Merge the develop branch to the master branch, preparation to v3.1.0

This merge contains the following set of changes: * [Oracle, Improvement] Try to detect unsynced node state (#592) * [Oracle, Improvement] Allow to override JSON RPC error codes (#603) * [Oracle, Fix] Fix handling of Compound related Transfer events (#595) * [Oracle, Fix] Add new nonce-related error messages (#599) * [Deployment, Fix] .env template includes latest changes related to the oracle configuration (#601) * [Deployment, Fix] Improvements for the local logs configuration (#602) * [Common, Other] Update the contract's submodule to the release 6.0.0 (#600)
2021-09-20 23:56:37 +03:00 · 2021-09-20 23:56:37 +03:00 · 78564afabd
commit 78564afabd
parent 4f5e3c47be 70a2c30b4c
27 changed files with 1006 additions and 1583 deletions
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@ -77,7 +77,7 @@ jobs:
      - name: Rebuild and push updated images
        run: |
          function check_if_image_exists() {
-            curl -fsSlL -H 'Authorization: bearer ${{ github.token }}' "https://${DOCKER_REGISTRY}/v2/${DOCKER_REPO}/tokenbridge-e2e-$1/manifests/$2" > /dev/null
+            curl -fsSlL "https://${{ github.actor }}:${{ github.token }}@${DOCKER_REGISTRY}/v2/${DOCKER_REPO}/tokenbridge-e2e-$1/manifests/$2" > /dev/null
          }
          updated=()
          if ! check_if_image_exists e2e ${E2E_TAG};         then updated+=("e2e"); fi
@ -104,7 +104,7 @@ jobs:
      - name: Rebuild and push molecule runner e2e image
        run: |
          function check_if_image_exists() {
-            curl -fsSlL -H 'Authorization: bearer ${{ github.token }}' "https://${DOCKER_REGISTRY}/v2/${DOCKER_REPO}/tokenbridge-e2e-$1/manifests/$2" > /dev/null
+            curl -fsSlL "https://${{ github.actor }}:${{ github.token }}@${DOCKER_REGISTRY}/v2/${DOCKER_REPO}/tokenbridge-e2e-$1/manifests/$2" > /dev/null
          }
          if check_if_image_exists molecule_runner ${MOLECULE_RUNNER_TAG}; then
            echo "Image already exists"
--- a/CONFIGURATION.md
+++ b/CONFIGURATION.md
@ -52,6 +52,7 @@ ORACLE_SHUTDOWN_CONTRACT_ADDRESS | Optional contract address in the side chain a
 ORACLE_SHUTDOWN_CONTRACT_METHOD | Method signature to be used in the side chain to identify the current shutdown status. Method should return boolean. Default value is `isShutdown()`. | `function signature`
 ORACLE_FOREIGN_RPC_BLOCK_POLLING_LIMIT | Max length for the block range used in `eth_getLogs` requests for polling contract events for the Foreign chain. Infinite, if not provided. | `integer`
 ORACLE_HOME_RPC_BLOCK_POLLING_LIMIT | Max length for the block range used in `eth_getLogs` requests for polling contract events for the Home chain. Infinite, if not provided. | `integer`
+ORACLE_JSONRPC_ERROR_CODES | Override default JSON rpc error codes that can trigger RPC fallback to the next URL from the list (or a retry in case of a single RPC URL). Default is `-32603,-32002,-32005`. Should be a comma-separated list of negative integers. | `string`


 ## Monitor configuration
--- a/commons/abis.js
+++ b/commons/abis.js
@ -1,5 +1,5 @@
 const HOME_ERC_TO_NATIVE_ABI = require('../contracts/build/contracts/HomeBridgeErcToNative').abi
-const FOREIGN_ERC_TO_NATIVE_ABI = require('../contracts/build/contracts/ForeignBridgeErcToNative').abi
+const FOREIGN_ERC_TO_NATIVE_ABI = require('../contracts/build/contracts/XDaiForeignBridge.json').abi
 const ERC20_ABI = require('../contracts/build/contracts/ERC20').abi
 const BLOCK_REWARD_ABI = require('../contracts/build/contracts/BlockRewardMock').abi
 const BRIDGE_VALIDATORS_ABI = require('../contracts/build/contracts/BridgeValidators').abi
--- a/2
+++ b/2
@ -1 +1 @@
-Subproject commit 004d466a3d593e6304e52c74e6c3e801b6a33b32
+Subproject commit 908a48107919d4ab127f9af07d44d47eac91547e
--- a/deployment/roles/common/templates/docker-logs.j2
+++ b/deployment/roles/common/templates/docker-logs.j2
@ -1,6 +1,6 @@
 /var/log/docker/*/docker.log {
  rotate 5
-  size 1G
+  size 100M
  compress
  missingok
  delaycompress
@ -8,7 +8,7 @@
 }
 /var/log/docker/*.log {
  rotate 5
-  size 1G
+  size 100M
  compress
  missingok
  delaycompress
--- a/deployment/roles/oracle/tasks/logging.yml
+++ b/deployment/roles/oracle/tasks/logging.yml
@ -7,7 +7,7 @@
  loop_control:
    loop_var: file

