mirror of https://github.com/m-labs/artiq.git
117 lines
3.8 KiB
Python
117 lines
3.8 KiB
Python
import os
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import sys
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import logging
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import tempfile
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import shutil
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import shlex
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import subprocess
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import hashlib
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__all__ = ["LocalClient", "SSHClient"]
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logger = logging.getLogger(__name__)
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class Client:
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def transfer_file(self, filename, rewriter=None):
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raise NotImplementedError
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def run_command(self, cmd, **kws):
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raise NotImplementedError
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class LocalClient(Client):
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def __init__(self):
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self._tmp = os.path.join(tempfile.gettempdir(), "artiq")
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def transfer_file(self, filename, rewriter=None):
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logger.debug("Transferring {}".format(filename))
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if rewriter is None:
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return filename
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else:
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os.makedirs(self._tmp, exist_ok=True)
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with open(filename, 'rb') as local:
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rewritten = rewriter(local.read())
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tmp_filename = os.path.join(self._tmp, hashlib.sha1(rewritten).hexdigest())
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with open(tmp_filename, 'wb') as tmp:
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tmp.write(rewritten)
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return tmp_filename
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def run_command(self, cmd, **kws):
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logger.debug("Executing {}".format(cmd))
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subprocess.check_call([arg.format(tmp=self._tmp, **kws) for arg in cmd])
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class SSHClient(Client):
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def __init__(self, host):
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self.host = host
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self.ssh = None
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self.sftp = None
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self._tmp = "/tmp/artiq"
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self._cached = []
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def get_ssh(self):
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if self.ssh is None:
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import paramiko
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logging.getLogger("paramiko").setLevel(logging.WARNING)
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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(self.host)
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logger.debug("Connecting to {}".format(self.host))
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return self.ssh
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def get_transport(self):
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return self.get_ssh().get_transport()
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def get_sftp(self):
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if self.sftp is None:
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self.sftp = self.get_ssh().open_sftp()
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try:
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self._cached = self.sftp.listdir(self._tmp)
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except OSError:
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self.sftp.mkdir(self._tmp)
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return self.sftp
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def transfer_file(self, filename, rewriter=lambda x: x):
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sftp = self.get_sftp()
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with open(filename, 'rb') as local:
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rewritten = rewriter(local.read())
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digest = hashlib.sha1(rewritten).hexdigest()
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remote_filename = os.path.join(self._tmp, digest)
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if digest in self._cached:
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logger.debug("Using cached {}".format(filename))
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else:
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logger.debug("Transferring {}".format(filename))
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# Avoid a race condition by writing into a temporary file
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# and atomically replacing
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with sftp.open(remote_filename + ".~", "wb") as remote:
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remote.write(rewritten)
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try:
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sftp.rename(remote_filename + ".~", remote_filename)
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except IOError:
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# Either it already exists (this is OK) or something else
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# happened (this isn't) and we need to re-raise
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sftp.stat(remote_filename)
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return remote_filename
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def spawn_command(self, cmd, get_pty=False, **kws):
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chan = self.get_transport().open_session()
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chan.set_combine_stderr(True)
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if get_pty:
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chan.get_pty()
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cmd = " ".join([shlex.quote(arg.format(tmp=self._tmp, **kws)) for arg in cmd])
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logger.debug("Executing {}".format(cmd))
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chan.exec_command(cmd)
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return chan
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def drain(self, chan):
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while True:
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char = chan.recv(1)
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if char == b"":
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break
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sys.stderr.write(char.decode("utf-8", errors='replace'))
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def run_command(self, cmd, **kws):
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self.drain(self.spawn_command(cmd, **kws))
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