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api.go
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api.go
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package routingapi
import (
"context"
"fmt"
"time"
"code.cloudfoundry.org/route-registrar/config"
"golang.org/x/oauth2"
"code.cloudfoundry.org/routing-api/models"
"code.cloudfoundry.org/lager/v3"
routing_api "code.cloudfoundry.org/routing-api"
)
type RoutingAPI struct {
logger lager.Logger
uaaClient uaaClient
apiClient routing_api.Client
routerGroupGUID map[string]string
routingAPIMaxTTL time.Duration
}
//go:generate counterfeiter . uaaClient
type uaaClient interface {
FetchToken(context.Context, bool) (*oauth2.Token, error)
}
func NewRoutingAPI(logger lager.Logger, uaaClient uaaClient, apiClient routing_api.Client, routingAPIMaxTTL time.Duration) *RoutingAPI {
return &RoutingAPI{
uaaClient: uaaClient,
apiClient: apiClient,
logger: logger,
routerGroupGUID: make(map[string]string),
routingAPIMaxTTL: routingAPIMaxTTL,
}
}
func (r *RoutingAPI) refreshToken() error {
r.logger.Info("refresh-token")
token, err := r.uaaClient.FetchToken(context.Background(), false)
if err != nil {
r.logger.Error("token-error", err)
return err
}
r.logger.Debug("set-token", lager.Data{"token": token})
r.apiClient.SetToken(token.AccessToken)
return nil
}
func (r *RoutingAPI) getRouterGroupGUID(name string) (string, error) {
guid, exists := r.routerGroupGUID[name]
if exists {
return guid, nil
}
routerGroup, err := r.apiClient.RouterGroupWithName(name)
if err != nil {
return "", err
}
if routerGroup.Guid == "" {
return "", fmt.Errorf("Router group '%s' not found", name)
}
r.logger.Info("Mapped new router group", lager.Data{
"router_group": name,
"guid": routerGroup.Guid})
r.routerGroupGUID[name] = routerGroup.Guid
return routerGroup.Guid, nil
}
func (r *RoutingAPI) makeTcpRouteMapping(route config.Route) (models.TcpRouteMapping, error) {
routerGroupGUID, err := r.getRouterGroupGUID(route.RouterGroup)
if err != nil {
return models.TcpRouteMapping{}, err
}
r.logger.Info("Creating mapping", lager.Data{})
return models.NewTcpRouteMapping(
routerGroupGUID,
uint16(*route.ExternalPort),
route.Host,
uint16(*route.Port),
0,
"",
nilIfEmpty(&route.ServerCertDomainSAN),
calculateTTL(route.RegistrationInterval, r.routingAPIMaxTTL),
models.ModificationTag{},
), nil
}
const TTL_BUFFER float64 = 2.1
// add a buffer to the registration interval so that it is not the same as the
// TTL
func calculateTTL(requestedTTL, maxTTL time.Duration) int {
ttl := time.Duration(float64(requestedTTL) * TTL_BUFFER)
if ttl > maxTTL {
return int(maxTTL.Seconds())
}
// ensure a bare minimum of TTL in case registration interval is <1s
if int(ttl.Seconds()) < 1 {
return 1
}
return int(ttl.Seconds())
}
func nilIfEmpty(str *string) *string {
if str == nil || *str == "" {
return nil
}
return str
}
func (r *RoutingAPI) RegisterRoute(route config.Route) error {
err := r.refreshToken()
if err != nil {
r.logger.Error("Failed to refresh UAA token", err)
return err
}
routeMapping, err := r.makeTcpRouteMapping(route)
if err != nil {
r.logger.Error("Failed to make route mapping", err, lager.Data{"route": route})
return err
}
err = r.apiClient.UpsertTcpRouteMappings([]models.TcpRouteMapping{
routeMapping})
if err != nil {
r.logger.Error("Failed to upsert route mapping", err, lager.Data{"route-mapping": routeMapping})
return err
}
r.logger.Info("Upserted route", lager.Data{"route-mapping": routeMapping})
return nil
}
func (r *RoutingAPI) UnregisterRoute(route config.Route) error {
err := r.refreshToken()
if err != nil {
r.logger.Error("Failed to refresh UAA token", err)
return err
}
routeMapping, err := r.makeTcpRouteMapping(route)
if err != nil {
r.logger.Error("Failed to make route mapping", err, lager.Data{"route": route})
return err
}
err = r.apiClient.DeleteTcpRouteMappings([]models.TcpRouteMapping{routeMapping})
if err != nil {
r.logger.Error("Failed to delete route mapping", err, lager.Data{"route-mapping": routeMapping})
return err
}
r.logger.Info("Deleted route", lager.Data{"route-mapping": routeMapping})
return nil
}