S3 Fuzzer: Added SpecialVariables dict subclass

Helper class to catch sentinal keys and turn them into random values.  This
will be used to generate garbage data when expanding a decision.

Also add unit tests for expand_decision and assemble_decision

s3tests/functional/test_fuzzer.py

@@ -23,7 +23,7 @@ def build_graph():
     graph = {}
     graph['start'] = {
         'set': {},
-        'choices': ['node1']
+        'choices': ['node2']
     }
     graph['leaf'] = {
         'set': {
@@ -38,6 +38,14 @@ def build_graph():
         },
         'choices': ['leaf']
     }
+    graph['node2'] = {
+        'set': {
+            'randkey': 'value-{random 10-15 printable}',
+            'path': '/{bucket_readable}',
+            'indirect_key1': '{key1}'
+        },
+        'choices': ['leaf']
+    }
     graph['bad_node'] = {
         'set': {
             'key1': 'value1'
@@ -62,6 +70,7 @@ def test_descend_leaf_node():
     eq(decision['key2'], 'value2')
     e = assert_raises(KeyError, lambda x: decision[x], 'key3')
 
+
 def test_descend_node():
     graph = build_graph()
     prng = random.Random(1)
@@ -71,8 +80,45 @@ def test_descend_node():
     eq(decision['key2'], 'value2')
     eq(decision['key3'], 'value3')
 
+
 def test_descend_bad_node():
     graph = build_graph()
     prng = random.Random(1)
     assert_raises(KeyError, descend_graph, graph, 'bad_node', prng)
 
+
+def test_SpecialVariables_dict():
+    prng = random.Random(1)
+    testdict = {'foo': 'bar'}
+    tester = SpecialVariables(testdict, prng)
+
+    eq(tester['foo'], 'bar')
+    eq(tester['random 10-15 printable'], '[/pNI$;92@') #FIXME: how should I test pseudorandom content?
+
+def test_assemble_decision():
+    graph = build_graph()
+    prng = random.Random(1)
+    decision = assemble_decision(graph, prng)
+
+    eq(decision['key1'], 'value1')
+    eq(decision['key2'], 'value2')
+    eq(decision['randkey'], 'value-{random 10-15 printable}')
+    eq(decision['indirect_key1'], '{key1}')
+    eq(decision['path'], '/{bucket_readable}')
+    assert_raises(KeyError, lambda x: decision[x], 'key3')
+
+def test_expand_decision():
+    graph = build_graph()
+    prng = random.Random(1)
+
+    decision = assemble_decision(graph, prng)
+    decision.update({'bucket_readable': 'my-readable-bucket'})
+
+    request = expand_decision(decision, prng)
+
+    eq(request['key1'], 'value1')
+    eq(request['indirect_key1'], 'value1')
+    eq(request['path'], '/my-readable-bucket')
+    eq(request['randkey'], 'value-?') #FIXME: again, how to handle the pseudorandom content?
+    assert_raises(KeyError, lambda x: decision[x], 'key3')
+

s3tests/fuzz_headers.py

@@ -22,14 +22,16 @@ def descend_graph(decision_graph, node_name, prng):
         the node's "set" list, pick a choice from the "choice" list, and
         recurse.  Finally, return dictionary of values
     """
+    node = decision_graph[node_name]
+
     try:
-        choice = prng.choice(decision_graph[node_name]['choices'])
+        #TODO: Give weights to each choice
+        choice = prng.choice(node['choices'])
         decision = descend_graph(decision_graph, choice, prng)
     except IndexError:
         decision = {}
 
-    node = decision_graph[node_name]
-
+    #TODO: Add in headers
     for key in node['set']:
         if decision.has_key(key):
             raise KeyError("Node %s tried to set '%s', but that key was already set by a lower node!" %(node_name, key))
@@ -45,6 +47,46 @@ def expand_decision(decision, prng):
     raise NotImplementedError
 
 
+class SpecialVariables(dict):
+    charsets = {
+        'printable': string.printable,
+        'punctuation': string.punctuation,
+        'whitespace': string.whitespace
+    }
+
+    def __init__(self, orig_dict, prng):
+        self.update(orig_dict)
+        self.prng = prng
+
+
+    def __getitem__(self, key):
+        fields = key.split(None, 1)
+        fn = getattr(self, 'special_{name}'.format(name=fields[0]), None)
+        if fn is None:
+            return super(SpecialVariables, self).__getitem__(key)
+
+        if len(fields) == 1:
+            fields.apppend('')
+        return fn(fields[1])
+
+
+    def special_random(self, args):
+        arg_list = args.split()
+        try:
+            size_min, size_max = [int(x) for x in arg_list[0].split('-')]
+        except IndexError:
+            size_min = 0
+            size_max = 1000
+        try:
+            charset = self.charsets[arg_list[1]]
+        except IndexError:
+            charset = self.charsets['printable']
+
+        length = self.prng.randint(size_min, size_max)
+        return ''.join([self.prng.choice(charset) for _ in xrange(length)]) # Won't scale nicely
+
+
+
 def parse_options():
     parser = OptionParser()
     parser.add_option('-O', '--outfile', help='write output to FILE. Defaults to STDOUT', metavar='FILE')