usdc.gno

 1package usdc
 2
 3import (
 4	"strings"
 5
 6	"gno.land/p/demo/tokens/grc20"
 7	ownable "gno.land/p/nt/ownable/v0"
 8	ufmt "gno.land/p/nt/ufmt/v0"
 9
10	"gno.land/r/demo/defi/grc20reg"
11)
12
13var (
14	token         *grc20.Token
15	privateLedger *grc20.PrivateLedger
16	userTeller    grc20.Teller
17
18	owner = ownable.NewWithAddress("g17290cwvmrapvp869xfnhhawa8sm9edpufzat7d") // ADMIN
19)
20
21func init(cur realm) {
22	token, privateLedger = grc20.NewToken(0, cur, "Usd Coin", "USDC", 6)
23	userTeller = token.CallerTeller()
24
25	privateLedger.Mint(owner.Owner(), 70_000_000_000_000_000)
26	grc20reg.Register(cross(cur), token, "")
27}
28
29func TotalSupply() int64 {
30	return userTeller.TotalSupply()
31}
32
33func BalanceOf(owner address) int64 {
34	return userTeller.BalanceOf(owner)
35}
36
37func Allowance(owner, spender address) int64 {
38	return userTeller.Allowance(owner, spender)
39}
40
41func Transfer(cur realm, to address, amount int64) {
42	checkErr(userTeller.Transfer(0, cur, to, amount))
43}
44
45func Approve(cur realm, spender address, amount int64) {
46	checkErr(userTeller.Approve(0, cur, spender, amount))
47}
48
49func TransferFrom(cur realm, from, to address, amount int64) {
50	checkErr(userTeller.TransferFrom(0, cur, from, to, amount))
51}
52
53func Mint(cur realm, to address, amount int64) {
54	owner.AssertOwnedBy(cur.Previous().Address())
55	checkErr(privateLedger.Mint(to, amount))
56}
57
58func Burn(cur realm, from address, amount int64) {
59	owner.AssertOwnedBy(cur.Previous().Address())
60	checkErr(privateLedger.Burn(from, amount))
61}
62
63func Render(path string) string {
64	parts := strings.Split(path, "/")
65	c := len(parts)
66
67	switch {
68	case path == "":
69		return token.RenderHome()
70	case c == 2 && parts[0] == "balance":
71		owner := address(parts[1])
72		balance := userTeller.BalanceOf(owner)
73		return ufmt.Sprintf("%d\n", balance)
74	default:
75		return "404\n"
76	}
77}
78
79func checkErr(err error) {
80	if err != nil {
81		panic(err)
82	}
83}