add check for event attribute values (#678)

This PR addresses issue #352

Validates attribute values and events upon span creation and setting attributes on spans.

Validation logic involves checking if value is one of (int, float, str, bool, list), and if list, each element must be valid and must be all the same primitive, valid type
list values will not contain nested lists
If value is a list, grants immutable property by converting value to a tuple.

ext/opentelemetry-ext-opentracing-shim/tests/test_shim.py

@@ -463,9 +463,6 @@ def test_span_on_error(self):
 
         # Verify exception details have been added to span.
         self.assertEqual(scope.span.unwrap().attributes["error"], True)
-        self.assertEqual(
-            scope.span.unwrap().events[0].attributes["error.kind"], Exception
-        )
 
     def test_inject_http_headers(self):
         """Test `inject()` method for Format.HTTP_HEADERS."""

opentelemetry-sdk/CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## Unreleased
 
+- Validate span attribute types in SDK (#678)
+
 ## 0.7b1
 
 Released 2020-05-12

opentelemetry-sdk/src/opentelemetry/sdk/trace/__init__.py

@@ -17,7 +17,6 @@
 import atexit
 import json
 import logging
-import os
 import random
 import threading
 from collections import OrderedDict
@@ -41,6 +40,7 @@
 MAX_NUM_ATTRIBUTES = 32
 MAX_NUM_EVENTS = 128
 MAX_NUM_LINKS = 32
+VALID_ATTR_VALUE_TYPES = (bool, str, int, float)
 
 
 class SpanProcessor:
@@ -189,6 +189,48 @@ def attributes(self) -> types.Attributes:
         return self._event_formatter()
 
 
+def _is_valid_attribute_value(value: types.AttributeValue) -> bool:
+    """Checks if attribute value is valid.
+
+    An attribute value is valid if it is one of the valid types. If the value
+    is a sequence, it is only valid if all items in the sequence are of valid
+    type, not a sequence, and are of the same type.
+    """
+
+    if isinstance(value, Sequence):
+        if len(value) == 0:
+            return True
+
+        first_element_type = type(value[0])
+
+        if first_element_type not in VALID_ATTR_VALUE_TYPES:
+            logger.warning(
+                "Invalid type %s in attribute value sequence. Expected one of "
+                "%s or a sequence of those types",
+                first_element_type.__name__,
+                [valid_type.__name__ for valid_type in VALID_ATTR_VALUE_TYPES],
+            )
+            return False
+
+        for element in list(value)[1:]:
+            if not isinstance(element, first_element_type):
+                logger.warning(
+                    "Mixed types %s and %s in attribute value sequence",
+                    first_element_type.__name__,
+                    type(element).__name__,
+                )
+                return False
+    elif not isinstance(value, VALID_ATTR_VALUE_TYPES):
+        logger.warning(
+            "Invalid type %s for attribute value. Expected one of %s or a "
+            "sequence of those types",
+            type(value).__name__,
+            [valid_type.__name__ for valid_type in VALID_ATTR_VALUE_TYPES],
+        )
+        return False
+    return True
+
+
 class Span(trace_api.Span):
     """See `opentelemetry.trace.Span`.
 
@@ -245,7 +287,8 @@ def __init__(
         self.status = None
         self._lock = threading.Lock()
 
-        if attributes is None:
+        self._filter_attribute_values(attributes)
+        if not attributes:
             self.attributes = Span._empty_attributes
         else:
             self.attributes = BoundedDict.from_map(
@@ -255,7 +298,10 @@ def __init__(
         if events is None:
             self.events = Span._empty_events
         else:
-            self.events = BoundedList.from_seq(MAX_NUM_EVENTS, events)
+            self.events = BoundedList(MAX_NUM_EVENTS)
+            for event in events:
+                self._filter_attribute_values(event.attributes)
+                self.events.append(event)
 
         if links is None:
             self.links = Span._empty_links
@@ -372,37 +418,24 @@ def set_attribute(self, key: str, value: types.AttributeValue) -> None:
             logger.warning("invalid key (empty or null)")
             return
 
