开发一个 API 网关,代理 https://www.cnblogs.com/aquester/p/17882070.html 中的 RPC 服务。
网关完整源代码
// file: main.go
package main
import (
"flag"
"fmt"
"github.com/zeromicro/go-zero/core/conf"
"github.com/zeromicro/go-zero/gateway"
)
var configFile = flag.String("f", "etc/gateway.yaml", "the config file")
func main() {
var c gateway.GatewayConf
flag.Parse()
conf.MustLoad(*configFile, &c)
server := gateway.MustNewServer(c)
defer server.Stop()
fmt.Printf("Starting gateway on %s:%d...\n", c.Host, c.Port)
server.Start()
}
上述代码可以使用 go-zero 的脚手架工具 goctl 自动生成,比如:
goctl gateway -dir gateway
同时会生成网关配置文件 gateway.yaml:
# cat etc/gateway.yaml
Name: gateway-example # gateway name
Host: localhost # gateway host
Port: 8888 # gateway port
Upstreams: # upstreams
- Grpc: # grpc upstream
Target: 0.0.0.0:8080 # grpc target,the direct grpc server address,for only one node
# Endpoints: [0.0.0.0:8080,192.168.120.1:8080] # grpc endpoints, the grpc server address list, for multiple nodes
# Etcd: # etcd config, if you want to use etcd to discover the grpc server address
# Hosts: [127.0.0.1:2378,127.0.0.1:2379] # etcd hosts
# Key: greet.grpc # the discovery key
# protoset mode
ProtoSets:
- hello.pb
# Mappings can also be written in proto options
# Mappings: # routes mapping
# - Method: get
# Path: /ping
# RpcPath: hello.Hello/Ping
编译网关源码生成可执行程序文件
# cat Makefile
all: gateway
gateway: main.go
go build -o gateway main.go
clean:
rm -f gateway
生成被代理 RPC 服务的 pb 文件
protoc --descriptor_set_out=add.pb add.proto
add.pb 是一个二进制文件。
编辑网关配置文件 gateway.yaml
# cat etc/gateway.yaml
Name: go-zero-gateway # 网关名
Host: 0.0.0.0 # 网关的服务地址
Port: 8888 # 网关的服务端口
Upstreams: # 被网关代理的上游服务
- Grpc: # gRPC 服务列表
Etcd:
Hosts:
- 127.0.0.1:2379 # etcd 服务地址和端口(Endpoints)
Key: add.rpc
ProtoSets: # 这里为被代理 RPC 服务的 pb 文件列表
- /root/go-zero/gateway/proto/add.pb
Mappings: # Mappings can also be written in proto options
- Method: get # HTTP 方法
Path: /add # HTTP 路径
RpcPath: add.Adder/add # 对应的 RPC 路径(第一个 add 为包名,Adder 为 service 名,后一个 add 为 service 中的方法名)
启动网关
./gateway
通过网关访问 RPC 服务
# curl -i '127.0.0.1:8888/add'
HTTP/1.1 200 OK
Content-Type: application/json; charset=utf-8
Traceparent: 00-a53f71dd9eb638c5c2af03eb633a56be-dad8426820c63b1d-00
Date: Fri, 08 Dec 2023 02:08:39 GMT
Content-Length: 9
{"sum":0}
# curl -i '127.0.0.1:8888/add?a=1&b=2'
HTTP/1.1 200 OK
Content-Type: application/json; charset=utf-8
Traceparent: 00-0df2bbd651938b704c532a01bb2f16e3-27c5267777c8cc06-00
Date: Fri, 08 Dec 2023 02:08:47 GMT
Content-Length: 9
{"sum":3}
标签:网关,grpc,zero,add,API,go,gateway
From: https://www.cnblogs.com/aquester/p/17884580.html