/
LendingPool.sol
930 lines (806 loc) · 29.3 KB
/
LendingPool.sol
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
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.6.8;
pragma experimental ABIEncoderV2;
import {SafeMath} from '../dependencies/openzeppelin/contracts/SafeMath.sol';
import {IERC20} from '../dependencies/openzeppelin/contracts/IERC20.sol';
import {VersionedInitializable} from '../libraries/aave-upgradeability/VersionedInitializable.sol';
import {ILendingPoolAddressesProvider} from '../interfaces/ILendingPoolAddressesProvider.sol';
import {IAToken} from '../tokenization/interfaces/IAToken.sol';
import {Helpers} from '../libraries/helpers/Helpers.sol';
import {Errors} from '../libraries/helpers/Errors.sol';
import {WadRayMath} from '../libraries/math/WadRayMath.sol';
import {PercentageMath} from '../libraries/math/PercentageMath.sol';
import {ReserveLogic} from '../libraries/logic/ReserveLogic.sol';
import {GenericLogic} from '../libraries/logic/GenericLogic.sol';
import {ValidationLogic} from '../libraries/logic/ValidationLogic.sol';
import {ReserveConfiguration} from '../libraries/configuration/ReserveConfiguration.sol';
import {UserConfiguration} from '../libraries/configuration/UserConfiguration.sol';
import {IStableDebtToken} from '../tokenization/interfaces/IStableDebtToken.sol';
import {IVariableDebtToken} from '../tokenization/interfaces/IVariableDebtToken.sol';
import {DebtTokenBase} from '../tokenization/base/DebtTokenBase.sol';
import {IFlashLoanReceiver} from '../flashloan/interfaces/IFlashLoanReceiver.sol';
import {ISwapAdapter} from '../interfaces/ISwapAdapter.sol';
import {LendingPoolCollateralManager} from './LendingPoolCollateralManager.sol';
import {IPriceOracleGetter} from '../interfaces/IPriceOracleGetter.sol';
import {SafeERC20} from '../dependencies/openzeppelin/contracts/SafeERC20.sol';
import {ILendingPool} from '../interfaces/ILendingPool.sol';
import {LendingPoolStorage} from './LendingPoolStorage.sol';
import {IReserveInterestRateStrategy} from '../interfaces/IReserveInterestRateStrategy.sol';
/**
* @title LendingPool contract
* @notice Implements the actions of the LendingPool, and exposes accessory methods to fetch the users and reserve data
* @author Aave
**/
contract LendingPool is VersionedInitializable, ILendingPool, LendingPoolStorage {
using SafeMath for uint256;
using WadRayMath for uint256;
using PercentageMath for uint256;
using SafeERC20 for IERC20;
//main configuration parameters
uint256 public constant REBALANCE_UP_LIQUIDITY_RATE_THRESHOLD = 4000;
uint256 public constant REBALANCE_UP_USAGE_RATIO_THRESHOLD = 0.95 * 1e27; //usage ratio of 95%
uint256 public constant MAX_STABLE_RATE_BORROW_SIZE_PERCENT = 2500;
uint256 public constant FLASHLOAN_PREMIUM_TOTAL = 9;
uint256 public constant MAX_NUMBER_RESERVES = 128;
uint256 public constant LENDINGPOOL_REVISION = 0x2;
/**
* @dev only lending pools configurator can use functions affected by this modifier
**/
function _onlyLendingPoolConfigurator() internal view {
require(
_addressesProvider.getLendingPoolConfigurator() == msg.sender,
Errors.CALLER_NOT_LENDING_POOL_CONFIGURATOR
);
}
/**
* @dev Function to make a function callable only when the contract is not paused.
*
* Requirements:
*
* - The contract must not be paused.
*/
function _whenNotPaused() internal view {
require(!_paused, Errors.IS_PAUSED);
}
function getRevision() internal override pure returns (uint256) {
return LENDINGPOOL_REVISION;
}
/**
* @dev this function is invoked by the proxy contract when the LendingPool contract is added to the
* AddressesProvider.
* @param provider the address of the LendingPoolAddressesProvider registry
**/
function initialize(ILendingPoolAddressesProvider provider) public initializer {
_addressesProvider = provider;
}
/**
* @dev deposits The underlying asset into the reserve. A corresponding amount of the overlying asset (aTokens)
* is minted.
