feat(examples): GnoFundMe Token v0

examples/gno.land/r/malek_/gfmt/gfmt.gno

@@ -0,0 +1,124 @@
+package gfmt
+
+import (
+	"errors"
+	"std"
+	"strings"
+
+	"gno.land/p/demo/grc/grc20"
+	"gno.land/p/demo/ownable"
+	"gno.land/p/demo/ufmt"
+	pusers "gno.land/p/demo/users"
+	"gno.land/r/demo/users"
+)
+
+var (
+	banker           *grc20.Banker
+	admin            *ownable.Ownable
+	Token            grc20.Token
+	ErrInvalidUint64 = errors.New("invalid uint64, must be between 0 and 18446744073709551615")
+)
+
+func init() {
+	admin = ownable.NewWithAddress("g10ahumypepd2qcrau7kahv8q78f7jcdns5tn54a") // owner's address (malek_)
+	banker = grc20.NewBanker("GnoFundMe Token", "gfmt", 0)
+	banker.Mint(admin.Owner(), 100_000_000_000)
+	Token = banker.Token()
+}
+
+const (
+	ugnotMinDeposit uint64 = 1000000 // 1 GNOT
+	gfmtMinDeposit  uint64 = 1
+)
+
+func Deposit() {
+	caller := std.PrevRealm().Addr()
+	sent := std.GetOrigSend()
+	amount := sent.AmountOf("ugnot")
+
+	require(uint64(amount) >= ugnotMinDeposit, ufmt.Sprintf("Deposit below minimum: %d/%d ugnot.", amount, ugnotMinDeposit))
+	checkErr(banker.Mint(caller, uint64(amount)))
+}
+
+func Withdraw(amount uint64) {
+	// check for overflow
+	// if amount < 0 || amount > 18446744073709551615 {
+	// 	panic("Invalid amount: Overflow uint64")
+	// }
+
+	require(amount >= gfmtMinDeposit, ufmt.Sprintf("Deposit below minimum: %d/%d gfmt.", amount, gfmtMinDeposit))
+
+	caller := std.PrevRealm().Addr()
+	pkgaddr := std.CurrentRealm().Addr()
+	callerBal := Token.BalanceOf(caller)
+	require(amount <= callerBal, ufmt.Sprintf("Insufficient balance: %d available, %d needed.", callerBal, amount))
+
+	// send swapped ugnots to qcaller
+	stdBanker := std.GetBanker(std.BankerTypeRealmSend)
+	send := std.Coins{{"ugnot", int64(amount)}}
+	stdBanker.SendCoins(pkgaddr, caller, send)
+	checkErr(banker.Burn(caller, amount))
+}
+
+func Render(path string) string {
+	parts := strings.Split(path, "/")
+	c := len(parts)
+
+	switch {
+	case path == "":
+		return banker.RenderHome()
+	case c == 2 && parts[0] == "balance":
+		owner := std.Address(parts[1])
+		balance := Token.BalanceOf(owner)
+		return ufmt.Sprintf("%s's balance is %dugnot", owner, balance)
+	default:
+		return "404"
+	}
+}
+
+func TotalSupply() uint64 { return Token.TotalSupply() }
+
+func BalanceOf(owner pusers.AddressOrName) uint64 {
+	ownerAddr := users.Resolve(owner)
+	return Token.BalanceOf(ownerAddr)
+}
+
+func Allowance(owner, spender pusers.AddressOrName) uint64 {
+	ownerAddr := users.Resolve(owner)
+	spenderAddr := users.Resolve(spender)
+	return Token.Allowance(ownerAddr, spenderAddr)
+}
+
+func Transfer(to pusers.AddressOrName, amount uint64) {
+	toAddr := users.Resolve(to)
+	checkErr(Token.Transfer(toAddr, amount))
+}
+
+func Approve(spender pusers.AddressOrName, amount uint64) {
+	spenderAddr := users.Resolve(spender)
+	checkErr(Token.Approve(spenderAddr, amount))
+}
+
+func TransferFrom(from, to pusers.AddressOrName, amount uint64) {
+	fromAddr := users.Resolve(from)
+	toAddr := users.Resolve(to)
+	checkErr(Token.TransferFrom(fromAddr, toAddr, amount))
+}
+
+func Burn(from pusers.AddressOrName, amount uint64) {
+	admin.AssertCallerIsOwner()
+	fromAddr := users.Resolve(from)
+	checkErr(banker.Burn(fromAddr, amount))
+}
+
+func require(condition bool, msg string) {
+	if !condition {
+		panic(msg)
+	}
+}
+
+func checkErr(err error) {
+	if err != nil {
+		panic(err)
+	}
+}

