aboutsummaryrefslogtreecommitdiffstats
path: root/packages/web3-wrapper/src/web3_wrapper.ts
blob: 559bf3ea9fc3f1b28c7d3c3d5a0beb33669f8611 (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
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
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
import { AbiDecoder, addressUtils, BigNumber, intervalUtils, promisify } from '@0xproject/utils';
import {
    BlockParam,
    BlockWithoutTransactionData,
    CallData,
    ContractAbi,
    FilterObject,
    JSONRPCRequestPayload,
    JSONRPCResponsePayload,
    LogEntry,
    Provider,
    RawLogEntry,
    TransactionReceipt,
    TransactionReceiptWithDecodedLogs,
    TxData,
} from 'ethereum-types';
import * as _ from 'lodash';
import * as Web3 from 'web3';

import { Web3WrapperErrors } from './types';

const BASE_TEN = 10;

// These are unique identifiers contained in the response of the
// web3_clientVersion call.
export const uniqueVersionIds = {
    geth: 'Geth',
    ganache: 'EthereumJS TestRPC',
};

/**
 * A wrapper around the Web3.js 0.x library that provides a consistent, clean promise-based interface.
 */
export class Web3Wrapper {
    /**
     * Flag to check if this instance is of type Web3Wrapper
     */
    public isZeroExWeb3Wrapper = true;
    public abiDecoder: AbiDecoder;
    private _web3: Web3;
    private _txDefaults: Partial<TxData>;
    private _jsonRpcRequestId: number;
    /**
     * Check if an address is a valid Ethereum address
     * @param address Address to check
     * @returns Whether the address is a valid Ethereum address
     */
    public static isAddress(address: string): boolean {
        return addressUtils.isAddress(address);
    }
    /**
     * A unit amount is defined as the amount of a token above the specified decimal places (integer part).
     * E.g: If a currency has 18 decimal places, 1e18 or one quintillion of the currency is equivalent
     * to 1 unit.
     * @param   amount      The amount in baseUnits that you would like converted to units.
     * @param   decimals    The number of decimal places the unit amount has.
     * @return  The amount in units.
     */
    public static toUnitAmount(amount: BigNumber, decimals: number): BigNumber {
        const aUnit = new BigNumber(BASE_TEN).pow(decimals);
        const unit = amount.div(aUnit);
        return unit;
    }
    /**
     * A baseUnit is defined as the smallest denomination of a token. An amount expressed in baseUnits
     * is the amount expressed in the smallest denomination.
     * E.g: 1 unit of a token with 18 decimal places is expressed in baseUnits as 1000000000000000000
     * @param   amount      The amount of units that you would like converted to baseUnits.
     * @param   decimals    The number of decimal places the unit amount has.
     * @return  The amount in baseUnits.
     */
    public static toBaseUnitAmount(amount: BigNumber, decimals: number): BigNumber {
        const unit = new BigNumber(BASE_TEN).pow(decimals);
        const baseUnitAmount = amount.times(unit);
        const hasDecimals = baseUnitAmount.decimalPlaces() !== 0;
        if (hasDecimals) {
            throw new Error(`Invalid unit amount: ${amount.toString()} - Too many decimal places`);
        }
        return baseUnitAmount;
    }
    /**
     * Convert an Ether amount from ETH to Wei
     * @param ethAmount Amount of Ether to convert to wei
     * @returns Amount in wei
     */
    public static toWei(ethAmount: BigNumber): BigNumber {
        const ETH_DECIMALS = 18;
        const balanceWei = Web3Wrapper.toBaseUnitAmount(ethAmount, ETH_DECIMALS);
        return balanceWei;
    }
    /**
     * Instantiates a new Web3Wrapper.
     * @param   provider    The Web3 provider instance you would like the Web3Wrapper to use for interacting with
     *                      the backing Ethereum node.
     * @param   txDefaults  Override TxData defaults sent with RPC requests to the backing Ethereum node.
