initial code towards services that will generate files from templates and provide configuration

daemon/core/configservices/defaultroute/service.py

@@ -0,0 +1,47 @@
+import logging
+
+import netaddr
+
+from core.configservice.base import ConfigService, ConfigServiceMode
+from core.emulator.session import Session
+from core.nodes.base import CoreNode
+from core.nodes.interface import Veth
+
+
+class DefaultRoute(ConfigService):
+    name = "DefaultRoute"
+    group = "Utility"
+    executables = []
+    dependencies = []
+    startup = []
+    validate = []
+    shutdown = []
+    validation_mode = ConfigServiceMode.BLOCKING
+
+    def create_files(self):
+        self.create_default_route()
+
+    def create_default_route(self):
+        addresses = []
+        for netif in self.node.netifs():
+            if getattr(netif, "control", False):
+                continue
+            for addr in netif.addrlist:
+                net = netaddr.IPNetwork(addr)
+                if net[1] != net[-2]:
+                    addresses.append(net[1])
+        data = dict(addresses=addresses)
+        self.render("defaultroute.sh", data)
+
+
+if __name__ == "__main__":
+    logging.basicConfig(level=logging.INFO)
+    session = Session(1, mkdir=False)
+    node = CoreNode(session, _id=1, start=False)
+    netif = Veth(session, node, "eth0", "eth0", start=False)
+    netif.addaddr("10.0.0.1/24")
+    node.addnetif(netif, 0)
+    service = DefaultRoute(node)
+    service.create_files()
+    # data = service.render(node, "defaultroute.sh", dict(addresses=[]))
+    # print(data)

daemon/core/configservices/defaultroute/templates/defaultroute.sh

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+#!/bin/sh
+# auto-generated by DefaultRoute service
+% for address in addresses:
+ip route add default via ${address}
+% endfor