lua: provide cls_lua_client library

Provides an interface that doesn't depend on Ceph encoding for users
outside of the Ceph source tree.

Signed-off-by: Noah Watkins <noahwatkins@gmail.com>

3 files changed, 78 insertions, 0 deletions

diff --git a/src/Makefile.am b/src/Makefile.am
index f811ca22045..53ba26adfb9 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -483,6 +483,13 @@ rados_SOURCES = rados.cc rados_import.cc rados_export.cc rados_sync.cc common/ob
 rados_LDADD = libcls_lock_client.a librados.la $(LIBGLOBAL_LDA)
 bin_PROGRAMS += rados
 
+libcls_lua_client_la_SOURCES = \
+	cls/lua/cls_lua_client.cc \
+	cls/lua/cls_lua_client.hpp
+libcls_lua_client_la_CXXFLAGS = ${AM_CXXFLAGS}
+libcls_lua_client_la_LIBADD = librados.la
+lib_LTLIBRARIES += libcls_lua_client.la
+
 if WITH_REST_BENCH
 
 rest_bench_SOURCES = tools/rest_bench.cc common/obj_bencher.cc
@@ -1472,6 +1479,10 @@ rados_include_DATA = \
 	$(srcdir)/include/page.h \
 	$(srcdir)/include/crc32c.h
 
+libcls_lua_client_includedir = $(includedir)/cls_lua
+libcls_lua_client_include_DATA = \
+	$(srcdir)/cls/lua/cls_lua_client.hpp
+
 #crush_includedir = $(includedir)/crush
 #crush_include_DATA = \
 #	$(srcdir)/crush/hash.h \
diff --git a/src/cls/lua/cls_lua_client.cc b/src/cls/lua/cls_lua_client.cc
new file mode 100644
index 00000000000..fef12b2b084
--- /dev/null
+++ b/src/cls/lua/cls_lua_client.cc
@@ -0,0 +1,47 @@
+#include <errno.h>
+#include <string>
+#include <vector>
+#include "include/encoding.h"
+#include "include/rados.h"
+#include "include/rados/librados.h"
+#include "include/types.h"
+#include "cls_lua.h"
+#include "cls_lua_client.hpp"
+
+using std::string;
+using std::vector;
+using librados::IoCtx;
+using librados::bufferlist;
+
+namespace cls_lua_client {
+
+  int exec(IoCtx& ioctx, const string& oid, const string& script,
+      const string& handler, bufferlist& input, bufferlist& output,
+      vector<string> *log)
+  {
+    struct clslua_cmd cmd;
+    struct clslua_reply reply;
+    bufferlist outbl, inbl;
+    int ret;
+
+    cmd.script = script;
+    cmd.funcname = handler;
+    cmd.input = input;
+    ::encode(cmd, inbl);
+
+    ret = ioctx.exec(oid, "lua", "eval", inbl, outbl);
+
+    try {
+      ::decode(reply, outbl);
+    } catch (const buffer::error &err) {
+      return -EBADMSG;
+    }
+
+    output = reply.output;
+    if (log)
+      log->swap(reply.log);
+
+    return ret;
+  }
+
+}
diff --git a/src/cls/lua/cls_lua_client.hpp b/src/cls/lua/cls_lua_client.hpp
new file mode 100644
index 00000000000..64c7e4f6edd
--- /dev/null
+++ b/src/cls/lua/cls_lua_client.hpp
@@ -0,0 +1,20 @@
+#ifndef CLS_LUA_CLIENT_HPP
+#define CLS_LUA_CLIENT_HPP
+#include <string>
+#include <vector>
+
+#ifdef __CEPH__
+#include "include/rados/librados.hpp"
+#else
+# include <rados/librados.hpp>
+#endif
+
+namespace cls_lua_client {
+
+  int exec(librados::IoCtx& ioctx, const std::string& oid,
+      const std::string& script, const std::string& handler,
+      librados::bufferlist& inbl, librados::bufferlist& outbl,
+      std::vector<std::string> *log = NULL);
+}
+
+#endif