refactoring in preparation for #4121
This commit is contained in:
Florian Dold
parent
164d5f20c3
commit
c34a6612ec
@ -259,6 +259,10 @@ function copy(o) {
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}
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/**
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* Rank two denomination by how desireable it is to withdraw them,
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* based on their fees and value.
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*/
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function rankDenom(denom1: any, denom2: any) {
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// Slow ... we should find a better way than to convert it evert time.
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let v1 = new native.Amount(denom1.value);
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@ -267,17 +271,112 @@ function rankDenom(denom1: any, denom2: any) {
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}
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/**
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* Create a pre-coin of the given denomination to be withdrawn from then given
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* reserve.
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*/
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function createPreCoin(denom: Denomination, reserve: Reserve): PreCoin {
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let reservePriv = new native.EddsaPrivateKey();
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reservePriv.loadCrock(reserve.reserve_priv);
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let reservePub = new native.EddsaPublicKey();
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reservePub.loadCrock(reserve.reserve_pub);
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let denomPub = native.RsaPublicKey.fromCrock(denom.denom_pub);
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let coinPriv = native.EddsaPrivateKey.create();
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let coinPub = coinPriv.getPublicKey();
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let blindingFactor = native.RsaBlindingKey.create(1024);
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let pubHash: native.HashCode = coinPub.hash();
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let ev: native.ByteArray = native.rsaBlind(pubHash,
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blindingFactor,
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denomPub);
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if (!denom.fee_withdraw) {
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throw Error("Field fee_withdraw missing");
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}
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let amountWithFee = new native.Amount(denom.value);
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amountWithFee.add(new native.Amount(denom.fee_withdraw));
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let withdrawFee = new native.Amount(denom.fee_withdraw);
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// Signature
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let withdrawRequest = new native.WithdrawRequestPS({
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reserve_pub: reservePub,
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amount_with_fee: amountWithFee.toNbo(),
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withdraw_fee: withdrawFee.toNbo(),
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h_denomination_pub: denomPub.encode().hash(),
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h_coin_envelope: ev.hash()
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});
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var sig = native.eddsaSign(withdrawRequest.toPurpose(), reservePriv);
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let preCoin: PreCoin = {
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reservePub: reservePub.toCrock(),
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blindingKey: blindingFactor.toCrock(),
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coinPub: coinPub.toCrock(),
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coinPriv: coinPriv.toCrock(),
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denomPub: denomPub.encode().toCrock(),
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mintBaseUrl: reserve.mint_base_url,
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withdrawSig: sig.toCrock(),
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coinEv: ev.toCrock(),
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coinValue: denom.value
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};
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return preCoin;
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}
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/**
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* Get a list of denominations (with repetitions possible)
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* whose total value is as close as possible to the available
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* amount, but never larger.
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*/
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function getWithdrawDenomList(amountAvailable: AmountJson,
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denoms: Denomination[]): Denomination[] {
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let remaining = new native.Amount(amountAvailable);
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let ds: Denomination[] = [];
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denoms = denoms.filter(isWithdrawableDenom);
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denoms.sort(rankDenom);
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// This is an arbitrary number of coins
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// we can withdraw in one go. It's not clear if this limit
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// is useful ...
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for (let i = 0; i < 1000; i++) {
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let found = false;
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for (let d of denoms) {
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let cost = new native.Amount(d.value);
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cost.add(new native.Amount(d.fee_withdraw));
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if (remaining.cmp(cost) < 0) {
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continue;
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}
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found = true;
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remaining.sub(cost);
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ds.push(d);
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}
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if (!found) {
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console.log("did not find coins for remaining ", remaining.toJson());
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break;
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}
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}
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return ds;
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}
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export class Wallet {
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private db: IDBDatabase;
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private http: HttpRequestLibrary;
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private badge: Badge;
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constructor(db: IDBDatabase, http: HttpRequestLibrary, badge: Badge) {
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this.db = db;
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this.http = http;
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this.badge = badge;
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}
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/**
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* Generate updated coins (to store in the database)
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* and deposit permissions for each given coin.
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*/
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private static signDeposit(offer: Offer,
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cds: CoinWithDenom[]): PayCoinInfo {
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let ret = [];
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@ -304,7 +403,7 @@ export class Wallet {
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newAmount.sub(coinSpend);
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cd.coin.currentAmount = newAmount.toJson();
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let args: native.DepositRequestPS_Args = {
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let d = new native.DepositRequestPS({
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h_contract: native.HashCode.fromCrock(offer.H_contract),
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h_wire: native.HashCode.fromCrock(offer.contract.H_wire),
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amount_with_fee: coinSpend.toNbo(),
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@ -314,9 +413,7 @@ export class Wallet {
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refund_deadline: native.AbsoluteTimeNbo.fromTalerString(offer.contract.refund_deadline),
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timestamp: native.AbsoluteTimeNbo.fromTalerString(offer.contract.timestamp),
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transaction_id: native.UInt64.fromNumber(offer.contract.transaction_id),
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};
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let d = new native.DepositRequestPS(args);
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});
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let coinSig = native.eddsaSign(d.toPurpose(),
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native.EddsaPrivateKey.fromCrock(cd.coin.coinPriv))
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@ -338,15 +435,10 @@ export class Wallet {
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/**
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* Get mints and associated coins that are still spendable,
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* but only if the sum the coins' remaining value exceeds the payment amount.
