package origin import ( "encoding/json" "io/ioutil" "net/http" "strings" "time" "github.com/cloudflare/golibs/lrucache" ) // StatusPage.io API docs: // https://www.cloudflarestatus.com/api/v2/#incidents-unresolved const ( activeIncidentsURL = "https://yh6f0r4529hb.statuspage.io/api/v2/incidents/unresolved.json" argoTunnelKeyword = "argo tunnel" incidentDetailsPrefix = "https://www.cloudflarestatus.com/incidents/" ) // IncidentLookup is an object that checks for active incidents in // the Cloudflare infrastructure. type IncidentLookup interface { ActiveIncidents() []Incident } // NewIncidentLookup returns a new IncidentLookup instance that caches its // results with a 1-minute TTL. func NewIncidentLookup() IncidentLookup { return newCachedIncidentLookup(fetchActiveIncidents) } type IncidentUpdate struct { Body string } type Incident struct { Name string ID string `json:"id"` Updates []IncidentUpdate `json:"incident_updates"` } type StatusPage struct { Incidents []Incident } func (i Incident) URL() string { return incidentDetailsPrefix + i.ID } func parseStatusPage(data []byte) (*StatusPage, error) { var result StatusPage err := json.Unmarshal(data, &result) return &result, err } func isArgoTunnelIncident(i Incident) bool { if strings.Contains(strings.ToLower(i.Name), argoTunnelKeyword) { return true } for _, u := range i.Updates { if strings.Contains(strings.ToLower(u.Body), argoTunnelKeyword) { return true } } return false } func fetchActiveIncidents() (incidents []Incident) { resp, err := http.Get(activeIncidentsURL) if err != nil { return } defer resp.Body.Close() body, err := ioutil.ReadAll(resp.Body) if err != nil { return } statusPage, err := parseStatusPage(body) if err != nil { return } for _, i := range statusPage.Incidents { if isArgoTunnelIncident(i) { incidents = append(incidents, i) } } return incidents } type cachedIncidentLookup struct { cache *lrucache.LRUCache ttl time.Duration uncachedLookup func() []Incident } func newCachedIncidentLookup(uncachedLookup func() []Incident) *cachedIncidentLookup { return &cachedIncidentLookup{ cache: lrucache.NewLRUCache(1), ttl: time.Minute, uncachedLookup: uncachedLookup, } } // We only need one cache entry. Always use the empty string as its key. const cacheKey = "" func (c *cachedIncidentLookup) ActiveIncidents() []Incident { if cached, ok := c.cache.GetNotStale(cacheKey); ok { if incidents, ok := cached.([]Incident); ok { return incidents } } incidents := c.uncachedLookup() c.cache.Set(cacheKey, incidents, time.Now().Add(c.ttl)) return incidents }