added checking of first row crc to find invalid tfrecord files

addressed code review comments. added check in python layer to exclude directories and to raise an error if a pattern does not match any file

fixed clang format

fixed cppcheck

fixed cppcheck (used std::accumulate and std::copy_if). regenerated tfrecord file to contain correct header, it was a dummy header before

fixed cppcheck: added const reference for string parameter for lambdas, fixed clang format: whitespace adjustments

more clang whitespace fixes...

changed print to logger.info

mindspore/ccsrc/dataset/engine/datasetops/source/tf_reader_op.cc

@@ -42,6 +42,7 @@
 #include "dataset/util/status.h"
 #include "dataset/util/task_manager.h"
 #include "dataset/util/wait_post.h"
+#include "utils/system/crc32c.h"
 
 namespace mindspore {
 namespace dataset {
@@ -56,15 +57,58 @@ TFReaderOp::Builder::Builder()
   builder_data_schema_ = std::make_unique<DataSchema>();
 }
 
+bool ValidateFirstRowCrc(const std::string &filename) {
+  std::ifstream reader;
+  reader.open(filename);
+  if (!reader) {
+    return false;
+  }
+
+  // read data
+  int64_t record_length = 0;
+  (void)reader.read(reinterpret_cast<char *>(&record_length), static_cast<std::streamsize>(sizeof(int64_t)));
+
+  // read crc from file
+  uint32_t masked_crc = 0;
+  (void)reader.read(reinterpret_cast<char *>(&masked_crc), static_cast<std::streamsize>(sizeof(uint32_t)));
+
+  // generate crc from data
+  uint32_t generated_crc =
+    system::Crc32c::GetMaskCrc32cValue(reinterpret_cast<char *>(&record_length), sizeof(int64_t));
+
+  return masked_crc == generated_crc;
+}
+
 Status TFReaderOp::Builder::ValidateInputs() const {
   std::string err_msg;
-  err_msg += builder_num_workers_ <= 0 ? "Number of parallel workers is smaller or equal to 0\n" : "";
-  if (!builder_equal_rows_per_shard_) {
-    err_msg += builder_dataset_files_list_.size() < static_cast<uint32_t>(builder_num_devices_)
-                 ? "No enough tf_file files provided\n"
-                 : "";
+
+  if (builder_num_workers_ <= 0) {
+    err_msg += "Number of parallel workers is smaller or equal to 0\n";
+  }
+
+  if (!builder_equal_rows_per_shard_ &&
+      builder_dataset_files_list_.size() < static_cast<uint32_t>(builder_num_devices_)) {
+    err_msg += "Not enough tfrecord files provided\n";
+  }
+
+  if (builder_device_id_ >= builder_num_devices_ || builder_num_devices_ < 1) {
+    err_msg += "Wrong sharding configs\n";
   }
-  err_msg += builder_device_id_ >= builder_num_devices_ || builder_num_devices_ < 1 ? "Wrong sharding configs\n" : "";
+
+  std::vector<std::string> invalid_files(builder_dataset_files_list_.size());
+  auto it = std::copy_if(builder_dataset_files_list_.begin(), builder_dataset_files_list_.end(), invalid_files.begin(),
+                         [](const std::string &filename) { return !ValidateFirstRowCrc(filename); });
+  invalid_files.resize(std::distance(invalid_files.begin(), it));
+
+  if (!invalid_files.empty()) {
+    err_msg += "The following files either cannot be opened, or are not valid tfrecord files:\n";
+
+    std::string accumulated_filenames = std::accumulate(
+      invalid_files.begin(), invalid_files.end(), std::string(""),
+      [](const std::string &accumulated, const std::string &next) { return accumulated + "    " + next + "\n"; });
+    err_msg += accumulated_filenames;
+  }
+
   return err_msg.empty() ? Status::OK() : Status(StatusCode::kUnexpectedError, __LINE__, __FILE__, err_msg);
 }
 
@@ -523,6 +567,7 @@ Status TFReaderOp::LoadFile(const std::string &filename, const int64_t start_off
       RETURN_IF_NOT_OK(LoadExample(&tf_file, &new_tensor_table, rows_read));
       rows_read++;
     }
+
     // ignore crc footer
     (void)reader.ignore(static_cast<std::streamsize>(sizeof(int32_t)));
     rows_total++;

mindspore/dataset/engine/datasets.py

@@ -900,13 +900,22 @@ class SourceDataset(Dataset):
             List, files.
         """
 
-        def flat(lists):
-            return list(np.array(lists).flatten())
-
         if not isinstance(patterns, list):
             patterns = [patterns]
 
