Small refactor and 'CreateDir' implementation

db/db_impl.cc

@@ -302,7 +302,7 @@ Status DBImpl::Recover(VersionEdit* edit, bool* save_manifest) {
   // committed only when the descriptor is created, and this directory
   // may already exist from a previous failed creation attempt.
   if (path_->IsDirectory()) {
-    path_->CreateDirectories();
+    path_->CreateDirs();
   }
 
   env_->CreateDir(dbname_);

include/leveldb/filesystem.h

@@ -5,6 +5,7 @@
 #include <string>
 
 #include "leveldb/export.h"
+#include "leveldb/status.h"
 
 namespace leveldb {
 
@@ -19,9 +20,9 @@ public:
   static const char kAltDirecttorySeparator = '/';
   static const char kVolumeSeparatorChar = ':';
 
-  Path() : isDir_{false}, path_("") {}
+  Path() : is_dir_{false}, path_("") {}
   Path(const std::string& path) : path_(path) {
-    isDir_ = !IsEmpty() && IsDirectorySeparator(path_[Size() - 1]);
+    is_dir_ = !IsEmpty() && IsDirectorySeparator(path_[Size() - 1]);
   }
   virtual ~Path() {}
 
@@ -31,17 +32,17 @@ public:
   virtual bool IsAbsolute() const = 0;
   virtual bool IsRelative() const = 0;
 
-  virtual bool CreateDirectories() = 0;
+  virtual Status CreateDirs() = 0;
-  virtual bool CreateDirectory() = 0;
+  virtual Status CreateDir() = 0;
 
   inline size_t Size() const { return path_.size(); }
   inline bool IsEmpty() const { return path_.empty(); }
-  inline bool IsDirectory() const { return isDir_; }
+  inline bool IsDirectory() const { return is_dir_; }
 
   // Utility functions
 
   inline bool HasExtension() { 
-    if (!IsEmpty()) {
+    if (!IsEmpty() && !is_dir_) {
       std::string::reverse_iterator& path_iter = path_.rbegin();
 
       while (path_iter != path_.rend()) {
@@ -60,14 +61,12 @@ public:
   }
 
 protected:
-  bool isDir_;
+  bool is_dir_;
   std::string path_;
 
   virtual void Normalize() = 0;
 };
 
-#ifdef LEVELDB_PLATFORM_WINDOWS
-
 class WindowsFilePath : public Path {
 public:
   explicit WindowsFilePath(const std::string& path) : Path(path) {
@@ -79,8 +78,8 @@ public:
   bool IsAbsolute() const override;
   bool IsRelative() const override;
 
-  bool CreateDirectories() override;
+  Status CreateDirs() override;
-  bool CreateDirectory() override;
+  Status CreateDir() override;
 
 protected:
   void Normalize() override;
@@ -91,16 +90,13 @@ inline bool IsValidDriveChar(const char c) {
   return drive_char >= 'A' && drive_char <= 'Z';
 }
 
-#endif
-
 // Factory
 class PathFactory {
- public:
+public:
-  static Path* Create(const std::string& path);
+  PathFactory() = delete;
+  ~PathFactory() = delete;
 
- private:
+  static Path* Create(const std::string& path);
-  PathFactory() {}
-  ~PathFactory() {}
 };
 
 } // namespace filesystem

util/filesystem.cc

@@ -7,18 +7,10 @@ bool IsDirectorySeparator(const char c) {
   return (c == Path::kDirectorySeparator || c == Path::kAltDirecttorySeparator);
 }
 
-Path* PathFactory::Create(const std::string& path)
-{
-  #ifdef LEVELDB_PLATFORM_WINDOWS
-    return new WindowsFilePath(path);
-  #elif LEVELDB_PLATFORM_POSIX
-    return nullptr;
-  #endif
-    return nullptr;
-}
-
 #ifdef LEVELDB_PLATFORM_WINDOWS
 
+#include <windows.h>
+
 bool WindowsFilePath::IsAbsolute() const {
   return path_.size() >= 3 && IsValidDriveChar(path_[0]) &&
          path_[1] == Path::kVolumeSeparatorChar;
@@ -39,7 +31,6 @@ bool WindowsFilePath::IsRelative() const {
       IsDirectorySeparator(path_[2])) {
     return IsValidDriveChar(path_[0]);
   }
-
   return true;
 };
 
@@ -49,7 +40,7 @@ void WindowsFilePath::Normalize() {
   for (const char c : path_) {
     if (!IsDirectorySeparator(c)) {
       *(out++) = c;
-    } else if (out == path_.begin() || IsDirectorySeparator(*std::prev(out))) {
+    } else if (out == path_.begin() || !IsDirectorySeparator(*std::prev(out))) {
       *(out++) = Path::kDirectorySeparator;
     } else {
       continue;
@@ -59,12 +50,29 @@ void WindowsFilePath::Normalize() {
   path_.erase(out, path_.end());
 }
 
-bool WindowsFilePath::CreateDirectories() { return true; }
+Status WindowsFilePath::CreateDirs() { return Status::OK(); }
 
-bool WindowsFilePath::CreateDirectory() { return true; }
+Status WindowsFilePath::CreateDir() { 
+  if (!CreateDirectoryA(Path::ToCString(), nullptr)) {
+    DWORD error_code = GetLastError();
+    if (error_code == ERROR_FILE_NOT_FOUND || error_code == ERROR_PATH_NOT_FOUND)
+      return Status::NotFound(path_ + "not foud.");
+    return Status::IOError("I/O error occured during " + path_ + " creation");
+  }
+  return Status::OK();
+}
 
 #endif
 
+Path* PathFactory::Create(const std::string& path) {
+#ifdef LEVELDB_PLATFORM_WINDOWS
+  return new WindowsFilePath(path);
+#elif LEVELDB_PLATFORM_POSIX
+  return nullptr;
+#endif
+  return nullptr;
+}
+
 }
 }