Merge pull request #1914 from MetaMask/history-diff

Move Tx State History to diff-based format

8 files changed, 3211 insertions, 26 deletions

diff --git a/app/scripts/controllers/transactions.js b/app/scripts/controllers/transactions.js
index 58c468e22..1bcee60ab 100644
--- a/app/scripts/controllers/transactions.js
+++ b/app/scripts/controllers/transactions.js
@@ -1,6 +1,5 @@
 const EventEmitter = require('events')
 const extend = require('xtend')
-const clone = require('clone')
 const ObservableStore = require('obs-store')
 const ethUtil = require('ethereumjs-util')
 const EthQuery = require('ethjs-query')
@@ -8,6 +7,7 @@ const TxProviderUtil = require('../lib/tx-utils')
 const PendingTransactionTracker = require('../lib/pending-tx-tracker')
 const createId = require('../lib/random-id')
 const NonceTracker = require('../lib/nonce-tracker')
+const txStateHistoryHelper = require('../lib/tx-state-history-helper')
 
 module.exports = class TransactionController extends EventEmitter {
   constructor (opts) {
@@ -128,19 +128,17 @@ module.exports = class TransactionController extends EventEmitter {
 
   updateTx (txMeta) {
     // create txMeta snapshot for history
-    const txMetaForHistory = clone(txMeta)
-    // dont include previous history in this snapshot
-    delete txMetaForHistory.history
-    // add snapshot to tx history
-    if (!txMeta.history) txMeta.history = []
-    txMeta.history.push(txMetaForHistory)
-
+    const currentState = txStateHistoryHelper.snapshotFromTxMeta(txMeta)
+    // recover previous tx state obj
+    const previousState = txStateHistoryHelper.replayHistory(txMeta.history)
+    // generate history entry and add to history
+    const entry = txStateHistoryHelper.generateHistoryEntry(previousState, currentState)
+    txMeta.history.push(entry)
+
+    // commit txMeta to state
     const txId = txMeta.id
     const txList = this.getFullTxList()
     const index = txList.findIndex(txData => txData.id === txId)
-    if (!txMeta.history) txMeta.history = []
-    txMeta.history.push(txMetaForHistory)
-
     txList[index] = txMeta
     this._saveTxList(txList)
     this.emit('update')
@@ -148,16 +146,22 @@ module.exports = class TransactionController extends EventEmitter {
 
   // Adds a tx to the txlist
   addTx (txMeta) {
-    const txCount = this.getTxCount()
-    const network = this.getNetwork()
-    const fullTxList = this.getFullTxList()
-    const txHistoryLimit = this.txHistoryLimit
+    // initialize history
+    txMeta.history = []
+    // capture initial snapshot of txMeta for history
+    const snapshot = txStateHistoryHelper.snapshotFromTxMeta(txMeta)
+    txMeta.history.push(snapshot)
 
     // checks if the length of the tx history is
     // longer then desired persistence limit
     // and then if it is removes only confirmed
     // or rejected tx's.
     // not tx's that are pending or unapproved
+    const txCount = this.getTxCount()
+    const network = this.getNetwork()
+    const fullTxList = this.getFullTxList()
+    const txHistoryLimit = this.txHistoryLimit
+
     if (txCount > txHistoryLimit - 1) {
       const index = fullTxList.findIndex((metaTx) => ((metaTx.status === 'confirmed' || metaTx.status === 'rejected') && network === txMeta.metamaskNetworkId))
       fullTxList.splice(index, 1)
@@ -206,7 +210,6 @@ module.exports = class TransactionController extends EventEmitter {
       status: 'unapproved',
       metamaskNetworkId: this.getNetwork(),
       txParams: txParams,
-      history: [],
     }
     // add default tx params
     await this.addTxDefaults(txMeta)
diff --git a/app/scripts/lib/tx-state-history-helper.js b/app/scripts/lib/tx-state-history-helper.js
new file mode 100644
index 000000000..304069d57
--- /dev/null
+++ b/app/scripts/lib/tx-state-history-helper.js
@@ -0,0 +1,37 @@
+const jsonDiffer = require('fast-json-patch')
+const clone = require('clone')
+
+module.exports = {
+  generateHistoryEntry,
+  replayHistory,
+  snapshotFromTxMeta,
+  migrateFromSnapshotsToDiffs,
+}
+
+
+function migrateFromSnapshotsToDiffs(longHistory) {
+  return (
+    longHistory
+    // convert non-initial history entries into diffs
+    .map((entry, index) => {
+      if (index === 0) return entry
+      return generateHistoryEntry(longHistory[index - 1], entry)
+    })
+  )
+}
+
+function generateHistoryEntry(previousState, newState) {