examples/gno.land/r/malek_/gfmt/gno.mod

@@ -0,0 +1,9 @@
+module gno.land/r/malek_/gfmt
+
+require (
+	gno.land/p/demo/grc/grc20 v0.0.0-latest
+	gno.land/p/demo/ownable v0.0.0-latest
+	gno.land/p/demo/ufmt v0.0.0-latest
+	gno.land/p/demo/users v0.0.0-latest
+	gno.land/r/demo/users v0.0.0-latest
+)

examples/gno.land/r/malek_/gfmt/z0_filetest.gno

@@ -0,0 +1,71 @@
+// PKGPATH: gno.land/r/malek_/gfmt_test
+package gfmt_test
+
+import (
+	"fmt"
+	"std"
+
+	"gno.land/p/demo/testutils"
+	"gno.land/r/malek_/gfmt"
+
+	pusers "gno.land/p/demo/users"
+)
+
+var (
+	addr1 = testutils.TestAddress("test1")
+	addrc = std.DerivePkgAddr("gno.land/r/malek_/gfmt")
+	addrt = std.DerivePkgAddr("gno.land/r/malek_/gfmt_test")
+)
+
+func main() {
+	std.TestSetOrigPkgAddr(addrc)
+	std.TestIssueCoins(addrc, std.Coins{{"ugnot", 100000001}}) // TODO: remove this
+
+	// issue ugnots
+	std.TestIssueCoins(addr1, std.Coins{{"ugnot", 100000001}})
+
+	// print initial state
+	printBalances()
+	// println(gfmt.Render("queues"))
+	// println("A -", gfmt.Render(""))
+
+	std.TestSetOrigCaller(addr1)
+	std.TestSetOrigSend(std.Coins{{"ugnot", 1_000_000}}, nil)
+	gfmt.Deposit()
+	printBalances()
+	gfmt.Withdraw(4242)
+	printBalances()
+}
+
+func printBalances() {
+	printSingleBalance := func(name string, addr std.Address) {
+		gfmtBal := gfmt.BalanceOf(pusers.AddressOrName(addr))
+		std.TestSetOrigCaller(addr)
+		robanker := std.GetBanker(std.BankerTypeReadonly)
+		coins := robanker.GetCoins(addr).AmountOf("ugnot")
+		fmt.Printf("| %-13s | addr=%s | gfmt=%-7d | ugnot=%-9d |\n",
+			name, addr, gfmtBal, coins)
+	}
+	println("-----------")
+	printSingleBalance("gfmt_test", addrt)
+	printSingleBalance("gfmt", addrc)
+	printSingleBalance("addr1", addr1)
+	println("-----------")
+}
+
+// Output:
+// -----------
+// | gfmt_test     | addr=g15pyg9fhp8nlt8vhvh4pwhvamdxzuk052mlj5s7 | gfmt=0       | ugnot=200000000 |
+// | gfmt          | addr=g1hralrm7msf9uc3nzjmpvmsxapfdxx2j5k4yhjm | gfmt=0       | ugnot=100000001 |
+// | addr1         | addr=g1w3jhxap3ta047h6lta047h6lta047h6l4mfnm7 | gfmt=0       | ugnot=100000001 |
+// -----------
+// -----------
+// | gfmt_test     | addr=g15pyg9fhp8nlt8vhvh4pwhvamdxzuk052mlj5s7 | gfmt=1000000 | ugnot=200000000 |
+// | gfmt          | addr=g1hralrm7msf9uc3nzjmpvmsxapfdxx2j5k4yhjm | gfmt=0       | ugnot=100000001 |
+// | addr1         | addr=g1w3jhxap3ta047h6lta047h6lta047h6l4mfnm7 | gfmt=0       | ugnot=100000001 |
+// -----------
+// -----------
+// | gfmt_test     | addr=g15pyg9fhp8nlt8vhvh4pwhvamdxzuk052mlj5s7 | gfmt=995758  | ugnot=200004242 |
+// | gfmt          | addr=g1hralrm7msf9uc3nzjmpvmsxapfdxx2j5k4yhjm | gfmt=0       | ugnot=99995759  |
+// | addr1         | addr=g1w3jhxap3ta047h6lta047h6lta047h6l4mfnm7 | gfmt=0       | ugnot=100000001 |
+// -----------