tokenhub.gno

 1package tokenhub
 2
 3import (
 4	"chain/runtime"
 5
 6	"gno.land/p/demo/tokens/grc20"
 7	"gno.land/p/nt/fqname"
 8	"gno.land/r/demo/defi/grc20reg"
 9
10	"gno.land/p/demo/tokens/grc1155"
11	"gno.land/p/demo/tokens/grc721"
12	"gno.land/p/nt/avl"
13
14	"gno.land/r/leon/hor"
15)
16
17type GRC1155TokenInfo struct {
18	Collection grc1155.MultiTokenGetter
19	TokenID    string
20}
21
22var (
23	registeredTokens = avl.NewTree() // rlmPath[.slug] -> *grc20.Token
24	registeredNFTs   = avl.NewTree() // rlmPath[.slug] -> grc721.NFTGetter
25	registeredMTs    = avl.NewTree() // rlmPath[.slug] -> GRC1155TokenInfo
26)
27
28const pageSize = 10
29
30func init() {
31	hor.Register(cross, "Token Hub", "Registry for tokens and NFTs on gno.land")
32}
33
34// RegisterToken is a function that uses gno.land/r/demo/defi/grc20reg to register a token
35// It uses the slug to construct a key and then registers the token in the registry
36// The logic is the same as in grc20reg, but it's done here so the key path is callers pkgpath and not of this realm
37// After doing so, the token hub realm uses grc20reg's registry as a read-only avl.Tree
38//
39// Note: register token returns the key path that can be used to retrieve the token
40func RegisterToken(cur realm, token *grc20.Token, slug string) string {
41	rlmPath := runtime.PreviousRealm().PkgPath()
42	key := fqname.Construct(rlmPath, slug)
43
44	grc20reg.Register(cross, token, key)
45
46	return fqname.Construct(runtime.CurrentRealm().PkgPath(), key)
47}
48
49// RegisterNFT is a function that registers an NFT in an avl.Tree
50func RegisterNFT(cur realm, nftGetter grc721.NFTGetter, collection string, tokenId string) error {
51	nft := nftGetter()
52	_, ok := nft.(grc721.IGRC721CollectionMetadata)
53	if !ok {
54		return ErrNFTNotMetadata
55	}
56
57	nftOwner, err := nft.OwnerOf(grc721.TokenID(tokenId))
58
59	if err != nil {
60		return err
61	}
62	if !nftOwner.IsValid() {
63		return ErrNFTtokIDNotExists
64	}
65
66	rlmPath := runtime.PreviousRealm().PkgPath()
67	key := rlmPath + "." + collection + "." + tokenId
68
69	if registeredNFTs.Has(key) {
70		return ErrNFTAlreadyRegistered
71	}
72
73	registeredNFTs.Set(key, nftGetter)
74	return nil
75}
76
77// RegisterMultiToken is a function that registers a multi-token in an avl.Tree
78// The avl.Tree value is a struct defined in this realm. It contains not only the getter (like other token types) but also the tokenID
79func RegisterMultiToken(cur realm, mtGetter grc1155.MultiTokenGetter, tokenID string) error {
80	rlmPath := runtime.PreviousRealm().PkgPath()
81	key := rlmPath + "." + tokenID
82
83	if registeredMTs.Has(key) {
84		return ErrMTAlreadyRegistered
85	}
86
87	registeredMTs.Set(key, GRC1155TokenInfo{
88		Collection: mtGetter,
89		TokenID:    tokenID,
90	})
91	return nil
92}