Patch for leapsecond delayed finding/loading.

curryer/kernels/attitude.py

@@ -16,8 +16,6 @@
 
 logger = logging.getLogger(__name__)
 
-DEFAULT_LSK_FILE = str(spicetime.leapsecond.find_default_file())
-
 
 class AttitudeTypes(Enum):
     """Attitude kernel types.
@@ -84,7 +82,7 @@ class AbstractAttitudeProperties(AbstractKernelProperties):
     ck_type: TypedDataDescriptor = TypedDataDescriptor(default=AttitudeTypes.LINEAR_QUAT, dtype=AttitudeTypes)
 
     # Existing kernels that are required to build this one.
-    leapsecond_kernel: str = DEFAULT_LSK_FILE
+    leapsecond_kernel: str = None
     frame_kernel: str = None
     clock_kernel: str = None
     create_clock: bool = False  # If true, writes to `clock_kernel`.

curryer/kernels/classes.py

@@ -22,8 +22,6 @@
 
 logger = logging.getLogger(__name__)
 
-DEFAULT_LSK_FILE = str(spicetime.leapsecond.find_default_file())
-
 
 class TypedDataDescriptor:
     """Data descriptor that enforces typing through casting.
@@ -68,7 +66,7 @@ class AbstractKernelProperties:
     input_gap_threshold: str = None
 
     # Existing kernels that are required to build this one.
-    leapsecond_kernel: str = DEFAULT_LSK_FILE
+    leapsecond_kernel: str = None
 
     # Misc.
     version: int = 1
@@ -80,6 +78,9 @@ def __post_init__(self):
         if self.SUPPORTED_INPUT_DATA_TYPES is not None and self.input_data_type not in self.SUPPORTED_INPUT_DATA_TYPES:
             raise ValueError(f'Invalid properties class for input type {self.input_data_type}')
 
+        if self.leapsecond_kernel is None:
+            self.leapsecond_kernel = str(spicetime.leapsecond.find_default_file())
+
         if self.relative_dir:
             self.relative_dir = Path(self.relative_dir)
         self._update_paths(['leapsecond_kernel'])

curryer/kernels/ephemeris.py

@@ -18,8 +18,6 @@
 
 logger = logging.getLogger(__name__)
 
-DEFAULT_LSK_FILE = str(spicetime.leapsecond.find_default_file())
-
 
 class EphemerisTypes(Enum):
     """Ephemeris kernel types.
@@ -88,7 +86,7 @@ class AbstractEphemerisProperties(AbstractKernelProperties):
     spk_type: str = None
 
     # Existing kernels that are required to build this one.
-    leapsecond_kernel: str = DEFAULT_LSK_FILE
+    leapsecond_kernel: str = None
     planet_kernels: typing.List[str] = None  # Optional
 
     def __post_init__(self):

curryer/spicetime/leapsecond.py

@@ -12,6 +12,7 @@
 """
 import datetime
 import logging
+import os
 import re
 import time
 import warnings
@@ -30,6 +31,8 @@
 _LEAPSECOND_FILE_GLOB = 'naif*.tls'
 LEAPSECOND_BASE_URL = 'https://naif.jpl.nasa.gov/pub/naif/generic_kernels/lsk/'
 
+LEAPSECOND_USER_FILE_PATH = None
+
 
 def find_default_file():
     """Find the library's default leapsecond kernel file.
@@ -43,8 +46,13 @@ def find_default_file():
     # Locate the latest kernel file, relative to this module file.
     #   Pylint thinks the `Path` class is really a `PurePath`.
     # pylint: disable=no-member
-    path = Path(__file__).parent
-    path = path.joinpath(_LEAPSECOND_FILE_PATH).resolve()
+    if LEAPSECOND_USER_FILE_PATH is not None:
+        path = Path(LEAPSECOND_USER_FILE_PATH)
+    elif os.getenv('LEAPSECOND_FILE_ENV', None):
+        path = Path(os.getenv('LEAPSECOND_FILE_ENV'))
+    else:
+        path = Path(__file__).parent
+        path = path.joinpath(_LEAPSECOND_FILE_PATH).resolve()
     leapsecond_files = list(path.glob(_LEAPSECOND_FILE_GLOB))
     leapsecond_files.sort()
 

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "lasp-curryer"
-version = "0.0.5"
+version = "0.0.6"
 packages = [
     { include = "curryer" }
 ]