feat: p/demo/subscription

examples/gno.land/p/demo/subscription/subscription.gno

@@ -0,0 +1,60 @@
+// Package subscription provides a basic Gno library for managing recurring
+// subscriptions.
+// The library allows users to create and manage different subscription models
+// to control access to specific features or resources.
+//
+// Example Usage:
+//
+//	import "gno.land/p/demo/subscription"
+//
+//	// Duration of 30 days and amount of 1000 units subscription.New
+//	var subs = subscription.NewRecurringSubscription(time.Hour*24*30, 1000)
+//
+//	func SomeHandler() {
+//		subs.CheckOrigCaller()
+//
+//		// Proceed with handling the request that requires a subscription
+//		// ...
+//	}
+package subscription // import "gno.land/p/demo/subscription"
+
+// RecurringSubscription represents a recurring subscription model with a given
+// duration and amount.
+type RecurringSubscription struct {
+	duration time.Duration
+	amount   int64
+	subs     *avl.Tree // std.Address -> time.Time
+}
+
+// NewRecurringSubscription creates a new instance of RecurringSubscription with
+// the specified duration and amount.
+//
+// The subs parameter is an AVL tree that holds the subscription status for each
+// user (std.Address) with their expiration time (time.Time).
+func NewRecurringSubscription(duration time.Duration, amount int64) *RecurringSubscription {
+	return &RecurringSubscription{
+		duration: duration,
+		amount:   amount,
+		subs:     avl.NewTree(),
+	}
+}
+
+// CheckOrigCaller checks the subscription status of the original caller.
+//
+// If the original caller does not have an active subscription or the
+// subscription has expired, it panics with an error message indicating the
+// required payment amount.
+//
+// This function should be called for each request that requires a subscription.
+func (rs *RecurringSubscription) CheckOrigCaller() {
+	send := std.GetOrigSend()
+	caller := std.GetOrigCaller()
+
+	// TODO implement
+	good := false
+	if !good {
+		panic("you need to pay a subscription of " + rs.amount)
+	}
+}
+
+// TODO: other subscription models

examples/gno.land/p/demo/subscription/subscription_test.gno

@@ -0,0 +1,11 @@
+package subscription
+
+import "testing"
+
+func TestPackage(t *testing.T) {
+	// Example: Duration of 30 days and amount of 1000 ugno
+	sub := subscription.NewRecurringSubscription(time.Hour*24*30, 1000)
+	// simulate send with std.TestSetOrigSend
+	// simulate orig caller with std.TestSetOrigCaller
+	sub.CheckOrigCaller()
+}