nix(loadtest): refactor genTargets argument

Instead of passing a path to the output target file, just pass the
directory in which to create the file. This allows the script to create
multiple files later.

nix/tools/generate_targets.py

@@ -58,9 +58,10 @@ def main():
         description="Generate Vegeta targets with unique JWTs"
     )
     parser.add_argument(
-        "targets_path",
-        metavar="TARGETS_PATH",
-        help="Path to write the generated targets file",
+        "generated_path",
+        metavar="GENERATED_PATH",
+        help="Path to write the generated files",
+        type=Path,
     )
     parser.add_argument(
         "--private-key",
@@ -79,6 +80,8 @@ def main():
 
     args = parser.parse_args()
 
+    targets_path = args.generated_path / "gen_targets.http"
+
     rsa_private_key: Optional[jwt.algorithms.RSAAlgorithm] = None
 
     nsamples = 500  # per algorithm
@@ -134,10 +137,10 @@ def main():
             lines.extend(target)
 
     try:
-        with open(args.targets_path, "w") as f:
+        with open(targets_path, "w") as f:
             f.write("\n".join(lines))
     except IOError as e:
-        print(f"Error writing to {args.targets_path}: {e}", file=sys.stderr)
+        print(f"Error writing to {targets_path}: {e}", file=sys.stderr)
         sys.exit(1)
 
     print(f"Created {ntargets} targets", end=" ")

nix/tools/loadtest.nix

@@ -70,7 +70,7 @@ let
             ${genKeyMaterials} --jwks="$_arg_testdir"/gen_jwks.json --private-key="$_arg_testdir"/gen_private.json
             export PGRST_JWT_SECRET="@$_arg_testdir/gen_jwks.json"
 
-            ${genTargets} --private-key="$_arg_testdir"/gen_private.json "$_arg_testdir"/gen_targets.http
+            ${genTargets} --private-key="$_arg_testdir"/gen_private.json "$_arg_testdir"
 
             # shellcheck disable=SC2145
             ${withTools.withPg} -f "$_arg_testdir"/fixtures.sql \
@@ -83,7 +83,7 @@ let
             ${genKeyMaterials} --jwks="$_arg_testdir"/gen_jwks.json --private-key="$_arg_testdir"/gen_private.json
             export PGRST_JWT_SECRET="@$_arg_testdir/gen_jwks.json"
 
-            ${genTargets} --private-key="$_arg_testdir"/gen_private.json "$_arg_testdir"/gen_targets.http
+            ${genTargets} --private-key="$_arg_testdir"/gen_private.json "$_arg_testdir"
 
             # shellcheck disable=SC2145
             ${withTools.withPg} -f "$_arg_testdir"/fixtures.sql \
@@ -96,7 +96,7 @@ let
             ${genKeyMaterials} --jwks="$_arg_testdir"/gen_jwks.json --private-key="$_arg_testdir"/gen_private.json
             export PGRST_JWT_SECRET="@$_arg_testdir/gen_jwks.json"
 
-            ${libfaketime}/bin/faketime '2000-01-01 00:00:00' ${genTargets} --worst --private-key="$_arg_testdir"/gen_private.json "$_arg_testdir"/gen_targets.http
+            ${libfaketime}/bin/faketime '2000-01-01 00:00:00' ${genTargets} --worst --private-key="$_arg_testdir"/gen_private.json "$_arg_testdir"
 
             # shellcheck disable=SC2145
             ${withTools.withPg} -f "$_arg_testdir"/fixtures.sql \