prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  B3 trace_id and span_id not handled correctly
  These fields are not being handled correctly when an invalid value is passed for one or both of them. Fix that.
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `opentelemetry-sdk/src/opentelemetry/sdk/trace/propagation/b3_format.py`
  Content:
  ```
  1 # Copyright The OpenTelemetry Authors
  2 #
  3 # Licensed under the Apache License, Version 2.0 (the "License");
  4 # you may not use this file except in compliance with the License.
  5 # You may obtain a copy of the License at
  6 #
  7 #     http://www.apache.org/licenses/LICENSE-2.0
  8 #
  9 # Unless required by applicable law or agreed to in writing, software
  10 # distributed under the License is distributed on an "AS IS" BASIS,
  11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 # See the License for the specific language governing permissions and
  13 # limitations under the License.
  14 
  15 import typing
  16 
  17 import opentelemetry.trace as trace
  18 from opentelemetry.context import Context
  19 from opentelemetry.trace.propagation.httptextformat import (
  20     Getter,
  21     HTTPTextFormat,
  22     HTTPTextFormatT,
  23     Setter,
  24 )
  25 
  26 
  27 class B3Format(HTTPTextFormat):
  28     """Propagator for the B3 HTTP header format.
  29 
  30     See: https://github.com/openzipkin/b3-propagation
  31     """
  32 
  33     SINGLE_HEADER_KEY = "b3"
  34     TRACE_ID_KEY = "x-b3-traceid"
  35     SPAN_ID_KEY = "x-b3-spanid"
  36     PARENT_SPAN_ID_KEY = "x-b3-parentspanid"
  37     SAMPLED_KEY = "x-b3-sampled"
  38     FLAGS_KEY = "x-b3-flags"
  39     _SAMPLE_PROPAGATE_VALUES = set(["1", "True", "true", "d"])
  40 
  41     def extract(
  42         self,
  43         get_from_carrier: Getter[HTTPTextFormatT],
  44         carrier: HTTPTextFormatT,
  45         context: typing.Optional[Context] = None,
  46     ) -> Context:
  47         trace_id = format_trace_id(trace.INVALID_TRACE_ID)
  48         span_id = format_span_id(trace.INVALID_SPAN_ID)
  49         sampled = "0"
  50         flags = None
  51 
  52         single_header = _extract_first_element(
  53             get_from_carrier(carrier, self.SINGLE_HEADER_KEY)
  54         )
  55         if single_header:
  56             # The b3 spec calls for the sampling state to be
  57             # "deferred", which is unspecified. This concept does not
  58             # translate to SpanContext, so we set it as recorded.
  59             sampled = "1"
  60             fields = single_header.split("-", 4)
  61 
  62             if len(fields) == 1:
  63                 sampled = fields[0]
  64             elif len(fields) == 2:
  65                 trace_id, span_id = fields
  66             elif len(fields) == 3:
  67                 trace_id, span_id, sampled = fields
  68             elif len(fields) == 4:
  69                 trace_id, span_id, sampled, _ = fields
  70             else:
  71                 return trace.set_span_in_context(trace.INVALID_SPAN)
  72         else:
  73             trace_id = (
  74                 _extract_first_element(
  75                     get_from_carrier(carrier, self.TRACE_ID_KEY)
  76                 )
  77                 or trace_id
  78             )
  79             span_id = (
  80                 _extract_first_element(
  81                     get_from_carrier(carrier, self.SPAN_ID_KEY)
  82                 )
  83                 or span_id
  84             )
  85             sampled = (
  86                 _extract_first_element(
  87                     get_from_carrier(carrier, self.SAMPLED_KEY)
  88                 )
  89                 or sampled
  90             )
  91             flags = (
  92                 _extract_first_element(
  93                     get_from_carrier(carrier, self.FLAGS_KEY)
  94                 )
  95                 or flags
  96             )
  97 
  98         options = 0
  99         # The b3 spec provides no defined behavior for both sample and
  100         # flag values set. Since the setting of at least one implies
  101         # the desire for some form of sampling, propagate if either
  102         # header is set to allow.
