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
|
import * as _ from 'lodash';
import {Web3Wrapper} from '../web3_wrapper';
import {
ECSignature,
ExchangeContract,
ExchangeContractErrCodes,
ExchangeContractErrs,
FillOrderValidationErrs,
OrderValues,
OrderAddresses,
SignedOrder,
ContractEvent,
} from '../types';
import {assert} from '../utils/assert';
import {ContractWrapper} from './contract_wrapper';
import * as ExchangeArtifacts from '../artifacts/Exchange.json';
import {ecSignatureSchema} from '../schemas/ec_signature_schema';
import {signedOrderSchema} from '../schemas/order_schemas';
import {SchemaValidator} from '../utils/schema_validator';
import {ContractResponse} from '../types';
import {constants} from '../utils/constants';
export class ExchangeWrapper extends ContractWrapper {
private exchangeContractErrCodesToMsg = {
[ExchangeContractErrCodes.ERROR_FILL_EXPIRED]: ExchangeContractErrs.ORDER_EXPIRED,
[ExchangeContractErrCodes.ERROR_CANCEL_EXPIRED]: ExchangeContractErrs.ORDER_EXPIRED,
[ExchangeContractErrCodes.ERROR_FILL_NO_VALUE]: ExchangeContractErrs.ORDER_REMAINING_FILL_AMOUNT_ZERO,
[ExchangeContractErrCodes.ERROR_CANCEL_NO_VALUE]: ExchangeContractErrs.ORDER_REMAINING_FILL_AMOUNT_ZERO,
[ExchangeContractErrCodes.ERROR_FILL_TRUNCATION]: ExchangeContractErrs.ORDER_ROUNDING_ERROR,
[ExchangeContractErrCodes.ERROR_FILL_BALANCE_ALLOWANCE]: ExchangeContractErrs.ORDER_BALANCE_ALLOWANCE_ERROR,
};
private exchangeContractIfExists?: ExchangeContract;
constructor(web3Wrapper: Web3Wrapper) {
super(web3Wrapper);
}
public invalidateContractInstance(): void {
delete this.exchangeContractIfExists;
}
public async isValidSignatureAsync(dataHex: string, ecSignature: ECSignature,
signerAddressHex: string): Promise<boolean> {
assert.isHexString('dataHex', dataHex);
assert.doesConformToSchema('ecSignature', ecSignature, ecSignatureSchema);
assert.isETHAddressHex('signerAddressHex', signerAddressHex);
const senderAddress = await this.web3Wrapper.getSenderAddressOrThrowAsync();
const exchangeInstance = await this.getExchangeContractAsync();
const isValidSignature = await exchangeInstance.isValidSignature.call(
signerAddressHex,
dataHex,
ecSignature.v,
ecSignature.r,
ecSignature.s,
{
from: senderAddress,
},
);
return isValidSignature;
}
/**
* Fills a signed order with a specified amount in baseUnits of the taker token. The caller can
* decide whether they want the call to throw if the balance/allowance checks fail by setting
* shouldCheckTransfer to false. If true, the call will fail without throwing, preserving gas costs.
*/
public async fillOrderAsync(signedOrder: SignedOrder, fillTakerAmountInBaseUnits: BigNumber.BigNumber,
shouldCheckTransfer: boolean): Promise<void> {
assert.doesConformToSchema('signedOrder',
SchemaValidator.convertToJSONSchemaCompatibleObject(signedOrder as object),
signedOrderSchema);
assert.isBigNumber('fillTakerAmountInBaseUnits', fillTakerAmountInBaseUnits);
assert.isBoolean('shouldCheckTransfer', shouldCheckTransfer);
const senderAddress = await this.web3Wrapper.getSenderAddressOrThrowAsync();
const exchangeInstance = await this.getExchangeInstanceOrThrowAsync();
this.validateFillOrder(signedOrder, fillTakerAmountInBaseUnits, senderAddress, shouldCheckTransfer);
const orderAddresses: OrderAddresses = [
signedOrder.maker,
signedOrder.taker,
signedOrder.makerTokenAddress,
signedOrder.takerTokenAddress,
signedOrder.feeRecipient,
];
const orderValues: OrderValues = [
signedOrder.makerTokenAmount,
signedOrder.takerTokenAmount,
signedOrder.makerFee,
signedOrder.takerFee,
signedOrder.expirationUnixTimestampSec,
signedOrder.salt,
];
const gas = await exchangeInstance.fill.estimateGas(
orderAddresses,
orderValues,
fillTakerAmountInBaseUnits,
shouldCheckTransfer,
signedOrder.ecSignature.v,
signedOrder.ecSignature.r,
signedOrder.ecSignature.s,
{
from: senderAddress,
},
);
const response: ContractResponse = await exchangeInstance.fill(
orderAddresses,
orderValues,
fillTakerAmountInBaseUnits,
shouldCheckTransfer,
signedOrder.ecSignature.v,
signedOrder.ecSignature.r,
signedOrder.ecSignature.s,
{
from: senderAddress,
gas,
},
);
this.throwErrorLogsAsErrors(response.logs);
}
private validateFillOrder(signedOrder: SignedOrder, fillAmount: BigNumber.BigNumber, senderAddress: string,
shouldCheckTransfer: boolean = true) {
if (fillAmount.eq(0)) {
throw new Error(FillOrderValidationErrs.FILL_AMOUNT_IS_ZERO);
}
if (signedOrder.taker !== constants.NULL_ADDRESS && signedOrder.taker !== senderAddress) {
throw new Error(FillOrderValidationErrs.NOT_A_TAKER);
}
if (signedOrder.expirationUnixTimestampSec.lessThan(Date.now() / 1000)) {
throw new Error(FillOrderValidationErrs.EXPIRED);
}
}
private async getExchangeInstanceOrThrowAsync(): Promise<ExchangeContract> {
const contractInstance = await this.instantiateContractIfExistsAsync((ExchangeArtifacts as any));
return contractInstance as ExchangeContract;
}
private throwErrorLogsAsErrors(logs: ContractEvent[]): void {
const errEvent = _.find(logs, {event: 'LogError'});
if (!_.isUndefined(errEvent)) {
const errCode = errEvent.args.errorId.toNumber();
const errMessage = this.exchangeContractErrCodesToMsg[errCode];
throw new Error(errMessage);
}
}
private async getExchangeContractAsync(): Promise<ExchangeContract> {
if (!_.isUndefined(this.exchangeContractIfExists)) {
return this.exchangeContractIfExists;
}
const contractInstance = await this.instantiateContractIfExistsAsync((ExchangeArtifacts as any));
this.exchangeContractIfExists = contractInstance as ExchangeContract;
return this.exchangeContractIfExists;
}
}
|
