fix(graphql): resolves errors raised while parsing graphql asts [backport 1.20] (#6990)

Backport e67dcb7 from #6960 to 1.20.

Resolves: #6959


## Checklist

- [x] Change(s) are motivated and described in the PR description.
- [x] Testing strategy is described if automated tests are not included
in the PR.
- [x] Risk is outlined (performance impact, potential for breakage,
maintainability, etc).
- [x] Change is maintainable (easy to change, telemetry, documentation).
- [x] [Library release note
guidelines](https://ddtrace.readthedocs.io/en/stable/releasenotes.html)
are followed. If no release note is required, add label
`changelog/no-changelog`.
- [x] Documentation is included (in-code, generated user docs, [public
corp docs](https://github.com/DataDog/documentation/)).
- [x] Backport labels are set (if
[applicable](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting))

## Reviewer Checklist

- [x] Title is accurate.
- [x] No unnecessary changes are introduced.
- [x] Description motivates each change.
- [x] Avoids breaking
[API](https://ddtrace.readthedocs.io/en/stable/versioning.html#interfaces)
changes unless absolutely necessary.
- [x] Testing strategy adequately addresses listed risk(s).
- [x] Change is maintainable (easy to change, telemetry, documentation).
- [x] Release note makes sense to a user of the library.
- [x] Reviewer has explicitly acknowledged and discussed the performance
implications of this PR as reported in the benchmarks PR comment.
- [x] Backport labels are set in a manner that is consistent with the
[release branch maintenance
policy](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting)
- [x] If this PR touches code that signs or publishes builds or
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- [x] This PR doesn't touch any of that.

Co-authored-by: Munir Abdinur <[email protected]>
Co-authored-by: Emmett Butler <[email protected]>

Author: 3 people

ddtrace/contrib/graphql/patch.py

@@ -283,7 +283,7 @@ def _get_source_str(obj):
         source_str = obj
     elif isinstance(obj, Source):
         source_str = obj.body
-    elif isinstance(obj, Document):
+    elif isinstance(obj, Document) and obj.loc is not None:
         source_str = obj.loc.source.body
     else:
         source_str = ""

releasenotes/notes/graphql-document-fix-ef580e19ff2c4db4.yaml

@@ -0,0 +1,4 @@
+---
+fixes:
+  - |
+    graphql: Resolves ``AttributeError`` raised while parsing graphql Documents where AST Location is None.

tests/contrib/graphql/test_graphql.py

@@ -115,6 +115,14 @@ def test_graphql_v2_with_document(test_schema, test_source_str):
     assert result.data == {"hello": "friend"}
 
 
+@snapshot()
+def test_graphql_with_document_with_no_location(test_schema, test_source_str):
+    source = graphql.language.source.Source(test_source_str, "GraphQL request")
+    document_ast = graphql.language.parser.parse(source, no_location=True)
+    result = graphql.execute(test_schema, document_ast)
+    assert result.data == {"hello": "friend"}
+
+
 @snapshot(token_override="tests.contrib.graphql.test_graphql.test_graphql")
 @pytest.mark.skipif(graphql_version < (3, 0), reason="graphql.graphql_sync is NOT suppoerted in v2.0")
 def test_graphql_sync(test_schema, test_source_str):

tests/snapshots/tests.contrib.graphql.test_graphql.test_graphql_with_document_with_no_location.json

@@ -0,0 +1,55 @@
+[[
+  {
+    "name": "graphql.parse",
+    "service": "graphql",
+    "resource": "graphql.parse",
+    "trace_id": 0,
+    "span_id": 1,
+    "parent_id": 0,
+    "type": "graphql",
+    "meta": {
+      "_dd.base_service": "",
+      "_dd.p.dm": "-0",
+      "component": "graphql",
+      "graphql.source": "query HELLO { hello }",
+      "language": "python",
+      "runtime-id": "630b203d91914ec1bf98fe21da63344d"
+    },
+    "metrics": {
+      "_dd.top_level": 1,
+      "_dd.tracer_kr": 1.0,
+      "_sampling_priority_v1": 1,
+      "process_id": 29253
+    },
+    "duration": 284000,
+    "start": 1695228158961101000
+  }],
+[
+  {
+    "name": "graphql.execute",
+    "service": "graphql",
+    "resource": "graphql.execute",
+    "trace_id": 1,
+    "span_id": 1,
+    "parent_id": 0,
+    "type": "graphql",
+    "meta": {
+      "_dd.base_service": "",
+      "_dd.p.dm": "-0",
+      "component": "graphql",
+      "graphql.operation.name": "HELLO",
+      "graphql.operation.type": "query",
+      "graphql.source": "",
+      "language": "python",
+      "runtime-id": "630b203d91914ec1bf98fe21da63344d"
+    },
+    "metrics": {
+      "_dd.measured": 1,
+      "_dd.top_level": 1,
+      "_dd.tracer_kr": 1.0,
+      "_sampling_priority_v1": 1,
+      "process_id": 29253
+    },
+    "duration": 336000,
+    "start": 1695228158977945000
+  }]]