Cannot "Insert" simple bridge

[amorenoz]

Currently on main, if you try the simplest of examples (example/play_with_ovs) you get the following error

021/11/04 12:16:04 libovsdb: "caller"={"file":"client.go","line":701} "level"=5 "msg"="transacting operations" "database"="Open_vSwitch" "database"="Open_vSwitch" "operations"="[{Op:insert Table:Bridge Row:map[flood_vlans:{GoSet:[0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]} mcast_snooping_enable:false name:bb rstp_enable:false stp_enable:false] Rows:[] Columns:[] Mutations:[] Timeout:0 Where:[] Until: Durable:<nil> Comment:<nil> Lock:<nil> UUIDName:gopher} {Op:mutate Table:Open_vSwitch Row:map[] Rows:[] Columns:[] Mutations:[{Column:bridges Mutator:insert Value:{GoSet:[{GoUUID:gopher}]}}] Timeout:0 Where:[where column _uuid == {06676650-6c13-4236-bb91-a3ca8a476272}] Until: Durable:<nil> Comment:<nil> Lock:<nil> UUIDName:}]"
ovsdb error: set contains duplicate
2021/11/04 12:16:04 1 ovsdb operations failed

The reason is that the default initialization of FloodVlans [4096] int is a fully populated array full of zeros, which is considered non-default and incorrectly sent to the server as part of the row

[amorenoz]

another TODO: use the full database model in example/vswitchd in our integration test!

[amorenoz]

@dave-tucker I guess the easiest fix is to change bindings.IsDefaultValue, wdyt?

[dave-tucker]

@amorenoz yes I think that would be easiest... we could also not use arrays - which doesn't give us bounds checking any more 😢 but it might make the code simpler.

[amorenoz]

bounds checking could be implemented somewhere in the bindings layer even if the native type is a slice