- name: Set the local container logs configuration file
+- name: Set the oracle's containers local logs configuration file
  template:
    src: 31-oracle-docker.conf.j2
    dest: /etc/rsyslog.d/31-oracle-docker.conf
@ -15,6 +15,22 @@
    group: root
    mode: 0644

+- name: Set the redis container local logs configuration file
+  template:
+    src: 32-redis-docker.conf.j2
+    dest: /etc/rsyslog.d/32-redis-docker.conf
+    owner: root
+    group: root
+    mode: 0644
+
+- name: Set the rabbit MQ container local logs configuration file
+  template:
+    src: 33-rabbit-docker.conf.j2
+    dest: /etc/rsyslog.d/33-rabbit-docker.conf
+    owner: root
+    group: root
+    mode: 0644
+
 - name: Set the log configuration file to send container logs to remote server
  template:
    src: 36-oracle-remote-logging.conf.j2
--- a/deployment/roles/oracle/templates/.env.j2
+++ b/deployment/roles/oracle/templates/.env.j2
@ -11,9 +11,16 @@ ORACLE_HOME_RPC_POLLING_INTERVAL={{ ORACLE_HOME_RPC_POLLING_INTERVAL }}

 ## Foreign contract
 COMMON_FOREIGN_RPC_URL={{ COMMON_FOREIGN_RPC_URL }}
+{% if ORACLE_FOREIGN_ARCHIVE_RPC_URL | default('') != '' %}
+ORACLE_FOREIGN_ARCHIVE_RPC_URL={{ ORACLE_FOREIGN_ARCHIVE_RPC_URL }}
+{% endif %}
 COMMON_FOREIGN_BRIDGE_ADDRESS={{ COMMON_FOREIGN_BRIDGE_ADDRESS }}
 ORACLE_FOREIGN_RPC_POLLING_INTERVAL={{ ORACLE_FOREIGN_RPC_POLLING_INTERVAL }}

+{% if ORACLE_TX_REDUNDANCY | default('') != '' %}
+ORACLE_TX_REDUNDANCY={{ ORACLE_TX_REDUNDANCY }}
+{% endif %}
+
 ## Gasprice
 {% if COMMON_HOME_GAS_PRICE_SUPPLIER_URL | default('') != '' %}
 COMMON_HOME_GAS_PRICE_SUPPLIER_URL={{ COMMON_HOME_GAS_PRICE_SUPPLIER_URL }}
@ -47,8 +54,28 @@ COMMON_FOREIGN_GAS_PRICE_FACTOR={{ COMMON_FOREIGN_GAS_PRICE_FACTOR }}
 ORACLE_ALLOW_HTTP_FOR_RPC={{ "yes" if ORACLE_ALLOW_HTTP_FOR_RPC else "no" }}
 ORACLE_QUEUE_URL={{ ORACLE_QUEUE_URL }}
 ORACLE_REDIS_URL={{ ORACLE_REDIS_URL }}
-{% if ORACLE_TX_REDUNDANCY | default('') != '' %}
-ORACLE_TX_REDUNDANCY={{ ORACLE_TX_REDUNDANCY }}
+{% if ORACLE_FOREIGN_TX_RESEND_INTERVAL | default('') != '' %}
+ORACLE_FOREIGN_TX_RESEND_INTERVAL={{ ORACLE_FOREIGN_TX_RESEND_INTERVAL }}
+{% endif %}
+{% if ORACLE_HOME_TX_RESEND_INTERVAL | default('') != '' %}
+ORACLE_HOME_TX_RESEND_INTERVAL={{ ORACLE_HOME_TX_RESEND_INTERVAL }}
+{% endif %}
+
+## Emergency shutdown configuration
+{% if ORACLE_SHUTDOWN_SERVICE_URL | default('') != '' %}
+ORACLE_SHUTDOWN_SERVICE_URL={{ ORACLE_SHUTDOWN_SERVICE_URL }}
+{% endif %}
+{% if ORACLE_SHUTDOWN_SERVICE_POLLING_INTERVAL | default('') != '' %}
+ORACLE_SHUTDOWN_SERVICE_POLLING_INTERVAL={{ ORACLE_SHUTDOWN_SERVICE_POLLING_INTERVAL }}
+{% endif %}
+{% if ORACLE_SIDE_RPC_URL | default('') != '' %}
+ORACLE_SIDE_RPC_URL={{ ORACLE_SIDE_RPC_URL }}
+{% endif %}
+{% if ORACLE_SHUTDOWN_CONTRACT_ADDRESS | default('') != '' %}
+ORACLE_SHUTDOWN_CONTRACT_ADDRESS={{ ORACLE_SHUTDOWN_CONTRACT_ADDRESS }}
+{% endif %}
+{% if ORACLE_SHUTDOWN_CONTRACT_METHOD | default('') != '' %}
+ORACLE_SHUTDOWN_CONTRACT_METHOD={{ ORACLE_SHUTDOWN_CONTRACT_METHOD }}
 {% endif %}

