some stringifiers.

filter.go

@@ -1,6 +1,7 @@
 package nostr
 
 import (
+	"encoding/json"
 	"time"
 
 	"golang.org/x/exp/slices"
@@ -20,6 +21,11 @@ type Filter struct {
 
 type TagMap map[string][]string
 
+func (eff Filters) String() string {
+	j, _ := json.Marshal(eff)
+	return string(j)
+}
+
 func (eff Filters) Match(event *Event) bool {
 	for _, filter := range eff {
 		if filter.Matches(event) {
@@ -29,6 +35,11 @@ func (eff Filters) Match(event *Event) bool {
 	return false
 }
 
+func (ef Filter) String() string {
+	j, _ := json.Marshal(ef)
+	return string(j)
+}
+
 func (ef Filter) Matches(event *Event) bool {
 	if event == nil {
 		return false

relay.go

@@ -51,6 +51,10 @@ func RelayConnect(url string) (*Relay, error) {
 	return r, err
 }
 
+func (r *Relay) String() string {
+	return r.URL
+}
+
 func (r *Relay) Connect() error {
 	if r.URL == "" {
 		return fmt.Errorf("invalid relay URL '%s'", r.URL)