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server.go
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server.go
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package gateway
import (
"context"
"fmt"
"net/http"
"strings"
"time"
"github.com/fullstorydev/grpcurl"
"github.com/golang/protobuf/jsonpb"
"github.com/jhump/protoreflect/grpcreflect"
"github.com/zeromicro/go-zero/core/logx"
"github.com/zeromicro/go-zero/core/mr"
"github.com/zeromicro/go-zero/gateway/internal"
"github.com/zeromicro/go-zero/rest"
"github.com/zeromicro/go-zero/rest/httpx"
"github.com/zeromicro/go-zero/zrpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/reflection/grpc_reflection_v1alpha"
)
type (
// Server is a gateway server.
Server struct {
*rest.Server
upstreams []Upstream
timeout time.Duration
processHeader func(http.Header) []string
}
// Option defines the method to customize Server.
Option func(svr *Server)
)
// MustNewServer creates a new gateway server.
func MustNewServer(c GatewayConf, opts ...Option) *Server {
svr := &Server{
Server: rest.MustNewServer(c.RestConf),
upstreams: c.Upstreams,
timeout: c.Timeout,
}
for _, opt := range opts {
opt(svr)
}
return svr
}
// Start starts the gateway server.
func (s *Server) Start() {
logx.Must(s.build())
s.Server.Start()
}
// Stop stops the gateway server.
func (s *Server) Stop() {
s.Server.Stop()
}
func (s *Server) build() error {
if err := s.ensureUpstreamNames(); err != nil {
return err
}
return mr.MapReduceVoid(func(source chan<- interface{}) {
for _, up := range s.upstreams {
source <- up
}
}, func(item interface{}, writer mr.Writer, cancel func(error)) {
up := item.(Upstream)
cli := zrpc.MustNewClient(up.Grpc)
source, err := s.createDescriptorSource(cli, up)
if err != nil {
cancel(fmt.Errorf("%s: %w", up.Name, err))
return
}
methods, err := internal.GetMethods(source)
if err != nil {
cancel(fmt.Errorf("%s: %w", up.Name, err))
return
}
resolver := grpcurl.AnyResolverFromDescriptorSource(source)
for _, m := range methods {
if len(m.HttpMethod) > 0 && len(m.HttpPath) > 0 {
writer.Write(rest.Route{
Method: m.HttpMethod,
Path: m.HttpPath,
Handler: s.buildHandler(source, resolver, cli, m.RpcPath),
})
}
}
methodSet := make(map[string]struct{})
for _, m := range methods {
methodSet[m.RpcPath] = struct{}{}
}
for _, m := range up.Mappings {
if _, ok := methodSet[m.RpcPath]; !ok {
cancel(fmt.Errorf("%s: rpc method %s not found", up.Name, m.RpcPath))
return
}
writer.Write(rest.Route{
Method: strings.ToUpper(m.Method),
Path: m.Path,
Handler: s.buildHandler(source, resolver, cli, m.RpcPath),
})
}
}, func(pipe <-chan interface{}, cancel func(error)) {
for item := range pipe {
route := item.(rest.Route)
s.Server.AddRoute(route)
}
})
}
func (s *Server) buildHandler(source grpcurl.DescriptorSource, resolver jsonpb.AnyResolver,
cli zrpc.Client, rpcPath string) func(http.ResponseWriter, *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
parser, err := internal.NewRequestParser(r, resolver)
if err != nil {
httpx.Error(r.Context(), w, err)
return
}
timeout := internal.GetTimeout(r.Header, s.timeout)
ctx, can := context.WithTimeout(r.Context(), timeout)
defer can()
w.Header().Set(httpx.ContentType, httpx.JsonContentType)
handler := internal.NewEventHandler(w, resolver)
if err := grpcurl.InvokeRPC(ctx, source, cli.Conn(), rpcPath, s.prepareMetadata(r.Header),
handler, parser.Next); err != nil {
httpx.Error(r.Context(), w, err)
}
st := handler.Status
if st.Code() != codes.OK {
httpx.Error(r.Context(), w, st.Err())
}
}
}
func (s *Server) createDescriptorSource(cli zrpc.Client, up Upstream) (grpcurl.DescriptorSource, error) {
var source grpcurl.DescriptorSource
var err error
if len(up.ProtoSets) > 0 {
source, err = grpcurl.DescriptorSourceFromProtoSets(up.ProtoSets...)
if err != nil {
return nil, err
}
} else {
refCli := grpc_reflection_v1alpha.NewServerReflectionClient(cli.Conn())
client := grpcreflect.NewClient(context.Background(), refCli)
source = grpcurl.DescriptorSourceFromServer(context.Background(), client)
}
return source, nil
}
func (s *Server) ensureUpstreamNames() error {
for _, up := range s.upstreams {
target, err := up.Grpc.BuildTarget()
if err != nil {
return err
}
up.Name = target
}
return nil
}
func (s *Server) prepareMetadata(header http.Header) []string {
vals := internal.ProcessHeaders(header)
if s.processHeader != nil {
vals = append(vals, s.processHeader(header)...)
}
return vals
}
// WithHeaderProcessor sets a processor to process request headers.
// The returned headers are used as metadata to invoke the RPC.
func WithHeaderProcessor(processHeader func(http.Header) []string) func(*Server) {
return func(s *Server) {
s.processHeader = processHeader
}
}