common/formattable: initial work

initial work on a dict-like api

Signed-off-by: Yehuda Sadeh <yehuda@redhat.com>

diff --git a/src/rgw/rgw_admin.cc b/src/rgw/rgw_admin.cc
index 7b97e77a18a017ff73a13672bfd1f35db8766aab..37546ddfef7190b677c73da9cddea2bd0cf5d662 100644 (file)
--- a/src/rgw/rgw_admin.cc
+++ b/src/rgw/rgw_admin.cc
@@ -2448,6 +2448,77 @@ static int scan_totp(CephContext *cct, ceph::real_time& now, rados::cls::otp::ot
   return -ENOENT;
 }
 
+struct Formattable {
+  enum Type {
+    FMT_NONE,
+    FMT_STRING,
+    FMT_ARRAY,
+    FMT_OBJ,
+  } type{FMT_NONE};
+  string str;
+  vector<Formattable> arr;
+  map<string, Formattable> obj;
+
+  void decode_json(JSONObj *jo) {
+    if (jo->is_array()) {
+      type = Formattable::FMT_ARRAY;
+      decode_json_obj(arr, jo);
+    } else if (jo->is_object()) {
+      type = Formattable::FMT_OBJ;
+      auto iter = jo->find_first();
+      while (!iter.end()) {
+        JSONObj *field;
+        decode_json_obj(obj[field->get_name()], field);
+      }
+    } else {
+      type = Formattable::FMT_STRING;
+      decode_json_obj(str, jo);
+    }
+  }
+
+  const string& val() const {
+    return str;
+  }
+
+  const vector<Formattable>& array() const {
+    return arr;
+  }
+
+  const Formattable& operator[](const string& name) const;
+};
+
+static Formattable default_formattable;
+
+const Formattable& Formattable::operator[](const string& name) const {
+  auto i = obj.find(name);
+  if (i == obj.end()) {
+    return default_formattable;
+  }
+  return i->second;
+}
+
+void encode_json(const char *name, const Formattable& v, Formatter *f)
+{
+  switch (v.type) {
+    case Formattable::FMT_STRING:
+      encode_json(name, v.str, f);
+      break;
+    case Formattable::FMT_ARRAY:
+      encode_json(name, v.arr, f);
+      break;
+    case Formattable::FMT_OBJ:
+      f->open_object_section(name);
+      for (auto iter : v.obj) {
+        encode_json(iter.first.c_str(), iter.second, f);
+      }
+      f->close_section();
+      break;
+    case Formattable::FMT_NONE:
+      break;
+  }
+}
+
+
 #ifdef BUILDING_FOR_EMBEDDED
 extern "C" int cephd_rgw_admin(int argc, const char **argv)
 #else