Add interface to make trace & span id customizable

Author: NathanielRN

docs/api/trace.ids_generator.rst

@@ -0,0 +1,7 @@
+opentelemetry.trace.ids_generator
+=================================
+
+.. automodule:: opentelemetry.trace.ids_generator
+    :members:
+    :undoc-members:
+    :show-inheritance:

docs/api/trace.rst

@@ -8,6 +8,7 @@ Submodules
 
    trace.status
    trace.span
+   trace.ids_generator
 
 Module contents
 ---------------

opentelemetry-api/CHANGELOG.md

@@ -6,6 +6,8 @@
   ([#1123](https://github.com/open-telemetry/opentelemetry-python/pull/1123))
 - Store `int`s as `int`s in the global Configuration object
   ([#1118](https://github.com/open-telemetry/opentelemetry-python/pull/1118))
+- Allow for Custom Trace and Span IDs Generation - `IdsGenerator` for TracerProvider
+  ([#1153](https://github.com/open-telemetry/opentelemetry-python/pull/1153))
 
 ## Version 0.13b0
 

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

@@ -77,6 +77,7 @@
 from contextlib import contextmanager
 from logging import getLogger
 
+from opentelemetry.trace.ids_generator import IdsGenerator, RandomIdsGenerator
 from opentelemetry.trace.propagation import (
     get_current_span,
     set_span_in_context,
@@ -436,6 +437,7 @@ def get_tracer_provider() -> TracerProvider:
 __all__ = [
     "DEFAULT_TRACE_OPTIONS",
     "DEFAULT_TRACE_STATE",
+    "IdsGenerator",
     "INVALID_SPAN",
     "INVALID_SPAN_CONTEXT",
     "INVALID_SPAN_ID",
@@ -446,6 +448,7 @@ def get_tracer_provider() -> TracerProvider:
     "Link",
     "LinkBase",
     "ParentSpan",
+    "RandomIdsGenerator",
     "Span",
     "SpanContext",
     "SpanKind",

opentelemetry-api/src/opentelemetry/trace/ids_generator.py

@@ -0,0 +1,52 @@
+# Copyright The OpenTelemetry Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import abc
+import random
+
+
+class IdsGenerator(abc.ABC):
+    @abc.abstractmethod
+    def generate_span_id(self) -> int:
+        """Get a new span ID.
+
+        Returns:
+            A 64-bit int for use as a span ID
+        """
+
+    @abc.abstractmethod
+    def generate_trace_id(self) -> int:
+        """Get a new trace ID.
+
+        Implementations should at least make the 64 least significant bits
+        uniformly random. Samplers like the `TraceIdRatioBased` sampler rely on
+        this randomness to make sampling decisions.
+
+        See `the specification on TraceIdRatioBased <https://github.com/open-telemetry/opentelemetry-specification/blob/master/specification/trace/sdk.md#traceidratiobased>`_.
+
+        Returns:
+            A 128-bit int for use as a trace ID
+        """
+
+
+class RandomIdsGenerator(IdsGenerator):
+    """The default IDs generator for TracerProvider which randomly generates all
+    bits when generating IDs.
+    """
+
+    def generate_span_id(self) -> int:
+        return random.getrandbits(64)
+
+    def generate_trace_id(self) -> int:
+        return random.getrandbits(128)

opentelemetry-sdk/CHANGELOG.md

@@ -8,6 +8,8 @@
   ([#1128](https://github.com/open-telemetry/opentelemetry-python/pull/1128))
 - Add support for `OTEL_BSP_MAX_QUEUE_SIZE`, `OTEL_BSP_SCHEDULE_DELAY_MILLIS`, `OTEL_BSP_MAX_EXPORT_BATCH_SIZE` and `OTEL_BSP_EXPORT_TIMEOUT_MILLIS` environment variables
   ([#1105](https://github.com/open-telemetry/opentelemetry-python/pull/1120))
+- Allow for Custom Trace and Span IDs Generation - `IdsGenerator` for TracerProvider
+  ([#1153](https://github.com/open-telemetry/opentelemetry-python/pull/1153))
 
 ## Version 0.13b0
 

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

@@ -663,24 +663,6 @@ def record_exception(self, exception: Exception) -> None:
         )
 
 
-def generate_span_id() -> int:
-    """Get a new random span ID.
-
-    Returns:
-        A random 64-bit int for use as a span ID
-    """
-    return random.getrandbits(64)
-
-
-def generate_trace_id() -> int:
-    """Get a new random trace ID.
-
-    Returns:
-        A random 128-bit int for use as a trace ID
-    """
-    return random.getrandbits(128)
-
-
 class Tracer(trace_api.Tracer):
     """See `opentelemetry.trace.Tracer`.
 
@@ -733,7 +715,7 @@ def start_span(  # pylint: disable=too-many-locals
 
         if parent_context is None or not parent_context.is_valid:
             parent = parent_context = None
-            trace_id = generate_trace_id()
+            trace_id = self.source.ids_generator.generate_trace_id()
             trace_flags = None
             trace_state = None
         else:
@@ -757,7 +739,7 @@ def start_span(  # pylint: disable=too-many-locals
         )
         context = trace_api.SpanContext(
             trace_id,
-            generate_span_id(),
+            self.source.ids_generator.generate_span_id(),
             is_remote=False,
             trace_flags=trace_flags,
             trace_state=trace_state,
@@ -826,10 +808,15 @@ def __init__(
         active_span_processor: Union[
             SynchronousMultiSpanProcessor, ConcurrentMultiSpanProcessor
         ] = None,
+        ids_generator: trace_api.IdsGenerator = None,
     ):
         self._active_span_processor = (
             active_span_processor or SynchronousMultiSpanProcessor()
         )
+        if ids_generator is None:
+            self.ids_generator = trace_api.RandomIdsGenerator()
+        else:
+            self.ids_generator = ids_generator
         self.resource = resource
         self.sampler = sampler
         self._atexit_handler = None

opentelemetry-sdk/src/opentelemetry/sdk/trace/propagation/b3_format.py

@@ -17,7 +17,6 @@
 
 import opentelemetry.trace as trace
 from opentelemetry.context import Context
-from opentelemetry.sdk.trace import generate_span_id, generate_trace_id
 from opentelemetry.trace.propagation.textmap import (
     Getter,
     Setter,
@@ -103,8 +102,9 @@ def extract(
             self._trace_id_regex.fullmatch(trace_id) is None
             or self._span_id_regex.fullmatch(span_id) is None
         ):
-            trace_id = generate_trace_id()
-            span_id = generate_span_id()
+            ids_generator = trace.get_tracer_provider().ids_generator
+            trace_id = ids_generator.generate_trace_id()
+            span_id = ids_generator.generate_span_id()
             sampled = "0"
 
         else: