Cache and retrieve library_data.json from hed-schemas

hed/schema/hed_cache.py

@@ -6,11 +6,12 @@
 import json
 from hashlib import sha1
 from shutil import copyfile
+import functools
+
 
 import re
 from semantic_version import Version
-import portalocker
-import time
+from hed.schema.hed_cache_lock import CacheException, CacheLock
 from hed.schema.schema_io.schema_util import url_to_file, make_url_request
 from pathlib import Path
 import urllib
@@ -32,15 +33,14 @@
 
 DEFAULT_HED_LIST_VERSIONS_URL = "https://api.github.com/repos/hed-standard/hed-schemas/contents/standard_schema"
 LIBRARY_HED_URL = "https://api.github.com/repos/hed-standard/hed-schemas/contents/library_schemas"
+LIBRARY_DATA_URL = "https://raw.githubusercontent.com/hed-standard/hed-schemas/main/library_data.json"
 DEFAULT_URL_LIST = (DEFAULT_HED_LIST_VERSIONS_URL,)
 DEFAULT_LIBRARY_URL_LIST = (LIBRARY_HED_URL,)
 
 
 DEFAULT_SKIP_FOLDERS = ('deprecated',)
 
 HED_CACHE_DIRECTORY = os.path.join(Path.home(), '.hedtools/hed_cache/')
-TIMESTAMP_FILENAME = "last_update.txt"
-CACHE_TIME_THRESHOLD = 300 * 6
 
 # This is the schemas included in the hedtools package.
 INSTALLED_CACHE_LOCATION = os.path.realpath(os.path.join(os.path.dirname(__file__), 'schema_data/'))
@@ -144,13 +144,11 @@ def cache_local_versions(cache_folder):
     """
     if not cache_folder:
         cache_folder = HED_CACHE_DIRECTORY
-    os.makedirs(cache_folder, exist_ok=True)
 
     try:
-        cache_lock_filename = os.path.join(cache_folder, "cache_lock.lock")
-        with portalocker.Lock(cache_lock_filename, timeout=1):
-            _copy_installed_schemas_to_cache(cache_folder)
-    except portalocker.exceptions.LockException:
+        with CacheLock(cache_folder, write_time=False):
+            _copy_installed_folder_to_cache(cache_folder)
+    except CacheException:
         return -1
 
 
@@ -165,33 +163,25 @@ def cache_xml_versions(hed_base_urls=DEFAULT_URL_LIST, hed_library_urls=DEFAULT_
         cache_folder (str): The folder holding the cache.
 
     Returns:
-        float: Returns -1 if cache failed, a positive number meaning time in seconds since last update
-            if it didn't cache, 0 if it cached successfully this time.
+        float: Returns -1 if cache failed for any reason, including having been cached too recently.
+               Returns 0 if it successfully cached this time.
 
     Notes:
         - The Default skip_folders is 'deprecated'.
         - The HED cache folder defaults to HED_CACHE_DIRECTORY.
         - The directories on GitHub are of the form:
-            https://api.github.com/repos/hed-standard/hed-schemas/contents/standard_schema/hedxml
+            https://api.github.com/repos/hed-standard/hed-schemas/contents/standard_schema
 
