package types import ( "encoding" "errors" "fmt" "github.com/docker/libkv/store" "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"` } // 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"` Sticky bool `json:"sticky,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"` } // Route holds route configuration. type Route struct { Rule string `json:"rule,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"` Priority int `json:"priority"` } // 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 } var _ encoding.TextUnmarshaler = (*Constraint)(nil) // UnmarshalText define how unmarshal in TOML parsing func (c *Constraint) UnmarshalText(text []byte) error { constraint, err := NewConstraint(string(text)) if err != nil { return err } c.Key = constraint.Key c.MustMatch = constraint.MustMatch c.Regex = constraint.Regex return nil } var _ encoding.TextMarshaler = (*Constraint)(nil) // MarshalText encodes the receiver into UTF-8-encoded text and returns the result. func (c *Constraint) MarshalText() (text []byte, err error) { return []byte(c.String()), nil } // 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 } //Set []*Constraint func (cs *Constraints) Set(str string) error { exps := strings.Split(str, ",") if len(exps) == 0 { return errors.New("Bad Constraint format: " + str) } for _, exp := range exps { constraint, err := NewConstraint(exp) if err != nil { return err } *cs = append(*cs, constraint) } return nil } // Constraints holds a Constraint parser type Constraints []*Constraint //Get []*Constraint func (cs *Constraints) Get() interface{} { return []*Constraint(*cs) } //String returns []*Constraint in string func (cs *Constraints) String() string { return fmt.Sprintf("%+v", *cs) } //SetValue sets []*Constraint into the parser func (cs *Constraints) SetValue(val interface{}) { *cs = Constraints(val.(Constraints)) } // Type exports the Constraints type as a string func (cs *Constraints) Type() string { return fmt.Sprint("constraint") } // Store holds KV store cluster config type Store struct { store.Store Prefix string // like this "prefix" (without the /) } // Cluster holds cluster config type Cluster struct { Node string `description:"Node name"` Store *Store } // Auth holds authentication configuration (BASIC, DIGEST, users) type Auth struct { Basic *Basic Digest *Digest } // Users authentication users type Users []string // Basic HTTP basic authentication type Basic struct { Users `mapstructure:","` } // Digest HTTP authentication type Digest struct { Users `mapstructure:","` } // CanonicalDomain returns a lower case domain with trim space func CanonicalDomain(domain string) string { return strings.ToLower(strings.TrimSpace(domain)) } // Statistics provides options for monitoring request and response stats type Statistics struct { RecentErrors int `description:"Number of recent errors logged"` }