add configurable cache timeout value, default is 2 year.

Signed-off-by: Timothée Peignier <timothee.peignier@tryphon.org>

pipeline/conf/settings.py

@@ -15,6 +15,8 @@ PIPELINE_VERSION_DEFAULT = getattr(settings, 'PIPELINE_VERSION_DEFAULT', '0')
 PIPELINE_VERSION_REMOVE_OLD = getattr(settings, 'PIPELINE_VERSION_REMOVE_OLD', True)
 PIPELINE_VERSIONING = getattr(settings, 'PIPELINE_VERSIONING', 'pipeline.versioning.mtime.MTimeVersioning')
 
+PIPELINE_CACHE_TIMEOUT = getattr(settings, 'PIPELINE_CACHE_TIMEOUT', 63072000)
+
 PIPELINE_STORAGE = getattr(settings, 'PIPELINE_STORAGE',
     'pipeline.storage.PipelineStorage')
 

pipeline/signals.py

@@ -3,6 +3,8 @@ import os
 from django.core.cache import cache
 from django.dispatch import Signal, receiver
 
+from pipeline.conf import settings
+
 
 css_compressed = Signal(providing_args=["package", "version"])
 js_compressed = Signal(providing_args=["package", "version"])
@@ -12,4 +14,5 @@ js_compressed = Signal(providing_args=["package", "version"])
 @receiver(js_compressed)
 def invalidate_cache(sender, package, version, **kwargs):
     filename_base, filename = os.path.split(package['output'])
-    cache.set("pipeline:%s" % filename, str(version))
+    cache.set("pipeline:%s" % filename, str(version),
+        settings.PIPELINE_CACHE_TIMEOUT)

pipeline/versioning/__init__.py

@@ -30,7 +30,7 @@ class Versioning(object):
                 if match and match.groups():
                     version = match.group(1)
                     break
-            cache.set("pipeline:%s" % filename, version)
+            cache.set("pipeline:%s" % filename, version, settings.PIPELINE_CACHE_TIMEOUT)
         return str(version)
 
     def output_filename(self, filename, version):