/
service.go
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/
service.go
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// Copyright 2021 Luis Guillén Civera <luisguillenc@gmail.com>. See LICENSE.
package finder
import (
"context"
"github.com/google/uuid"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/peer"
"google.golang.org/grpc/status"
"github.com/luids-io/api/dnsutil"
"github.com/luids-io/api/dnsutil/grpc/encoding"
"github.com/luids-io/api/dnsutil/grpc/pb"
"github.com/luids-io/core/yalogi"
)
// Service implements a grpc service wrapper.
type Service struct {
logger yalogi.Logger
finder dnsutil.Finder
}
// ServiceOption is used for service configuration.
type ServiceOption func(*serviceOpts)
type serviceOpts struct {
logger yalogi.Logger
}
var defaultServiceOpts = serviceOpts{logger: yalogi.LogNull}
// SetServiceLogger option allows set a custom logger.
func SetServiceLogger(l yalogi.Logger) ServiceOption {
return func(o *serviceOpts) {
if l != nil {
o.logger = l
}
}
}
// NewService returns a new Service.
func NewService(f dnsutil.Finder, opt ...ServiceOption) *Service {
opts := defaultServiceOpts
for _, o := range opt {
o(&opts)
}
return &Service{finder: f, logger: opts.logger}
}
// RegisterServer registers a service in the grpc server.
func RegisterServer(server *grpc.Server, service *Service) {
pb.RegisterFinderServer(server, service)
}
// GetResolv implements grpc interface.
func (s *Service) GetResolv(ctx context.Context, req *pb.GetResolvRequest) (*pb.GetResolvResponse, error) {
id := req.GetId()
if id == "" {
s.logger.Warnf("service.dnsutil.finder: [peer=%s] getresolv(): id is empty", getPeerAddr(ctx))
return nil, s.mapError(dnsutil.ErrBadRequest)
}
rid, err := uuid.Parse(id)
if err != nil {
s.logger.Warnf("service.dnsutil.finder: [peer=%s] getresolv(%v): %v", getPeerAddr(ctx), id, err)
return nil, s.mapError(dnsutil.ErrBadRequest)
}
rd, exists, err := s.finder.GetResolv(ctx, rid)
if err != nil {
s.logger.Warnf("service.dnsutil.finder: [peer=%s] getresolv(%s): %v", getPeerAddr(ctx), id, err)
return nil, s.mapError(err)
}
if !exists {
return nil, status.Error(codes.NotFound, "resolv not found")
}
rdpb := &pb.ResolvData{}
err = encoding.ResolvDataPB(&rd, rdpb)
if err != nil {
s.logger.Warnf("service.dnsutil.finder: [peer=%s] getresolv(%s): encoding pb: %v", getPeerAddr(ctx), id, err)
return nil, s.mapError(err)
}
return &pb.GetResolvResponse{Data: rdpb}, nil
}
// ListResolvs implements grpc interface.
func (s *Service) ListResolvs(ctx context.Context, req *pb.ListResolvsRequest) (*pb.ListResolvsResponse, error) {
// get request
max := int(req.GetMax())
if max < 0 {
s.logger.Warnf("service.dnsutil.finder: [peer=%s] listresolvs(): bad max", getPeerAddr(ctx))
return nil, s.mapError(dnsutil.ErrBadRequest)
}
filters := make([]dnsutil.ResolvsFilter, 0, len(req.GetFilters()))
for _, rfpb := range req.GetFilters() {
var rf dnsutil.ResolvsFilter
err := encoding.ResolvsFilter(rfpb, &rf)
if err != nil {
s.logger.Warnf("service.dnsutil.finder: [peer=%s] listresolvs(): bad filter: %v", getPeerAddr(ctx), err)
return nil, s.mapError(dnsutil.ErrBadRequest)
}
filters = append(filters, rf)
}
//do list
data, next, err := s.finder.ListResolvs(ctx, filters, req.GetReverse(), max, req.GetNext())
if err != nil {
s.logger.Warnf("service.dnsutil.finder: [peer=%s] listresolvs(): %v", getPeerAddr(ctx), err)
return nil, s.mapError(err)
}
//prepare response
resp := &pb.ListResolvsResponse{
Next: next,
Data: make([]*pb.ResolvData, 0, len(data)),
}
for _, rd := range data {
rdpb := &pb.ResolvData{}
err := encoding.ResolvDataPB(&rd, rdpb)
if err != nil {
s.logger.Warnf("service.dnsutil.finder: [peer=%s] listresolvs(): %v", getPeerAddr(ctx), err)
return nil, s.mapError(err)
}
resp.Data = append(resp.Data, rdpb)
}
return resp, nil
}
//mapping errors
func (s *Service) mapError(err error) error {
switch err {
case dnsutil.ErrCanceledRequest:
return status.Error(codes.Canceled, err.Error())
case dnsutil.ErrBadRequest:
return status.Error(codes.InvalidArgument, err.Error())
case dnsutil.ErrNotSupported:
return status.Error(codes.Unimplemented, err.Error())
case dnsutil.ErrUnavailable:
return status.Error(codes.Unavailable, err.Error())
default:
return status.Error(codes.Internal, dnsutil.ErrInternal.Error())
}
}
func getPeerAddr(ctx context.Context) (paddr string) {
p, ok := peer.FromContext(ctx)
if ok {
paddr = p.Addr.String()
}
return
}