* @param asset the address of the reserve
* @param amount the amount to be deposited
* @param referralCode integrators are assigned a referral code and can potentially receive rewards.
**/
function deposit(
address asset,
uint256 amount,
address onBehalfOf,
uint16 referralCode
) external override {
_whenNotPaused();
ReserveLogic.ReserveData storage reserve = _reserves[asset];
ValidationLogic.validateDeposit(reserve, amount);
address aToken = reserve.aTokenAddress;
reserve.updateState();
reserve.updateInterestRates(asset, aToken, amount, 0);
bool isFirstDeposit = IAToken(aToken).mint(onBehalfOf, amount, reserve.liquidityIndex);
if (isFirstDeposit) {
_usersConfig[onBehalfOf].setUsingAsCollateral(reserve.id, true);
}
//transfer to the aToken contract
IERC20(asset).safeTransferFrom(msg.sender, aToken, amount);
emit Deposit(asset, msg.sender, onBehalfOf, amount, referralCode);
}
/**
* @dev withdraws the _reserves of user.
* @param asset the address of the reserve
* @param amount the underlying amount to be redeemed
**/
function withdraw(address asset, uint256 amount) external override {
_whenNotPaused();
ReserveLogic.ReserveData storage reserve = _reserves[asset];
address aToken = reserve.aTokenAddress;
uint256 userBalance = IAToken(aToken).balanceOf(msg.sender);
uint256 amountToWithdraw = amount;
//if amount is equal to uint(-1), the user wants to redeem everything
if (amount == type(uint256).max) {
amountToWithdraw = userBalance;
}
ValidationLogic.validateWithdraw(
asset,
amountToWithdraw,
userBalance,
_reserves,
_usersConfig[msg.sender],
_reservesList,
_reservesCount,
_addressesProvider.getPriceOracle()
);
reserve.updateState();
reserve.updateInterestRates(asset, aToken, 0, amountToWithdraw);
if (amountToWithdraw == userBalance) {
_usersConfig[msg.sender].setUsingAsCollateral(reserve.id, false);
}
IAToken(aToken).burn(msg.sender, msg.sender, amountToWithdraw, reserve.liquidityIndex);
emit Withdraw(asset, msg.sender, amountToWithdraw);
}
/**
* @dev returns the borrow allowance of the user
* @param asset The underlying asset of the debt token
* @param fromUser The user to giving allowance
* @param toUser The user to give allowance to
* @param interestRateMode Type of debt: 1 for stable, 2 for variable
* @return the current allowance of toUser
**/
function getBorrowAllowance(
address fromUser,
address toUser,
address asset,
uint256 interestRateMode
) external override view returns (uint256) {
return
_borrowAllowance[_reserves[asset].getDebtTokenAddress(interestRateMode)][fromUser][toUser];
}
/**
* @dev Sets allowance to borrow on a certain type of debt asset for a certain user address
* @param asset The underlying asset of the debt token
* @param user The user to give allowance to
* @param interestRateMode Type of debt: 1 for stable, 2 for variable
* @param amount Allowance amount to borrow
**/
function delegateBorrowAllowance(
address asset,
address user,
uint256 interestRateMode,
uint256 amount
) external override {
_whenNotPaused();
address debtToken = _reserves[asset].getDebtTokenAddress(interestRateMode);
_borrowAllowance[debtToken][msg.sender][user] = amount;
emit BorrowAllowanceDelegated(asset, msg.sender, user, interestRateMode, amount);
}
/**
* @dev Allows users to borrow a specific amount of the reserve currency, provided that the borrower
* already deposited enough collateral.
