update config for synse v3 (#305)

synse_server/cache.py

@@ -24,7 +24,6 @@
 )
 
 device_cache = aiocache.SimpleMemoryCache(
-    ttl=config.options.get('cache.device.ttl', None),
     namespace=NS_DEVICE,
 )
 

synse_server/config.py

@@ -20,8 +20,8 @@
         )),
     )),
     DictOption('cache', default=None, scheme=Scheme(
-        DictOption('meta', scheme=Scheme(
-            Option('ttl', default=20, field_type=int)
+        DictOption('device', scheme=Scheme(
+            Option('rebuild_every', default=180, field_type=int)  # three minutes
         )),
         DictOption('transaction', scheme=Scheme(
             Option('ttl', default=300, field_type=int)  # five minutes

synse_server/server.py

@@ -6,7 +6,7 @@
 from sanic_prometheus import monitor
 
 import synse_server
-from synse_server import app, config, plugin
+from synse_server import app, config, plugin, tasks
 from synse_server.i18n import _
 from synse_server.log import logger, setup_logger
 
@@ -105,6 +105,10 @@ def run(self):
         if self.log_header:
             sys.stdout.write(self._header)
 
+        # Add background tasks. This needs to be done at run so any tasks
+        # that take config options have the loaded config available to them.
+        tasks.register_with_app(self.app)
+
         # If application metrics are enabled, configure the application now.
         if config.options.get('metrics.enabled'):
             logger.info(_('application performance metrics enabled'))

synse_server/tasks.py

@@ -2,6 +2,7 @@
 
 import asyncio
 
+from synse_server import config
 from synse_server.cache import update_device_cache
 from synse_server.i18n import _
 from synse_server.log import logger
@@ -20,7 +21,7 @@ def register_with_app(app):
 
 async def _rebuild_device_cache():
     """Periodically rebuild the device cache."""
-    interval = 3 * 60  # 3 minutes
+    interval = config.options.get('cache.device.rebuild_every', 3 * 60)  # 3 minute default
 
     while True:
         logger.info(