mirror of
https://github.com/Stone-Red-Code/dvc.git
synced 2026-11-10 07:18:27 +01:00
Mr. Outis
dda8368f20
- SSH number of jobs increased from 4 to 8. - `batch_exists` now opens all the SFTP sessions available to distribute the work between them. Number of sessions is restricted by the `MaxSessions` option configurable by the `sshd_config`. - Fix #2104 With the optimizations mentioned above, we increased the speed by 8x (using the default `MaxSessions` configuration -- 10). Shout-outs to @efiop, @shcheklein, and @dmpetrov for suggesting the optimization techniques.
311 lines
8.6 KiB
Python
311 lines
8.6 KiB
Python
import os
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import posixpath
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import logging
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import stat
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from contextlib import contextmanager
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try:
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import paramiko
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except ImportError:
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paramiko = None
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from dvc.utils import tmp_fname
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from dvc.utils.compat import ignore_file_not_found
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from dvc.progress import progress
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from dvc.exceptions import DvcException
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from dvc.remote.base import RemoteCmdError
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logger = logging.getLogger(__name__)
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def sizeof_fmt(num, suffix="B"):
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""" Convert number of bytes to human-readable string """
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for unit in ["", "K", "M", "G", "T", "P", "E", "Z"]:
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if abs(num) < 1024.0:
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return "%3.1f%s%s" % (num, unit, suffix)
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num /= 1024.0
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return "%.1f%s%s" % (num, "Y", suffix)
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def percent_cb(name, complete, total):
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""" Callback for updating target progress """
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logger.debug(
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"{}: {} transferred out of {}".format(
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name, sizeof_fmt(complete), sizeof_fmt(total)
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)
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)
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progress.update_target(name, complete, total)
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def create_cb(name):
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""" Create callback function for multipart object """
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return lambda cur, tot: percent_cb(name, cur, tot)
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class SSHConnection:
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def __init__(self, *args, **kwargs):
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self.timeout = kwargs.get("timeout", 1800)
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self._ssh = paramiko.SSHClient()
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self._ssh.load_system_host_keys()
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self._ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
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self._ssh.connect(*args, **kwargs)
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self._sftp = None
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self._sftp_alive = False
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def __enter__(self):
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return self
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def __exit__(self, exception_type, exception_value, traceback):
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self.close()
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def _sftp_connect(self):
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if not self._sftp or not self._sftp_alive:
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self._sftp = self._ssh.open_sftp()
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self._sftp_alive = True
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def close(self):
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if self._sftp:
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self._sftp.close()
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self._sftp_alive = False
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self._ssh.close()
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def st_mode(self, path):
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self._sftp_connect()
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with ignore_file_not_found():
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return self._sftp.stat(path).st_mode
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return 0
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def exists(self, path, sftp=None):
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return bool(self.st_mode(path))
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def isdir(self, path):
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return stat.S_ISDIR(self.st_mode(path))
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def isfile(self, path):
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return stat.S_ISREG(self.st_mode(path))
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def islink(self, path):
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return stat.S_ISLNK(self.st_mode(path))
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def makedirs(self, path):
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self._sftp_connect()
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if self.isdir(path):
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return
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if self.isfile(path) or self.islink(path):
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raise DvcException(
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"a file with the same name '{}' already exists".format(path)
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)
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head, tail = posixpath.split(path)
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if head:
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self.makedirs(head)
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if tail:
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self._sftp.mkdir(path)
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def walk(self, directory, topdown=True):
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# NOTE: original os.walk() implementation [1] with default options was
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# used as a template.
