works really great now

.gitignore

@@ -1,2 +1,3 @@
 feta
 output/
+feta.sqlite

apihandlers.go

@@ -4,6 +4,8 @@ import "time"
 import "net/http"
 import "encoding/json"
 import "runtime"
+import "fmt"
+import "strings"
 
 import "github.com/gin-gonic/gin"
 
@@ -22,7 +24,7 @@ func (a *FetaAPIServer) instances() []hash {
 		i["successCount"] = v.successCount
 		i["errorCount"] = v.errorCount
 		i["identified"] = v.identified
-		i["status"] = v.status
+		i["status"] = v.Status()
 		i["software"] = "unknown"
 		i["version"] = "unknown"
 		if v.identified {
@@ -35,11 +37,42 @@ func (a *FetaAPIServer) instances() []hash {
 	return resp
 }
 
+func (a *FetaAPIServer) instanceSummary() map[string]int {
+	resp := make(map[string]int)
+	for _, v := range a.feta.manager.listInstances() {
+		v.Lock()
+		resp[fmt.Sprintf("STATUS_%s", v.Status())]++
+		if v.serverImplementationString != "" {
+			//FIXME(sneak) sanitize this to a-z0-9, it is server-provided
+			resp[fmt.Sprintf("SOFTWARE_%s", strings.ToUpper(v.serverImplementationString))]++
+		}
+		v.Unlock()
+	}
+	return resp
+}
+
+func (a *FetaAPIServer) getInstanceListHandler() http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+
+		result := &gin.H{
+			"instances": a.instances(),
+		}
+
+		json, err := json.Marshal(result)
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+
+		w.Header().Set("Content-Type", "application/json")
+		w.Write(json)
+	}
+}
+
 func (a *FetaAPIServer) getIndexHandler() http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
 
 		index := &gin.H{
-			"instances": a.instances(),
 			"server": &gin.H{
 				"now":        time.Now().UTC().Format(time.RFC3339),
 				"uptime":     a.feta.Uptime().String(),
@@ -50,6 +83,7 @@ func (a *FetaAPIServer) getIndexHandler() http.HandlerFunc {
 				"buildarch":  a.feta.buildarch,
 				"builduser":  a.feta.builduser,
 			},
+			"instanceSummary": a.instanceSummary(),
 		}
 
 		json, err := json.Marshal(index)

apiserver.go

@@ -44,7 +44,9 @@ func (a *FetaAPIServer) getRouter() *gin.Engine {
 	r.Use(ginzerolog.Logger("gin"))
 
 	r.GET("/.well-known/healthcheck.json", gin.WrapF(a.getHealthCheckHandler()))
-	r.GET("/", gin.WrapF(a.getIndexHandler()))
+	r.GET("/", func(c *gin.Context) { c.Redirect(http.StatusMovedPermanently, "/feta") })
+	r.GET("/feta", gin.WrapF(a.getIndexHandler()))
+	r.GET("/feta/list/instances", gin.WrapF(a.getInstanceListHandler()))
 
 	return r
 }

dbmodel.go

@@ -0,0 +1,14 @@
+package feta
+
+import "github.com/jinzhu/gorm"
+import _ "github.com/jinzhu/gorm/dialects/sqlite"
+
+type SavedInstance struct {
+	gorm.Model
+	hostname string
+	software string
+}
+
+func (f *FetaProcess) databaseMigrations() {
+	f.db.AutoMigrate(&SavedInstance{})
+}

feta.go

@@ -32,7 +32,7 @@ type FetaProcess struct {
 	manager   *InstanceManager
 	api       *FetaAPIServer
 	db        *gorm.DB
-	startup   *time.Time
+	startup   time.Time
 }
 
 func (f *FetaProcess) identify() {
@@ -72,26 +72,31 @@ func (f *FetaProcess) setupLogging() {
 }
 
 func (f *FetaProcess) Uptime() time.Duration {
-	return time.Since(*f.startup)
+	return time.Since(f.startup)
+}
+
+func (f *FetaProcess) setupDatabase() {
+	var err error
+	f.db, err = gorm.Open("sqlite3", "feta.sqlite")
+
+	if err != nil {
+		panic(err)
+	}
+
+	f.databaseMigrations()
 }
 
 func (f *FetaProcess) RunForever() int {
-	t := time.Now()
+	f.startup = time.Now()
-	f.startup = &t
 
