Updates for Watcher

etcd/Response.hpp

@@ -1,7 +1,6 @@
 #ifndef __ETCD_RESPONSE_HPP__
 #define __ETCD_RESPONSE_HPP__
 
-#include <cpprest/http_client.h>
 #include <string>
 #include <vector>
 
@@ -9,9 +8,11 @@
 #include <grpc++/grpc++.h>
 
 #include "v3/include/V3Response.hpp"
-#include <grpc++/grpc++.h>
 
 #include <iostream>
+namespace etcdv3 {
+  class AsyncWatchAction;
+}
 
 namespace etcd
 {
@@ -110,6 +111,7 @@ namespace etcd
     Values      _values;
     Keys        _keys;
     friend class SyncClient;
+    friend class etcdv3::AsyncWatchAction;
   };
 }
 

etcd/Watcher.hpp

@@ -0,0 +1,34 @@
+#ifndef __ETCD_WATCHER_HPP__
+#define __ETCD_WATCHER_HPP__
+
+#include <string>
+#include "etcd/Response.hpp"
+#include "v3/include/AsyncWatchAction.hpp"
+
+#include <grpc++/grpc++.h>
+
+using etcdserverpb::Watch;
+using grpc::Channel;
+
+namespace etcd
+{
+  class Watcher
+  {
+  public:
+    Watcher(std::string const & etcd_url, std::string const & key, std::function<void(Response)> callback);
+    void Cancel();
+    void AddKey(std::string const & key);
+    ~Watcher();
+
+  protected:
+    void doWatch(std::string const & key, std::function<void(Response)> callback);
+
+    int index;
+    std::function<void(Response)> callback;
+    pplx::task<void> currentTask;
+    std::unique_ptr<Watch::Stub> watchServiceStub;
+    std::unique_ptr<etcdv3::AsyncWatchAction> call;
+  };
+}
+
+#endif

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/AsyncTxnResponse.cpp ../v3/src/AsyncRangeResponse.cpp ../v3/src/AsyncWatchResponse.cpp ../v3/src/Transaction.cpp ../v3/src/action_constants.cpp ../v3/src/AsyncSetAction.cpp ../v3/src/AsyncCompareAndSwapAction.cpp ../v3/src/AsyncUpdateAction.cpp ../v3/src/AsyncGetAction.cpp ../v3/src/AsyncDeleteAction.cpp ../v3/src/AsyncCompareAndDeleteAction.cpp ../v3/src/Action.cpp ../v3/src/AsyncWatchAction.cpp Client.cpp Response.cpp Value.cpp SyncClient.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/AsyncTxnResponse.cpp ../v3/src/AsyncRangeResponse.cpp ../v3/src/Transaction.cpp ../v3/src/action_constants.cpp ../v3/src/AsyncSetAction.cpp ../v3/src/AsyncCompareAndSwapAction.cpp ../v3/src/AsyncUpdateAction.cpp ../v3/src/AsyncGetAction.cpp ../v3/src/AsyncDeleteAction.cpp ../v3/src/AsyncCompareAndDeleteAction.cpp ../v3/src/Action.cpp ../v3/src/AsyncWatchAction.cpp Client.cpp Response.cpp Value.cpp SyncClient.cpp Watcher.cpp ../v3/src/AsyncWatchResponse.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

@@ -100,7 +100,7 @@ pplx::task<etcd::Response> etcd::Client::rm_if(std::string const & key, int old_
 
 pplx::task<etcd::Response> etcd::Client::rmdir(std::string const & key, bool recursive)
 {
-  std::shared_ptr<etcdv3::AsyncDeleteAction> call(new etcdv3::AsyncDeleteAction(key,stub_.get(),true));;
+  std::shared_ptr<etcdv3::AsyncDeleteAction> call(new etcdv3::AsyncDeleteAction(key,stub_.get(),true));
   return Response::create(call);
 }
 