  103         if sampled in self._SAMPLE_PROPAGATE_VALUES or flags == "1":
  104             options |= trace.TraceFlags.SAMPLED
  105         return trace.set_span_in_context(
  106             trace.DefaultSpan(
  107                 trace.SpanContext(
  108                     # trace an span ids are encoded in hex, so must be converted
  109                     trace_id=int(trace_id, 16),
  110                     span_id=int(span_id, 16),
  111                     is_remote=True,
  112                     trace_flags=trace.TraceFlags(options),
  113                     trace_state=trace.TraceState(),
  114                 )
  115             )
  116         )
  117 
  118     def inject(
  119         self,
  120         set_in_carrier: Setter[HTTPTextFormatT],
  121         carrier: HTTPTextFormatT,
  122         context: typing.Optional[Context] = None,
  123     ) -> None:
  124         span = trace.get_current_span(context=context)
  125 
  126         if span.get_context() == trace.INVALID_SPAN_CONTEXT:
  127             return
  128 
  129         sampled = (trace.TraceFlags.SAMPLED & span.context.trace_flags) != 0
  130         set_in_carrier(
  131             carrier, self.TRACE_ID_KEY, format_trace_id(span.context.trace_id),
  132         )
  133         set_in_carrier(
  134             carrier, self.SPAN_ID_KEY, format_span_id(span.context.span_id)
  135         )
  136         if span.parent is not None:
  137             set_in_carrier(
  138                 carrier,
  139                 self.PARENT_SPAN_ID_KEY,
  140                 format_span_id(span.parent.span_id),
  141             )
  142         set_in_carrier(carrier, self.SAMPLED_KEY, "1" if sampled else "0")
  143 
  144 
  145 def format_trace_id(trace_id: int) -> str:
  146     """Format the trace id according to b3 specification."""
  147     return format(trace_id, "032x")
  148 
  149 
  150 def format_span_id(span_id: int) -> str:
  151     """Format the span id according to b3 specification."""
  152     return format(span_id, "016x")
  153 
  154 
  155 def _extract_first_element(
  156     items: typing.Iterable[HTTPTextFormatT],
  157 ) -> typing.Optional[HTTPTextFormatT]:
  158     if items is None:
  159         return None
  160     return next(iter(items), None)
  161
  ```
  --- END FILES ---
  
  Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.
  
  Here is an example:
  
  ```diff
  diff --git a/examples/server_async.py b/examples/server_async.py
  --- a/examples/server_async.py
  +++ b/examples/server_async.py
  @@ -313,4 +313,4 @@
   
   
   if __name__ == "__main__":
  -    asyncio.run(run_async_server("."), debug=True)
  +    asyncio.run(run_async_server(), debug=True)
  diff --git a/examples/server_sync.py b/examples/server_sync.py
  --- a/examples/server_sync.py
  +++ b/examples/server_sync.py
  @@ -313,5 +313,5 @@
   
   
   if __name__ == "__main__":
  -    server = run_sync_server(".")
  +    server = run_sync_server()
       server.shutdown()
  
  ```
  
golden_diff: diff --git a/opentelemetry-sdk/src/opentelemetry/sdk/trace/propagation/b3_format.py b/opentelemetry-sdk/src/opentelemetry/sdk/trace/propagation/b3_format.py
  --- a/opentelemetry-sdk/src/opentelemetry/sdk/trace/propagation/b3_format.py
  +++ b/opentelemetry-sdk/src/opentelemetry/sdk/trace/propagation/b3_format.py
  @@ -13,9 +13,11 @@
   # limitations under the License.
   
   import typing
  +from re import compile as re_compile
   
   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.httptextformat import (
       Getter,
       HTTPTextFormat,
  @@ -37,6 +39,8 @@
       SAMPLED_KEY = "x-b3-sampled"
       FLAGS_KEY = "x-b3-flags"
       _SAMPLE_PROPAGATE_VALUES = set(["1", "True", "true", "d"])
  +    _trace_id_regex = re_compile(r"[\da-fA-F]{16}|[\da-fA-F]{32}")
  +    _span_id_regex = re_compile(r"[\da-fA-F]{16}")
   
       def extract(
           self,
  @@ -95,6 +99,18 @@
                   or flags
               )
   
  +        if (
  +            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()
  +            sampled = "0"
  +
  +        else:
  +            trace_id = int(trace_id, 16)
  +            span_id = int(span_id, 16)
  +
           options = 0
           # The b3 spec provides no defined behavior for both sample and
           # flag values set. Since the setting of at least one implies
  @@ -102,12 +118,13 @@
           # header is set to allow.
           if sampled in self._SAMPLE_PROPAGATE_VALUES or flags == "1":
               options |= trace.TraceFlags.SAMPLED
  +
           return trace.set_span_in_context(
               trace.DefaultSpan(
                   trace.SpanContext(
                       # trace an span ids are encoded in hex, so must be converted
  -                    trace_id=int(trace_id, 16),
  -                    span_id=int(span_id, 16),
  +                    trace_id=trace_id,
  +                    span_id=span_id,
                       is_remote=True,
                       trace_flags=trace.TraceFlags(options),
                       trace_state=trace.TraceState(),
  
verification_info: {"golden_diff": "diff --git a/opentelemetry-sdk/src/opentelemetry/sdk/trace/propagation/b3_format.py b/opentelemetry-sdk/src/opentelemetry/sdk/trace/propagation/b3_format.py\n--- a/opentelemetry-sdk/src/opentelemetry/sdk/trace/propagation/b3_format.py\n+++ b/opentelemetry-sdk/src/opentelemetry/sdk/trace/propagation/b3_format.py\n@@ -13,9 +13,11 @@\n # limitations under the License.\n \n import typing\n+from re import compile as re_compile\n \n import opentelemetry.trace as trace\n from opentelemetry.context import Context\n+from opentelemetry.sdk.trace import generate_span_id, generate_trace_id\n from opentelemetry.trace.propagation.httptextformat import (\n     Getter,\n     HTTPTextFormat,\n@@ -37,6 +39,8 @@\n     SAMPLED_KEY = \"x-b3-sampled\"\n     FLAGS_KEY = \"x-b3-flags\"\n     _SAMPLE_PROPAGATE_VALUES = set([\"1\", \"True\", \"true\", \"d\"])\n+    _trace_id_regex = re_compile(r\"[\\da-fA-F]{16}|[\\da-fA-F]{32}\")\n+    _span_id_regex = re_compile(r\"[\\da-fA-F]{16}\")\n \n     def extract(\n         self,\n@@ -95,6 +99,18 @@\n                 or flags\n             )\n \n+        if (\n+            self._trace_id_regex.fullmatch(trace_id) is None\n+            or self._span_id_regex.fullmatch(span_id) is None\n+        ):\n+            trace_id = generate_trace_id()\n+            span_id = generate_span_id()\n+            sampled = \"0\"\n+\n+        else:\n+            trace_id = int(trace_id, 16)\n+            span_id = int(span_id, 16)\n+\n         options = 0\n         # The b3 spec provides no defined behavior for both sample and\n         # flag values set. Since the setting of at least one implies\n@@ -102,12 +118,13 @@\n         # header is set to allow.\n         if sampled in self._SAMPLE_PROPAGATE_VALUES or flags == \"1\":\n             options |= trace.TraceFlags.SAMPLED\n+\n         return trace.set_span_in_context(\n             trace.DefaultSpan(\n                 trace.SpanContext(\n                     # trace an span ids are encoded in hex, so must be converted\n-                    trace_id=int(trace_id, 16),\n-                    span_id=int(span_id, 16),\n+                    trace_id=trace_id,\n+                    span_id=span_id,\n                     is_remote=True,\n                     trace_flags=trace.TraceFlags(options),\n                     trace_state=trace.TraceState(),\n", "issue": "B3 trace_id and span_id not handled correctly\nThese fields are not being handled correctly when an invalid value is passed for one or both of them. Fix that.