-	var err error
+	f.setupDatabase()
-	f.db, err = gorm.Open("sqlite3", "/feta.sqlite")
-	defer f.db.Close()
 
-	if err != nil {
-		log.Panic().Err(err)
-	}
 	newInstanceHostnameNotifications := make(chan InstanceHostname)
 
 	f.locator = NewInstanceLocator()
 	f.manager = NewInstanceManager()
 	f.api = new(FetaAPIServer)
-	f.api.feta = f // api needs to get to us
+	f.api.feta = f // api needs to get to us to access data
 
 	f.locator.AddInstanceNotificationChannel(newInstanceHostnameNotifications)
 	f.manager.AddInstanceNotificationChannel(newInstanceHostnameNotifications)

instance.go

@@ -9,38 +9,31 @@ import "sync"
 import "time"
 import "errors"
 
-import "github.com/gin-gonic/gin"
+//import "github.com/gin-gonic/gin"
+import "github.com/looplab/fsm"
 import "github.com/rs/zerolog/log"
 
 const NodeInfoSchemaVersionTwoName = "http://nodeinfo.diaspora.software/ns/schema/2.0"
 
-const INSTANCE_NODEINFO_TIMEOUT = time.Second * 5
+const INSTANCE_NODEINFO_TIMEOUT = time.Second * 50
 
-const INSTANCE_HTTP_TIMEOUT = time.Second * 60
+const INSTANCE_HTTP_TIMEOUT = time.Second * 50
 
 const INSTANCE_SPIDER_INTERVAL = time.Second * 60
 
 const INSTANCE_ERROR_INTERVAL = time.Second * 60 * 30
 
-type InstanceImplementation int
+type instanceImplementation int
 
 const (
-	Unknown InstanceImplementation = iota
+	Unknown instanceImplementation = iota
 	Mastodon
 	Pleroma
 )
 
-type InstanceStatus int
+type instanceStatus int
 
-const (
+type instance struct {
-	InstanceStatusNone InstanceStatus = iota
-	InstanceStatusUnknown
-	InstanceStatusAlive
-	InstanceStatusIdentified
-	InstanceStatusFailure
-)
-
-type Instance struct {
 	structLock                 sync.Mutex
 	errorCount                 uint
 	successCount               uint
@@ -48,114 +41,162 @@ type Instance struct {
 	hostname                   string
 	identified                 bool
 	fetching                   bool
-	implementation             InstanceImplementation
+	implementation             instanceImplementation
 	backend                    *InstanceBackend
-	status                     InstanceStatus
+	status                     instanceStatus
 	nextFetch                  time.Time
 	nodeInfoUrl                string
 	serverVersionString        string
 	serverImplementationString string
 	fetchingLock               sync.Mutex
+	fsm                        *fsm.FSM
+	fsmLock                    sync.Mutex
 }
 
