auto reload map

ffmap/mapnik/dynmapnik.py

@@ -0,0 +1,18 @@
+#!/usr/bin/python2
+
+import os
+import logging
+import TileStache
+
+class DynMapnik(TileStache.Providers.Mapnik):
+	def __init__(self, *args, **kwargs):
+		self.mapfile_mtime = 0
+		TileStache.Providers.Mapnik.__init__(self, *args, **kwargs)
+	def renderArea(self, *args, **kwargs):
+		cur_mapfile_mtime = os.path.getmtime(self.mapfile)
+		if cur_mapfile_mtime > self.mapfile_mtime:
+			self.mapfile_mtime = cur_mapfile_mtime
+			if self.mapnik is not None:
+				self.mapnik = None
+				logging.info('TileStache.DynMapnik.ImageProvider.renderArea() detected mapfile change')
+		return TileStache.Providers.Mapnik.renderArea(self, *args, **kwargs)

ffmap/mapnik/setup.py

@@ -0,0 +1,7 @@
+#!/usr/bin/python2
+
+from distutils.core import setup
+setup(name='dynmapnik',
+      version='1.0',
+      py_modules=['dynmapnik'],
+)

ffmap/mapnik/tilestache.cfg

@@ -6,27 +6,24 @@
 	"layers": {
 		"tiles/links_and_routers": {
 			"provider": {
-				"name": "mapnik",
-				"mapfile": "/usr/share/ffmap/links_and_routers.xml",
-				"layers": [
-					[0, null],
-					[1, null]
-				]
+				"class": "dynmapnik:DynMapnik",
+				"kwargs": {
+					"mapfile": "/usr/share/ffmap/links_and_routers.xml"
+				}
 			},
 			"metatile": {"buffer": 128},
 			"cache lifespan": 300
 		},
 		"tiles/hoods": {
 			"provider": {
-				"name":	"mapnik",
-				"mapfile": "/usr/share/ffmap/hoods.xml",
-				"layers": [
-					[0, null],
-					[1, null]
-				]
+				"class": "dynmapnik:DynMapnik",
+				"kwargs": {
+					"mapfile": "/usr/share/ffmap/hoods.xml"
+				}
 			},
 			"metatile": {"buffer": 128},
 			"cache lifespan": 300
 		}
-	}
+	},
+	"logging": "info"
 }

install.sh

@@ -20,3 +20,5 @@ cp -v ffmap/systemd/*.service /etc/systemd/system/
 systemctl daemon-reload
 
 python3 setup.py install --force
+
+(cd ffmap/mapnik; python2 setup.py install)