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#
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# [1] https://github.com/python/cpython/blob/master/Lib/os.py
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self._sftp_connect()
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try:
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dir_entries = self._sftp.listdir_attr(directory)
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except IOError as exc:
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raise DvcException(
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"couldn't get the '{}' remote directory files list".format(
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directory
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),
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cause=exc,
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)
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dirs = []
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nondirs = []
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for entry in dir_entries:
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name = entry.filename
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if stat.S_ISDIR(entry.st_mode):
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dirs.append(name)
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else:
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nondirs.append(name)
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if topdown:
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yield directory, dirs, nondirs
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for dname in dirs:
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newpath = posixpath.join(directory, dname)
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for entry in self.walk(newpath, topdown=topdown):
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yield entry
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if not topdown:
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yield directory, dirs, nondirs
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def walk_files(self, directory):
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for root, dirs, files in self.walk(directory):
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for fname in files:
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yield posixpath.join(root, fname)
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def _remove_file(self, path):
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with ignore_file_not_found():
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self._sftp.remove(path)
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def _remove_dir(self, path):
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for root, dirs, files in self.walk(path, topdown=False):
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for fname in files:
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path = posixpath.join(root, fname)
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self._remove_file(path)
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for dname in dirs:
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path = posixpath.join(root, dname)
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self._sftp.rmdir(dname)
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with ignore_file_not_found():
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self._sftp.rmdir(path)
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def remove(self, path):
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self._sftp_connect()
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if self.isdir(path):
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self._remove_dir(path)
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else:
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self._remove_file(path)
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def download(self, src, dest, no_progress_bar=False, progress_title=None):
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self._sftp_connect()
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if no_progress_bar:
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self._sftp.get(src, dest)
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else:
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if not progress_title:
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progress_title = os.path.basename(src)
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self._sftp.get(src, dest, callback=create_cb(progress_title))
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progress.finish_target(progress_title)
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def move(self, src, dst):
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self.makedirs(posixpath.dirname(dst))
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self._sftp_connect()
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self._sftp.rename(src, dst)
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def upload(self, src, dest, no_progress_bar=False, progress_title=None):
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self._sftp_connect()
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self.makedirs(posixpath.dirname(dest))
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tmp_file = tmp_fname(dest)
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if no_progress_bar:
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self._sftp.put(src, tmp_file)
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else:
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if not progress_title:
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progress_title = posixpath.basename(dest)
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self._sftp.put(src, tmp_file, callback=create_cb(progress_title))
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progress.finish_target(progress_title)
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self._sftp.rename(tmp_file, dest)
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def execute(self, cmd):
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stdin, stdout, stderr = self._ssh.exec_command(cmd)
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channel = stdout.channel
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stdin.close()
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channel.shutdown_write()
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stdout_chunks = []
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stderr_chunks = []
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while (
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not channel.closed
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or channel.recv_ready()
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or channel.recv_stderr_ready()
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):
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import select
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got_chunk = False
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readq, _, _ = select.select([stdout.channel], [], [], self.timeout)
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for c in readq:
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if c.recv_ready():
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stdout_chunks.append(stdout.channel.recv(len(c.in_buffer)))
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got_chunk = True
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if c.recv_stderr_ready():
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stderr_len = len(c.in_stderr_buffer)
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s = stderr.channel.recv_stderr(stderr_len)
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stderr_chunks.append(s)
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got_chunk = True
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if (
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not got_chunk
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and stdout.channel.exit_status_ready()
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and not stderr.channel.recv_stderr_ready()
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and not stdout.channel.recv_ready()
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):
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stdout.channel.shutdown_read()
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stdout.channel.close()
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break
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stdout.close()
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stderr.close()
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ret = stdout.channel.recv_exit_status()
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if ret != 0:
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err = b"".join(stderr_chunks).decode("utf-8")
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raise RemoteCmdError("ssh", cmd, ret, err)
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return b"".join(stdout_chunks).decode("utf-8")
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def md5(self, path):
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"""
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Use different md5 commands depending on the OS:
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- Darwin's `md5` returns BSD-style checksums by default
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- Linux's `md5sum` needs the `--tag` flag for a similar output
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Example:
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MD5 (foo.txt) = f3d220a856b52aabbf294351e8a24300
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"""
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uname = self.execute("uname").strip()
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command = {
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"Darwin": "md5 {}".format(path),
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"Linux": "md5sum --tag {}".format(path),
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}.get(uname)
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if not command:
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raise DvcException(
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"'{uname}' is not supported as a remote".format(uname=uname)
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)
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md5 = self.execute(command).split()[-1]
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assert len(md5) == 32
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return md5
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def cp(self, src, dest):
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self.makedirs(posixpath.dirname(dest))
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self.execute("cp {} {}".format(src, dest))
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@contextmanager
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def open_max_sftp_channels(self):
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try:
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channels = []
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while True:
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try:
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channels.append(self._ssh.open_sftp())
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except paramiko.ssh_exception.ChannelException:
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if not channels:
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raise
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break
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yield channels
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finally:
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for channel in channels:
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channel.close()
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