4 files changed, 16 insertions, 14 deletions

diff --git a/packages/order-watcher/CHANGELOG.json b/packages/order-watcher/CHANGELOG.json
index a66db6eec..e747a2129 100644
--- a/packages/order-watcher/CHANGELOG.json
+++ b/packages/order-watcher/CHANGELOG.json
@@ -9,6 +9,14 @@
             {
                 "note": "Do not stop subscription if error is encountered",
                 "pr": 825
+            },
+            {
+                "note": "Fixed a bug that caused the incorrect block to be fetched via JSON-RPC within Blockstream",
+                "pr": 875
+            },
+            {
+                "note": "Remove stateLayer config from OrderWatcher. It now always operates on the latest block",
+                "pr": 875
             }
         ],
         "timestamp": 1531149657
diff --git a/packages/order-watcher/src/order_watcher/event_watcher.ts b/packages/order-watcher/src/order_watcher/event_watcher.ts
index 68c043dfe..415a7d99a 100644
--- a/packages/order-watcher/src/order_watcher/event_watcher.ts
+++ b/packages/order-watcher/src/order_watcher/event_watcher.ts
@@ -30,7 +30,7 @@ export class EventWatcher {
     constructor(
         provider: Provider,
         pollingIntervalIfExistsMs: undefined | number,
-        stateLayer: BlockParamLiteral = BlockParamLiteral.Latest,
+        stateLayer: BlockParamLiteral,
         isVerbose: boolean,
     ) {
         this._isVerbose = isVerbose;
@@ -61,13 +61,9 @@ export class EventWatcher {
         if (!_.isUndefined(this._blockAndLogStreamerIfExists)) {
             throw new Error(OrderWatcherError.SubscriptionAlreadyPresent);
         }
-        const eventFilter = {
-            fromBlock: this._stateLayer,
-            toBlock: this._stateLayer,
-        };
         this._blockAndLogStreamerIfExists = new BlockAndLogStreamer(
-            this._web3Wrapper.getBlockAsync.bind(this._web3Wrapper, this._stateLayer),
-            this._web3Wrapper.getLogsAsync.bind(this._web3Wrapper, eventFilter),
+            this._web3Wrapper.getBlockAsync.bind(this._web3Wrapper),
+            this._web3Wrapper.getLogsAsync.bind(this._web3Wrapper),
             this._onBlockAndLogStreamerError.bind(this),
         );
         const catchAllLogFilter = {};
@@ -104,7 +100,7 @@ export class EventWatcher {
         await this._emitDifferencesAsync(log, isRemoved ? LogEventState.Removed : LogEventState.Added, callback);
     }
     private async _reconcileBlockAsync(): Promise<void> {
-        const latestBlock = await this._web3Wrapper.getBlockAsync(BlockParamLiteral.Latest);
+        const latestBlock = await this._web3Wrapper.getBlockAsync(this._stateLayer);
         // We need to coerce to Block type cause Web3.Block includes types for mempool blocks
         if (!_.isUndefined(this._blockAndLogStreamerIfExists)) {
             // If we clear the interval while fetching the block - this._blockAndLogStreamer will be undefined
diff --git a/packages/order-watcher/src/order_watcher/order_watcher.ts b/packages/order-watcher/src/order_watcher/order_watcher.ts
index c43887b77..ebfac4b25 100644
--- a/packages/order-watcher/src/order_watcher/order_watcher.ts
+++ b/packages/order-watcher/src/order_watcher/order_watcher.ts
@@ -58,7 +58,6 @@ interface OrderStateByOrderHash {
 }
 
 const DEFAULT_ORDER_WATCHER_CONFIG: OrderWatcherConfig = {
-    stateLayer: BlockParamLiteral.Latest,
     orderExpirationCheckingIntervalMs: 50,
     eventPollingIntervalMs: 200,
     expirationMarginMs: 0,
@@ -66,6 +65,7 @@ const DEFAULT_ORDER_WATCHER_CONFIG: OrderWatcherConfig = {
     cleanupJobIntervalMs: 1000 * 60 * 60, // 1h
     isVerbose: true,
 };
+const STATE_LAYER = BlockParamLiteral.Latest;
 
 /**
  * This class includes all the functionality related to watching a set of orders
@@ -110,20 +110,20 @@ export class OrderWatcher {
         this._eventWatcher = new EventWatcher(
             provider,
             config.eventPollingIntervalMs,
-            config.stateLayer,
+            STATE_LAYER,
             config.isVerbose,
         );
         const balanceAndProxyAllowanceFetcher = new AssetBalanceAndProxyAllowanceFetcher(
             contractWrappers.erc20Token,
             contractWrappers.erc721Token,
-            config.stateLayer,
+            STATE_LAYER,
         );
         this._balanceAndProxyAllowanceLazyStore = new BalanceAndProxyAllowanceLazyStore(
             balanceAndProxyAllowanceFetcher,
         );
         const orderFilledCancelledFetcher = new OrderFilledCancelledFetcher(
             contractWrappers.exchange,
-            config.stateLayer,
+            STATE_LAYER,
         );
         this._orderFilledCancelledLazyStore = new OrderFilledCancelledLazyStore(orderFilledCancelledFetcher);
         this._orderStateUtils = new OrderStateUtils(balanceAndProxyAllowanceFetcher, orderFilledCancelledFetcher);
diff --git a/packages/order-watcher/src/types.ts b/packages/order-watcher/src/types.ts
index 7991df58c..b5637bd91 100644
--- a/packages/order-watcher/src/types.ts
+++ b/packages/order-watcher/src/types.ts
@@ -9,7 +9,6 @@ export enum OrderWatcherError {
 export type EventWatcherCallback = (err: null | Error, log?: LogEntryEvent) => void;
 
 /**
- * stateLayer: Optional blockchain state layer OrderWatcher will monitor for new events. Default=latest.
  * orderExpirationCheckingIntervalMs: How often to check for expired orders. Default=50.
  * eventPollingIntervalMs: How often to poll the Ethereum node for new events. Default=200.
  * expirationMarginMs: Amount of time before order expiry that you'd like to be notified
@@ -18,7 +17,6 @@ export type EventWatcherCallback = (err: null | Error, log?: LogEntryEvent) => v
  * isVerbose: Weather the order watcher should be verbose. Default=true.
  */
 export interface OrderWatcherConfig {
-    stateLayer: BlockParamLiteral;
     orderExpirationCheckingIntervalMs: number;
     eventPollingIntervalMs: number;
     expirationMarginMs: number;