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DEX trade code: interpret metadata

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mDuo13
2022-04-01 14:37:33 -07:00
parent 4be8c322dd
commit d286614c6a
3 changed files with 83 additions and 7 deletions
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1
content/_code-samples/trade-in-the-decentralized-exchange/js/demo.html
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@@ -4,6 +4,7 @@
<meta charset="utf-8" /> <meta charset="utf-8" />
<title>Code Sample - Trade in the Decentralized Exchange</title> <title>Code Sample - Trade in the Decentralized Exchange</title>
<script src="https://unpkg.com/xrpl@2.0.0/build/xrpl-latest-min.js"></script> <script src="https://unpkg.com/xrpl@2.0.0/build/xrpl-latest-min.js"></script>
<script src='https://cdn.jsdelivr.net/npm/bignumber.js@9.0.2/bignumber.min.js'></script>
<script type="application/javascript" src="trade-in-the-dex.js"></script> <script type="application/javascript" src="trade-in-the-dex.js"></script>
</head> </head>
<body>Open your browser's console (F12) to see the logs.</body> <body>Open your browser's console (F12) to see the logs.</body>

3
content/_code-samples/trade-in-the-decentralized-exchange/js/package.json
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@@ -1,5 +1,6 @@
{ {
"dependencies": { "dependencies": {
"xrpl": "^2.1.0" "xrpl": "^2.1.0",
"bignumber.js": "^9.0.0"
} }
} }

86
content/_code-samples/trade-in-the-decentralized-exchange/js/trade-in-the-dex.js
View File

@@ -6,6 +6,7 @@
if (typeof module !== "undefined") { if (typeof module !== "undefined") {
// Use var here because const/let are block-scoped to the if statement. // Use var here because const/let are block-scoped to the if statement.
var xrpl = require('xrpl') var xrpl = require('xrpl')
var BigNumber = require('bignumber.js')
} }
// Connect --------------------------------------------------------------------- // Connect ---------------------------------------------------------------------
@@ -15,10 +16,10 @@ async function main() {
await client.connect() await client.connect()
// Get credentials from the Testnet Faucet ----------------------------------- // Get credentials from the Testnet Faucet -----------------------------------
// console.log("Requesting address from the Testnet faucet...") console.log("Requesting address from the Testnet faucet...")
// const wallet = (await client.fundWallet()).wallet const wallet = (await client.fundWallet()).wallet
// console.log(`Got address ${wallet.address}.`) console.log(`Got address ${wallet.address}.`)
const wallet = xrpl.Wallet.fromSeed("SEED VALUE HERE") // temp for testing: don't fund every time //const wallet = xrpl.Wallet.fromSeed("SEED VALUE HERE") // temp for testing: don't fund every time
// Define the proposed trade. // Define the proposed trade.
const we_want = { const we_want = {
@@ -59,7 +60,7 @@ async function main() {
console.log(`No Offers in the matching book. console.log(`No Offers in the matching book.
Offer probably won't execute immediately.`) Offer probably won't execute immediately.`)
} else { } else {
for (o of offers) { for (const o of offers) {
if (o.quality <= proposed_quality) { if (o.quality <= proposed_quality) {
console.log(`Matching Offer found, funded with ${o.owner_funds}`) console.log(`Matching Offer found, funded with ${o.owner_funds}`)
running_total += Number(o.owner_funds) running_total += Number(o.owner_funds)
@@ -109,7 +110,7 @@ async function main() {
if (!offers2) { if (!offers2) {
console.log(`No similar Offers in the book. Ours would be the first.`) console.log(`No similar Offers in the book. Ours would be the first.`)
} else { } else {
for (o of offers2) { for (const o of offers2) {
if (o.quality <= offered_quality) { if (o.quality <= offered_quality) {
console.log(`Existing offer found, funded with ${o.owner_funds}`) console.log(`Existing offer found, funded with ${o.owner_funds}`)
running_total2 += Number(o.owner_funds) running_total2 += Number(o.owner_funds)
@@ -153,6 +154,79 @@ async function main() {
throw `Error sending transaction: ${result}` throw `Error sending transaction: ${result}`
} }
// Interpret metadata --------------------------------------------------------
for (const affnode of result.result.meta.AffectedNodes) {
if (affnode.hasOwnProperty("ModifiedNode")) {
const mn = affnode.ModifiedNode
if (mn.LedgerEntryType == "AccountRoot") {
if (mn.FinalFields.Account == wallet.address) {
// Found our account in the metadata
const final_xrp_bal = mn.FinalFields.Balance
const prev_xrp_bal = mn.PreviousFields.Balance
if (prev_xrp_bal === undefined) {
console.log(`Total XRP balance unchanged. This usually means the
transaction acquired exactly enough XRP to offset the XRP burned
as a transaction cost. Balance = ${xrpl.dropsToXrp(final_xrp_bal)} XRP`)
} else {
const diff_drops = BigNumber(final_xrp_bal) - BigNumber(prev_xrp_bal)
console.log(`Changed XRP balance by ${xrpl.dropsToXrp(diff_drops)}
to a new value of ${xrpl.dropsToXrp(final_xrp_bal)} XRP. (This
includes the net effect of burning XRP as a transaction cost.)`)
}
}
} else if (mn.LedgerEntryType == "RippleState") {
if (mn.FinalFields.HighLimit.issuer == wallet.address ||
mn.FinalFields.LowLimit.issuer == wallet.address) {
// Modified a trust line we already had
const we_are_low = (mn.FinalFields.LowLimit.issuer == wallet.address)
const currency = mn.FinalFields.Balance.currency
let counterparty
if (we_are_low) {
counterparty = mn.FinalFields.HighLimit.issuer
} else {
counterparty = mn.FinalFields.LowLimit.issuer
}
const final_token_bal = mn.FinalFields.Balance.value
const prev_token_bal = mn.PreviousFields.Balance.value
if (prev_token_bal === undefined) {
console.log(`Balance of ${currency}.${counterparty} unchanged.`)
} else {
let final_bal = BigNumber(final_token_bal)
let diff_tokens = final_bal - BigNumber(prev_token_bal)
if (!we_are_low) {
// RippleState objects store the balance from the low account's
// perspective, so if we are the high account, we negate it to get
// the balance from our perspective instead.
final_bal = -final_bal
diff_tokens = -diff_tokens
}
console.log(`Balance of ${currency}.${counterparty} changed by
${diff_tokens} to a final value of ${final_bal}.`)
}
}
}
} else if (affnode.hasOwnProperty("CreatedNode")) {
const cn = affnode.CreatedNode
if (cn.LedgerEntryType == "Offer") {
console.log(`Created Offer with TakerPays=${cn.NewFields.TakerPays}
and TakerGets=${cn.NewFields.TakerGets}.`)
} else if (cn.LedgerEntryType == "RippleState") {
if (cn.NewFields.HighLimit.issuer == wallet.address ||
cn.NewFields.LowLimit.issuer == wallet.address) {
const we_are_low = (cn.NewFields.LowLimit.issuer == wallet.address)
let balance = cn.NewFields.Balance.value
if (!we_are_low) {
balance = -balance
}
console.log(`Created ${cn.NewFields.Balance.currency} trust line
between ${cn.NewFields.LowLimit.issuer} and
${cn.NewFields.HighLimit.issuer} with starting balance
${balance}.`)
}
}
}
}
// Check balances ------------------------------------------------------------ // Check balances ------------------------------------------------------------
console.log("Getting address balances...") console.log("Getting address balances...")
const balances = await client.request({ const balances = await client.request({