Add TokenRegistryWrapper and getTokensAsync method

1 files changed, 33 insertions, 0 deletions

diff --git a/src/contract_wrappers/token_registry_wrapper.ts b/src/contract_wrappers/token_registry_wrapper.ts
new file mode 100644
index 000000000..4d6eacb51
--- /dev/null
+++ b/src/contract_wrappers/token_registry_wrapper.ts
@@ -0,0 +1,33 @@
+import * as _ from 'lodash';
+import {Web3Wrapper} from '../web3_wrapper';
+import {ZeroExError, Token, TokenRegistryContract} from '../types';
+import {assert} from '../utils/assert';
+import {ContractWrapper} from './contract_wrapper';
+import * as TokenRegistryArtifacts from '../artifacts/TokenRegistry.json';
+
+export class TokenRegistryWrapper extends ContractWrapper {
+    constructor(web3Wrapper: Web3Wrapper) {
+        super(web3Wrapper);
+    }
+    public async getTokensAsync(): Promise<Token[]> {
+        const contractInstance = await this.instantiateContractIfExistsAsync((TokenRegistryArtifacts as any));
+        const tokenRegistryContract = contractInstance as TokenRegistryContract;
+
+        const addresses = await tokenRegistryContract.getTokenAddresses.call();
+        const tokenMetadataPromises: Array<Promise<any[]>> = _.map(
+            addresses,
+            (address: string) => (tokenRegistryContract.getTokenMetaData.call(address)),
+        );
+        const tokensMetadata = await Promise.all(tokenMetadataPromises);
+        const tokens = _.map(tokensMetadata, metadata => {
+            return {
+                address: metadata[0],
+                name: metadata[1],
+                symbol: metadata[2],
+                url: metadata[3],
+                decimals: metadata[4].toNumber(),
+            };
+        });
+        return tokens;
+    }
+}