 {% if ORACLE_HOME_START_BLOCK | default('') != '' %}
--- a/deployment/roles/oracle/templates/32-redis-docker.conf.j2
+++ b/deployment/roles/oracle/templates/32-redis-docker.conf.j2
@ -0,0 +1,11 @@
+$FileCreateMode 0644
+template(name="DockerLogFileName_Redis" type="list") {
+   constant(value="/var/log/docker/")
+   property(name="syslogtag" securepath="replace" regex.type="ERE" regex.submatch="1" regex.expression="oracle_(.*redis.*)\\/[a-zA-Z0-9]+\\[")
+   constant(value="/docker.log")
+}
+
+if $programname contains 'oracle' and $programname contains 'redis' then \
+  ?DockerLogFileName_Redis
+
+$FileCreateMode 0600
--- a/deployment/roles/oracle/templates/33-rabbit-docker.conf.j2
+++ b/deployment/roles/oracle/templates/33-rabbit-docker.conf.j2
@ -0,0 +1,11 @@
+$FileCreateMode 0644
+template(name="DockerLogFileName_Rabbit" type="list") {
+   constant(value="/var/log/docker/")
+   property(name="syslogtag" securepath="replace" regex.type="ERE" regex.submatch="1" regex.expression="oracle_(.*rabbit.*)\\/[a-zA-Z0-9]+\\[")
+   constant(value="/docker.log")
+}
+
+if $programname contains 'oracle' and $programname contains 'rabbit' then \
+  ?DockerLogFileName_Rabbit
+
+$FileCreateMode 0600
--- a/e2e-commons/constants.json
+++ b/e2e-commons/constants.json
@ -38,7 +38,7 @@
  "ercToNativeBridge": {
    "home": "0x5118AC62AE912Dd5B51EEfF7338c4fcb0248Ba8c",
    "foreign": "0x32198D570fffC7033641F8A9094FFDCaAEF42624",
-    "foreignToken": "0x7cc4b1851c35959d34e635a470f6b5c43ba3c9c9",
+    "foreignToken": "0x6B175474E89094C44Da98b954EedeAC495271d0F",
    "monitor": "http://monitor-erc20-native:3012/bridge"
  },
  "amb": {
--- a/e2e-commons/contracts-envs/erc-to-native.env
+++ b/e2e-commons/contracts-envs/erc-to-native.env
@ -32,7 +32,7 @@ FOREIGN_GAS_PRICE=10000000000
 FOREIGN_REWARDABLE=false

 BLOCK_REWARD_ADDRESS=0xdbeE25CbE97e4A5CC6c499875774dc7067E9426B
-ERC20_TOKEN_ADDRESS=0x7cc4b1851c35959d34e635a470f6b5c43ba3c9c9
+ERC20_TOKEN_ADDRESS=0x6B175474E89094C44Da98b954EedeAC495271d0F

 REQUIRED_NUMBER_OF_VALIDATORS=1
 VALIDATORS="0xaaB52d66283F7A1D5978bcFcB55721ACB467384b 0xdCC784657C78054aa61FbcFFd2605F32374816A4 0xDcef88209a20D52165230104B245803C3269454d"
--- a/monitor/getBalances.js
+++ b/monitor/getBalances.js
@ -46,24 +46,6 @@ async function main(bridgeMode, eventsInfo) {
    const foreignBridge = new web3Foreign.eth.Contract(FOREIGN_ERC_TO_NATIVE_ABI, COMMON_FOREIGN_BRIDGE_ADDRESS)
    const erc20Address = await foreignBridge.methods.erc20token().call()
    const erc20Contract = new web3Foreign.eth.Contract(ERC20_ABI, erc20Address)
-    let investedAmountInDai = 0
-    let bridgeDsrBalance = 0
-    let displayChaiToken = false
-
-    try {
-      logger.debug('calling foreignBridge.methods.isChaiTokenEnabled')
-      if (await foreignBridge.methods.isChaiTokenEnabled().call()) {
-        displayChaiToken = true
-        logger.debug('calling foreignBridge.methods.investedAmountInDai')
-        investedAmountInDai = await foreignBridge.methods.investedAmountInDai().call()
-        logger.debug('calling foreignBridge.methods.dsrBalance')
-        bridgeDsrBalance = await foreignBridge.methods.dsrBalance().call()
-      } else {
-        logger.debug('Chai token is currently disabled')
-      }
-    } catch (e) {
-      logger.debug('Methods for chai token are not present')
-    }

    logger.debug('calling erc20Contract.methods.balanceOf')
    const foreignErc20Balance = await erc20Contract.methods
@ -85,29 +67,16 @@ async function main(bridgeMode, eventsInfo) {
    const burntCoinsBN = new BN(burntCoins)
    const totalSupplyBN = mintedCoinsBN.minus(burntCoinsBN)
    const foreignErc20BalanceBN = new BN(foreignErc20Balance).plus(lateForeignConfirmationsTotalValue)
-    const investedAmountInDaiBN = new BN(investedAmountInDai)
-    const bridgeDsrBalanceBN = new BN(bridgeDsrBalance)
-
-    const diff = foreignErc20BalanceBN
-      .plus(investedAmountInDaiBN)
-      .minus(totalSupplyBN)
-      .toFixed()
-
-    const foreign = {
-      erc20Balance: Web3Utils.fromWei(foreignErc20Balance)
-    }
-
-    if (displayChaiToken) {
-      foreign.investedErc20Balance = Web3Utils.fromWei(investedAmountInDai)
-      foreign.accumulatedInterest = Web3Utils.fromWei(bridgeDsrBalanceBN.minus(investedAmountInDaiBN).toString(10))
-    }

