add uv to nix and direnv, run auto format

Author: podocarp

.envrc

@@ -1,2 +1,3 @@
 use flake
-layout python
+[ -d .venv ] || uv venv
+source_env .venv/bin/activate

drift/instrumentation/e2e_common/base_runner.py

@@ -566,7 +566,7 @@ def _print_comparison(self, baseline: dict[str, dict], sdk: dict[str, dict]):
     def run(self) -> int:
         """Run the full e2e test lifecycle."""
         try:
-            if os.environ.get('BENCHMARKS'):
+            if os.environ.get("BENCHMARKS"):
                 self.setup()
                 self.run_benchmarks()
                 return self.exit_code

drift/instrumentation/e2e_common/test_utils.py

@@ -13,9 +13,9 @@
 BASE_URL = "http://localhost:8000"
 _request_count = 0
 
-BENCHMARK_MODE = os.environ.get('BENCHMARKS', '') != ''
-BENCHMARK_DURATION = int(os.environ.get('BENCHMARK_DURATION', '10'))
-BENCHMARK_WARMUP = int(os.environ.get('BENCHMARK_WARMUP', '3'))
+BENCHMARK_MODE = os.environ.get("BENCHMARKS", "") != ""
+BENCHMARK_DURATION = int(os.environ.get("BENCHMARK_DURATION", "10"))
+BENCHMARK_WARMUP = int(os.environ.get("BENCHMARK_WARMUP", "3"))
 
 # Minimum iterations required for a result to be considered reliable
 _MIN_RELIABLE_ITERATIONS = 30
@@ -88,7 +88,9 @@ def _benchmark_request(method, endpoint, **kwargs):
                 if iterations > 0:
                     ns_per_op = elapsed_ns // iterations
                     ops_per_sec = iterations / (elapsed_ns / 1_000_000_000)
-                    print(f"{name:<40} {iterations:>8} {ns_per_op:>15} ns/op {ops_per_sec:>12.2f} ops/s (partial, {errors} errors)")
+                    print(
+                        f"{name:<40} {iterations:>8} {ns_per_op:>15} ns/op {ops_per_sec:>12.2f} ops/s (partial, {errors} errors)"
+                    )
                 else:
                     print(f"{name:<40} FAILED ({errors} errors, 0 successful iterations)")
                 return last_resp

flake.nix

@@ -39,6 +39,7 @@
         mkShell {
           buildInputs = [
             (python3.withPackages (p: with p; [ ]))
+            uv
           ];
         }
       ) defaultSystems;