37 lines
1.1 KiB
Go
37 lines
1.1 KiB
Go
package aghnet
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// DefaultRefreshIvl is the default period of time between refreshing cached
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// addresses.
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// const DefaultRefreshIvl = 5 * time.Minute
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// HostGenFunc is the signature for functions generating fake hostnames. The
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// implementation must be safe for concurrent use.
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type HostGenFunc func() (host string)
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// SystemResolvers helps to work with local resolvers' addresses provided by OS.
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type SystemResolvers interface {
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// Get returns the slice of local resolvers' addresses. It must be safe for
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// concurrent use.
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Get() (rs []string)
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// refresh refreshes the local resolvers' addresses cache. It must be safe
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// for concurrent use.
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refresh() (err error)
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}
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// NewSystemResolvers returns a SystemResolvers with the cache refresh rate
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// defined by refreshIvl. It disables auto-resfreshing if refreshIvl is 0. If
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// nil is passed for hostGenFunc, the default generator will be used.
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func NewSystemResolvers(
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hostGenFunc HostGenFunc,
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) (sr SystemResolvers, err error) {
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sr = newSystemResolvers(hostGenFunc)
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// Fill cache.
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err = sr.refresh()
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if err != nil {
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return nil, err
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}
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return sr, nil
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}
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