traefik/types/types.go

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package types
import (
"errors"
"github.com/ryanuber/go-glob"
"strings"
)
// Backend holds backend configuration.
type Backend struct {
Servers map[string]Server `json:"servers,omitempty"`
CircuitBreaker *CircuitBreaker `json:"circuitBreaker,omitempty"`
LoadBalancer *LoadBalancer `json:"loadBalancer,omitempty"`
MaxConn *MaxConn `json:"maxConn,omitempty"`
}
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// MaxConn holds maximum connection configuration
type MaxConn struct {
Amount int64 `json:"amount,omitempty"`
ExtractorFunc string `json:"extractorFunc,omitempty"`
}
// LoadBalancer holds load balancing configuration.
type LoadBalancer struct {
Method string `json:"method,omitempty"`
}
// CircuitBreaker holds circuit breaker configuration.
type CircuitBreaker struct {
Expression string `json:"expression,omitempty"`
}
// Server holds server configuration.
type Server struct {
URL string `json:"url,omitempty"`
Weight int `json:"weight,omitempty"`
}
// Route holds route configuration.
type Route struct {
Rule string `json:"rule,omitempty"`
// ⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠
// TODO: backwards compatibility with DEPRECATED rule.Value
Value string `json:"value,omitempty"`
// ⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠
}
// Frontend holds frontend configuration.
type Frontend struct {
EntryPoints []string `json:"entryPoints,omitempty"`
Backend string `json:"backend,omitempty"`
Routes map[string]Route `json:"routes,omitempty"`
PassHostHeader bool `json:"passHostHeader,omitempty"`
}
// LoadBalancerMethod holds the method of load balancing to use.
type LoadBalancerMethod uint8
const (
// Wrr (default) = Weighted Round Robin
Wrr LoadBalancerMethod = iota
// Drr = Dynamic Round Robin
Drr
)
var loadBalancerMethodNames = []string{
"Wrr",
"Drr",
}
// NewLoadBalancerMethod create a new LoadBalancerMethod from a given LoadBalancer.
func NewLoadBalancerMethod(loadBalancer *LoadBalancer) (LoadBalancerMethod, error) {
if loadBalancer != nil {
for i, name := range loadBalancerMethodNames {
if strings.EqualFold(name, loadBalancer.Method) {
return LoadBalancerMethod(i), nil
}
}
}
return Wrr, ErrInvalidLoadBalancerMethod
}
// ErrInvalidLoadBalancerMethod is thrown when the specified load balancing method is invalid.
var ErrInvalidLoadBalancerMethod = errors.New("Invalid method, using default")
// Configuration of a provider.
type Configuration struct {
Backends map[string]*Backend `json:"backends,omitempty"`
Frontends map[string]*Frontend `json:"frontends,omitempty"`
}
// ConfigMessage hold configuration information exchanged between parts of traefik.
type ConfigMessage struct {
ProviderName string
Configuration *Configuration
}
// Constraint hold a parsed constraint expresssion
type Constraint struct {
Key string
// MustMatch is true if operator is "==" or false if operator is "!="
MustMatch bool
// TODO: support regex
Regex string
}
// NewConstraint receive a string and return a *Constraint, after checking syntax and parsing the constraint expression
func NewConstraint(exp string) (*Constraint, error) {
sep := ""
constraint := &Constraint{}
if strings.Contains(exp, "==") {
sep = "=="
constraint.MustMatch = true
} else if strings.Contains(exp, "!=") {
sep = "!="
constraint.MustMatch = false
} else {
return nil, errors.New("Constraint expression missing valid operator: '==' or '!='")
}
kv := strings.SplitN(exp, sep, 2)
if len(kv) == 2 {
// At the moment, it only supports tags
if kv[0] != "tag" {
return nil, errors.New("Constraint must be tag-based. Syntax: tag==us-*")
}
constraint.Key = kv[0]
constraint.Regex = kv[1]
return constraint, nil
}
return nil, errors.New("Incorrect constraint expression: " + exp)
}
func (c *Constraint) String() string {
if c.MustMatch {
return c.Key + "==" + c.Regex
}
return c.Key + "!=" + c.Regex
}
// MatchConstraintWithAtLeastOneTag tests a constraint for one single service
func (c *Constraint) MatchConstraintWithAtLeastOneTag(tags []string) bool {
for _, tag := range tags {
if glob.Glob(c.Regex, tag) {
return true
}
}
return false
}