95 lines
3.1 KiB
TypeScript
95 lines
3.1 KiB
TypeScript
// Third party imports
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import Web3 from 'web3';
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// Application imports
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import { environment } from '@src/environments/environment';
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import { Web3Service } from '@app/_services/web3.service';
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/** Fetch the token registry contract's ABI. */
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const abi: Array<any> = require('@src/assets/js/block-sync/data/TokenUniqueSymbolIndex.json');
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/** Establish a connection to the blockchain network. */
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const web3: Web3 = Web3Service.getInstance();
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/**
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* Provides an instance of the token registry contract.
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* Allows querying of tokens that have been registered as valid tokens in the network.
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*
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* @remarks
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* This is our interface to the token registry contract.
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*/
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export class TokenRegistry {
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/** The instance of the token registry contract. */
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contract: any;
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/** The deployed token registry contract's address. */
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contractAddress: string;
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/** The account address of the account that deployed the token registry contract. */
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signerAddress: string;
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/**
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* Create a connection to the deployed token registry contract.
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*
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* @param contractAddress - The deployed token registry contract's address.
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* @param signerAddress - The account address of the account that deployed the token registry contract.
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*/
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constructor(contractAddress: string, signerAddress?: string) {
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this.contractAddress = contractAddress;
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this.contract = new web3.eth.Contract(abi, this.contractAddress);
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if (signerAddress) {
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this.signerAddress = signerAddress;
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} else {
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this.signerAddress = web3.eth.accounts[0];
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}
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}
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/**
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* Returns the address of the token with a given identifier.
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*
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* @async
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* @example
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* Prints the address of the token with the identifier 'sarafu':
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* ```typescript
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* console.log(await addressOf('sarafu'));
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* ```
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*
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* @param identifier - The name or identifier of the token to be fetched from the token registry.
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* @returns The address of the token assigned the specified identifier in the token registry.
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*/
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public async addressOf(identifier: string): Promise<string> {
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const id: string = web3.eth.abi.encodeParameter('bytes32', web3.utils.toHex(identifier));
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return await this.contract.methods.addressOf(id).call();
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}
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/**
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* Returns the address of a token with the given serial in the token registry.
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*
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* @async
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* @example
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* Prints the address of the token with the serial '2':
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* ```typescript
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* console.log(await entry(2));
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* ```
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*
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* @param serial - The serial number of the token to be fetched.
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* @return The address of the token with the specified serial number.
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*/
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public async entry(serial: number): Promise<string> {
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return await this.contract.methods.entry(serial).call();
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}
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/**
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* Returns the total number of tokens that have been registered in the network.
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*
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* @async
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* @example
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* Prints the total number of registered tokens:
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* ```typescript
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* console.log(await totalTokens());
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* ```
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*
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* @returns The total number of registered tokens.
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*/
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public async totalTokens(): Promise<number> {
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return await this.contract.methods.entryCount().call();
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}
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}
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