mirror of
https://github.com/pgadmin-org/pgadmin4.git
synced 2024-11-27 11:10:19 -06:00
567 lines
19 KiB
Python
567 lines
19 KiB
Python
# -*- coding: utf-8 -*-
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##########################################################################
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#
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# pgAdmin 4 - PostgreSQL Tools
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#
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# Copyright (C) 2013 - 2017, The pgAdmin Development Team
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# This software is released under the PostgreSQL License
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#
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##########################################################################
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"""
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Introduce a function to run the process executor in detached mode.
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"""
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import csv
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import os
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import sys
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from abc import ABCMeta, abstractproperty, abstractmethod
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from datetime import datetime
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from pickle import dumps, loads
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from subprocess import Popen
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from pgadmin.utils import IS_PY2, u, file_quote, fs_encoding
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if IS_PY2:
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from StringIO import StringIO
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else:
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from io import StringIO
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import pytz
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from dateutil import parser
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from flask import current_app
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from flask_babel import gettext as _
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from flask_security import current_user
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import config
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from pgadmin.model import Process, db
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def get_current_time(format='%Y-%m-%d %H:%M:%S.%f %z'):
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"""
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Generate the current time string in the given format.
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"""
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return datetime.utcnow().replace(
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tzinfo=pytz.utc
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).strftime(format)
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class IProcessDesc(object):
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__metaclass__ = ABCMeta
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@abstractproperty
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def message(self):
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pass
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@abstractmethod
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def details(self, cmd, args):
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pass
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class BatchProcess(object):
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def __init__(self, **kwargs):
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self.id = self.desc = self.cmd = self.args = self.log_dir = \
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self.stdout = self.stderr = self.stime = self.etime = \
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self.ecode = None
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if 'id' in kwargs:
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self._retrieve_process(kwargs['id'])
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else:
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self._create_process(kwargs['desc'], kwargs['cmd'], kwargs['args'])
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def _retrieve_process(self, _id):
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p = Process.query.filter_by(pid=_id, user_id=current_user.id).first()
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if p is None:
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raise LookupError(
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_("Could not find a process with the specified ID.")
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)
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# ID
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self.id = _id
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# Description
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self.desc = loads(p.desc)
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# Status Acknowledged time
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self.atime = p.acknowledge
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# Command
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self.cmd = p.command
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# Arguments
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self.args = p.arguments
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# Log Directory
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self.log_dir = p.logdir
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# Standard ouput log file
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self.stdout = os.path.join(p.logdir, 'out')
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# Standard error log file
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self.stderr = os.path.join(p.logdir, 'err')
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# Start time
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self.stime = p.start_time
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# End time
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self.etime = p.end_time
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# Exit code
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self.ecode = p.exit_code
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def _create_process(self, _desc, _cmd, _args):
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ctime = get_current_time(format='%y%m%d%H%M%S%f')
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log_dir = os.path.join(
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config.SESSION_DB_PATH, 'process_logs'
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)
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def random_number(size):
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import random
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import string
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return ''.join(
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random.choice(
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string.ascii_uppercase + string.digits
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) for _ in range(size)
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)
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created = False
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size = 0
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id = ctime
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while not created:
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try:
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id += random_number(size)
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log_dir = os.path.join(log_dir, id)
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size += 1
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if not os.path.exists(log_dir):
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os.makedirs(log_dir, int('700', 8))
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created = True
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except OSError as oe:
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import errno
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if oe.errno != errno.EEXIST:
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raise
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# ID
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self.id = ctime
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# Description
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self.desc = _desc
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# Status Acknowledged time
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self.atime = None
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# Command
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self.cmd = _cmd
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# Log Directory
