Support for ip route save and ip route restore commands

[pseusys]

Browsing the ip command docs I have noticed three different commands for route bulk manipulation: ip route flush, ip route save and ip route restore. Sadly, it seems like only the first one is implemented in pyroute2. Is there an explanation for that? The latter two commands might be really useful for routing table manipulation. Is there any official workaround (involving IPRoute.get_routes(table=...) probably)? Could I maybe help adding support for that?
If no support is planned, could you please let me know, how can I restore a route thaat I once received with IPRoute.get_routes? It is received in a form of a dictionary.

[pseusys]

Here's a patched implementation o IPRoute class, that implements both ip route save and ip route restore commands:

class PatchedIPRoute(IPRoute):
    def save_routes(self, *argv, **kwarg):
        return list(self.get_routes(*argv, **kwarg))

    def restore_routes(self, routes):
        for route in routes:
            self.put(route, msg_type=RTM_NEWROUTE, msg_flags=NLM_F_REQUEST)

[svinota]

This might require some additional investigation if we need to serialize route objects — just not to exhaust all the memory on huge numbers of routes.

Beside of that it might be useful to make it compatible with ip route save format.

Ok, got it. Thanks for the request, I will dig around, and update you here next week.

[svinota]

@pseusys started to implement the feature, you can follow that on branch 1203-iproute-save.

[svinota]

Merged into the master branch. Some more tests and docs will be added, route_load() will be optimized, but it's usable already.

[svinota]

@pseusys I'm closing the ticket, but don't hesitate to reopen, or to open a new one in the case there will be any issues using the feature.