+    const diff = foreignErc20BalanceBN.minus(totalSupplyBN).toFixed()
    logger.debug('Done')
    return {
      home: {
        totalSupply: Web3Utils.fromWei(totalSupplyBN.toFixed())
      },
-      foreign,
+      foreign: {
+        erc20Balance: Web3Utils.fromWei(foreignErc20Balance)
+      },
      balanceDiff: Number(Web3Utils.fromWei(diff)),
      ...blockRanges,
      lastChecked: Math.floor(Date.now() / 1000)
--- a/monitor/utils/events.js
+++ b/monitor/utils/events.js
@ -11,7 +11,6 @@ const {
  OLD_AMB_USER_REQUEST_FOR_AFFIRMATION_ABI
 } = require('../../commons')
 const { normalizeEventInformation } = require('./message')
-const { filterTransferBeforeES } = require('./tokenUtils')
 const { writeFile, readCacheFile } = require('./file')
 const { web3Home, web3Foreign, getHomeBlockNumber, getForeignBlockNumber } = require('./web3')
 const { getPastEvents } = require('./web3Cache')
@ -160,80 +159,32 @@ async function main(mode) {
        filter: { to: COMMON_FOREIGN_BRIDGE_ADDRESS }
      },
      chain: 'foreign'
-    })).map(normalizeEvent)
+    }))
+      .map(normalizeEvent)
+      .filter(e => e.recipient !== ZERO_ADDRESS) // filter mint operation during SCD-to-MCD swaps
+      .filter(e => e.recipient.toLowerCase() !== '0x5d3a536e4d6dbd6114cc1ead35777bab948e3643') // filter cDai withdraws during compounding

-    let directTransfers = transferEvents
-    const tokensSwappedAbiExists = FOREIGN_ABI.filter(e => e.type === 'event' && e.name === 'TokensSwapped')[0]
-    if (tokensSwappedAbiExists) {
-      logger.debug('collecting half duplex tokens participated in the bridge balance')
-      logger.debug("calling foreignBridge.getPastEvents('TokensSwapped')")
-      const tokensSwappedEvents = await getPastEvents(foreignBridge, {
-        event: 'TokensSwapped',
-        fromBlock: MONITOR_FOREIGN_START_BLOCK,
-        toBlock: foreignBlockNumber,
-        chain: 'foreign',
-        safeToBlock: foreignDelayedBlockNumber
-      })
-
-      // Get token swap events emitted by foreign bridge
-      const bridgeTokensSwappedEvents = tokensSwappedEvents.filter(e => e.address === COMMON_FOREIGN_BRIDGE_ADDRESS)
-
-      // Get transfer events for each previous erc20
-      const uniqueTokenAddressesSet = new Set(bridgeTokensSwappedEvents.map(e => e.returnValues.from))
-
-      // Exclude chai token from previous erc20
-      try {
-        logger.debug('calling foreignBridge.chaiToken() to remove it from half duplex tokens list')
-        const chaiToken = await foreignBridge.methods.chaiToken().call()
-        uniqueTokenAddressesSet.delete(chaiToken)
-      } catch (e) {
-        logger.debug('call to foreignBridge.chaiToken() failed')
-      }
-      // Exclude dai token from previous erc20
-      try {
-        logger.debug('calling foreignBridge.erc20token()  to remove it from half duplex tokens list')
-        const daiToken = await foreignBridge.methods.erc20token().call()
-        uniqueTokenAddressesSet.delete(daiToken)
-      } catch (e) {
-        logger.debug('call to foreignBridge.erc20token() failed')
-      }
-
-      const uniqueTokenAddresses = [...uniqueTokenAddressesSet]
-      await Promise.all(
-        uniqueTokenAddresses.map(async tokenAddress => {
-          const halfDuplexTokenContract = new web3Foreign.eth.Contract(ERC20_ABI, tokenAddress)
-
-          logger.debug('Half duplex token:', tokenAddress)
+    // Get transfer events for each previously used Sai token
+    const saiTokenAddress = '0x89d24A6b4CcB1B6fAA2625fE562bDD9a23260359'
+    const halfDuplexTokenContract = new web3Foreign.eth.Contract(ERC20_ABI, saiTokenAddress)
+    logger.debug('Half duplex token:', saiTokenAddress)
    logger.debug("calling halfDuplexTokenContract.getPastEvents('Transfer')")
+    // https://etherscan.io/tx/0xd0c3c92c94e05bc71256055ce8c4c993e047f04e04f3283a04e4cb077b71f6c6
+    const blockNumberHalfDuplexDisabled = 9884448
    const halfDuplexTransferEvents = (await getPastEvents(halfDuplexTokenContract, {
      event: 'Transfer',
      fromBlock: MONITOR_FOREIGN_START_BLOCK,
-            toBlock: foreignDelayedBlockNumber,
+      toBlock: Math.min(blockNumberHalfDuplexDisabled, foreignDelayedBlockNumber),
      options: {
        filter: { to: COMMON_FOREIGN_BRIDGE_ADDRESS }
      },
      chain: 'foreign'
    })).map(normalizeEvent)