     * @return  An instance of the Web3Wrapper class.
     */
    constructor(provider: Provider, txDefaults?: Partial<TxData>) {
        if (_.isUndefined((provider as any).sendAsync)) {
            // Web3@1.0 provider doesn't support synchronous http requests,
            // so it only has an async `send` method, instead of a `send` and `sendAsync` in web3@0.x.x`
            // We re-assign the send method so that Web3@1.0 providers work with @0xproject/web3-wrapper
            (provider as any).sendAsync = (provider as any).send;
        }
        this.abiDecoder = new AbiDecoder([]);
        this._web3 = new Web3();
        this._web3.setProvider(provider);
        this._txDefaults = txDefaults || {};
        this._jsonRpcRequestId = 0;
    }
    /**
     * Get the contract defaults set to the Web3Wrapper instance
     * @return  TxData defaults (e.g gas, gasPrice, nonce, etc...)
     */
    public getContractDefaults(): Partial<TxData> {
        return this._txDefaults;
    }
    /**
     * Retrieve the Web3 provider
     * @return  Web3 provider instance
     */
    public getProvider(): Provider {
        return this._web3.currentProvider;
    }
    /**
     * Update the used Web3 provider
     * @param provider The new Web3 provider to be set
     */
    public setProvider(provider: Provider): void {
        this._web3.setProvider(provider);
    }
    /**
     * Check whether an address is available through the backing provider. This can be
     * useful if you want to know whether a user can sign messages or transactions from
     * a given Ethereum address.
     * @param senderAddress Address to check availability for
     * @returns Whether the address is available through the provider.
     */
    public async isSenderAddressAvailableAsync(senderAddress: string): Promise<boolean> {
        const addresses = await this.getAvailableAddressesAsync();
        const normalizedAddress = senderAddress.toLowerCase();
        return _.includes(addresses, normalizedAddress);
    }
    /**
     * Fetch the backing Ethereum node's version string (e.g `MetaMask/v4.2.0`)
     * @returns Ethereum node's version string
     */
    public async getNodeVersionAsync(): Promise<string> {
        const nodeVersion = await this._sendRawPayloadAsync<string>({ method: 'web3_clientVersion' });
        return nodeVersion;
    }
    /**
     * Fetches the networkId of the backing Ethereum node
     * @returns The network id
     */
    public async getNetworkIdAsync(): Promise<number> {
        const networkIdStr = await this._sendRawPayloadAsync<string>({ method: 'net_version' });
        const networkId = _.parseInt(networkIdStr);
        return networkId;
    }
    /**
     * Retrieves the transaction receipt for a given transaction hash
     * @param txHash Transaction hash
     * @returns The transaction receipt, including it's status (0: failed, 1: succeeded or undefined: not found)
     */
    public async getTransactionReceiptAsync(txHash: string): Promise<TransactionReceipt> {
        const transactionReceipt = await promisify<TransactionReceipt>(this._web3.eth.getTransactionReceipt)(txHash);
        if (!_.isNull(transactionReceipt)) {
            transactionReceipt.status = this._normalizeTxReceiptStatus(transactionReceipt.status);
        }
        return transactionReceipt;
    }
    /**
     * Retrieves an accounts Ether balance in wei
     * @param owner Account whose balance you wish to check
     * @returns Balance in wei
     */
    public async getBalanceInWeiAsync(owner: string): Promise<BigNumber> {
        let balanceInWei = await promisify<BigNumber>(this._web3.eth.getBalance)(owner);
        // Rewrap in a new BigNumber
        balanceInWei = new BigNumber(balanceInWei);
        return balanceInWei;
    }
    /**
     * Check if a contract exists at a given address
