Implement SP wire protocolsp

Implements the SP wire protocol, and infrastructure for legacy wire
protocol support.

Also added an XS_SERVICE_ID socket option to set the service id and renamed
the XS_PROTOCOL option to XS_PATTERN_VERSION.

The following pattern versions are supported:

PAIR:     v3
PUBSUB:   v1 (legacy), v4
REQREP:   v2
PIPELINE: v3
SURVEY:   v2

Note that all existing pattern versions have been bumped by 1 to allow for
use of legacy protocols (otherwise there would be no way to distinguish
between e.g. PUBSUB v3 and PUBSUB v3 using SP).

Signed-off-by: Martin Lucina <martin@lucina.net>

1 files changed, 33 insertions, 0 deletions

diff --git a/src/push.cpp b/src/push.cpp
index 59f508f..729c97a 100644
--- a/src/push.cpp
+++ b/src/push.cpp
@@ -23,17 +23,50 @@
 #include "pipe.hpp"
 #include "err.hpp"
 #include "msg.hpp"
+#include "wire.hpp"
 
 xs::push_t::push_t (class ctx_t *parent_, uint32_t tid_, int sid_) :
     socket_base_t (parent_, tid_, sid_)
 {
     options.type = XS_PUSH;
+    options.sp_pattern = SP_PIPELINE;
+    options.sp_version = 3;
+    options.sp_role = SP_PIPELINE_PUSH;
+    options.sp_complement = SP_PIPELINE_PULL;
 }
 
 xs::push_t::~push_t ()
 {
 }
 
+int xs::push_t::xsetsockopt (int option_, const void *optval_,
+    size_t optvallen_)
+{
+    if (option_ != XS_PATTERN_VERSION) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    if (optvallen_ != sizeof (int)) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    if (!optval_) {
+        errno = EFAULT;
+        return -1;
+    }
+
+    int version = *(int *) optval_;
+    if (version != 2) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    options.sp_version = version;
+    return 0;
+}
+
 void xs::push_t::xattach_pipe (pipe_t *pipe_, bool icanhasall_)
 {
     xs_assert (pipe_);