diff options
Diffstat (limited to 'middleware/kubernetes/msg/service.go')
| -rw-r--r-- | middleware/kubernetes/msg/service.go | 171 |
1 files changed, 0 insertions, 171 deletions
diff --git a/middleware/kubernetes/msg/service.go b/middleware/kubernetes/msg/service.go deleted file mode 100644 index 24af6b4fd..000000000 --- a/middleware/kubernetes/msg/service.go +++ /dev/null @@ -1,171 +0,0 @@ -package msg - -import ( - "net" - "strings" - - "github.com/miekg/dns" -) - -// This *is* the rdata from a SRV record, but with a twist. -// Host (Target in SRV) must be a domain name, but if it looks like an IP -// address (4/6), we will treat it like an IP address. -type Service struct { - Host string `json:"host,omitempty"` - Port int `json:"port,omitempty"` - Priority int `json:"priority,omitempty"` - Weight int `json:"weight,omitempty"` - Text string `json:"text,omitempty"` - Mail bool `json:"mail,omitempty"` // Be an MX record. Priority becomes Preference. - Ttl uint32 `json:"ttl,omitempty"` - - // When a SRV record with a "Host: IP-address" is added, we synthesize - // a srv.Target domain name. Normally we convert the full Key where - // the record lives to a DNS name and use this as the srv.Target. When - // TargetStrip > 0 we strip the left most TargetStrip labels from the - // DNS name. - TargetStrip int `json:"targetstrip,omitempty"` - - // Group is used to group (or *not* to group) different services - // together. Services with an identical Group are returned in the same - // answer. - Group string `json:"group,omitempty"` - - // Etcd key where we found this service and ignored from json un-/marshalling - Key string `json:"-"` -} - -// NewSRV returns a new SRV record based on the Service. -func (s *Service) NewSRV(name string, weight uint16) *dns.SRV { - host := targetStrip(dns.Fqdn(s.Host), s.TargetStrip) - - return &dns.SRV{Hdr: dns.RR_Header{Name: name, Rrtype: dns.TypeSRV, Class: dns.ClassINET, Ttl: s.Ttl}, - Priority: uint16(s.Priority), Weight: weight, Port: uint16(s.Port), Target: dns.Fqdn(host)} -} - -// NewMX returns a new MX record based on the Service. -func (s *Service) NewMX(name string) *dns.MX { - host := targetStrip(dns.Fqdn(s.Host), s.TargetStrip) - - return &dns.MX{Hdr: dns.RR_Header{Name: name, Rrtype: dns.TypeMX, Class: dns.ClassINET, Ttl: s.Ttl}, - Preference: uint16(s.Priority), Mx: host} -} - -// NewA returns a new A record based on the Service. -func (s *Service) NewA(name string, ip net.IP) *dns.A { - return &dns.A{Hdr: dns.RR_Header{Name: name, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: s.Ttl}, A: ip} -} - -// NewAAAA returns a new AAAA record based on the Service. -func (s *Service) NewAAAA(name string, ip net.IP) *dns.AAAA { - return &dns.AAAA{Hdr: dns.RR_Header{Name: name, Rrtype: dns.TypeAAAA, Class: dns.ClassINET, Ttl: s.Ttl}, AAAA: ip} -} - -// NewCNAME returns a new CNAME record based on the Service. -func (s *Service) NewCNAME(name string, target string) *dns.CNAME { - return &dns.CNAME{Hdr: dns.RR_Header{Name: name, Rrtype: dns.TypeCNAME, Class: dns.ClassINET, Ttl: s.Ttl}, Target: dns.Fqdn(target)} -} - -// NewTXT returns a new TXT record based on the Service. -func (s *Service) NewTXT(name string) *dns.TXT { - return &dns.TXT{Hdr: dns.RR_Header{Name: name, Rrtype: dns.TypeTXT, Class: dns.ClassINET, Ttl: s.Ttl}, Txt: split255(s.Text)} -} - -// NewNS returns a new NS record based on the Service. -func (s *Service) NewNS(name string) *dns.NS { - host := targetStrip(dns.Fqdn(s.Host), s.TargetStrip) - return &dns.NS{Hdr: dns.RR_Header{Name: name, Rrtype: dns.TypeNS, Class: dns.ClassINET, Ttl: s.Ttl}, Ns: host} -} - -// NewPTR returns a new PTR record based on the Service. -func (s *Service) NewPTR(name string, target string) *dns.PTR { - return &dns.PTR{Hdr: dns.RR_Header{Name: name, Rrtype: dns.TypePTR, Class: dns.ClassINET, Ttl: s.Ttl}, Ptr: dns.Fqdn(target)} -} - -// Group checks the services in sx, it looks for a Group attribute on the shortest -// keys. If there are multiple shortest keys *and* the group attribute disagrees (and -// is not empty), we don't consider it a group. -// If a group is found, only services with *that* group (or no group) will be returned. -func Group(sx []Service) []Service { - if len(sx) == 0 { - return sx - } - - // Shortest key with group attribute sets the group for this set. - group := sx[0].Group - slashes := strings.Count(sx[0].Key, "/") - length := make([]int, len(sx)) - for i, s := range sx { - x := strings.Count(s.Key, "/") - length[i] = x - if x < slashes { - if s.Group == "" { - break - } - slashes = x - group = s.Group - } - } - - if group == "" { - return sx - } - - ret := []Service{} // with slice-tricks in sx we can prolly save this allocation (TODO) - - for i, s := range sx { - if s.Group == "" { - ret = append(ret, s) - continue - } - - // Disagreement on the same level - if length[i] == slashes && s.Group != group { - return sx - } - - if s.Group == group { - ret = append(ret, s) - } - } - return ret -} - -// Split255 splits a string into 255 byte chunks. -func split255(s string) []string { - if len(s) < 255 { - return []string{s} - } - sx := []string{} - p, i := 0, 255 - for { - if i <= len(s) { - sx = append(sx, s[p:i]) - } else { - sx = append(sx, s[p:]) - break - - } - p, i = p+255, i+255 - } - - return sx -} - -// targetStrip strips "targetstrip" labels from the left side of the fully qualified name. -func targetStrip(name string, targetStrip int) string { - if targetStrip == 0 { - return name - } - - offset, end := 0, false - for i := 0; i < targetStrip; i++ { - offset, end = dns.NextLabel(name, offset) - } - if end { - // We overshot the name, use the orignal one. - offset = 0 - } - name = name[offset:] - return name -} |