     * @param address Address to which to check
     * @returns Whether or not contract code was found at the supplied address
     */
    public async doesContractExistAtAddressAsync(address: string): Promise<boolean> {
        const code = await promisify<string>(this._web3.eth.getCode)(address);
        // Regex matches 0x0, 0x00, 0x in order to accommodate poorly implemented clients
        const isCodeEmpty = /^0x0{0,40}$/i.test(code);
        return !isCodeEmpty;
    }
    /**
     * Sign a message with a specific address's private key (`eth_sign`)
     * @param address Address of signer
     * @param message Message to sign
     * @returns Signature string (might be VRS or RSV depending on the Signer)
     */
    public async signMessageAsync(address: string, message: string): Promise<string> {
        const signData = await promisify<string>(this._web3.eth.sign)(address, message);
        return signData;
    }
    /**
     * Fetches the latest block number
     * @returns Block number
     */
    public async getBlockNumberAsync(): Promise<number> {
        const blockNumber = await promisify<number>(this._web3.eth.getBlockNumber)();
        return blockNumber;
    }
    /**
     * Fetch a specific Ethereum block
     * @param blockParam The block you wish to fetch (blockHash, blockNumber or blockLiteral)
     * @returns The requested block without transaction data
     */
    public async getBlockAsync(blockParam: string | BlockParam): Promise<BlockWithoutTransactionData> {
        const block = await promisify<BlockWithoutTransactionData>(this._web3.eth.getBlock)(blockParam);
        return block;
    }
    /**
     * Fetch a block's timestamp
     * @param blockParam The block you wish to fetch (blockHash, blockNumber or blockLiteral)
     * @returns The block's timestamp
     */
    public async getBlockTimestampAsync(blockParam: string | BlockParam): Promise<number> {
        const { timestamp } = await this.getBlockAsync(blockParam);
        return timestamp;
    }
    /**
     * Retrieve the user addresses available through the backing provider
     * @returns Available user addresses
     */
    public async getAvailableAddressesAsync(): Promise<string[]> {
        const addresses = await promisify<string[]>(this._web3.eth.getAccounts)();
        const normalizedAddresses = _.map(addresses, address => address.toLowerCase());
        return normalizedAddresses;
    }
    /**
     * Take a snapshot of the blockchain state on a TestRPC/Ganache local node
     * @returns The snapshot id. This can be used to revert to this snapshot
     */
    public async takeSnapshotAsync(): Promise<number> {
        const snapshotId = Number(await this._sendRawPayloadAsync<string>({ method: 'evm_snapshot', params: [] }));
        return snapshotId;
    }
    /**
     * Revert the blockchain state to a previous snapshot state on TestRPC/Ganache local node
     * @param snapshotId snapshot id to revert to
     * @returns Whether the revert was successful
     */
    public async revertSnapshotAsync(snapshotId: number): Promise<boolean> {
        const didRevert = await this._sendRawPayloadAsync<boolean>({ method: 'evm_revert', params: [snapshotId] });
        return didRevert;
    }
    /**
     * Mine a block on a TestRPC/Ganache local node
     */
    public async mineBlockAsync(): Promise<void> {
        await this._sendRawPayloadAsync<string>({ method: 'evm_mine', params: [] });
    }
    /**
     * Increase the next blocks timestamp on TestRPC/Ganache or Geth local node.
     * Will throw if provider is neither TestRPC/Ganache or Geth.
     * @param timeDelta Amount of time to add in seconds
     */
    public async increaseTimeAsync(timeDelta: number): Promise<number> {
        // Detect Geth vs. Ganache and use appropriate endpoint.