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self.log_dir = log_dir
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# Standard ouput log file
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self.stdout = os.path.join(log_dir, 'out')
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# Standard error log file
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self.stderr = os.path.join(log_dir, 'err')
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# Start time
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self.stime = None
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# End time
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self.etime = None
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# Exit code
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self.ecode = None
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# Arguments
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self.args = _args
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args_csv_io = StringIO()
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csv_writer = csv.writer(
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args_csv_io, delimiter=str(','), quoting=csv.QUOTE_MINIMAL
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)
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if sys.version_info.major == 2:
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csv_writer.writerow([a.encode('utf-8') if isinstance(a, unicode) else a for a in _args])
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else:
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csv_writer.writerow(_args)
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args_val = args_csv_io.getvalue().strip(str('\r\n'))
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j = Process(
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pid=int(id), command=_cmd,
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arguments=args_val.decode('utf-8', 'replace') if IS_PY2 and hasattr(args_val, 'decode') \
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else args_val,
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logdir=log_dir, desc=dumps(self.desc), user_id=current_user.id
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)
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db.session.add(j)
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db.session.commit()
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def start(self, cb=None):
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def which(program, paths):
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def is_exe(fpath):
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return os.path.exists(fpath) and os.access(fpath, os.X_OK)
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for path in paths:
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if not os.path.isdir(path):
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continue
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exe_file = os.path.join(u(path, fs_encoding), program)
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if is_exe(exe_file):
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return file_quote(exe_file)
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return None
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def convert_environment_variables(env):
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"""
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This function is use to convert environment variable to string
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because environment variable must be string in popen
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:param env: Dict of environment variable
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:return: Encoded environment variable as string
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"""
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encoding = sys.getdefaultencoding()
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if encoding is None or encoding == 'ascii':
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encoding = 'utf-8'
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temp_env = dict()
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for key, value in env.items():
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if not isinstance(key, str):
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key = key.encode(encoding)
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if not isinstance(value, str):
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value = value.encode(encoding)
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temp_env[key] = value
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return temp_env
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if self.stime is not None:
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if self.etime is None:
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raise Exception(_('The process has already been started.'))
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raise Exception(
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_('The process has already finished and cannot be restarted.')
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)
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executor = file_quote(os.path.join(
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os.path.dirname(u(__file__)), u'process_executor.py'
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))
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paths = os.environ['PATH'].split(os.pathsep)
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interpreter = None
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if os.name == 'nt':
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paths.insert(0, os.path.join(u(sys.prefix), u'Scripts'))
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paths.insert(0, u(sys.prefix))
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interpreter = which(u'pythonw.exe', paths)
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if interpreter is None:
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interpreter = which(u'python.exe', paths)
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if interpreter is None and current_app.PGADMIN_RUNTIME:
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# We've faced an issue with Windows 2008 R2 (x86) regarding,
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# not honouring the environment variables set under the Qt
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# (e.g. runtime), and also setting PYTHONHOME same as
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# sys.executable (i.e. pgAdmin4.exe).
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#
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# As we know, we're running it under the runtime, we can assume
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# that 'venv' directory will be available outside of 'bin'
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# directory.
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#
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# We would try out luck to find python executable based on that
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# assumptions.
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bin_path = os.path.dirname(sys.executable)
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venv = os.path.realpath(
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os.path.join(bin_path, u'..\\venv')
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)
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interpreter = which(u'pythonw.exe', [venv])
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if interpreter is None:
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interpreter = which(u'pythonw.exe', [venv])
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if interpreter is not None:
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# Our assumptions are proven right.
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# Let's append the 'bin' directory to the PATH environment
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# variable. And, also set PYTHONHOME environment variable
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# to 'venv' directory.
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os.environ['PATH'] = bin_path + ';' + os.environ['PATH']
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os.environ['PYTHONHOME'] = venv
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else:
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# Let's not use sys.prefix in runtime.
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# 'sys.prefix' is not identified on *nix systems for some unknown
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# reason, while running under the runtime.
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# We're already adding '<installation path>/pgAdmin 4/venv/bin'
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# directory in the PATH environment variable. Hence - it will
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# anyway be the redundant value in paths.
