/
endpoints.go
131 lines (106 loc) · 3.83 KB
/
endpoints.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
/*
Copyright 2018 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package controller
import (
"fmt"
"net"
"reflect"
"strconv"
"strings"
"k8s.io/apimachinery/pkg/util/intstr"
"k8s.io/apimachinery/pkg/util/validation"
"k8s.io/klog/v2"
corev1 "k8s.io/api/core/v1"
"k8s.io/ingress-nginx/internal/ingress"
"k8s.io/ingress-nginx/internal/k8s"
)
// getEndpoints returns a list of Endpoint structs for a given service/target port combination.
func getEndpoints(s *corev1.Service, port *corev1.ServicePort, proto corev1.Protocol,
getServiceEndpoints func(string) (*corev1.Endpoints, error)) []ingress.Endpoint {
upsServers := []ingress.Endpoint{}
if s == nil || port == nil {
return upsServers
}
// using a map avoids duplicated upstream servers when the service
// contains multiple port definitions sharing the same targetport
processedUpstreamServers := make(map[string]struct{})
svcKey := k8s.MetaNamespaceKey(s)
// ExternalName services
if s.Spec.Type == corev1.ServiceTypeExternalName {
if ip := net.ParseIP(s.Spec.ExternalName); s.Spec.ExternalName == "localhost" ||
(ip != nil && ip.IsLoopback()) {
klog.Errorf("Invalid attempt to use localhost name %s in %q", s.Spec.ExternalName, svcKey)
return upsServers
}
klog.V(3).Infof("Ingress using Service %q of type ExternalName.", svcKey)
targetPort := port.TargetPort.IntValue()
// if the externalName is not an IP address we need to validate is a valid FQDN
if net.ParseIP(s.Spec.ExternalName) == nil {
externalName := strings.TrimSuffix(s.Spec.ExternalName, ".")
if errs := validation.IsDNS1123Subdomain(externalName); len(errs) > 0 {
klog.Errorf("Invalid DNS name %s: %v", s.Spec.ExternalName, errs)
return upsServers
}
}
return append(upsServers, ingress.Endpoint{
Address: s.Spec.ExternalName,
Port: fmt.Sprintf("%v", targetPort),
})
}
klog.V(3).Infof("Getting Endpoints for Service %q and port %v", svcKey, port.String())
ep, err := getServiceEndpoints(svcKey)
if err != nil {
klog.Warningf("Error obtaining Endpoints for Service %q: %v", svcKey, err)
return upsServers
}
for _, ss := range ep.Subsets {
matchedPortNameFound := false
for i, epPort := range ss.Ports {
if !reflect.DeepEqual(epPort.Protocol, proto) {
continue
}
var targetPort int32
if port.Name == "" {
// port.Name is optional if there is only one port
targetPort = epPort.Port
matchedPortNameFound = true
} else if port.Name == epPort.Name {
targetPort = epPort.Port
matchedPortNameFound = true
}
if i == len(ss.Ports)-1 && !matchedPortNameFound && port.TargetPort.Type == intstr.Int {
// use service target port if it's a number and no port name matched
// https://github.com/kubernetes/ingress-nginx/issues/7390
targetPort = port.TargetPort.IntVal
}
if targetPort <= 0 {
continue
}
for _, epAddress := range ss.Addresses {
ep := net.JoinHostPort(epAddress.IP, strconv.Itoa(int(targetPort)))
if _, exists := processedUpstreamServers[ep]; exists {
continue
}
ups := ingress.Endpoint{
Address: epAddress.IP,
Port: fmt.Sprintf("%v", targetPort),
Target: epAddress.TargetRef,
}
upsServers = append(upsServers, ups)
processedUpstreamServers[ep] = struct{}{}
}
}
}
klog.V(3).Infof("Endpoints found for Service %q: %v", svcKey, upsServers)
return upsServers
}