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Arguments · 9

1. #1crowdfund
2. #2README.md
3. #3# Crowdfund > ⚠️ **Experimental — generated with no human supervision** by the daily MCP pipeline (Solidity→Gno port). Not audited. See [r/moul/x/daily](https://github.com/moul/gno-contracts/blob/main/r/moul/x/daily/README.md). --- A gno.land realm port of the classic Solidity **Kickstarter-style crowdfunding** contract. It keeps the same lifecycle — launch a campaign with a goal and a deadline, let backers pledge and unpledge, then either let the creator claim on success or let backers refund on failure — but models everything as plain `uint64` accounting (no real coin transfer), the idiomatic Gno equivalent of the Solidity `mapping(address => uint)` balances. Deadlines use `runtime.ChainHeight()` (block height) instead of `block.timestamp`, `msg.sender` becomes `unsafe.PreviousRealm().Address()`, `require` becomes `panic`, and campaigns live in an ordered `avl.Tree` so `Render` lists them deterministically with a `▓░` progress bar. ## Transactions - `Launch(goal uint64, durationBlocks int) int` — create a campaign (returns id); deadline = current height + duration. - `Pledge(id int, amount uint64)` — back a campaign before its deadline. - `Unpledge(id int, amount uint64)` — withdraw part/all of your pledge before the deadline. - `Claim(id int)` — creator claims funds after the deadline if `pledged >= goal`. - `Refund(id int)` — backer reclaims their pledge after the deadline if the goal was missed. ## Example ``` Launch(1000, 100) // campaign #1, goal 1000, ends 100 blocks from now -> returns 1 Pledge(1, 400) // back campaign #1 with 400 Pledge(1, 700) // total now 1100 (>= goal) Unpledge(1, 100) // change of mind: total back to 1000 // ... after block height passes the deadline ... Claim(1) // creator claims 1000 (goal met) ``` Read-only `Render("")` shows every campaign with its progress bar, goal, pledged total, deadline block and state (Active / Funded / Funded (claimed) / Failed). <!-- BEGIN GNOCONTRACTS FOOTER (generated by `make readmes`; do not edit below) --> --- Part of **[moul/gno-contracts](https://github.com/moul/gno-contracts)** — moul's versioned gno.land contracts. See the repository for the full catalog, build/test tooling, and usage. **Dependency graph:**  > 🧪 **Highly experimental — potentially vibe-coded.** Not audited; may break, change, or be removed at any time. Do not use with anything of value. Full disclaimer: [DISCLAIMER](https://github.com/moul/gno-contracts/blob/main/DISCLAIMER.md). <!-- END GNOCONTRACTS FOOTER -->
4. #4crowdfund.gno
5. #5// Package crowdfund is an accounting-only port of the classic Solidity // Kickstarter-style crowdfunding contract to a gno.land realm. // // A creator Launches a campaign with a funding goal and a duration (in blocks). // Backers Pledge (and may Unpledge before the deadline). After the deadline the // creator can Claim if the goal was met, otherwise backers can Refund. // // No real coin moves: pledges are tracked as plain uint64 accounting, exactly // like the mapping(address => uint) balances of the Solidity original. package crowdfund import ( "strconv" "chain" "chain/runtime" "chain/runtime/unsafe" "gno.land/p/nt/avl/v0" ) // Campaign holds the state of a single crowdfunding campaign. type Campaign struct { ID int Creator address Goal uint64 Deadline int64 // block height after which the campaign is closed Pledged uint64 // running total pledged Claimed bool // creator already claimed the funds pledges *avl.Tree // backer address (string) -> pledged uint64 } var ( campaigns = avl.NewTree() // padded id -> *Campaign (ordered by id) nextID = 1 ) // key zero-pads an id so avl iteration is in numeric order. func key(id int) string { s := strconv.Itoa(id) for len(s) < 12 { s = "0" + s } return s } func mustGet(id int) *Campaign { v := campaigns.Get(key(id)) if v == nil { panic("campaign not found") } return v.