feat: grc20 dynamic call with registered interface

examples/gno.land/r/x/grc20_dynamic_call/bar/bar.gno

@@ -0,0 +1,131 @@
+package bar
+
+import (
+	"std"
+	"strings"
+
+	"gno.land/p/demo/grc/grc20"
+	"gno.land/p/demo/ufmt"
+	"gno.land/r/demo/users"
+)
+
+var (
+	bar   *grc20.AdminToken
+	admin std.Address = "g1us8428u2a5satrlxzagqqa5m6vmuze025anjlj" // TODO: helper to change admin
+)
+
+func init() {
+	bar = grc20.NewAdminToken("Bar", "BAR", 4)
+	bar.Mint(admin, 1000000*10000)                                    // @administrator (1M)
+	bar.Mint("g1u7y667z64x2h7vc6fmpcprgey4ck233jaww9zq", 10000*10000) // @manfred (10k)
+
+	bar.Mint("g1tkmrcu9m0xjddxh0c29r3zac8m2yjwaytlvh6u", 1000*10000) // REALM_gno.land/r/x/grc20_dynamic_call/registry
+}
+
+// method proxies as public functions.
+//
+
+// getters.
+
+func TotalSupply() uint64 {
+	return bar.TotalSupply()
+}
+
+func BalanceOf(owner users.AddressOrName) uint64 {
+	balance, err := bar.BalanceOf(owner.Resolve())
+	if err != nil {
+		panic(err.Error())
+	}
+	return balance
+}
+
+func Allowance(owner, spender users.AddressOrName) uint64 {
+	allowance, err := bar.Allowance(owner.Resolve(), spender.Resolve())
+	if err != nil {
+		panic(err.Error())
+	}
+	return allowance
+}
+
+// setters.
+
+func Transfer(to users.AddressOrName, amount uint64) {
+	caller := std.PrevRealm().Addr()
+	err := bar.Transfer(caller, to.Resolve(), amount)
+	if err != nil {
+		panic(err.Error())
+	}
+}
+
+func Approve(spender users.AddressOrName, amount uint64) {
+	caller := std.PrevRealm().Addr()
+	err := bar.Approve(caller, spender.Resolve(), amount)
+	if err != nil {
+		panic(err.Error())
+	}
+}
+
+func TransferFrom(from, to users.AddressOrName, amount uint64) {
+	caller := std.PrevRealm().Addr()
+	err := bar.TransferFrom(caller, from.Resolve(), to.Resolve(), amount)
+	if err != nil {
+		panic(err.Error())
+	}
+}
+
+// faucet.
+
+func Faucet() {
+	// FIXME: add limits?
+	// FIXME: add payment in gnot?
+	caller := std.PrevRealm().Addr()
+	err := bar.Mint(caller, 1000*10000) // 1k
+	if err != nil {
+		panic(err.Error())
+	}
+}
+
+// administration.
+
+func Mint(address users.AddressOrName, amount uint64) {
+	caller := std.PrevRealm().Addr()
+	assertIsAdmin(caller)
+	err := bar.Mint(address.Resolve(), amount)
+	if err != nil {
+		panic(err.Error())
+	}
+}
+
+func Burn(address users.AddressOrName, amount uint64) {
+	caller := std.PrevRealm().Addr()
+	assertIsAdmin(caller)
+	err := bar.Burn(address.Resolve(), amount)
+	if err != nil {
+		panic(err.Error())
+	}
+}
+
+// render.
+//
+
+func Render(path string) string {
+	parts := strings.Split(path, "/")
+	c := len(parts)
+
+	switch {
+	case path == "":
+		return bar.RenderHome()
+	case c == 2 && parts[0] == "balance":
+		owner := users.AddressOrName(parts[1])
+		balance, _ := bar.BalanceOf(owner.Resolve())
+		return ufmt.Sprintf("%d\n", balance)
+	default:
+		return "404\n"
+	}
+}
+
+func assertIsAdmin(address std.Address) {
+	if address != admin {
+		panic("restricted access")
+	}
+}

examples/gno.land/r/x/grc20_dynamic_call/bar/gno.mod

@@ -0,0 +1,7 @@
+module gno.land/r/x/grc20_dynamic_call/bar
+
+require (
+	gno.land/p/demo/grc/grc20 v0.0.0-latest
+	gno.land/p/demo/ufmt v0.0.0-latest
+	gno.land/r/demo/users v0.0.0-latest
+)

