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
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
import * as _ from 'lodash';
import * as Web3 from 'web3';
import * as BigNumber from 'bignumber.js';
import promisify = require('es6-promisify');
import {ZeroExError, Artifact} from './types';
import {Contract} from './contract';
export class Web3Wrapper {
private web3: Web3;
private defaults: Partial<Web3.TxData>;
private networkIdIfExists?: number;
private jsonRpcRequestId: number;
constructor(provider: Web3.Provider, defaults: Partial<Web3.TxData>) {
this.web3 = new Web3();
this.web3.setProvider(provider);
this.defaults = defaults;
this.jsonRpcRequestId = 0;
}
public setProvider(provider: Web3.Provider) {
delete this.networkIdIfExists;
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 async getTransactionReceiptAsync(txHash: string): Promise<Web3.TransactionReceipt> {
const transactionReceipt = await promisify(this.web3.eth.getTransactionReceipt)(txHash);
return transactionReceipt;
}
public getCurrentProvider(): Web3.Provider {
return this.web3.currentProvider;
}
public async getNetworkIdIfExistsAsync(): Promise<number|undefined> {
if (!_.isUndefined(this.networkIdIfExists)) {
return this.networkIdIfExists;
}
try {
const networkId = await this.getNetworkAsync();
this.networkIdIfExists = Number(networkId);
return this.networkIdIfExists;
} catch (err) {
return undefined;
}
}
public async getContractInstanceFromArtifactAsync<A extends Web3.ContractInstance>(artifact: Artifact,
address?: string): Promise<A> {
let contractAddress: string;
if (_.isUndefined(address)) {
const networkIdIfExists = await this.getNetworkIdIfExistsAsync();
if (_.isUndefined(networkIdIfExists)) {
throw new Error(ZeroExError.NoNetworkId);
}
if (_.isUndefined(artifact.networks[networkIdIfExists])) {
throw new Error(ZeroExError.ContractNotDeployedOnNetwork);
}
contractAddress = artifact.networks[networkIdIfExists].address.toLowerCase();
} else {
contractAddress = address;
}
const doesContractExist = await this.doesContractExistAtAddressAsync(contractAddress);
if (!doesContractExist) {
throw new Error(ZeroExError.ContractDoesNotExist);
}
const contractInstance = this.getContractInstance<A>(
artifact.abi, contractAddress,
);
return contractInstance;
}
public toWei(ethAmount: BigNumber.BigNumber): BigNumber.BigNumber {
const balanceWei = this.web3.toWei(ethAmount, 'ether');
return balanceWei;
}
public async getBalanceInWeiAsync(owner: string): Promise<BigNumber.BigNumber> {
let balanceInWei = await promisify(this.web3.eth.getBalance)(owner);
balanceInWei = new BigNumber(balanceInWei);
return balanceInWei;
}
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 getBlockAsync(blockParam: string|Web3.BlockParam): Promise<Web3.BlockWithoutTransactionData> {
const block = await promisify(this.web3.eth.getBlock)(blockParam);
return block;
}
public async getBlockTimestampAsync(blockParam: string|Web3.BlockParam): Promise<number> {
const {timestamp} = await this.getBlockAsync(blockParam);
return timestamp;
}
public async getAvailableAddressesAsync(): Promise<string[]> {
const addresses: string[] = await promisify(this.web3.eth.getAccounts)();
return addresses;
}
public async getLogsAsync(filter: Web3.FilterObject): Promise<Web3.LogEntry[]> {
const payload = {
jsonrpc: '2.0',
id: this.jsonRpcRequestId++,
method: 'eth_getLogs',
params: [filter],
};
const logs = await this.sendRawPayloadAsync(payload);
return logs;
}
public keccak256(data: string): string {
const hash = this.web3.sha3(data);
return hash;
}
private getContractInstance<A extends Web3.ContractInstance>(abi: Web3.ContractAbi, address: string): A {
const web3ContractInstance = this.web3.eth.contract(abi).at(address);
const contractInstance = new Contract(web3ContractInstance, this.defaults) as any as A;
return contractInstance;
}
private async getNetworkAsync(): Promise<number> {
const networkId = await promisify(this.web3.version.getNetwork)();
return networkId;
}
private async sendRawPayloadAsync(payload: Web3.JSONRPCRequestPayload): Promise<any> {
const sendAsync = this.web3.currentProvider.sendAsync.bind(this.web3.currentProvider);
const response = await promisify(sendAsync)(payload);
const result = response.result;
return result;
}
}
|
