forked from tsuru/tsuru
/
router.go
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/
router.go
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// Copyright 2016 tsuru authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package router provides interfaces that need to be satisfied in order to
// implement a new router on tsuru.
package router
import (
"errors"
"fmt"
"net/url"
"sort"
"strings"
"github.com/tsuru/config"
"github.com/tsuru/tsuru/db"
"github.com/tsuru/tsuru/db/storage"
"github.com/tsuru/tsuru/log"
"gopkg.in/mgo.v2"
"gopkg.in/mgo.v2/bson"
)
type routerFactory func(routerName, configPrefix string) (Router, error)
var (
ErrBackendExists = errors.New("Backend already exists")
ErrBackendNotFound = errors.New("Backend not found")
ErrBackendSwapped = errors.New("Backend is swapped cannot remove")
ErrRouteExists = errors.New("Route already exists")
ErrRouteNotFound = errors.New("Route not found")
ErrCNameExists = errors.New("CName already exists")
ErrCNameNotFound = errors.New("CName not found")
ErrCNameNotAllowed = errors.New("CName as router subdomain not allowed")
)
var routers = make(map[string]routerFactory)
// Register registers a new router.
func Register(name string, r routerFactory) {
routers[name] = r
}
// Get gets the named router from the registry.
func Get(name string) (Router, error) {
prefix := "routers:" + name
routerType, err := config.GetString(prefix + ":type")
if err != nil {
msg := fmt.Sprintf("config key '%s:type' not found", prefix)
if name != "hipache" {
return nil, errors.New(msg)
}
log.Errorf("WARNING: %s, fallback to top level '%s:*' router config", msg, name)
routerType = name
prefix = name
}
factory, ok := routers[routerType]
if !ok {
return nil, fmt.Errorf("unknown router: %q.", routerType)
}
r, err := factory(name, prefix)
if err != nil {
return nil, err
}
return r, nil
}
// Router is the basic interface of this package. It provides methods for
// managing backends and routes. Each backend can have multiple routes.
type Router interface {
AddBackend(name string) error
RemoveBackend(name string) error
AddRoute(name string, address *url.URL) error
AddRoutes(name string, address []*url.URL) error
RemoveRoute(name string, address *url.URL) error
RemoveRoutes(name string, addresses []*url.URL) error
SetCName(cname, name string) error
UnsetCName(cname, name string) error
Addr(name string) (string, error)
// Swap change the router between two backends.
Swap(string, string) error
// Routes returns a list of routes of a backend.
Routes(name string) ([]*url.URL, error)
}
type MessageRouter interface {
StartupMessage() (string, error)
}
type HealthChecker interface {
HealthCheck() error
}
type RouterError struct {
Op string
Err error
}
func (e *RouterError) Error() string {
return fmt.Sprintf("[router %s] %s", e.Op, e.Err)
}
func collection() (*storage.Collection, error) {
conn, err := db.Conn()
if err != nil {
return nil, err
}
return conn.Collection("routers"), nil
}
// Store stores the app name related with the
// router name.
func Store(appName, routerName, kind string) error {
coll, err := collection()
if err != nil {
return err
}
defer coll.Close()
data := map[string]string{
"app": appName,
"router": routerName,
"kind": kind,
}
return coll.Insert(&data)
}
func retrieveRouterData(appName string) (map[string]string, error) {
data := map[string]string{}
coll, err := collection()
if err != nil {
return data, err
}
defer coll.Close()
err = coll.Find(bson.M{"app": appName}).One(&data)
// Avoid need for data migrations, before kind existed we only supported
// hipache as a router so we set is as default here.
if data["kind"] == "" {
data["kind"] = "hipache"
}
return data, err
}
func Retrieve(appName string) (string, error) {
data, err := retrieveRouterData(appName)
if err != nil {
if err == mgo.ErrNotFound {
return "", ErrBackendNotFound
}
return "", err
}
return data["router"], nil
}
func Remove(appName string) error {
coll, err := collection()
if err != nil {
return err
}
defer coll.Close()
return coll.Remove(bson.M{"app": appName})
}
func swapBackendName(backend1, backend2 string) error {
coll, err := collection()
if err != nil {
return err
}
defer coll.Close()
router1, err := Retrieve(backend1)
if err != nil {
return err
}
router2, err := Retrieve(backend2)
if err != nil {
return err
}
update := bson.M{"$set": bson.M{"router": router2}}
err = coll.Update(bson.M{"app": backend1}, update)
if err != nil {
return err
}
update = bson.M{"$set": bson.M{"router": router1}}
return coll.Update(bson.M{"app": backend2}, update)
}
func Swap(r Router, backend1, backend2 string) error {
data1, err := retrieveRouterData(backend1)
if err != nil {
return err
}
data2, err := retrieveRouterData(backend2)
if err != nil {
return err
}
if data1["kind"] != data2["kind"] {
return fmt.Errorf("swap is only allowed between routers of the same kind. %q uses %q, %q uses %q",
backend1, data1["kind"], backend2, data2["kind"])
}
routes1, err := r.Routes(backend1)
if err != nil {
return err
}
routes2, err := r.Routes(backend2)
if err != nil {
return err
}
err = r.AddRoutes(backend1, routes2)
if err != nil {
return err
}
err = r.AddRoutes(backend2, routes1)
if err != nil {
return err
}
err = r.RemoveRoutes(backend1, routes1)
if err != nil {
return err
}
err = r.RemoveRoutes(backend2, routes2)
if err != nil {
return err
}
return swapBackendName(backend1, backend2)
}
type PlanRouter struct {
Name string `json:"name"`
Type string `json:"type"`
}
func List() ([]PlanRouter, error) {
routerConfig, err := config.Get("routers")
var routers map[interface{}]interface{}
if err == nil {
routers, _ = routerConfig.(map[interface{}]interface{})
}
routersList := make([]PlanRouter, 0, len(routers))
var keys []string
for key := range routers {
keys = append(keys, key.(string))
}
topLevelHipacheConfig, _ := config.Get("hipache")
if topLevelHipacheConfig != nil {
keys = append(keys, "hipache")
}
sort.Strings(keys)
for _, value := range keys {
var routerType string
routerProperties, _ := routers[value].(map[interface{}]interface{})
if routerProperties != nil {
routerType, _ = routerProperties["type"].(string)
}
if routerType == "" {
routerType = value
}
routersList = append(routersList, PlanRouter{Name: value, Type: routerType})
}
return routersList, nil
}
// validCName returns true if the cname is not a subdomain of
// the router current domain, false otherwise.
func ValidCName(cname, domain string) bool {
return !strings.HasSuffix(cname, domain)
}
func IsSwapped(name string) (bool, string, error) {
backendName, err := Retrieve(name)
if err != nil {
return false, "", err
}
return name != backendName, backendName, nil
}