+  return jsonDiffer.compare(previousState, newState)
+}
+
+function replayHistory(shortHistory) {
+  return shortHistory.reduce((val, entry) => jsonDiffer.applyPatch(val, entry).newDocument)
+}
+
+function snapshotFromTxMeta(txMeta) {
+  // create txMeta snapshot for history
+  const snapshot = clone(txMeta)
+  // dont include previous history in this snapshot
+  delete snapshot.history
+  return snapshot
+}
\ No newline at end of file
diff --git a/app/scripts/migrations/018.js b/app/scripts/migrations/018.js
new file mode 100644
index 000000000..d27fe3f46
--- /dev/null
+++ b/app/scripts/migrations/018.js
@@ -0,0 +1,52 @@
+const version = 18
+
+/*
+
+This migration updates "transaction state history" to diffs style
+
+*/
+
+const clone = require('clone')
+const txStateHistoryHelper = require('../lib/tx-state-history-helper')
+
+
+module.exports = {
+  version,
+
+  migrate: function (originalVersionedData) {
+    const versionedData = clone(originalVersionedData)
+    versionedData.meta.version = version
+    try {
+      const state = versionedData.data
+      const newState = transformState(state)
+      versionedData.data = newState
+    } catch (err) {
+      console.warn(`MetaMask Migration #${version}` + err.stack)
+    }
+    return Promise.resolve(versionedData)
+  },
+}
+
+function transformState (state) {
+  const newState = state
+  const transactions = newState.TransactionController.transactions
+  newState.TransactionController.transactions = transactions.map((txMeta) => {
+    // no history: initialize
+    if (!txMeta.history || txMeta.history.length === 0) {
+      const snapshot = txStateHistoryHelper.snapshotFromTxMeta(txMeta)
+      txMeta.history = [snapshot]
+      return txMeta
+    }
+    // has history: migrate
+    const newHistory = (
+      txStateHistoryHelper.migrateFromSnapshotsToDiffs(txMeta.history)
+      // remove empty diffs
+      .filter((entry) => {
+        return !Array.isArray(entry) || entry.length > 0
+      })
+    )
+    txMeta.history = newHistory
+    return txMeta
+  })
+  return newState
+}
diff --git a/app/scripts/migrations/index.js b/app/scripts/migrations/index.js
index f4c87499f..6bfc622f7 100644
--- a/app/scripts/migrations/index.js
+++ b/app/scripts/migrations/index.js
@@ -28,4 +28,5 @@ module.exports = [
   require('./015'),
   require('./016'),
   require('./017'),
+  require('./018'),
 ]
diff --git a/package.json b/package.json
index 20170272a..9a09e6305 100644
--- a/package.json
+++ b/package.json
@@ -82,6 +82,7 @@
     "express": "^4.14.0",
     "extension-link-enabler": "^1.0.0",
     "extensionizer": "^1.0.0",
+    "fast-json-patch": "^2.0.4",
     "fast-levenshtein": "^2.0.6",
     "gulp": "github:gulpjs/gulp#4.0",
     "gulp-eslint": "^4.0.0",
diff --git a/test/data/v17-long-history.json b/test/data/v17-long-history.json
new file mode 100644
index 000000000..a33d425f8
--- /dev/null
+++ b/test/data/v17-long-history.json
@@ -0,0 +1,3053 @@
+{
+  "meta": {
+    "version": 17
+  },
+  "data": {
+    "config": {},
+    "NetworkController": {
+      "provider": {
+        "type": "ropsten",
+        "rpcTarget": "https://ropsten.infura.io/metamask"
+      },
+      "network": "3"
+    },
+    "NoticeController": {
+      "noticesList": [
+        {
+          "read": true,
+          "date": "Thu Feb 09 2017",
+          "title": "Terms of Use",
+          "body": "",
+          "id": 0
+        },
+        {
+          "read": true,
+          "date": "Mon May 08 2017",
+          "title": "Privacy Notice",
+          "body": "",
+          "id": 2
+        }
+      ]
+    },
+    "CurrencyController": {
+      "currentCurrency": "USD",
+      "conversionRate": 295.81988556,
+      "conversionDate": 1502734981
+    },
+    "KeyringController": {
+      "vault": "{\"data\":\"fFwVD3Msyq1o9NsDbjMlyJ1ZfoMcqfTgjR9cium0C5Vnpk9IM6f/RTVXfk0J4c4UkbgbKd++q8t1S+D22s7Ddz/BT/fe0GrbwPvAYQi1oJuOI9/Lf7I0JbESGv4PheijCIH4h/FiO+tIAuqM0Co3PULM4mOHdzXD8SWmzxbDGx+4wG84EQE9a1NEbqEjyqrX02h3NwZsjrSeuV5TibpGJB9vnKNpDu9wF0DVKLtLCG5n67uoTI/ve9Z7hIDa03vNi/71iE4avFb6ogE2SAkFDncEcU0xXVkBMapBXjrpe5sIq08Ddo0Hhi4fkd4yFW77sAH4TKzd6bWSn2AK8HL8Gpcrk4R6Cvv8EtyjUqsOJfE4AmYI6rWfFutLqEAp\",\"iv\":\"9fJ/OGDVwUnu3H0U71qOGA==\",\"salt\":\"5yGOu/+yrrb3DyP+cvMKIZqjhSjrEY+bnceHnz9n8gM=\"}",
+      "walletNicknames": {