* @param asset the address of the reserve
* @param amount the amount to be borrowed
* @param interestRateMode the interest rate mode at which the user wants to borrow. Can be 0 (STABLE) or 1 (VARIABLE)
* @param referralCode a referral code for integrators
* @param onBehalfOf address of the user who will receive the debt
**/
function borrow(
address asset,
uint256 amount,
uint256 interestRateMode,
uint16 referralCode,
address onBehalfOf
) external override {
_whenNotPaused();
ReserveLogic.ReserveData storage reserve = _reserves[asset];
if (onBehalfOf != msg.sender) {
address debtToken = reserve.getDebtTokenAddress(interestRateMode);
_borrowAllowance[debtToken][onBehalfOf][msg
.sender] = _borrowAllowance[debtToken][onBehalfOf][msg.sender].sub(
amount,
Errors.BORROW_ALLOWANCE_ARE_NOT_ENOUGH
);
}
_executeBorrow(
ExecuteBorrowParams(
asset,
msg.sender,
onBehalfOf,
amount,
interestRateMode,
reserve.aTokenAddress,
referralCode,
true
)
);
}
/**
* @notice repays a borrow on the specific reserve, for the specified amount (or for the whole amount, if uint256(-1) is specified).
* @dev the target user is defined by onBehalfOf. If there is no repayment on behalf of another account,
* onBehalfOf must be equal to msg.sender.
* @param asset the address of the reserve on which the user borrowed
* @param amount the amount to repay, or uint256(-1) if the user wants to repay everything
* @param onBehalfOf the address for which msg.sender is repaying.
**/
function repay(
address asset,
uint256 amount,
uint256 rateMode,
address onBehalfOf
) external override {
_whenNotPaused();
ReserveLogic.ReserveData storage reserve = _reserves[asset];
(uint256 stableDebt, uint256 variableDebt) = Helpers.getUserCurrentDebt(onBehalfOf, reserve);
ReserveLogic.InterestRateMode interestRateMode = ReserveLogic.InterestRateMode(rateMode);
ValidationLogic.validateRepay(
reserve,
amount,
interestRateMode,
onBehalfOf,
stableDebt,
variableDebt
);
//default to max amount
uint256 paybackAmount = interestRateMode == ReserveLogic.InterestRateMode.STABLE
? stableDebt
: variableDebt;
if (amount < paybackAmount) {
paybackAmount = amount;
}
reserve.updateState();
//burns an equivalent amount of debt tokens
if (interestRateMode == ReserveLogic.InterestRateMode.STABLE) {
IStableDebtToken(reserve.stableDebtTokenAddress).burn(onBehalfOf, paybackAmount);
} else {
IVariableDebtToken(reserve.variableDebtTokenAddress).burn(
onBehalfOf,
paybackAmount,
reserve.variableBorrowIndex
);
}
address aToken = reserve.aTokenAddress;
reserve.updateInterestRates(asset, aToken, paybackAmount, 0);
if (stableDebt.add(variableDebt).sub(paybackAmount) == 0) {
_usersConfig[onBehalfOf].setBorrowing(reserve.id, false);
}
IERC20(asset).safeTransferFrom(msg.sender, aToken, paybackAmount);
emit Repay(asset, onBehalfOf, msg.sender, paybackAmount);
}
/**
* @dev borrowers can user this function to swap between stable and variable borrow rate modes.
* @param asset the address of the reserve on which the user borrowed
* @param rateMode the rate mode that the user wants to swap
**/
function swapBorrowRateMode(address asset, uint256 rateMode) external override {
_whenNotPaused();
ReserveLogic.ReserveData storage reserve = _reserves[asset];
(uint256 stableDebt, uint256 variableDebt) = Helpers.getUserCurrentDebt(msg.sender, reserve);
ReserveLogic.InterestRateMode interestRateMode = ReserveLogic.InterestRateMode(rateMode);
ValidationLogic.validateSwapRateMode(
reserve,
_usersConfig[msg.sender],
stableDebt,
variableDebt,
interestRateMode
);
reserve.updateState();
if (interestRateMode == ReserveLogic.InterestRateMode.STABLE) {
//burn stable rate tokens, mint variable rate tokens
IStableDebtToken(reserve.stableDebtTokenAddress).burn(msg.sender, stableDebt);
IVariableDebtToken(reserve.variableDebtTokenAddress).mint(
msg.sender,
stableDebt,
reserve.variableBorrowIndex
);
} else {
//do the opposite
IVariableDebtToken(reserve.variableDebtTokenAddress).burn(
msg.sender,
variableDebt,
reserve.variableBorrowIndex
);
IStableDebtToken(reserve.stableDebtTokenAddress).mint(
msg.sender,
variableDebt,
reserve.currentStableBorrowRate
);
}
reserve.updateInterestRates(asset, reserve.aTokenAddress, 0, 0);
emit Swap(asset, msg.sender);
}
/**
* @dev rebalances the stable interest rate of a user. Users can be rebalanced if the following conditions are satisfied:
* 1. Usage ratio is above 95%
* 2. the current deposit APY is below REBALANCE_UP_THRESHOLD * maxVariableBorrowRate, which means that too much has been
* borrowed at a stable rate and depositors are not earning enough.
