ifl-744 add test/updates for calculating raw transaction size

ironfish-rust-nodejs/src/structs/note_encrypted.rs

@@ -28,12 +28,6 @@ pub const ENCRYPTED_NOTE_PLAINTEXT_LENGTH: u32 = ENCRYPTED_NOTE_SIZE as u32 + MA
 #[napi]
 pub const ENCRYPTED_NOTE_LENGTH: u32 =
     NOTE_ENCRYPTION_KEY_LENGTH + ENCRYPTED_NOTE_PLAINTEXT_LENGTH + 96;
-//  32 value commitment
-//+ 32 note commitment
-//+ 32 ephemeral public key
-//+ 120 encrypted note
-//+ 80 note encryption keys
-//= 296 bytes
 
 #[napi(js_name = "NoteEncrypted")]
 pub struct NativeNoteEncrypted {

ironfish/src/primitives/__fixtures__/rawTransaction.test.ts.fixture

@@ -196,5 +196,44 @@
       "publicAddress": "c96cc22b0a0e958c055eb6b357418e4a779b90f85750dfc9e618b36688eab944",
       "createdAt": null
     }
+  ],
+  "RawTransaction should equal": [
+    {
+      "version": 2,
+      "id": "fb52a88e-3e8c-466f-bd34-c4dd7d75532d",
+      "name": "test",
+      "spendingKey": "4c3d51b6596832c4dc539aa5d6ecd036d338fbc21b6a64d26a7ccc838a87a000",
+      "viewKey": "a33795eafe7851f52fc4bfbe2a2ff60ad7bb409d6cc4bc19996a4d941a4f8cc526aee6da70f63bcac90ec4bd678b16bbe64299bed09da120bf28e321d3aab1aa",
+      "incomingViewKey": "cee508b90f3963e4099798a355ed0da0e123b193ff0f7cd6b7b4596caadf1e02",
+      "outgoingViewKey": "79f6d37e22fd3d9ca88b0d26a1dedebb4ef7e89fa31ac7632c1ee06a3f30628a",
+      "publicAddress": "6b971b1e7217ff4fe81c457c65d85ce8d7723fa52061a2194041efb556a99c19",
+      "createdAt": null
+    },
+    {
+      "header": {
+        "sequence": 2,
+        "previousBlockHash": "88B6FA8D745A4E53BDA001318E60B04EE2E4EE06A38095688D58049CB6F15ACA",
+        "noteCommitment": {
+          "type": "Buffer",
+          "data": "base64:9DdIBOwIdxNRoPgyIcDSxyCQwTV2oALwWD2w/K2dPEM="
+        },
+        "transactionCommitment": {
+          "type": "Buffer",
+          "data": "base64:v2mDXwx+HgVnlnZwDaTJfEzBSmmEHpHcvjPYjXbGJOg="
+        },
+        "target": "883423532389192164791648750371459257913741948437809479060803100646309888",
+        "randomness": "0",
+        "timestamp": 1682541250417,
+        "graffiti": "0000000000000000000000000000000000000000000000000000000000000000",
+        "noteSize": 4,
+        "work": "0"
+      },
+      "transactions": [
+        {
+          "type": "Buffer",
+          "data": "base64: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"
+        }
+      ]
+    }
   ]
 }

ironfish/src/primitives/rawTransaction.test.ts

@@ -84,6 +84,10 @@ describe('RawTransaction', () => {
     const mintedValue = valuesByAsset.get(asset.id())
     Assert.isNotUndefined(mintedValue)
     expect(mintedValue).toEqual(1n)
+
+    // should have same size for posted transaction and estimated size from raw transaction
+    const serializedPost = posted.serialize()
+    expect(raw.postedSize(account.publicAddress)).toEqual(serializedPost.byteLength)
   })
 
   it('should throw an error if the max mint value is exceeded', async () => {

ironfish/src/primitives/rawTransaction.ts

@@ -6,16 +6,20 @@ import {
   AMOUNT_VALUE_LENGTH,
   ASSET_LENGTH,
   generateKeyFromPrivateKey,
+  PROOF_LENGTH,
   Transaction as NativeTransaction,
   TRANSACTION_EXPIRATION_LENGTH,
   TRANSACTION_FEE_LENGTH,
+  TRANSACTION_PUBLIC_KEY_RANDOMNESS_LENGTH,
+  TRANSACTION_SIGNATURE_LENGTH,
 } from '@ironfish/rust-nodejs'
 import { Asset, ASSET_ID_LENGTH } from '@ironfish/rust-nodejs'
 import bufio from 'bufio'
 import { Witness } from '../merkletree'
 import { NoteHasher } from '../merkletree/hasher'
 import { Side } from '../merkletree/merkletree'
 import { CurrencyUtils } from '../utils/currency'
+import { AssetBalances } from '../wallet/assetBalances'
 import { BurnDescription } from './burnDescription'
 import { Note } from './note'
 import {
@@ -54,17 +58,44 @@ export class RawTransaction {
     >
   }[] = []
 
