4eafc1a2e1
We already get the connected hook, so in there we can add to a hash table of suitable peers. Rather than subscribe to disconnection, we simply remove the peer if a sendcustommsg fails. This does make after_send_scb_single() a bit more complex, since it needs this specific node_id: we use a `struct info` per node and a pointer to a shared "idx" reference counter. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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