-          // Remove events after the ES
-          logger.debug('filtering half duplex transfers happened before ES')
-          const validHalfDuplexTransfers = await filterTransferBeforeES(halfDuplexTransferEvents)
-
-          transferEvents = [...validHalfDuplexTransfers, ...transferEvents]
-        })
-      )
-
-      // filter transfer that is part of a token swap
-      directTransfers = transferEvents.filter(
-        e =>
-          bridgeTokensSwappedEvents.findIndex(
-            t => t.transactionHash === e.referenceTx && e.recipient === ZERO_ADDRESS
-          ) === -1
-      )
-    }
+    transferEvents = [...halfDuplexTransferEvents, ...transferEvents]

    // Get transfer events that didn't have a UserRequestForAffirmation event in the same transaction
-    directTransfers = directTransfers.filter(
+    const directTransfers = transferEvents.filter(
      e => foreignToHomeRequests.findIndex(t => t.referenceTx === e.referenceTx) === -1
    )

--- a/monitor/utils/tokenUtils.js
+++ b/monitor/utils/tokenUtils.js
@ -1,27 +0,0 @@
-// https://etherscan.io/tx/0xd0c3c92c94e05bc71256055ce8c4c993e047f04e04f3283a04e4cb077b71f6c6
-const blockNumberHalfDuplexDisabled = 9884448
-
-/**
- * Returns true if the event was before the bridge stopped supporting half duplex transfers.
- */
-async function transferBeforeES(event) {
-  return event.blockNumber < blockNumberHalfDuplexDisabled
-}
-
-async function filterTransferBeforeES(array) {
-  const newArray = []
-  // Iterate events from newer to older
-  for (let i = array.length - 1; i >= 0; i--) {
-    const beforeES = await transferBeforeES(array[i])
-    if (beforeES) {
-      // add element to first position so the new array will have the same order
-      newArray.unshift(array[i])
-    }
-  }
-  return newArray
-}
-
-module.exports = {
-  filterTransferBeforeES,
-  blockNumberHalfDuplexDisabled
-}
--- a/oracle-e2e/test/ercToNative.js
+++ b/oracle-e2e/test/ercToNative.js
@ -33,6 +33,10 @@ const homeBridge = new homeWeb3.eth.Contract(HOME_ERC_TO_NATIVE_ABI, COMMON_HOME

 describe('erc to native', () => {
  before(async () => {
+    console.log('Initializing interest')
+    await foreignBridge.methods
+      .initializeInterest(ercToNativeBridge.foreignToken, 1, 1, validator.address)
+      .send({ from: validator.address, gas: '4000000' })
    if (process.env.ULTIMATE === 'true') {
      return
    }
@ -112,6 +116,7 @@ describe('erc to native', () => {
      .catch(e => {
        console.error(e)
      })
+    await foreignBridge.methods.investDai().send({ from: validator.address, gas: '4000000' })

    // check that balance increases
    await uniformRetry(async retry => {
--- a/oracle/src/confirmRelay.js
+++ b/oracle/src/confirmRelay.js
@ -6,6 +6,7 @@ const logger = require('./services/logger')
 const GasPrice = require('./services/gasPrice')
 const { getNonce, getChainId, getEventsFromTx } = require('./tx/web3')
 const { sendTx } = require('./tx/sendTx')
+const { getTokensState } = require('./utils/tokenState')
 const { checkHTTPS, watchdog, syncForEach, addExtraGas } = require('./utils/utils')
 const { EXIT_CODES, EXTRA_GAS_PERCENTAGE, MAX_GAS_LIMIT } = require('./utils/constants')

@ -17,7 +18,7 @@ if (process.argv.length < 4) {
 }

 const config = require(path.join('../config/', process.argv[2]))
-const { web3, eventContract, chain } = config.main
+const { web3, eventContract, chain, bridgeContract } = config.main

 const isTxHash = txHash => txHash.length === 66 && web3.utils.isHexStrict(txHash)
 function readTxHashes(filePath) {
@ -49,7 +50,7 @@ async function initialize() {
  try {
    const checkHttps = checkHTTPS(ORACLE_ALLOW_HTTP_FOR_RPC, logger)

-    web3.currentProvider.subProvider.urls.forEach(checkHttps(chain))
+    web3.currentProvider.urls.forEach(checkHttps(chain))

    attached = await isAttached()
    if (attached) {
@ -114,6 +115,12 @@ function processEvents(events) {
 }

 async function main({ sendJob, txHashes }) {
+  if (config.id === 'erc-native-transfer') {
+    logger.debug('Getting token address to listen Transfer events')
+    const state = await getTokensState(bridgeContract, logger)
+    eventContract.options.address = state.bridgeableTokenAddress
+  }
+
  logger.info(`Processing ${txHashes.length} input transactions`)
  for (const txHash of txHashes) {
    try {
--- a/oracle/src/events/processTransfers/index.js
+++ b/oracle/src/events/processTransfers/index.js
@ -13,12 +13,25 @@ const limit = promiseLimit(MAX_CONCURRENT_EVENTS)
 function processTransfersBuilder(config) {
  const { bridgeContract, web3 } = config.home

