io: move common function and add unit tests for it

cli/server/server.go

@@ -5,7 +5,6 @@ import (
 	"fmt"
 	"os"
 	"os/signal"
-	"path"
 
 	"github.com/CityOfZion/neo-go/config"
 	"github.com/CityOfZion/neo-go/pkg/core"
@@ -117,7 +116,7 @@ func handleLoggingParams(ctx *cli.Context, cfg config.ApplicationConfiguration)
 	}
 
 	if logPath := cfg.LogPath; logPath != "" {
-		if err := makeDir(logPath); err != nil {
+		if err := io.MakeDirForFile(logPath, "logger"); err != nil {
 			return err
 		}
 		f, err := os.Create(logPath)
@@ -129,16 +128,6 @@ func handleLoggingParams(ctx *cli.Context, cfg config.ApplicationConfiguration)
 	return nil
 }
 
-func makeDir(filePath string) error {
-	fileName := filePath
-	dir := path.Dir(fileName)
-	err := os.MkdirAll(dir, os.ModePerm)
-	if err != nil {
-		return fmt.Errorf("could not create dir for logger: %v", err)
-	}
-	return nil
-}
-
 func getCountAndSkipFromContext(ctx *cli.Context) (uint32, uint32) {
 	count := uint32(ctx.Uint("count"))
 	skip := uint32(ctx.Uint("skip"))

pkg/core/storage/boltdb_store.go

@@ -4,8 +4,8 @@ import (
 	"bytes"
 	"fmt"
 	"os"
-	"path"
 
+	"github.com/CityOfZion/neo-go/pkg/io"
 	"github.com/etcd-io/bbolt"
 	log "github.com/sirupsen/logrus"
 	"github.com/syndtr/goleveldb/leveldb/util"
@@ -30,10 +30,8 @@ func NewBoltDBStore(cfg BoltDBOptions) (*BoltDBStore, error) {
 	var opts *bbolt.Options       // should be exposed via BoltDBOptions if anything needed
 	fileMode := os.FileMode(0600) // should be exposed via BoltDBOptions if anything needed
 	fileName := cfg.FilePath
-	dir := path.Dir(fileName)
-	err := os.MkdirAll(dir, os.ModePerm)
-	if err != nil {
-		return nil, fmt.Errorf("could not create dir for BoltDB: %v", err)
+	if err := io.MakeDirForFile(fileName, "BoltDB"); err != nil {
+		return nil, err
 	}
 	db, err := bbolt.Open(fileName, fileMode, opts)
 	if err != nil {

pkg/io/fileWriter.go

@@ -0,0 +1,18 @@
+package io
+
+import (
+	"fmt"
+	"os"
+	"path"
+)
+
+// MakeDirForFile creates directory provided in filePath.
+func MakeDirForFile(filePath string, creator string) error {
+	fileName := filePath
+	dir := path.Dir(fileName)
+	err := os.MkdirAll(dir, os.ModePerm)
+	if err != nil {
+		return fmt.Errorf("could not create dir for %s: %v", creator, err)
+	}
+	return nil
+}

pkg/io/fileWriter_test.go

@@ -0,0 +1,39 @@
+package io
+
+import (
+	"io/ioutil"
+	"os"
+	"path"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestMakeDirForFile_HappyPath(t *testing.T) {
+	tempDir, err := ioutil.TempDir("", "test")
+	require.NoError(t, err)
+
+	filePath := tempDir + "/testDir/testFile.test"
+	err = MakeDirForFile(filePath, "test")
+	defer removeDir(t, tempDir)
+	require.NoError(t, err)
+
+	_, errChDir := os.Create(filePath)
+	require.NoError(t, errChDir)
+}
+
+func removeDir(t *testing.T, dirName string) {
+	err := os.RemoveAll(dirName)
+	require.NoError(t, err)
+}
+
+func TestMakeDirForFile_Negative(t *testing.T) {
+	file, err := ioutil.TempFile("", "test")
+	require.NoError(t, err)
+
+	filePath := file.Name() + "/error"
+	dir := path.Dir(filePath)
+	err = MakeDirForFile(filePath, "test")
+	defer removeDir(t, dir)
+	require.Errorf(t, err, "could not create dir for test: mkdir %s : not a directory", filePath)
+}