Complete implementation for modify with index and delete with index

functionalities. AsyncModifyResponse is needed because handling of
indeces are different between create and mod and delete, as per
requirements.

remaining TODOs:
1) Watch functionality

etcd/Client.hpp

@@ -168,7 +168,7 @@ private:
     pplx::task<Response> removeEntryWithKey(std::string const &entryKey);
     pplx::task<Response> removeEntryWithKeyAndValue(std::string const &entryKey, std::string const &oldValue);
     pplx::task<Response> removeEntryWithKeyAndIndex(std::string const &entryKey, int oldIndex);
-
+    pplx::task<Response> modifyEntryWithValueAndOldIndex(std::string const & key, std::string const & value, int old_index);
   
     
   };

etcd/Response.hpp

@@ -45,7 +45,6 @@ namespace etcd
         {
           auto v3resp = call->ParseResponse();
           resp = etcd::Response(v3resp);
-          resp._index = call->reply.header().revision();
         }
         else
         {

src/CMakeLists.txt

@@ -1,4 +1,4 @@
-add_library(etcd-cpp-api SHARED ../proto/kv.pb.cc ../proto/auth.pb.cc ../proto/rpc.pb.cc ../proto/rpc.grpc.pb.cc ../v3/src/Utils.cpp ../v3/src/grpcClient.cpp ../v3/src/AsyncRangeResponse.cpp ../v3/src/AsyncPutResponse.cpp ../v3/src/V3BaseResponse.cpp ../v3/src/AsyncDelResponse.cpp Client.cpp Response.cpp Value.cpp json_constants.cpp BaseResponse.cpp AsyncDeleteResponse.cpp)
+add_library(etcd-cpp-api SHARED ../proto/kv.pb.cc ../proto/auth.pb.cc ../proto/rpc.pb.cc ../proto/rpc.grpc.pb.cc ../v3/src/Utils.cpp ../v3/src/grpcClient.cpp ../v3/src/AsyncRangeResponse.cpp ../v3/src/AsyncPutResponse.cpp ../v3/src/V3BaseResponse.cpp ../v3/src/AsyncDelResponse.cpp ../v3/src/AsyncModifyResponse.cpp Client.cpp Response.cpp Value.cpp json_constants.cpp BaseResponse.cpp AsyncDeleteResponse.cpp)
 set_property(TARGET etcd-cpp-api PROPERTY CXX_STANDARD 11)
 
 target_link_libraries(etcd-cpp-api ${CPPREST_LIB} boost_system ssl crypto protobuf grpc++)

src/Client.cpp

@@ -2,6 +2,7 @@
 #include "v3/include/AsyncRangeResponse.hpp"
 #include "v3/include/AsyncPutResponse.hpp"
 #include "v3/include/AsyncDelResponse.hpp"
+#include "v3/include/AsyncModifyResponse.hpp"
 #include "v3/include/Utils.hpp"
 
 #include <iostream>
@@ -54,11 +55,44 @@ pplx::task<etcd::Response> etcd::Client::modify_if(std::string const & key, std:
   return send_asyncmodify_if(key, value, old_value);
 }
 
+pplx::task<etcd::Response> etcd::Client::modifyEntryWithValueAndOldIndex(std::string const & key, std::string const & value, int old_index) {
+
+
+	  etcdv3::AsyncRangeResponse* resp = etcdv3::Utils::getKey(key, grpcClient);
+	  if(!resp->reply.kvs_size())
+	  {
+	    resp->error_code=100;
+	    resp->error_message="Key not found";
+	    return Response::createResponse(*resp);
+	  }
+	  else if(resp->reply.kvs(0).mod_revision() != old_index)
+	  {
+		  resp->error_code = 101;
+		  resp->error_message = "Compare failed";
+		  return Response::createResponse(*resp);
+	  }
+
+	  PutRequest put_request;
+	  put_request.set_key(key);
+	  put_request.set_value(value);
+
+	  etcdv3::AsyncModifyResponse* call= new etcdv3::AsyncModifyResponse("compareAndSwap");
+
+	  //below 2 lines can be removed once we are able to use Txn
+	  call->prev_value = resp->reply.kvs(0);
+	  call->client = &grpcClient;
+	  call->key = key;
+
+	  call->rpcInstance = grpcClient.stub_->AsyncPut(&call->context,put_request,&call->cq_);
+
+	  call->rpcInstance->Finish(&call->putResponse, &call->status, (void*)call);
+
+	  return Response::create(call);
+}
+
 pplx::task<etcd::Response> etcd::Client::modify_if(std::string const & key, std::string const & value, int old_index)
 {
-  web::http::uri_builder uri("/v2/keys" + key);
-  uri.append_query("prevIndex", old_index);
-  return send_put_request(uri, "value", value);
+	return modifyEntryWithValueAndOldIndex(key, value, old_index);
 }
 
