add necessary code base

1 files changed, 63 insertions, 0 deletions

diff --git a/node/errors.go b/node/errors.go
new file mode 100644
index 0000000..2e0dadc
--- /dev/null
+++ b/node/errors.go
@@ -0,0 +1,63 @@
+// Copyright 2015 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package node
+
+import (
+	"errors"
+	"fmt"
+	"reflect"
+	"syscall"
+)
+
+var (
+	ErrDatadirUsed    = errors.New("datadir already used by another process")
+	ErrNodeStopped    = errors.New("node not started")
+	ErrNodeRunning    = errors.New("node already running")
+	ErrServiceUnknown = errors.New("unknown service")
+
+	datadirInUseErrnos = map[uint]bool{11: true, 32: true, 35: true}
+)
+
+func convertFileLockError(err error) error {
+	if errno, ok := err.(syscall.Errno); ok && datadirInUseErrnos[uint(errno)] {
+		return ErrDatadirUsed
+	}
+	return err
+}
+
+// DuplicateServiceError is returned during Node startup if a registered service
+// constructor returns a service of the same type that was already started.
+type DuplicateServiceError struct {
+	Kind reflect.Type
+}
+
+// Error generates a textual representation of the duplicate service error.
+func (e *DuplicateServiceError) Error() string {
+	return fmt.Sprintf("duplicate service: %v", e.Kind)
+}
+
+// StopError is returned if a Node fails to stop either any of its registered
+// services or itself.
+type StopError struct {
+	Server   error
+	Services map[reflect.Type]error
+}
+
+// Error generates a textual representation of the stop error.
+func (e *StopError) Error() string {
+	return fmt.Sprintf("server: %v, services: %v", e.Server, e.Services)
+}