345 lines
6.9 KiB
Markdown
345 lines
6.9 KiB
Markdown
## 如何加一个新服务
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以加 `order` 为例（对标现有 `product`）。
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### 0. 安装 goctl
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```bash
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go install github.com/zeromicro/go-zero/tools/goctl@latest
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goctl --version
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go install google.golang.org/protobuf/cmd/protoc-gen-go@latest
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go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@latest
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```
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### 1. 创建 RPC 服务（goctl）
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在仓库根目录执行：
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```bash
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goctl rpc new order
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cd order
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```
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### 2. 将 proto 移到 `proto/` 目录
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`goctl rpc new` 默认把 proto 放在服务根目录（如 `order/order.proto`）。统一挪到 `proto/`：
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```bash
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mkdir proto
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mv order.proto proto/
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```
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### 4. 配置 Zero 兼容 Nacos
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编辑 `order/internal/config/config.go`：
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```go
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package config
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import "github.com/zeromicro/go-zero/zrpc"
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type Config struct {
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zrpc.RpcServerConf
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Nacos NacosConf
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}
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type NacosConf struct {
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Hosts []string
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NamespaceId string `json:",optional"`
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Group string `json:",optional"`
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RegisterIP string `json:",optional"`
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}
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```
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### 5. 配置服务名与监听端口
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`order/etc/order.yaml`：
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```yaml
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Name: order-service # 注册到 Nacos 的 serviceName；BFF Upstream.Target 必须与此一致
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ListenOn: 0.0.0.0:10200
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Nacos:
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Hosts:
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- rnacos:8848
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NamespaceId: test
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Group: LONE_SERVICES
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RegisterIP: order # Docker Compose 里的服务名 / 主机名
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Mysql:
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Host: mysql
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Port: 3306
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User: root
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Password: "123123"
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Database: dms-order
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Charset: utf8mb4
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Prefix:
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```
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### 3. 构建 mod
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编辑 `order/go.mod`
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```go
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go 1.24.3
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require (
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github.com/zeromicro/go-zero v1.10.2
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google.golang.org/grpc v1.80.0
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google.golang.org/protobuf v1.36.11
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)
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```
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```bash
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go mod tidy
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```
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编辑 `order/go.mod` 增加本地包 pkg.local
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```go
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require (
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github.com/zeromicro/go-zero v1.10.2
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google.golang.org/grpc v1.80.0
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google.golang.org/protobuf v1.36.11
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pkg.local v0.0.0
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)
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replace pkg.local => ../pkg
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```
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### 6. 服务注册
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编辑 `order/order.go`：
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```go
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func main() {
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flag.Parse()
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var c config.Config
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conf.MustLoad(*configFile, &c)
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if err := discovery.Init(discovery.Config{
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Hosts: c.Nacos.Hosts,
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NamespaceId: c.Nacos.NamespaceId,
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Group: c.Nacos.Group,
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}); err != nil {
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log.Fatalf("nacos init: %v", err)
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}
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registerIP := c.Nacos.RegisterIP
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port, err := listenPort(c.ListenOn)
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if err != nil {
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log.Fatalf("parse ListenOn: %v", err)
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}
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if err := discovery.Register(discovery.Instance{
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ServiceName: c.Name,
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IP: registerIP,
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Port: port,
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Group: c.Nacos.Group,
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}); err != nil {
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log.Fatalf("nacos register: %v", err)
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}
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defer func() {
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if err := discovery.Deregister(); err != nil {
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log.Printf("nacos deregister: %v", err)
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}
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}()
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ctx := svc.NewServiceContext(c)
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s := zrpc.MustNewServer(c.RpcServerConf, func(grpcServer *grpc.Server) {
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order.RegisterOrderServer(grpcServer, server.NewOrderServer(ctx))
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if c.Mode == service.DevMode || c.Mode == service.TestMode {
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reflection.Register(grpcServer)
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}
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})
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defer s.Stop()
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fmt.Printf("Starting rpc server at %s...\n", c.ListenOn)
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s.Start()
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}
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func listenPort(listenOn string) (uint64, error) {
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_, portStr, err := net.SplitHostPort(listenOn)
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if err != nil {
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return 0, err
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}