src/Watcher.cpp

@@ -0,0 +1,68 @@
+#include "etcd/Watcher.hpp"
+
+etcd::Watcher::Watcher(std::string const & address, std::string const & key, std::function<void(Response)> callback)
+{
+  std::string stripped_address(address);
+  std::string substr("http://");
+  std::string::size_type i = stripped_address.find(substr);
+  if(i != std::string::npos)
+  {
+    stripped_address.erase(i,substr.length());
+  }
+  std::shared_ptr<Channel> channel = grpc::CreateChannel(stripped_address, grpc::InsecureChannelCredentials());
+  watchServiceStub= Watch::NewStub(channel);
+
+  doWatch(key, callback);
+}
+
+etcd::Watcher::~Watcher()
+{
+  call->CancelWatch();
+  currentTask.wait();
+}
+
+void etcd::Watcher::Cancel()
+{
+  call->CancelWatch();
+  currentTask.wait();
+}
+
+void etcd::Watcher::AddKey(std::string const & key)
+{
+  call->WatchReq(key);
+}
+
+void etcd::Watcher::doWatch(std::string const & key, std::function<void(Response)> callback)
+{
+
+  call.reset(new etcdv3::AsyncWatchAction(key,true,NULL,watchServiceStub.get()));
+
+  currentTask = pplx::task<void>([this, callback]()
+  {  
+    return call->waitForResponse(callback);
+  });
+
+
+  //return Response::create(call);
+
+  /*currentTask = client.request(web::http::methods::GET, uri.to_string(), cancellation_source.get_token())
+    .then([this](pplx::task<web::http::http_response> response_task)
+          {
+            try
+            {
+              auto http_response = response_task.get();
+              auto json_task = http_response.extract_json();
+              auto json_value = json_task.get();
+              callback(etcd::Response(http_response, json_value));
+            }
+            catch (std::exception const & ex)
+            {
+              if (pplx::is_task_cancellation_requested() || (ex.what() == std::string("Operation canceled")))
+                return;
+
+              if(ex.what() != std::string("Retrieving message chunk header"))
+                throw;
+            }
+            doWatch();
+          });*/
+}

tst/CMakeLists.txt

@@ -1,4 +1,4 @@
-add_executable(etcd_test EtcdTest.cpp EtcdSyncTest.cpp)
+add_executable(etcd_test EtcdTest.cpp EtcdSyncTest.cpp WatcherTest.cpp)
 set_property(TARGET etcd_test PROPERTY CXX_STANDARD 11)
 
 target_link_libraries(etcd_test etcd-cpp-api)

