What is the class do the function "Handshaker::DoHandShake()"

[xia rui]

Hello,everyone 

I am trying to trace the workflow of gRPC connection setup. 

I find that class `HandshakerManager` uses `HandshakeManager::CallNextHandshakerLocked` to start handshaking and run its callback.

In `HandshakeManager::CallNextHandshakerLocked`, there is a function call around line 178

```

auto handshaker = handshakers_[index_];

    if (GRPC_TRACE_FLAG_ENABLED(grpc_handshaker_trace)) {

      gpr_log(

          GPR_INFO,

          "handshake_manager %p: calling handshaker %s [%p] at index %" PRIuPTR,

          this, handshaker->name(), handshaker.get(), index_);

    }

    handshaker->DoHandshake(acceptor_, &call_next_handshaker_, &args_);

```

I think function `DoHandshake` actually do the handshaking. But I do not know where it is.

I guess it may be `HttpConnectHandshaker::DoHandshake`, and mark a `printf` there. However, the function in `HandshakeManager` does not call `HttpConnectHandshaker`.

So, where is the actual implementation of `DoHandshake`. 

Thank you for your time.

Best wishes,

Xia Rui

[Yang Gao]

That is like a C++ virtual call and there would be a method on each handshaker. For example, the one you found is one of them.

Not every handshaker is registered/run for every channel. You can run your client with GRPC_TRACE=handshaker GRPC_VERBOSITY=DEBUG and check the output log to see what handshakers are used.

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[xia rui]

Thank you, I have checked GRPC_TRACE=handshake, I have found that it uses `http-connect`. And the class `HttpConnectHandshaker` has the name, `http_connect`.

class HttpConnectHandshaker : public Handshaker {

 public:

  HttpConnectHandshaker();

  void Shutdown(grpc_error* why) override;

  void DoHandshake(grpc_tcp_server_acceptor* acceptor,

                   grpc_closure* on_handshake_done,

                   HandshakerArgs* args) override;

  const char* name() const override { return "http_connect"; }

I made a mistake that I forgot to upload the locally changed `HttpConnectHandshaker.cc` to the server and missed the mark in the code. 

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