Code refactory to use protobuf message Attributes. (envoyproxy#232)

* Refactory to use protobuf Attributes.

* add new files.

* Change to use pointer for AttributesBuilder.

* Change Builder not to return *this

* change to const string& for key

* change time and duration to be const &

mixerclient/BUILD

@@ -38,9 +38,8 @@ genrule(
 cc_library(
     name = "mixer_client_lib",
     srcs = [
-        "src/attribute.cc",
-        "src/attribute_converter.cc",
-        "src/attribute_converter.h",
+        "src/attribute_compressor.cc",
+        "src/attribute_compressor.h",
         "src/check_cache.cc",
         "src/check_cache.h",
         "src/client_impl.cc",
@@ -62,7 +61,7 @@ cc_library(
         "utils/status_test_util.h",
     ],
     hdrs = [
-        "include/attribute.h",
+        "include/attributes_builder.h",
         "include/client.h",
         "include/options.h",
         "include/timer.h",
@@ -102,20 +101,9 @@ cc_test(
 )
 
 cc_test(
-    name = "attribute_test",
+    name = "attribute_compressor_test",
     size = "small",
-    srcs = ["src/attribute_test.cc"],
-    linkstatic = 1,
-    deps = [
-        ":mixer_client_lib",
-        "//external:googletest_main",
-    ],
-)
-
-cc_test(
-    name = "attribute_converter_test",
-    size = "small",
-    srcs = ["src/attribute_converter_test.cc"],
+    srcs = ["src/attribute_compressor_test.cc"],
     linkstatic = 1,
     deps = [
         ":mixer_client_lib",

mixerclient/include/attributes_builder.h

@@ -0,0 +1,95 @@
+/* Copyright 2017 Istio Authors. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef MIXERCLIENT_ATTRIBUTES_BUILDER_H
+#define MIXERCLIENT_ATTRIBUTES_BUILDER_H
+
+#include <chrono>
+#include <map>
+#include <string>
+
+#include "mixer/v1/attributes.pb.h"
+
+namespace istio {
+namespace mixer_client {
+
+// Builder class to add attribute to protobuf Attributes.
+// Its usage:
+//    builder(attribute).Add("key", value)
+//                      .Add("key2", value2);
+class AttributesBuilder {
+ public:
+  AttributesBuilder(::istio::mixer::v1::Attributes* attributes)
+      : attributes_(attributes) {}
+
+  void AddString(const std::string& key, const std::string& str) {
+    (*attributes_->mutable_attributes())[key].set_string_value(str);
+  }
+
+  void AddBytes(const std::string& key, const std::string& bytes) {
+    (*attributes_->mutable_attributes())[key].set_bytes_value(bytes);
+  }
+
+  void AddInt64(const std::string& key, int64_t value) {
+    (*attributes_->mutable_attributes())[key].set_int64_value(value);
+  }
+
+  void AddDouble(const std::string& key, double value) {
+    (*attributes_->mutable_attributes())[key].set_double_value(value);
+  }
+
+  void AddBool(const std::string& key, bool value) {
+    (*attributes_->mutable_attributes())[key].set_bool_value(value);
+  }
+
+  void AddTimestamp(
+      const std::string& key,
+      const std::chrono::time_point<std::chrono::system_clock>& value) {
+    auto time_stamp =
+        (*attributes_->mutable_attributes())[key].mutable_timestamp_value();
+    long long nanos = std::chrono::duration_cast<std::chrono::nanoseconds>(
+                          value.time_since_epoch())
+                          .count();
+    time_stamp->set_seconds(nanos / 1000000000);
+    time_stamp->set_nanos(nanos % 1000000000);
+  }
+
+  void AddDuration(const std::string& key,
+                   const std::chrono::nanoseconds& value) {
+    auto duration =
+        (*attributes_->mutable_attributes())[key].mutable_duration_value();
+    duration->set_seconds(value.count() / 1000000000);
+    duration->set_nanos(value.count() % 1000000000);
+  }
+
+  void AddStringMap(const std::string& key,
+                    const std::map<std::string, std::string>& string_map) {
+    auto entries = (*attributes_->mutable_attributes())[key]
+                       .mutable_string_map_value()
+                       ->mutable_entries();
+    entries->clear();
+    for (const auto& map_it : string_map) {
+      (*entries)[map_it.first] = map_it.second;
+    }
+  }
+
+ private:
+  ::istio::mixer::v1::Attributes* attributes_;
+};
+
+}  // namespace mixer_client
+}  // namespace istio
+
+#endif  // MIXERCLIENT_ATTRIBUTES_BUILDER_H

mixerclient/include/client.h

@@ -16,7 +16,6 @@
 #ifndef MIXERCLIENT_CLIENT_H
 #define MIXERCLIENT_CLIENT_H
 
-#include "attribute.h"
 #include "google/protobuf/stubs/status.h"
 #include "mixer/v1/service.pb.h"
 #include "options.h"
@@ -94,11 +93,11 @@ class MixerClient {
   // The response data from mixer will be consumed by mixer client.
 
   // A check call.
-  virtual CancelFunc Check(const Attributes& attributes,
+  virtual CancelFunc Check(const ::istio::mixer::v1::Attributes& attributes,
                            TransportCheckFunc transport, DoneFunc on_done) = 0;
 
   // A report call.
-  virtual void Report(const Attributes& attributes) = 0;
+  virtual void Report(const ::istio::mixer::v1::Attributes& attributes) = 0;
 };
 
 // Creates a MixerClient object.