+        "0x3ae39e89dc7e736cce53091057a45bf44b1a566c": "Account 1",
+        "0xa7a467edcb16a51976418ec6133f14f7939dc378": "Account 2",
+        "0x03ce38bd04b4ad7581a7070570381a530951ebbe": "Account 3"
+      }
+    },
+    "PreferencesController": {
+      "frequentRpcList": [],
+      "currentAccountTab": "history",
+      "tokens": [],
+      "selectedAddress": "0x3ae39e89dc7e736cce53091057a45bf44b1a566c"
+    },
+    "seedWords": null,
+    "InfuraController": {
+      "infuraNetworkStatus": {
+        "mainnet": "degraded",
+        "ropsten": "ok",
+        "kovan": "ok",
+        "rinkeby": "ok"
+      }
+    },
+    "BlacklistController": {
+      "phishing": {
+        "version": 2,
+        "tolerance": 2,
+        "fuzzylist": [
+          "metamask.io",
+          "myetherwallet.com"
+        ],
+        "whitelist": [
+          "metamask.io",
+          "myetherwallet.com",
+          "ethereum.org",
+          "myetheroll.com",
+          "myetherapi.com",
+          "ledgerwallet.com",
+          "etherscan.io",
+          "etherid.org",
+          "ether.cards",
+          "etheroll.com",
+          "ethnews.com",
+          "ethex.market",
+          "ethereumdev.io",
+          "ethereumdev.kr",
+          "dether.io",
+          "ethermine.org",
+          "slaask.com",
+          "etherbtc.io",
+          "ethereal.capital",
+          "etherisc.com",
+          "m.famalk.net",
+          "etherecho.com",
+          "ethereum.os.tc",
+          "theethereum.wiki",
+          "metajack.im",
+          "etherhub.io",
+          "ethereum.network",
+          "ethereum.link",
+          "ethereum.com",
+          "prethereum.org",
+          "ethereumj.io",
+          "etheraus.com",
+          "ethereum.dev",
+          "1ethereum.ru",
+          "ethereum.nz",
+          "nethereum.com",
+          "metabank.com",
+          "metamas.com",
+          "metabase.com"
+        ],
+        "blacklist": [
+          "numerai.tech",
+          "decentraiand.org",
+          "blockcrein.info",
+          "blockchealn.info",
+          "bllookchain.info",
+          "blockcbhain.info",
+          "myetherwallet.com.ethpromonodes.com",
+          "mettamask.io",
+          "tokenswap.org",
+          "netherum.com",
+          "etherexx.org",
+          "etherume.io",
+          "ethereum.plus",
+          "ehtereum.org",
+          "etereurm.org",
+          "etheream.com",
+          "ethererum.org",
+          "ethereum.io",
+          "0xtoken.com",
+          "cryptoalliance.herokuapp.com",
+          "bitspark2.com",
+          "indorsetoken.com",
+          "bittreat.com",
+          "iconexus.tk",
+          "iconexus.ml",
+          "iconexus.ga",
+          "iconexus.cf",
+          "etherwallet.online",
+          "wallet-ethereum.net",
+          "bitsdigit.com",
+          "etherswap.org",
+          "eos.ac",
+          "uasfwallet.com",
+          "ziber.io",
+          "multiply-ethereum.info",
+          "bittrex.comze.com",
+          "karbon.vacau.com",
+          "etherdelta.gitlhub.io",
+          "etherdelta.glthub.io",
+          "digitaldevelopersfund.vacau.com",
+          "district-0x.io",
+          "coin-dash.com",
+          "coindash.ru",
+          "district0x.net",
+          "aragonproject.io",
+          "coin-wallet.info",
+          "coinswallet.info",
+          "contribute-status.im",
+          "ether-api.com",
+          "ether-wall.com",
+          "mycoinwallet.net",
+          "ethereumchamber.com",
+          "ethereumchamber.net",
+          "ethereumchest.com",
+          "myetherweb.com.de",
+          "myetherieumwallet.com",
+          "myetehrwallet.com",
+          "myeterwalet.com",
+          "myetherwaiiet.com",
+          "myetherwallet.info",
+          "myetherwallet.ch",
+          "myetherwallet.om",
+          "myethervallet.com",
+          "myetherwallet.com.cm",
+          "myetherwallet.com.co",
+          "myetherwallet.com.de",
+          "myetherwallet.com.gl",
+          "myetherwallet.com.im",
+          "myetherwallet.com.ua",
+          "secure-myetherwallet.com",
+          "update-myetherwallet.com",
+          "wwwmyetherwallet.com",
+          "myeatherwallet.com",
+          "myetharwallet.com",
+          "myelherwallel.com",
+          "myetherwaillet.com",