        const version = await this.getNodeVersionAsync();
        if (_.includes(version, uniqueVersionIds.geth)) {
            return this._sendRawPayloadAsync<number>({ method: 'debug_increaseTime', params: [timeDelta] });
        } else if (_.includes(version, uniqueVersionIds.ganache)) {
            return this._sendRawPayloadAsync<number>({ method: 'evm_increaseTime', params: [timeDelta] });
        } else {
            throw new Error(`Unknown client version: ${version}`);
        }
    }
    /**
     * Retrieve smart contract logs for a given filter
     * @param filter Parameters by which to filter which logs to retrieve
     * @returns The corresponding log entries
     */
    public async getLogsAsync(filter: FilterObject): Promise<LogEntry[]> {
        let fromBlock = filter.fromBlock;
        if (_.isNumber(fromBlock)) {
            fromBlock = this._web3.toHex(fromBlock);
        }
        let toBlock = filter.toBlock;
        if (_.isNumber(toBlock)) {
            toBlock = this._web3.toHex(toBlock);
        }
        const serializedFilter = {
            ...filter,
            fromBlock,
            toBlock,
        };
        const payload = {
            jsonrpc: '2.0',
            method: 'eth_getLogs',
            params: [serializedFilter],
        };
        const rawLogs = await this._sendRawPayloadAsync<RawLogEntry[]>(payload);
        const formattedLogs = _.map(rawLogs, this._formatLog.bind(this));
        return formattedLogs;
    }
    /**
     * Get a Web3 contract factory instance for a given ABI
     * @param abi Smart contract ABI
     * @returns Web3 contract factory which can create Web3 Contract instances from the supplied ABI
     */
    public getContractFromAbi(abi: ContractAbi): Web3.Contract<any> {
        const web3Contract = this._web3.eth.contract(abi);
        return web3Contract;
    }
    /**
     * Calculate the estimated gas cost for a given transaction
     * @param txData Transaction data
     * @returns Estimated gas cost
     */
    public async estimateGasAsync(txData: Partial<TxData>): Promise<number> {
        const gas = await promisify<number>(this._web3.eth.estimateGas)(txData);
        return gas;
    }
    /**
     * Call a smart contract method at a given block height
     * @param callData Call data
     * @param defaultBlock Block height at which to make the call. Defaults to `latest`
     * @returns The raw call result
     */
    public async callAsync(callData: CallData, defaultBlock?: BlockParam): Promise<string> {
        const rawCallResult = await promisify<string>(this._web3.eth.call)(callData, defaultBlock);
        if (rawCallResult === '0x') {
            throw new Error('Contract call failed (returned null)');
        }
        return rawCallResult;
    }
    /**
     * Send a transaction
     * @param txData Transaction data
     * @returns Transaction hash
     */
    public async sendTransactionAsync(txData: TxData): Promise<string> {
        const txHash = await promisify<string>(this._web3.eth.sendTransaction)(txData);
        return txHash;
    }
    /**
     * Waits for a transaction to be mined and returns the transaction receipt.
     * Note that just because a transaction was mined does not mean it was
     * successful. You need to check the status code of the transaction receipt
     * to find out if it was successful, or use the helper method
     * awaitTransactionSuccessAsync.
     * @param   txHash            Transaction hash
     * @param   pollingIntervalMs How often (in ms) should we check if the transaction is mined.
     * @param   timeoutMs         How long (in ms) to poll for transaction mined until aborting.
     * @return  Transaction receipt with decoded log args.
     */
    public async awaitTransactionMinedAsync(
        txHash: string,
        pollingIntervalMs: number = 1000,
        timeoutMs?: number,
    ): Promise<TransactionReceiptWithDecodedLogs> {
        let wasTimeoutExceeded = false;
        if (timeoutMs) {
            setTimeout(() => (wasTimeoutExceeded = true), timeoutMs);
        }

        const txReceiptPromise = new Promise(
            (resolve: (receipt: TransactionReceiptWithDecodedLogs) => void, reject) => {
                const intervalId = intervalUtils.setAsyncExcludingInterval(
                    async () => {
                        if (wasTimeoutExceeded) {
                            intervalUtils.clearAsyncExcludingInterval(intervalId);
                            return reject(Web3WrapperErrors.TransactionMiningTimeout);
                        }

                        const transactionReceipt = await this.getTransactionReceiptAsync(txHash);
                        if (!_.isNull(transactionReceipt)) {
                            intervalUtils.clearAsyncExcludingInterval(intervalId);
                            const logsWithDecodedArgs = _.map(
                                transactionReceipt.logs,
                                this.abiDecoder.tryToDecodeLogOrNoop.bind(this.abiDecoder),
                            );
                            const transactionReceiptWithDecodedLogArgs: TransactionReceiptWithDecodedLogs = {
                                ...transactionReceipt,
                                logs: logsWithDecodedArgs,
                            };
                            resolve(transactionReceiptWithDecodedLogArgs);
                        }
                    },
                    pollingIntervalMs,
                    (err: Error) => {
                        intervalUtils.clearAsyncExcludingInterval(intervalId);
                        reject(err);
                    },
                );
            },
        );
        const txReceipt = await txReceiptPromise;
        return txReceipt;
    }
    /**
     * Waits for a transaction to be mined and returns the transaction receipt.