* @param asset the address of the reserve
* @param user the address of the user to be rebalanced
**/
function rebalanceStableBorrowRate(address asset, address user) external override {
_whenNotPaused();
ReserveLogic.ReserveData storage reserve = _reserves[asset];
IERC20 stableDebtToken = IERC20(reserve.stableDebtTokenAddress);
IERC20 variableDebtToken = IERC20(reserve.variableDebtTokenAddress);
address aTokenAddress = reserve.aTokenAddress;
uint256 stableBorrowBalance = IERC20(stableDebtToken).balanceOf(user);
//if the usage ratio is below 95%, no rebalances are needed
uint256 totalBorrows = stableDebtToken
.totalSupply()
.add(variableDebtToken.totalSupply())
.wadToRay();
uint256 availableLiquidity = IERC20(asset).balanceOf(aTokenAddress).wadToRay();
uint256 usageRatio = totalBorrows == 0
? 0
: totalBorrows.rayDiv(availableLiquidity.add(totalBorrows));
//if the liquidity rate is below REBALANCE_UP_THRESHOLD of the max variable APR at 95% usage,
//then we allow rebalancing of the stable rate positions.
uint256 currentLiquidityRate = reserve.currentLiquidityRate;
uint256 maxVariableBorrowRate = IReserveInterestRateStrategy(
reserve
.interestRateStrategyAddress
)
.getMaxVariableBorrowRate();
require(
usageRatio >= REBALANCE_UP_USAGE_RATIO_THRESHOLD &&
currentLiquidityRate <=
maxVariableBorrowRate.percentMul(REBALANCE_UP_LIQUIDITY_RATE_THRESHOLD),
Errors.INTEREST_RATE_REBALANCE_CONDITIONS_NOT_MET
);
reserve.updateState();
IStableDebtToken(address(stableDebtToken)).burn(user, stableBorrowBalance);
IStableDebtToken(address(stableDebtToken)).mint(
user,
stableBorrowBalance,
reserve.currentStableBorrowRate
);
reserve.updateInterestRates(asset, aTokenAddress, 0, 0);
emit RebalanceStableBorrowRate(asset, user);
}
/**
* @dev allows depositors to enable or disable a specific deposit as collateral.
* @param asset the address of the reserve
* @param useAsCollateral true if the user wants to use the deposit as collateral, false otherwise.
**/
function setUserUseReserveAsCollateral(address asset, bool useAsCollateral) external override {
_whenNotPaused();
ReserveLogic.ReserveData storage reserve = _reserves[asset];
ValidationLogic.validateSetUseReserveAsCollateral(
reserve,
asset,
_reserves,
_usersConfig[msg.sender],
_reservesList,
_reservesCount,
_addressesProvider.getPriceOracle()
);
_usersConfig[msg.sender].setUsingAsCollateral(reserve.id, useAsCollateral);
if (useAsCollateral) {
emit ReserveUsedAsCollateralEnabled(asset, msg.sender);
} else {
emit ReserveUsedAsCollateralDisabled(asset, msg.sender);
}
}
/**
* @dev users can invoke this function to liquidate an undercollateralized position.