-func NewInstance(hostname InstanceHostname) *Instance {
+func NewInstance(options ...func(i *instance)) *instance {
-	self := new(Instance)
+	i := new(instance)
-	self.hostname = string(hostname)
+	i.setNextFetchAfter(1 * time.Second)
-	self.status = InstanceStatusUnknown
+
-	self.setNextFetchAfter(86400 * time.Second)
+	i.fsm = fsm.NewFSM(
-	return self
+		"STATUS_UNKNOWN",
+		fsm.Events{
+			{Name: "BEGIN_NODEINFO_URL_FETCH", Src: []string{"STATUS_UNKNOWN"}, Dst: "FETCHING_NODEINFO_URL"},
+			{Name: "GOT_NODEINFO_URL", Src: []string{"FETCHING_NODEINFO_URL"}, Dst: "PRE_NODEINFO_FETCH"},
+			{Name: "BEGIN_NODEINFO_FETCH", Src: []string{"PRE_NODEINFO_FETCH"}, Dst: "FETCHING_NODEINFO"},
+			{Name: "GOT_NODEINFO", Src: []string{"FETCHING_NODEINFO"}, Dst: "READY_FOR_TOOTFETCH"},
+			{Name: "FETCH_TIME_REACHED", Src: []string{"READY_FOR_TOOTFETCH"}, Dst: "READY_AND_DUE_FETCH"},
+			{Name: "WEIRD_NODE_RESPONSE", Src: []string{"FETCHING_NODEINFO_URL", "PRE_NODEINFO_FETCH", "FETCHING_NODEINFO"}, Dst: "WEIRD_NODE"},
+			{Name: "EARLY_FETCH_ERROR", Src: []string{"FETCHING_NODEINFO_URL", "PRE_NODEINFO_FETCH", "FETCHING_NODEINFO"}, Dst: "EARLY_ERROR"},
+			{Name: "TOOT_FETCH_ERROR", Src: []string{"READY_FOR_TOOTFETCH"}, Dst: "TOOT_FETCH_ERROR"},
+		},
+		fsm.Callbacks{
+			"enter_state": func(e *fsm.Event) { i.fsmEnterState(e) },
+		},
+	)
+
+	for _, opt := range options {
+		opt(i)
+	}
+	return i
 }
 
-func (self *Instance) Lock() {
+func (i *instance) Status() string {
-	self.structLock.Lock()
+	i.fsmLock.Lock()
+	defer i.fsmLock.Unlock()
+	return i.fsm.Current()
 }
 
-func (self *Instance) Unlock() {
+func (i *instance) Event(eventname string) {
-	self.structLock.Unlock()
+	i.fsmLock.Lock()
+	defer i.fsmLock.Unlock()
+	i.fsm.Event(eventname)
 }
 
-func (self *Instance) bumpFetch() {
+func (i *instance) fsmEnterState(e *fsm.Event) {
-	self.Lock()
+	log.Debug().
-	defer self.Unlock()
+		Str("hostname", i.hostname).
-	self.nextFetch = time.Now().Add(100 * time.Second)
+		Str("state", e.Dst).
+		Msg("instance changed state")
 }
 
-func (self *Instance) setNextFetchAfter(d time.Duration) {
+func (i *instance) Lock() {
-	self.Lock()
+	i.structLock.Lock()
-	defer self.Unlock()
-	self.nextFetch = time.Now().Add(d)
 }
 
-func (self *Instance) Fetch() {
+func (i *instance) Unlock() {
-	self.fetchingLock.Lock()
+	i.structLock.Unlock()
-	defer self.fetchingLock.Unlock()
+}
 
-	self.setNextFetchAfter(INSTANCE_ERROR_INTERVAL)
+func (i *instance) bumpFetch() {
+	i.Lock()
+	defer i.Unlock()
+	i.nextFetch = time.Now().Add(100 * time.Second)
+}
 
-	err := self.detectNodeTypeIfNecessary()
+func (i *instance) setNextFetchAfter(d time.Duration) {
+	i.Lock()
+	defer i.Unlock()
+	i.nextFetch = time.Now().Add(d)
+}
+
+func (i *instance) Fetch() {
+	i.fetchingLock.Lock()
+	defer i.fetchingLock.Unlock()
+
+	i.setNextFetchAfter(INSTANCE_ERROR_INTERVAL)
+
+	err := i.detectNodeTypeIfNecessary()
 	if err != nil {
 		log.Debug().
-			Str("hostname", self.hostname).
+			Str("hostname", i.hostname).
 			Err(err).
 			Msg("unable to fetch instance metadata")
 		return
 	}
 
-	self.setNextFetchAfter(INSTANCE_SPIDER_INTERVAL)
+	i.setNextFetchAfter(INSTANCE_SPIDER_INTERVAL)
-	log.Info().Msgf("i (%s) IS NOW READY FOR FETCH", self.hostname)
+	log.Info().Msgf("i (%s) IS NOW READY FOR FETCH", i.hostname)
 }
 
