cache 'webservice'

isbnlib/dev/__init__.py

@@ -2,7 +2,7 @@
 """Interface for namespace 'isbnlib.dev'."""
 
 from ._data import Metadata, stdmeta
-from ._decorators import cache
+from ._decorators import cache, imcache
 from ._exceptions import (
     DataNotFoundAtServiceError,
     DataWrongShapeError,
@@ -34,4 +34,5 @@
     'WEBService',
     'WEBQuery',
     'cache',
+    'imcache',
 )

isbnlib/dev/_decorators.py

@@ -2,10 +2,13 @@
 # isort:skip_file
 """Decorator for isbnlib."""
 from functools import wraps
+from .._imcache import IMCache
+
+im_cache = IMCache(maxlen=200)
 
 
 def cache(func):
-    """Cache decorator."""
+    """Cache decorator (cache)."""
     # noqa
     @wraps(func)
     def memoized_func(*args, **kwargs):
@@ -27,3 +30,27 @@ def memoized_func(*args, **kwargs):
             return value
 
     return memoized_func
+
+
+def imcache(func):
+    """Cache decorator (imcache)."""
+    # noqa
+    @wraps(func)
+    def memoized_func(*args, **kwargs):
+        cch = im_cache
+        if cch is None:  # pragma: no cover
+            return func(*args, **kwargs)
+
+        # Persistent caches will NOT work IF
+        # 'func' has callables in the arguments
+        key = str(func.__name__) + str(args) + str(kwargs)
+
+        if key in cch:
+            return cch[key]
+        else:
+            value = func(*args, **kwargs)
+            if value:
+                cch[key] = value
+            return value
+
+    return memoized_func

isbnlib/dev/webservice.py

@@ -6,6 +6,7 @@
 from socket import timeout as sockettimeout
 
 from ..config import options
+from . import imcache
 from ._bouth23 import bstream, s
 from ._exceptions import ISBNLibHTTPError, ISBNLibURLError, ServiceIsDownError
 
@@ -100,6 +101,7 @@ def data(self):
         return s(data)
 
 
+@imcache
 def query(url, user_agent=UA, values=None, appheaders=None):
     """Query to a web service."""
     service = WEBService(