mirror of
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32 lines
667 B
Go
32 lines
667 B
Go
package dns
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import (
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"context"
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"time"
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"github.com/FloatTech/ttl"
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"github.com/fumiama/terasu/ip"
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)
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var lookupTable = ttl.NewCache[string, []string](time.Hour)
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// LookupHost use default resolver with its fallback
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func LookupHost(ctx context.Context, host string) (addrs []string, err error) {
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addrs = lookupTable.Get(host)
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if len(addrs) == 0 {
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addrs, err = DefaultResolver.LookupHost(ctx, host)
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if err != nil {
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if ip.IsIPv6Available {
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addrs, err = IPv6Servers.lookupHostDoH(ctx, host)
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} else {
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addrs, err = IPv4Servers.lookupHostDoH(ctx, host)
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}
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if err != nil {
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return nil, err
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}
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}
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lookupTable.Set(host, addrs)
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}
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return
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}
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