Fall back onto next layer if get fails

Author: j6k4m8

bossphorus/storagemanager/_FilesystemStorageManager.py

@@ -222,7 +222,11 @@ def getdata(
             bossURI
 
         """
-        return self.fs.retrieve(col, exp, chan, res, xs, ys, zs)
+        if self.hasdata(col, exp, chan, res, xs, ys, zs):
+            return self.fs.retrieve(col, exp, chan, res, xs, ys, zs)
+        if self.is_terminal:
+            raise IndexError("Cannot find data at: ", (col, exp, chan, res, xs, ys, zs))
+        return self._next.getdata(col, exp, chan, res, xs, ys, zs)
 
     def __str__(self):
         return f"<FilesystemStorageManager [{str(self.fs)}]>"

notebooks/Using Bossphorus with Intern.ipynb

@@ -163,7 +163,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 32,
+   "execution_count": 38,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -187,7 +187,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 33,
+   "execution_count": 36,
    "metadata": {},
    "outputs": [
     {