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68 lines
2.2 KiB
Markdown
68 lines
2.2 KiB
Markdown
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# State
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For detail on the state tracked by the cdp module see the types package. In particular [keys.go](../types/keys.go) describes how state is stored in the key-value store.
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## Module Accounts
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The cdp module account controls two module accounts:
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**CDP Account:** Stores the deposited cdp collateral, and the debt coins for the debt in all the cdps.
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**Liquidator Account:** Stores debt coins that have been seized by the system, and any stable asset that has been raised through auctions.
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## CDP
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A CDP is a struct representing a debt position owned by one address. It has one collateral type and records the debt that has been drawn and how much fees should be repaid.
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Only an owner is authorized to draw or repay debt, but anyone can deposit collateral to a CDP. Deposits are scoped per address and are recorded separately in `Deposit` types. Depositors are free to withdraw their collateral provided it does not put the CDP below the liquidation ratio.
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The CDP's collateral always equal to the total of the deposits.
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```go
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type CDP struct {
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ID uint64
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Owner sdk.AccAddress
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Collateral sdk.Coins
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Principal sdk.Coins
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AccumulatedFees sdk.Coins
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FeesUpdated time.Time
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}
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```
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CDPs are stored with a couple of database indexes for faster lookup:
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- by collateral ratio - to look up cdps that are close to the liquidation ratio
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- by owner index - to look up cdps that an address is the owner of
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## Deposit
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A Deposit is a struct recording collateral added to a CDP by one address. The address only has authorization to change their deposited amount (provided it does not put the CDP below the liquidation ratio).
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```go
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type Deposit struct {
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CdpID uint64
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Depositor sdk.AccAddress
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Amount sdk.Coins
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}
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```
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## Params
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Module parameters controlled by governance. See [Parameters](06_params.md) for details.
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## NextCDPID
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A global counter used to create unique CDP ids.
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## DebtDenom
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The name of the internal debt coin. Its value can be configured at genesis.
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## Total Principle
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Sum of all non seized debt plus accumulated fees. This is used to calculate the new debt created every block due to the fee interest rate.
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## Previous Block Time
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A record of the last block time used to calculate fees.
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