-func (self *Instance) dueForFetch() bool {
+func (i *instance) dueForFetch() bool {
-	self.Lock()
+	// this just checks FSM state, the ticker must update it and do time
-	defer self.Unlock()
+	// calcs
-	if !self.identified {
+	if i.Status() == "READY_AND_DUE_FETCH" {
-		return false
-	}
-	nf := self.nextFetch
-	return nf.Before(time.Now())
-}
-
-func (self *Instance) nodeIdentified() bool {
-	self.Lock()
-	defer self.Unlock()
-	if self.implementation > Unknown {
 		return true
 	}
 	return false
 }
 
-func (self *Instance) detectNodeTypeIfNecessary() error {
+func (i *instance) isNowPastFetchTime() bool {
-	if !self.nodeIdentified() {
+	return time.Now().After(i.nextFetch)
-		return self.fetchNodeInfo()
+}
+
+func (i *instance) Tick() {
+	if i.Status() == "READY_FOR_TOOTFETCH" {
+		if i.isNowPastFetchTime() {
+			i.Event("FETCH_TIME_REACHED")
+		}
+	} else if i.Status() == "STATUS_UNKNOWN" {
+		i.Fetch()
+	}
+}
+
+func (i *instance) nodeIdentified() bool {
+	i.Lock()
+	defer i.Unlock()
+	if i.implementation > Unknown {
+		return true
+	}
+	return false
+}
+
+func (i *instance) detectNodeTypeIfNecessary() error {
+	if !i.nodeIdentified() {
+		return i.fetchNodeInfo()
 	} else {
 		return nil
 	}
 }
 
-func (self *Instance) registerError() {
+func (i *instance) registerError() {
-	self.Lock()
+	i.Lock()
-	defer self.Unlock()
+	defer i.Unlock()
-	self.errorCount++
+	i.errorCount++
 }
 
-func (self *Instance) registerSuccess() {
+func (i *instance) registerSuccess() {
-	self.Lock()
+	i.Lock()
-	defer self.Unlock()
+	defer i.Unlock()
-	self.successCount++
+	i.successCount++
 }
 
-func (self *Instance) APIReport() *gin.H {
+func (i *instance) Up() bool {
-	r := gin.H{}
-	return &r
-}
-
-func (i *Instance) Up() bool {
 	i.Lock()
 	defer i.Unlock()
 	return i.successCount > 0
 }
 
-func (i *Instance) fetchNodeInfoURL() error {
+func (i *instance) fetchNodeInfoURL() error {
 	url := fmt.Sprintf("https://%s/.well-known/nodeinfo", i.hostname)
 	var c = &http.Client{
 		Timeout: INSTANCE_NODEINFO_TIMEOUT,
@@ -166,6 +207,7 @@ func (i *Instance) fetchNodeInfoURL() error {
 		Str("hostname", i.hostname).
 		Msg("fetching nodeinfo reference URL")
 
+	i.Event("BEGIN_NODEINFO_URL_FETCH")
 	resp, err := c.Get(url)
 	if err != nil {
 		log.Debug().
@@ -173,6 +215,7 @@ func (i *Instance) fetchNodeInfoURL() error {
 			Err(err).
 			Msg("unable to fetch nodeinfo, node is down?")
 		i.registerError()
+		i.Event("EARLY_FETCH_ERROR")
 		return err
 	}
 
@@ -185,6 +228,7 @@ func (i *Instance) fetchNodeInfoURL() error {
 			Err(err).
 			Msg("unable to read nodeinfo")
 		i.registerError()
+		i.Event("EARLY_FETCH_ERROR")
 		return err
 	}
 
@@ -196,6 +240,7 @@ func (i *Instance) fetchNodeInfoURL() error {
 			Err(err).
 			Msg("unable to parse nodeinfo, node is weird")
 		i.registerError()
+		i.Event("WEIRD_NODE_RESPONSE")
 		return err
 	}
 
