Remove blockStore and default to numConfirmations === 0

7 files changed, 16 insertions, 111 deletions

diff --git a/src/order_watcher/event_watcher.ts b/src/order_watcher/event_watcher.ts
index 7e27d5e79..81529a98c 100644
--- a/src/order_watcher/event_watcher.ts
+++ b/src/order_watcher/event_watcher.ts
@@ -11,7 +11,6 @@ import {AbiDecoder} from '../utils/abi_decoder';
 import {intervalUtils} from '../utils/interval_utils';
 import {assert} from '../utils/assert';
 import {utils} from '../utils/utils';
-import {BlockStore} from '../stores/block_store';
 
 const DEFAULT_EVENT_POLLING_INTERVAL = 200;
 
@@ -29,10 +28,8 @@ export class EventWatcher {
     private _pollingIntervalMs: number;
     private _intervalIdIfExists?: NodeJS.Timer;
     private _lastEvents: Web3.LogEntry[] = [];
-    private _blockStore: BlockStore;
-    constructor(web3Wrapper: Web3Wrapper, blockStore: BlockStore, pollingIntervalMs: undefined|number) {
+    constructor(web3Wrapper: Web3Wrapper, pollingIntervalMs: undefined|number) {
         this._web3Wrapper = web3Wrapper;
-        this._blockStore = blockStore;
         this._pollingIntervalMs = _.isUndefined(pollingIntervalMs) ?
                                     DEFAULT_EVENT_POLLING_INTERVAL :
                                     pollingIntervalMs;
@@ -68,10 +65,9 @@ export class EventWatcher {
         this._lastEvents = pendingEvents;
     }
     private async _getEventsAsync(): Promise<Web3.LogEntry[]> {
-        const blockNumber = this._blockStore.getBlockNumber();
         const eventFilter = {
-            fromBlock: blockNumber,
-            toBlock: blockNumber,
+            fromBlock: BlockParamLiteral.Pending,
+            toBlock: BlockParamLiteral.Pending,
         };
         const events = await this._web3Wrapper.getLogsAsync(eventFilter);
         return events;
diff --git a/src/order_watcher/order_state_watcher.ts b/src/order_watcher/order_state_watcher.ts
index ab80f231f..c40131bcb 100644
--- a/src/order_watcher/order_state_watcher.ts
+++ b/src/order_watcher/order_state_watcher.ts
@@ -26,7 +26,6 @@ import {
     ZeroExError,
 } from '../types';
 import {Web3Wrapper} from '../web3_wrapper';
-import {BlockStore} from '../stores/block_store';
 import {TokenWrapper} from '../contract_wrappers/token_wrapper';
 import {ExchangeWrapper} from '../contract_wrappers/exchange_wrapper';
 import {OrderFilledCancelledLazyStore} from '../stores/order_filled_cancelled_lazy_store';
@@ -60,7 +59,6 @@ export class OrderStateWatcher {
     private _exchange: ExchangeWrapper;
     private _abiDecoder: AbiDecoder;
     private _orderStateUtils: OrderStateUtils;
-    private _blockStore: BlockStore;
     private _orderFilledCancelledLazyStore: OrderFilledCancelledLazyStore;
     private _balanceAndProxyAllowanceLazyStore: BalanceAndProxyAllowanceLazyStore;
     constructor(
@@ -75,19 +73,11 @@ export class OrderStateWatcher {
         this._dependentOrderHashes = {};
         const eventPollingIntervalMs = _.isUndefined(config) ? undefined : config.eventPollingIntervalMs;
         const blockPollingIntervalMs = _.isUndefined(config) ? undefined : config.blockPollingIntervalMs;
-        const numConfirmations = (_.isUndefined(config) || _.isUndefined(config.numConfirmations)) ?
-                                 DEFAULT_NUM_CONFIRMATIONS :
-                                 config.numConfirmations;
-        this._blockStore = new BlockStore(numConfirmations, this._web3Wrapper, blockPollingIntervalMs);
-        this._eventWatcher = new EventWatcher(
-            web3Wrapper, this._blockStore, eventPollingIntervalMs,
-        );
+        this._eventWatcher = new EventWatcher(web3Wrapper, eventPollingIntervalMs);
         this._balanceAndProxyAllowanceLazyStore = new BalanceAndProxyAllowanceLazyStore(
-            this._token, this._blockStore,
-        );
-        this._orderFilledCancelledLazyStore = new OrderFilledCancelledLazyStore(
-            this._exchange, this._blockStore,
+            this._token,
         );
+        this._orderFilledCancelledLazyStore = new OrderFilledCancelledLazyStore(this._exchange);
         this._orderStateUtils = new OrderStateUtils(
             this._balanceAndProxyAllowanceLazyStore, this._orderFilledCancelledLazyStore,
         );
@@ -123,12 +113,11 @@ export class OrderStateWatcher {
      * @param   callback            Receives the orderHash of the order that should be re-validated, together
      *                              with all the order-relevant blockchain state needed to re-validate the order.
      */
-    public async subscribeAsync(callback: OnOrderStateChangeCallback): Promise<void> {
+    public subscribe(callback: OnOrderStateChangeCallback): void {
         assert.isFunction('callback', callback);
         if (!_.isUndefined(this._callbackIfExistsAsync)) {
             throw new Error(ZeroExError.SubscriptionAlreadyPresent);
         }
-        await this._blockStore.startAsync();
         this._callbackIfExistsAsync = callback;
         this._eventWatcher.subscribe(this._onEventWatcherCallbackAsync.bind(this));
     }
@@ -139,7 +128,6 @@ export class OrderStateWatcher {
         if (_.isUndefined(this._callbackIfExistsAsync)) {
             throw new Error(ZeroExError.SubscriptionNotFound);
         }
-        this._blockStore.stop();
         this._balanceAndProxyAllowanceLazyStore.deleteAll();
         this._orderFilledCancelledLazyStore.deleteAll();
         delete this._callbackIfExistsAsync;
diff --git a/src/stores/balance_proxy_allowance_lazy_store.ts b/src/stores/balance_proxy_allowance_lazy_store.ts
index 88152e145..5c54fbb3b 100644
--- a/src/stores/balance_proxy_allowance_lazy_store.ts
+++ b/src/stores/balance_proxy_allowance_lazy_store.ts
@@ -2,14 +2,13 @@ import * as _ from 'lodash';
 import * as Web3 from 'web3';
 import {BigNumber} from 'bignumber.js';
 import {TokenWrapper} from '../contract_wrappers/token_wrapper';
-import {BlockStore} from './block_store';
+import {BlockParamLiteral} from '../types';
 
