aboutsummaryrefslogtreecommitdiffstats
path: root/src/web3_wrapper.ts
blob: 5bff25233f1e0f239f49b6c86757b7bb101a334d (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
import * as _ from 'lodash';
import * as Web3 from 'web3';
import * as BigNumber from 'bignumber.js';
import promisify = require('es6-promisify');
import {Web3Provider} from './types';

export class Web3Wrapper {
    private web3: Web3;
    constructor(provider: Web3Provider) {
        this.web3 = new Web3();
        this.web3.setProvider(provider);
    }
    public setProvider(provider: Web3Provider) {
        this.web3.setProvider(provider);
    }
    public isAddress(address: string): boolean {
        return this.web3.isAddress(address);
    }
    public async isSenderAddressAvailableAsync(senderAddress: string): Promise<boolean> {
        const addresses = await this.getAvailableAddressesAsync();
        return _.includes(addresses, senderAddress);
    }
    public async getNodeVersionAsync(): Promise<string> {
        const nodeVersion = await promisify(this.web3.version.getNode)();
        return nodeVersion;
    }
    public getCurrentProvider(): Web3Provider {
        return this.web3.currentProvider;
    }
    public async getNetworkIdIfExistsAsync(): Promise<number|undefined> {
        try {
            const networkId = await this.getNetworkAsync();
            return Number(networkId);
        } catch (err) {
            return undefined;
        }
    }
    public async getBalanceInEthAsync(owner: string): Promise<BigNumber.BigNumber> {
        const balanceInWei = await promisify(this.web3.eth.getBalance)(owner);
        const balanceEth = this.web3.fromWei(balanceInWei, 'ether');
        return balanceEth;
    }
    public async doesContractExistAtAddressAsync(address: string): Promise<boolean> {
        const code = await promisify(this.web3.eth.getCode)(address);
        // Regex matches 0x0, 0x00, 0x in order to accommodate poorly implemented clients
        const codeIsEmpty = /^0x0{0,40}$/i.test(code);
        return !codeIsEmpty;
    }
    public async signTransactionAsync(address: string, message: string): Promise<string> {
        const signData = await promisify(this.web3.eth.sign)(address, message);
        return signData;
    }
    public async getBlockTimestampAsync(blockHash: string): Promise<number> {
        const {timestamp} = await promisify(this.web3.eth.getBlock)(blockHash);
        return timestamp;
    }
    public async getAvailableAddressesAsync(): Promise<string[]> {
        const addresses: string[] = await promisify(this.web3.eth.getAccounts)();
        return addresses;
    }
    private async getNetworkAsync(): Promise<number> {
        const networkId = await promisify(this.web3.version.getNetwork)();
        return networkId;
    }
}