-        if isinstance(value, Sequence):
-            error_message = self._check_attribute_value_sequence(value)
-            if error_message is not None:
-                logger.warning("%s in attribute value sequence", error_message)
-                return
+        if _is_valid_attribute_value(value):
             # Freeze mutable sequences defensively
             if isinstance(value, MutableSequence):
                 value = tuple(value)
-        elif not isinstance(value, (bool, str, int, float)):
-            logger.warning("invalid type for attribute value")
-            return
-
-        self.attributes[key] = value
+            with self._lock:
+                self.attributes[key] = value
 
     @staticmethod
-    def _check_attribute_value_sequence(sequence: Sequence) -> Optional[str]:
-        """
-        Checks if sequence items are valid and are of the same type
-        """
-        if len(sequence) == 0:
-            return None
-
-        first_element_type = type(sequence[0])
-
-        if first_element_type not in (bool, str, int, float):
-            return "invalid type"
-
-        for element in sequence:
-            if not isinstance(element, first_element_type):
-                return "different type"
-        return None
+    def _filter_attribute_values(attributes: types.Attributes):
+        if attributes:
+            for attr_key, attr_value in list(attributes.items()):
+                if _is_valid_attribute_value(attr_value):
+                    if isinstance(attr_value, MutableSequence):
+                        attributes[attr_key] = tuple(attr_value)
+                    else:
+                        attributes[attr_key] = attr_value
+                else:
+                    attributes.pop(attr_key)
 
     def _add_event(self, event: EventBase) -> None:
         with self._lock:
@@ -423,7 +456,8 @@ def add_event(
         attributes: types.Attributes = None,
         timestamp: Optional[int] = None,
     ) -> None:
-        if attributes is None:
+        self._filter_attribute_values(attributes)
+        if not attributes:
             attributes = Span._empty_attributes
         self._add_event(
             Event(
@@ -514,7 +548,6 @@ def __exit__(
             and self._set_status_on_exception
             and exc_val is not None
         ):
-
             self.set_status(
                 Status(
                     canonical_code=StatusCanonicalCode.UNKNOWN,

opentelemetry-sdk/tests/trace/test_trace.py

@@ -487,38 +487,26 @@ def test_invalid_attribute_values(self):
 
             self.assertEqual(len(root.attributes), 0)
 
-    def test_check_sequence_helper(self):
+    def test_check_attribute_helper(self):
         # pylint: disable=protected-access
-        self.assertEqual(
-            trace.Span._check_attribute_value_sequence([1, 2, 3.4, "ss", 4]),
-            "different type",
-        )
-        self.assertEqual(
-            trace.Span._check_attribute_value_sequence([dict(), 1, 2, 3.4, 4]),
-            "invalid type",
-        )
-        self.assertEqual(
-            trace.Span._check_attribute_value_sequence(
-                ["sw", "lf", 3.4, "ss"]
-            ),
-            "different type",
-        )
-        self.assertEqual(
-            trace.Span._check_attribute_value_sequence([1, 2, 3.4, 5]),
-            "different type",
+        self.assertFalse(trace._is_valid_attribute_value([1, 2, 3.4, "ss", 4]))
+        self.assertFalse(
+            trace._is_valid_attribute_value([dict(), 1, 2, 3.4, 4])
         )
-        self.assertIsNone(
-            trace.Span._check_attribute_value_sequence([1, 2, 3, 5])
-        )
-        self.assertIsNone(
-            trace.Span._check_attribute_value_sequence([1.2, 2.3, 3.4, 4.5])
-        )
-        self.assertIsNone(
-            trace.Span._check_attribute_value_sequence([True, False])
-        )
-        self.assertIsNone(
-            trace.Span._check_attribute_value_sequence(["ss", "dw", "fw"])
+        self.assertFalse(
+            trace._is_valid_attribute_value(["sw", "lf", 3.4, "ss"])
         )
+        self.assertFalse(trace._is_valid_attribute_value([1, 2, 3.4, 5]))
+        self.assertTrue(trace._is_valid_attribute_value([1, 2, 3, 5]))
+        self.assertTrue(trace._is_valid_attribute_value([1.2, 2.3, 3.4, 4.5]))
+        self.assertTrue(trace._is_valid_attribute_value([True, False]))
+        self.assertTrue(trace._is_valid_attribute_value(["ss", "dw", "fw"]))
+        self.assertTrue(trace._is_valid_attribute_value([]))
+        self.assertFalse(trace._is_valid_attribute_value(dict()))
+        self.assertTrue(trace._is_valid_attribute_value(True))
+        self.assertTrue(trace._is_valid_attribute_value("hi"))
+        self.assertTrue(trace._is_valid_attribute_value(3.4))
+        self.assertTrue(trace._is_valid_attribute_value(15))
 
