Go1.18から導入されるnetip package/netip-package

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2. Appify Technologies CTO ͦͳଠ @sonatard
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   w NBQͷ,FZʹ࢖͑Δ package net type IP []byte package netip type Addr struct { addr uint128 z *intern.Value }
6. 6 OFUOFUJQ
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8. 8 OFUOFUJQ
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   w NBQͷ,FZʹ࢖͑Δ package net type IP []byte package netip type Addr struct { addr uint128 z *intern.Value }
9. 9 OFUOFUJQ
   QBDLBHFͱ͸ w লϝϞϦ package net type IP []byte package netip type Addr struct { addr uint128 z *intern.Value } ip := make(net.IP, net.IPv6len) ipSize := len([net.IPv6len]net.IP{}) fmt.Printf("net.IP([%v]byte) Size = %vbyte\n”, net.IPv6len, int(unsafe.Sizeof(ip))+ipSize) var addr netip.Addr fmt.Printf("netip.Addr Size = %vbyte\n", unsafe.Sizeof(addr)) // https://gotipplay.golang.org/p/xrkMg5Nw67g // net.IP([16]byte) Size = 40byte // netip.Addr Size = 24byte w 4MJDF
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   CZUFΑΓେ͖͍ʜ type SliceHeader struct { Data uintptr Len int Cap int }
10. 10 OFUOFUJQ
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    w ώʔϓͷ֬อΛ͢Δ͜ͱ͕ͳ͍ͷͰ଎͘ͳΔ package netip type Addr struct { addr uint128 z *intern.Value }
11. 11 OFUOFUJQ
    QBDLBHFͱ͸ w ෆม
    w *1ܕ͸εϥΠεͳͷͰෆมΛ࣮ݱͰ͖ͳ͔ͬͨ package net type IP []byte package netip type Addr struct { addr uint128 z *intern.Value }
12. 12 OFUOFUJQ
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    w *1ܕ͸εϥΠεͳͷͰɺϙΠϯλͷൺֱʹͳͬͯ͠·͍ൺֱͰ͖ͳ͔ͬͨ addr := netip.MustParseAddr("192.168.1.1") addr2 := netip.MustParseAddr("192.168.1.1") fmt.Printf("%v\n", addr == addr2) // true addr3 := netip.MustParseAddr("192.168.1.2") fmt.Printf("%v\n", addr == addr3) // false package netip type Addr struct { addr uint128 z *intern.Value }
13. 13 OFUOFUJQ
    QBDLBHFͱ͸ w NBQͷ,FZʹ࢖͑Δ addr := netip.MustParseAddr("192.168.1.1") addrKeyMap := map[netip.Addr]string{addr: "IPv4ΞυϨε"} fmt.Printf("%v\n", addrKeyMap) package netip type Addr struct { addr uint128 z *intern.Value }
14. 14 OFUOFUJQ
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    w package netip type Addr struct { addr uint128 z *intern.Value } type uint128 struct { hi uint64 lo uint64 } // For example, 0011:2233:4455:6677:8899:aabb:ccdd:eeff is stored as: // addr.hi = 0x0011223344556677 // addr.lo = 0x8899aabbccddeeff
15. 15 OFUOFUJQ
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16. 16 OFUOFUJQ
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18. 18 OFUOFUJQ
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19. 19 OFUOFUJQ
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    w ࠓ·ͰOFU*1ܕपลͷ*1ΞυϨεʹؔ͢Δૢ࡞ͷϝιου͸ɺOFUJQ"EESܕʹ΋ఏڙ ͞Ε͍ͯΔ func (ip Addr) IsPrivate() bool { // Match the stdlib's IsPrivate logic. if ip.Is4() { // RFC 1918 allocates 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 as // private IPv4 address subnets. return ip.v4(0) == 10 || (ip.v4(0) == 172 && ip.v4(1)&0xf0 == 16) || (ip.v4(0) == 192 && ip.v4(1) == 168) } if ip.Is6() { // RFC 4193 allocates fc00::/7 as the unique local unicast IPv6 address // subnet. return ip.v6(0)&0xfe == 0xfc } return false // zero value }
20. 20 OFUOFUJQ
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21. 21 OFUOFUJQ
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    "EES1PSUɺ-PPLVQ/FU*1ͳͲ func (r *Resolver) LookupNetIP(ctx context.Context, network, host string) ([]netip.Addr, error) { // TODO(bradfitz): make this efficient, making the internal net package // type throughout be netip.Addr and only converting to the net.IP slice // version at the edge. But for now (2021-10-20), this is a wrapper around // the old way. ips, err := r.LookupIP(ctx, network, host) if err != nil { return nil, err } ret := make([]netip.Addr, 0, len(ips)) for _, ip := range ips { if a, ok := netip.AddrFromSlice(ip); ok { ret = append(ret, a) } } return ret, nil }
22. 22 OFUOFUJQ
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23. 23 OFUOFUJQ
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    w OFUJQ"EESܕΛར༻͢ΔɺඞཁʹԠͯ͡OFU*1ܕʹม׵ # net.IP -> netip.Addr ip := net.ParseIP("192.168.1.1") if addr, ok := netip.AddrFromSlice(ip); ok { fmt.Printf("%v\n", addr) } # netip.Addr -> net.IP addr := netip.MustParseAddr("192.168.1.1") ip := net.IP(addr.AsSlice()) fmt.Printf("ip: %v\n", ip)
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