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package rpc // import "collectd.org/rpc"
import (
"context"
"io"
pb "collectd.org/rpc/proto"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
)
// RegisterServer registers the implementation srv with the gRPC instance s.
func RegisterServer(s *grpc.Server, srv Interface) {
pb.RegisterCollectdServer(s, &server{
Interface: srv,
})
}
// Type server implements pb.CollectdServer using the Go implementation of
// rpc.Interface.
type server struct {
Interface
}
// PutValues reads ValueLists from stream and calls the Write() implementation
// on each one.
func (s *server) PutValues(stream pb.Collectd_PutValuesServer) error {
for {
req, err := stream.Recv()
if err == io.EOF {
break
}
if err != nil {
return err
}
vl, err := UnmarshalValueList(req.GetValueList())
if err != nil {
return err
}
if err := s.Write(stream.Context(), vl); err != nil {
return grpc.Errorf(codes.Internal, "Write(%v): %v", vl, err)
}
}
return stream.SendAndClose(&pb.PutValuesResponse{})
}
// QueryValues calls the Query() implementation and streams all ValueLists from
// the channel back to the client.
func (s *server) QueryValues(req *pb.QueryValuesRequest, stream pb.Collectd_QueryValuesServer) error {
id := UnmarshalIdentifier(req.GetIdentifier())
ctx, cancel := context.WithCancel(stream.Context())
defer cancel()
ch, err := s.Query(ctx, id)
if err != nil {
return grpc.Errorf(codes.Internal, "Query(%v): %v", id, err)
}
for vl := range ch {
pbVL, err := MarshalValueList(vl)
if err != nil {
return err
}
res := &pb.QueryValuesResponse{
ValueList: pbVL,
}
if err := stream.Send(res); err != nil {
return err
}
}
return nil
}
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