-  const userRequestForAffirmationAbi = config.foreign.bridgeABI.find(
-    e => e.type === 'event' && e.name === 'UserRequestForAffirmation'
-  )
-  const tokensSwappedAbi = config.foreign.bridgeABI.find(e => e.type === 'event' && e.name === 'TokensSwapped')
-  const userRequestForAffirmationHash = web3.eth.abi.encodeEventSignature(userRequestForAffirmationAbi)
-  const tokensSwappedHash = tokensSwappedAbi ? web3.eth.abi.encodeEventSignature(tokensSwappedAbi) : '0x'
+  const userRequestForAffirmationHash = web3.eth.abi.encodeEventSignature('UserRequestForAffirmation(address,uint256)')
+  const redeemHash = web3.eth.abi.encodeEventSignature('Redeem(address,uint256,uint256)')
+  const transferHash = web3.eth.abi.encodeEventSignature('Transfer(address,address,uint256)')
+
+  const foreignBridgeAddress = config.foreign.bridgeAddress
+
+  const decodeAddress = data => web3.eth.abi.decodeParameter('address', data)
+
+  const isUserRequestForAffirmation = e =>
+    e.address.toLowerCase() === foreignBridgeAddress.toLowerCase() && e.topics[0] === userRequestForAffirmationHash
+  const isRedeem = cTokenAddress => e =>
+    e.address.toLowerCase() === cTokenAddress.toLowerCase() &&
+    e.topics[0] === redeemHash &&
+    decodeAddress(e.data.slice(0, 66)).toLowerCase() === foreignBridgeAddress.toLowerCase()
+  const isCTokenTransfer = cTokenAddress => e =>
+    e.address.toLowerCase() === cTokenAddress.toLowerCase() &&
+    e.topics[0] === transferHash &&
+    decodeAddress(e.topics[1]).toLowerCase() === foreignBridgeAddress.toLowerCase() &&
+    decodeAddress(e.topics[2]).toLowerCase() === cTokenAddress.toLowerCase()

  let validatorContract = null

@ -32,37 +45,35 @@ function processTransfersBuilder(config) {
    rootLogger.debug(`Processing ${transfers.length} Transfer events`)
    const callbacks = transfers
      .map(transfer => async () => {
-        const { from, value } = transfer.returnValues
+        const { from, to, value } = transfer.returnValues

        const logger = rootLogger.child({
-          eventTransactionHash: transfer.transactionHash
+          eventTransactionHash: transfer.transactionHash,
+          from,
+          to,
+          value
        })

-        logger.info({ from, value }, `Processing transfer ${transfer.transactionHash}`)
+        logger.info('Processing transfer')

        const receipt = await config.foreign.web3.eth.getTransactionReceipt(transfer.transactionHash)

-        const existsAffirmationEvent = receipt.logs.some(
-          e => e.address === config.foreign.bridgeAddress && e.topics[0] === userRequestForAffirmationHash
-        )
-
-        if (existsAffirmationEvent) {
-          logger.info(
-            `Transfer event discarded because a transaction with alternative receiver detected in transaction ${
-              transfer.transactionHash
-            }`
-          )
+        if (receipt.logs.some(isUserRequestForAffirmation)) {
+          logger.info('Transfer event discarded because affirmation is detected in the same transaction')
          return
        }

-        const existsTokensSwappedEvent = tokensSwappedAbi
-          ? receipt.logs.some(e => e.address === config.foreign.bridgeAddress && e.topics[0] === tokensSwappedHash)
-          : false
+        if (from === ZERO_ADDRESS) {
+          logger.info('Mint-like transfers from zero address are not processed')
+          return
+        }

-        if (from === ZERO_ADDRESS && existsTokensSwappedEvent) {
-          logger.info(
-            `Transfer event discarded because token swap is detected in transaction ${transfer.transactionHash}`
-          )
+        // when bridge performs a withdrawal from Compound, the following three events occur
+        // * token.Transfer(from=cToken, to=bridge, amount=X)
+        // * cToken.Redeem(redeemer=bridge, amount=X, tokens=Y)
+        // * cToken.Transfer(from=bridge, to=cToken, amount=Y)
+        if (receipt.logs.some(isRedeem(from)) && receipt.logs.some(isCTokenTransfer(from))) {
+          logger.info('Transfer event discarded because cToken redeem is detected in the same transaction')
          return
        }

--- a/oracle/src/sender.js
+++ b/oracle/src/sender.js
@ -40,7 +40,7 @@ async function initialize() {
  try {
    const checkHttps = checkHTTPS(process.env.ORACLE_ALLOW_HTTP_FOR_RPC, logger)

-    web3.currentProvider.subProvider.urls.forEach(checkHttps(config.id))
+    web3.currentProvider.urls.forEach(checkHttps(config.id))

    GasPrice.start(config.id)

--- a/oracle/src/services/HttpListProvider.js
+++ b/oracle/src/services/HttpListProvider.js
@ -4,8 +4,12 @@ const { FALLBACK_RPC_URL_SWITCH_TIMEOUT } = require('../utils/constants')

 const { onInjected } = require('./injectedLogger')