* @param asset the address of the collateral to liquidated
* @param asset the address of the principal reserve
* @param user the address of the borrower
* @param purchaseAmount the amount of principal that the liquidator wants to repay
* @param receiveAToken true if the liquidators wants to receive the aTokens, false if
* he wants to receive the underlying asset directly
**/
function liquidationCall(
address collateral,
address asset,
address user,
uint256 purchaseAmount,
bool receiveAToken
) external override {
_whenNotPaused();
address collateralManager = _addressesProvider.getLendingPoolCollateralManager();
//solium-disable-next-line
(bool success, bytes memory result) = collateralManager.delegatecall(
abi.encodeWithSignature(
'liquidationCall(address,address,address,uint256,bool)',
collateral,
asset,
user,
purchaseAmount,
receiveAToken
)
);
require(success, Errors.LIQUIDATION_CALL_FAILED);
(uint256 returnCode, string memory returnMessage) = abi.decode(result, (uint256, string));
if (returnCode != 0) {
//error found
revert(string(abi.encodePacked(returnMessage)));
}
}
struct FlashLoanLocalVars {
IFlashLoanReceiver receiver;
address oracle;
ReserveLogic.InterestRateMode debtMode;
uint256 i;
address currentAsset;
address currentATokenAddress;
uint256 currentAmount;
uint256 currentPremium;
uint256 currentAmountPlusPremium;
}
/**
* @dev allows smartcontracts to access the liquidity of the pool within one transaction,
* as long as the amount taken plus a fee is returned. NOTE There are security concerns for developers of flashloan receiver contracts
* that must be kept into consideration. For further details please visit https://developers.aave.com
* @param receiverAddress The address of the contract receiving the funds. The receiver should implement the IFlashLoanReceiver interface.
* @param assets The addresss of the assets being flashborrowed
* @param amounts The amounts requested for this flashloan for each asset
* @param mode Type of the debt to open if the flash loan is not returned. 0 -> Don't open any debt, just revert, 1 -> stable, 2 -> variable
* @param params Variadic packed params to pass to the receiver as extra information
* @param referralCode Referral code of the flash loan
**/
function flashLoan(
address receiverAddress,
address[] calldata assets,
uint256[] calldata amounts,
uint256 mode,
bytes calldata params,
uint16 referralCode
) external override {
_whenNotPaused();
FlashLoanLocalVars memory vars;
ValidationLogic.validateFlashloan(assets, amounts, mode);
address[] memory aTokenAddresses = new address[](assets.length);
uint256[] memory premiums = new uint256[](assets.length);
vars.receiver = IFlashLoanReceiver(receiverAddress);
vars.debtMode = ReserveLogic.InterestRateMode(mode);
for (vars.i = 0; vars.i < assets.length; vars.i++) {
aTokenAddresses[vars.i] = _reserves[assets[vars.i]].aTokenAddress;
premiums[vars.i] = amounts[vars.i].mul(FLASHLOAN_PREMIUM_TOTAL).div(10000);
//transfer funds to the receiver
IAToken(aTokenAddresses[vars.i]).transferUnderlyingTo(receiverAddress, amounts[vars.i]);
}
//execute action of the receiver
require(
vars.receiver.executeOperation(assets, amounts, premiums, params),
Errors.INVALID_FLASH_LOAN_EXECUTOR_RETURN
);
for (vars.i = 0; vars.i < assets.length; vars.i++) {
vars.currentAsset = assets[vars.i];
vars.currentAmount = amounts[vars.i];
vars.currentPremium = premiums[vars.i];
vars.currentATokenAddress = aTokenAddresses[vars.i];
vars.currentAmountPlusPremium = vars.currentAmount.add(vars.currentPremium);
if (vars.debtMode == ReserveLogic.InterestRateMode.NONE) {
_reserves[vars.currentAsset].updateState();
_reserves[vars.currentAsset].cumulateToLiquidityIndex(
IERC20(vars.currentATokenAddress).totalSupply(),
vars.currentPremium
);
_reserves[vars.currentAsset].updateInterestRates(
vars.currentAsset,
vars.currentATokenAddress,
vars.currentPremium,
0
);
IERC20(vars.currentAsset).safeTransferFrom(
receiverAddress,
vars.currentATokenAddress,
vars.currentAmountPlusPremium
);
} else {
//if the user didn't choose to return the funds, the system checks if there
