Force non-binary installation of cbor2

Author: cffls

.gitignore

@@ -5,6 +5,7 @@ docs/build
 dist
 .mypy_cache
 coverage.xml
+.cbor2_version
 
 # IDE
 .idea

Makefile

@@ -23,10 +23,24 @@ export PRINT_HELP_PYSCRIPT
 
 BROWSER := poetry run python -c "$$BROWSER_PYSCRIPT"
 
+ensure-pure-cbor2: ## ensures cbor2 is installed with pure Python implementation
+	@poetry run python -c "from importlib.metadata import version; \
+	print(version('cbor2'))" > .cbor2_version
+	@poetry run python -c "import cbor2, inspect; \
+	print('Checking cbor2 implementation...'); \
+	decoder_path = inspect.getfile(cbor2.CBORDecoder); \
+	using_c_ext = decoder_path.endswith('.so'); \
+	print(f'Implementation path: {decoder_path}'); \
+	print(f'Using C extension: {using_c_ext}'); \
+	exit(1 if using_c_ext else 0)" || \
+	(echo "Reinstalling cbor2 with pure Python implementation..." && \
+	poetry run pip install --no-binary cbor2 "cbor2==$$(cat .cbor2_version)" --force-reinstall && \
+	rm .cbor2_version)
+
 help:
 	@python -c "$$PRINT_HELP_PYSCRIPT" < $(MAKEFILE_LIST)
 
-cov: ## check code coverage
+cov: ensure-pure-cbor2 ## check code coverage
 	poetry run pytest -n 4 --cov pycardano
 
 cov-html: cov ## check code coverage and generate an html report
@@ -54,7 +68,7 @@ clean-test: ## remove test and coverage artifacts
 	rm -fr cov_html/
 	rm -fr .pytest_cache
 
-test: ## runs tests
+test: ensure-pure-cbor2 ## runs tests
 	poetry run pytest -vv -n 4
 
 test-integration: ## runs integration tests
@@ -63,7 +77,7 @@ test-integration: ## runs integration tests
 test-single: ## runs tests with "single" markers
 	poetry run pytest -s -vv -m single
 
-qa: ## runs static analyses
+qa: ensure-pure-cbor2 ## runs static analyses
 	poetry run flake8 pycardano
 	poetry run mypy --install-types --non-interactive pycardano
 	poetry run black --check .
@@ -78,6 +92,6 @@ docs: ## build the documentation
 	poetry run sphinx-build docs/source docs/build/html
 	$(BROWSER) docs/build/html/index.html
 
-release: clean qa test format ## build dist version and release to pypi
+release: clean qa test format ensure-pure-cbor2 ## build dist version and release to pypi
 	poetry build
 	poetry publish

pycardano/serialization.py

@@ -200,19 +200,21 @@ def wrapper(cls, value: Primitive):
 
 CBORBase = TypeVar("CBORBase", bound="CBORSerializable")
 
+def decode_array(self, subtype: int) -> Sequence[Any]:
+    # Major tag 4
+    length = self._decode_length(subtype, allow_indefinite=True)
 
-class IndefiniteDecoder(CBORDecoder):
-    def decode_array(self, subtype: int) -> Sequence[Any]:
-        # Major tag 4
-        length = self._decode_length(subtype, allow_indefinite=True)
-
-        if length is None:
-            return IndefiniteList(
-                cast(Primitive, super().decode_array(subtype=subtype))
-            )
-        else:
-            return super().decode_array(subtype=subtype)
+    if length is None:
+        return IndefiniteList(
+            cast(Primitive, self.decode_array(subtype=subtype))
+        )
+    else:
+        return self.decode_array(subtype=subtype)
 
+try:
+    cbor2._decoder.major_decoders[4] = decode_array
+except Exception as e:
+    logger.warning("Failed to replace major decoder for indefinite array", e)
 
 def default_encoder(
     encoder: CBOREncoder, value: Union[CBORSerializable, IndefiniteList]
@@ -532,8 +534,7 @@ def from_cbor(cls, payload: Union[str, bytes]) -> CBORSerializable:
         if type(payload) is str:
             payload = bytes.fromhex(payload)
 
-        with BytesIO(cast(bytes, payload)) as fp:
-            value = IndefiniteDecoder(fp).decode()
+        value = cbor2.loads(payload)
 
         return cls.from_primitive(value)