1// foo20 is a GRC20 token contract where all the grc20.Teller methods are
2// proxified with top-level functions. see also gno.land/r/demo/bar20.
3package foo20
4
5import (
6 "std"
7 "strings"
8
9 "gno.land/p/demo/grc/grc20"
10 "gno.land/p/demo/ownable"
11 "gno.land/p/demo/ufmt"
12 "gno.land/r/demo/grc20reg"
13)
14
15var (
16 Token, privateLedger = grc20.NewToken("Foo", "FOO", 4)
17 UserTeller = Token.CallerTeller()
18 Ownable = ownable.NewWithAddress("g1manfred47kzduec920z88wfr64ylksmdcedlf5") // @manfred
19)
20
21func init() {
22 privateLedger.Mint(Ownable.Owner(), 1_000_000*10_000) // @privateLedgeristrator (1M)
23 grc20reg.Register(Token.Getter(), "")
24}
25
26func TotalSupply() uint64 {
27 return UserTeller.TotalSupply()
28}
29
30func BalanceOf(owner std.Address) uint64 {
31 return UserTeller.BalanceOf(owner)
32}
33
34func Allowance(owner, spender std.Address) uint64 {
35 return UserTeller.Allowance(owner, spender)
36}
37
38func Transfer(to std.Address, amount uint64) {
39 checkErr(UserTeller.Transfer(to, amount))
40}
41
42func Approve(spender std.Address, amount uint64) {
43 checkErr(UserTeller.Approve(spender, amount))
44}
45
46func TransferFrom(from, to std.Address, amount uint64) {
47 checkErr(UserTeller.TransferFrom(from, to, amount))
48}
49
50// Faucet is distributing foo20 tokens without restriction (unsafe).
51// For a real token faucet, you should take care of setting limits are asking payment.
52func Faucet() {
53 caller := std.PrevRealm().Addr()
54 amount := uint64(1_000 * 10_000) // 1k
55 checkErr(privateLedger.Mint(caller, amount))
56}
57
58func Mint(to std.Address, amount uint64) {
59 Ownable.AssertCallerIsOwner()
60 checkErr(privateLedger.Mint(to, amount))
61}
62
63func Burn(from std.Address, amount uint64) {
64 Ownable.AssertCallerIsOwner()
65 checkErr(privateLedger.Burn(from, amount))
66}
67
68func Render(path string) string {
69 parts := strings.Split(path, "/")
70 c := len(parts)
71
72 switch {
73 case path == "":
74 return Token.RenderHome()
75 case c == 2 && parts[0] == "balance":
76 owner := std.Address(parts[1])
77 balance := UserTeller.BalanceOf(owner)
78 return ufmt.Sprintf("%d\n", balance)
79 default:
80 return "404\n"
81 }
82}
83
84func checkErr(err error) {
85 if err != nil {
86 panic(err)
87 }
88}
foo20.gno
2.08 Kb ยท 88 lines
