feature: basic management service implementation (#44)

* feat: basic management service implementation [FAILING TESTS]

* test: fix healthcheck test

* test: #39 add peer registration endpoint test

* feat: #39 add setup key handling

* feat: #39 add peer management store persistence

* refactor: extract config read/write to the utility package

* refactor: move file contents copy to the utility package

* refactor: use Accounts instead of Users in the Store

* feature: add management server Docker file

* refactor: introduce datadir instead of config

* chore: use filepath.Join to concat filepaths instead of string concat

* refactor: move stop channel to the root

* refactor: move stop channel to the root

* review: fix PR review notes

Co-authored-by: braginini <hello@wiretrustee.com>

management/server.go

@@ -0,0 +1,39 @@
+package management
+
+import (
+	"context"
+	"github.com/wiretrustee/wiretrustee/management/proto"
+	"google.golang.org/grpc/status"
+)
+
+// Server an instance of a Management server
+type Server struct {
+	Store *Store
+}
+
+// NewServer creates a new Management server
+func NewServer(dataDir string) (*Server, error) {
+	store, err := NewStore(dataDir)
+	if err != nil {
+		return nil, err
+	}
+	return &Server{
+		Store: store,
+	}, nil
+}
+
+// RegisterPeer adds a peer to the Store. Returns 404 in case the provided setup key doesn't exist
+func (s *Server) RegisterPeer(ctx context.Context, req *proto.RegisterPeerRequest) (*proto.RegisterPeerResponse, error) {
+
+	err := s.Store.AddPeer(req.SetupKey, req.Key)
+	if err != nil {
+		return &proto.RegisterPeerResponse{}, status.Errorf(404, "provided setup key doesn't exists")
+	}
+
+	return &proto.RegisterPeerResponse{}, nil
+}
+
+// IsHealthy indicates whether the service is healthy
+func (s *Server) IsHealthy(ctx context.Context, req *proto.Empty) (*proto.Empty, error) {
+	return &proto.Empty{}, nil
+}