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* @param paymentAmount
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* @param depositFeeLimit
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* @param allowedMints
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*/
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private getPossibleMintCoins(paymentAmount: AmountJson,
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depositFeeLimit: AmountJson,
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allowedMints: MintInfo[]): Promise<MintCoins> {
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let m: MintCoins = {};
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function storeMintCoin(mc) {
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@ -611,56 +703,6 @@ export class Wallet {
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}
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private withdrawPrepare(denom: Denomination,
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reserve: Reserve): Promise<PreCoin> {
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let reservePriv = new native.EddsaPrivateKey();
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reservePriv.loadCrock(reserve.reserve_priv);
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let reservePub = new native.EddsaPublicKey();
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reservePub.loadCrock(reserve.reserve_pub);
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let denomPub = native.RsaPublicKey.fromCrock(denom.denom_pub);
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let coinPriv = native.EddsaPrivateKey.create();
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let coinPub = coinPriv.getPublicKey();
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let blindingFactor = native.RsaBlindingKey.create(1024);
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let pubHash: native.HashCode = coinPub.hash();
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let ev: native.ByteArray = native.rsaBlind(pubHash,
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blindingFactor,
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denomPub);
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if (!denom.fee_withdraw) {
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throw Error("Field fee_withdraw missing");
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}
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let amountWithFee = new native.Amount(denom.value);
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amountWithFee.add(new native.Amount(denom.fee_withdraw));
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let withdrawFee = new native.Amount(denom.fee_withdraw);
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// Signature
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let withdrawRequest = new native.WithdrawRequestPS({
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reserve_pub: reservePub,
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amount_with_fee: amountWithFee.toNbo(),
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withdraw_fee: withdrawFee.toNbo(),
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h_denomination_pub: denomPub.encode().hash(),
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h_coin_envelope: ev.hash()
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});
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var sig = native.eddsaSign(withdrawRequest.toPurpose(), reservePriv);
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let preCoin: PreCoin = {
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reservePub: reservePub.toCrock(),
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blindingKey: blindingFactor.toCrock(),
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coinPub: coinPub.toCrock(),
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coinPriv: coinPriv.toCrock(),
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denomPub: denomPub.encode().toCrock(),
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mintBaseUrl: reserve.mint_base_url,
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withdrawSig: sig.toCrock(),
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coinEv: ev.toCrock(),
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coinValue: denom.value
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};
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return Query(this.db).put("precoins", preCoin).finish().then(() => preCoin);
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}
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private withdrawExecute(pc: PreCoin): Promise<Coin> {
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return Query(this.db)
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.get("reserves", pc.reservePub)
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@ -736,9 +778,15 @@ export class Wallet {
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}
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private withdraw(denom, reserve): Promise<void> {
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return this.withdrawPrepare(denom, reserve)
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.then((pc) => this.withdrawExecute(pc))
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/**
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* Withdraw one coins of the given denomination from the given reserve.
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*/
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private withdraw(denom: Denomination, reserve: Reserve): Promise<void> {
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let preCoin = createPreCoin(denom, reserve);
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return Query(this.db)
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.put("precoins", preCoin)
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.finish()
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.then(() => this.withdrawExecute(preCoin))
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.then((c) => this.storeCoin(c));
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}
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@ -747,55 +795,26 @@ export class Wallet {
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* Withdraw coins from a reserve until it is empty.
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*/
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private depleteReserve(reserve, mint: Mint): Promise<void> {
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let denoms: Denomination[] = copy(mint.keys.denoms);
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let remaining = new native.Amount(reserve.current_amount);
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let denomsAvailable: Denomination[] = copy(mint.keys.denoms);
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let denomsForWithdraw = getWithdrawDenomList(reserve.current_amount,
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denomsAvailable);
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denoms = denoms.filter(isWithdrawableDenom);
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denoms.sort(rankDenom);
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let workList = [];
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for (let i = 0; i < 1000; i++) {
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let found = false;
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for (let d of denoms) {
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let cost = new native.Amount(d.value);
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cost.add(new native.Amount(d.fee_withdraw));
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if (remaining.cmp(cost) < 0) {
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continue;
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}
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found = true;
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remaining.sub(cost);
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workList.push(d);
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}
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if (!found) {
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console.log("did not find coins for remaining ", remaining.toJson());
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break;
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}
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}
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return new Promise<void>((resolve, reject) => {
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// Do the request one by one.
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let next = () => {
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if (workList.length == 0) {
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resolve();
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return;
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}
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let d = workList.pop();
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console.log("withdrawing", JSON.stringify(d));
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this.withdraw(d, reserve)
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.then(() => next())
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.catch((e) => {
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console.log("Failed to withdraw coin", e.stack);
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reject();
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let ps = denomsForWithdraw.map((denom) => {
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console.log("withdrawing", JSON.stringify(denom));
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// Do the withdraw asynchronously, so crypto is interleaved
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// with requests
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return this.withdraw(denom, reserve);
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});
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};
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// Asynchronous recursion
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next();
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});
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return Promise.all(ps).then(() => void 0);
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}
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private updateReserve(reservePub: string, mint): Promise<Reserve> {
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/**
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* Update the information about a reserve that is stored in the wallet
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* by quering the reserve's mint.
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*/
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private updateReserve(reservePub: string, mint: Mint): Promise<Reserve> {
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return Query(this.db)
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.get("reserves", reservePub)
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.then((reserve) => {
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@ -854,6 +873,10 @@ export class Wallet {
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}
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/**
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* Retrieve a mapping from currency name to the amount
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* that is currenctly available for spending in the wallet.
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*/
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getBalances(): Promise<any> {
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function collectBalances(c: Coin, byCurrency) {
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let acc: AmountJson = byCurrency[c.currentAmount.currency];
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@ -872,7 +895,10 @@ export class Wallet {
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}
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getHistory() {
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/**
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* Retrive the full event history for this wallet.
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*/
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getHistory(): Promise<any[]> {
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function collect(x, acc) {
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acc.push(x);
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return acc;
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