     """
     if not cache_folder:
         cache_folder = HED_CACHE_DIRECTORY
 
-    if isinstance(hed_base_urls, str):
-        hed_base_urls = [hed_base_urls]
-    if isinstance(hed_library_urls, str):
-        hed_library_urls = [hed_library_urls]
-    os.makedirs(cache_folder, exist_ok=True)
-    last_timestamp = _read_last_cached_time(cache_folder)
-    current_timestamp = time.time()
-    time_since_update = current_timestamp - last_timestamp
-    if time_since_update < CACHE_TIME_THRESHOLD:
-        return time_since_update
-
     try:
-        cache_lock_filename = os.path.join(cache_folder, "cache_lock.lock")
-        with portalocker.Lock(cache_lock_filename, timeout=1):
+        with CacheLock(cache_folder):
+            if isinstance(hed_base_urls, str):
+                hed_base_urls = [hed_base_urls]
+            if isinstance(hed_library_urls, str):
+                hed_library_urls = [hed_library_urls]
             all_hed_versions = {}
             for hed_base_url in hed_base_urls:
                 new_hed_versions = _get_hed_xml_versions_one_library(hed_base_url)
@@ -205,60 +195,78 @@ def cache_xml_versions(hed_base_urls=DEFAULT_URL_LIST, hed_library_urls=DEFAULT_
                 for version, version_info in hed_versions.items():
                     _cache_hed_version(version, library_name, version_info, cache_folder=cache_folder)
 
-            _write_last_cached_time(current_timestamp, cache_folder)
-    except portalocker.exceptions.LockException or ValueError or URLError:
+    except CacheException or ValueError or URLError:
         return -1
 
     return 0
 
 
-def _copy_installed_schemas_to_cache(cache_folder):
-    """Copies the schemas from the install folder to the cache"""
-    installed_files = os.listdir(INSTALLED_CACHE_LOCATION)
-    for install_name in installed_files:
-        _, basename = os.path.split(install_name)
-        cache_name = os.path.join(cache_folder, basename)
-        install_name = os.path.join(INSTALLED_CACHE_LOCATION, basename)
-        if not os.path.exists(cache_name):
-            shutil.copy(install_name, cache_name)
+@functools.lru_cache(maxsize=50)
+def get_library_data(library_name, cache_folder=None):
+    """Retrieve the library data for the given library.
 
+       Currently, this is just the valid ID range.
 
-def _read_last_cached_time(cache_folder):
-    """ Check the given cache folder to see when it was last updated.
+       Parameters:
+           library_name(str): The schema name.  "" for standard schema.
+           cache_folder(str): The cache folder to use if not using the default.
 
-    Parameters:
-        cache_folder (str): The folder we're caching hed schema in.
+       Returns:
+           library_data(dict): The data for a specific library.
+    """
+    if cache_folder is None:
+        cache_folder = HED_CACHE_DIRECTORY
 
-    Returns:
-        float: The time we last updated the cache.  Zero if no update found.
+    cache_lib_data_folder = os.path.join(cache_folder, "library_data")
 
-    """
-    timestamp_filename = os.path.join(cache_folder, TIMESTAMP_FILENAME)
+    local_library_data_filename = os.path.join(cache_lib_data_folder, "library_data.json")
+    try:
+        with open(local_library_data_filename) as file:
+            library_data = json.load(file)
+        specific_library = library_data[library_name]
+        return specific_library
+    except (OSError, CacheException, ValueError, KeyError):
+        pass
 
     try:
-        with open(timestamp_filename, "r") as f:
-            timestamp = float(f.readline())
-            return timestamp
-    except FileNotFoundError or ValueError or IOError:
-        return 0
+        with CacheLock(cache_lib_data_folder, write_time=False):
+            _copy_installed_folder_to_cache(cache_lib_data_folder, "library_data")
+
+        with open(local_library_data_filename) as file:
+            library_data = json.load(file)
+        specific_library = library_data[library_name]
+        return specific_library
+    except (OSError, CacheException, ValueError, KeyError):
+        pass
 
+    try:
+        with CacheLock(cache_lib_data_folder):
+            # if this fails it'll fail to load in the next step
+            _cache_specific_url(LIBRARY_DATA_URL, local_library_data_filename)
+        with open(local_library_data_filename) as file:
+            library_data = json.load(file)
+        specific_library = library_data[library_name]
+        return specific_library
+    except (OSError, CacheException, ValueError, URLError, KeyError) as e:
+        pass
 
-def _write_last_cached_time(new_time, cache_folder):
-    """ Set the time of last cache update.
+    # This failed to get any data for some reason
+    return {}
 
-    Parameters:
-        new_time (float): The time this was updated.
-        cache_folder (str): The folder used for caching the hed schema.
 
