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instancediscoverer.go
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/
instancediscoverer.go
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package instancediscoverer
import (
"code.cloudfoundry.org/lager"
"errors"
"fmt"
"github.com/cloudfoundry-community/go-cfclient"
"net/url"
)
//go:generate go run github.com/maxbrunsfeld/counterfeiter/v6 -generate
//counterfeiter:generate . CFAppDiscoverer
type CFAppDiscoverer interface {
GetSpaceAppByName(appName string) (cfclient.App, error)
GetAppRoutesByName(appName string) ([]cfclient.Route, error)
GetAppRouteURLsByName(appName string) ([]*url.URL, error)
Org() cfclient.Org
Space() cfclient.Space
MyName() string
Ping() error
}
type cfAppDiscoverer struct {
DiscoveryScope AppDiscoveryScope
client DiscovererClient
logger lager.Logger
org cfclient.Org
space cfclient.Space
thisAppName string
}
type Config struct {
ClientConfig *cfclient.Config
Client DiscovererClient
Logger lager.Logger
DiscoveryScope AppDiscoveryScope
ThisAppName string
}
type AppDiscoveryScope struct {
SpaceName string
SpaceID string
OrganizationName string
OrganizationID string
AppNames []string
}
func New(cfg Config) (CFAppDiscoverer, error) {
if cfg.Logger == nil {
cfg.Logger = lager.NewLogger("app-discovery")
}
if cfg.Client == nil {
if cfg.ClientConfig == nil {
return nil, fmt.Errorf("appdiscoverer.New: must supply cfclient.Config")
}
cf, err := cfclient.NewClient(cfg.ClientConfig)
if err != nil {
return nil, err
}
cfg.Client = cf
}
org, err := cfg.Client.GetOrgByGuid(cfg.DiscoveryScope.OrganizationID)
if err != nil {
return nil, err
}
space, err := cfg.Client.GetSpaceByGuid(cfg.DiscoveryScope.SpaceID)
if err != nil {
return nil, err
}
discoverer := &cfAppDiscoverer{
org: org,
space: space,
client: cfg.Client,
logger: cfg.Logger,
DiscoveryScope: cfg.DiscoveryScope,
thisAppName: cfg.ThisAppName,
}
return discoverer, nil
}
var AccessDeniedError = errors.New("access denied")
func (d *cfAppDiscoverer) GetSpaceAppByName(appName string) (cfclient.App, error) {
if !d.appAccessAllowed(appName) {
return cfclient.App{}, AccessDeniedError
}
app, err := d.client.AppByName(appName, d.space.Guid, d.org.Guid)
if err != nil {
return cfclient.App{}, err
}
return app, nil
}
func (d *cfAppDiscoverer) GetAppRoutesByName(appName string) ([]cfclient.Route, error) {
app, err := d.GetSpaceAppByName(appName)
if err != nil {
return nil, err
}
routes, err := d.client.GetAppRoutes(app.Guid)
if err != nil {
return nil, err
}
return routes, nil
}
func (d *cfAppDiscoverer) GetAppRouteURLsByName(appName string) ([]*url.URL, error) {
appRoutes, err := d.GetAppRoutesByName(appName)
var appURLs []*url.URL
if err != nil {
return nil, err
}
for _, route := range appRoutes {
domain, err := d.getRouteDomain(route)
if err != nil {
continue
}
routeURL := &url.URL{
Host: fmt.Sprintf("%s.%s", route.Host, domain.Name),
Scheme: "https",
}
appURLs = append(appURLs, routeURL)
}
return appURLs, nil
}
func (d *cfAppDiscoverer) getRouteDomain(route cfclient.Route) (cfclient.Domain, error) {
return d.client.GetDomainByGuid(route.DomainGuid)
}
func (d *cfAppDiscoverer) Org() cfclient.Org {
return d.org
}
func (d *cfAppDiscoverer) Space() cfclient.Space {
return d.space
}
func (d *cfAppDiscoverer) MyName() string {
return d.thisAppName
}
func (d *cfAppDiscoverer) Ping() error {
app, err := d.client.AppByName(d.thisAppName, d.space.Guid, d.org.Guid)
if err != nil {
return err
}
if app.Name != d.thisAppName {
return fmt.Errorf("app name did not match")
}
return nil
}
func (d *cfAppDiscoverer) appAccessAllowed(appName string) bool {
for _, name := range d.DiscoveryScope.AppNames {
if name == appName {
return true
}
}
return false
}