Fix grpc reconnection and add /info endpoint

main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"context"
+	"encoding/json"
 	"errors"
 	"fmt"
 	"net"
@@ -20,9 +21,33 @@ func indexHandler(w http.ResponseWriter, req *http.Request) {
 	fmt.Fprintf(w, "%s\n%s\n", appName, version.String())
 }
 
+func newInfoHandler(server *server.Server) func(w http.ResponseWriter, req *http.Request) {
+	return func(w http.ResponseWriter, req *http.Request) {
+		if !isReqFromLocalhost(req) {
+			w.WriteHeader(http.StatusForbidden)
+			log.Warnf("Forbidden request for info from %s", requestAddr(req))
+			return
+		}
+
+		info, err := server.FetchManagedChannels(req.Context())
+		if err != nil {
+			w.WriteHeader(http.StatusInternalServerError)
+			fmt.Fprintf(w, "error fetching managed channels: %v\n", err)
+			log.Errorf("Unable to fetch managed channels: %v", err)
+			return
+		}
+
+		err = json.NewEncoder(w).Encode(info)
+		if err != nil {
+			log.Errorf("Unable to encode info: %v", err)
+		}
+	}
+}
+
 func handler(s *server.Server) http.Handler {
 	router := mux.NewRouter().StrictSlash(true)
 	router.Methods("GET").Path("/").Name("index").HandlerFunc(indexHandler)
+	router.Methods("GET").Path("/info").Name("info").HandlerFunc(newInfoHandler(s))
 	server.NewV1Handler(s, router)
 	logRouterConfig(router)
 	return router

server/chanscore.go

@@ -2,7 +2,7 @@ package server
 
 import "time"
 
-// chanActivityScore holds "how much activity" a channel received through some
+// ChanActivityScore holds "how much activity" a channel received through some
 // period of time.
 //
 // The basic equation for determining the "activity" score for a channel is
@@ -12,17 +12,17 @@ import "time"
 // The interpretation for this equation is that the activity score is the
 // percentage of the channel capacity sent through the channel during its
 // entire lifetime.
-type chanActivityScore float64
+type ChanActivityScore float64
 
 // toPercent returns the activity score as a percentage.
-func (s chanActivityScore) toPercent() float64 {
+func (s ChanActivityScore) ToPercent() float64 {
 	return float64(s) * 100
 }
 
 // channelActivity returns the "activity" score for a channel, which measures
 // the total amount of atoms sent through the channel during its lifetime.
 func channelActivity(totalSentAtoms, channelSizeAtoms int64,
-	lifetime time.Duration) chanActivityScore {
+	lifetime time.Duration) ChanActivityScore {
 
 	if lifetime <= 0 {
 		panic("lifetime cannot be <= 0")
@@ -37,5 +37,5 @@ func channelActivity(totalSentAtoms, channelSizeAtoms int64,
 		hours = 1
 	}
 
-	return chanActivityScore(float64(totalSentAtoms) / float64(channelSizeAtoms) / hours)
+	return ChanActivityScore(float64(totalSentAtoms) / float64(channelSizeAtoms) / hours)
 }

server/chanscore_test.go

@@ -14,7 +14,7 @@ func TestChanActivityScore(t *testing.T) {
 		sent int64
 		size int64
 		life time.Duration
-		want chanActivityScore
+		want ChanActivityScore
 	}{{
 		name: "1 atom sent through 1 DCR chan within 1 hour",
 		sent: 1,