node: customizable protocol and service stacks

node/config_test.go

@@ -0,0 +1,120 @@
+// 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 (
+	"bytes"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/ethereum/go-ethereum/crypto"
+)
+
+// Tests that datadirs can be successfully created, be them manually configured
+// ones or automatically generated temporary ones.
+func TestDatadirCreation(t *testing.T) {
+	// Create a temporary data dir and check that it can be used by a node
+	dir, err := ioutil.TempDir("", "")
+	if err != nil {
+		t.Fatalf("failed to create manual data dir: %v", err)
+	}
+	defer os.RemoveAll(dir)
+
+	if _, err := New(&Config{DataDir: dir}); err != nil {
+		t.Fatalf("failed to create stack with existing datadir: %v", err)
+	}
+	// Generate a long non-existing datadir path and check that it gets created by a node
+	dir = filepath.Join(dir, "a", "b", "c", "d", "e", "f")
+	if _, err := New(&Config{DataDir: dir}); err != nil {
+		t.Fatalf("failed to create stack with creatable datadir: %v", err)
+	}
+	if _, err := os.Stat(dir); err != nil {
+		t.Fatalf("freshly created datadir not accessible: %v", err)
+	}
+	// Verify that an impossible datadir fails creation
+	file, err := ioutil.TempFile("", "")
+	if err != nil {
+		t.Fatalf("failed to create temporary file: %v", err)
+	}
+	defer os.Remove(file.Name())
+
+	dir = filepath.Join(file.Name(), "invalid/path")
+	if _, err := New(&Config{DataDir: dir}); err == nil {
+		t.Fatalf("protocol stack created with an invalid datadir")
+	}
+}
+
+// Tests that node keys can be correctly created, persisted, loaded and/or made
+// ephemeral.
+func TestNodeKeyPersistency(t *testing.T) {
+	// Create a temporary folder and make sure no key is present
+	dir, err := ioutil.TempDir("", "")
+	if err != nil {
+		t.Fatalf("failed to create temporary data directory: %v", err)
+	}
+	defer os.RemoveAll(dir)
+
+	if _, err := os.Stat(filepath.Join(dir, datadirPrivateKey)); err == nil {
+		t.Fatalf("non-created node key already exists")
+	}
+	// Configure a node with a preset key and ensure it's not persisted
+	key, err := crypto.GenerateKey()
+	if err != nil {
+		t.Fatalf("failed to generate one-shot node key: %v", err)
+	}
+	if _, err := New(&Config{DataDir: dir, PrivateKey: key}); err != nil {
+		t.Fatalf("failed to create empty stack: %v", err)
+	}
+	if _, err := os.Stat(filepath.Join(dir, datadirPrivateKey)); err == nil {
+		t.Fatalf("one-shot node key persisted to data directory")
+	}
+	// Configure a node with no preset key and ensure it is persisted this time
+	if _, err := New(&Config{DataDir: dir}); err != nil {
+		t.Fatalf("failed to create newly keyed stack: %v", err)
+	}
+	if _, err := os.Stat(filepath.Join(dir, datadirPrivateKey)); err != nil {
+		t.Fatalf("node key not persisted to data directory: %v", err)
+	}
+	key, err = crypto.LoadECDSA(filepath.Join(dir, datadirPrivateKey))
+	if err != nil {
+		t.Fatalf("failed to load freshly persisted node key: %v", err)
+	}
+	blob1, err := ioutil.ReadFile(filepath.Join(dir, datadirPrivateKey))
+	if err != nil {
+		t.Fatalf("failed to read freshly persisted node key: %v", err)
+	}
+	// Configure a new node and ensure the previously persisted key is loaded
+	if _, err := New(&Config{DataDir: dir}); err != nil {
+		t.Fatalf("failed to create previously keyed stack: %v", err)
+	}
+	blob2, err := ioutil.ReadFile(filepath.Join(dir, datadirPrivateKey))
+	if err != nil {
+		t.Fatalf("failed to read previously persisted node key: %v", err)
+	}
+	if bytes.Compare(blob1, blob2) != 0 {
+		t.Fatalf("persisted node key mismatch: have %x, want %x", blob2, blob1)
+	}
+	// Configure ephemeral node and ensure no key is dumped locally
+	if _, err := New(&Config{DataDir: ""}); err != nil {
+		t.Fatalf("failed to create ephemeral stack: %v", err)
+	}
+	if _, err := os.Stat(filepath.Join(".", datadirPrivateKey)); err == nil {
+		t.Fatalf("ephemeral node key persisted to disk")
+	}
+}