grpc-web使用

 1 syntax = "proto3";
 2 
 3 package api;
 4 
 5 // 这里可以写服务注释
 6 service HelloWorldService {
 7     // 这里可以写方法注释
 8     rpc SayHello (HelloRequest) returns (HelloResponse) {}
 9 }
10 
11 // 这里可以写请求结构注释
12 message HelloRequest {
13     // 这里可以写参数注释
14     string name = 1;
15 }
16 
17 // 这里可以写响应结构注释
18 message HelloResponse {
19     // 这里可以写参数注释
20     string message = 1;
21 }

cd /home/shimon/pkg

# 将下载后的内容移动到bin路径中方便使用
mv protoc-gen-grpc-web-1.4.1-linux-x86_64 /usr/local/bin/protoc-gen-grpc-web
# 增加可执行权限
chmod +x /usr/local/bin/protoc-gen-grpc-web

# 根据hello.proto生成js调用文件
protoc hello.proto  --js_out=import_style=commonjs:./output  --grpc-web_out=import_style=commonjs,mode=grpcweb:./output

import { HelloRequest } from './pb/hello_pb';
import { HelloWorldServiceClient } from './pb/hello_grpc_web_pb';

// 注意这个端口是代理服务器的端口，不是grpc的端口
const client = new HelloWorldServiceClient('http://localhost:8199',
    null, null);

const request = new HelloRequest();
request.setName('World');

client.sayHello(request, {}, (err, response) => {
    console.log(response.getMessage());
});

server {
  listen 8199;
  server_name _;

  access_log /tmp/grpc.log;
  error_log /tmp/grpc.log debug;

  location ~ \.(html|js)$ {
    root /var/www/html;
  }
  location / {
    # 重点！！需要将Content-Type更改为 application/grpc
    # grpc-web过来的是application/grpc-web+proto || application/grpc-web+text (取决于生成js代码时grpc-web_out 的mode选项，本文用grpcweb 则为application/grpc-web+proto)
    grpc_set_header Content-Type application/grpc;
    grpc_pass localhost:9999;
    # 因浏览器有跨域限制，这里直接在nginx支持跨域
    if ($request_method = 'OPTIONS') {
      add_header 'Access-Control-Allow-Origin' '*';
      add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
      add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Transfer-Encoding,Custom-Header-1,X-Accept-Content-Transfer-Encoding,X-Accept-Response-Streaming,X-User-Agent,X-Grpc-Web';
      add_header 'Access-Control-Max-Age' 1728000;
      add_header 'Content-Type' 'text/plain charset=UTF-8';
      add_header 'Content-Length' 0;
      return 204;
    }

    if ($request_method = 'POST') {
      add_header 'Access-Control-Allow-Origin' '*';
      add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
      add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Transfer-Encoding,Custom-Header-1,X-Accept-Content-Transfer-Encoding,X-Accept-Response-Streaming,X-User-Agent,X-Grpc-Web';
      add_header 'Access-Control-Expose-Headers' 'Content-Transfer-Encoding, grpc-message,grpc-status';
    }
  }
}