 /**
  * Copy on read store for balances/proxyAllowances of tokens/accounts
  */
 export class BalanceAndProxyAllowanceLazyStore {
     private token: TokenWrapper;
-    private blockStore: BlockStore;
     private balance: {
         [tokenAddress: string]: {
             [userAddress: string]: BigNumber,
@@ -20,17 +19,15 @@ export class BalanceAndProxyAllowanceLazyStore {
             [userAddress: string]: BigNumber,
         },
     };
-    constructor(token: TokenWrapper, blockStore: BlockStore) {
+    constructor(token: TokenWrapper) {
         this.token = token;
-        this.blockStore = blockStore;
         this.balance = {};
         this.proxyAllowance = {};
     }
     public async getBalanceAsync(tokenAddress: string, userAddress: string): Promise<BigNumber> {
         if (_.isUndefined(this.balance[tokenAddress]) || _.isUndefined(this.balance[tokenAddress][userAddress])) {
-            const defaultBlock = this.blockStore.getBlockNumber();
             const methodOpts = {
-                defaultBlock,
+                defaultBlock: BlockParamLiteral.Pending,
             };
             const balance = await this.token.getBalanceAsync(tokenAddress, userAddress, methodOpts);
             this.setBalance(tokenAddress, userAddress, balance);
@@ -52,9 +49,8 @@ export class BalanceAndProxyAllowanceLazyStore {
     public async getProxyAllowanceAsync(tokenAddress: string, userAddress: string): Promise<BigNumber> {
         if (_.isUndefined(this.proxyAllowance[tokenAddress]) ||
             _.isUndefined(this.proxyAllowance[tokenAddress][userAddress])) {
-            const defaultBlock = this.blockStore.getBlockNumber();
             const methodOpts = {
-                defaultBlock,
+                defaultBlock: BlockParamLiteral.Pending,
             };
             const proxyAllowance = await this.token.getProxyAllowanceAsync(tokenAddress, userAddress, methodOpts);
             this.setProxyAllowance(tokenAddress, userAddress, proxyAllowance);
diff --git a/src/stores/block_store.ts b/src/stores/block_store.ts
deleted file mode 100644
index ae9c232bb..000000000
--- a/src/stores/block_store.ts
+++ /dev/null
@@ -1,66 +0,0 @@
-import * as _ from 'lodash';
-import * as Web3 from 'web3';
-import {BigNumber} from 'bignumber.js';
-import {BlockParamLiteral, InternalZeroExError, ZeroExError} from '../types';
-import {Web3Wrapper} from '../web3_wrapper';
-import {intervalUtils} from '../utils/interval_utils';
-
-const DEFAULT_BLOCK_POLLING_INTERVAL_MS = 500;
-
-/**
- * Store for a current latest block number
- */
-export class BlockStore {
-    private web3Wrapper?: Web3Wrapper;
-    private latestBlockNumber?: number;
-    private intervalId?: NodeJS.Timer;
-    private blockPollingIntervalMs: number;
-    private numConfirmations: number;
-    constructor(numConfirmations: number, web3Wrapper?: Web3Wrapper, blockPollingIntervalMs?: number) {
-        this.numConfirmations = numConfirmations;
-        this.web3Wrapper = web3Wrapper;
-        this.blockPollingIntervalMs = blockPollingIntervalMs || DEFAULT_BLOCK_POLLING_INTERVAL_MS;
-    }
-    public getBlockNumber(): Web3.BlockParam {
-        let blockNumber;
-        if (this.numConfirmations === 0) {
-            blockNumber = BlockParamLiteral.Pending;
-        } else if (this.numConfirmations === 1) {
-            // HACK: We special-case `numConfirmations === 1` so that we can use this block store without actually
-            // setting `latestBlockNumber` when block number is latest (in order validation) whhich allows us to omit
-            // an async call in a constructor of `ExchangeTransferSimulator`
-            blockNumber = BlockParamLiteral.Latest;
-        } else {
-            if (_.isUndefined(this.latestBlockNumber)) {
-                throw new Error(InternalZeroExError.LatestBlockNumberNotSet);
-            }
-            // Latest block already has 1 confirmation
-            blockNumber = this.latestBlockNumber - this.numConfirmations + 1;
-        }
-        return blockNumber;
-    }
-    public async startAsync(): Promise<void> {
-        if (this.numConfirmations === 0 || this.numConfirmations === 1) {
-            return; // no-op
-        }
-        await this.updateLatestBlockAsync();
-        this.intervalId = intervalUtils.setAsyncExcludingInterval(
-            this.updateLatestBlockAsync.bind(this), this.blockPollingIntervalMs,
-        );
-    }
-    public stop(): void {
-        if (!_.isUndefined(this.intervalId)) {
-            intervalUtils.clearAsyncExcludingInterval(this.intervalId);
-        }
-    }
-    private async updateLatestBlockAsync(): Promise<void> {
-        if (_.isUndefined(this.web3Wrapper)) {
-            throw new Error(InternalZeroExError.Web3WrapperRequiredToStartBlockStore);
-        }
-        const block = await this.web3Wrapper.getBlockAsync(BlockParamLiteral.Latest);
-        if (_.isNull(block.number)) {
-            throw new Error(ZeroExError.FailedToFetchLatestBlock);
-        }
-        this.latestBlockNumber = block.number;
-    }
-}
diff --git a/src/stores/order_filled_cancelled_lazy_store.ts b/src/stores/order_filled_cancelled_lazy_store.ts
index 104a8240e..39adff4d1 100644
--- a/src/stores/order_filled_cancelled_lazy_store.ts
+++ b/src/stores/order_filled_cancelled_lazy_store.ts
@@ -2,31 +2,28 @@ import * as _ from 'lodash';
 import * as Web3 from 'web3';
 import {BigNumber} from 'bignumber.js';
 import {ExchangeWrapper} from '../contract_wrappers/exchange_wrapper';
-import {BlockStore} from './block_store';
+import {BlockParamLiteral} from '../types';
 