 //note: this one seems to not need the parseResponse() method
@@ -133,7 +167,6 @@ pplx::task<etcd::Response> etcd::Client::rm_if(std::string const & key, std::str
 pplx::task<etcd::Response> etcd::Client::removeEntryWithKeyAndIndex(std::string const &entryKey, int oldIndex) {
 
 	etcdv3::AsyncRangeResponse *searchResult = etcdv3::Utils::getKey(entryKey, grpcClient);
-	std::cout << "found revision in item is: " << searchResult->reply.kvs(0).create_revision() << std::endl;
 
 	if(!searchResult->reply.kvs_size()) {
 		searchResult->error_code = 100;
@@ -262,16 +295,16 @@ pplx::task<etcd::Response> etcd::Client::send_asyncmodify_if(std::string const &
   put_request.set_key(key);
   put_request.set_value(value);
     
-  etcdv3::AsyncPutResponse* call= new etcdv3::AsyncPutResponse("compareAndSwap"); 
+  etcdv3::AsyncModifyResponse* call= new etcdv3::AsyncModifyResponse("compareAndSwap");
 
   //below 2 lines can be removed once we are able to use Txn
   call->prev_value = resp->reply.kvs(0);
   call->client = &grpcClient;
   call->key = key;
 
-  call->response_reader = grpcClient.stub_->AsyncPut(&call->context,put_request,&call->cq_);
+  call->rpcInstance = grpcClient.stub_->AsyncPut(&call->context,put_request,&call->cq_);
 
-  call->response_reader->Finish(&call->reply, &call->status, (void*)call);
+  call->rpcInstance->Finish(&call->putResponse, &call->status, (void*)call);
 
   return Response::create(call);
 
@@ -293,16 +326,16 @@ pplx::task<etcd::Response> etcd::Client::send_asyncmodify(std::string const & ke
   put_request.set_key(key);
   put_request.set_value(value);
     
-  etcdv3::AsyncPutResponse* call= new etcdv3::AsyncPutResponse("update"); 
+  etcdv3::AsyncModifyResponse* call= new etcdv3::AsyncModifyResponse("update");
 
   //below 2 lines can be removed once we are able to use Txn
   call->prev_value = resp->reply.kvs(0);
   call->client = &grpcClient;
   call->key = key;
 
-  call->response_reader = grpcClient.stub_->AsyncPut(&call->context,put_request,&call->cq_);
+  call->rpcInstance = grpcClient.stub_->AsyncPut(&call->context,put_request,&call->cq_);
 
-  call->response_reader->Finish(&call->reply, &call->status, (void*)call);
+  call->rpcInstance->Finish(&call->putResponse, &call->status, (void*)call);
 
   return Response::create(call);
 

tst/EtcdTest.cpp

@@ -135,8 +135,6 @@ TEST_CASE("atomic compare-and-delete based on prevIndex")
   CHECK("42" == res.prev_value().as_string());
 }
 
-#if 0
-
 TEST_CASE("deep atomic compare-and-swap")
 {
   etcd::Client etcd("http://127.0.0.1:4001");
@@ -145,7 +143,6 @@ TEST_CASE("deep atomic compare-and-swap")
   // modify success
   etcd::Response res = etcd.modify_if("/test/key1", "43", "42").get();
   int index = res.index();
-  std::cout << "index to use: " << index << std::endl;
   REQUIRE(res.is_ok());
   CHECK("compareAndSwap" == res.action());
   CHECK("43" == res.value().as_string());
@@ -169,6 +166,8 @@ TEST_CASE("deep atomic compare-and-swap")
   CHECK("Compare failed" == res.error_message());
 }
 