+          "myetherwaliet.com",
+          "myetherwallel.com",
+          "myetherwallet.cam",
+          "myetherwallet.cc",
+          "myetherwallet.co",
+          "myetherwallet.cm",
+          "myetherwallet.cz",
+          "myetherwallet.org",
+          "myetherwallet.tech",
+          "myetherwallet.top",
+          "myetherwallet.net",
+          "etherclassicwallet.com",
+          "omg-omise.co",
+          "omise-go.com",
+          "tenx-tech.com",
+          "tokensale-tenx.tech",
+          "ubiqcoin.org",
+          "metamask.com",
+          "ethtrade.io",
+          "myetcwallet.com",
+          "account-kigo.net",
+          "bitcoin-wallet.net",
+          "blocklichan.info",
+          "bloclkicihan.info",
+          "coindash.ml",
+          "eos-bonus.com",
+          "eos-io.info",
+          "ether-wallet.net",
+          "ethereum-wallet.info",
+          "ethereum-wallet.net",
+          "ethereumchest.net",
+          "reservations-kigo.net",
+          "reservations-lodgix.com",
+          "secure-liverez.com",
+          "secure-onerooftop.com",
+          "settings-liverez.com",
+          "software-liverez.com",
+          "software-lodgix.com",
+          "unhackableetherwallets.com",
+          "www-myetherwallet.com",
+          "etherwallet.co.za",
+          "etherwalletchain.com",
+          "etherwallets.net",
+          "etherwallets.nl",
+          "my-ethwallet.com",
+          "my.ether-wallet.co",
+          "myetherwallet.com.am",
+          "myetherwallet.com.ht",
+          "myetherwalletcom.com",
+          "xn--myetherwalle-xoc.com",
+          "xn--myetherwalle-44i.com",
+          "xn--myetherwalle-xhk.com",
+          "xn--myetherwallt-cfb.com",
+          "xn--myetherwallt-6tb.com",
+          "xn--myetherwallt-xub.com",
+          "xn--myetherwallt-ovb.com",
+          "xn--myetherwallt-fwb.com",
+          "xn--myetherwallt-5wb.com",
+          "xn--myetherwallt-jzi.com",
+          "xn--myetherwallt-2ck.com",
+          "xn--myetherwallt-lok.com",
+          "xn--myetherwallt-lsl.com",
+          "xn--myetherwallt-ce6f.com",
+          "xn--myetherwalet-mcc.com",
+          "xn--myetherwalet-xhf.com",
+          "xn--myetherwalet-lcc.com",
+          "xn--myetherwaet-15ba.com",
+          "xn--myetherwalet-whf.com",
+          "xn--myetherwaet-v2ea.com",
+          "xn--myetherwllet-59a.com",
+          "xn--myetherwllet-jbb.com",
+          "xn--myetherwllet-wbb.com",
+          "xn--myetherwllet-9bb.com",
+          "xn--myetherwllet-ncb.com",
+          "xn--myetherwllet-0cb.com",
+          "xn--myetherwllet-5nb.com",
+          "xn--myetherwllet-ktd.com",
+          "xn--myetherwllet-mre.com",
+          "xn--myetherwllet-76e.com",
+          "xn--myetherwllet-o0l.com",
+          "xn--myetherwllet-c45f.com",
+          "xn--myetherallet-ejn.com",
+          "xn--myethewallet-4nf.com",
+          "xn--myethewallet-iof.com",
+          "xn--myethewallet-mpf.com",
+          "xn--myethewallet-6bk.com",
+          "xn--myethewallet-i31f.com",
+          "xn--myethrwallet-feb.com",
+          "xn--myethrwallt-fbbf.com",
+          "xn--myethrwallet-seb.com",
+          "xn--myethrwallt-rbbf.com",
+          "xn--myethrwallet-5eb.com",
+          "xn--myethrwallt-3bbf.com",
+          "xn--myethrwallet-0tb.com",
+          "xn--myethrwallt-tpbf.com",
+          "xn--myethrwallet-rub.com",
+          "xn--myethrwallt-iqbf.com",
+          "xn--myethrwallet-ivb.com",
+          "xn--myethrwallt-6qbf.com",
+          "xn--myethrwallet-8vb.com",
+          "xn--myethrwallt-vrbf.com",
+          "xn--myethrwallet-zwb.com",
+          "xn--myethrwallt-ksbf.com",
+          "xn--myethrwallet-dzi.com",
+          "xn--myethrwallt-wbif.com",
+          "xn--myethrwallet-wck.com",
+          "xn--myethrwallt-skjf.com",
+          "xn--myethrwallet-fok.com",
+          "xn--myethrwallt-fvjf.com",
+          "xn--myethrwallet-fsl.com",
+          "xn--myethrwallt-fwkf.com",
+          "xn--myethrwallet-5d6f.com",
+          "xn--myethrwallt-319ef.com",
+          "xn--myeterwallet-ufk.com",
+          "xn--myeterwallet-nrl.com",
+          "xn--myeterwallet-von.com",
+          "xn--myeterwallet-jl6c.com",
+          "xn--myeherwallet-ooc.com",
+          "xn--myeherwalle-6hci.com",
+          "xn--myeherwallet-v4i.com",