\n", "before_files": [{"content": "# Copyright The OpenTelemetry Authors\n#\n# Licensed under the Apache License, Version 2.0 (the \"License\");\n# you may not use this file except in compliance with the License.\n# You may obtain a copy of the License at\n#\n#     http://www.apache.org/licenses/LICENSE-2.0\n#\n# Unless required by applicable law or agreed to in writing, software\n# distributed under the License is distributed on an \"AS IS\" BASIS,\n# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n# See the License for the specific language governing permissions and\n# limitations under the License.\n\nimport typing\n\nimport opentelemetry.trace as trace\nfrom opentelemetry.context import Context\nfrom opentelemetry.trace.propagation.httptextformat import (\n    Getter,\n    HTTPTextFormat,\n    HTTPTextFormatT,\n    Setter,\n)\n\n\nclass B3Format(HTTPTextFormat):\n    \"\"\"Propagator for the B3 HTTP header format.\n\n    See: https://github.com/openzipkin/b3-propagation\n    \"\"\"\n\n    SINGLE_HEADER_KEY = \"b3\"\n    TRACE_ID_KEY = \"x-b3-traceid\"\n    SPAN_ID_KEY = \"x-b3-spanid\"\n    PARENT_SPAN_ID_KEY = \"x-b3-parentspanid\"\n    SAMPLED_KEY = \"x-b3-sampled\"\n    FLAGS_KEY = \"x-b3-flags\"\n    _SAMPLE_PROPAGATE_VALUES = set([\"1\", \"True\", \"true\", \"d\"])\n\n    def extract(\n        self,\n        get_from_carrier: Getter[HTTPTextFormatT],\n        carrier: HTTPTextFormatT,\n        context: typing.Optional[Context] = None,\n    ) -> Context:\n        trace_id = format_trace_id(trace.INVALID_TRACE_ID)\n        span_id = format_span_id(trace.INVALID_SPAN_ID)\n        sampled = \"0\"\n        flags = None\n\n        single_header = _extract_first_element(\n            get_from_carrier(carrier, self.SINGLE_HEADER_KEY)\n        )\n        if single_header:\n            # The b3 spec calls for the sampling state to be\n            # \"deferred\", which is unspecified. This concept does not\n            # translate to SpanContext, so we set it as recorded.\n            sampled = \"1\"\n            fields = single_header.split(\"-\", 4)\n\n            if len(fields) == 1:\n                sampled = fields[0]\n            elif len(fields) == 2:\n                trace_id, span_id = fields\n            elif len(fields) == 3:\n                trace_id, span_id, sampled = fields\n            elif len(fields) == 4:\n                trace_id, span_id, sampled, _ = fields\n            else:\n                return trace.set_span_in_context(trace.INVALID_SPAN)\n        else:\n            trace_id = (\n                _extract_first_element(\n                    get_from_carrier(carrier, self.TRACE_ID_KEY)\n                )\n                or trace_id\n            )\n            span_id = (\n                _extract_first_element(\n                    get_from_carrier(carrier, self.SPAN_ID_KEY)\n                )\n                or span_id\n            )\n            sampled = (\n                _extract_first_element(\n                    get_from_carrier(carrier, self.SAMPLED_KEY)\n                )\n                or sampled\n            )\n            flags = (\n                _extract_first_element(\n                    get_from_carrier(carrier, self.FLAGS_KEY)\n                )\n                or flags\n            )\n\n        options = 0\n        # The b3 spec provides no defined behavior for both sample and\n        # flag values set. Since the setting of at least one implies\n        # the desire for some form of sampling, propagate if either\n        # header is set to allow.