python paramiko 远程下载

实现功能：

利用 paramiko 模块实现

1.远程目录检索

2.远程文件下载

3.远程目录下载（带目录结构）

class SFTPConnection(object):
    def __init__(self, host, username, password, port=22):
        try:
            self.transport = paramiko.Transport(sock=(host, port))
            self.transport.connect(username=username, password=password)
            self.sftp = paramiko.SFTPClient.from_transport(self.transport)
        except Exception, e:
            traceback.print_exc()
            sys.stderr.write("%s
" % e)
            sys.exit(-1)

    def __del__(self):
        if self.transport:
            self.transport.close()

    def traverse_directory(self, base_dir, deep=1):
        """Traverse directory"""
        dir_stru = {}
        base_dir_name = os.path.basename(base_dir)
        dir_list = self.sftp.listdir(base_dir)

        for dir_name in dir_list:
            dir_path = os.path.join(base_dir, dir_name)
            if not self._is_file(dir_path):
                if deep > 1:
                    dir_stru.setdefault(base_dir_name, []).append(self.traverse_directory(base_dir=dir_path,
                                                                                          deep=deep - 1))
                else:
                    dir_stru.setdefault(base_dir_name, []).append(dir_name)
            else:
                dir_stru.setdefault(base_dir_name, []).append(dir_name)

        if not dir_list:
            dir_stru.setdefault(base_dir_name, []).append("")

        return dir_stru

    def _is_file(self, file_path):
        if not self._exist_path(file_path):
            sys.stderr.write("File path is not exist.[%s]
" % file_path)
            return None
        return not stat.S_ISDIR(self.sftp.stat(file_path).st_mode)

    def _exist_path(self, file_path):
        try:
            file_stat = self.sftp.stat(file_path)
            return True
        except IOError, e:
            traceback.print_exc()
            sys.stderr.write("%s
" % e)
            return False

    def file_downloader(self, file_path_src, file_dir_des):
        file_path_des = os.path.join(file_dir_des, os.path.basename(file_path_src))
        if os.path.exists(file_path_des):
            sys.stderr.write("Download File[%s] have exist. Pass it.
" % file_path_des)
            return
        if not self._exist_path(file_path_src) or not self._is_file(file_path_src):
            sys.stderr.write("File[%s] is not exist or is not a file.
" % file_path_src)
            sys.exit(-1)
        if not os.path.exists(file_dir_des):
            os.mkdir(file_dir_des)
        sys.stdout.write("File[%s] size is %s 
" % (file_path_src, pretty_size(self.sftp.stat(file_path_src).st_size)))

        self.sftp.get(file_path_src, file_path_des)
        sys.stdout.write("Download file[%s] to [%s] done.
" % (file_path_src, file_path_des))

    def directory_download(self, dir_path_src, dir_path_des):
        if not self._exist_path(dir_path_src):
            sys.stderr.write("path[%s] is not exist in remote machine.
" % dir_path_src)
            sys.exit(-1)
        if not os.path.exists(dir_path_des):
            os.mkdir(dir_path_des)
        for sub_dir_name in self.sftp.listdir(dir_path_src):
            sub_dir_path = os.path.join(dir_path_src, sub_dir_name)
            if self._is_file(sub_dir_path):
                self.file_downloader(sub_dir_path, dir_path_des)
            else:
                self.directory_download(sub_dir_path, os.path.join(dir_path_des, sub_dir_name))
        sys.stdout.write("Download data from directory[%s] to [%s] done.
" % (dir_path_src, dir_path_des))