From 6432cead1941d5305bc2d7f22821ca8a98f43f78 Mon Sep 17 00:00:00 2001
From: Laurent Bercot <ska-skaware@skarnet.org>
Date: Fri, 24 Nov 2017 18:54:03 +0000
Subject:  Add skabus-rpc-daemon, skabus-rpcd and the skabus_rpc library

---
 src/libskabus/skabus_rpc_send_cb.c | 53 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 src/libskabus/skabus_rpc_send_cb.c

(limited to 'src/libskabus/skabus_rpc_send_cb.c')

diff --git a/src/libskabus/skabus_rpc_send_cb.c b/src/libskabus/skabus_rpc_send_cb.c
new file mode 100644
index 0000000..7aa7fbc
--- /dev/null
+++ b/src/libskabus/skabus_rpc_send_cb.c
@@ -0,0 +1,53 @@
+/* ISC license. */
+
+#include <sys/uio.h>
+#include <errno.h>
+#include <skalibs/uint64.h>
+#include <skalibs/error.h>
+#include <skalibs/gensetdyn.h>
+#include <skalibs/avltree.h>
+#include <skalibs/unixmessage.h>
+#include <skalibs/skaclient.h>
+#include <skabus/rpc.h>
+#include "skabus-rpc-internal.h"
+
+static int autocancel_cb (unixmessage_t const *m, void *p)
+{
+  (void)m ;
+  (void)p ;
+  return 1 ;
+}
+
+int skabus_rpc_send_cb (unixmessage_t const *m, void *p)
+{
+  skabus_rpc_send_result_t *r = p ;
+  skabus_rpc_qinfo_t *info = GENSETDYN_P(skabus_rpc_qinfo_t, &r->a->q, r->i) ;
+  if (!m->len) return (errno = EPROTO, 0) ;
+  if (m->s[0])
+  {
+    r->err = m->s[0] ;
+    r->u = 0 ;
+    info->status = EINVAL ;
+    gensetdyn_delete(&r->a->q, r->i) ;
+    return 1 ;
+  }
+  if (m->len != 9) return (errno = EPROTO, 0) ;
+  uint64_unpack_big(m->s+1, &info->serial) ;
+  if (!avltree_insert(&r->a->qmap, r->i))
+  {
+   /* the client can't store the info but the server is performing the query,
+      so we try to send a stealthy cancel */
+    char what = 'C' ;
+    struct iovec v[2] = { { .iov_base = &what, .iov_len = 1 }, { .iov_base = m->s + 1, .iov_len = 8 } } ;
+    r->err = errno ;
+    r->u = 0 ;
+    info->status = EINVAL ;
+    gensetdyn_delete(&r->a->q, r->i) ;
+    if (skaclient_putv(&r->a->connection, v, 2, &autocancel_cb, 0))
+      skaclient_flush(&r->a->connection) ;
+    return 1 ;
+  }
+  r->u = info->serial ;
+  info->status = EBUSY ;
+  return 1 ;
+}
-- 
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