Take list as buyer - tx

Take the 𝔉rc20 token sale listing as a buyer

Example of Fixes Inscription data string:

op=list-take-buynow,tick=fixes,amt=10000.0

Transaction parameters:

Key	Required	FType	Description
tick		t.String	Ticker: identity of the 𝔉rc20 token
batchBuyItems		t.Dictionary({ key: t.String, value: t.UFix64 })	The dictionary for buying: rankedId => Amount You can get RankedListingId by querying the marketplace

📓Note: The key of batchBuyItems should be itemInMarket.rankedId which can be obtained in the response of querying listings. and the value is how much tokens you will take in the order. 𝔉rc20 trading orders support partial deal.

Transaction code example:

import txUserTakeAsBuyer from "@fixes/contracts/transactions/marketplace/user-take-as-buyer-with-commission.cdc?raw";

async function userTakeAsBuyer(
  tick: string,
  batchBuyItems: Record<string, number>
) {
  let args: Array<{ key: string; value: string }> = [];
  for (const key in batchBuyItems) {
    if (!Object.prototype.hasOwnProperty.call(batchBuyItems, key)) continue;
    args.push({
      key,
      value: batchBuyItems[key].toFixed(8),
    });
  }
  const txid = await flow.sendTransaction(txUserTakeAsBuyer, (arg, t) => [
    arg(tick, t.String),
    arg(args, t.Dictionary({ key: t.String, value: t.UFix64 })),
  ]);
  return txid;
}

Transaction source code

https://github.com/fixes-world/fixes/blob/main/cadence/transactions/marketplace/user-take-as-buyer-with-commission.cdc

// Thirdparty imports
import "MetadataViews"
import "FungibleToken"
import "FlowToken"
// Fixes imports
import "Fixes"
import "FixesInscriptionFactory"
import "FixesAvatar"
import "FixesHeartbeat"
import "FRC20FTShared"
import "FRC20Indexer"
import "FRC20TradingRecord"
import "FRC20Storefront"
import "FRC20Marketplace"
import "FRC20MarketManager"

transaction(
    tick: String,
    // RankedId => BuyAmount
    batchBuyItems: {String: UFix64},
) {
    let market: &{FRC20Marketplace.MarketPublic}

    prepare(acct: auth(Storage, Capabilities) &Account) {
        /** ------------- Prepare the Inscription Store - Start ---------------- */
        let storePath = Fixes.getFixesStoreStoragePath()
        if acct.storage
            .borrow<auth(Fixes.Manage) &Fixes.InscriptionsStore>(from: storePath) == nil {
            acct.storage.save(<- Fixes.createInscriptionsStore(), to: storePath)
        }

        let store = acct.storage
            .borrow<auth(Fixes.Manage) &Fixes.InscriptionsStore>(from: storePath)
            ?? panic("Could not borrow a reference to the Inscriptions Store!")
        /** ------------- End -------------------------------------------------- */

        /** ------------- Start -- FRC20 Marketplace -------------  */
        // Borrow a reference to the FRC20Marketplace contract
        self.market = FRC20MarketManager.borrowMarket(tick)
            ?? panic("Could not borrow reference to the FRC20Market")

        assert(
            self.market.getTickerName() == tick,
            message: "The market is not for the FRC20 token with tick ".concat(tick)
        )
        assert(
            self.market.canAccess(addr: acct.address),
            message: "You are not allowed to access this market for now."
        )
        /** ------------- End -------------------------------------  */

        /** ------------- Start -- TradingRecords General Initialization -------------  */
        // Ensure hooks are initialized
        if acct.storage.borrow<&AnyResource>(from: FRC20FTShared.TransactionHookStoragePath) == nil {
            let hooks <- FRC20FTShared.createHooks()
            acct.storage.save(<- hooks, to: FRC20FTShared.TransactionHookStoragePath)
        }

        // link the hooks to the public path
        if acct
            .capabilities.get<&FRC20FTShared.Hooks>(FRC20FTShared.TransactionHookPublicPath)
            .borrow() == nil {
            // link the hooks to the public path
            acct.capabilities.unpublish(FRC20FTShared.TransactionHookPublicPath)
            acct.capabilities.publish(
                acct.capabilities.storage.issue<&FRC20FTShared.Hooks>(FRC20FTShared.TransactionHookStoragePath),
                at: FRC20FTShared.TransactionHookPublicPath
            )
        }

        // borrow the hooks reference
        let hooksRef = acct.storage
            .borrow<auth(FRC20FTShared.Manage) &FRC20FTShared.Hooks>(from: FRC20FTShared.TransactionHookStoragePath)
            ?? panic("The hooks were not created")

        // Ensure Trading Records is initialized
        if acct.storage.borrow<&AnyResource>(from: FRC20TradingRecord.TradingRecordsStoragePath) == nil {
            let tradingRecords <- FRC20TradingRecord.createTradingRecords(nil)
            acct.storage.save(<- tradingRecords, to: FRC20TradingRecord.TradingRecordsStoragePath)
            // link the trading records to the public path
            acct.capabilities.unpublish(FRC20TradingRecord.TradingRecordsPublicPath)
            acct.capabilities.publish(
                acct.capabilities.storage.issue<&FRC20TradingRecord.TradingRecords>(FRC20TradingRecord.TradingRecordsStoragePath),
                at: FRC20TradingRecord.TradingRecordsPublicPath
            )
        }