@@ -210,23 +255,25 @@ func (i *Instance) fetchNodeInfoURL() error {
 			i.nodeInfoUrl = item.Href
 			i.Unlock()
 			i.registerSuccess()
+			i.Event("GOT_NODEINFO_URL")
 			return nil
 		}
 		log.Debug().
 			Str("hostname", i.hostname).
 			Str("item-rel", item.Rel).
 			Str("item-href", item.Href).
-			Msg("found key in nodeinfo")
+			Msg("nodeinfo entry")
 	}
 
 	log.Error().
 		Str("hostname", i.hostname).
 		Msg("incomplete nodeinfo")
 	i.registerError()
+	i.Event("WEIRD_NODE_RESPONSE")
 	return errors.New("incomplete nodeinfo")
 }
 
-func (i *Instance) fetchNodeInfo() error {
+func (i *instance) fetchNodeInfo() error {
 	err := i.fetchNodeInfoURL()
 
 	if err != nil {
@@ -243,6 +290,7 @@ func (i *Instance) fetchNodeInfo() error {
 	url := i.nodeInfoUrl
 	i.Unlock()
 
+	i.Event("BEGIN_NODEINFO_FETCH")
 	resp, err := c.Get(url)
 
 	if err != nil {
@@ -251,6 +299,7 @@ func (i *Instance) fetchNodeInfo() error {
 			Err(err).
 			Msgf("unable to fetch nodeinfo data")
 		i.registerError()
+		i.Event("EARLY_FETCH_ERROR")
 		return err
 	}
 
@@ -263,6 +312,7 @@ func (i *Instance) fetchNodeInfo() error {
 			Err(err).
 			Msgf("unable to read nodeinfo data")
 		i.registerError()
+		i.Event("EARLY_FETCH_ERROR")
 		return err
 	}
 
@@ -274,6 +324,7 @@ func (i *Instance) fetchNodeInfo() error {
 			Err(err).
 			Msgf("unable to parse nodeinfo")
 		i.registerError()
+		i.Event("WEIRD_NODE_RESPONSE")
 		return err
 	}
 
@@ -296,9 +347,9 @@ func (i *Instance) fetchNodeInfo() error {
 			Msg("detected server software")
 		i.identified = true
 		i.implementation = Pleroma
-		i.status = InstanceStatusIdentified
 		i.Unlock()
 		i.registerSuccess()
+		i.Event("GOT_NODEINFO")
 		return nil
 	} else if ni.Software.Name == "mastodon" {
 		log.Debug().
@@ -307,9 +358,9 @@ func (i *Instance) fetchNodeInfo() error {
 			Msg("detected server software")
 		i.identified = true
 		i.implementation = Mastodon
-		i.status = InstanceStatusIdentified
 		i.Unlock()
 		i.registerSuccess()
+		i.Event("GOT_NODEINFO")
 		return nil
 	} else {
 		log.Error().
@@ -318,7 +369,8 @@ func (i *Instance) fetchNodeInfo() error {
 			Msg("FIXME unknown server implementation")
 		i.Unlock()
 		i.registerError()
-		return errors.New("FIXME unknown server implementation")
+		i.Event("WEIRD_NODE_RESPONSE")
+		return errors.New("unknown server implementation")
 	}
 }
 
@@ -339,14 +391,14 @@ func (i *Instance) fetchRecentToots() ([]byte, error) {
 */
 
 /*
-func (self *PleromaBackend) fetchRecentToots() ([]byte, error) {
+func (i *PleromaBackend) fetchRecentToots() ([]byte, error) {
 	//url :=
 	//fmt.Sprintf("https://%s/api/statuses/public_and_external_timeline.json?count=100",
 	//i.hostname)
 	return nil, nil
 }
 