//is enough collateral and eventually open a position
_executeBorrow(
ExecuteBorrowParams(
vars.currentAsset,
msg.sender,
msg.sender,
vars.currentAmount,
mode,
vars.currentATokenAddress,
referralCode,
false
)
);
}
emit FlashLoan(receiverAddress, mode, assets, amounts, premiums, referralCode);
}
}
/**
* @dev returns the state and configuration of the reserve
* @param asset the address of the reserve
* @return the state of the reserve
**/
function getReserveData(address asset)
external
override
view
returns (ReserveLogic.ReserveData memory)
{
return _reserves[asset];
}
/**
* @dev returns the user account data across all the reserves
* @param user the address of the user
* @return totalCollateralETH the total collateral in ETH of the user
* @return totalDebtETH the total debt in ETH of the user
* @return availableBorrowsETH the borrowing power left of the user
* @return currentLiquidationThreshold the liquidation threshold of the user
* @return ltv the loan to value of the user
* @return healthFactor the current health factor of the user
**/
function getUserAccountData(address user)
external
override
view
returns (
uint256 totalCollateralETH,
uint256 totalDebtETH,
uint256 availableBorrowsETH,
uint256 currentLiquidationThreshold,
uint256 ltv,
uint256 healthFactor
)
{
(
totalCollateralETH,
totalDebtETH,
ltv,
currentLiquidationThreshold,
healthFactor
) = GenericLogic.calculateUserAccountData(
user,
_reserves,
_usersConfig[user],
_reservesList,
_reservesCount,
_addressesProvider.getPriceOracle()
);
availableBorrowsETH = GenericLogic.calculateAvailableBorrowsETH(
totalCollateralETH,
totalDebtETH,
ltv
);
}
/**
* @dev returns the configuration of the reserve
* @param asset the address of the reserve
* @return the configuration of the reserve
**/
function getConfiguration(address asset)
external
override
view
returns (ReserveConfiguration.Map memory)
{
return _reserves[asset].configuration;
}
/**
* @dev returns the configuration of the user across all the reserves
* @param user the user
* @return the configuration of the user
**/
function getUserConfiguration(address user)
external
override
view
returns (UserConfiguration.Map memory)
{
return _usersConfig[user];
}
/**
* @dev returns the normalized income per unit of asset
* @param asset the address of the reserve
* @return the reserve normalized income
*/
function getReserveNormalizedIncome(address asset) external override view returns (uint256) {
return _reserves[asset].getNormalizedIncome();
}
/**
* @dev returns the normalized variable debt per unit of asset
* @param asset the address of the reserve
* @return the reserve normalized debt
*/
function getReserveNormalizedVariableDebt(address asset)
external
override
view
returns (uint256)
{
return _reserves[asset].getNormalizedDebt();
}
/**
* @dev Returns if the LendingPool is paused
*/
function paused() external override view returns (bool) {
return _paused;
}
/**
* @dev returns the list of the initialized reserves
**/
function getReservesList() external override view returns (address[] memory) {
address[] memory _activeReserves = new address[](_reservesCount);
for (uint256 i = 0; i < _reservesCount; i++) {
_activeReserves[i] = _reservesList[i];
}
return _activeReserves;
}
/**
* @dev returns the addresses provider
**/
function getAddressesProvider() external view returns (ILendingPoolAddressesProvider) {
return _addressesProvider;
}
/**
* @dev validate if a balance decrease for an asset is allowed
* @param asset the address of the reserve
* @param user the user related to the balance decrease
* @param amount the amount being transferred/redeemed
* @return true if the balance decrease can be allowed, false otherwise
*/
function balanceDecreaseAllowed(
address asset,
address user,
uint256 amount
) external override view returns (bool) {
_whenNotPaused();
return
GenericLogic.balanceDecreaseAllowed(
asset,
user,
amount,
_reserves,
_usersConfig[user],
_reservesList,
_reservesCount,
_addressesProvider.getPriceOracle()
);
}
/**
* @dev avoids direct transfers of ETH
**/
receive() external payable {
revert();
}
/**
* @dev initializes a reserve
