni_resp_pipe_ops,
 };
+
+int
+nng_respondent0_open(nng_socket *sidp)
+{
+	return (nni_proto_open(sidp, &nni_respondent_proto));
+}
diff --git a/src/protocol/survey/survey.c b/src/protocol/survey/survey.c
index 633e1491..91fe4ad3 100644
--- a/src/protocol/survey/survey.c
+++ b/src/protocol/survey/survey.c
@@ -470,13 +470,17 @@ static nni_proto_sock_ops nni_surv_sock_ops = {
 	.sock_sfilter = nni_surv_sock_sfilter,
 };
 
-// This is the global protocol structure -- our linkage to the core.
-// This should be the only global non-static symbol in this file.
 nni_proto nni_surveyor_proto = {
-	.proto_self     = NNG_PROTO_SURVEYOR,
-	.proto_peer     = NNG_PROTO_RESPONDENT,
-	.proto_name     = "surveyor",
+	.proto_version  = NNI_PROTOCOL_VERSION,
+	.proto_self     = { NNG_PROTO_SURVEYOR_V0, "surveyor" },
+	.proto_peer     = { NNG_PROTO_RESPONDENT_V0, "respondent" },
 	.proto_flags    = NNI_PROTO_FLAG_SNDRCV,
 	.proto_sock_ops = &nni_surv_sock_ops,
 	.proto_pipe_ops = &nni_surv_pipe_ops,
 };
+
+int
+nng_surveyor0_open(nng_socket *sidp)
+{
+	return (nni_proto_open(sidp, &nni_surveyor_proto));
+}