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config.go
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config.go
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/*
Copyright 2015 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 balancer
import (
"crypto/x509"
"encoding/pem"
"fmt"
)
// Config is load balancer configuration scheme not tied to any LB implementation
type Config struct {
Options map[string]string
Exposed map[string]Exposed
Upstreams map[string]Upstream
}
// Exposed is a exposed server specification
type Exposed struct {
BindPort int
Certificates []Certificate
Options map[string]string
HostName string
PathBegins string
IsDefault bool
Upstream *Upstream
}
// Name returns an unique name based on BindPorts, Hostname and Path
func (exp *Exposed) Name() string {
n := fmt.Sprintf("port%d", exp.BindPort)
if exp.IsDefault {
n = fmt.Sprintf("%s.defaulthost", n)
} else {
n = fmt.Sprintf("%s.host-%s", n, exp.HostName)
}
if exp.PathBegins != "" && exp.PathBegins != "/" {
n = fmt.Sprintf("%s.path-%s", n, exp.PathBegins)
}
return n
}
// Upstream servers manage request after they are received at the balancer
type Upstream struct {
Name string
Options map[string]string
Endpoints []Endpoint
}
// Certificate x509 in PEM format
type Certificate struct {
Name string
Domains []string
Private []byte
Public []byte
}
// Endpoint for an upstream server
type Endpoint struct {
Options map[string]string
IP string
Port int
}
// NewDefaultLBConfig returns an LBConfig with defaults
func NewDefaultLBConfig() Config {
return Config{}
}
// NewCertificate creates a certificate
func NewCertificate(priv, pub []byte, name string) (*Certificate, error) {
cert := append(pub, '\n')
cert = append(cert, priv...)
block, _ := pem.Decode(cert)
if block == nil {
return nil, fmt.Errorf("certificate %v is not pem formatted", name)
}
c509, err := x509.ParseCertificate(block.Bytes)
if err != nil {
return nil, fmt.Errorf("certificate %v is not a valid x509 certificate: %v", name, err)
}
d := []string{c509.Subject.CommonName}
if len(c509.DNSNames) > 0 {
d = append(d, c509.DNSNames...)
}
c := &Certificate{
Name: name,
Private: priv,
Public: pub,
Domains: d,
}
return c, nil
}