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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,93 @@ | ||
| package p2p | ||
|
|
||
| import ( | ||
| "context" | ||
| "errors" | ||
| "path" | ||
|
|
||
| "github.com/libp2p/go-libp2p-core/host" | ||
| "github.com/libp2p/go-libp2p-core/peer" | ||
| pubsub "github.com/libp2p/go-libp2p-pubsub" | ||
| namesys "github.com/libp2p/go-libp2p-pubsub-router" | ||
| record "github.com/libp2p/go-libp2p-record" | ||
| "github.com/multiverse-vcs/go-multiverse/data" | ||
| ) | ||
|
|
||
| // Namespace is the pubsub topic namespace. | ||
| const Namespace = "multiverse" | ||
|
|
||
| // Pubsub allows subcribing to topics. | ||
| type Pubsub struct { | ||
| store *namesys.PubsubValueStore | ||
| } | ||
|
|
||
| // TopicForPeerID returns the topic name for the given peer id. | ||
| func TopicForPeerID(id peer.ID) string { | ||
| return path.Join("/", Namespace, string(id)) | ||
| } | ||
|
|
||
| // NewPubsub returns a new pubsub router. | ||
| func NewPubsub(ctx context.Context, host host.Host) (*Pubsub, error) { | ||
| sub, err := pubsub.NewGossipSub(ctx, host) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| store, err := namesys.NewPubsubValueStore(ctx, host, sub, validator{}) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return &Pubsub{ | ||
| store: store, | ||
| }, nil | ||
| } | ||
|
|
||
| func (p *Pubsub) SearchAuthor(ctx context.Context, id peer.ID) (*data.Author, error) { | ||
| out, err := p.store.SearchValue(ctx, TopicForPeerID(id)) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return data.AuthorFromCBOR(<-out) | ||
| } | ||
|
|
||
| func (p *Pubsub) GetAuthor(ctx context.Context, id peer.ID) (*data.Author, error) { | ||
| value, err := p.store.GetValue(ctx, TopicForPeerID(id)) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return data.AuthorFromCBOR(value) | ||
| } | ||
|
|
||
| func (p *Pubsub) PutAuthor(ctx context.Context, id peer.ID, author *data.Author) error { | ||
| node, err := author.Node() | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| return p.store.PutValue(ctx, TopicForPeerID(id), node.RawData()) | ||
| } | ||
|
|
||
| type validator struct{} | ||
|
|
||
| func (v validator) Validate(key string, value []byte) error { | ||
| ns, _, err := record.SplitKey(key) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| if ns != Namespace { | ||
| return errors.New("invalid namespace") | ||
| } | ||
|
|
||
| // TODO unmarshal author from value | ||
| // TODO validate signature of author | ||
| return nil | ||
| } | ||
|
|
||
| func (v validator) Select(key string, vals [][]byte) (int, error) { | ||
| // TODO compare author sequence numbers | ||
| return 0, nil | ||
| } |
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