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-rw-r--r--src/stores/block_store.ts38
1 files changed, 38 insertions, 0 deletions
diff --git a/src/stores/block_store.ts b/src/stores/block_store.ts
new file mode 100644
index 000000000..d1b4d3c54
--- /dev/null
+++ b/src/stores/block_store.ts
@@ -0,0 +1,38 @@
+import * as _ from 'lodash';
+import * as Web3 from 'web3';
+import {BigNumber} from 'bignumber.js';
+import {BlockParamLiteral, InternalZeroExError} from '../types';
+import {Web3Wrapper} from '../web3_wrapper';
+
+/**
+ * Store for a current latest block number
+ */
+export class BlockStore {
+ private web3Wrapper?: Web3Wrapper;
+ private latestBlockNumber?: number;
+ constructor(web3Wrapper?: Web3Wrapper) {
+ this.web3Wrapper = web3Wrapper;
+ // TODO start a subscription
+ }
+ public getBlockNumberWithNConfirmations(numConfirmations: number): Web3.BlockParam {
+ let blockNumber;
+ if (numConfirmations === 0) {
+ blockNumber = BlockParamLiteral.Pending;
+ } else if (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 - numConfirmations + 1;
+ }
+ return blockNumber;
+ }
+ public setLatestBlock(latestBlockNumber: number): void {
+ this.latestBlockNumber = latestBlockNumber;
+ }
+}