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用 Lile 創建 gRPC-go 服務

用 Lile 創建 gRPC-go 服務

(金慶的專欄 2017.11)

Lile 是一個工具，用于 Go 語言快速創建 gRPC 服務。
https://github.com/lileio/lile

會自動添加 Prometheus, Zipkin 和 Google PubSub 支持。

go get -u github.com/lileio/lile/...
將安裝所有依賴包，并生成 bin/lile.exe, bin/protoc-gen-lile-server.exe.
另外還需要安裝 protoc.exe.

按照示例創建 users 服務：

E:\gopath\src\github.com
λ lile new jinq0123/users
Creating project in E:\gopath\src\github.com\jinq0123\users
Is this OK? [y]es/[n]o
y
.
├── server
│   ├── server.go
│   └── server_test.go
├── subscribers
│   └── subscribers.go
├── users
│   ├── cmd
│   │   ├── root.go
│   │   ├── serve.go
│   │   ├── subscribe.go
│   │   └── up.go
│   └── main.go
├── users.proto
├── Makefile
├── Dockerfile
├── .travis.yml
└── .gitignore

查看 Makefile, 復制其中 protoc 腳本，將 $$GOPATH 改為 %GOPATH%，運行：

E:\gopath\src\github.com\jinq0123\users
λ protoc -I . users.proto --lile-server_out=. --go_out=plugins=grpc:%GOPATH%/src
2017/11/28 16:59:24 [Creating] server\read.go
2017/11/28 16:59:24 [Creating test] server\read_test.go

protoc-gen-lile-server.exe 將生成 server\read.go, 對應 user.proto 中的方法 Users::Read().
grpc的插件將生成 users.pb.go，與僅僅用 grpc 生成的代碼相同。

D:/Go/bin/go.exe install -v [E:/gopath/src/github.com/jinq0123/users/users]
github.com/jinq0123/users/users
成功: 進程退出代碼 0.

可直接編譯生成 user.exe.

無參數運行則顯示命令行幫助：

E:\gopath\src\github.com\jinq0123\users
λ users
A gRPC based service

Usage:
users [command]

Available Commands:
help        Help about any command
serve       Run the RPC server
subscribe   Subscribe to and process queue messages
up          up runs both RPC and pubub subscribers

Flags:
-h, --help   help for users

Use "users [command] --help" for more information about a command.

用子命令serve啟動服務：

E:\gopath\src\github.com\jinq0123\users
λ users serve
INFO[0000] Serving gRPC on :8000
INFO[0000] Using Zipkin Global tracer
INFO[0000] Prometheus metrics at :9000/metrics

http://localhost:9000/metrics 會顯示

# HELP go_gc_duration_seconds A summary of the GC invocation durations.
# TYPE go_gc_duration_seconds summary
go_gc_duration_seconds{quantile="0"} 0
go_gc_duration_seconds{quantile="0.25"} 0
...

用 grpc-lua 來測試下：

E:\Git\grpc-lua\examples\helloworld (master)
λ lua-cpp.exe
Lua 5.3.4 Copyright (C) 1994-2017 Lua.org, PUC-Rio
> package.path = "../../src/lua/?.lua;" .. package.path
> grpc = require("grpc_lua.grpc_lua")
> grpc.import_proto_file("users.proto")
> stub = grpc.service_stub("localhost:8000", "users.Users")
D1128 17:28:13.711000000 4612 dns_resolver.c:301] Using native dns resolver
> request = {id = "abcd"}
> response, err, cod = stub:sync_request("Read", request)
> cod
2
> insp = require("inspect")
> insp(resonse)
nil
> insp(err)
"not yet implemented"

缺省實現返回 "not yet implemented" 錯誤。更改實現代如下：

func (s UsersServer) Read(ctx context.Context, r *users.Request) (*users.Response, error) {
   // return nil, errors.New("not yet implemented")
   return &users.Response{Id: "Hello, " + r.Id}, nil
}

再次請求：

> response, err, cod = stub:sync_request("Read", request)
> err
Endpoint read failed
...
> response, err, cod = stub:sync_request("Read", request)
> err
nil
> insp(response)
{
id = "Hello, abcd"
}

posted on 2017-11-28 18:47 金慶閱讀(859) 評論(0) 編輯收藏引用所屬分類: 9. 其它

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