Minor logging changes to coordination packages

coordination/election/election.go

@@ -52,6 +52,7 @@ func (s ElectionState) String() string {
 // Election manages (or witnesses) an election protocol on a given
 // database prefix.
 type Election struct {
+	path     string
 	session  *concurrency.Session
 	election *concurrency.Election
 	self     *pb.Endpoint
@@ -63,6 +64,7 @@ type Election struct {
 func New(session *concurrency.Session, path string, self *pb.Endpoint) *Election {
 	el := concurrency.NewElection(session, path)
 	return &Election{
+		path:     path,
 		session:  session,
 		election: el,
 		self:     self,
@@ -120,10 +122,12 @@ func (e *Election) runOnce(ctx context.Context, data string, op Op) error {
 	}
 
 	// Invoke the leader operation.
+	log.Printf("we are now the leader for %s", e.path)
 	err = op(ctx)
 
 	// Resign, if the session is still valid. Use a standalone
 	// Context to resign even on cancellation.
+	log.Printf("resigning leadership for %s", e.path)
 	rctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
 	rerr := e.election.Resign(rctx)
 	cancel()

coordination/watcher/watcher.go

@@ -2,7 +2,6 @@ package watcher
 
 import (
 	"context"
-	"fmt"
 	"log"
 	"sync"
 	"time"
@@ -131,7 +130,6 @@ func watchOnce(ctx context.Context, cli *clientv3.Client, prefix string, target
 	rch := cli.Watch(ctx, prefix, clientv3.WithPrefix(), clientv3.WithRev(rev))
 	for resp := range rch {
 		for _, ev := range resp.Events {
-			fmt.Printf("%s %q : %q\n", ev.Type, ev.Kv.Key, ev.Kv.Value)
 			key := string(ev.Kv.Key)[plen:]
 			switch ev.Type {
 			case clientv3.EventTypePut: