feat: add cbor, signing, allocators

Signed-off-by: Daniel Bluhm <dbluhm@pm.me>

pyproject.toml

@@ -6,10 +6,15 @@ authors = [
     {name = "Daniel Bluhm", email = "dbluhm@pm.me"},
 ]
 dependencies = []
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 readme = "README.md"
 license = {text = "Apache-2.0"}
 
+[project.optional-dependencies]
+cbor = [
+    "cbor2>=5.6.4"
+]
+
 [build-system]
 requires = ["pdm-backend"]
 build-backend = "pdm.backend"

tests/__init__.py

@@ -0,0 +1,91 @@
+import time
+import tracemalloc
+import linecache
+import os
+
+
+class Timer:
+    """Timer for timing operations."""
+
+    def __init__(self):
+        self.start = None
+        self.end = None
+
+    def __enter__(self):
+        self.start = time.time()
+        return self
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        self.end = time.time()
+        return False
+
+    @property
+    def time(self) -> float:
+        if self.start is None or self.end is None:
+            raise ValueError("Timer is still running!")
+        return self.end - self.start
+
+
+def display_top_memory(snapshot, key_type="lineno", limit=3):
+    snapshot = snapshot.filter_traces(
+        (
+            tracemalloc.Filter(False, "<frozen importlib._bootstrap>"),
+            tracemalloc.Filter(False, "<unknown>"),
+        )
+    )
+    top_stats = snapshot.statistics(key_type)
+
+    print("Top %s lines" % limit)
+    for index, stat in enumerate(top_stats[:limit], 1):
+        frame = stat.traceback[0]
+        # replace "/path/to/module/file.py" with "module/file.py"
+        filename = os.sep.join(frame.filename.split(os.sep)[-2:])
+        print("#%s: %s:%s: %.1f KiB" % (index, filename, frame.lineno, stat.size / 1024))
+        line = linecache.getline(frame.filename, frame.lineno).strip()
+        if line:
+            print("    %s" % line)
+
+    other = top_stats[limit:]
+    if other:
+        size = sum(stat.size for stat in other)
+        print("%s other: %.1f KiB" % (len(other), size / 1024))
+    total = sum(stat.size for stat in top_stats)
+    print("Total allocated size: %.1f KiB" % (total / 1024))
+
+
+def total_memory_usage(snapshot, key_type="lineno"):
+    """Extract total memory usage in KiB."""
+    snapshot = snapshot.filter_traces(
+        (
+            tracemalloc.Filter(False, "<frozen importlib._bootstrap>"),
+            tracemalloc.Filter(False, "<unknown>"),
+        )
+    )
+    top_stats = snapshot.statistics(key_type)
+    total = sum(stat.size for stat in top_stats)
+    return total / 1024
+
+
+class MemoryTracer:
+    def __init__(self):
+        self.snapshot = None
+
+    def __enter__(self):
+        tracemalloc.start()
+        return self
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        self.snapshot = tracemalloc.take_snapshot()
+        tracemalloc.clear_traces()
+        return False
+
+    def display_top(self):
+        if self.snapshot is None:
+            raise ValueError("Memory tracing still running!")
+        display_top_memory(self.snapshot)
+
+    @property
+    def total(self):
+        if self.snapshot is None:
+            raise ValueError("Memory tracing still running!")
+        return total_memory_usage(self.snapshot)