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+// Copyright 2016 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 (
+ "os"
+ "os/user"
+ "path/filepath"
+ "runtime"
+)
+
+const (
+ DefaultIPCSocket = "geth.ipc" // Default (relative) name of the IPC RPC socket
+ DefaultHTTPHost = "localhost" // Default host interface for the HTTP RPC server
+ DefaultHTTPPort = 8545 // Default TCP port for the HTTP RPC server
+ DefaultWSHost = "localhost" // Default host interface for the websocket RPC server
+ DefaultWSPort = 8546 // Default TCP port for the websocket RPC server
+)
+
+// DefaultDataDir is the default data directory to use for the databases and other
+// persistence requirements.
+func DefaultDataDir() string {
+ // Try to place the data folder in the user's home dir
+ home := homeDir()
+ if home != "" {
+ if runtime.GOOS == "darwin" {
+ return filepath.Join(home, "Library", "Ethereum")
+ } else if runtime.GOOS == "windows" {
+ return filepath.Join(home, "AppData", "Roaming", "Ethereum")
+ } else {
+ return filepath.Join(home, ".ethereum")
+ }
+ }
+ // As we cannot guess a stable location, return empty and handle later
+ return ""
+}
+
+func homeDir() string {
+ if home := os.Getenv("HOME"); home != "" {
+ return home
+ }
+ if usr, err := user.Current(); err == nil {
+ return usr.HomeDir
+ }
+ return ""
+}