43 lines
1014 B
Go
43 lines
1014 B
Go
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package main
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import "fmt"
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type AddressCounter = int
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type Ip4AddressAllocator struct {
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networks map[int]AddressCounter
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}
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func (a *Ip4AddressAllocator) AddNetwork(networkNumber int) {
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a.networks[networkNumber] = 1
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}
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func (a *Ip4AddressAllocator) NewIp4InterfaceAddress(inputNetworkNumber ...int) (string, error) {
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var networkNumber int = 0
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if len(inputNetworkNumber) > 0 {
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networkNumber = inputNetworkNumber[0]
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}
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if _, ok := a.networks[networkNumber]; !ok {
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a.AddNetwork(networkNumber)
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}
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numberOfAddresses := a.networks[networkNumber]
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if numberOfAddresses == 254 {
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return "", fmt.Errorf("no available IPv4 addresses")
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}
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address := fmt.Sprintf("10.10.%v.%v/24", networkNumber, numberOfAddresses)
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a.networks[networkNumber] = numberOfAddresses + 1
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return address, nil
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}
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func NewIp4AddressAllocator() *Ip4AddressAllocator {
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var ip4AddrAllocator = new(Ip4AddressAllocator)
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ip4AddrAllocator.networks = make(map[int]AddressCounter)
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ip4AddrAllocator.AddNetwork(0)
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return ip4AddrAllocator
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}
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