Avoid including protobuf & grpc headers in our interface files.

Signed-off-by: Tao He <sighingnow@gmail.com>

CMakeLists.txt

@@ -88,12 +88,9 @@ endif()
 
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/bin)
 
-add_subdirectory(src)
-
-if (BUILD_ETCD_TESTS)
 enable_testing()
+add_subdirectory(src)
 add_subdirectory(tst)
-endif ()
 
 install (FILES ${CMAKE_CURRENT_SOURCE_DIR}/etcd/Client.hpp
                ${CMAKE_CURRENT_SOURCE_DIR}/etcd/KeepAlive.hpp

etcd/Client.hpp

@@ -5,7 +5,6 @@
 #include <mutex>
 #include <string>
 
-#include <grpc++/grpc++.h>
 #include "pplx/pplxtasks.h"
 
 #include "etcd/Response.hpp"
@@ -18,6 +17,10 @@ namespace etcdv3 {
   }
 }
 
+namespace grpc {
+  class Channel;
+}
+
 namespace etcd
 {
   class KeepAlive;

etcd/Response.hpp

@@ -8,7 +8,6 @@
 #include "pplx/pplxtasks.h"
 
 #include "etcd/Value.hpp"
-#include "kv.pb.h"
 
 namespace etcdv3 {
   class AsyncWatchAction;
@@ -138,7 +137,7 @@ namespace etcd
     /**
      * Returns the watched events.
      */
-    std::vector<mvccpb::Event> const & events() const;
+    std::vector<Event> const & events() const;
 
     /**
      * Returns the duration of request execution in microseconds.
@@ -158,7 +157,7 @@ namespace etcd
     Values      _values;
     Keys        _keys;
     std::string _lock_key; // for lock
-    std::vector<mvccpb::Event> _events; // for watch
+    std::vector<Event> _events; // for watch
     std::chrono::microseconds _duration; // execute duration (in microseconds), during the action created and response parsed
     friend class SyncClient;
     friend class etcdv3::AsyncWatchAction;

etcd/Value.hpp

@@ -8,8 +8,17 @@ namespace etcdv3 {
   class KeyValue;
 }
 
+namespace mvccpb {
+  class KeyValue;
+  class Event;
+}
+
 namespace etcd
 {
+  class Value;
+  class Event;
+  class Response;
+
   /**
    * Represents a value object received from the etcd server
    */
@@ -54,8 +63,12 @@ namespace etcd
     friend class BaseResponse; //deliberately done since Value class will be removed during full V3
     friend class DeleteRpcResponse;
     friend class AsyncDeleteResponse;
+
+    friend class Event;
+
     Value();
     Value(etcdv3::KeyValue const & kvs);
+    Value(mvccpb::KeyValue const & kvs);
     std::string _key;
     bool        dir;
     std::string value;
@@ -66,6 +79,38 @@ namespace etcd
   };
 
   typedef std::vector<Value> Values;
+
+  class Event
+  {
+  public:
+    enum class EventType {
+      PUT,
+      DELETE_,
+      INVALID,
+    };
+
+    enum EventType event_type() const;
+
+    bool has_kv() const;
+
+    bool has_prev_kv() const;
+
+    const Value &kv() const;
+
+    const Value &prev_kv() const;
+
+  protected:
+    friend class Response;
+
+    Event(mvccpb::Event const & event);
+
+  private:
+    enum EventType event_type_;
+    Value _kv, _prev_kv;
+    bool _has_kv, _has_prev_kv;
+  };
+
+  typedef std::vector<Event> Events;
 }
 
 #endif

src/Response.cpp

@@ -3,7 +3,6 @@
 
 #include <iostream>
 
-
 etcd::Response::Response(const etcdv3::V3Response& reply, std::chrono::microseconds const& duration)
 {
   _index = reply.get_index();
@@ -27,7 +26,9 @@ etcd::Response::Response(const etcdv3::V3Response& reply, std::chrono::microseco
   _prev_value = Value(reply.get_prev_value());
 
