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authorFabio Berger <me@fabioberger.com>2017-08-23 23:27:54 +0800
committerFabio Berger <me@fabioberger.com>2017-08-23 23:27:54 +0800
commitfedded3ec1d3051589777a61aba14720432f1d51 (patch)
tree28ad7ff17a979930dacdc8a7ffd9fdeaed27edf2 /src/contract_wrappers
parentd837e27739614ce6a132e8583409425f726bef89 (diff)
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Add public method `getTokenMetadataIfExistsAsync` to TokenRegistry wrapper, refactor `getTokensAsync` to use `getTokenMetadataIfExistsAsync` under the hood and added unit tests
Diffstat (limited to 'src/contract_wrappers')
-rw-r--r--src/contract_wrappers/token_registry_wrapper.ts35
1 files changed, 23 insertions, 12 deletions
diff --git a/src/contract_wrappers/token_registry_wrapper.ts b/src/contract_wrappers/token_registry_wrapper.ts
index eaaea150d..c78b86a88 100644
--- a/src/contract_wrappers/token_registry_wrapper.ts
+++ b/src/contract_wrappers/token_registry_wrapper.ts
@@ -1,6 +1,7 @@
import * as _ from 'lodash';
import {Web3Wrapper} from '../web3_wrapper';
import {Token, TokenRegistryContract, TokenMetadata} from '../types';
+import {constants} from '../utils/constants';
import {ContractWrapper} from './contract_wrapper';
import * as TokenRegistryArtifacts from '../artifacts/TokenRegistry.json';
@@ -20,20 +21,30 @@ export class TokenRegistryWrapper extends ContractWrapper {
const tokenRegistryContract = await this._getTokenRegistryContractAsync();
const addresses = await tokenRegistryContract.getTokenAddresses.call();
- const tokenMetadataPromises: Array<Promise<TokenMetadata>> = _.map(
+ const tokenPromises: Array<Promise<Token|undefined>> = _.map(
addresses,
- (address: string) => (tokenRegistryContract.getTokenMetaData.call(address)),
+ (address: string) => (this.getTokenMetadataIfExistsAsync(address)),
);
- const tokensMetadata = await Promise.all(tokenMetadataPromises);
- const tokens = _.map(tokensMetadata, metadata => {
- return {
- address: metadata[0],
- name: metadata[1],
- symbol: metadata[2],
- decimals: metadata[3].toNumber(),
- };
- });
- return tokens;
+ const tokens = await Promise.all(tokenPromises);
+ return tokens as Token[];
+ }
+ /**
+ * Retrieves a token by address currently listed in the Token Registry smart contract
+ * @return An object that conforms to the Token interface or undefined if token not found.
+ */
+ public async getTokenMetadataIfExistsAsync(address: string): Promise<Token|undefined> {
+ const tokenRegistryContract = await this._getTokenRegistryContractAsync();
+ const metadata = await tokenRegistryContract.getTokenMetaData.call(address);
+ if (metadata[0] === constants.NULL_ADDRESS) {
+ return undefined;
+ }
+ const token = {
+ address: metadata[0],
+ name: metadata[1],
+ symbol: metadata[2],
+ decimals: metadata[3].toNumber(),
+ };
+ return token;
}
private _invalidateContractInstance(): void {
delete this._tokenRegistryContractIfExists;