73 lines
1.9 KiB
C++
73 lines
1.9 KiB
C++
#ifndef __ETCD_WATCHER_HPP__
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#define __ETCD_WATCHER_HPP__
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#include <string>
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#include "etcd/Client.hpp"
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#include "etcd/Response.hpp"
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#include <grpc++/grpc++.h>
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#include "proto/rpc.grpc.pb.h"
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namespace etcdv3 {
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class AsyncWatchAction;
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}
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using etcdserverpb::KV;
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using etcdserverpb::Watch;
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using grpc::Channel;
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namespace etcd
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{
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class Watcher
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{
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public:
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Watcher(Client &client, std::string const & key,
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std::function<void(Response)> callback, bool recursive=false);
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Watcher(Client &client, std::string const & key, int fromIndex,
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std::function<void(Response)> callback, bool recursive=false);
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Watcher(std::string const & etcd_url, std::string const & key,
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std::function<void(Response)> callback, bool recursive=false);
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Watcher(std::string const & etcd_url, std::string const & key, int fromIndex,
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std::function<void(Response)> callback, bool recursive=false);
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/**
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* Wait util the task has been stopped, actively or passively, e.g., the watcher
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* get cancelled or the server closes the connection.
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*
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* Returns true if the watcher is been normally cancalled, otherwise false.
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*/
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bool Wait();
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/**
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* An async wait, the callback will be called when the task has been stopped.
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*
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* The callback parameter would be true if the watch is been normally cancalled.
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*/
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void Wait(std::function<void(bool)> callback);
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/**
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* Stop the watching action.
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*/
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void Cancel();
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~Watcher();
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protected:
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void doWatch(std::string const & key, std::function<void(Response)> callback);
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int index;
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std::function<void(Response)> callback;
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pplx::task<void> currentTask;
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std::unique_ptr<Watch::Stub> watchServiceStub;
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std::unique_ptr<KV::Stub> stub_;
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std::unique_ptr<etcdv3::AsyncWatchAction> call;
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private:
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int fromIndex;
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bool recursive;
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};
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}
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#endif
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