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filter.go
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/
filter.go
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package addrutil
import (
ma "github.com/dms3-mft/go-multiaddr"
// mafmt "github.com/whyrusleeping/mafmt" // imports from multiformats, use ours
mafmt "github.com/dms3-why/mafmt"
)
// SubtractFilter returns a filter func that filters all of the given addresses
func SubtractFilter(addrs ...ma.Multiaddr) func(ma.Multiaddr) bool {
addrmap := make(map[string]bool, len(addrs))
for _, a := range addrs {
addrmap[string(a.Bytes())] = true
}
return func(a ma.Multiaddr) bool {
return !addrmap[string(a.Bytes())]
}
}
// IsFDCostlyTransport returns true for transports that require a new file
// descriptor per connection created
func IsFDCostlyTransport(a ma.Multiaddr) bool {
return mafmt.TCP.Matches(a)
}
// FilterNeg returns a negated version of the passed in filter
func FilterNeg(f func(ma.Multiaddr) bool) func(ma.Multiaddr) bool {
return func(a ma.Multiaddr) bool {
return !f(a)
}
}