 /**
  * Copy on read store for filled/cancelled taker  amounts
  */
 export class OrderFilledCancelledLazyStore {
     private exchange: ExchangeWrapper;
-    private blockStore: BlockStore;
     private filledTakerAmount: {
         [orderHash: string]: BigNumber,
     };
     private cancelledTakerAmount: {
         [orderHash: string]: BigNumber,
     };
-    constructor(exchange: ExchangeWrapper, blockStore: BlockStore) {
+    constructor(exchange: ExchangeWrapper) {
         this.exchange = exchange;
-        this.blockStore = blockStore;
         this.filledTakerAmount = {};
         this.cancelledTakerAmount = {};
     }
     public async getFilledTakerAmountAsync(orderHash: string): Promise<BigNumber> {
         if (_.isUndefined(this.filledTakerAmount[orderHash])) {
-            const defaultBlock = this.blockStore.getBlockNumber();
             const methodOpts = {
-                defaultBlock,
+                defaultBlock: BlockParamLiteral.Pending,
             };
             const filledTakerAmount = await this.exchange.getFilledTakerAmountAsync(orderHash, methodOpts);
             this.setFilledTakerAmount(orderHash, filledTakerAmount);
@@ -42,9 +39,8 @@ export class OrderFilledCancelledLazyStore {
     }
     public async getCancelledTakerAmountAsync(orderHash: string): Promise<BigNumber> {
         if (_.isUndefined(this.cancelledTakerAmount[orderHash])) {
-            const defaultBlock = this.blockStore.getBlockNumber();
             const methodOpts = {
-                defaultBlock,
+                defaultBlock: BlockParamLiteral.Pending,
             };
             const cancelledTakerAmount = await this.exchange.getCanceledTakerAmountAsync(orderHash, methodOpts);
             this.setCancelledTakerAmount(orderHash, cancelledTakerAmount);
diff --git a/src/types.ts b/src/types.ts
index 555fef855..b34dbfb4e 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -402,12 +402,10 @@ export interface JSONRPCPayload {
 /*
  * eventPollingIntervalMs: How often to poll the Ethereum node for new events
  * blockPollingIntervalMs: How often to poll the Ethereum node for new blocks
- * numConfirmations: How many confirmed blocks deep you wish to listen for events at.
  */
 export interface OrderStateWatcherConfig {
     eventPollingIntervalMs?: number;
     blockPollingIntervalMs?: number;
-    numConfirmations?: number;
 }
 