     def test_sampling_attributes(self):
         decision_attributes = {
@@ -561,33 +549,67 @@ def test_events(self):
 
             # event name and attributes
             now = time_ns()
-            root.add_event("event1", {"name": "pluto"})
+            root.add_event(
+                "event1", {"name": "pluto", "some_bools": [True, False]}
+            )
 
             # event name, attributes and timestamp
             now = time_ns()
-            root.add_event("event2", {"name": "birthday"}, now)
+            root.add_event("event2", {"name": ["birthday"]}, now)
+
+            mutable_list = ["original_contents"]
+            root.add_event("event3", {"name": mutable_list})
 
             def event_formatter():
                 return {"name": "hello"}
 
             # lazy event
-            root.add_lazy_event("event3", event_formatter, now)
+            root.add_lazy_event("event4", event_formatter, now)
 
-            self.assertEqual(len(root.events), 4)
+            self.assertEqual(len(root.events), 5)
 
             self.assertEqual(root.events[0].name, "event0")
             self.assertEqual(root.events[0].attributes, {})
 
             self.assertEqual(root.events[1].name, "event1")
-            self.assertEqual(root.events[1].attributes, {"name": "pluto"})
+            self.assertEqual(
+                root.events[1].attributes,
+                {"name": "pluto", "some_bools": (True, False)},
+            )
 
             self.assertEqual(root.events[2].name, "event2")
-            self.assertEqual(root.events[2].attributes, {"name": "birthday"})
+            self.assertEqual(
+                root.events[2].attributes, {"name": ("birthday",)}
+            )
             self.assertEqual(root.events[2].timestamp, now)
 
             self.assertEqual(root.events[3].name, "event3")
-            self.assertEqual(root.events[3].attributes, {"name": "hello"})
-            self.assertEqual(root.events[3].timestamp, now)
+            self.assertEqual(
+                root.events[3].attributes, {"name": ("original_contents",)}
+            )
+            mutable_list = ["new_contents"]
+            self.assertEqual(
+                root.events[3].attributes, {"name": ("original_contents",)}
+            )
+
+            self.assertEqual(root.events[4].name, "event4")
+            self.assertEqual(root.events[4].attributes, {"name": "hello"})
+            self.assertEqual(root.events[4].timestamp, now)
+
+    def test_invalid_event_attributes(self):
+        self.assertIsNone(self.tracer.get_current_span())
+
+        with self.tracer.start_as_current_span("root") as root:
+            root.add_event("event0", {"attr1": True, "attr2": ["hi", False]})
+            root.add_event("event0", {"attr1": dict()})
+            root.add_event("event0", {"attr1": [[True]]})
+            root.add_event("event0", {"attr1": [dict()], "attr2": [1, 2]})
+
+            self.assertEqual(len(root.events), 4)
+            self.assertEqual(root.events[0].attributes, {"attr1": True})
+            self.assertEqual(root.events[1].attributes, {})
+            self.assertEqual(root.events[2].attributes, {})
+            self.assertEqual(root.events[3].attributes, {"attr2": (1, 2)})
 
     def test_links(self):
         other_context1 = trace_api.SpanContext(