Yaml editor first attempt

1 files changed, 236 insertions, 0 deletions

diff --git a/test/units/yedit_test.py b/test/units/yedit_test.py
new file mode 100755
index 000000000..cdd2d2b59
--- /dev/null
+++ b/test/units/yedit_test.py
@@ -0,0 +1,236 @@
+#!/usr/bin/env python2
+'''
+ Unit tests for yedit
+'''
+
+import unittest
+import os
+import yaml
+
+class YeditException(Exception):
+    ''' Exception class for Yedit '''
+    pass
+
+class Yedit(object):
+    ''' Class to modify yaml files '''
+
+    def __init__(self, filename):
+        self.filename = filename
+        self.__yaml_dict = None
+        self.get()
+
+    @property
+    def yaml_dict(self):
+        ''' get property for yaml_dict '''
+        return self.__yaml_dict
+
+    @yaml_dict.setter
+    def yaml_dict(self, value):
+        ''' setter method for yaml_dict '''
+        self.__yaml_dict = value
+
+    @staticmethod
+    def remove_entry(data, keys):
+        ''' remove an item from a dictionary with key notation a.b.c
+            d = {'a': {'b': 'c'}}}
+            keys = a.b
+            item = c
+        '''
+        if "." in keys:
+            key, rest = keys.split(".", 1)
+            if key in data.keys():
+                Yedit.remove_entry(data[key], rest)
+        else:
+            del data[keys]
+
+    @staticmethod
+    def add_entry(data, keys, item):
+        ''' Add an item to a dictionary with key notation a.b.c
+            d = {'a': {'b': 'c'}}}
+            keys = a.b
+            item = c
+        '''
+        if "." in keys:
+            key, rest = keys.split(".", 1)
+            if key not in data:
+                data[key] = {}
+
+            if not isinstance(data, dict):
+                raise YeditException('Invalid add_entry called on data [%s].' % data)
+            else:
+                Yedit.add_entry(data[key], rest, item)
+
+        else:
+            data[keys] = item
+
+
+    @staticmethod
+    def get_entry(data, keys):
+        ''' Get an item from a dictionary with key notation a.b.c
+            d = {'a': {'b': 'c'}}}
+            keys = a.b
+            return c
+        '''
+        if keys and "." in keys:
+            key, rest = keys.split(".", 1)
+            if not isinstance(data[key], dict):
+                raise YeditException('Invalid get_entry called on a [%s] of type [%s].' % (data, type(data)))
+
+            else:
+                return Yedit.get_entry(data[key], rest)
+
+        else:
+            return data.get(keys, None)
+
+
+    def write(self):
+        ''' write to file '''
+        with open(self.filename, 'w') as yfd:
+            yfd.write(yaml.dump(self.yaml_dict, default_flow_style=False))
+
+    def read(self):
+        ''' write to file '''
+        # check if it exists
+        if not self.exists():
+            return None
+
+        contents = None
+        with open(self.filename) as yfd:
+            contents = yfd.read()
+
+        return contents
+
+    def exists(self):
+        ''' return whether file exists '''
+        if os.path.exists(self.filename):
+            return True
+
+        return False
+    def get(self):
+        ''' return yaml file '''
+        contents = self.read()
+
+        if not contents:
+            return None
+
+        # check if it is yaml
+        try:
+            self.yaml_dict = yaml.load(contents)
+        except yaml.YAMLError as _:
+            # Error loading yaml
+            return None
+
+        return self.yaml_dict
+
+    def delete(self, key):
+        ''' put key, value into a yaml file '''
+        try:
+            entry = Yedit.get_entry(self.yaml_dict, key)
+        except KeyError as _:
+            entry = None
+        if not entry:
+            return  (False, self.yaml_dict)
+
+        Yedit.remove_entry(self.yaml_dict, key)
+        self.write()
+        return (True, self.get())
+
+    def put(self, key, value):
+        ''' put key, value into a yaml file '''
+        try:
+            entry = Yedit.get_entry(self.yaml_dict, key)
+        except KeyError as _:
+            entry = None
+
+        if entry == value:
+            return (False, self.yaml_dict)
+
+        Yedit.add_entry(self.yaml_dict, key, value)
+        self.write()
+        return (True, self.get())
+
+    def create(self, key, value):
+        ''' create the file '''
+        if not self.exists():
+            self.yaml_dict = {key: value}
+            self.write()
+            return (True, self.get())
+
+        return (False, self.get())
+
+
+
+# Removing invalid variable names for tests so that I can
+# keep them brief
+# pylint: disable=invalid-name
+class YeditTest(unittest.TestCase):
+    '''
+     Test class for yedit
+    '''
+    data = {'a': 'a',
+            'b': {'c': {'d': ['e', 'f', 'g']}},
+           }
+
+    filename = 'yedit_test.yml'
+
+    def setUp(self):
+        ''' setup method will create a file and set to known configuration '''
+        yed = Yedit(YeditTest.filename)
+        yed.yaml_dict = YeditTest.data
+        yed.write()
+
+    def test_get(self):
+        ''' Testing a get '''
+        yed = Yedit('yedit_test.yml')
+
+        self.assertEqual(yed.yaml_dict, self.data)
+
+    def test_write(self):
+        ''' Testing a simple write '''
+        yed = Yedit('yedit_test.yml')
+        yed.put('key1', 1)
+        yed.write()
+        yed.get()
+        self.assertTrue(yed.yaml_dict.has_key('key1'))
+        self.assertEqual(yed.yaml_dict['key1'], 1)
+
+    def test_write_x_y_z(self):
+        '''Testing a write of multilayer key'''
+        yed = Yedit('yedit_test.yml')
+        yed.put('x.y.z', 'modified')
+        yed.write()
+        self.assertEqual(Yedit.get_entry(yed.get(), 'x.y.z'), 'modified')
+
+    def test_delete_a(self):
+        '''Testing a simple delete '''
+        yed = Yedit('yedit_test.yml')
+        yed.delete('a')
+        yed.write()
+        yed.get()
+        self.assertTrue(not yed.yaml_dict.has_key('a'))
+
+    def test_delete_b_c(self):
+        '''Testing delete of layered key '''
+        yed = Yedit('yedit_test.yml')
+        yed.delete('b.c')
+        yed.write()
+        yed.get()
+        self.assertTrue(yed.yaml_dict.has_key('b'))
+        self.assertFalse(yed.yaml_dict['b'].has_key('c'))
+
+    def test_create(self):
+        '''Testing a create '''
+        os.unlink(YeditTest.filename)
+        yed = Yedit('yedit_test.yml')
+        yed.create('foo', 'bar')
+        yed.write()
+        yed.get()
+        self.assertTrue(yed.yaml_dict.has_key('foo'))
+        self.assertTrue(yed.yaml_dict['foo'], 'bar')
+
+    def tearDown(self):
+        '''TearDown method'''
+        os.unlink(YeditTest.filename)
+
+if __name__ == "__main__":
+    unittest.main()