impl earning predeploy contract

contracts/docs/earning/Earning.md

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+# Earning
+
+*Acala Developers*
+
+> Earning Predeploy Contract
+
+You can use this predeploy contract to call earning pallet
+
+*This contracts will interact with earning pallet*
+
+## Methods
+
+### bond
+
+```solidity
+function bond(uint256 bondAmount) external nonpayable returns (bool)
+```
+
+Bond.
+
+*It'll emit an {Bonded} event.*
+
+#### Parameters
+
+| Name | Type | Description |
+|---|---|---|
+| bondAmount | uint256 | The amount of native currency used to bond. |
+
+#### Returns
+
+| Name | Type | Description |
+|---|---|---|
+| _0 | bool | Returns a boolean value indicating whether the operation succeeded. |
+
+### getBondingLedger
+
+```solidity
+function getBondingLedger(address who) external view returns (struct IEarning.BondingLedger)
+```
+
+Get bonding ledger of `who`.
+
+
+
+#### Parameters
+
+| Name | Type | Description |
+|---|---|---|
+| who | address | undefined |
+
+#### Returns
+
+| Name | Type | Description |
+|---|---|---|
+| _0 | IEarning.BondingLedger | returns (BondingLedger). |
+
+### getInstantUnstakeFee
+
+```solidity
+function getInstantUnstakeFee() external view returns (uint256, uint256)
+```
+
+Get instant unstake fee ratio.
+
+
+
+
+#### Returns
+
+| Name | Type | Description |
+|---|---|---|
+| _0 | uint256 | returns (percent, accuracy), the ratio is percent/accuracy |
+| _1 | uint256 | undefined |
+
+### getMaxUnbondingChunks
+
+```solidity
+function getMaxUnbondingChunks() external view returns (uint256)
+```
+
+Get the maximum unlocking chunk amount.
+
+
+
+
+#### Returns
+
+| Name | Type | Description |
+|---|---|---|
+| _0 | uint256 | returns (maximum_chunks). |
+
+### getMinBond
+
+```solidity
+function getMinBond() external view returns (uint256)
+```
+
+Get the minimum bond amount.
+
+
+
+
+#### Returns
+
+| Name | Type | Description |
+|---|---|---|
+| _0 | uint256 | returns (min_bond). |
+
+### getUnbondingPeriod
+
+```solidity
+function getUnbondingPeriod() external view returns (uint256)
+```
+
+Get unlocking block.
+
+
+
+
+#### Returns
+
+| Name | Type | Description |
+|---|---|---|
+| _0 | uint256 | returns (unlock_block_number). |
+
+### rebond
+
+```solidity
+function rebond(uint256 rebondAmount) external nonpayable returns (bool)
+```
+
+Rebond.
+
+*It'll emit an {Bonded} event.*
+
+#### Parameters
+
+| Name | Type | Description |
+|---|---|---|
+| rebondAmount | uint256 | The amount of native currency used to rebond. |
+
+#### Returns
+
+| Name | Type | Description |
+|---|---|---|
+| _0 | bool | Returns a boolean value indicating whether the operation succeeded. |
+
+### unbond
+
+```solidity
+function unbond(uint256 unbondAmount) external nonpayable returns (bool)
+```
+
+Unbond.
+
+*It'll emit an {Unbonded} event.*
+
+#### Parameters
+
+| Name | Type | Description |
+|---|---|---|
+| unbondAmount | uint256 | The amount of native currency used to unbond. |
+
+#### Returns
+
+| Name | Type | Description |
+|---|---|---|
+| _0 | bool | Returns a boolean value indicating whether the operation succeeded. |
+
+### unbondInstant
+
+```solidity
+function unbondInstant(uint256 unbondAmount) external nonpayable returns (bool)
+```
+
+Unbond instant.
+
+*It'll emit an {Unbonded} event.*
+
+#### Parameters
+
+| Name | Type | Description |
+|---|---|---|
+| unbondAmount | uint256 | The amount of native currency used to unbond instant. |
+
+#### Returns
+
+| Name | Type | Description |
+|---|---|---|
+| _0 | bool | Returns a boolean value indicating whether the operation succeeded. |
+
+### withdrawUnbonded
+
+```solidity
+function withdrawUnbonded() external nonpayable returns (bool)
+```
+
+Withdraw unbonded.
+
+*It'll emit an {Withdrawn} event.*
+
+
+#### Returns
+
+| Name | Type | Description |
+|---|---|---|
+| _0 | bool | Returns a boolean value indicating whether the operation succeeded. |
+
+
+
+## Events
+
+### Bonded
+
+```solidity
+event Bonded(address indexed sender, uint256 amount)
+```
+
+Bonded event.
+
+
+
+#### Parameters
+
+| Name | Type | Description |
+|---|---|---|
+| sender `indexed` | address | The sender of the transaction. |
+| amount  | uint256 | The bond amount. |
+
+### Unbonded
+
+```solidity
+event Unbonded(address indexed sender, uint256 amount)
+```
+
+Unbonded event.
+
+
+
+#### Parameters
+
+| Name | Type | Description |
+|---|---|---|
+| sender `indexed` | address | The sender of the transaction. |
+| amount  | uint256 | The unbond amount. |
+
+### Withdrawn
+
+```solidity
+event Withdrawn(address indexed sender, uint256 amount)
+```
+
+Withdraw unbonded.
+
+
+
+#### Parameters
+
+| Name | Type | Description |
+|---|---|---|
+| sender `indexed` | address | The sender of the transaction. |
+| amount  | uint256 | The withdrawn unbonded amount. |
+
+
+