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server.go
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server.go
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package metadata
import (
"bytes"
"compress/gzip"
"context"
"fmt"
"io/ioutil"
"sync"
"github.com/golang/protobuf/proto"
dpb "github.com/golang/protobuf/protoc-gen-go/descriptor"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
protoreflect "google.golang.org/protobuf/reflect/protoreflect"
"google.golang.org/protobuf/reflect/protoregistry"
descriptorpb "google.golang.org/protobuf/types/descriptorpb"
)
//go:generate protoc --proto_path=. --proto_path=../../third_party --go_out=paths=source_relative:. --go-grpc_out=paths=source_relative:. --go-http_out=paths=source_relative:. metadata.proto
// Server is api meta server
type Server struct {
UnimplementedMetadataServer
srv *grpc.Server
lock sync.Mutex
services map[string]*descriptorpb.FileDescriptorSet
methods map[string][]string
}
// NewServer create server instance
func NewServer(srv *grpc.Server) *Server {
return &Server{
srv: srv,
services: make(map[string]*descriptorpb.FileDescriptorSet),
methods: make(map[string][]string),
}
}
func (s *Server) load() error {
if len(s.services) > 0 {
return nil
}
if s.srv != nil {
for name, info := range s.srv.GetServiceInfo() {
fdenc, ok := parseMetadata(info.Metadata)
if !ok {
return fmt.Errorf("invalid service %s metadata", name)
}
fd, err := decodeFileDesc(fdenc)
if err != nil {
return err
}
protoSet, err := allDependency(fd)
if err != nil {
return err
}
s.services[name] = &dpb.FileDescriptorSet{File: protoSet}
for _, method := range info.Methods {
s.methods[name] = append(s.methods[name], method.Name)
}
}
return nil
}
var err error
protoregistry.GlobalFiles.RangeFiles(func(fd protoreflect.FileDescriptor) bool {
if fd.Services() != nil {
for i := 0; i < fd.Services().Len(); i++ {
svc := fd.Services().Get(i)
fdp, e := fileDescriptorProto(fd.Path())
if e != nil {
err = e
return false
}
fdps, e := allDependency(fdp)
if e != nil {
err = e
return false
}
s.services[string(svc.FullName())] = &dpb.FileDescriptorSet{File: fdps}
if svc.Methods() != nil {
for j := 0; j < svc.Methods().Len(); j++ {
method := svc.Methods().Get(j)
s.methods[string(svc.FullName())] = append(s.methods[string(svc.FullName())], string(method.Name()))
}
}
}
}
return true
})
return err
}
// ListServices return all services
func (s *Server) ListServices(ctx context.Context, in *ListServicesRequest) (*ListServicesReply, error) {
s.lock.Lock()
defer s.lock.Unlock()
if err := s.load(); err != nil {
return nil, err
}
reply := new(ListServicesReply)
for name := range s.services {
reply.Services = append(reply.Services, name)
}
for name, methods := range s.methods {
for _, method := range methods {
reply.Methods = append(reply.Methods, fmt.Sprintf("/%s/%s", name, method))
}
}
return reply, nil
}
// GetServiceDesc return service meta by name
func (s *Server) GetServiceDesc(ctx context.Context, in *GetServiceDescRequest) (*GetServiceDescReply, error) {
s.lock.Lock()
defer s.lock.Unlock()
if err := s.load(); err != nil {
return nil, err
}
fds, ok := s.services[in.Name]
if !ok {
return nil, status.Errorf(codes.NotFound, "service %s not found", in.Name)
}
return &GetServiceDescReply{FileDescSet: fds}, nil
}
// parseMetadata finds the file descriptor bytes specified meta.
// For SupportPackageIsVersion4, m is the name of the proto file, we
// call proto.FileDescriptor to get the byte slice.
// For SupportPackageIsVersion3, m is a byte slice itself.
func parseMetadata(meta interface{}) ([]byte, bool) {
// Check if meta is the file name.
if fileNameForMeta, ok := meta.(string); ok {
return proto.FileDescriptor(fileNameForMeta), true
}
// Check if meta is the byte slice.
if enc, ok := meta.([]byte); ok {
return enc, true
}
return nil, false
}
// decodeFileDesc does decompression and unmarshalling on the given
// file descriptor byte slice.
func decodeFileDesc(enc []byte) (*dpb.FileDescriptorProto, error) {
raw, err := decompress(enc)
if err != nil {
return nil, fmt.Errorf("failed to decompress enc: %v", err)
}
fd := new(dpb.FileDescriptorProto)
if err := proto.Unmarshal(raw, fd); err != nil {
return nil, fmt.Errorf("bad descriptor: %v", err)
}
return fd, nil
}
func allDependency(fd *dpb.FileDescriptorProto) ([]*dpb.FileDescriptorProto, error) {
var files []*dpb.FileDescriptorProto
for _, dep := range fd.Dependency {
fdDep, err := fileDescriptorProto(dep)
if err != nil {
return nil, err
}
temp, err := allDependency(fdDep)
if err != nil {
return nil, err
}
files = append(files, temp...)
}
files = append(files, fd)
return files, nil
}
// decompress does gzip decompression.
func decompress(b []byte) ([]byte, error) {
r, err := gzip.NewReader(bytes.NewReader(b))
if err != nil {
return nil, fmt.Errorf("bad gzipped descriptor: %v", err)
}
out, err := ioutil.ReadAll(r)
if err != nil {
return nil, fmt.Errorf("bad gzipped descriptor: %v", err)
}
return out, nil
}
func fileDescriptorProto(path string) (*dpb.FileDescriptorProto, error) {
fdenc := proto.FileDescriptor(path)
fdDep, err := decodeFileDesc(fdenc)
if err != nil {
return nil, err
}
return fdDep, nil
}