(*Campaign) } // Launch creates a new campaign owned by the caller and returns its id. func Launch(cur realm, goal uint64, durationBlocks int) int { if goal == 0 { panic("goal must be > 0") } if durationBlocks <= 0 { panic("duration must be > 0") } caller := unsafe.PreviousRealm().Address() id := nextID nextID++ c := &Campaign{ ID: id, Creator: caller, Goal: goal, Deadline: runtime.ChainHeight() + int64(durationBlocks), pledges: avl.NewTree(), } campaigns.Set(key(id), c) chain.Emit("Launch", "id", strconv.Itoa(id), "creator", caller.String(), "goal", strconv.FormatUint(goal, 10)) return id } // Pledge backs campaign id with amount (before the deadline). func Pledge(cur realm, id int, amount uint64) { if amount == 0 { panic("amount must be > 0") } c := mustGet(id) if runtime.ChainHeight() > c.Deadline { panic("campaign ended") } caller := unsafe.PreviousRealm().Address() prev := uint64(0) if v := c.pledges.Get(caller.String()); v != nil { prev = v.(uint64) } c.pledges.Set(caller.String(), prev+amount) c.Pledged += amount chain.Emit("Pledge", "id", strconv.Itoa(id), "from", caller.String(), "amount", strconv.FormatUint(amount, 10)) } // Unpledge withdraws amount from the caller's pledge (before the deadline). func Unpledge(cur realm, id int, amount uint64) { if amount == 0 { panic("amount must be > 0") } c := mustGet(id) if runtime.ChainHeight() > c.Deadline { panic("campaign ended") } caller := unsafe.PreviousRealm().Address() v := c.pledges.Get(caller.String()) if v == nil { panic("nothing pledged") } have := v.(uint64) if amount > have { panic("amount exceeds pledge") } if remaining := have - amount; remaining == 0 { c.pledges.Remove(caller.String()) } else { c.pledges.Set(caller.String(), remaining) } c.Pledged -= amount chain.Emit("Unpledge", "id", strconv.Itoa(id), "from", caller.String(), "amount", strconv.FormatUint(amount, 10)) } // Claim lets the creator take the funds if the goal was met after the deadline. func Claim(cur realm, id int) { c := mustGet(id) if runtime.ChainHeight() <= c.Deadline { panic("campaign not ended") } caller := unsafe.PreviousRealm().Address() if caller != c.Creator { panic("only creator can claim") } if c.Pledged < c.Goal { panic("goal not reached") } if c.Claimed { panic("already claimed") } c.Claimed = true chain.Emit("Claim", "id", strconv.Itoa(id), "amount", strconv.FormatUint(c.Pledged, 10)) } // Refund returns the caller's pledge if the campaign failed after the deadline. func Refund(cur realm, id int) { c := mustGet(id) if runtime.ChainHeight() <= c.Deadline { panic("campaign not ended") } if c.Pledged >= c.Goal { panic("campaign succeeded, no refund") } caller := unsafe.PreviousRealm().Address() v := c.pledges.Get(caller.String()) if v == nil { panic("nothing to refund") } amount := v.(uint64) c.pledges.Remove(caller.String()) c.Pledged -= amount chain.Emit("Refund", "id", strconv.Itoa(id), "to", caller.String(), "amount", strconv.FormatUint(amount, 10)) } // --- pure/read-only helpers (also used by Render) --- // pct returns the funded percentage (0..100). func pct(pledged, goal uint64) int { if goal == 0 { return 0 } p := int(pledged * 100 / goal) if p > 100 { p = 100 } return p } // progressBar renders a fixed-width ▓░ bar for pledged/goal. func progressBar(pledged, goal uint64) string { const width = 20 filled := 0 if goal > 0 { filled = int(pledged * width / goal) if filled > width { filled = width } } bar := "" for i := 0; i < width; i++ { if i < filled { bar += "▓" } else { bar += "░" } } return bar } // state describes a campaign relative to a given block height. func state(c *Campaign, height int64) string { if height <= c.Deadline { return "Active" } if c.Pledged >= c.Goal { if c.Claimed { return "Funded (claimed)" } return "Funded" } return "Failed" } // Render shows all campaigns with a progress bar, goal, pledged and state. func Render(path string) string { if campaigns.Size() == 0 { return "# Crowdfund\n\nNo campaigns yet. Call `Launch(goal, durationBlocks)` to start one.\n" } height := runtime.ChainHeight() out := "# Crowdfund\n\n" out += "Current block height: **" + strconv.FormatInt(height, 10) + "**\n\n" campaigns.Iterate("", "", func(k string, v any) bool { c := v.(*Campaign) out += "## Campaign #" + strconv.Itoa(c.ID) + "\n\n" out += "`" + progressBar(c.Pledged, c.Goal) + "` " + strconv.Itoa(pct(c.Pledged, c.Goal)) + "%\n\n" out += "- State: **" + state(c, height) + "**\n" out += "- Goal: " + strconv.FormatUint(c.Goal, 10) + "\n" out += "- Pledged: " + strconv.FormatUint(c.Pledged, 10) + "\n" out += "- Deadline: block " + strconv.FormatInt(c.Deadline, 10) + "\n" out += "- Creator: `" + c.Creator.String() + "`\n\n" return false }) return out }
6. #6gnomod.toml
7. #7module = "gno.land/r/moul/x/daily/crowdfund/v0" gno = "0.9"
8. #8/gno.MemPackageType
9. #9 MPUserProd