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if not current_app.PGADMIN_RUNTIME:
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paths.insert(0, os.path.join(u(sys.prefix), u'bin'))
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interpreter = which(u'python', paths)
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p = None
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cmd = [
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interpreter if interpreter is not None else 'python',
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executor, self.cmd
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]
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cmd.extend(self.args)
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if os.name == 'nt' and IS_PY2:
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command = []
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for c in cmd:
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command.append(c.encode('utf-8') if isinstance(c, unicode) else str(c))
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current_app.logger.info(
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u"Executing the process executor with the arguments: %s",
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''.join(command)
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)
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cmd = command
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else:
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current_app.logger.info(
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u"Executing the process executor with the arguments: %s", str(cmd)
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)
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# Make a copy of environment, and add new variables to support
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env = os.environ.copy()
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env['PROCID'] = self.id
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env['OUTDIR'] = self.log_dir
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env['PGA_BGP_FOREGROUND'] = "1"
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if cb is not None:
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cb(env)
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if IS_PY2:
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# We need environment variables & values in string
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env = convert_environment_variables(env)
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if os.name == 'nt':
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DETACHED_PROCESS = 0x00000008
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from subprocess import CREATE_NEW_PROCESS_GROUP
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# We need to redirect the standard input, standard output, and
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# standard error to devnull in order to allow it start in detached
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# mode on
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stdout = os.devnull
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stderr = stdout
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stdin = open(os.devnull, "r")
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stdout = open(stdout, "a")
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stderr = open(stderr, "a")
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p = Popen(
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cmd, close_fds=False, env=env, stdout=stdout.fileno(),
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stderr=stderr.fileno(), stdin=stdin.fileno(),
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creationflags=(CREATE_NEW_PROCESS_GROUP | DETACHED_PROCESS)
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)
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else:
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def preexec_function():
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import signal
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# Detaching from the parent process group
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os.setpgrp()
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# Explicitly ignoring signals in the child process
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signal.signal(signal.SIGINT, signal.SIG_IGN)
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p = Popen(
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cmd, close_fds=True, stdout=None, stderr=None, stdin=None,
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preexec_fn=preexec_function, env=env
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)
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self.ecode = p.poll()
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# Execution completed immediately.
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# Process executor cannot update the status, if it was not able to
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# start properly.
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if self.ecode is not None and self.ecode != 0:
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# There is no way to find out the error message from this process
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# as standard output, and standard error were redirected to
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# devnull.
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p = Process.query.filter_by(
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pid=self.id, user_id=current_user.id
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).first()
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p.start_time = p.end_time = get_current_time()
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if not p.exit_code:
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p.exit_code = self.ecode
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db.session.commit()
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def status(self, out=0, err=0):
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import re
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ctime = get_current_time(format='%Y%m%d%H%M%S%f')
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stdout = []
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stderr = []
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out_completed = err_completed = False
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process_output = (out != -1 and err != -1)
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enc = sys.getdefaultencoding()
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def read_log(logfile, log, pos, ctime):
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completed = True
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idx = 0
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c = re.compile(r"(\d+),(.*$)")
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if not os.path.isfile(logfile):
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return 0, False
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with open(logfile, 'rb') as f:
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eofs = os.fstat(f.fileno()).st_size
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f.seek(pos, 0)
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while pos < eofs:
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idx += 1
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line = f.readline()
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line = line.decode(enc, 'replace')
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r = c.split(line)
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if len(r) < 3:
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# ignore this line
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pos = f.tell()
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continue
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if r[1] > ctime:
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completed = False
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break
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log.append([r[1], r[2]])
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pos = f.tell()
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if idx >= 1024:
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completed = False
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break
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if pos == eofs:
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completed = True
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break
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return pos, completed
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if process_output:
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out, out_completed = read_log(self.stdout, stdout, out, ctime)
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err, err_completed = read_log(self.stderr, stderr, err, ctime)
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j = Process.query.filter_by(
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pid=self.id, user_id=current_user.id
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).first()
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execution_time = None
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if j is not None:
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status, updated = BatchProcess.update_process_info(j)
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if updated:
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db.session.commit()
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self.stime = j.start_time
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self.etime = j.end_time
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self.ecode = j.exit_code
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if self.stime is not None:
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stime = parser.parse(self.stime)
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etime = parser.parse(self.etime or get_current_time())
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execution_time = (etime - stime).total_seconds()
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if process_output and self.ecode is not None and (
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len(stdout) + len(stderr) < 1024
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):
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out, out_completed = read_log(self.stdout, stdout, out, ctime)
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err, err_completed = read_log(self.stderr, stderr, err, ctime)
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else:
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out_completed = err_completed = False
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if out == -1 or err == -1:
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return {
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'start_time': self.stime,
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'exit_code': self.ecode,
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'execution_time': execution_time
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}
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return {
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'out': {'pos': out, 'lines': stdout, 'done': out_completed},
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'err': {'pos': err, 'lines': stderr, 'done': err_completed},
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'start_time': self.stime,
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'exit_code': self.ecode,
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'execution_time': execution_time
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}
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@staticmethod
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def update_process_info(p):
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if p.start_time is None or p.end_time is None:
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status = os.path.join(p.logdir, 'status')
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if not os.path.isfile(status):
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return False, False
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with open(status, 'r') as fp:
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import json
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try:
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data = json.load(fp)
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# First - check for the existance of 'start_time'.
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if 'start_time' in data and data['start_time']:
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p.start_time = data['start_time']
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# We can't have 'exit_code' without the 'start_time'
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if 'exit_code' in data and \
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data['exit_code'] is not None:
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p.exit_code = data['exit_code']
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# We can't have 'end_time' without the 'exit_code'.
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if 'end_time' in data and data['end_time']:
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p.end_time = data['end_time']
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return True, True
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except ValueError as e:
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current_app.logger.warning(
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_("Status for the background process '{0}' could not be loaded.").format(
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p.pid
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)
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)
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current_app.logger.exception(e)
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return False, False
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return True, False
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@staticmethod
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def list():
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processes = Process.query.filter_by(user_id=current_user.id)
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changed = False
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res = []
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for p in processes:
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status, updated = BatchProcess.update_process_info(p)
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if not status:
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continue
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if not changed:
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changed = updated
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if p.start_time is None or (
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p.acknowledge is not None and p.end_time is None
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):
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continue
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execution_time = None
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stime = parser.parse(p.start_time)
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etime = parser.parse(p.end_time or get_current_time())
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execution_time = (etime - stime).total_seconds()
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desc = loads(p.desc)
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details = desc
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if isinstance(desc, IProcessDesc):
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args = []
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args_csv = StringIO(
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p.arguments.encode('utf-8') \
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if hasattr(p.arguments, 'decode') else p.arguments
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)
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args_reader = csv.reader(args_csv, delimiter=str(','))
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for arg in args_reader:
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args = args + arg
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details = desc.details(p.command, args)
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desc = desc.message
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res.append({
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'id': p.pid,
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'desc': desc,
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'details': details,
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'stime': stime,
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'etime': p.end_time,
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'exit_code': p.exit_code,
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'acknowledge': p.acknowledge,
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'execution_time': execution_time
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})
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if changed:
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db.session.commit()
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return res
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@staticmethod
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def acknowledge(_pid):
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"""
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Acknowledge from the user, he/she has alredy watched the status.
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Update the acknowledgement status, if the process is still running.
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|
And, delete the process information from the configuration, and the log
|
|
files related to the process, if it has already been completed.
|
|
"""
|
|
p = Process.query.filter_by(
|
|
user_id=current_user.id, pid=_pid
|
|
).first()
|
|
|
|
if p is None:
|
|
raise LookupError(
|
|
_("Could not find a process with the specified ID.")
|
|
)
|
|
|
|
if p.end_time is not None:
|
|
logdir = p.logdir
|
|
db.session.delete(p)
|
|
import shutil
|
|
shutil.rmtree(logdir, True)
|
|
else:
|
|
p.acknowledge = get_current_time()
|
|
|
|
db.session.commit()
|