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return strconv.ParseUint(portStr, 10, 64)
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}
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```
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编辑 `order/order.go`：增加本地包
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```go
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import (
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"pkg.local/discovery"
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)
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```
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再次执行
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```bash
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go mod tidy
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```
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### 8. 接入 Docker Compose
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在 `deploy/docker-compose.override.yml` 增加服务：
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```yaml
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order:
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image: golang:1.24.3
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volumes:
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- ..:/src
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- go-mod-cache:/go/pkg/mod
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working_dir: /src/order
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command: go run . -f etc/order.yaml
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ports:
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- "10200:10200"
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environment:
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NACOS_SERVER_ADDR: rnacos:8848
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depends_on:
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- rnacos
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```
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### 9. 生成 ProtoSet 给 BFF
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```bash
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protoc --include_imports --proto_path=proto --descriptor_set_out=../bff/etc/order.pb order.proto
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```
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### 10. 在 BFF 配 Upstream + Mapping
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编辑 `bff/etc/bff.yaml`，增加一段（go-zero gateway **每个 RPC 都要写 Mapping**）：
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```yaml
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- Name: order
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Grpc:
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Target: order-service # 必须等于 order.yaml 的 Name
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Timeout: 5000
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ProtoSets:
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- etc/order.pb
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Mappings:
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- Method: post
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Path: /admin/v3/order/ping
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RpcPath: order.Order/Ping
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```
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### 11. 加接口需要
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只改业务逻辑（`internal/logic/`）不必跑 goctl。
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改 `proto/order.proto`（新增/改名 RPC、改字段等）后，按文末「三条命令何时用」处理；
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若 HTTP 路径有变，再改第 10 步的 Mapping。
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---
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### 命令 ①：生成服务端 pb / grpc
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```bash
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protoc -I. -I../pkg/third_party --go_out=. --go-grpc_out=. proto/order.proto
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```
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**什么时候跑：**
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- 只改 **校验规则**（必填/长度/范围等）→ **只跑这条**
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- 增删改字段、增删 RPC → 也要跑（服务端描述符要更新）
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### 命令 ②：生成 BFF ProtoSet
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```bash
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protoc -I. -I../pkg/third_party --descriptor_set_out=../bff/etc/product.pb --include_imports proto/order.proto
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```
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**什么时候跑：**
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- 增删改 **字段**（BFF gateway 编解码需要）
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- 增删 **RPC**
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### 命令 ③：goctl 生成/更新脚手架
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```bash
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goctl rpc protoc proto/order.proto --go_out=. --go-grpc_out=. --zrpc_out=.
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```
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**什么时候跑：**
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- **新增 RPC**：需要生成 `internal/logic`、更新 `server` / `productclient` 等
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- 注意：可能覆盖已改过的 `product.go` 等，生成后对比合并；也可用手写 logic/server 代替
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## Proto 常用校验规则（protovalidate）
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文档：https://protovalidate.com/schemas/standard-rules/
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依赖：`import "buf/validate/validate.proto";`，服务启动挂 `pkg.local/validate` 拦截器。
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### 必填字符串
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```protobuf
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string name = 1 [(buf.validate.field).string = {min_len: 1, max_len: 256}];
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```
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`min_len: 1` 表示不能为空串。
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### 可选字符串（仅限长度）
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```protobuf
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string subhead = 2 [(buf.validate.field).string = {max_len: 255}];
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```
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空串可通过；有内容时限制最大长度。
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### 必填数值（含 0 合法）
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```protobuf
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double price = 6 [(buf.validate.field).double = {gte: 0}];
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int32 period_validity = 16 [(buf.validate.field).int32 = {gte: 0}];
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```
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### 非必填数值（0 表示未传，跳过校验）
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```protobuf
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double store_price = 7 [(buf.validate.field) = {
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ignore: IGNORE_IF_ZERO_VALUE,
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double: {gte: 0}
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}];
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```
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有值时仍要求 `>= 0`；未传/为 0 不校验。
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### 枚举 / 固定取值（0 表示未传）
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```protobuf
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uint32 type = 19 [(buf.validate.field) = {
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ignore: IGNORE_IF_ZERO_VALUE,
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uint32: {in: [1, 2, 3]}
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}];
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uint32 sales_model = 4 [(buf.validate.field) = {
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ignore: IGNORE_IF_ZERO_VALUE,
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uint32: {in: [1, 2]}
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}];
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```
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### ID 必须大于 0
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```protobuf
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int64 id = 1 [(buf.validate.field).int64 = {gt: 0}];
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```
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### 无规则字段
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```protobuf
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uint32 number = 20; // 不做 protovalidate
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```
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### 删除字段编号（避免复用）
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```protobuf
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// reserved 2;
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```
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业务条件校验（如「普通商品必须带齐价格」）仍写在 `internal/logic`，不要全塞进 proto。
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