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D3SKRegistry

// D3SKRegistry.cdc — Onchain offer index for discoverability // Holds NO funds. Purely an index of active offers. access(all) contract D3SKRegistry { // ── Events ──────────────────────────────────────────────────── access(all) event OfferRegistered( id: UInt64, maker: Address, sellType: String, sellAmount: UFix64, askType: String, askAmount: UFix64 ) access(all) event OfferRemoved(id: UInt64, reason: String) // ── Offer Listing Struct ───────────────────────────────────── access(all) struct OfferListing { access(all) let id: UInt64 access(all) let maker: Address access(all) let sellType: String access(all) let sellAmount: UFix64 access(all) let askType: String access(all) let askAmount: UFix64 access(all) let price: UFix64 // askAmount / sellAmount access(all) let createdAt: UFix64 access(all) let expiresAt: UFix64? // nil = no expiration init( id: UInt64, maker: Address, sellType: String, sellAmount: UFix64, askType: String, askAmount: UFix64, createdAt: UFix64, expiresAt: UFix64? ) { self.id = id self.maker = maker self.sellType = sellType self.sellAmount = sellAmount self.askType = askType self.askAmount = askAmount // Calculate price as ask per unit of sell if sellAmount > 0.0 { self.price = askAmount / sellAmount } else { self.price = 0.0 } self.createdAt = createdAt self.expiresAt = expiresAt } } // ── State ───────────────────────────────────────────────────── // All active offer listings indexed by ID access(self) var listings: {UInt64: OfferListing} // Index: maker address -> set of offer IDs access(self) var makerOffers: {Address: [UInt64]} // Index: pair key (sellType-askType) -> set of offer IDs access(self) var pairOffers: {String: [UInt64]} // Track known pairs access(all) var knownPairs: [String] // ── Registration ────────────────────────────────────────────── access(all) fun registerOffer( id: UInt64, maker: Address, sellType: String, sellAmount: UFix64, askType: String, askAmount: UFix64, expiresAt: UFix64? ) { let listing = OfferListing( id: id, maker: maker, sellType: sellType, sellAmount: sellAmount, askType: askType, askAmount: askAmount, createdAt: getCurrentBlock().timestamp, expiresAt: expiresAt ) self.listings[id] = listing // Update maker index if self.makerOffers[maker] == nil { self.makerOffers[maker] = [] } self.makerOffers[maker]!.append(id) // Update pair index let pairKey = self.getPairKey(sellType: sellType, askType: askType) if self.pairOffers[pairKey] == nil { self.pairOffers[pairKey] = [] self.knownPairs.append(pairKey) } self.pairOffers[pairKey]!.append(id) emit OfferRegistered( id: id, maker: maker, sellType: sellType, sellAmount: sellAmount, askType: askType, askAmount: askAmount ) } // ── Removal ─────────────────────────────────────────────────── access(all) fun removeOffer(id: UInt64, reason: String) { if let listing = self.listings[id] { // Remove from maker index if var makerList = self.makerOffers[listing.maker] { var i = 0 while i < makerList.length { if makerList[i] == id { makerList.remove(at: i) break } i = i + 1 } self.makerOffers[listing.maker] = makerList if makerList.length == 0 { self.makerOffers.remove(key: listing.maker) } } // Remove from pair index let pairKey = self.getPairKey(sellType: listing.sellType, askType: listing.askType) if var pairList = self.pairOffers[pairKey] { var i = 0 while i < pairList.length { if pairList[i] == id { pairList.remove(at: i) break } i = i + 1 } self.pairOffers[pairKey] = pairList if pairList.length == 0 { self.pairOffers.remove(key: pairKey) // Also remove from knownPairs var pairIdx = 0 while pairIdx < self.knownPairs.length { if self.knownPairs[pairIdx] == pairKey { self.knownPairs.remove(at: pairIdx) break } pairIdx = pairIdx + 1 } } } // Remove from main listings self.listings.remove(key: id) emit OfferRemoved(id: id, reason: reason) } } // ── Queries ─────────────────────────────────────────────────── // Get all active listings access(all) fun getAllListings(): [OfferListing] { return self.listings.values } // Get listing by ID access(all) fun getListing(id: UInt64): OfferListing? { return self.listings[id] } // Get all listings for a maker access(all) fun getListingsByMaker(maker: Address): [OfferListing] { let result: [OfferListing] = [] if let ids = self.makerOffers[maker] { for id in ids { if let listing = self.listings[id] { result.append(listing) } } } return result } // Get all listings for a trading pair access(all) fun getListingsByPair(sellType: String, askType: String): [OfferListing] { let result: [OfferListing] = [] let pairKey = self.getPairKey(sellType: sellType, askType: askType) if let ids = self.pairOffers[pairKey] { for id in ids { if let listing = self.listings[id] { result.append(listing) } } } return result } // Get all known trading pairs access(all) fun getPairs(): [String] { return self.knownPairs } // Get total number of active offers access(all) fun getTotalOffers(): Int { return self.listings.keys.length } // ── Helpers ─────────────────────────────────────────────────── access(all) fun getPairKey(sellType: String, askType: String): String { return sellType.concat("-").concat(askType) } // ── Contract Init ───────────────────────────────────────────── init() { self.listings = {} self.makerOffers = {} self.pairOffers = {} self.knownPairs = [] } }