-func (self *MastodonBackend) fetchRecentTootsJsonFromMastodon() ([]byte, error) {
+func (i *MastodonBackend) fetchRecentTootsJsonFromMastodon() ([]byte, error) {
 	//url :=
 	//fmt.Sprintf("https://%s/api/v1/timelines/public?limit=40&local=true",
 	//i.hostname)

locator.go

@@ -23,7 +23,7 @@ var INDEX_ERROR_INTERVAL = time.Second * 60 * 10
 
 // LOG_REPORT_INTERVAL defines how long between logging internal
 // stats/reporting for user supervision
-var LOG_REPORT_INTERVAL = time.Second * 60
+var LOG_REPORT_INTERVAL = time.Second * 10
 
 const mastodonIndexUrl = "https://instances.social/list.json?q%5Busers%5D=&q%5Bsearch%5D=&strict=false"
 const pleromaIndexUrl = "https://distsn.org/cgi-bin/distsn-pleroma-instances-api.cgi"
@@ -55,6 +55,22 @@ func (self *InstanceLocator) addInstance(hostname InstanceHostname) {
 	self.reportInstanceVia <- hostname
 }
 
+func (self *InstanceLocator) mastodonIndexRefreshDue() bool {
+	return self.mastodonIndexNextRefresh.Before(time.Now())
+}
+
+func (self *InstanceLocator) durationUntilNextMastodonIndexRefresh() time.Duration {
+	return (time.Duration(-1) * time.Now().Sub(*self.mastodonIndexNextRefresh))
+}
+
+func (self *InstanceLocator) pleromaIndexRefreshDue() bool {
+	return self.pleromaIndexNextRefresh.Before(time.Now())
+}
+
+func (self *InstanceLocator) durationUntilNextPleromaIndexRefresh() time.Duration {
+	return (time.Duration(-1) * time.Now().Sub(*self.pleromaIndexNextRefresh))
+}
+
 func (self *InstanceLocator) Locate() {
 	log.Info().Msg("InstanceLocator starting")
 	x := time.Now()
@@ -66,7 +82,7 @@ func (self *InstanceLocator) Locate() {
 		log.Info().Msg("InstanceLocator tick")
 
 		go func() {
-			if self.pleromaIndexNextRefresh.Before(time.Now()) {
+			if self.pleromaIndexRefreshDue() {
 				if !pleromaSemaphore.TryAcquire(1) {
 					return
 				}
@@ -76,7 +92,7 @@ func (self *InstanceLocator) Locate() {
 		}()
 
 		go func() {
-			if self.mastodonIndexNextRefresh.Before(time.Now()) {
+			if self.mastodonIndexRefreshDue() {
 				if !mastodonSemaphore.TryAcquire(1) {
 					return
 				}
@@ -90,11 +106,11 @@ func (self *InstanceLocator) Locate() {
 		if time.Now().After(x.Add(LOG_REPORT_INTERVAL)) {
 			x = time.Now()
 			log.Debug().
-				Str("nextMastodonIndexFetch", time.Now().Sub(*self.mastodonIndexNextRefresh).String()).
+				Str("nextMastodonIndexRefresh", self.durationUntilNextMastodonIndexRefresh().String()).
-				Send()
+				Msg("refresh countdown")
 			log.Debug().
-				Str("nextMastodonIndexFetch", time.Now().Sub(*self.pleromaIndexNextRefresh).String()).
+				Str("nextPleromaIndexRefresh", self.durationUntilNextPleromaIndexRefresh().String()).
-				Send()
+				Msg("refresh countdown")
 		}
 	}
 

manager.go

@@ -2,13 +2,12 @@ package feta
 
 import "sync"
 import "time"
-import "fmt"
 import "runtime"
 
 //import "github.com/gin-gonic/gin"
 import "github.com/rs/zerolog/log"
 
-const HOST_DISCOVERY_PARALLELISM = 10
+const HOST_DISCOVERY_PARALLELISM = 1
 
 type InstanceBackend interface {
 	//FIXME
@@ -16,7 +15,7 @@ type InstanceBackend interface {
 
 type InstanceManager struct {
 	mu                       sync.Mutex
-	instances                map[InstanceHostname]*Instance
+	instances                map[InstanceHostname]*instance
 	newInstanceNotifications chan InstanceHostname
 	startup                  time.Time
 	hostAdderSemaphore       chan bool
@@ -25,7 +24,7 @@ type InstanceManager struct {
 func NewInstanceManager() *InstanceManager {
 	i := new(InstanceManager)
 	i.hostAdderSemaphore = make(chan bool, HOST_DISCOVERY_PARALLELISM)
-	i.instances = make(map[InstanceHostname]*Instance)
+	i.instances = make(map[InstanceHostname]*instance)
 	return i
 }
 