+const { ORACLE_JSONRPC_ERROR_CODES } = process.env
+
 // From EIP-1474 and Infura documentation
-const JSONRPC_ERROR_CODES = [-32603, -32002, -32005]
+const JSONRPC_ERROR_CODES = ORACLE_JSONRPC_ERROR_CODES
+  ? ORACLE_JSONRPC_ERROR_CODES.split(',').map(s => parseInt(s, 10))
+  : [-32603, -32002, -32005]

 const defaultOptions = {
  name: 'main',
@ -41,6 +45,20 @@ function HttpListProvider(urls, options = {}) {
  })
 }

+HttpListProvider.prototype.switchToFallbackRPC = function() {
+  if (this.urls.length < 2) {
+    return
+  }
+
+  const prevIndex = this.currentIndex
+  const newIndex = (prevIndex + 1) % this.urls.length
+  this.logger.info(
+    { index: newIndex, oldURL: this.urls[prevIndex], newURL: this.urls[newIndex] },
+    'Switching to fallback JSON-RPC URL'
+  )
+  this.currentIndex = newIndex
+}
+
 HttpListProvider.prototype.send = async function send(payload, callback) {
  // if fallback URL is being used for too long, switch back to the primary URL
  if (this.currentIndex > 0 && Date.now() - this.lastTimeUsedPrimary > FALLBACK_RPC_URL_SWITCH_TIMEOUT) {
--- a/oracle/src/services/SafeEthLogsProvider.js
+++ b/oracle/src/services/SafeEthLogsProvider.js
@ -1,20 +1,13 @@
 const { hexToNumber, isHexStrict } = require('web3').utils

-const { onInjected } = require('./injectedLogger')
-
 function SafeEthLogsProvider(provider) {
-  this.subProvider = provider
-  onInjected(logger => {
-    this.logger = logger.child({ module: 'SafeEthLogsProvider' })
-  })
-}
-
-SafeEthLogsProvider.prototype.send = function send(payload, callback) {
+  const oldSend = provider.send.bind(provider)
+  const newSend = function(payload, callback) {
    if (payload.method === 'eth_getLogs' && isHexStrict(payload.params[0].toBlock)) {
      this.logger.debug('Modifying eth_getLogs request to include batch eth_blockNumber request')

      const newPayload = [payload, { jsonrpc: '2.0', id: payload.id + 1, method: 'eth_blockNumber', params: [] }]
-    this.subProvider.send(newPayload, (err, res) => {
+      oldSend(newPayload, (err, res) => {
        if (err) {
          callback(err, null)
        } else {
@ -32,9 +25,12 @@ SafeEthLogsProvider.prototype.send = function send(payload, callback) {
        }
      })
    } else {
-    this.subProvider.send(payload, callback)
+      oldSend(payload, callback)
    }
  }
+  provider.send = newSend.bind(provider)
+  return provider
+}

 module.exports = {
  SafeEthLogsProvider
--- a/oracle/src/services/web3.js
+++ b/oracle/src/services/web3.js
@ -38,10 +38,10 @@ const foreignOptions = {
  retry: RETRY_CONFIG
 }

-const homeProvider = new SafeEthLogsProvider(new HttpListProvider(homeUrls, homeOptions))
+const homeProvider = SafeEthLogsProvider(new HttpListProvider(homeUrls, homeOptions))
 const web3Home = new Web3(homeProvider)

-const foreignProvider = new SafeEthLogsProvider(new HttpListProvider(foreignUrls, foreignOptions))
+const foreignProvider = SafeEthLogsProvider(new HttpListProvider(foreignUrls, foreignOptions))
 const web3Foreign = new Web3(foreignProvider)

 let web3ForeignArchive = null
--- a/oracle/src/utils/constants.js
+++ b/oracle/src/utils/constants.js
@ -25,6 +25,7 @@ module.exports = {
  },
  DEFAULT_TRANSACTION_RESEND_INTERVAL: 20 * 60 * 1000,
  FALLBACK_RPC_URL_SWITCH_TIMEOUT: 60 * 60 * 1000,
+  BLOCK_NUMBER_PROGRESS_ITERATIONS_LIMIT: 10,
  SENDER_QUEUE_MAX_PRIORITY: 10,
  SENDER_QUEUE_SEND_PRIORITY: 5,
  SENDER_QUEUE_CHECK_STATUS_PRIORITY: 1,
--- a/oracle/src/utils/utils.js
+++ b/oracle/src/utils/utils.js
@ -106,7 +106,11 @@ function isGasPriceError(e) {

 function isSameTransactionError(e) {
  const message = e.message.toLowerCase()
-  return message.includes('transaction with the same hash was already imported') || message.includes('already known')
+  return (
+    message.includes('transaction with the same hash was already imported') ||
+    message.includes('already known') ||
+    message.includes('alreadyknown')
+  )
 }

 function isInsufficientBalanceError(e) {
@ -119,7 +123,8 @@ function isNonceError(e) {
  return (
    message.includes('transaction nonce is too low') ||
    message.includes('nonce too low') ||
-    message.includes('transaction with same nonce in the queue')
+    message.includes('transaction with same nonce in the queue') ||
+    message.includes('oldnonce')
  )
 }