+          "xn--myeherwalle-zgii.com",
+          "xn--myeherwallet-ohk.com",
+          "xn--myeherwalle-6oji.com",
+          "xn--mytherwallet-ceb.com",
+          "xn--mythrwallet-cbbc.com",
+          "xn--mythrwallt-c7acf.com",
+          "xn--mytherwallet-peb.com",
+          "xn--mythrwallet-obbc.com",
+          "xn--mythrwallt-n7acf.com",
+          "xn--mytherwallet-2eb.com",
+          "xn--mythrwallet-0bbc.com",
+          "xn--mythrwallt-y7acf.com",
+          "xn--mytherwallet-xtb.com",
+          "xn--mythrwallet-qpbc.com",
+          "xn--mythrwallt-jlbcf.com",
+          "xn--mytherwallet-oub.com",
+          "xn--mythrwallet-fqbc.com",
+          "xn--mythrwallt-5lbcf.com",
+          "xn--mythrwallet-3qbc.com",
+          "xn--mythrwallt-smbcf.com",
+          "xn--mytherwallet-5vb.com",
+          "xn--mythrwallet-srbc.com",
+          "xn--mythrwallt-fnbcf.com",
+          "xn--mytherwallet-wwb.com",
+          "xn--mythrwallet-hsbc.com",
+          "xn--mythrwallt-1nbcf.com",
+          "xn--mytherwallet-9yi.com",
+          "xn--mythrwallet-tbic.com",
+          "xn--mythrwallt-dnhcf.com",
+          "xn--mytherwallet-tck.com",
+          "xn--mythrwallet-pkjc.com",
+          "xn--mythrwallt-lsicf.com",
+          "xn--mytherwallet-cok.com",
+          "xn--mythrwallet-cvjc.com",
+          "xn--mythrwallt-c2icf.com",
+          "xn--mytherwallet-csl.com",
+          "xn--mythrwallet-cwkc.com",
+          "xn--mythrwallt-c0jcf.com",
+          "xn--mytherwallet-2d6f.com",
+          "xn--mythrwallet-019ec.com",
+          "xn--mythrwallt-yq3ecf.com",
+          "xn--metherwallet-qlb.com",
+          "xn--metherwallet-1uf.com",
+          "xn--metherwallet-iyi.com",
+          "xn--metherwallet-zhk.com",
+          "xn--metherwallet-3ml.com",
+          "xn--mytherwallet-fvb.com",
+          "xn--myetherwallt-7db.com",
+          "xn--myetherwallt-leb.com",
+          "xn--myetherwallt-yeb.com",
+          "xn--yetherwallet-vjf.com",
+          "xn--yetherwallet-dfk.com",
+          "xn--yetherwallet-1t1f.com",
+          "xn--yetherwallet-634f.com"
+        ]
+      }
+    },
+    "AddressBookController": {
+      "addressBook": []
+    },
+    "TransactionController": {
+      "transactions": [
+        {
+          "id": 6616756286038869,
+          "time": 1502438908445,
+          "status": "confirmed",
+          "metamaskNetworkId": "3",
+          "txParams": {
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+                "blockNumber": "0x16b068",
+                "baseCount": 3,
+                "baseCountHex": "0x3",
+                "pendingCount": 3
+              }
+            },
+            {
+              "id": 6616756286038876,
+              "time": 1502734928623,
+              "status": "signed",
+              "metamaskNetworkId": "3",
+              "txParams": {
+                "from": "0x3ae39e89dc7e736cce53091057a45bf44b1a566c",
+                "to": "0x3ae39e89dc7e736cce53091057a45bf44b1a566c",
+                "value": "0x0",
+                "gasPrice": "0x4a817c800",
+                "gas": "0x7b0d",
+                "nonce": "0x06",
+                "chainId": 3
+              },
+              "gasLimitSpecified": false,
+              "estimatedGas": "5209",
+              "nonceDetails": {
+                "blockNumber": "0x16b068",
+                "baseCount": 3,
+                "baseCountHex": "0x3",
+                "pendingCount": 3
+              },
+              "rawTx": "0xf864068504a817c800827b0d943ae39e89dc7e736cce53091057a45bf44b1a566c80802aa0d983a744f58179522b4bb75f6320dbcf0a699506f2470139282a2ad02e92554fa030d818c35e997ba5d004df65a0c4ebcb49d098ec7dc190d7287a72f9c96f89e7"
+            },
+            {
+              "id": 6616756286038876,
+              "time": 1502734928623,
+              "status": "signed",
+              "metamaskNetworkId": "3",
+              "txParams": {
+                "from": "0x3ae39e89dc7e736cce53091057a45bf44b1a566c",
+                "to": "0x3ae39e89dc7e736cce53091057a45bf44b1a566c",
+                "value": "0x0",
+                "gasPrice": "0x4a817c800",
+                "gas": "0x7b0d",
+                "nonce": "0x06",
+                "chainId": 3
+              },
+              "gasLimitSpecified": false,
+              "estimatedGas": "5209",