examples/gno.land/r/x/grc20_dynamic_call/foo/foo.gno

@@ -0,0 +1,131 @@
+package foo
+
+import (
+	"std"
+	"strings"
+
+	"gno.land/p/demo/grc/grc20"
+	"gno.land/p/demo/ufmt"
+	"gno.land/r/demo/users"
+)
+
+var (
+	foo   *grc20.AdminToken
+	admin std.Address = "g1us8428u2a5satrlxzagqqa5m6vmuze025anjlj" // TODO: helper to change admin
+)
+
+func init() {
+	foo = grc20.NewAdminToken("Foo", "FOO", 4)
+	foo.Mint(admin, 1000000*10000)                                    // @administrator (1M)
+	foo.Mint("g1u7y667z64x2h7vc6fmpcprgey4ck233jaww9zq", 10000*10000) // @manfred (10k)
+
+	foo.Mint("g1tkmrcu9m0xjddxh0c29r3zac8m2yjwaytlvh6u", 1000*10000) // REALM_gno.land/r/x/grc20_dynamic_call/registry
+}
+
+// method proxies as public functions.
+//
+
+// getters.
+
+func TotalSupply() uint64 {
+	return foo.TotalSupply()
+}
+
+func BalanceOf(owner users.AddressOrName) uint64 {
+	balance, err := foo.BalanceOf(owner.Resolve())
+	if err != nil {
+		panic(err.Error())
+	}
+	return balance
+}
+
+func Allowance(owner, spender users.AddressOrName) uint64 {
+	allowance, err := foo.Allowance(owner.Resolve(), spender.Resolve())
+	if err != nil {
+		panic(err.Error())
+	}
+	return allowance
+}
+
+// setters.
+
+func Transfer(to users.AddressOrName, amount uint64) {
+	caller := std.PrevRealm().Addr()
+	err := foo.Transfer(caller, to.Resolve(), amount)
+	if err != nil {
+		panic(err.Error())
+	}
+}
+
+func Approve(spender users.AddressOrName, amount uint64) {
+	caller := std.PrevRealm().Addr()
+	err := foo.Approve(caller, spender.Resolve(), amount)
+	if err != nil {
+		panic(err.Error())
+	}
+}
+
+func TransferFrom(from, to users.AddressOrName, amount uint64) {
+	caller := std.PrevRealm().Addr()
+	err := foo.TransferFrom(caller, from.Resolve(), to.Resolve(), amount)
+	if err != nil {
+		panic(err.Error())
+	}
+}
+
+// faucet.
+
+func Faucet() {
+	// FIXME: add limits?
+	// FIXME: add payment in gnot?
+	caller := std.PrevRealm().Addr()
+	err := foo.Mint(caller, 1000*10000) // 1k
+	if err != nil {
+		panic(err.Error())
+	}
+}
+
+// administration.
+
+func Mint(address users.AddressOrName, amount uint64) {
+	caller := std.PrevRealm().Addr()
+	assertIsAdmin(caller)
+	err := foo.Mint(address.Resolve(), amount)
+	if err != nil {
+		panic(err.Error())
+	}
+}
+
+func Burn(address users.AddressOrName, amount uint64) {
+	caller := std.PrevRealm().Addr()
+	assertIsAdmin(caller)
+	err := foo.Burn(address.Resolve(), amount)
+	if err != nil {
+		panic(err.Error())
+	}
+}
+
+// render.
+//
+
+func Render(path string) string {
+	parts := strings.Split(path, "/")
+	c := len(parts)
+
+	switch {
+	case path == "":
+		return foo.RenderHome()
+	case c == 2 && parts[0] == "balance":
+		owner := users.AddressOrName(parts[1])
+		balance, _ := foo.BalanceOf(owner.Resolve())
+		return ufmt.Sprintf("%d\n", balance)
+	default:
+		return "404\n"
+	}
+}
+
+func assertIsAdmin(address std.Address) {
+	if address != admin {
+		panic("restricted access")
+	}
+}

examples/gno.land/r/x/grc20_dynamic_call/foo/gno.mod

@@ -0,0 +1,7 @@
+module gno.land/r/x/grc20_dynamic_call/foo
+
+require (
+	gno.land/p/demo/grc/grc20 v0.0.0-latest
+	gno.land/p/demo/ufmt v0.0.0-latest
+	gno.land/r/demo/users v0.0.0-latest
+)

examples/gno.land/r/x/grc20_dynamic_call/registry/gno.mod

@@ -0,0 +1,6 @@
+module gno.land/r/x/grc20_dynamic_call/registry
+
+require (
+	gno.land/p/demo/ufmt v0.0.0-latest
+	gno.land/r/demo/users v0.0.0-latest
+)

examples/gno.land/r/x/grc20_dynamic_call/registry/registry.gno

@@ -0,0 +1,80 @@
+package registry
+
+import (
+	"std"
+
+	"gno.land/p/demo/ufmt"
+
+	"gno.land/r/demo/users"
+)
+
+const (
+	APPROVED_UNREGISTER_CALLER = "g1sqt92sa06ugh8nlt98kyghw83qy84paf4csyh6" // like admin
+)
+
+type GRC20Interface interface {
+	Transfer() func(to users.AddressOrName, amount uint64)
+	TransferFrom() func(from, to users.AddressOrName, amount uint64)
+	BalanceOf() func(owner users.AddressOrName) uint64
+}
+
+var (
+	registered = make(map[string]GRC20Interface)
+)
+
+func RegisterGRC20Interface(pkgPath string, igrc20 GRC20Interface) {
+	_, found := registered[pkgPath]
+	if found {
+		panic(ufmt.Sprintf("GRC20(pkgPath:%s) already registered", pkgPath))
+	}
+
+	registered[pkgPath] = igrc20
+}
+
+func UnregisterGRC20Interface(pkgPath string) {
+	// do not allow realm to unregister
+	std.AssertOriginCall()
+
+	caller := std.GetOrigCaller()
+	if caller != APPROVED_UNREGISTER_CALLER {
+		panic("unauthorized")
+	}
+
+	_, found := registered[pkgPath]
+	if found {
+		delete(registered, pkgPath)
+	}
+}
+
+func BalanceOfByInterface(pkgPath string, owner std.Address) uint64 {
+	igrc20, found := registered[pkgPath]
+	if !found {
+		return false
+	}
+
+	return igrc20.BalanceOf()(users.AddressOrName(owner))
+}
+
+func TransferByInterface(pkgPath string, to std.Address, amount uint64) bool {
+	igrc20, found := registered[pkgPath]
+	if !found {
+		return false
+	}
+
+	// will panic if transfer fails
+	igrc20.Transfer()(users.AddressOrName(to), amount)
+
+	return true
+}
+
+func TransferFromByInterface(pkgPath string, from, to std.Address, amount uint64) bool {
+	igrc20, found := registered[pkgPath]
+	if !found {
+		return false
+	}
+
+	// will panic if transferFrom fails
+	igrc20.TransferFrom()(users.AddressOrName(from), users.AddressOrName(to), amount)
+
+	return true
+}