1 files changed, 161 insertions, 0 deletions
diff --git a/src/cls/numops/cls_numops.cc b/src/cls/numops/cls_numops.cc
new file mode 100644
index 00000000..bccfd6d3
--- /dev/null
+++ b/src/cls/numops/cls_numops.cc
@@ -0,0 +1,161 @@
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2015 CERN
+ *
+ * Author: Joaquim Rocha <joaquim.rocha@cern.ch>
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ */
+
+/** \file
+ *
+ * This is an OSD class that implements methods for object numeric options on
+ * its omap values.
+ *
+ */
+
+#include "objclass/objclass.h"
+#include <errno.h>
+#include <string>
+#include <sstream>
+#include <cstdio>
+#include <include/compat.h>
+
+#define DECIMAL_PRECISION 10
+
+CLS_VER(1,0)
+CLS_NAME(numops)
+
+static int add(cls_method_context_t hctx, bufferlist *in, bufferlist *out)
+{
+  string key, diff_str;
+
+  auto iter = in->cbegin();
+  try {
+    decode(key, iter);
+    decode(diff_str, iter);
+  } catch (const buffer::error &err) {
+    CLS_LOG(20, "add: invalid decode of input");
+    return -EINVAL;
+  }
+
+  char *end_ptr = 0;
+  double difference = strtod(diff_str.c_str(), &end_ptr);
+
+  if (end_ptr && *end_ptr != '\0') {
+    CLS_ERR("add: invalid input value: %s", diff_str.c_str());
+    return -EINVAL;
+  }
+
+  bufferlist bl;
+  int ret = cls_cxx_map_get_val(hctx, key, &bl);
+
+  double value;
+
+  if (ret == -ENODATA || bl.length() == 0) {
+    value = 0;
+  } else if (ret < 0) {
+    if (ret != -ENOENT) {
+      CLS_ERR("add: error reading omap key %s: %d", key.c_str(), ret);
+    }
+    return ret;
+  } else {
+    std::string stored_value(bl.c_str(), bl.length());
+    end_ptr = 0;
+    value = strtod(stored_value.c_str(), &end_ptr);
+
+    if (end_ptr && *end_ptr != '\0') {
+      CLS_ERR("add: invalid stored value: %s", stored_value.c_str());
+      return -EBADMSG;
+    }
+  }
+
+  value += difference;
+
+  std::stringstream stream;
+  stream << std::setprecision(DECIMAL_PRECISION) << value;
+
+  bufferlist new_value;
+  new_value.append(stream.str());
+
+  return cls_cxx_map_set_val(hctx, key, &new_value);
+}
+
+static int mul(cls_method_context_t hctx, bufferlist *in, bufferlist *out)
+{
+  string key, diff_str;
+
+  auto iter = in->cbegin();
+  try {
+    decode(key, iter);
+    decode(diff_str, iter);
+  } catch (const buffer::error &err) {
+    CLS_LOG(20, "mul: invalid decode of input");
+    return -EINVAL;
+  }
+
+  char *end_ptr = 0;
+  double difference = strtod(diff_str.c_str(), &end_ptr);
+
+  if (end_ptr && *end_ptr != '\0') {
+    CLS_ERR("mul: invalid input value: %s", diff_str.c_str());
+    return -EINVAL;
+  }
+
+  bufferlist bl;
+  int ret = cls_cxx_map_get_val(hctx, key, &bl);
+
+  double value;
+
+  if (ret == -ENODATA || bl.length() == 0) {
+    value = 0;
+  } else if (ret < 0) {
+    if (ret != -ENOENT) {
+      CLS_ERR("mul: error reading omap key %s: %d", key.c_str(), ret);
+    }
+    return ret;
+  } else {
+    std::string stored_value(bl.c_str(), bl.length());
+    end_ptr = 0;
+    value = strtod(stored_value.c_str(), &end_ptr);
+
+    if (end_ptr && *end_ptr != '\0') {
+      CLS_ERR("mul: invalid stored value: %s", stored_value.c_str());
+      return -EBADMSG;
+    }
+  }
+
+  value *= difference;
+
+  std::stringstream stream;
+  stream << std::setprecision(DECIMAL_PRECISION) << value;
+
+  bufferlist new_value;
+  new_value.append(stream.str());
+
+  return cls_cxx_map_set_val(hctx, key, &new_value);
+}
+
+CLS_INIT(numops)
+{
+  CLS_LOG(20, "loading cls_numops");
+
+  cls_handle_t h_class;
+  cls_method_handle_t h_add;
+  cls_method_handle_t h_mul;
+
+  cls_register("numops", &h_class);
+
+  cls_register_cxx_method(h_class, "add",
+                          CLS_METHOD_RD | CLS_METHOD_WR,
+                          add, &h_add);
+
+  cls_register_cxx_method(h_class, "mul",
+                          CLS_METHOD_RD | CLS_METHOD_WR,
+                          mul, &h_mul);
+}