+              "nonceDetails": {
+                "blockNumber": "0x16b068",
+                "baseCount": 3,
+                "baseCountHex": "0x3",
+                "pendingCount": 3
+              },
+              "rawTx": "0xf864068504a817c800827b0d943ae39e89dc7e736cce53091057a45bf44b1a566c80802aa0d983a744f58179522b4bb75f6320dbcf0a699506f2470139282a2ad02e92554fa030d818c35e997ba5d004df65a0c4ebcb49d098ec7dc190d7287a72f9c96f89e7"
+            },
+            {
+              "id": 6616756286038876,
+              "time": 1502734928623,
+              "status": "signed",
+              "metamaskNetworkId": "3",
+              "txParams": {
+                "from": "0x3ae39e89dc7e736cce53091057a45bf44b1a566c",
+                "to": "0x3ae39e89dc7e736cce53091057a45bf44b1a566c",
+                "value": "0x0",
+                "gasPrice": "0x4a817c800",
+                "gas": "0x7b0d",
+                "nonce": "0x06",
+                "chainId": 3
+              },
+              "gasLimitSpecified": false,
+              "estimatedGas": "5209",
+              "nonceDetails": {
+                "blockNumber": "0x16b068",
+                "baseCount": 3,
+                "baseCountHex": "0x3",
+                "pendingCount": 3
+              },
+              "rawTx": "0xf864068504a817c800827b0d943ae39e89dc7e736cce53091057a45bf44b1a566c80802aa0d983a744f58179522b4bb75f6320dbcf0a699506f2470139282a2ad02e92554fa030d818c35e997ba5d004df65a0c4ebcb49d098ec7dc190d7287a72f9c96f89e7",
+              "hash": "0x2c12c403aeb62a92bd5eabd3edcc38ab9e63bb0c93f706520bd2042894737ad1"
+            },
+            {
+              "id": 6616756286038876,
+              "time": 1502734928623,
+              "status": "signed",
+              "metamaskNetworkId": "3",
+              "txParams": {
+                "from": "0x3ae39e89dc7e736cce53091057a45bf44b1a566c",
+                "to": "0x3ae39e89dc7e736cce53091057a45bf44b1a566c",
+                "value": "0x0",
+                "gasPrice": "0x4a817c800",
+                "gas": "0x7b0d",
+                "nonce": "0x06",
+                "chainId": 3
+              },
+              "gasLimitSpecified": false,
+              "estimatedGas": "5209",
+              "nonceDetails": {
+                "blockNumber": "0x16b068",
+                "baseCount": 3,
+                "baseCountHex": "0x3",
+                "pendingCount": 3
+              },
+              "rawTx": "0xf864068504a817c800827b0d943ae39e89dc7e736cce53091057a45bf44b1a566c80802aa0d983a744f58179522b4bb75f6320dbcf0a699506f2470139282a2ad02e92554fa030d818c35e997ba5d004df65a0c4ebcb49d098ec7dc190d7287a72f9c96f89e7",
+              "hash": "0x2c12c403aeb62a92bd5eabd3edcc38ab9e63bb0c93f706520bd2042894737ad1"
+            },
+            {
+              "id": 6616756286038876,
+              "time": 1502734928623,
+              "status": "submitted",
+              "metamaskNetworkId": "3",
+              "txParams": {
+                "from": "0x3ae39e89dc7e736cce53091057a45bf44b1a566c",
+                "to": "0x3ae39e89dc7e736cce53091057a45bf44b1a566c",
+                "value": "0x0",
+                "gasPrice": "0x4a817c800",
+                "gas": "0x7b0d",
+                "nonce": "0x06",
+                "chainId": 3
+              },
+              "gasLimitSpecified": false,
+              "estimatedGas": "5209",
+              "nonceDetails": {
+                "blockNumber": "0x16b068",
+                "baseCount": 3,
+                "baseCountHex": "0x3",
+                "pendingCount": 3
+              },
+              "rawTx": "0xf864068504a817c800827b0d943ae39e89dc7e736cce53091057a45bf44b1a566c80802aa0d983a744f58179522b4bb75f6320dbcf0a699506f2470139282a2ad02e92554fa030d818c35e997ba5d004df65a0c4ebcb49d098ec7dc190d7287a72f9c96f89e7",
+              "hash": "0x2c12c403aeb62a92bd5eabd3edcc38ab9e63bb0c93f706520bd2042894737ad1"
+            },
+            {
+              "id": 6616756286038876,
+              "time": 1502734928623,
+              "status": "submitted",
+              "metamaskNetworkId": "3",
+              "txParams": {
+                "from": "0x3ae39e89dc7e736cce53091057a45bf44b1a566c",
+                "to": "0x3ae39e89dc7e736cce53091057a45bf44b1a566c",
+                "value": "0x0",
+                "gasPrice": "0x4a817c800",