-    :raises ValueError:
-        - something went wrong writing to the file
-    """
-    timestamp_filename = os.path.join(cache_folder, TIMESTAMP_FILENAME)
-    try:
-        with open(timestamp_filename, "w") as f:
-            f.write(str(new_time))
-    except Exception:
-        raise ValueError("Error writing timestamp to hed cache")
+def _copy_installed_folder_to_cache(cache_folder, sub_folder=""):
+    """Copies the schemas from the install folder to the cache"""
+    source_folder = INSTALLED_CACHE_LOCATION
+    if sub_folder:
+        source_folder = os.path.join(INSTALLED_CACHE_LOCATION, sub_folder)
+
+    installed_files = os.listdir(source_folder)
+    for install_name in installed_files:
+        _, basename = os.path.split(install_name)
+        cache_name = os.path.join(cache_folder, basename)
+        install_name = os.path.join(source_folder, basename)
+        if not os.path.isdir(install_name) and not os.path.exists(cache_name):
+            shutil.copy(install_name, cache_name)
 
 
 def _check_if_url(hed_xml_or_url):
@@ -435,13 +443,13 @@ def _cache_hed_version(version, library_name, version_info, cache_folder):
     return _cache_specific_url(download_url, possible_cache_filename)
 
 
-def _cache_specific_url(hed_xml_url, cache_filename):
+def _cache_specific_url(source_url, cache_filename):
     """Copies a specific url to the cache at the given filename"""
     cache_folder = cache_filename.rpartition("/")[0]
     os.makedirs(cache_folder, exist_ok=True)
-    temp_hed_xml_file = url_to_file(hed_xml_url)
-    if temp_hed_xml_file:
-        cache_filename = _safe_move_tmp_to_folder(temp_hed_xml_file, cache_filename)
-        os.remove(temp_hed_xml_file)
+    temp_filename = url_to_file(source_url)
+    if temp_filename:
+        cache_filename = _safe_move_tmp_to_folder(temp_filename, cache_filename)
+        os.remove(temp_filename)
         return cache_filename
     return None

hed/schema/hed_cache_lock.py

@@ -0,0 +1,90 @@
+"""Support utilities for hed_cache locking"""
+import time
+import os
+import portalocker
+
+
+TIMESTAMP_FILENAME = "last_update.txt"
+CACHE_TIME_THRESHOLD = 300 * 6
+
+
+class CacheException(Exception):
+    """Exception for cache locking or threshold errors."""
+    pass
+
+
+class CacheLock:
+    """Class to lock the cache folder to ensure it doesn't get hit by another version at the same time."""
+    def __init__(self, cache_folder, write_time=True, time_threshold=CACHE_TIME_THRESHOLD):
+        """Constructor for hed locking object
+
+        Parameters:
+            cache_folder(str): The folder to create the lock in(implicitly locking that folder)
+            write_time(bool): If true, read and write the cache time.  Additionally, won't operate if too recent.
+                              Generally False for local operations.
+            time_threshold(int): Time before cache is allowed to refresh again.
+
+        """
+        self.cache_folder = cache_folder
+        self.cache_lock_filename = os.path.join(cache_folder, "cache_lock.lock")
+        self.cache_lock = None
+        self.timestamp = None
+        self.write_time = write_time
+        self.time_threshold = time_threshold
+
+    def __enter__(self):
+        os.makedirs(self.cache_folder, exist_ok=True)
+        last_timestamp = _read_last_cached_time(self.cache_folder)
+        self.current_timestamp = time.time()
+        time_since_update = self.current_timestamp - last_timestamp
+        if time_since_update < self.time_threshold:
+            raise CacheException(f"Last updated {time_since_update} seconds ago.  Threshold is {self.time_threshold}")
+
+        try:
+            self.cache_lock = portalocker.Lock(self.cache_lock_filename, timeout=1)
+        except portalocker.exceptions.LockException:
+            raise CacheException(f"Could not lock cache using {self.cache_lock_filename}")
+        pass
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        if self.write_time:
+            _write_last_cached_time(self.current_timestamp, self.cache_folder)
+        self.cache_lock.release()
+
+
+def _read_last_cached_time(cache_folder):
+    """ Check the given cache folder to see when it was last updated.
+
+    Parameters:
+        cache_folder (str): The folder we're caching hed schema in.
+
+    Returns:
+        float: The time we last updated the cache.  Zero if no update found.
+
+    """
+    timestamp_filename = os.path.join(cache_folder, TIMESTAMP_FILENAME)
+
+    try:
+        with open(timestamp_filename, "r") as f:
+            timestamp = float(f.readline())
+            return timestamp
+    except FileNotFoundError or ValueError or IOError:
+        return 0
+
+
+def _write_last_cached_time(new_time, cache_folder):
+    """ Set the time of last cache update.
+
+    Parameters:
+        new_time (float): The time this was updated.
+        cache_folder (str): The folder used for caching the hed schema.
+
+    :raises ValueError:
+        - something went wrong writing to the file
+    """
+    timestamp_filename = os.path.join(cache_folder, TIMESTAMP_FILENAME)
+    try:
+        with open(timestamp_filename, "w") as f:
+            f.write(str(new_time))
+    except Exception:
+        raise ValueError("Error writing timestamp to hed cache")

