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package files |
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import ( |
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"encoding/gob" |
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"fmt" |
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"io/ioutil" |
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"os" |
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"path/filepath" |
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"github.com/rchargel/hdfs-explorer/base" |
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"github.com/rchargel/hdfs-explorer/log" |
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) |
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// FileSystemRepository is used to load/store/find all of the previously configured FileSystems. |
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type FileSystemRepository interface { |
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List() ([]FileSystem, error) |
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FindByName(name string) (*FileSystem, error) |
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Remove(name string) error |
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Store(fileSystem FileSystem) error |
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} |
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type fileSystemRepository struct { |
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path string |
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} |
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func (f *fileSystemRepository) List() ([]FileSystem, error) { |
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return f.load() |
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} |
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func (f *fileSystemRepository) FindByName(name string) (*FileSystem, error) { |
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if values, err := f.load(); err == nil { |
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for _, value := range values { |
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if value.Name == name { |
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return &value, nil |
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} |
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} |
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} else { |
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return nil, err |
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} |
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return nil, fmt.Errorf("Could not find a FileSystem named %v", name) |
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} |
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func (f *fileSystemRepository) Remove(name string) error { |
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if values, err := f.load(); err == nil { |
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saved := make([]FileSystem, 0) |
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for _, value := range values { |
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if value.Name != name { |
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saved = append(saved, value) |
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} |
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} |
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return f.save(saved) |
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} else { |
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return err |
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} |
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} |
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func (f *fileSystemRepository) Store(fileSystem FileSystem) error { |
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log.Info.Printf("Storing New File System %v", fileSystem.Name) |
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if values, err := f.load(); err == nil { |
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saved := make([]FileSystem, 0) |
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added := false |
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for _, value := range values { |
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if value.Name == fileSystem.Name { |
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saved = append(saved, fileSystem) |
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added = true |
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} else { |
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saved = append(saved, value) |
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} |
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} |
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if !added { |
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saved = append(saved, fileSystem) |
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} |
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return f.save(saved) |
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} else { |
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return err |
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} |
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} |
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func (f *fileSystemRepository) load() ([]FileSystem, error) { |
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fileSystems := make([]FileSystem, 0) |
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if file, err := os.Open(f.path); err == nil { |
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defer file.Close() |
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dec := gob.NewDecoder(file) |
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fs := &FileSystem{} |
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for { |
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err := dec.Decode(fs) |
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if err != nil { |
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break |
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} |
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fileSystems = append(fileSystems, *fs) |
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} |
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} else { |
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return nil, err |
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} |
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return fileSystems, nil |
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} |
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func (f *fileSystemRepository) save(fileSystems []FileSystem) error { |
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if tmp, err := ioutil.TempFile("", "filerepo*.tmp"); err == nil { |
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enc := gob.NewEncoder(tmp) |
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for _, value := range fileSystems { |
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err = enc.Encode(value) |
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if err != nil { |
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return err |
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} |
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} |
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tmp.Close() |
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os.Remove(f.path) |
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return os.Rename(tmp.Name(), f.path) |
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} else { |
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return err |
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} |
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} |
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// GetFileSystemRepository loads an instance of the FileSystemRepository interface. |
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// This call will default to reading the data from $HOME/.fsrepo/fs.repo. |
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func GetFileSystemRepository() (FileSystemRepository, error) { |
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repoFile := filepath.Join(base.HomeDir, "fs.repo") |
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return GetFileSystemRepositoryFromPath(repoFile) |
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} |
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// GetFileSystemRepositoryFromPath loads an instance of the FileSystemRepository found at a specified |
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// location. |
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func GetFileSystemRepositoryFromPath(path string) (FileSystemRepository, error) { |
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if file, err := GetOrCreateFile(path); err == nil { |
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file.Close() |
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return &fileSystemRepository{path}, nil |
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} else { |
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return nil, err |
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} |
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} |
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rchargel /
hdfs-explorer