tst/WatcherTest.cpp

@@ -0,0 +1,127 @@
+#include <catch.hpp>
+
+#include "etcd/Watcher.hpp"
+#include "etcd/SyncClient.hpp"
+
+static std::string etcd_uri("http://127.0.0.1:2379");
+static int watcher_called = 0;
+
+void printResponse(etcd::Response const & resp)
+{
+  ++watcher_called;
+  std::cout << "print response called" << std::endl;
+  if (resp.error_code())
+    std::cout << resp.error_code() << ": " << resp.error_message() << std::endl;
+  else
+  {
+    std::cout << resp.action() << " " << resp.value().as_string() << std::endl;
+  }
+}
+
+TEST_CASE("create watcher")
+{
+  
+  etcd::SyncClient etcd(etcd_uri);
+  etcd.rmdir("/test", true);
+
+  watcher_called = 0;
+  //{
+    std::cout << "watch started" << std::endl;
+    etcd::Watcher watcher(etcd_uri, "/test", printResponse);
+    sleep(1);
+    etcd.set("/test/key", "42");
+    std::cout << "first set finished" << std::endl;
+    etcd.set("/test/key", "43");
+    std::cout << "second set finished" << std::endl;
+  //}
+  
+  sleep(1);
+  CHECK(2 == watcher_called);
+// TEST_CASE("wait for a value change")
+// {
+//   etcd::Client etcd(etcd_uri);
+//   etcd.set("/test/key1", "42").wait();
+
+//   pplx::task<etcd::Response> res = etcd.watch("/test/key1");
+//   CHECK(!res.is_done());
+
+//   etcd.set("/test/key1", "43").get();
+//   sleep(1);
+
+//   REQUIRE(res.is_done());
+//   REQUIRE("set" == res.get().action());
+//   CHECK("43" == res.get().value().as_string());
+// }
+
+// TEST_CASE("wait for a directory change")
+// {
+//   etcd::Client etcd(etcd_uri);
+
+//   pplx::task<etcd::Response> res = etcd.watch("/test", true);
+
+//   etcd.add("/test/key4", "44").wait();
+//   REQUIRE(res.is_done());
+//   CHECK("create" == res.get().action());
+//   CHECK("44" == res.get().value().as_string());
+
+//   pplx::task<etcd::Response> res2 = etcd.watch("/test", true);
+
+//   etcd.set("/test/key4", "45").wait();
+//   sleep(1);
+//   REQUIRE(res2.is_done());
+//   CHECK("set" == res2.get().action());
+//   CHECK("45" == res2.get().value().as_string());
+// }
+
+// TEST_CASE("watch changes in the past")
+// {
+//   etcd::Client etcd(etcd_uri);
+
+//   int index = etcd.set("/test/key1", "42").get().index();
+
+//   etcd.set("/test/key1", "43").wait();
+//   etcd.set("/test/key1", "44").wait();
+//   etcd.set("/test/key1", "45").wait();
+
+//   etcd::Response res = etcd.watch("/test/key1", ++index).get();
+//   CHECK("set" == res.action());
+//   CHECK("43" == res.value().as_string());
+
+//   res = etcd.watch("/test/key1", ++index).get();
+//   CHECK("set" == res.action());
+//   CHECK("44" == res.value().as_string());
+
+//   res = etcd.watch("/test", ++index, true).get();
+//   CHECK("set" == res.action());
+//   CHECK("45" == res.value().as_string());
+// }
+
+// TEST_CASE("request cancellation")
+// {
+//   etcd::Client etcd(etcd_uri);
+//   etcd.set("/test/key1", "42").wait();
+
+//   pplx::task<etcd::Response> res = etcd.watch("/test/key1");
+//   CHECK(!res.is_done());
+
+//   etcd.cancel_operations();
+
+//   sleep(1);
+//   REQUIRE(res.is_done());
+//   try
+//   {
+//     res.wait();
+//   }
+//   catch(pplx::task_canceled const & ex)
+//   {
+//     std::cout << "pplx::task_canceled: " << ex.what() << "\n";
+//   }
+//   catch(std::exception const & ex)
+//   {
+//     std::cout << "std::exception: " << ex.what() << "\n";
+//   }
+// }
+  std::cout << "start rmdir" << std::endl;
+  etcd.rmdir("/test", true).error_code();
+  std::cout << "end rmdir" << std::endl;
+}

v3/include/AsyncWatchAction.hpp

@@ -5,6 +5,7 @@
 #include "proto/rpc.grpc.pb.h"
 #include "v3/include/Action.hpp"
 #include "v3/include/AsyncWatchResponse.hpp"
+#include "etcd/Response.hpp"
 
 
 using grpc::ClientAsyncReaderWriter;
@@ -22,9 +23,14 @@ namespace etcdv3
       AsyncWatchAction(std::string const & key, int fromIndex, bool recursive, KV::Stub* stub_, Watch::Stub* watchServiceStub);
       AsyncWatchResponse ParseResponse();
       void waitForResponse();
+      void waitForResponse(std::function<void(etcd::Response)> callback); 
+      void CancelWatch();
+      void WatchReq(std::string const & key);
       WatchResponse reply;
       KV::Stub* stub_;
       std::unique_ptr<ClientAsyncReaderWriter<WatchRequest,WatchResponse>> stream;
+      bool prefix;
+    
   };
 }
 

v3/src/AsyncTxnResponse.cpp

@@ -52,6 +52,10 @@ void etcdv3::AsyncTxnResponse::ParseResponse()
         range_kvs = response.values;
       }
     }
+    else if(ResponseOp::ResponseCase::kResponseDeleteRange == resp.response_case())
+    {
+      std::cout << "number of deleted keys: " << resp.response_delete_range().deleted() <<std::endl;
+    }
   }
   prev_values = prev_range_kvs;
   values = range_kvs; 

v3/src/AsyncWatchAction.cpp

@@ -1,19 +1,22 @@
 #include "v3/include/AsyncWatchAction.hpp"
 #include "v3/include/action_constants.hpp"
 
+
 using etcdserverpb::RangeRequest;
 using etcdserverpb::RangeResponse;
 using etcdserverpb::WatchCreateRequest;
 
 etcdv3::AsyncWatchAction::AsyncWatchAction(std::string const & key, bool recursive, KV::Stub* stub_, Watch::Stub* watchServiceStub) 
 {
-  stream = watchServiceStub->AsyncWatch(&context,&cq_,(void*)this);
+  std::cout << "AsyncWatchAction create start" << std::endl;
+  stream = watchServiceStub->AsyncWatch(&context,&cq_,(void*)"create");
 