\n        if sampled in self._SAMPLE_PROPAGATE_VALUES or flags == \"1\":\n            options |= trace.TraceFlags.SAMPLED\n        return trace.set_span_in_context(\n            trace.DefaultSpan(\n                trace.SpanContext(\n                    # trace an span ids are encoded in hex, so must be converted\n                    trace_id=int(trace_id, 16),\n                    span_id=int(span_id, 16),\n                    is_remote=True,\n                    trace_flags=trace.TraceFlags(options),\n                    trace_state=trace.TraceState(),\n                )\n            )\n        )\n\n    def inject(\n        self,\n        set_in_carrier: Setter[HTTPTextFormatT],\n        carrier: HTTPTextFormatT,\n        context: typing.Optional[Context] = None,\n    ) -> None:\n        span = trace.get_current_span(context=context)\n\n        if span.get_context() == trace.INVALID_SPAN_CONTEXT:\n            return\n\n        sampled = (trace.TraceFlags.SAMPLED & span.context.trace_flags) != 0\n        set_in_carrier(\n            carrier, self.TRACE_ID_KEY, format_trace_id(span.context.trace_id),\n        )\n        set_in_carrier(\n            carrier, self.SPAN_ID_KEY, format_span_id(span.context.span_id)\n        )\n        if span.parent is not None:\n            set_in_carrier(\n                carrier,\n                self.PARENT_SPAN_ID_KEY,\n                format_span_id(span.parent.span_id),\n            )\n        set_in_carrier(carrier, self.SAMPLED_KEY, \"1\" if sampled else \"0\")\n\n\ndef format_trace_id(trace_id: int) -> str:\n    \"\"\"Format the trace id according to b3 specification.\"\"\"\n    return format(trace_id, \"032x\")\n\n\ndef format_span_id(span_id: int) -> str:\n    \"\"\"Format the span id according to b3 specification.\"\"\"\n    return format(span_id, \"016x\")\n\n\ndef _extract_first_element(\n    items: typing.Iterable[HTTPTextFormatT],\n) -> typing.Optional[HTTPTextFormatT]:\n    if items is None:\n        return None\n    return next(iter(items), None)\n", "path": "opentelemetry-sdk/src/opentelemetry/sdk/trace/propagation/b3_format.py"}], "after_files": [{"content": "# Copyright The OpenTelemetry Authors\n#\n# Licensed under the Apache License, Version 2.0 (the \"License\");\n# you may not use this file except in compliance with the License.\n# You may obtain a copy of the License at\n#\n#     http://www.apache.org/licenses/LICENSE-2.0\n#\n# Unless required by applicable law or agreed to in writing, software\n# distributed under the License is distributed on an \"AS IS\" BASIS,\n# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n# See the License for the specific language governing permissions and\n# limitations under the License.\n\nimport typing\nfrom re import compile as re_compile\n\nimport opentelemetry.trace as trace\nfrom opentelemetry.context import Context\nfrom opentelemetry.sdk.trace import generate_span_id, generate_trace_id\nfrom opentelemetry.trace.propagation.httptextformat import (\n    Getter,\n    HTTPTextFormat,\n    HTTPTextFormatT,\n    Setter,\n)\n\n\nclass B3Format(HTTPTextFormat):\n    \"\"\"Propagator for the B3 HTTP header format.\n\n    See: https://github.com/openzipkin/b3-propagation\n    \"\"\"\n\n    SINGLE_HEADER_KEY = \"b3\"\n    TRACE_ID_KEY = \"x-b3-traceid\"\n    SPAN_ID_KEY = \"x-b3-spanid\"\n    PARENT_SPAN_ID_KEY = \"x-b3-parentspanid\"\n    SAMPLED_KEY = \"x-b3-sampled\"\n    FLAGS_KEY = \"x-b3-flags\"\n    _SAMPLE_PROPAGATE_VALUES = set([\"1\", \"True\", \"true\", \"d\"])\n    _trace_id_regex = re_compile(r\"[\\da-fA-F]{16}|[\\da-fA-F]{32}\")\n    _span_id_regex = re_compile(r\"[\\da-fA-F]{16}\")\n\n    def extract(\n        self,\n        get_from_carrier: Getter[HTTPTextFormatT],\n        carrier: HTTPTextFormatT,\n        context: typing.Optional[Context] = None,\n    ) -> Context:\n        trace_id = format_trace_id(trace.INVALID_TRACE_ID)\n        span_id = format_span_id(trace.INVALID_SPAN_ID)\n        sampled = \"0\"\n        flags = None\n\n        single_header = _extract_first_element(\n            get_from_carrier(carrier, self.SINGLE_HEADER_KEY)\n        )\n        if single_header:\n            # The b3 spec calls for the sampling state to be\n            # \"deferred\", which is unspecified. This concept does not\n            # translate to SpanContext, so we set it as recorded.