common, node: move datadir defaults into package node

node/defaults.go

@@ -0,0 +1,60 @@
+// 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 ""
+}