--- a/oracle/src/watcher.js
+++ b/oracle/src/watcher.js
@ -6,7 +6,7 @@ const logger = require('./services/logger')
 const { getShutdownFlag } = require('./services/shutdownState')
 const { getBlockNumber, getRequiredBlockConfirmations, getEvents } = require('./tx/web3')
 const { checkHTTPS, watchdog } = require('./utils/utils')
-const { EXIT_CODES } = require('./utils/constants')
+const { EXIT_CODES, BLOCK_NUMBER_PROGRESS_ITERATIONS_LIMIT } = require('./utils/constants')

 if (process.argv.length < 3) {
  logger.error('Please check the number of arguments, config file was not provided')
@ -29,12 +29,14 @@ const { getTokensState } = require('./utils/tokenState')
 const { web3, bridgeContract, eventContract, startBlock, pollingInterval, chain } = config.main
 const lastBlockRedisKey = `${config.id}:lastProcessedBlock`
 let lastProcessedBlock = Math.max(startBlock - 1, 0)
+let lastSeenBlockNumber = 0
+let sameBlockNumberCounter = 0

 async function initialize() {
  try {
    const checkHttps = checkHTTPS(process.env.ORACLE_ALLOW_HTTP_FOR_RPC, logger)

-    web3.currentProvider.subProvider.urls.forEach(checkHttps(chain))
+    web3.currentProvider.urls.forEach(checkHttps(chain))

    await getLastProcessedBlock()
    connectWatcherToQueue({
@ -117,6 +119,28 @@ async function getLastBlockToProcess(web3, bridgeContract) {
    getBlockNumber(web3),
    getRequiredBlockConfirmations(bridgeContract)
  ])
+
+  if (lastBlockNumber < lastSeenBlockNumber) {
+    sameBlockNumberCounter = 0
+    logger.warn({ lastBlockNumber, lastSeenBlockNumber }, 'Received block number less than already seen block')
+    web3.currentProvider.switchToFallbackRPC()
+  } else if (lastBlockNumber === lastSeenBlockNumber) {
+    sameBlockNumberCounter++
+    if (sameBlockNumberCounter > 1) {
+      logger.info({ lastBlockNumber, sameBlockNumberCounter }, 'Received the same block number more than twice')
+      if (sameBlockNumberCounter >= BLOCK_NUMBER_PROGRESS_ITERATIONS_LIMIT) {
+        sameBlockNumberCounter = 0
+        logger.warn(
+          { lastBlockNumber, n: BLOCK_NUMBER_PROGRESS_ITERATIONS_LIMIT },
+          'Received the same block number for too many times. Probably node is not synced anymore'
+        )
+        web3.currentProvider.switchToFallbackRPC()
+      }
+    }
+  } else {
+    sameBlockNumberCounter = 0
+    lastSeenBlockNumber = lastBlockNumber
+  }
  return lastBlockNumber - requiredBlockConfirmations
 }

@ -132,8 +156,6 @@ async function main({ sendToQueue }) {
      logger.info(`Oracle watcher was unsuspended.`)
    }

-    await checkConditions()
-
    const lastBlockToProcess = await getLastBlockToProcess(web3, bridgeContract)

    if (lastBlockToProcess <= lastProcessedBlock) {
@ -141,6 +163,8 @@ async function main({ sendToQueue }) {
      return
    }

+    await checkConditions()
+
    const fromBlock = lastProcessedBlock + 1
    const rangeEndBlock = config.blockPollingLimit ? fromBlock + config.blockPollingLimit : lastBlockToProcess
    let toBlock = Math.min(lastBlockToProcess, rangeEndBlock)
--- a/parity/chain-foreign.json
+++ b/parity/chain-foreign.json
--- a/parity/foreign_mocks/cDAIMock.sol
+++ b/parity/foreign_mocks/cDAIMock.sol
@ -0,0 +1,33 @@
+pragma solidity 0.4.24;
+
+interface IERC20 {
+  function transferFrom(address from,address to,uint256 value) external;
+  function transfer(address to,uint256 value) external;
+}
+
+contract cDaiMock {
+  IERC20 daiToken;
+
+  event Transfer(address indexed from, address indexed to, uint amount);
+  event Mint(address minter, uint mintAmount, uint mintTokens);
+  event Redeem(address redeemer, uint redeemAmount, uint redeemTokens);
+
+
+  function mint(uint256 mintAmount) external returns (uint256) {
+    daiToken.transferFrom(msg.sender, address(this), mintAmount);
+
+    emit Mint(msg.sender, mintAmount, mintAmount);
+    emit Transfer(address(this), msg.sender, mintAmount);
+
+    return 0;
+  }
+
+  function redeemUnderlying(uint256 redeemAmount) external returns (uint256) {
+    daiToken.transfer(msg.sender, redeemAmount);
+
+    emit Transfer(msg.sender, address(this), redeemAmount);
+    emit Redeem(msg.sender, redeemAmount, redeemAmount);
+
+    return 0;
+  }
+}
--- a/yarn.lock
+++ b/yarn.lock