        // Ensure trading record hook is added to the hooks
        // get the public capability of the trading record hook
        let tradingRecordsCap = acct
            .capabilities.get<&FRC20TradingRecord.TradingRecords>(
                FRC20TradingRecord.TradingRecordsPublicPath
            )
        assert(tradingRecordsCap.check(), message: "The trading record hook is not valid")
        // get the reference of the trading record hook
        let recordsRef = tradingRecordsCap.borrow() ?? panic("The trading record hook is not valid")
        if !hooksRef.hasHook(recordsRef.getType()) {
            hooksRef.addHook(tradingRecordsCap)
        }

        // Ensure Fixes Avatar is initialized
        if acct.storage.borrow<&AnyResource>(from: FixesAvatar.AvatarStoragePath) == nil {
            acct.storage.save(<- FixesAvatar.createProfile(), to: FixesAvatar.AvatarStoragePath)
            // link the avatar to the public path
            acct.capabilities.unpublish(FixesAvatar.AvatarPublicPath)
            acct.capabilities.publish(
                acct.capabilities.storage.issue<&FixesAvatar.Profile>(FixesAvatar.AvatarStoragePath),
                at: FixesAvatar.AvatarPublicPath
            )
        }
        let profileCap = FixesAvatar.getProfileCap(acct.address)
        assert(profileCap.check(), message: "The profile is not valid")
        let profileRef = profileCap.borrow() ?? panic("The profile is not valid")
        if !hooksRef.hasHook(profileRef.getType()) {
            hooksRef.addHook(profileCap)
        }
        /** ------------- End -----------------------------------------------------------------  */

        // Get a reference to the signer's stored vault
        let vaultRef = acct.storage
            .borrow<auth(FungibleToken.Withdraw) &FlowToken.Vault>(from: /storage/flowTokenVault)
            ?? panic("Could not borrow reference to the owner's Vault!")

        // For each buy item, check the listing
        for rankedId in batchBuyItems.keys {
            /** ------------- Start -- FRC20 Storefront Initialization -------------  */
            let listedItem = self.market.getListedItemByRankdedId(rankedId: rankedId)
            // Do not panic for better UX
            if listedItem == nil {
                continue
            }
            let storefront = listedItem!.borrowStorefront()
            let listing = listedItem!.borrowListing()
            // Do not panic for better UX
            if storefront == nil || listing == nil {
                continue
            }
            let listingDetails = listing!.getDetails()
            // Do not panic for better UX
            if listingDetails.status != FRC20Storefront.ListingStatus.Available {
                continue
            }
            if listingDetails.type != FRC20Storefront.ListingType.FixedPriceBuyNow {
                continue
            }
            if listingDetails.tick != tick {
                continue
            }
            /** ------------- End --------------------------------------------------  */

            var commissionFlowRecipient: Capability<&FlowToken.Vault>? = nil
            if let receivers = listing!.getAllowedCommissionReceivers() {
                if receivers.length > 0 {
                    commissionFlowRecipient = receivers[0]
                    assert(commissionFlowRecipient!.check(), message: "Invalid commission recipient")
                }
            }

            let buyAmount = batchBuyItems[rankedId]!
            // calculate the buy price
            let buyPrice = listingDetails.totalPrice * buyAmount / listingDetails.amount

            /** ------------- Start -- Inscription Initialization -------------  */
            // create the metadata
            let dataStr = FixesInscriptionFactory.buildMarketTakeBuyNow(tick: tick, amount: buyAmount)

            // estimate the required storage
            let estimatedReqValue = FixesInscriptionFactory.estimateFrc20InsribeCost(dataStr)

            // Withdraw tokens from the signer's stored vault
            // Total amount to withdraw is the estimated required value + the buy price
            let flowToReserve <- vaultRef.withdraw(amount: estimatedReqValue)

            // Create the Inscription first
            let newInsId = FixesInscriptionFactory.createAndStoreFrc20Inscription(
                dataStr,
                <- (flowToReserve as! @FlowToken.Vault),
                store
            )

            // borrow a reference to the new Inscription
            let insRef = store.borrowInscriptionWritableRef(newInsId)
                ?? panic("Could not borrow reference to the new Inscription!")

            // Deposit the payment flow vault to the inscription vault
            let payment <- vaultRef.withdraw(amount: buyPrice)
            insRef.deposit(<- (payment as! @FlowToken.Vault))

            /** ------------- End ---------------------------------------------  */

            // Execute the buy
            // execute taking
            listing?.takeBuyNow(ins: insRef, commissionRecipient: commissionFlowRecipient)

            // cleanup
            self.market.tryRemoveCompletedListing(rankedId: listedItem!.rankedId)
        }
    }

    execute {
        log("Done: user take as buyer with commission")
    }
}

Related docs

• EstimateCost - read

• How to send a transaction to Flow blockchain or query data from Flow blockchain?
• Query 𝔉rc20 Listings