hed/schema/schema_data/library_data/library_data.json

@@ -0,0 +1,11 @@
+{
+    "": {
+      "id_range":[10000, 39999]
+    },
+    "score": {
+      "id_range":[40000, 59999]
+    },
+    "lang": {
+      "id_range":[60000, 79999]
+    }
+}

hed/schema/schema_io/ontology_util.py

@@ -8,13 +8,10 @@
 from hed.schema import hed_schema_df_constants as constants
 from hed.schema.hed_schema_constants import HedKey
 from hed.schema.schema_io.text_util import parse_attribute_string, _parse_header_attributes_line
+from hed.schema.hed_cache import get_library_data
 
-library_index_ranges = {
-    "": (10000, 40000),
-    "score": (40000, 60000),
-    "lang": (60000, 80000)
-}
-UNKNOWN_LIBRARY_VALUE = 9910000
+
+UNKNOWN_LIBRARY_VALUE = 0
 
 object_type_id_offset = {
     constants.OBJECT_KEY: (100, 300),
@@ -39,10 +36,11 @@ def get_library_name_and_id(schema):
         library_name(str): The capitalized library name
         first_id(int): the first id for a given library
     """
-    name = schema.library
-
-    starting_id, _ = library_index_ranges.get(name, (UNKNOWN_LIBRARY_VALUE, 0))
 
+    name = schema.library
+
+    library_data = get_library_data(name)
+    starting_id, _ = library_data.get("id_range", (UNKNOWN_LIBRARY_VALUE, UNKNOWN_LIBRARY_VALUE))
     if not name:
         name = "standard"
     return name.capitalize(), starting_id
@@ -61,9 +59,10 @@ def _get_hedid_range(schema_name, df_key):
     if df_key == constants.STRUCT_KEY:
         raise NotImplementedError("Cannot assign hed_ids struct section")
 
-    if schema_name not in library_index_ranges:
+    library_data = get_library_data(schema_name)
+    if not library_data:
         return set()
-    starting_id, ending_id = library_index_ranges[schema_name]
+    starting_id, ending_id = library_data["id_range"]
 
     start_object_range, end_object_range = object_type_id_offset[df_key]
     if df_key == constants.TAG_KEY:
@@ -73,7 +72,8 @@ def _get_hedid_range(schema_name, df_key):
     final_start = starting_id + start_object_range + initial_tag_adj
     final_end = starting_id + end_object_range
     if end_object_range == -1:
-        final_end = ending_id
+        # Add one since the versions on hed-schemas are set to max_value - 1
+        final_end = ending_id + 1
     return set(range(final_start, final_end))