[ENH]: Allow for matching on the full path

This adds a parameter to `Storage.walk`, allowing users to specif
whether the `matches` applies just to the filename or to the full
path, including the filename.

The same keyword is added to the task and task input, to let this be
set in the datasset.yaml.

Recent changes to the data published in the ecmwf container requires a
new feature in pctasks' create-chunks: the ability to match on a full
path rather than just a filename.

Data are being published under both the

    - <date-prefix>/ifs/...
    - <date-prefix>/aifs/...

We list both sets of data, but our stactools package can't handle the
aifs data properly yet. So we want to filter it out.

Previously, `matches` could only target the filename being listed.
We need that to filter to specific products. We want to extend that
match expression to include the prefix, so that we can filter out the
`aifs` data.

pctasks/core/pctasks/core/storage/base.py

@@ -72,6 +72,7 @@ def walk(
         matches: Optional[str] = None,
         walk_limit: Optional[int] = None,
         file_limit: Optional[int] = None,
+        match_full_path: bool = False,
     ) -> Generator[Tuple[str, List[str], List[str]], None, None]:
         """
         Recursively walk storage.
@@ -87,6 +88,9 @@ def walk(
             matches: Optional regex that path must match
             walk_limit: Limit the number of times to yield
             file_limit: Limit the number of files returned
+            match_full_path: bool, default False
+                Whether to match on just the file name segment of the path (the default) or
+                the entire path, including the base path.
 
         Returns:
             Generator of (path, files, folders) tuples. Similar to os.walk. Lists

pctasks/core/pctasks/core/storage/blob.py

@@ -477,6 +477,7 @@ def walk(
         walk_limit: Optional[int] = None,
         file_limit: Optional[int] = None,
         max_concurrency: int = 32,
+        match_full_path: bool = False,
     ) -> Generator[Tuple[str, List[str], List[str]], None, None]:
         # Ensure UTC set
         since_date = map_opt(lambda d: d.replace(tzinfo=timezone.utc), since_date)
@@ -556,9 +557,17 @@ def _get_prefix_content(
 
                 for future in concurrent.futures.as_completed(futures):
                     full_prefix = futures[future]
-                    folders, files = future.result()
+                    folders, unfiltered_files = future.result()
 
-                    files = [file for file in files if path_filter(file)]
+                    files = []
+
+                    for file in unfiltered_files:
+                        if match_full_path:
+                            match_on = "/".join([full_prefix.rstrip("/"), file])
+                        else:
+                            match_on = file
+                        if path_filter(match_on):
+                            files.append(file)
 
                     if file_limit and file_count + len(files) > file_limit:
                         files = files[: file_limit - file_count]

pctasks/core/pctasks/core/storage/local.py

@@ -82,6 +82,7 @@ def walk(
         matches: Optional[str] = None,
         walk_limit: Optional[int] = None,
         file_limit: Optional[int] = None,
+        match_full_path: bool = False,
     ) -> Generator[Tuple[str, List[str], List[str]], None, None]:
         def _get_depth(path: str) -> int:
             relpath = os.path.relpath(path, self.base_dir)
@@ -102,7 +103,10 @@ def _filter_file(root: str, p: str) -> bool:
             if since_date:
                 if since_date > Datetime.fromtimestamp(os.path.getmtime(full_path)):
                     return False
-            return path_filter(p)
+            if match_full_path:
+                return path_filter(full_path)
+            else:
+                return path_filter(p)
 
         for root, folders, files in os.walk(self.base_dir):
 

pctasks/core/tests/storage/test_blob.py

@@ -124,3 +124,19 @@ def test_blob_download_timeout():
 def test_maybe_rewrite_blob_storage_url(url, expected):
     result = maybe_rewrite_blob_storage_url(url)
     assert result == expected
+
+
+def test_walk_match_full_path():
+    with temp_azurite_blob_storage(
+        HERE / ".." / "data-files" / "simple-assets"
+    ) as storage:
+        result: Dict[str, Tuple[List[str], List[str]]] = {}
+        for root, folders, files in storage.walk(
+            matches="a/asset-.*.json", match_full_path=True
+        ):
+            result[root] = (folders, files)
+
+        assert set(result.keys()) == {".", "a", "b"}
+        assert set(result["."][0]) == {"a", "b"}
+        assert set(result["a"][1]) == {"asset-a-1.json", "asset-a-2.json"}
+        assert set(result["b"][1]) == set()

pctasks/core/tests/storage/test_local.py

@@ -41,3 +41,15 @@ def test_fsspec_components():
     storage = LocalStorage(HERE / ".." / "data-files" / "simple-assets")
     assert storage.fsspec_storage_options == {}
     assert storage.fsspec_path("foo/bar.csv") == "file://foo/bar.csv"
+
+
+def test_walk_match_full_path():
+    storage = LocalStorage(HERE / ".." / "data-files" / "simple-assets")
+    subdirs = {
+        root: files
+        for root, _, files in storage.walk(
+            min_depth=1, max_depth=1, matches="a/asset-.*.json", match_full_path=True
+        )
+    }
+    assert subdirs["a"] == ["asset-a-1.json", "asset-a-2.json"]
+    assert subdirs["b"] == []

pctasks/dataset/pctasks/dataset/chunks/task.py

@@ -57,6 +57,7 @@ def create_chunks(
             file_limit=input.options.limit,
             max_depth=input.options.max_depth,
             min_depth=input.options.min_depth,
+            match_full_path=input.options.match_full_path,
         ):
             if input.options.list_folders:
                 gen = folders

pctasks/dataset/pctasks/dataset/models.py

@@ -63,6 +63,9 @@ class ChunkOptions(PCBaseModel):
     matches: Optional[str] = None
     """Only include asset URIs that match this regex."""
 
+    match_full_path: bool = False
+    """Whether to match on just the file name (the default) or the full path."""
+
     limit: Optional[int] = None
     """Limit the number of URIs to process. """