@@ -76,29 +75,31 @@ func (self *InstanceManager) Manage() {
 		self.receiveNewInstanceHostnames()
 	}()
 	self.startup = time.Now()
+	x := self.startup
 	for {
 		log.Info().Msg("InstanceManager tick")
 		self.managerLoop()
 		time.Sleep(1 * time.Second)
+		if time.Now().After(x.Add(LOG_REPORT_INTERVAL)) {
+			x = time.Now()
+			self.logInstanceReport()
+		}
 	}
 }
 
 func (self *InstanceManager) managerLoop() {
 	self.Lock()
-	il := make([]*Instance, 0)
+	il := make([]*instance, 0)
 	for _, v := range self.instances {
 		il = append(il, v)
 	}
 	self.Unlock()
 
 	for _, v := range il {
-		if v.dueForFetch() {
+		go func(i *instance) {
-			go func(i *Instance) {
+			i.Tick()
-				i.Fetch()
+		}(v)
-			}(v)
-		}
 	}
-
 }
 
 func (self *InstanceManager) hostnameExists(newhn InstanceHostname) bool {
@@ -120,7 +121,9 @@ func (self *InstanceManager) addInstanceByHostname(newhn InstanceHostname) {
 	// this blocks on the channel size, limiting concurrency
 	self.hostAdderSemaphore <- true
 
-	i := NewInstance(newhn)
+	i := NewInstance(func(x *instance) {
+		x.hostname = string(newhn)
+	})
 	// we do node detection under the addLock to avoid thundering
 	// on startup
 	i.detectNodeTypeIfNecessary()
@@ -147,37 +150,19 @@ func (self *InstanceManager) receiveNewInstanceHostnames() {
 
 func (self *InstanceManager) logInstanceReport() {
 	r := self.instanceSummaryReport()
-	log.Info().
+
-		Uint("up", r.up).
+	sublogger := log.With().Logger()
-		Uint("total", r.total).
+
-		Uint("identified", r.identified).
+	for k, v := range r {
+		sublogger = sublogger.With().Uint(k, v).Logger()
+	}
+
+	sublogger.Info().
 		Msg("instance report")
 }
 
-type InstanceSummaryReport struct {
+func (self *InstanceManager) listInstances() []*instance {
-	up         uint
+	var out []*instance
-	identified uint
-	total      uint
-}
-
-func (r *InstanceSummaryReport) String() string {
-	return fmt.Sprintf("up=%d identified=%d total=%d", r.up, r.identified, r.total)
-}
-
-func (self *InstanceManager) NumInstances() uint {
-	return self.instanceSummaryReport().total
-}
-
-type InstanceListReport []*InstanceDetail
-
-type InstanceDetail struct {
-	hostname  string
-	up        bool
-	nextFetch string
-}
-
-func (self *InstanceManager) listInstances() []*Instance {
-	var out []*Instance
 	self.Lock()
 	defer self.Unlock()
 	for _, v := range self.instances {
@@ -186,22 +171,12 @@ func (self *InstanceManager) listInstances() []*Instance {
 	return out
 }
 
-func (self *InstanceManager) instanceSummaryReport() *InstanceSummaryReport {
+func (im *InstanceManager) instanceSummaryReport() map[string]uint {
-	self.Lock()
+	r := make(map[string]uint)
-	defer self.Unlock()
+	for _, v := range im.listInstances() {
-	r := new(InstanceSummaryReport)
+		v.Lock()
-
+		r[v.Status()]++
-	r.total = uint(len(self.instances))
+		v.Unlock()
-
-	for _, elem := range self.instances {
-		if elem.identified == true {
-			r.identified = r.identified + 1
-		}
-
-		if elem.status == InstanceStatusAlive {
-			r.up = r.up + 1
-		}
 	}
-
 	return r
 }