| 1 | package grc20factory |
| 2 | |
| 3 | import ( |
| 4 | "gno.land/p/moul/md/v0" |
| 5 | p "gno.land/p/nt/avl/pager/v0" |
| 6 | "gno.land/p/nt/avl/rotree/v0" |
| 7 | "gno.land/p/nt/avl/v0" |
| 8 | "gno.land/p/nt/grc20/v0" |
| 9 | "gno.land/p/nt/mux/v0" |
| 10 | "gno.land/p/nt/ownable/v0" |
| 11 | "gno.land/p/nt/seqid/v0" |
| 12 | "gno.land/p/nt/ufmt/v0" |
| 13 | "gno.land/r/nt/grc20reg/v0" |
| 14 | ) |
| 15 | |
| 16 | var ( |
| 17 | instances avl.Tree // symbol -> *instance |
| 18 | nextTokenID seqid.ID |
| 19 | pager = p.NewPager(rotree.Wrap(&instances, nil), 20, false) |
| 20 | ) |
| 21 | |
| 22 | type instance struct { |
| 23 | token *grc20.Token |
| 24 | ledger *grc20.PrivateLedger |
| 25 | admin *ownable.Ownable |
| 26 | faucet int64 // per-request amount. disabled if 0. |
| 27 | } |
| 28 | |
| 29 | func New(cur realm, name, symbol string, decimals int, initialMint, faucet int64) { |
| 30 | caller := cur.Previous().Address() |
| 31 | NewWithAdmin(cur, name, symbol, decimals, initialMint, faucet, caller) |
| 32 | } |
| 33 | |
| 34 | func NewWithAdmin(cur realm, name, symbol string, decimals int, initialMint, faucet int64, admin address) { |
| 35 | exists := instances.Has(symbol) |
| 36 | if exists { |
| 37 | panic("token already exists") |
| 38 | } |
| 39 | |
| 40 | token, ledger := grc20.NewToken(name, symbol, decimals, nextTokenID.Next(), cur) |
| 41 | if initialMint > 0 { |
| 42 | ledger.Mint(admin, initialMint) |
| 43 | } |
| 44 | |
| 45 | inst := instance{ |
| 46 | token: token, |
| 47 | ledger: ledger, |
| 48 | admin: ownable.NewWithAddress(admin), |
| 49 | faucet: faucet, |
| 50 | } |
| 51 | instances.Set(symbol, &inst) |
| 52 | |
| 53 | grc20reg.Register(cross(cur), token, symbol) |
| 54 | } |
| 55 | |
| 56 | func Bank(symbol string) *grc20.Token { |
| 57 | inst := mustGetInstance(symbol) |
| 58 | return inst.token |
| 59 | } |
| 60 | |
| 61 | func TotalSupply(symbol string) int64 { |
| 62 | inst := mustGetInstance(symbol) |
| 63 | return inst.token.ReadonlyTeller().TotalSupply() |
| 64 | } |
| 65 | |
| 66 | func HasAddr(symbol string, owner address) bool { |
| 67 | inst := mustGetInstance(symbol) |
| 68 | return inst.token.HasAddr(owner) |
| 69 | } |
| 70 | |
| 71 | func BalanceOf(symbol string, owner address) int64 { |
| 72 | inst := mustGetInstance(symbol) |
| 73 | return inst.token.ReadonlyTeller().BalanceOf(owner) |
| 74 | } |
| 75 | |
| 76 | func Allowance(symbol string, owner, spender address) int64 { |
| 77 | inst := mustGetInstance(symbol) |
| 78 | return inst.token.ReadonlyTeller().Allowance(owner, spender) |
| 79 | } |
| 80 | |
| 81 | func Transfer(cur realm, symbol string, to address, amount int64) { |
| 82 | inst := mustGetInstance(symbol) |
| 83 | caller := cur.Previous().Address() |
| 84 | teller := inst.ledger.ImpersonateTeller(caller) |
| 85 | checkErr(teller.Transfer(0, cur, to, amount)) |
| 86 | } |
| 87 | |
| 88 | func Approve(cur realm, symbol string, spender address, amount int64) { |
| 89 | inst := mustGetInstance(symbol) |
| 90 | caller := cur.Previous().Address() |
| 91 | teller := inst.ledger.ImpersonateTeller(caller) |
| 92 | checkErr(teller.Approve(0, cur, spender, amount)) |
| 93 | } |
| 94 | |
| 95 | func TransferFrom(cur realm, symbol string, from, to address, amount int64) { |
| 96 | inst := mustGetInstance(symbol) |
| 97 | caller := cur.Previous().Address() |
| 98 | teller := inst.ledger.ImpersonateTeller(caller) |
| 99 | checkErr(teller.TransferFrom(0, cur, from, to, amount)) |
| 100 | } |
| 101 | |
| 102 | // faucet. |
| 103 | func Faucet(cur realm, symbol string) { |
| 104 | inst := mustGetInstance(symbol) |
| 105 | if inst.faucet == 0 { |
| 106 | panic("faucet disabled for this token") |
| 107 | } |
| 108 | // FIXME: add limits? |
| 109 | // FIXME: add payment in gnot? |
| 110 | caller := cur.Previous().Address() |
| 111 | checkErr(inst.ledger.Mint(caller, inst.faucet)) |
