oc-discovery/daemons/node/indexer/service.go

package indexer

import (
	"context"
	"oc-discovery/daemons/node/common"
	"sync"

	oclib "cloud.o-forge.io/core/oc-lib"
	dht "github.com/libp2p/go-libp2p-kad-dht"
	pubsub "github.com/libp2p/go-libp2p-pubsub"
	record "github.com/libp2p/go-libp2p-record"
	"github.com/libp2p/go-libp2p/core/host"
	"github.com/libp2p/go-libp2p/core/peer"
)

// Index Record is the model for the specialized registry of node connected to Indexer
type IndexerService struct {
	*common.LongLivedStreamRecordedService[PeerRecord]
	PS              *pubsub.PubSub
	DHT             *dht.IpfsDHT
	isStrictIndexer bool
	mu              sync.RWMutex
	DisposedPeers   map[peer.ID]*common.TopicNodeActivityPub

	SeenQueries map[string]bool
	SeenMU      sync.Mutex
}

// if a pubsub is given... indexer is also an active oc-node. If not... your a strict indexer
func NewIndexerService(h host.Host, ps *pubsub.PubSub, maxNode int) *IndexerService {
	logger := oclib.GetLogger()
	logger.Info().Msg("open indexer mode...")
	var err error
	ix := &IndexerService{
		LongLivedStreamRecordedService: common.NewStreamRecordedService[PeerRecord](h, maxNode, false),
		isStrictIndexer:                ps == nil,
	}
	if ps == nil { // generate your fresh gossip for the flow of killed node... EVERYBODY should know !
		ps, err = pubsub.NewGossipSub(context.Background(), ix.Host)
		if err != nil {
			panic(err) // can't run your indexer without a propalgation pubsub, of state of node.
		}
	}
	ix.PS = ps
	// later TODO : all indexer laucnh a private replica of them self. DEV OPS
	if ix.isStrictIndexer {
		logger.Info().Msg("connect to indexers as strict indexer...")
		common.ConnectToIndexers(h, 0, 5, ix.Host.ID()) // TODO : make var to change how many indexers are allowed.
		logger.Info().Msg("subscribe to node activity as strict indexer...")

		logger.Info().Msg("subscribe to decentralized search flow as strict indexer...")
		ix.SubscribeToSearch(ix.PS, nil)
	}
	if ix.DHT, err = dht.New(
		context.Background(),
		ix.Host,
		dht.Mode(dht.ModeServer),
		dht.Validator(record.NamespacedValidator{
			"node": PeerRecordValidator{},
		}),
	); err != nil {
		return nil
	}
	ix.initNodeHandler() // then listen up on every protocol expected
	return ix
}

func (ix *IndexerService) Close() {
	ix.DHT.Close()
	ix.PS.UnregisterTopicValidator(common.TopicPubSubSearch)
	for _, s := range ix.StreamRecords {
		for _, ss := range s {
			ss.HeartbeatStream.Stream.Close()
		}
	}
}