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package cidr
import (
"fmt"
"net"
"github.com/apparentlymart/go-cidr/cidr"
"github.com/zclconf/go-cty/cty"
"github.com/zclconf/go-cty/cty/function"
"github.com/zclconf/go-cty/cty/gocty"
)
// HostFunc is a function that calculates a full host IP address within a given
// IP network address prefix.
var HostFunc = function.New(&function.Spec{
Params: []function.Parameter{
{
Name: "prefix",
Type: cty.String,
},
{
Name: "hostnum",
Type: cty.Number,
},
},
Type: function.StaticReturnType(cty.String),
Impl: func(args []cty.Value, retType cty.Type) (ret cty.Value, err error) {
var hostNum int
if err := gocty.FromCtyValue(args[1], &hostNum); err != nil {
return cty.UnknownVal(cty.String), err
}
_, network, err := net.ParseCIDR(args[0].AsString())
if err != nil {
return cty.UnknownVal(cty.String), fmt.Errorf("invalid CIDR expression: %s", err)
}
ip, err := cidr.Host(network, hostNum)
if err != nil {
return cty.UnknownVal(cty.String), err
}
return cty.StringVal(ip.String()), nil
},
})
// Host calculates a full host IP address within a given IP network address prefix.
func Host(prefix, hostnum cty.Value) (cty.Value, error) {
return HostFunc.Call([]cty.Value{prefix, hostnum})
}
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