# gRPC - Python Server 만들기

## 🔗  Link

* gRPC 공식 문서 (python): <https://grpc.io/docs/quickstart/python/>
* gRPCio Github: <https://github.com/grpc/grpc/tree/master/src/python/grpcio>
* gRPCio pypi: <https://pypi.org/project/grpcio/>

## Step

1\) pf 정보 가져오는 서비스를 python grpc 서버로 wrapping (이때 proto buf 정의)

## Pre

```bash
$ pyenv versions
$ pyenv 3.7.0
$ source env/bin/activate
$ pip install --upgrade pip
```

### Installation

```bash
$ python -m pip install grpcio
$ pip install grpcio-tools
```

### Clone Example App

```bash
$ git clone -b v1.22.0 https://github.com/grpc/grpc
$ cd grpc/examples/python/helloworld
```

### Run a gRPC App

```bash
$ python greeter_server.py

## 다른 탭에서
$ python greeter_client.py
```

### Demo code

```
// pfservice.proto

syntax = "proto3";

option java_multiple_files = true;
option java_package = "io.grpc.examples.helloworld";
option java_outer_classname = "HelloWorldProto";
option objc_class_prefix = "HLW";



// helloworld.poroto 복사해왔고
packagep lusfriend.service;


//
service PlusfriendService {
  // Sends a greeting
  rpc GetProfiles (ReqProfiles) returns (ResProfiles) {}
}


message Profile {
    uint32 id = 1;
    uint32 friend_count = 2;
}

// 프로필 조회하는 request 라서, id 리스트를 받을것이므로 Profile 메세지를 새로만들고 그것을 여러개 보내기로.
message ReqProfiles {
  repeated string ids = 1;
}

// The response message containing the greetings
message ResProfiles {
  repeated Profile profiles = 1;
}

```

### Generate gRPC code

```
$ python -m grpc_tools.protoc -I../../protos --python_out=. --grpc_python_out=. ../../protos/helloworld.proto
```

* grpc client 가 있어서 curl 처럼 테스트해볼 수 있음. (-> 에디 참고)
  * zshrc 에 #grpc\_tools ? 머 그런거 있음/
* reflection 무엇

\----

gRPC 의 http request 클라이언트 찾아보기

* aiohttp 등을 사용해야하지만,
* 일단은 블록킹 되더라도 일반 리퀘스트로 만들어보자.

```
$ pip install requests
```

/server.py

```
ids = ','.join(request.ids)

```


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