Try to reduce memory usage

actor.go

@@ -129,7 +129,7 @@ func (a *Actor) PostArticle(url string) error {
 		return errors.New("failed to decode fetched article")
 	}
 	create["object"] = article
-	go a.sendToFollowers(create)
+	a.sendToFollowers(&create)
 	// Boost article if it contains "inReplyTo"
 	if article["inReplyTo"] != nil {
 		announce := make(map[string]interface{})
@@ -140,7 +140,7 @@ func (a *Actor) PostArticle(url string) error {
 		announce["actor"] = a.iri
 		announce["to"] = []string{"https://www.w3.org/ns/activitystreams#Public"}
 		announce["published"] = article["published"]
-		go a.sendToFollowers(announce)
+		a.sendToFollowers(&announce)
 	}
 	// Send update event if it contains "updated" and "updated" != "published"
 	if article["updated"] != nil && article["published"] != nil && article["updated"] != article["published"] {
@@ -149,7 +149,7 @@ func (a *Actor) PostArticle(url string) error {
 		update["type"] = "Update"
 		update["object"] = url
 		update["actor"] = a.iri
-		go a.sendToFollowers(update)
+		a.sendToFollowers(&update)
 	}
 	return nil
 }
@@ -157,8 +157,8 @@ func (a *Actor) PostArticle(url string) error {
 // signedHTTPPost performs an HTTP post on behalf of Actor with the
 // request-target, date, host and digest headers signed
 // with the actor's private key.
-func (a *Actor) signedHTTPPost(content map[string]interface{}, to string) (err error) {
-	b, err := json.Marshal(content)
+func (a *Actor) signedHTTPPost(content *map[string]interface{}, to string) (err error) {
+	b, err := json.Marshal(*content)
 	if err != nil {
 		return
 	}
@@ -210,7 +210,7 @@ func (a *Actor) RemoveFollower(iri string) error {
 }
 
 // send to followers sends a batch of http posts to each one of the followers
-func (a *Actor) sendToFollowers(activity map[string]interface{}) {
+func (a *Actor) sendToFollowers(activity *map[string]interface{}) {
 	recipients := make([]string, len(a.followers))
 	i := 0
 	for _, inbox := range a.followers {
@@ -229,12 +229,12 @@ func (a *Actor) newID() (hash string, url string) {
 }
 
 // Accept a follow request
-func (a *Actor) Accept(follow map[string]interface{}) {
+func (a *Actor) Accept(follow *map[string]interface{}) {
 	// it's a follow, write it down
-	newFollower := follow["actor"].(string)
+	newFollower := (*follow)["actor"].(string)
 	fmt.Println("New follow request:", newFollower)
 	// check we aren't following ourselves
-	if newFollower == follow["object"] {
+	if newFollower == (*follow)["object"] {
 		// actor and object are equal
 		return
 	}
@@ -247,21 +247,19 @@ func (a *Actor) Accept(follow map[string]interface{}) {
 	// Add or update follower
 	_ = a.NewFollower(newFollower, follower.inbox)
 	// remove @context from the inner activity
-	delete(follow, "@context")
+	delete(*follow, "@context")
 	accept := make(map[string]interface{})
 	accept["@context"] = "https://www.w3.org/ns/activitystreams"
-	accept["to"] = follow["actor"]
+	accept["to"] = (*follow)["actor"]
 	_, accept["id"] = a.newID()
 	accept["actor"] = a.iri
-	accept["object"] = follow
+	accept["object"] = *follow
 	accept["type"] = "Accept"
-	go func() {
-		err = a.signedHTTPPost(accept, follower.inbox)
-		if err != nil {
-			fmt.Println("Failed to accept:", follower.iri)
-			fmt.Println(err.Error())
-		} else {
-			fmt.Println("Accepted:", follower.iri)
-		}
-	}()
+	err = a.signedHTTPPost(&accept, follower.inbox)
+	if err != nil {
+		fmt.Println("Failed to accept:", follower.iri)
+		fmt.Println(err.Error())
+	} else {
+		fmt.Println("Accepted:", follower.iri)
+	}
 }

feed.go

@@ -7,7 +7,7 @@ import (
 	"net/http"
 )
 
-func allFeedItems(url string) ([]string, error) {
+func allFeedItems(url string) (*[]string, error) {
 	jsonFeed := &struct {
 		Items []struct {
 			Url string `json:"url"`
@@ -30,5 +30,5 @@ func allFeedItems(url string) ([]string, error) {
 	for _, item := range jsonFeed.Items {
 		allUrls = append(allUrls, item.Url)
 	}
-	return allUrls, nil
+	return &allUrls, nil
 }

http.go

@@ -27,7 +27,7 @@ func Serve() {
 				continue
 			}
 			// Post or update latest 5 article
-			for _, article := range articles[0:int(math.Min(float64(len(articles)-1), 4))] {
+			for _, article := range (*articles)[0:int(math.Min(float64(len(*articles)-1), 4))] {
 				err = actor.PostArticle(article)
 				if err != nil {
 					fmt.Println("Posting", article, "failed")
@@ -79,7 +79,7 @@ func Serve() {
 		}
 		switch activity["type"] {
 		case "Follow":
-			actor.Accept(activity)
+			actor.Accept(&activity)
 		case "Undo":
 			{
 				if object, ok := activity["object"].(map[string]interface{}); ok {

remoteActor.go

@@ -17,11 +17,11 @@ func NewRemoteActor(iri string) (RemoteActor, error) {
 	if err != nil {
 		return RemoteActor{}, err
 	}
-	inbox := info["inbox"].(string)
+	inbox := (*info)["inbox"].(string)
 	var endpoints map[string]interface{}
 	var sharedInbox string
-	if info["endpoints"] != nil {
-		endpoints = info["endpoints"].(map[string]interface{})
+	if (*info)["endpoints"] != nil {
+		endpoints = (*info)["endpoints"].(map[string]interface{})
 		if val, ok := endpoints["sharedInbox"]; ok {
 			sharedInbox = val.(string)
 		}
@@ -33,7 +33,7 @@ func NewRemoteActor(iri string) (RemoteActor, error) {
 	}, err
 }
 
-func get(iri string) (info map[string]interface{}, err error) {
+func get(iri string) (info *map[string]interface{}, err error) {
 	buf := new(bytes.Buffer)
 	req, err := http.NewRequest("GET", iri, buf)
 	if err != nil {
@@ -49,11 +49,11 @@ func get(iri string) (info map[string]interface{}, err error) {
 	if !isSuccess(resp.StatusCode) {
 		return
 	}
-	var e interface{}
+	var e map[string]interface{}
 	err = json.NewDecoder(resp.Body).Decode(&e)
 	if err != nil {
 		return
 	}
-	info = e.(map[string]interface{})
+	info = &e
 	return
 }