/
gateway.go
293 lines (248 loc) · 7.59 KB
/
gateway.go
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package gateway
import (
"context"
"crypto/tls"
"crypto/x509"
"fmt"
"github.com/dotnetage/go-titan/config"
"io/ioutil"
"net/http"
"os"
"os/signal"
"syscall"
"google.golang.org/grpc/credentials"
grpc_middleware "github.com/grpc-ecosystem/go-grpc-middleware"
grpc_zap "github.com/grpc-ecosystem/go-grpc-middleware/logging/zap"
"github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
"google.golang.org/grpc"
"google.golang.org/protobuf/encoding/protojson"
"go.uber.org/zap"
)
type (
Middleware func(http.Handler) http.Handler
// Gateway 网关定义
Gateway interface {
// Options 返回网关配置
Options() *Options
// Use 添加中间件实例
Use(middlewares ...Middleware) Gateway
// Handle 添加Http处理器
Handle(method, pattern string, handler runtime.HandlerFunc) Gateway
// Transport 向网关注册处理器方法
Transport(serverName string, registerFunc ...ClientRegisterFunc) Gateway
// Start 起动网关
Start()
}
routFunc func(r *runtime.ServeMux) error
ClientRegisterFunc func(context.Context, *runtime.ServeMux, string, []grpc.DialOption) (err error)
defaultGateway struct {
options *Options
httpServer *http.Server
logger *zap.Logger
clientRegisters map[string][]ClientRegisterFunc
handlers []routFunc
middlewares []Middleware
}
)
func New(opts ...Option) Gateway {
b := &defaultGateway{
options: newOptions(opts...),
handlers: make([]routFunc, 0),
clientRegisters: make(map[string][]ClientRegisterFunc),
middlewares: make([]Middleware, 0),
}
b.logger = b.options.Logger
return b
}
func (g *defaultGateway) Options() *Options {
return g.options
}
func (b *defaultGateway) Handle(method, pattern string, handler runtime.HandlerFunc) Gateway {
b.handlers = append(b.handlers, func(r *runtime.ServeMux) error {
return r.HandlePath(method, pattern, handler)
})
return b
}
func (b *defaultGateway) Use(middlewares ...Middleware) Gateway {
for _, middleware := range middlewares {
b.middlewares = append(b.middlewares, middleware)
}
return b
}
func (a *defaultGateway) Transport(serverName string, registerFunc ...ClientRegisterFunc) Gateway {
a.clientRegisters[serverName] = registerFunc
return a
}
func (b *defaultGateway) Start() {
// 创建一个可取消的上下文(如:请求发到一半可随时取消)
ctx := context.Background()
ctx, cancel := context.WithCancel(ctx)
defer cancel()
// 批量注册客户拨号连接
gwmux := runtime.NewServeMux(defaultMarshalerOption())
if len(b.clientRegisters) > 0 && len(b.options.Transports) == 0 {
b.logger.Fatal("没有指定gRPC服务地址")
return
}
for serverName, registerFunc := range b.clientRegisters {
endpoint := b.options.Transports[0]
if endpoint.Name != serverName {
for _, ep := range b.options.Transports {
if ep.Name == serverName {
endpoint = ep
break
}
}
}
b.logger.Sugar().Infof("正在连接服务 %v", serverName)
for _, regFnc := range registerFunc {
// 这里不能传入 Cancel 的上下文,否则就会持续连接失败
err := regFnc(context.Background(),
gwmux,
endpoint.Addr,
buildDialOptions(endpoint, b.logger))
if err != nil {
b.logger.Sugar().Fatalf("连接服务失败 %v", err)
}
}
}
// 附加的路由
if len(b.handlers) > 0 {
for _, h := range b.handlers {
if e := h(gwmux); e != nil {
b.logger.Fatal(e.Error())
}
}
}
defaultHandler := func() http.Handler { return gwmux }()
// 附加中间件
if len(b.middlewares) > 0 {
for i := range b.middlewares {
m := b.middlewares[len(b.middlewares)-i-1]
defaultHandler = m(defaultHandler)
}
}
b.httpServer = &http.Server{
Addr: b.options.ServiceDesc.EndPoint.Addr,
Handler: b.options.CORS.Allows(defaultHandler),
}
stop := make(chan os.Signal)
signal.Notify(stop, syscall.SIGTERM, syscall.SIGINT)
go func() {
defer signal.Stop(stop)
<-stop
cancel()
b.logger.Info("尝试关闭网关服务...")
if err := b.httpServer.Shutdown(context.Background()); err != nil {
b.logger.Sugar().Fatalf("关闭网关服务器失败:%v", err)
}
//
//if b.resolver != nil {
// b.resolver.Close()
//}
}()
b.logger.Sugar().Infof("正在起动网关,运行于%s", b.httpServer.Addr)
if b.options.ServiceDesc.EndPoint.TLS {
// 启用https网关
b.logger.Info("启用TLS的安全连接")
if err := b.httpServer.ListenAndServeTLS(b.options.ServiceDesc.EndPoint.CertFile,
b.options.ServiceDesc.EndPoint.KeyFile); err != http.ErrServerClosed {
b.logger.Sugar().Fatalf("无法起动网关 %v", err)
// panic(err)
}
} else {
b.logger.Info("启用不安全连接")
if err := b.httpServer.ListenAndServe(); err != http.ErrServerClosed {
b.logger.Sugar().Fatalf("无法起动网关 %v", err)
}
}
b.logger.Sugar().Info("网关服务已下线")
}
func defaultMarshalerOption() runtime.ServeMuxOption {
return runtime.WithMarshalerOption(
runtime.MIMEWildcard,
&runtime.JSONPb{
MarshalOptions: protojson.MarshalOptions{
UseEnumNumbers: true, // 枚举字段的值使用数字
UseProtoNames: true,
// 传给 clients 的 json key 使用下划线 `_`
// AccessToken string `protobuf:"bytes,1,opt,name=access_token,json=accessToken,proto3" json:"access_token,omitempty"`
// 这里说明应使用 access_token
},
UnmarshalOptions: protojson.UnmarshalOptions{
DiscardUnknown: true, // 忽略 client 发送的不存在的 poroto 字段
},
},
)
}
func buildDialOptions(endpoint *config.EndPoint, logger *zap.Logger) []grpc.DialOption {
grpc_zap.ReplaceGrpcLoggerV2(logger)
opts := []grpc.DialOption{
grpc.WithUnaryInterceptor(grpc_middleware.ChainUnaryClient(
grpc_zap.UnaryClientInterceptor(logger),
//grpc_retry.UnaryClientInterceptor(), // 服务重试
//grpc_opentracing.UnaryClientInterceptor(), // 链路跟踪
//grpc_prometheus.UnaryClientInterceptor,
)),
grpc.WithStreamInterceptor(
grpc_middleware.ChainStreamClient(
grpc_zap.StreamClientInterceptor(logger),
//grpc_retry.StreamClientInterceptor(),
)),
// grpc.WithDefaultServiceConfig(`{"loadBalancingConfig": [{"round_robin":{}}]}`), // 已经支持负载均衡
}
if endpoint.TLS {
// creds, _ := credentials.NewClientTLSFromFile(endpoint.CertFile, "")
creds, err := loadTLSCredentials(endpoint.CAFile,
endpoint.CertFile,
endpoint.KeyFile)
if err != nil {
logger.Fatal(err.Error())
}
opts = append(opts, grpc.WithTransportCredentials(creds))
} else {
opts = append(opts, grpc.WithInsecure())
}
return opts
}
func loadTLSCredentials(caFile, clientCertFile, clientKeyFile string) (credentials.TransportCredentials, error) {
// Load certificate of the CA who signed server's certificate
pemServerCA, err := ioutil.ReadFile(caFile)
if err != nil {
return nil, err
}
certPool := x509.NewCertPool()
if !certPool.AppendCertsFromPEM(pemServerCA) {
return nil, fmt.Errorf("failed to add server CA's certificate")
}
// Load client's certificate and private key
clientCert, err := tls.LoadX509KeyPair(clientCertFile, clientKeyFile)
if err != nil {
return nil, err
}
// Create the credentials and return it
c := &tls.Config{
Certificates: []tls.Certificate{clientCert},
RootCAs: certPool,
}
return credentials.NewTLS(c), nil
}
//// OpenTracing 启用链路跟踪
//func (a *ApiGateway) OpenTracing(addr string) *ApiGateway {
// if addr != "" {
// a.config.OpenTracing.Addr = addr
// }
//
// if a.config.EndPoint.Addr != "" {
//
// opt, err := NewZipkinClientOption(a.name,
// a.config.EndPoint.Addr,
// a.logger)
//
// if err == nil {
// a.dialOptions = append(a.dialOptions, opt)
// }
// }
// return a
//}
//