为什么要用Grpc
跨语言进行，调用服务，获取跨服务器调用等
目前我的需要使用 我的抓取端是go 写的 查询端用 Net6 写的 导致很多时候 我需要把一些临时数据写入到 Redis 在两个服务器进行处理
参考地址：
哔哩哔哩杨旭大佬：https://www.bilibili.com/video/BV1eE411T7GC/?spm_id_from=333.999.0.0
强烈建议去看一遍杨旭大佬讲的这篇Grpc 没有那么繁琐 清晰明了
1、依赖安装：
Grpc.AspNetCore Server 端包
2、编写proto 文件
点击查看代码
syntax = "proto3";
option csharp_namespace= "GrpcServer.Web.Protos";
message Employee{
int32 id = 1;
int32 no = 2;
string firstName = 3;
string lastName =4;
float salary = 5;
}
message GetByNoRequest{
int32 no =1;
}
message EmployeeResponse{
Employee employee =1;
}
message GetAllRequest{
}
message AddPhotoRequest{
bytes data = 1;
}
message AddPhotoResponse{
bool isOK = 1;
}
message EmployeeRequest{
Employee employee = 1;
}
service EmployeeService {
rpc GetByNo(GetByNoRequest) returns (EmployeeResponse);
rpc GetAll(GetAllRequest) returns (stream EmployeeResponse);
rpc AddPhoto(stream AddPhotoRequest) returns (AddPhotoResponse);
rpc Save (EmployeeRequest) returns(EmployeeResponse);
rpc SaveAll(stream EmployeeRequest) returns(stream EmployeeResponse);
}
3、编写Server端代码
在编写服务端代码之前，我们需要对proto 文件进行生成代码
如上图：1）我们要先进行勾选Build Action 选择，如图所示，
因为我们这里需要的只是 Server 端，选择生成Server Only
2) 选择这两个之后 我们需要重新生成一下项目
EmployeeService.EmployeeServiceBase 是我们Proto 生成的代码，我们要去重写父类的这些方法
点击查看代码
public class MyEmployeeService : EmployeeService.EmployeeServiceBase
{
private readonly ILogger<MyEmployeeService> _logger;
public MyEmployeeService(ILogger<MyEmployeeService> logger)
{
_logger = logger;
}
public override async Task<EmployeeResponse>
GetByNo(GetByNoRequest request, ServerCallContext context)
{
var employee = InMemoryData.Employees.SingleOrDefault(x => x.No == request.No);
if (employee != null)
{
var response = new EmployeeResponse
{
Employee = employee
};
return await Task.FromResult(response);
}
throw new Exception($"employee is not found :{request.No}");
}
public override async Task GetAll(GetAllRequest request, IServerStreamWriter<EmployeeResponse> responseStream, ServerCallContext context)
{
foreach (var item in InMemoryData.Employees)
{
await responseStream.WriteAsync(new EmployeeResponse
{
Employee = item
});
}
//return base.GetAll(request, responseStream, context);
}
public override async Task<AddPhotoResponse> AddPhoto(
IAsyncStreamReader<AddPhotoRequest> requestStream
, ServerCallContext context)
{
Metadata md = context.RequestHeaders;
foreach (var item in md)
{
Console.WriteLine($"{item.Key}:{item.Value}");
}
var data = new List<byte>();
while (await requestStream.MoveNext())
{
Console.WriteLine($"Received: {requestStream.Current.Data.Length}");
data.AddRange(requestStream.Current.Data);
}
Console.WriteLine($"data file with {data.Count} bytes");
return new AddPhotoResponse
{
IsOK = true
};
}
public override async Task SaveAll(
IAsyncStreamReader<EmployeeRequest> requestStream
, IServerStreamWriter<EmployeeResponse> responseStream
, ServerCallContext context)
{
while (await requestStream.MoveNext())
{
var employee = requestStream.Current.Employee;
lock (this)
{
InMemoryData.Employees.Add(employee);
}
await responseStream.WriteAsync(new EmployeeResponse
{
Employee = employee
});
}
Console.WriteLine("Employees");
foreach (var item in InMemoryData.Employees)
{
Console.WriteLine(item);
}
//return base.SaveAll(requestStream, responseStream, context);
}
}
4、编写Client客户端代码
- 我们把服务端的Proto 文件复制一份到Client 端代码 生成一份Client 代码如下图
需要注意
在编写客户端代码的时候，我遇到了一个错误，提示证书验证失败！，（没有配置证书）
所以我们要加上不对证书进行验证
使用 GrpcChannelOptions() 对证书验证
using var channel = GrpcChannel.ForAddress("https://localhost:5001", new GrpcChannelOptions()
{
HttpClient = null,
HttpHandler = new HttpClientHandler
{
//方法一
ServerCertificateCustomValidationCallback = HttpClientHandler.DangerousAcceptAnyServerCertificateValidator
//方法二
//ServerCertificateCustomValidationCallback = (a, b, c, d) => true
}
});