+                "gas": "0x7b0d",
+                "nonce": "0x06",
+                "chainId": 3
+              },
+              "gasLimitSpecified": false,
+              "estimatedGas": "5209",
+              "nonceDetails": {
+                "blockNumber": "0x16b068",
+                "baseCount": 3,
+                "baseCountHex": "0x3",
+                "pendingCount": 3
+              },
+              "rawTx": "0xf864068504a817c800827b0d943ae39e89dc7e736cce53091057a45bf44b1a566c80802aa0d983a744f58179522b4bb75f6320dbcf0a699506f2470139282a2ad02e92554fa030d818c35e997ba5d004df65a0c4ebcb49d098ec7dc190d7287a72f9c96f89e7",
+              "hash": "0x2c12c403aeb62a92bd5eabd3edcc38ab9e63bb0c93f706520bd2042894737ad1"
+            },
+            {
+              "id": 6616756286038876,
+              "time": 1502734928623,
+              "status": "confirmed",
+              "metamaskNetworkId": "3",
+              "txParams": {
+                "from": "0x3ae39e89dc7e736cce53091057a45bf44b1a566c",
+                "to": "0x3ae39e89dc7e736cce53091057a45bf44b1a566c",
+                "value": "0x0",
+                "gasPrice": "0x4a817c800",
+                "gas": "0x7b0d",
+                "nonce": "0x06",
+                "chainId": 3
+              },
+              "gasLimitSpecified": false,
+              "estimatedGas": "5209",
+              "nonceDetails": {
+                "blockNumber": "0x16b068",
+                "baseCount": 3,
+                "baseCountHex": "0x3",
+                "pendingCount": 3
+              },
+              "rawTx": "0xf864068504a817c800827b0d943ae39e89dc7e736cce53091057a45bf44b1a566c80802aa0d983a744f58179522b4bb75f6320dbcf0a699506f2470139282a2ad02e92554fa030d818c35e997ba5d004df65a0c4ebcb49d098ec7dc190d7287a72f9c96f89e7",
+              "hash": "0x2c12c403aeb62a92bd5eabd3edcc38ab9e63bb0c93f706520bd2042894737ad1",
+              "retryCount": 5
+            },
+            {
+              "id": 6616756286038876,
+              "time": 1502734928623,
+              "status": "confirmed",
+              "metamaskNetworkId": "3",
+              "txParams": {
+                "from": "0x3ae39e89dc7e736cce53091057a45bf44b1a566c",
+                "to": "0x3ae39e89dc7e736cce53091057a45bf44b1a566c",
+                "value": "0x0",
+                "gasPrice": "0x4a817c800",
+                "gas": "0x7b0d",
+                "nonce": "0x06",
+                "chainId": 3
+              },
+              "gasLimitSpecified": false,
+              "estimatedGas": "5209",
+              "nonceDetails": {
+                "blockNumber": "0x16b068",
+                "baseCount": 3,
+                "baseCountHex": "0x3",
+                "pendingCount": 3
+              },
+              "rawTx": "0xf864068504a817c800827b0d943ae39e89dc7e736cce53091057a45bf44b1a566c80802aa0d983a744f58179522b4bb75f6320dbcf0a699506f2470139282a2ad02e92554fa030d818c35e997ba5d004df65a0c4ebcb49d098ec7dc190d7287a72f9c96f89e7",
+              "hash": "0x2c12c403aeb62a92bd5eabd3edcc38ab9e63bb0c93f706520bd2042894737ad1",
+              "retryCount": 5
+            }
+          ],
+          "gasLimitSpecified": false,
+          "estimatedGas": "5209",
+          "nonceDetails": {
+            "blockNumber": "0x16b068",
+            "baseCount": 3,
+            "baseCountHex": "0x3",
+            "pendingCount": 3
+          },
+          "rawTx": "0xf864068504a817c800827b0d943ae39e89dc7e736cce53091057a45bf44b1a566c80802aa0d983a744f58179522b4bb75f6320dbcf0a699506f2470139282a2ad02e92554fa030d818c35e997ba5d004df65a0c4ebcb49d098ec7dc190d7287a72f9c96f89e7",
+          "hash": "0x2c12c403aeb62a92bd5eabd3edcc38ab9e63bb0c93f706520bd2042894737ad1",
+          "retryCount": 5
+        }
+      ]
+    }
+  }
+}
\ No newline at end of file
diff --git a/test/unit/tx-controller-test.js b/test/unit/tx-controller-test.js
index 57d7deccd..7bb193242 100644
--- a/test/unit/tx-controller-test.js
+++ b/test/unit/tx-controller-test.js
@@ -6,12 +6,15 @@ const clone = require('clone')
 const sinon = require('sinon')
 const TransactionController = require('../../app/scripts/controllers/transactions')
 const TxProvideUtils = require('../../app/scripts/lib/tx-utils')
+const txStateHistoryHelper = require('../../app/scripts/lib/tx-state-history-helper')
+
 const noop = () => true