* @param asset the address of the reserve
* @param aTokenAddress the address of the overlying aToken contract
* @param interestRateStrategyAddress the address of the interest rate strategy contract
**/
function initReserve(
address asset,
address aTokenAddress,
address stableDebtAddress,
address variableDebtAddress,
address interestRateStrategyAddress
) external override {
_onlyLendingPoolConfigurator();
_reserves[asset].init(
aTokenAddress,
stableDebtAddress,
variableDebtAddress,
interestRateStrategyAddress
);
_addReserveToList(asset);
}
/**
* @dev updates the address of the interest rate strategy contract
* @param asset the address of the reserve
* @param rateStrategyAddress the address of the interest rate strategy contract
**/
function setReserveInterestRateStrategyAddress(address asset, address rateStrategyAddress)
external
override
{
_onlyLendingPoolConfigurator();
_reserves[asset].interestRateStrategyAddress = rateStrategyAddress;
}
/**
* @dev sets the configuration map of the reserve
* @param asset the address of the reserve
* @param configuration the configuration map
**/
function setConfiguration(address asset, uint256 configuration) external override {
_onlyLendingPoolConfigurator();
_reserves[asset].configuration.data = configuration;
}
/**
* @dev Set the _pause state
* @param val the boolean value to set the current pause state of LendingPool
*/
function setPause(bool val) external override {
_onlyLendingPoolConfigurator();
_paused = val;
if (_paused) {
emit Paused();
} else {
emit Unpaused();
}
}
// internal functions
struct ExecuteBorrowParams {
address asset;
address user;
address onBehalfOf;
uint256 amount;
uint256 interestRateMode;
address aTokenAddress;
uint16 referralCode;
bool releaseUnderlying;
}
/**
* @dev Internal function to execute a borrowing action, allowing to transfer or not the underlying
* @param vars Input struct for the borrowing action, in order to avoid STD errors
**/
function _executeBorrow(ExecuteBorrowParams memory vars) internal {
ReserveLogic.ReserveData storage reserve = _reserves[vars.asset];
UserConfiguration.Map storage userConfig = _usersConfig[vars.onBehalfOf];
address oracle = _addressesProvider.getPriceOracle();
uint256 amountInETH = IPriceOracleGetter(oracle).getAssetPrice(vars.asset).mul(vars.amount).div(
10**reserve.configuration.getDecimals()
);
ValidationLogic.validateBorrow(
reserve,
vars.onBehalfOf,
vars.amount,
amountInETH,
vars.interestRateMode,
MAX_STABLE_RATE_BORROW_SIZE_PERCENT,
_reserves,
userConfig,
_reservesList,
_reservesCount,
oracle
);
uint256 reserveId = reserve.id;
if (!userConfig.isBorrowing(reserveId)) {
userConfig.setBorrowing(reserveId, true);
}
reserve.updateState();
//caching the current stable borrow rate
uint256 currentStableRate = 0;
if (
ReserveLogic.InterestRateMode(vars.interestRateMode) == ReserveLogic.InterestRateMode.STABLE
) {
currentStableRate = reserve.currentStableBorrowRate;
IStableDebtToken(reserve.stableDebtTokenAddress).mint(
vars.onBehalfOf,
vars.amount,
currentStableRate
);
} else {
IVariableDebtToken(reserve.variableDebtTokenAddress).mint(
vars.onBehalfOf,
vars.amount,
reserve.variableBorrowIndex
);
}
reserve.updateInterestRates(
vars.asset,
vars.aTokenAddress,
0,
vars.releaseUnderlying ? vars.amount : 0
);
if (vars.releaseUnderlying) {
IAToken(vars.aTokenAddress).transferUnderlyingTo(vars.user, vars.amount);
}
emit Borrow(
vars.asset,
vars.user,
vars.onBehalfOf,
vars.amount,
vars.interestRateMode,
ReserveLogic.InterestRateMode(vars.interestRateMode) == ReserveLogic.InterestRateMode.STABLE
? currentStableRate
: reserve.currentVariableBorrowRate,
vars.referralCode
);
}
/**
* @dev adds a reserve to the array of the _reserves address
**/
function _addReserveToList(address asset) internal {
uint256 reservesCount = _reservesCount;
require(reservesCount < MAX_NUMBER_RESERVES, Errors.NO_MORE_RESERVES_ALLOWED);
bool reserveAlreadyAdded = _reserves[asset].id != 0 || _reservesList[0] == asset;
if (!reserveAlreadyAdded) {
_reserves[asset].id = uint8(reservesCount);
_reservesList[reservesCount] = asset;
_reservesCount++;
}
}
}