-  size(): number {
+  postedSize(publicAddress: string): number {
     let size = 0
+    size += 1 // version
     size += 8 // spends length
     size += 8 // notes length
-    size += 8 // fee
-    size += 4 // expiration
-    size += 64 // signature
+    size += 8 // mints length
+    size += 8 // burns length
+    size += TRANSACTION_FEE_LENGTH // fee
+    size += TRANSACTION_EXPIRATION_LENGTH // expiration
+    size += TRANSACTION_PUBLIC_KEY_RANDOMNESS_LENGTH // public key randomness
+    size += this.spends.length * SPEND_SERIALIZED_SIZE_IN_BYTE
     size += this.outputs.length * NOTE_ENCRYPTED_SERIALIZED_SIZE_IN_BYTE
-    size += this.mints.length * (ASSET_LENGTH + 8)
+    size +=
+      this.mints.length *
+      (PROOF_LENGTH + ASSET_LENGTH + AMOUNT_VALUE_LENGTH + TRANSACTION_SIGNATURE_LENGTH)
     size += this.burns.length * (ASSET_ID_LENGTH + 8)
-    size += this.spends.length * SPEND_SERIALIZED_SIZE_IN_BYTE
+    size += TRANSACTION_SIGNATURE_LENGTH // signature
+
+    // Each asset might have a change note, which would need to be accounted for
+    const assetTotals = new AssetBalances()
+    for (const mint of this.mints) {
+      const asset = new Asset(publicAddress, mint.name, mint.metadata)
+      assetTotals.increment(asset.id(), mint.value)
+    }
+    for (const burn of this.burns) {
+      assetTotals.increment(burn.assetId, -burn.value)
+    }
+    for (const spend of this.spends) {
+      assetTotals.increment(spend.note.assetId(), -spend.note.value())
+    }
+    for (const output of this.outputs) {
+      assetTotals.increment(output.note.assetId(), output.note.value())
+    }
+    for (const [, value] of assetTotals) {
+      if (value !== 0n) {
+        size += NOTE_ENCRYPTED_SERIALIZED_SIZE_IN_BYTE
+      }
+    }
     return size
   }
 

ironfish/src/primitives/spend.ts

@@ -4,7 +4,7 @@
 
 import { Nullifier } from './nullifier'
 
-export const SPEND_SERIALIZED_SIZE_IN_BYTE = 388
+export const SPEND_SERIALIZED_SIZE_IN_BYTE = 356
 
 export interface Spend {
   nullifier: Nullifier

ironfish/src/primitives/transaction.ts

@@ -59,7 +59,7 @@ export class Transaction {
 
     // spend description
     this.spends = Array.from({ length: _spendsLength }, () => {
-      // proof
+      // proof 192
       reader.seek(PROOF_LENGTH)
       // value commitment
       reader.seek(32)
@@ -68,10 +68,10 @@ export class Transaction {
       const treeSize = reader.readU32() // 4
       const nullifier = reader.readHash() // 32
 
-      // signature
+      // signature 64
       reader.seek(TRANSACTION_SIGNATURE_LENGTH)
 
-      // total serialized size: 192 + 32 + 32 + 32 + 4 + 32 + 64 = 388 bytes
+      // total serialized size: 192 + 32 + 32 + 4 + 32 + 64 = 356 bytes
       return {
         size: treeSize,
         commitment: rootHash,

ironfish/src/wallet/wallet.ts

@@ -918,7 +918,7 @@ export class Wallet {
       }
 
       if (options.feeRate) {
-        raw.fee = getFee(options.feeRate, raw.size())
+        raw.fee = getFee(options.feeRate, raw.postedSize(options.account.publicAddress))
       }
 
       await this.fund(raw, {
@@ -928,7 +928,7 @@ export class Wallet {
       })
 
       if (options.feeRate) {
-        raw.fee = getFee(options.feeRate, raw.size())
+        raw.fee = getFee(options.feeRate, raw.postedSize(options.account.publicAddress))
         raw.spends = []
 
         await this.fund(raw, {