fix(Transaction.get): Using BigNumber for better tokenqty calc

src/transaction.js

@@ -4,6 +4,7 @@
 
 const RawTransaction = require('./raw-transactions')
 const SlpUtils = require('./slp/utils')
+const BigNumber = require('bignumber.js')
 
 class Transaction {
   constructor (config) {
@@ -43,7 +44,7 @@ class Transaction {
       }
 
       const txDetails = await this.rawTransaction.getTxData(txid)
-      console.log(`txDetails: ${JSON.stringify(txDetails, null, 2)}`)
+      // console.log(`txDetails: ${JSON.stringify(txDetails, null, 2)}`)
 
       // Setup default SLP properties.
       txDetails.isValidSLPTx = false
@@ -53,7 +54,7 @@ class Transaction {
       let outTokenData
       try {
         outTokenData = await this.slpUtils.decodeOpReturn(txid)
-        console.log(`outTokenData: ${JSON.stringify(outTokenData, null, 2)}`)
+        // console.log(`outTokenData: ${JSON.stringify(outTokenData, null, 2)}`)
 
         // Get Genesis data for this token.
         const genesisData = await this.slpUtils.decodeOpReturn(
@@ -61,7 +62,7 @@ class Transaction {
           // decodeOpReturnCache
           // usrObj // pass user data when making an internal call.
         )
-        console.log(`genesisData: ${JSON.stringify(genesisData, null, 2)}`)
+        // console.log(`genesisData: ${JSON.stringify(genesisData, null, 2)}`)
 
         // Add token information to the tx details object.
         txDetails.tokenTxType = outTokenData.txType
@@ -75,9 +76,18 @@ class Transaction {
         // Add the token quantity to each output.
         for (let i = 0; i < outTokenData.amounts.length; i++) {
           const rawQty = outTokenData.amounts[i]
-          const realQty = Number(rawQty) / Math.pow(10, txDetails.tokenDecimals)
+          // const realQty = Number(rawQty) / Math.pow(10, txDetails.tokenDecimals)
 
-          txDetails.vout[i + 1].tokenQty = realQty
+          // Calculate the real quantity using a BigNumber, then convert it to a
+          // floating point number.
+          let realQty = new BigNumber(rawQty).dividedBy(
+            10 ** parseInt(txDetails.tokenDecimals)
+          )
+          realQty = realQty.toString()
+          // realQty = parseFloat(realQty)
+
+          txDetails.vout[i + 1].tokenQtyStr = realQty
+          txDetails.vout[i + 1].tokenQty = parseFloat(realQty)
         }
 
         // Add tokenQty = null to any outputs that don't have a value.
@@ -97,9 +107,9 @@ class Transaction {
             // If decodeOpReturn() throws an error, then this input is not
             // from an SLP transaction and can be ignored.
             const inTokenData = await this.slpUtils.decodeOpReturn(thisVin.txid)
-            console.log(
-              `vin[${i}] tokenData: ${JSON.stringify(inTokenData, null, 2)}`
-            )
+            // console.log(
+            //   `vin[${i}] tokenData: ${JSON.stringify(inTokenData, null, 2)}`
+            // )
 
             let tokenQty = 0
             if (inTokenData.txType === 'SEND') {
@@ -107,25 +117,40 @@ class Transaction {
               // which means this Vin is not actually a token UTXO, it was just
               // associated with a previous token TX.
               tokenQty = inTokenData.amounts[thisVin.vout - 1]
-              console.log(`tokenQty: ${JSON.stringify(tokenQty, null, 2)}`)
+              // console.log(`tokenQty: ${JSON.stringify(tokenQty, null, 2)}`)
+
+              //
             } else if (inTokenData.txType === 'GENESIS') {
               // Only vout[1] of a Genesis transaction represents the tokens.
               // Any other outputs in that transaction are normal BCH UTXOs.
               if (thisVin.vout === 1) {
                 tokenQty = inTokenData.qty
-                console.log(`tokenQty: ${JSON.stringify(tokenQty, null, 2)}`)
+                // console.log(`tokenQty: ${JSON.stringify(tokenQty, null, 2)}`)
               }
+
+              //
             } else {
-              console.log('Unexpected code path. Is this a MINT transaction?')
+              console.log(
+                'Unexpected code path in Transaction.get(). Is this a MINT transaction?'
+              )
               console.log(inTokenData)
               throw new Error('Unexpected code path')
             }
 
             if (tokenQty) {
-              const realQty =
-                Number(tokenQty) / Math.pow(10, txDetails.tokenDecimals)
+              // const realQty =
+              //   Number(tokenQty) / Math.pow(10, txDetails.tokenDecimals)
 
-              thisVin.tokenQty = realQty
+              // Calculate the real quantity using a BigNumber, then convert it to a
+              // floating point number.
+              let realQty = new BigNumber(tokenQty).dividedBy(
+                10 ** parseInt(txDetails.tokenDecimals)
+              )
+              realQty = realQty.toString()
+              // realQty = parseFloat(realQty)
+
+              thisVin.tokenQtyStr = realQty
+              thisVin.tokenQty = parseFloat(realQty)
               // txDetails.vin[i].tokenQty = tokenQty
             } else {
               thisVin.tokenQty = null

test/unit/transaction-unit.js

@@ -142,7 +142,7 @@ describe('#TransactionLib', () => {
         '874306bda204d3a5dd15e03ea5732cccdca4c33a52df35162cdd64e30ea7f04e'
 
       const result = await bchjs.Transaction.get(txid)
-      console.log(`result: ${JSON.stringify(result, null, 2)}`)
+      // console.log(`result: ${JSON.stringify(result, null, 2)}`)
 
       // Assert that there are stanardized properties.
       assert.property(result, 'txid')