 const currentNetworkId = 42
 const otherNetworkId = 36
 const privKey = new Buffer('8718b9618a37d1fc78c436511fc6df3c8258d3250635bba617f33003270ec03e', 'hex')
 const { createStubedProvider } = require('../stub/provider')
 
+
 describe('Transaction Controller', function () {
   let txController, engine, provider, providerResultStub
 
@@ -47,7 +50,7 @@ describe('Transaction Controller', function () {
         metamaskNetworkId: currentNetworkId,
         txParams,
       }
-      txController._saveTxList([txMeta])
+      txController.addTx(txMeta)
       stub = sinon.stub(txController, 'addUnapprovedTransaction').returns(Promise.resolve(txMeta))
     })
 
@@ -279,12 +282,15 @@ describe('Transaction Controller', function () {
     it('replaces the tx with the same id', function () {
       txController.addTx({ id: '1', status: 'unapproved', metamaskNetworkId: currentNetworkId, txParams: {} }, noop)
       txController.addTx({ id: '2', status: 'confirmed', metamaskNetworkId: currentNetworkId, txParams: {} }, noop)
-      txController.updateTx({ id: '1', status: 'blah', hash: 'foo', metamaskNetworkId: currentNetworkId, txParams: {} })
-      var result = txController.getTx('1')
-      assert.equal(result.hash, 'foo')
+      const tx1 = txController.getTx('1')
+      tx1.status = 'blah'
+      tx1.hash = 'foo'
+      txController.updateTx(tx1)
+      const savedResult = txController.getTx('1')
+      assert.equal(savedResult.hash, 'foo')
     })
 
-    it('updates gas price', function () {
+    it('updates gas price and adds history items', function () {
       const originalGasPrice = '0x01'
       const desiredGasPrice = '0x02'
 
@@ -297,13 +303,22 @@ describe('Transaction Controller', function () {
         },
       }
 
-      const updatedMeta = clone(txMeta)
-
       txController.addTx(txMeta)
-      updatedMeta.txParams.gasPrice = desiredGasPrice
-      txController.updateTx(updatedMeta)
-      var result = txController.getTx('1')
+      const updatedTx = txController.getTx('1')
+      // verify tx was initialized correctly
+      assert.equal(updatedTx.history.length, 1, 'one history item (initial)')
+      assert.equal(Array.isArray(updatedTx.history[0]), false, 'first history item is initial state')
+      assert.deepEqual(updatedTx.history[0], txStateHistoryHelper.snapshotFromTxMeta(updatedTx), 'first history item is initial state')
+      // modify value and updateTx
+      updatedTx.txParams.gasPrice = desiredGasPrice
+      txController.updateTx(updatedTx)
+      // check updated value
+      const result = txController.getTx('1')
       assert.equal(result.txParams.gasPrice, desiredGasPrice, 'gas price updated')
+      // validate history was updated
+      assert.equal(result.history.length, 2, 'two history items (initial + diff)')
+      const expectedEntry = { op: 'replace', path: '/txParams/gasPrice', value: desiredGasPrice }
+      assert.deepEqual(result.history[1], [expectedEntry], 'two history items (initial + diff)')
     })
   })
 
diff --git a/test/unit/tx-state-history-helper.js b/test/unit/tx-state-history-helper.js
new file mode 100644
index 000000000..5bb6c9bee
--- /dev/null
+++ b/test/unit/tx-state-history-helper.js
@@ -0,0 +1,23 @@
+const assert = require('assert')
+const txStateHistoryHelper = require('../../app/scripts/lib/tx-state-history-helper')
+const testVault = require('../data/v17-long-history.json')
+
+
+describe('tx-state-history-helper', function () {
+  it('migrates history to diffs and can recover original values', function () {
+    testVault.data.TransactionController.transactions.forEach((tx, index) => {
+      const newHistory = txStateHistoryHelper.migrateFromSnapshotsToDiffs(tx.history)
+      newHistory.forEach((newEntry, index) => {
+        if (index === 0) {
+          assert.equal(Array.isArray(newEntry), false, 'initial history item IS NOT a json patch obj')
+        } else {
+          assert.equal(Array.isArray(newEntry), true, 'non-initial history entry IS a json patch obj')
+        }
+        const oldEntry = tx.history[index]
+        const historySubset = newHistory.slice(0, index + 1)
+        const reconstructedValue = txStateHistoryHelper.replayHistory(historySubset)
+        assert.deepEqual(oldEntry, reconstructedValue, 'was able to reconstruct old entry from diffs')
+      })
+    })
+  })
+})