Re: [grpc-io] Re: Is it availble to do RPC requests from server to client with gRPC?

2018-11-01 Thread fsl5987 
Josh Humphries, thank you very much for detailed answer! 
I am not familiar with go, but i think that i can get some ideas and 
concepts from your code.


четверг, 1 ноября 2018 г., 20:04:51 UTC+5 пользователь Josh Humphries 
написал:
>
> On Thu, Nov 1, 2018 at 8:16 AM > wrote:
>
>>
>>
>> четверг, 1 ноября 2018 г., 16:02:25 UTC+5 пользователь Ivan Penchev 
>> написал:
>>>
>>> The only way to do this is, for the client first to contact the server.
>>>
>>> Then on the server you get an IServerStreamWriter, which gives you an 
>>> option to steam to the client .
>>>
>>> The reason you can do it the other way is, that the server must know all 
>>> the IP addresses to connect to :) 
>>>
>>>
>>> It is ok, if client should connect to server before any requests from 
>> server. 
>> But if i understand correctly,  IServerStreamWriter is one-direction 
>> streaming from server to client. 
>> But how to organize rpc requests (request-response model) from server to 
>> client, if we already have established connection from client
>>
>
> You can use a bi-directional stream, where each message that the server 
> sends on a stream will have a single message from the client in reply. The 
> actual request and response types can both have a oneof: the *response* 
> message 
> has an option in the oneof for each actual RPC operation (and its request 
> type); the *request* message (sent by the client) would actually define 
> the response types. You can see an example of something like this in the 
> server 
> reflection service 
> .
>  
> However, that is a normal client-to-server sort of RPC. You'd just swap the 
> request and response types (and have the server be the one that initiates 
> requests by sending a "response" message first, and getting a "request" in 
> reply).
>
> For graceful tear-down, the server will simply have to stop using the 
> stream for sending requests, wait for replies to all outstanding 
> operations, and then close the stream/terminate the RPC. When the client is 
> shutting down, it could stop accepting messages from the server (after 
> every one received, send an immediate error message along the lines of 
> "shutting down").
>
> If you want to support out of order execution (e.g. client replies can be 
> sent in different order than server requests were received), then the 
> request and response schemas will need to have an envelope with some sort 
> of request ID, to correlate replies with their original request.
>
>
> Aside: I've been working on something you may find useful -- a generic 
> mechanism for tunneling gRPC. The tunnel is setup via a gRPC service that 
> provides the same functionality as a low-level gRPC transport. There are a 
> few interesting use cases, but the server-to-client one is the most 
> interesting IMO. If you're curious, you can poke around at the 
> work-in-progress: https://github.com/jhump/grpctunnel. (Unfortunately, I 
> don't know when I'll get around to really finishing this library, but it 
> may have some interesting ideas/code you could use.)
>  
>
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[grpc-io] Re: Is it availble to do RPC requests from server to client with gRPC?

2018-11-01 Thread fsl5987 


четверг, 1 ноября 2018 г., 16:02:25 UTC+5 пользователь Ivan Penchev написал:
>
> The only way to do this is, for the client first to contact the server.
>
> Then on the server you get an IServerStreamWriter, which gives you an 
> option to steam to the client .
>
> The reason you can do it the other way is, that the server must know all 
> the IP addresses to connect to :) 
>
>
> It is ok, if client should connect to server before any requests from 
server. 
But if i understand correctly,  IServerStreamWriter is one-direction 
streaming from server to client. 
But how to organize rpc requests (request-response model) from server to 
client, if we already have established connection from client

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[grpc-io] Is it availble to do RPC requests from server to client with gRPC?

2018-11-01 Thread fsl5987 
 

Foreword: 

I didn't use gRPC before. I only doing first look on this technology and 
trying to understand can i use it in my project or no. 

I using C# with net core 2.1, if it matters for something.


Question: 

I have one server and miltiple clients and i need to do rpc requests from 
server to clients. 

Is it availbale with gRPC? And if yes, then how can i do that? 

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