mirror of
https://github.com/status-im/go-waku.git
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44 lines
1.2 KiB
Go
44 lines
1.2 KiB
Go
// Waku Relay module. Thin layer on top of GossipSub.
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//
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// See https://github.com/vacp2p/specs/blob/master/specs/waku/v2/waku-relay.md
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// for spec.
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package protocol
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import (
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"context"
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"crypto/sha256"
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"github.com/libp2p/go-libp2p-core/host"
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libp2pProtocol "github.com/libp2p/go-libp2p-core/protocol"
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pubsub "github.com/libp2p/go-libp2p-pubsub"
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pubsub_pb "github.com/libp2p/go-libp2p-pubsub/pb"
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)
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const WakuRelayProtocol = libp2pProtocol.ID("/vac/waku/relay/2.0.0-beta2")
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type WakuRelay struct {
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p *pubsub.PubSub
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}
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// Once https://github.com/status-im/nim-waku/issues/420 is fixed, implement a custom messageIdFn
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func msgIdFn(pmsg *pubsub_pb.Message) string {
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hash := sha256.Sum256(pmsg.Data)
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return string(hash[:])
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}
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func NewWakuRelay(ctx context.Context, h host.Host, opts ...pubsub.Option) (*pubsub.PubSub, error) {
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opts = append(opts, pubsub.WithMessageSignaturePolicy(pubsub.StrictNoSign))
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opts = append(opts, pubsub.WithNoAuthor())
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opts = append(opts, pubsub.WithMessageIdFn(msgIdFn))
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gossipSub, err := pubsub.NewGossipSub(ctx, h, []libp2pProtocol.ID{WakuRelayProtocol}, opts...)
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if err != nil {
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return nil, err
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}
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w := new(WakuRelay)
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w.p = gossipSub
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return gossipSub, nil
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}
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