 /*
diff --git a/src/utils/exchange_transfer_simulator.ts b/src/utils/exchange_transfer_simulator.ts
index 475dcf953..308ef06db 100644
--- a/src/utils/exchange_transfer_simulator.ts
+++ b/src/utils/exchange_transfer_simulator.ts
@@ -3,7 +3,6 @@ import BigNumber from 'bignumber.js';
 import {ExchangeContractErrs, TradeSide, TransferType, BlockParamLiteral} from '../types';
 import {TokenWrapper} from '../contract_wrappers/token_wrapper';
 import {BalanceAndProxyAllowanceLazyStore} from '../stores/balance_proxy_allowance_lazy_store';
-import {BlockStore} from '../stores/block_store';
 
 enum FailureReason {
     Balance = 'balance',
@@ -37,9 +36,7 @@ export class ExchangeTransferSimulator {
     private store: BalanceAndProxyAllowanceLazyStore;
     private UNLIMITED_ALLOWANCE_IN_BASE_UNITS: BigNumber;
     constructor(token: TokenWrapper) {
-        const latestBlockConfirmationNumber = 1;
-        const blockStore = new BlockStore(latestBlockConfirmationNumber);
-        this.store = new BalanceAndProxyAllowanceLazyStore(token, blockStore);
+        this.store = new BalanceAndProxyAllowanceLazyStore(token);
         this.UNLIMITED_ALLOWANCE_IN_BASE_UNITS = token.UNLIMITED_ALLOWANCE_IN_BASE_UNITS;
     }
     /**