| 112 | } |
| 113 | |
| 114 | func Mint(cur realm, symbol string, to address, amount int64) { |
| 115 | inst := mustGetInstance(symbol) |
| 116 | inst.admin.AssertOwnedBy(cur.Previous().Address()) |
| 117 | checkErr(inst.ledger.Mint(to, amount)) |
| 118 | } |
| 119 | |
| 120 | func Burn(cur realm, symbol string, from address, amount int64) { |
| 121 | inst := mustGetInstance(symbol) |
| 122 | inst.admin.AssertOwnedBy(cur.Previous().Address()) |
| 123 | checkErr(inst.ledger.Burn(from, amount)) |
| 124 | } |
| 125 | |
| 126 | // instance admin functionality |
| 127 | func DropInstanceOwnership(cur realm, symbol string) { |
| 128 | inst := mustGetInstance(symbol) |
| 129 | checkErr(inst.admin.DropOwnership(0, cur)) |
| 130 | } |
| 131 | |
| 132 | func TransferInstanceOwnership(cur realm, symbol string, newOwner address) { |
| 133 | inst := mustGetInstance(symbol) |
| 134 | checkErr(inst.admin.TransferOwnership(0, cur, newOwner)) |
| 135 | } |
| 136 | |
| 137 | func ListTokens(pageNumber, pageSize int) []*grc20.Token { |
| 138 | page := pager.GetPageWithSize(pageNumber, pageSize) |
| 139 | |
| 140 | tokens := make([]*grc20.Token, len(page.Items)) |
| 141 | for i := range page.Items { |
| 142 | tokens[i] = page.Items[i].Value.(*instance).token |
| 143 | } |
| 144 | |
| 145 | return tokens |
| 146 | } |
| 147 | |
| 148 | func Render(path string) string { |
| 149 | router := mux.NewRouter() |
| 150 | router.HandleFunc("", renderHome) |
| 151 | router.HandleFunc("{symbol}", renderToken) |
| 152 | router.HandleFunc("{symbol}/balance/{address}", renderBalance) |
| 153 | return router.Render(path) |
| 154 | } |
| 155 | |
| 156 | func renderHome(res *mux.ResponseWriter, req *mux.Request) { |
| 157 | out := md.H1(ufmt.Sprintf("GRC20 Tokens (%d)", instances.Size())) |
| 158 | |
| 159 | // Get the current page of tokens based on the request path. |
| 160 | page := pager.MustGetPageByPath(req.RawPath) |
| 161 | |
| 162 | // Render the list of tokens. |
| 163 | for _, item := range page.Items { |
| 164 | token := item.Value.(*instance).token |
| 165 | out += md.BulletItem( |
| 166 | md.Link( |
| 167 | ufmt.Sprintf("%s ($%s)", token.GetName(), token.GetSymbol()), |
| 168 | ufmt.Sprintf("/r/demo/grc20factory:%s", token.GetSymbol()), |
| 169 | ), |
| 170 | ) |
| 171 | } |
| 172 | out += "\n" |
| 173 | |
| 174 | // Add the page picker. |
| 175 | out += md.Paragraph(page.Picker(req.Path)) |
| 176 | |
| 177 | res.Write(out) |
| 178 | } |
| 179 | |
| 180 | func renderToken(res *mux.ResponseWriter, req *mux.Request) { |
| 181 | // Get the token symbol from the request. |
| 182 | symbol := req.GetVar("symbol") |
| 183 | inst := mustGetInstance(symbol) |
| 184 | |
| 185 | // Render the token details. |
| 186 | out := inst.token.RenderHome() |
| 187 | out += md.BulletItem( |
| 188 | ufmt.Sprintf("%s: %s", md.Bold("Admin"), inst.admin.Owner()), |
| 189 | ) |
| 190 | |
| 191 | res.Write(out) |
| 192 | } |
| 193 | |
| 194 | func renderBalance(res *mux.ResponseWriter, req *mux.Request) { |
| 195 | var ( |
| 196 | symbol = req.GetVar("symbol") |
| 197 | addr = req.GetVar("address") |
| 198 | ) |
| 199 | |
| 200 | // Get the balance of the specified address for the token. |
| 201 | inst := mustGetInstance(symbol) |
| 202 | balance := inst.token.BalanceOf(address(addr)) |
| 203 | |
| 204 | // Render the balance information. |
| 205 | out := md.Paragraph( |
| 206 | ufmt.Sprintf("%s balance: %d", md.Bold(addr), balance), |
| 207 | ) |
| 208 | |
| 209 | res.Write(out) |
| 210 | } |
| 211 | |
| 212 | func mustGetInstance(symbol string) *instance { |
| 213 | t := instances.Get(symbol) |
| 214 | if t == nil { |
| 215 | panic("token instance does not exist") |
| 216 | } |
| 217 | return t.(*instance) |
| 218 | } |
| 219 | |
| 220 | func checkErr(err error) { |
| 221 | if err != nil { |
| 222 | panic(err.Error()) |
| 223 | } |
| 224 | } |