-        file_list = flat([glob.glob(file, recursive=True) for file in patterns])
+        file_list = []
+        unmatched_patterns = []
+        for pattern in patterns:
+            matches = [match for match in glob.glob(pattern, recursive=True) if os.path.isfile(match)]
+
+            if matches:
+                file_list.extend(matches)
+            else:
+                unmatched_patterns.append(pattern)
+
+        if unmatched_patterns:
+            raise ValueError("The following patterns did not match any files: ", unmatched_patterns)
+
         if file_list:  # not empty
             return file_list
         raise ValueError("The list of path names matching the patterns is empty.")

tests/ut/cpp/dataset/tfReader_op_test.cc

@@ -697,3 +697,37 @@ TEST_F(MindDataTestTFReaderOp, TestTotalRowsBasic) {
   TFReaderOp::CountTotalRows(&total_rows, filenames, 729, true);
   ASSERT_EQ(total_rows, 60);
 }
+
+TEST_F(MindDataTestTFReaderOp, TestTFReaderInvalidFiles) {
+  // Start with an empty execution tree
+  auto my_tree = std::make_shared<ExecutionTree>();
+
+  std::string valid_file = datasets_root_path_ + "/testTFTestAllTypes/test.data";
+  std::string schema_file = datasets_root_path_ + "/testTFTestAllTypes/datasetSchema.json";
+  std::string invalid_file = datasets_root_path_ + "/testTFTestAllTypes/invalidFile.txt";
+  std::string nonexistent_file = "this/file/doesnt/exist";
+
+  std::shared_ptr<TFReaderOp> my_tfreader_op;
+  TFReaderOp::Builder builder;
+  builder.SetDatasetFilesList({invalid_file, valid_file, schema_file})
+      .SetRowsPerBuffer(16)
+      .SetNumWorkers(16);
+
+  std::unique_ptr<DataSchema> schema = std::make_unique<DataSchema>();
+  schema->LoadSchemaFile(schema_file, {});
+  builder.SetDataSchema(std::move(schema));
+
+  Status rc = builder.Build(&my_tfreader_op);
+  ASSERT_TRUE(!rc.IsOk());
+
+  builder.SetDatasetFilesList({invalid_file, valid_file, schema_file, nonexistent_file})
+      .SetRowsPerBuffer(16)
+      .SetNumWorkers(16);
+
+  schema = std::make_unique<DataSchema>();
+  schema->LoadSchemaFile(schema_file, {});
+  builder.SetDataSchema(std::move(schema));
+
+  rc = builder.Build(&my_tfreader_op);
+  ASSERT_TRUE(!rc.IsOk());
+}

tests/ut/data/dataset/testTFTestAllTypes/invalidFile.txt

+this is just a text file, not a valid tfrecord file.

tests/ut/python/dataset/test_tfreader_op.py

@@ -32,7 +32,7 @@ def test_case_tf_shape():
     ds1 = ds.TFRecordDataset(FILES, schema_file)
     ds1 = ds1.batch(2)
     for data in ds1.create_dict_iterator():
-        print(data)
+        logger.info(data)
     output_shape = ds1.output_shapes()
     assert (len(output_shape[-1]) == 1)
 
@@ -203,6 +203,32 @@ def test_tf_record_schema_columns_list():
         a = row["col_sint32"]
     assert "col_sint32" in str(info.value)
 
+def test_case_invalid_files():
+    valid_file = "../data/dataset/testTFTestAllTypes/test.data"
+    invalid_file = "../data/dataset/testTFTestAllTypes/invalidFile.txt"
+    files = [invalid_file, valid_file, SCHEMA_FILE]
+
+    data = ds.TFRecordDataset(files, SCHEMA_FILE, shuffle=ds.Shuffle.FILES)
+
+    with pytest.raises(RuntimeError) as info:
+        row = data.create_dict_iterator().get_next()
+    assert "cannot be opened" in str(info.value)
+    assert "not valid tfrecord files" in str(info.value)
+    assert valid_file not in str(info.value)
+    assert invalid_file in str(info.value)
+    assert SCHEMA_FILE in str(info.value)
+
+    nonexistent_file = "this/file/does/not/exist"
+    files = [invalid_file, valid_file, SCHEMA_FILE, nonexistent_file]
+
+    with pytest.raises(ValueError) as info:
+        data = ds.TFRecordDataset(files, SCHEMA_FILE, shuffle=ds.Shuffle.FILES)
+    assert "did not match any files" in str(info.value)
+    assert valid_file not in str(info.value)
+    assert invalid_file not in str(info.value)
+    assert SCHEMA_FILE not in str(info.value)
+    assert nonexistent_file in str(info.value)
+
 if __name__ == '__main__':
     test_case_tf_shape()
     test_case_tf_file()
@@ -212,3 +238,4 @@ if __name__ == '__main__':
     test_tf_record_schema()
     test_tf_record_shuffle()
     test_tf_shard_equal_rows()
+    test_case_invalid_files()