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relaypool.go
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/
relaypool.go
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package main
import (
"context"
"github.com/nbd-wtf/go-nostr"
"github.com/rs/zerolog/log"
"sync"
"time"
)
type RelayPool struct {
pool []*RelayStruct
rootCtx context.Context
}
func NewRelayPool() *RelayPool {
return &RelayPool{
pool: []*RelayStruct{},
rootCtx: context.Background(),
}
}
func (p *RelayPool) UnsubscribeAll() {
for _, relay := range p.pool {
for _, sub := range relay.subs {
log.Debug().Msgf("Unsubscribing from relay %s, ID %s", relay.Url, sub.GetID())
sub.Unsub()
}
relay.subs = []*nostr.Subscription{}
}
}
func (p *RelayPool) Add(relay *RelayStruct) error {
if relay.Enabled {
log.Debug().Msgf("Adding relay %s to pool", relay.Url)
err := relay.Connect(p.rootCtx)
if err != nil {
return err
}
p.pool = append(p.pool, relay)
}
return nil
}
func (p *RelayPool) QuerySync(f *nostr.Filter, c chan *nostr.Event) {
wg := sync.WaitGroup{}
for _, relay := range p.pool {
if relay.Enabled && relay.Read {
wg.Add(1)
go func(r *RelayStruct) {
result, err := r.conn.QuerySync(p.rootCtx, *f)
if err != nil {
log.Error().Msgf("QuerySync error from %s: %s", r.Url, err.Error())
// Try a reconnect, but disable relay if it fails
time.Sleep(time.Second * 2)
relay.Connect(p.rootCtx)
result, err = r.conn.QuerySync(p.rootCtx, *f)
if err != nil {
log.Error().Msgf("QuerySync (retry) error from %s: %s: disabled", r.Url, err.Error())
r.Enabled = false
return
}
}
for i := 0; i < len(result); i++ {
ev := result[i]
ev.SetExtra("relay", r.Url)
c <- ev
}
wg.Done()
}(relay)
}
}
wg.Wait()
close(c)
}
func (p *RelayPool) Subscribe(f *nostr.Filter, c chan *nostr.Event, ac chan *nostr.Event) {
for _, relay := range p.pool {
if relay.Enabled && relay.Read {
go func(r *RelayStruct) {
gotEose := false
sub, err := r.conn.Subscribe(p.rootCtx, []nostr.Filter{*f})
if err != nil {
log.Error().Msgf(err.Error())
return
}
r.subs = append(r.subs, sub)
log.Debug().Msgf("Subscribed to relay %s", r.Url)
defer r.RemoveSub(sub.GetID())
for {
select {
case ev := <-sub.Events:
if ev == nil {
return
}
log.Trace().Msgf("Got event from %s %s", r.Url, ev.ID)
ev.SetExtra("relay", r.Url)
if gotEose {
ac <- ev
} else {
c <- ev
}
case <-sub.EndOfStoredEvents:
log.Debug().Msgf("Got EOSE from %s", r.Url)
gotEose = true
case <-sub.Context.Done():
log.Debug().Msgf("Subscription to relay %s completed: ", r.Url)
return
}
}
}(relay)
}
}
}
func (p *RelayPool) AddAll(relays []*RelayStruct) {
for _, r := range relays {
err := p.Add(r)
if err != nil {
log.Error().Msgf("Could not add %s to pool: %s", r.Url, err.Error())
}
}
}
func (p *RelayPool) RemoveAll() {
p.DisconnectAll()
p.pool = []*RelayStruct{}
}
func (p *RelayPool) DisconnectAll() {
p.UnsubscribeAll()
for _, r := range p.pool {
if r.Enabled {
log.Debug().Msgf("Closing connection to relay %s", r.Url)
err := r.conn.Close()
if err != nil {
log.Err(err)
}
}
}
}
func (p *RelayPool) GetRelayByUrl(url string) *RelayStruct {
for _, r := range p.pool {
if r.Url == url {
return r
}
}
return nil
}