promise/plugin: Implement check_file_state promise plugin

/reviewed-on !59

slapos/promise/plugin/check_file_state.py

+from zope import interface as zope_interface
+from slapos.grid.promise import interface
+from slapos.grid.promise.generic import GenericPromise
+
+
+class RunPromise(GenericPromise):
+
+  zope_interface.implements(interface.IPromise)
+
+  def __init__(self, config):
+    GenericPromise.__init__(self, config)
+    # SR can set custom periodicity
+    self.setPeriodicity(float(self.getConfig('frequency', 2)))
+
+  def sense(self):
+    """
+      Check state of the filename
+
+      state can be empty or not-empty
+    """
+
+    filename = self.getConfig('filename')
+    state = self.getConfig('state')
+    url = self.getConfig('url').strip()
+
+    try:
+      result = open(filename).read()
+    except Exception as e:
+      self.logger.error(
+        "ERROR %r during opening and reading file %r" % (e, filename))
+      return
+
+    if state == 'empty' and result != '':
+      message_list = ['ERROR %r not empty' % (filename,)]
+      if url:
+        message_list.append(', content available at %s' % (url,))
+      self.logger.error(''.join(message_list))
+    elif state == 'not-empty' and result == '':
+      self.logger.error(
+          "ERROR %r empty" % (filename,))
+    else:
+      self.logger.info("OK %r state %r" % (filename, state))
+
+  def anomaly(self):
+    return self._anomaly(result_count=3, failure_amount=3)

slapos/test/promise/plugin/test_check_file_state.py

+##############################################################################
+#
+# Copyright (c) 2019 Vifib SARL and Contributors. All Rights Reserved.
+#
+# WARNING: This program as such is intended to be used by professional
+# programmers who take the whole responsibility of assessing all potential
+# consequences resulting from its eventual inadequacies and bugs
+# End users who are looking for a ready-to-use solution with commercial
+# guarantees and support are strongly adviced to contract a Free Software
+# Service Company
+#
+# This program is Free Software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 3
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+#
+##############################################################################
+
+from slapos.grid.promise import PromiseError
+from slapos.test.promise.plugin import TestPromisePluginMixin
+
+import tempfile
+import os
+import unittest
+import shutil
+
+
+class TestCheckFileState(TestPromisePluginMixin):
+  def setUp(self):
+    TestPromisePluginMixin.setUp(self)
+    self.tempdir = tempfile.mkdtemp()
+    self.promise_name = "check-file-state.py"
+
+    self.base_content = """from slapos.promise.plugin.check_file_state import RunPromise
+
+extra_config_dict = {
+  'filename': %(filename)r,
+  'state': %(state)r,
+  'url': %(url)r,
+}
+"""
+
+  def tearDown(self):
+    TestPromisePluginMixin.tearDown(self)
+    shutil.rmtree(self.tempdir)
+
+  def test_check_file_directory(self):
+    filename = os.path.join(self.tempdir, 'test.file')
+    os.mkdir(filename)
+    content = self.base_content % {
+      'filename': filename,
+      'state': 'not-empty',
+      'url': 'https://www.example.com/',
+    }
+    self.writePromise(self.promise_name, content)
+    self.configureLauncher()
+    with self.assertRaises(PromiseError):
+      self.launcher.run()
+    result = self.getPromiseResult(self.promise_name)
+    self.assertEqual(result['result']['failed'], True)
+    self.assertEqual(
+      result['result']['message'],
+      "ERROR IOError(21, 'Is a directory') "
+      "during opening and reading file %r" % (filename,)
+    )
+
+  def test_check_file_not_exists(self):
+    filename = os.path.join(self.tempdir, 'test.file')
+    content = self.base_content % {
+      'filename': filename,
+      'state': 'not-empty',
+      'url': 'https://www.example.com/',
+    }
+    self.writePromise(self.promise_name, content)
+    self.configureLauncher()
+    with self.assertRaises(PromiseError):
+      self.launcher.run()
+    result = self.getPromiseResult(self.promise_name)
+    self.assertEqual(result['result']['failed'], True)
+    self.assertEqual(
+      result['result']['message'],
+      "ERROR IOError(2, 'No such file or directory') "
+      "during opening and reading file %r" % (filename,)
+    )
+
+  def test_check_file_empty(self):
+    filename = os.path.join(self.tempdir, 'test.file')
+    with open(filename, 'w') as fh:
+      fh.write('')
+    content = self.base_content % {
+      'filename': filename,
+      'state': 'empty',
+      'url': 'https://www.example.com/',
+    }
+    self.writePromise(self.promise_name, content)
+    self.configureLauncher()
+    self.launcher.run()
+    result = self.getPromiseResult(self.promise_name)
+    self.assertEqual(result['result']['failed'], False)
+    self.assertEqual(
+      result['result']['message'],
+      "OK %r state 'empty'" % (filename,)
+    )
+
+  def test_check_file_not_empty_fail(self):
+    filename = os.path.join(self.tempdir, 'test.file')
+    with open(filename, 'w') as fh:
+      fh.write('')
+    content = self.base_content % {
+      'filename': filename,
+      'state': 'not-empty',
+      'url': 'https://www.example.com/',
+    }
+    self.writePromise(self.promise_name, content)
+    self.configureLauncher()
+    with self.assertRaises(PromiseError):
+      self.launcher.run()
+    result = self.getPromiseResult(self.promise_name)
+    self.assertEqual(result['result']['failed'], True)
+    self.assertEqual(
+      result['result']['message'],
+      "ERROR %r empty" % (filename,)
+    )
+
+  def test_check_file_not_empty(self):
+    filename = os.path.join(self.tempdir, 'test.file')
+    with open(filename, 'w') as fh:
+      fh.write('content')
+    content = self.base_content % {
+      'filename': filename,
+      'state': 'not-empty',
+      'url': 'https://www.example.com/',
+    }
+    self.writePromise(self.promise_name, content)
+    self.configureLauncher()
+    self.launcher.run()
+    result = self.getPromiseResult(self.promise_name)
+    self.assertEqual(result['result']['failed'], False)
+    self.assertEqual(
+      result['result']['message'],
+      "OK %r state 'not-empty'" % (filename,)
+    )
+
+  def test_check_file_empty_fail(self):
+    filename = os.path.join(self.tempdir, 'test.file')
+    with open(filename, 'w') as fh:
+      fh.write('content')
+    content = self.base_content % {
+      'filename': filename,
+      'state': 'empty',
+      'url': 'https://www.example.com/',
+    }
+    self.writePromise(self.promise_name, content)
+    self.configureLauncher()
+    with self.assertRaises(PromiseError):
+      self.launcher.run()
+    result = self.getPromiseResult(self.promise_name)
+    self.assertEqual(result['result']['failed'], True)
+    self.assertEqual(
+      result['result']['message'],
+      "ERROR %r not empty, content available at "
+      "https://www.example.com/" % (filename,)
+    )
+
+
+if __name__ == '__main__':
+  unittest.main()