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spec.go
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spec.go
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package crd
import (
"fmt"
"strconv"
"time"
"github.com/dogmatiq/dissolve/dnssd"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
// Instance is a DNS-SD service instance.
type Instance struct {
Name string `json:"name"`
ServiceType string `json:"serviceType"`
Domain string `json:"domain"`
TTL metav1.Duration `json:"ttl,omitempty"`
Targets [1]Target `json:"targets"`
Attributes []map[string]any `json:"attributes,omitempty"`
}
// Target describes a single target address for a DNS service instance.
type Target struct {
Host string `json:"host"`
Port uint16 `json:"port"`
Priority uint16 `json:"priority,omitempty"`
Weight uint16 `json:"weight,omitempty"`
}
// DNSSDServiceInstanceSpec is the specification for a service instance.
type DNSSDServiceInstanceSpec struct {
Instance Instance `json:"instance"`
}
// ToDissolve returns a Dissolve dnssd.Instance from a CRD service instance
// specification.
func (s DNSSDServiceInstanceSpec) ToDissolve() dnssd.ServiceInstance {
inst := dnssd.ServiceInstance{
ServiceInstanceName: dnssd.ServiceInstanceName{
Name: s.Instance.Name,
ServiceType: s.Instance.ServiceType,
Domain: s.Instance.Domain,
},
TargetHost: s.Instance.Targets[0].Host,
TargetPort: s.Instance.Targets[0].Port,
Priority: s.Instance.Targets[0].Priority,
Weight: s.Instance.Targets[0].Weight,
TTL: s.Instance.TTL.Duration,
}
if inst.TTL == 0 {
inst.TTL = 60 * time.Second
}
for _, src := range s.Instance.Attributes {
var dst dnssd.Attributes
for k, v := range src {
switch v := v.(type) {
case bool:
if v {
dst = dst.WithFlag(k)
}
case string:
dst = dst.WithPair(k, []byte(v))
case int64:
s := strconv.FormatInt(v, 10)
dst = dst.WithPair(k, []byte(s))
case float64:
s := strconv.FormatFloat(v, 'g', -1, 64)
dst = dst.WithPair(k, []byte(s))
case nil:
// ignore
default:
// TODO: A validating web-hook will make it so this branch
// cannot be reached.
panic(fmt.Sprintf("unsupported attribute value: %s = %T", k, v))
}
}
if !dst.IsEmpty() {
inst.Attributes = append(inst.Attributes, dst)
}
}
return inst
}