   _lock_key = reply.get_lock_key();
-  _events = reply.get_events();
+  for (auto const &ev: reply.get_events()) {
+    _events.emplace_back(etcd::Event(ev));
+  }
 
   // duration
   _duration = duration;
@@ -111,7 +112,7 @@ std::string const & etcd::Response::lock_key() const {
   return _lock_key;
 }
 
-std::vector<mvccpb::Event> const & etcd::Response::events() const {
+std::vector<etcd::Event> const & etcd::Response::events() const {
   return this->_events;
 }
 

src/Value.cpp

@@ -24,6 +24,17 @@ etcd::Value::Value(etcdv3::KeyValue const & kv)
   _ttl = kv.get_ttl();
 }
 
+etcd::Value::Value(mvccpb::KeyValue const & kv)
+{
+  dir = false;
+  _key = kv.key();
+  value = kv.value();
+  created = kv.create_revision();
+  modified = kv.mod_revision();
+  leaseId = kv.lease();
+  _ttl = -1;
+}
+
 std::string const & etcd::Value::key() const
 {
   return _key;
@@ -58,3 +69,41 @@ int64_t etcd::Value::lease() const
 {
   return leaseId;
 }
+
+etcd::Event::Event(mvccpb::Event const & event) {
+  _has_kv = event.has_kv();
+  _has_prev_kv = event.has_prev_kv();
+  if (_has_kv) {
+    _kv = Value(event.kv());
+  }
+  if (_has_prev_kv) {
+    _prev_kv = Value(event.prev_kv());
+  }
+  if (event.type() == mvccpb::Event::PUT) {
+    event_type_ = EventType::PUT;
+  } else if (event.type() == mvccpb::Event::DELETE_) {
+    event_type_ = EventType::DELETE_;
+  } else {
+    event_type_ = EventType::INVALID;
+  }
+}
+
+enum etcd::Event::EventType etcd::Event::event_type() const {
+  return event_type_;
+}
+
+bool etcd::Event::has_kv() const {
+  return _has_kv;
+}
+
+bool etcd::Event::has_prev_kv() const {
+  return _has_prev_kv;
+}
+
+const etcd::Value &etcd::Event::kv() const {
+  return _kv;
+}
+
+const etcd::Value &etcd::Event::prev_kv() const {
+  return _prev_kv;
+}

tst/CMakeLists.txt

@@ -10,7 +10,11 @@ foreach(testfile ${TEST_FILES})
     string(REGEX MATCH "^(.*)\\.[^.]*$" dummy ${testfile})
     set(test_name ${CMAKE_MATCH_1})
     message(STATUS "Found unit_test - " ${test_name})
+    if(BUILD_ETCD_TESTS)
         add_executable(${test_name} ${CMAKE_CURRENT_SOURCE_DIR}/${testfile})
+    else()
+        add_executable(${test_name} EXCLUDE_FROM_ALL ${CMAKE_CURRENT_SOURCE_DIR}/${testfile})
+    endif()
     add_test(NAME ${test_name} COMMAND $<TARGET_FILE:${test_name}>)
 
     set_property(TARGET ${test_name} PROPERTY CXX_STANDARD 11)

tst/WatcherTest.cpp

@@ -21,6 +21,14 @@ void printResponse(etcd::Response const & resp)
   {
     std::cout << resp.action() << " " << resp.value().as_string() << std::endl;
     std::cout << "Previous value: " << resp.prev_value().as_string() << std::endl;
+
+    std::cout << "Events size: " << resp.events().size() << std::endl;
+    for (auto const &ev: resp.events()) {
+      std::cout << "Value change in events: " << static_cast<int>(ev.event_type())
+                << ", prev kv = " << ev.prev_kv().key() << " -> " << ev.prev_kv().as_string()
+                << ", kv = " << ev.kv().key() << " -> " << ev.kv().as_string()
+                << std::endl;
+    }
   }
 }