     * Unlike awaitTransactionMinedAsync, it will throw if the receipt has a
     * status that is not equal to 1. A status of 0 or null indicates that the
     * transaction was mined, but failed. See:
     * https://github.com/ethereum/wiki/wiki/JavaScript-API#web3ethgettransactionreceipt
     * @param   txHash            Transaction hash
     * @param   pollingIntervalMs How often (in ms) should we check if the transaction is mined.
     * @param   timeoutMs         How long (in ms) to poll for transaction mined until aborting.
     * @return  Transaction receipt with decoded log args.
     */
    public async awaitTransactionSuccessAsync(
        txHash: string,
        pollingIntervalMs: number = 1000,
        timeoutMs?: number,
    ): Promise<TransactionReceiptWithDecodedLogs> {
        const receipt = await this.awaitTransactionMinedAsync(txHash, pollingIntervalMs, timeoutMs);
        if (receipt.status !== 1) {
            throw new Error(`Transaction failed: ${txHash}`);
        }
        return receipt;
    }
    /**
     * Calls the 'debug_setHead' JSON RPC method, which sets the current head of
     * the local chain by block number. Note, this is a destructive action and
     * may severely damage your chain. Use with extreme caution. As of now, this
     * is only supported by Geth. It sill throw if the 'debug_setHead' method is
     * not supported.
     * @param  blockNumber The block number to reset to.
     */
    public async setHeadAsync(blockNumber: number): Promise<void> {
        await this._sendRawPayloadAsync<void>({ method: 'debug_setHead', params: [this._web3.toHex(blockNumber)] });
    }
    private async _sendRawPayloadAsync<A>(payload: Partial<JSONRPCRequestPayload>): Promise<A> {
        const sendAsync = this._web3.currentProvider.sendAsync.bind(this._web3.currentProvider);
        payload.id = this._jsonRpcRequestId++;
        const response = await promisify<JSONRPCResponsePayload>(sendAsync)(payload);
        const result = response.result;
        return result;
    }
    private _normalizeTxReceiptStatus(status: undefined | null | string | 0 | 1): null | 0 | 1 {
        // Transaction status might have four values
        // undefined - Testrpc and other old clients
        // null - New clients on old transactions
        // number - Parity
        // hex - Geth
        if (_.isString(status)) {
            return this._web3.toDecimal(status) as 0 | 1;
        } else if (_.isUndefined(status)) {
            return null;
        } else {
            return status;
        }
    }
    private _formatLog(rawLog: RawLogEntry): LogEntry {
        const formattedLog = {
            ...rawLog,
            logIndex: this._hexToDecimal(rawLog.logIndex),
            blockNumber: this._hexToDecimal(rawLog.blockNumber),
            transactionIndex: this._hexToDecimal(rawLog.transactionIndex),
        };
        return formattedLog;
    }
    private _hexToDecimal(hex: string | null): number | null {
        if (_.isNull(hex)) {
            return null;
        }
        const decimal = this._web3.toDecimal(hex);
        return decimal;
    }
}