   WatchRequest watch_req;
   WatchCreateRequest watch_create_req;
   watch_create_req.set_key(key);
 
   std::string range_end(key); 
+  prefix = recursive;
   if(recursive)
   {
     int ascii = (int)range_end[range_end.length()-1];
@@ -22,14 +25,16 @@ etcdv3::AsyncWatchAction::AsyncWatchAction(std::string const & key, bool recursi
   }
 
   watch_req.mutable_create_request()->CopyFrom(watch_create_req);
-  stream->Write(watch_req, (void*)this);
+  stream->Write(watch_req, (void*)"write");
+  stream->Read(&reply, (void*)this);
   stub_ = stub_;
+  std::cout << "AsyncWatchAction create end" << std::endl;
 
 }
 
 etcdv3::AsyncWatchAction::AsyncWatchAction(std::string const & key, int fromIndex, bool recursive, KV::Stub* stub_, Watch::Stub* watchServiceStub) 
 {
-  stream = watchServiceStub->AsyncWatch(&context,&cq_,(void*)this);
+  stream = watchServiceStub->AsyncWatch(&context,&cq_,(void*)1);
 
   WatchRequest watch_req;
   WatchCreateRequest watch_create_req;
@@ -44,36 +49,86 @@ etcdv3::AsyncWatchAction::AsyncWatchAction(std::string const & key, int fromInde
     watch_create_req.set_range_end(range_end);
   }
 
-
   watch_req.mutable_create_request()->CopyFrom(watch_create_req);
-  stream->Write(watch_req, (void*)this);
+  stream->Write(watch_req, (void*)1);
+  stream->Read(&reply, (void*)this);
   stub_ = stub_;
 }
 
+void etcdv3::AsyncWatchAction::WatchReq(std::string const & key) 
+{
+  WatchRequest watch_req;
+  WatchCreateRequest watch_create_req;
+  watch_create_req.set_key(key);
+
+  watch_req.mutable_create_request()->CopyFrom(watch_create_req);
+  stream->Write(watch_req, (void*)1);
+  stream->Read(&reply, (void*)this);
+}
+
+
 void etcdv3::AsyncWatchAction::waitForResponse() 
 {
   void* got_tag;
   bool ok = false;    
 
-  stream->Read(&reply, (void*)3);
   while(cq_.Next(&got_tag, &ok))
   {
-    if(got_tag == (void*)3)
+    if(got_tag == (void*)this) // read tag
     {
       if(reply.events_size())
       {
         stream->WritesDone((void*)this);
         cq_.Next(&got_tag, &ok);
         break;
-      } 
+      }
       else
       {
-        stream->Read(&reply, (void*)3);
-      }
+        stream->Read(&reply, (void*)this);
+      } 
     }   
   }
 }
 
+void etcdv3::AsyncWatchAction::CancelWatch()
+{
+  std::cout << "cancel watch"<< std::endl;
+  stream->WritesDone((void*)"writes done");
+}
+
+void etcdv3::AsyncWatchAction::waitForResponse(std::function<void(etcd::Response)> callback) 
+{
+  std::cout << "waitForResponse start" << std::endl;
+  void* got_tag;
+  bool ok = false;    
+
+  while(cq_.Next(&got_tag, &ok))
+  {
+    if(ok == false)
+    {
+      break;
+    }
+    std::cout << "ok status: " << ok << std::endl;
+    if(got_tag == (void*)"writes done")
+    {
+      std::cout << "writes done" << std::endl;
+    }
+    else if(got_tag == (void*)this) // read tag
+    {
+      std::cout << "read tag" << std::endl;
+      std::cout << "events size: "<< reply.events_size() << std::endl;
+      if(reply.events_size())
+      {
+        auto resp = ParseResponse();
+        callback(resp); 
+        std::cout << "events received try to read again" << std::endl;
+      }
+      std::cout << " read again" << std::endl;
+      stream->Read(&reply, (void*)this);
+    }     
+  }
+}
+
 etcdv3::AsyncWatchResponse etcdv3::AsyncWatchAction::ParseResponse()
 {