Add metadata information to file peeking

.gitignore

@@ -13,4 +13,4 @@ servicex.yaml
 
 #Testing 
 samples_structure.txt
-
+tmp_test.py

servicex_analysis_utils/file_peeking.py

@@ -35,7 +35,9 @@
 from servicex.dataset_identifier import DataSetIdentifier
 
 
-def run_query(input_filenames):
+def run_query(
+    input_filenames,
+):
     import uproot
     import awkward as ak
     import json
@@ -59,13 +61,24 @@ def is_tree(obj):
     tree_dict = {}
 
     with uproot.open(input_filenames) as file:
+
         for tree_name in file.keys():
             tree_name_clean = tree_name.rstrip(";1")
             tree = file[tree_name]
 
             if not is_tree(tree):
                 continue
 
+            if tree_name_clean == "MetaData":
+                fm_branches = [
+                    b for b in tree.keys() if b.startswith("FileMetaDataAuxDyn.")
+                ]
+                # remove the prefix in keys
+                meta_dict = {
+                    p[19:]: str(tree[p].array(library="ak")[0]) for p in fm_branches
+                }
+                tree_dict["FileMetaData"] = meta_dict
+
             branch_dict = {}
             for branch_name, branch in tree.items():
                 branch_type = str(branch.interpretation)
@@ -174,9 +187,6 @@ def print_structure_from_str(
     import json
 
     output_lines = []
-    output_lines.append(
-        f"\nFile structure of all samples with branch filter '{filter_branch}':"
-    )
 
     for sample_name, path in deliver_dict.items():
         structure_str = open_delivered_file(sample_name, path)
@@ -186,9 +196,25 @@ def print_structure_from_str(
         structure_dict = json.loads(structure_str)
 
         output_lines.append(
-            f"\n---------------------------\n"
+            "\n---------------------------\n"
             f"\U0001f4c1 Sample: {sample_name}\n"
-            f"---------------------------"
+            "---------------------------"
+        )
+
+        # Get the metadata first
+        output_lines.append("\nFile Metadata \u2139\ufe0f :\n")
+        if "FileMetaData" not in structure_dict:
+            output_lines.append("No FileMetaData found in dataset.")
+        else:
+            for key, value in structure_dict.get("FileMetaData", {}).items():
+                output_lines.append(f"── {key}: {value}")
+        output_lines.append("\n---------------------------")
+
+        # drop the File metadata from the trees
+        structure_dict.pop("FileMetaData", {})
+
+        output_lines.append(
+            f"\nFile structure with branch filter \U0001f33f '{filter_branch}':\n"
         )
 
         for tree_name, branches in structure_dict.items():
@@ -259,6 +285,8 @@ def str_to_array(encoded_json_str):
     """
     reconstructed_data = {}
     structure_dict = json.loads(encoded_json_str)
+    # drop the File metadata from the trees
+    structure_dict.pop("FileMetaData", {})
 
     for treename, branch_dict in structure_dict.items():
         branches = {}

tests/data/expected_metadata.txt

@@ -0,0 +1,19 @@
+
+---------------------------
+📁 Sample: test_file
+---------------------------
+
+File Metadata ℹ️ :
+
+── test_100: 100
+── test_abc: abc
+
+---------------------------
+
+File structure with branch filter 🌿 '':
+
+
+🌳 Tree: MetaData
+   ├── Branches:
+   │   ├── FileMetaDataAuxDyn.test_100 ; dtype: AsDtype('>i8')
+   │   ├── FileMetaDataAuxDyn.test_abc ; dtype: AsStrings()

tests/data/expected_structure.txt

@@ -1,10 +1,17 @@
 
-File structure of all samples with branch filter '':
-
 ---------------------------
 📁 Sample: test_file
 ---------------------------
 
+File Metadata ℹ️ :
+
+No FileMetaData found in dataset.
+
+---------------------------
+
+File structure with branch filter 🌿 '':
+
+
 🌳 Tree: background
    ├── Branches:
    │   ├── branch1 ; dtype: AsDtype('>f8')

tests/test_file_peeking_metadata.py

@@ -0,0 +1,88 @@
+# Copyright (c) 2025, IRIS-HEP
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+# * Redistributions of source code must retain the above copyright notice, this
+#   list of conditions and the following disclaimer.
+#
+# * Redistributions in binary form must reproduce the above copyright notice,
+#   this list of conditions and the following disclaimer in the documentation
+#   and/or other materials provided with the distribution.
+#
+# * Neither the name of the copyright holder nor the names of its
+#   contributors may be used to endorse or promote products derived from
+#   this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+import pytest
+import uproot
+import json
+import os
+from servicex_analysis_utils import file_peeking
+from pathlib import Path
+
+
+@pytest.fixture
+def build_test_samples(tmp_path):
+
+    test_path = str(tmp_path / "test_metadata.root")
+    # example data for two branches
+    tree_data = {
+        "FileMetaDataAuxDyn.test_100": [100],
+        "FileMetaDataAuxDyn.test_abc": ["abc"],
+    }
+
+    # Create tmp .root files
+    with uproot.create(test_path) as file:
+        file["MetaData"] = tree_data
+
+    return test_path
+
+
+# Test run_query and print_structure_from_str
+def test_metadata_retrieval(build_test_samples, tmp_path, capsys):
+
+    path = build_test_samples
+    query_output = file_peeking.run_query(path)
+    # Check result
+    expected_result = {
+        "FileMetaData": {"test_100": "100", "test_abc": "abc"},
+        "MetaData": {
+            "FileMetaDataAuxDyn.test_100": "AsDtype('>i8')",
+            "FileMetaDataAuxDyn.test_abc": "AsStrings()",
+        },
+    }
+    encoded_result = json.loads(query_output[0])
+
+    assert encoded_result == expected_result
+
+    # Produce servicex.deliver() like dict
+    # i.e {"Sample Name":"Path"}
+    tree_data = {"branch": query_output}
+    with uproot.create(tmp_path / "encoded.root") as file:
+        file["servicex"] = tree_data
+    assert os.path.exists(
+        tmp_path / "encoded.root"
+    ), f"servicex-like test file not found."
+    deliver_dict = {"test_file": [str(tmp_path / "encoded.root")]}
+
+    ## Test str formating
+    output_str = file_peeking.print_structure_from_str(deliver_dict)
+
+    expected_path = Path("tests/data/expected_metadata.txt")
+    expected = expected_path.read_text(encoding="utf-8")
+
+    assert (
+        expected == output_str
+    ), f"Output does not match expected.\n Output: {output_str}"