\n            sampled = \"1\"\n            fields = single_header.split(\"-\", 4)\n\n            if len(fields) == 1:\n                sampled = fields[0]\n            elif len(fields) == 2:\n                trace_id, span_id = fields\n            elif len(fields) == 3:\n                trace_id, span_id, sampled = fields\n            elif len(fields) == 4:\n                trace_id, span_id, sampled, _ = fields\n            else:\n                return trace.set_span_in_context(trace.INVALID_SPAN)\n        else:\n            trace_id = (\n                _extract_first_element(\n                    get_from_carrier(carrier, self.TRACE_ID_KEY)\n                )\n                or trace_id\n            )\n            span_id = (\n                _extract_first_element(\n                    get_from_carrier(carrier, self.SPAN_ID_KEY)\n                )\n                or span_id\n            )\n            sampled = (\n                _extract_first_element(\n                    get_from_carrier(carrier, self.SAMPLED_KEY)\n                )\n                or sampled\n            )\n            flags = (\n                _extract_first_element(\n                    get_from_carrier(carrier, self.FLAGS_KEY)\n                )\n                or flags\n            )\n\n        if (\n            self._trace_id_regex.fullmatch(trace_id) is None\n            or self._span_id_regex.fullmatch(span_id) is None\n        ):\n            trace_id = generate_trace_id()\n            span_id = generate_span_id()\n            sampled = \"0\"\n\n        else:\n            trace_id = int(trace_id, 16)\n            span_id = int(span_id, 16)\n\n        options = 0\n        # The b3 spec provides no defined behavior for both sample and\n        # flag values set. Since the setting of at least one implies\n        # the desire for some form of sampling, propagate if either\n        # header is set to allow.\n        if sampled in self._SAMPLE_PROPAGATE_VALUES or flags == \"1\":\n            options |= trace.TraceFlags.SAMPLED\n\n        return trace.set_span_in_context(\n            trace.DefaultSpan(\n                trace.SpanContext(\n                    # trace an span ids are encoded in hex, so must be converted\n                    trace_id=trace_id,\n                    span_id=span_id,\n                    is_remote=True,\n                    trace_flags=trace.TraceFlags(options),\n                    trace_state=trace.TraceState(),\n                )\n            )\n        )\n\n    def inject(\n        self,\n        set_in_carrier: Setter[HTTPTextFormatT],\n        carrier: HTTPTextFormatT,\n        context: typing.Optional[Context] = None,\n    ) -> None:\n        span = trace.get_current_span(context=context)\n\n        if span.get_context() == trace.INVALID_SPAN_CONTEXT:\n            return\n\n        sampled = (trace.TraceFlags.SAMPLED & span.context.trace_flags) != 0\n        set_in_carrier(\n            carrier, self.TRACE_ID_KEY, format_trace_id(span.context.trace_id),\n        )\n        set_in_carrier(\n            carrier, self.SPAN_ID_KEY, format_span_id(span.context.span_id)\n        )\n        if span.parent is not None:\n            set_in_carrier(\n                carrier,\n                self.PARENT_SPAN_ID_KEY,\n                format_span_id(span.parent.span_id),\n            )\n        set_in_carrier(carrier, self.SAMPLED_KEY, \"1\" if sampled else \"0\")\n\n\ndef format_trace_id(trace_id: int) -> str:\n    \"\"\"Format the trace id according to b3 specification.\"\"\"\n    return format(trace_id, \"032x\")\n\n\ndef format_span_id(span_id: int) -> str:\n    \"\"\"Format the span id according to b3 specification.\"\"\"\n    return format(span_id, \"016x\")\n\n\ndef _extract_first_element(\n    items: typing.Iterable[HTTPTextFormatT],\n) -> typing.Optional[HTTPTextFormatT]:\n    if items is None:\n        return None\n    return next(iter(items), None)\n", "path": "opentelemetry-sdk/src/opentelemetry/sdk/trace/propagation/b3_format.py"}]}