[tarantool-patches] [PATCH v1 08/10] box: add method dump_lua to port

[imeevma@tarantool.org]

New method dump_lua dumps saved in port tuples to Lua stack. It
will allow us to call this method from vstream without any other
interaction with port.

Needed for #3505
---
 src/box/lua/call.c |  1 +
 src/box/port.c     | 22 ++++++++++++++++++++++
 src/box/port.h     | 12 ++++++++++++
 3 files changed, 35 insertions(+)

diff --git a/src/box/lua/call.c b/src/box/lua/call.c
index 1f20426..52939ae 100644
--- a/src/box/lua/call.c
+++ b/src/box/lua/call.c
@@ -424,6 +424,7 @@ port_lua_dump_plain(struct port *port, uint32_t *size);
 static const struct port_vtab port_lua_vtab = {
 	.dump_msgpack = port_lua_dump,
 	.dump_msgpack_16 = port_lua_dump_16,
+	.dump_lua = NULL,
 	.dump_plain = port_lua_dump_plain,
 	.destroy = port_lua_destroy,
 };
diff --git a/src/box/port.c b/src/box/port.c
index 266cf3d..a65a32d 100644
--- a/src/box/port.c
+++ b/src/box/port.c
@@ -36,6 +36,8 @@
 #include <small/mempool.h>
 #include <fiber.h>
 #include "errinj.h"
+#include "lua/utils.h"
+#include "lua/tuple.h"
 
 static struct mempool port_tuple_entry_pool;
 
@@ -121,6 +123,19 @@ port_tuple_dump_msgpack(struct port *base, struct obuf *out)
 	return 1;
 }
 
+static int
+port_tuple_dump_lua(struct port *base, struct lua_State *L)
+{
+	struct port_tuple *port = port_tuple(base);
+	struct port_tuple_entry *pe;
+	int i = 0;
+	for (pe = port->first; pe != NULL; pe = pe->next) {
+		luaT_pushtuple(L, pe->tuple);
+		lua_rawseti(L, -2, ++i);
+	}
+	return port->size;
+}
+
 void
 port_destroy(struct port *port)
 {
@@ -139,6 +154,12 @@ port_dump_msgpack_16(struct port *port, struct obuf *out)
 	return port->vtab->dump_msgpack_16(port, out);
 }
 
+int
+port_dump_lua(struct port *port, struct lua_State *L)
+{
+	return port->vtab->dump_lua(port, L);
+}
+
 const char *
 port_dump_plain(struct port *port, uint32_t *size)
 {
@@ -161,6 +182,7 @@ port_free(void)
 const struct port_vtab port_tuple_vtab = {
 	.dump_msgpack = port_tuple_dump_msgpack,
 	.dump_msgpack_16 = port_tuple_dump_msgpack_16,
+	.dump_lua = port_tuple_dump_lua,
 	.dump_plain = NULL,
 	.destroy = port_tuple_destroy,
 };
diff --git a/src/box/port.h b/src/box/port.h
index 882bb37..3bd83b0 100644
--- a/src/box/port.h
+++ b/src/box/port.h
@@ -78,6 +78,11 @@ struct port_vtab {
 	 */
 	int (*dump_msgpack_16)(struct port *port, struct obuf *out);
 	/**
+	 * Dump the content of a port to Lua stack.
+	 * On success returns number of entries dumped.
+	 */
+	int (*dump_lua)(struct port *port, struct lua_State *L);
+	/**
 	 * Dump a port content as a plain text into a buffer,
 	 * allocated inside.
 	 */
@@ -185,6 +190,13 @@ int
 port_dump_msgpack_16(struct port *port, struct obuf *out);
 
 /**
+ * Same as port_dump(), but use the legacy Tarantool 1.6
+ * format.
+ */
+int
+port_dump_lua(struct port *port, struct lua_State *L);
+
+/**
  * Dump a port content as a plain text into a buffer,
  * allocated inside.
  * @param port Port with data to dump.
-- 
2.7.4