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processTransaction.js
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processTransaction.js
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function processTransaction(transaction) {
var collection = getContext().getCollection();
var accountId = collection.getAltLink() + '/docs/' + transaction.accountId;
// Read account document
var isAccepted = collection.readDocument(
accountId, {},
function (err, accountSummary) {
if (err) throw err;
// Check operation type
if (transaction.type.toLowerCase() == "debit") {
if ((accountSummary.balance + accountSummary.limit) < transaction.amount) {
throw "Insufficient balance/limit!";
}
else {
accountSummary.balance -= transaction.amount;
}
}
else if (transaction.type.toLowerCase() == "deposit") {
accountSummary.balance += transaction.amount;
}
// Provide eTag to handle concurrency
var requestOptions = { etag: accountSummary._etag };
// Replace account document with updated balance
var isAccepted = collection.replaceDocument(accountSummary._self, accountSummary, requestOptions, function (err, updatedDocument) {
if (err) throw err;
// Create transaction document once replace succeeded
var isAccepted = collection.createDocument(collection.getSelfLink(), transaction, function (err, doc) {
if (err) throw err;
});
// Return update account details
getContext().getResponse().setBody(accountSummary);
});
});
if (!isAccepted) throw new Error('The query was not accepted by the server.');
};