+#if 0
+
 TEST_CASE("create a directory")
 {
   etcd::Client etcd("http://127.0.0.1:4001");

v3/include/AsyncModifyResponse.hpp

@@ -0,0 +1,33 @@
+/*
+ * AsyncModifyResponse.h
+ *
+ *  Created on: Jun 9, 2016
+ *      Author: ubuntu
+ */
+
+#ifndef V3_SRC_ASYNCMODIFYRESPONSE_HPP_
+#define V3_SRC_ASYNCMODIFYRESPONSE_HPP_
+
+#include "v3/include/V3Response.hpp"
+#include "v3/include/V3BaseResponse.hpp"
+#include "v3/include/grpcClient.hpp"
+
+namespace etcdv3 {
+
+class AsyncModifyResponse : public etcdv3::V3Response, public etcdv3::V3BaseResponse {
+public:
+	AsyncModifyResponse(){action="compareAndSwap";};
+	AsyncModifyResponse(std::string const &);
+	AsyncModifyResponse(const AsyncModifyResponse&);
+	AsyncModifyResponse& operator=(const AsyncModifyResponse&);
+	virtual ~AsyncModifyResponse();
+
+	etcdserverpb::PutResponse putResponse;
+	std::unique_ptr<grpc::ClientAsyncResponseReader<etcdserverpb::PutResponse>> rpcInstance;
+	AsyncModifyResponse& ParseResponse();
+	etcdv3::grpcClient* client;
+	std::string key;
+};
+} /* namespace etcdv3 */
+
+#endif /* V3_SRC_ASYNCMODIFYRESPONSE_HPP_ */

v3/src/AsyncModifyResponse.cpp

@@ -0,0 +1,60 @@
+/*
+ * AsyncModifyResponse.cpp
+ *
+ *  Created on: Jun 9, 2016
+ *      Author: ubuntu
+ */
+
+#include "v3/include/AsyncModifyResponse.hpp"
+#include "v3/include/Utils.hpp"
+
+namespace etcdv3 {
+
+etcdv3::AsyncModifyResponse::AsyncModifyResponse(const etcdv3::AsyncModifyResponse& other) {
+	error_code = other.error_code;
+	error_message = other.error_message;
+	index = other.index;
+	action = other.action;
+	values = other.values;
+	prev_value.set_key(other.prev_value.key());
+	prev_value.set_value(other.prev_value.value());
+	prev_value.set_create_revision(other.prev_value.create_revision());
+	prev_value.set_mod_revision(other.prev_value.mod_revision());
+}
+
+etcdv3::AsyncModifyResponse::AsyncModifyResponse(const std::string &input) {
+	action = input;
+}
+
+etcdv3::AsyncModifyResponse& etcdv3::AsyncModifyResponse::operator=(const etcdv3::AsyncModifyResponse& other) {
+	  error_code = other.error_code;
+	  error_message = other.error_message;
+	  index = other.index;
+	  action = other.action;
+	  values = other.values;
+	  prev_value.set_key(other.prev_value.key());
+	  prev_value.set_value(other.prev_value.value());
+	  prev_value.set_create_revision(other.prev_value.create_revision());
+	  prev_value.set_mod_revision(other.prev_value.mod_revision());
+	  return *this;
+}
+
+AsyncModifyResponse::~AsyncModifyResponse() {
+	// TODO Auto-generated destructor stub
+}
+
+etcdv3::AsyncModifyResponse& etcdv3::AsyncModifyResponse::ParseResponse() {
+	etcdv3::AsyncRangeResponse* response = etcdv3::Utils::getKey(key, *client);
+	if(response->reply.kvs_size())
+	{
+		values.push_back(response->reply.kvs(0));
+		index = response->reply.kvs(0).mod_revision();
+	}
+	else{
+		index = response->reply.header().revision();
+	}
+
+	return *this;
+}
+
+} /* namespace etcdv3 */

v3/src/AsyncPutResponse.cpp

@@ -1,6 +1,8 @@
 #include "v3/include/AsyncPutResponse.hpp"
 #include "v3/include/Utils.hpp"
 
+#include <iostream>
+
 using etcdserverpb::PutRequest;
 using etcdserverpb::PutRequest;
 
@@ -38,7 +40,10 @@ etcdv3::AsyncPutResponse& etcdv3::AsyncPutResponse::ParseResponse()
   if(resp->reply.kvs_size())
   {
     values.push_back(resp->reply.kvs(0));
+    index = resp->reply.kvs(0).create_revision();
   }
+  else
+	  index = resp->reply.header().revision();
 
   return *this;
 }

v3/src/AsyncRangeResponse.cpp

@@ -42,7 +42,7 @@ etcdv3::AsyncRangeResponse& etcdv3::AsyncRangeResponse::ParseResponse()
     error_code=100;
     error_message="Key not found";
   }
-
+  index = reply.header().revision();
   return *this;
 }