pin cbrrr version, add CI testing

.github/workflows/test.yml

@@ -0,0 +1,23 @@
+name: Run tests
+run-name: ${{ github.actor }} is running tests
+on: push
+jobs:
+  Tests:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [ '3.11', '3.12' ]
+    name: Python ${{ matrix.python-version }} tests
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: recursive
+      - uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install atmst python module
+        run: |
+          python3 -m pip install -v .
+      - name: Run the tests
+        run: |
+          python3 -m unittest -v

pyproject.toml

@@ -19,7 +19,7 @@ classifiers = [
 	"Operating System :: OS Independent",
 ]
 dependencies = [
-	"cbrrr@git+https://github.com/DavidBuchanan314/dag-cbrrr",
+	"cbrrr==0.0.1",
 	"more-itertools",
 	"lru-dict",
 ]

src/atmst/blockstore/car_file.py

@@ -67,10 +67,10 @@ def __init__(self, file: BinaryIO, validate_hashes: bool=True) -> None:
 				break # EOF
 			start = file.tell()
 			CID_LENGTH = 36  # XXX: this is a questionable assumption!!!
-			cid = file.read(CID_LENGTH)
-			if cid[:4] != b"\x01\x71\x12\x20": # I think this is enough to verify the assumption
+			cid = CID(file.read(CID_LENGTH))
+			if not cid.is_cidv1_dag_cbor_sha256_32(): # I think this is enough to verify the assumption
 				raise ValueError("unsupported CID type")
-			self.block_offsets[cid] = (start + CID_LENGTH, length - CID_LENGTH)
+			self.block_offsets[bytes(cid)] = (start + CID_LENGTH, length - CID_LENGTH)
 			file.seek(start + length)
 
 	def put_block(self, key: bytes, value: bytes) -> None:
@@ -83,7 +83,7 @@ def get_block(self, key: bytes) -> bytes:
 		if len(value) != length:
 			raise EOFError()
 		if self.validate_hashes:
-			if key[:4] != b"\x01\x71\x12\x20":
+			if key[:4] != CID.CIDV1_DAG_CBOR_SHA256_32_PFX:
 				raise ValueError("unsupported CID type")
 			digest = hashlib.sha256(value).digest()
 			if digest != key[4:]: