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| # Exchange State | ||
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| The Exchange module manages several things in state. | ||
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| Big-endian ordering is used for all conversions between numbers and byte arrays. | ||
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| --- | ||
| <!-- TOC --> | ||
| - [Params](#params) | ||
| - [Default Split](#default-split) | ||
| - [Specific Denom Split](#specific-denom-split) | ||
| - [Markets](#markets) | ||
| - [Market Create-Ask Flat Fee](#market-create-ask-flat-fee) | ||
| - [Market Create-Bid Flat Fee](#market-create-bid-flat-fee) | ||
| - [Market Seller Settlement Flat Fee](#market-seller-settlement-flat-fee) | ||
| - [Market Seller Settlement Ratio Fee](#market-seller-settlement-ratio-fee) | ||
| - [Market Buyer Settlement Flat Fee](#market-buyer-settlement-flat-fee) | ||
| - [Market Buyer Settlement Ratio Fee](#market-buyer-settlement-ratio-fee) | ||
| - [Market Inactive Indicator](#market-inactive-indicator) | ||
| - [Market User-Settle Indicator](#market-user-settle-indicator) | ||
| - [Market Permissions](#market-permissions) | ||
| - [Market Create-Ask Required Attributes](#market-create-ask-required-attributes) | ||
| - [Market Create-Bid Required Attributes](#market-create-bid-required-attributes) | ||
| - [Market Account](#market-account) | ||
| - [Market Details](#market-details) | ||
| - [Known Market ID](#known-market-id) | ||
| - [Last Market ID](#last-market-id) | ||
| - [Orders](#orders) | ||
| - [Ask Orders](#ask-orders) | ||
| - [Bid Orders](#bid-orders) | ||
| - [Last Order ID](#last-order-id) | ||
| - [Indexes](#indexes) | ||
| - [Market to Order](#market-to-order) | ||
| - [Owner Address to Order](#owner-address-to-order) | ||
| - [Asset Denom to Order](#asset-denom-to-order) | ||
| - [Market External ID to Order](#market-external-id-to-order) | ||
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| ## Params | ||
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| All params entries start with the type byte `0x00` followed by a string identifying the entry type. | ||
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| Each `<split>` is stored as a `uint16` (2 bytes) in big-endian order. | ||
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| The byte `0x1E` is used in a few places as a record separator. | ||
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| See also: [Params](06_params.md#params). | ||
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| ### Default Split | ||
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| The default split defines the split amount (in basis points) the exchange receives of fees when there is not an applicable specific denom split. | ||
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| * Key:`0x00 | "split" (5 bytes)` | ||
| * Value: `<split (2 bytes)>` | ||
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| ### Specific Denom Split | ||
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| A specific denom split is a split amount (in basis points) the exchange receives of fees for fees paid in a specific denom. | ||
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| * Key: `0x00 | "split" (5 bytes) | <denom (string)>` | ||
| * Value: `<split (2 bytes)>` | ||
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| See also: [DenomSplit](06_params.md#denomsplit). | ||
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| ## Markets | ||
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| Each aspect of a market is stored separately for specific lookup. | ||
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| Each `<market id>` is a `uint32` (4 bytes) in big-endian order. | ||
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| Most aspects of a market have keys that start with the type byte `0x01`, followed by the `<market id>` then another type byte. | ||
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| See also: [Market](03_messages.md#market). | ||
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| ### Market Create-Ask Flat Fee | ||
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| One entry per configured denom. | ||
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| * Key: `0x01 | <market id (4 bytes)> | 0x00 | <denom (string)>` | ||
| * Value: `<amount (string)>` | ||
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| ### Market Create-Bid Flat Fee | ||
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| One entry per configured denom. | ||
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| * Key: `0x01 | <market id (4 bytes)> | 0x01 | <denom (string)>` | ||
| * Value: `<amount (string)>` | ||
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| ### Market Seller Settlement Flat Fee | ||
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| One entry per configured denom. | ||
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| * Key: `0x01 | <market id (4 bytes)> | 0x02 | <denom (string)>` | ||
| * Value: `<amount (string)>` | ||
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| ### Market Seller Settlement Ratio Fee | ||
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| One entry per configured price:fee denom pair. | ||
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| * Key: `0x01 | <market id (4 bytes)> | 0x03 | <price denom (string)> | 0x1E | <fee denom (string)>` | ||
| * Value: `<price amount (string)> | 0x1E | <fee amount (string)>` | ||
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| See also: [FeeRatio](03_messages.md#feeratio). | ||
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| ### Market Buyer Settlement Flat Fee | ||
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| One entry per configured denom. | ||
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| * Key: `0x01 | <market id (4 bytes)> | 0x04 | <denom (string)>` | ||
| * Value: `<amount (string)>` | ||
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| ### Market Buyer Settlement Ratio Fee | ||
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| One entry per configured price:fee denom pair. | ||
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| * Key: `0x01 | <market id (4 bytes)> | 0x05 | <price denom (string)> | 0x1E | <fee denom (string)>` | ||
| * Value: `<price amount (string)> | 0x1E | <fee amount (string)>` | ||
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| See also: [FeeRatio](03_messages.md#feeratio). | ||
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| ### Market Inactive Indicator | ||
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| When a market has `accepting_orders = false`, this state entry will exist. | ||
| When it has `accepting_orders = true`, this entry will not exist. | ||
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| * Key: `0x01 | <market id (4 bytes)> | 0x06` | ||
| * Value: `<nil (0 bytes)>` | ||
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| ### Market User-Settle Indicator | ||
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| When a market has `allow_user_settlement = true`, this state entry will exist. | ||
| When it has `allow_user_settlement = false`, this entry will not exist. | ||
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| * Key: `0x01 | <market id (4 bytes)> | 0x07` | ||
| * Value: `<nil (0 bytes)>` | ||
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| ### Market Permissions | ||
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| When an address has a given permission in a market, the following entry will exist. | ||
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| * Key: `0x01 | <market id (4 bytes)> | 0x08 | <addr len (1 byte)> | <addr> | <permission type byte (1 byte)>` | ||
| * Value: `<nil (0 bytes)>` | ||
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| The `<permission type byte>` is a single byte as `uint8` with the same values as the enum entries, e.g. `PERMISSION_CANCEL` is `0x03`. | ||
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| See also: [AccessGrant](03_messages.md#accessgrant) and [Permission](03_messages.md#permission). | ||
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| ### Market Create-Ask Required Attributes | ||
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| * Key: `0x01 | <market id (4 bytes)> | 0x09 | 0x00` | ||
| * Value: `<list of strings separated by 0x1E>` | ||
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| ### Market Create-Bid Required Attributes | ||
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| * Key: `0x01 | <market id (4 bytes)> | 0x09 | 0x01` | ||
| * Value: `<list of strings separated by 0x1E>` | ||
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| ### Market Account | ||
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| Each market has an associated `MarketAccount` with an address derived from the `market_id`. | ||
| Each `MarketAccount` is stored using the `Accounts` module. | ||
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| +++ https://github.com/provenance-io/provenance/blob/v1.17.0/proto/provenance/exchange/v1/market.proto#L14-L26 | ||
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| ### Market Details | ||
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| The [MarketDetails](03_messages.md#marketdetails) are stored as part of the `MarketAccount` (in the `x/auth` module). | ||
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| ### Known Market ID | ||
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| These entries are used to indicate that a given market exists. | ||
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| * Key: `0x07 | <market id (4 bytes)>` | ||
| * Value: `<nil (0 bytes)>` | ||
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| ### Last Market ID | ||
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| This indicates the last market-id that was auto-selected for use. | ||
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| When a `MsgGovCreateMarketRequest` is processed that has a `market_id` of `0` (zero), the next available market id is auto selected. | ||
| Starting with the number after what's in this state entry, each market id is sequentially checked until an available one is found. | ||
| The new market gets that id, then this entry is then updated to indicate what that was. | ||
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| * Key: `0x06` | ||
| * Value: `<market id (4 bytes)>` | ||
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| When a `MsgGovCreateMarketRequest` is processed that has a non-zero `market_id`, this entry is not considered or altered. | ||
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| ## Orders | ||
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| Each `<order id>` is a `uint64` (8 bytes) in big-endian order. | ||
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| Orders are stored using the following format: | ||
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| * Key: `0x02 | <order id (8 bytes)>` | ||
| * Value `<order type byte> | protobuf(order type)` | ||
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| The `<order type byte>` has these possible values: | ||
| * `0x00` => Ask Order | ||
| * `0x01` => Bid Order | ||
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| ### Ask Orders | ||
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| * Key: `0x02 | <order id (8 bytes)>` | ||
| * Value: `0x00 | protobuf(AskOrder)` | ||
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| See also: [AskOrder](03_messages.md#askorder). | ||
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| ### Bid Orders | ||
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| * Key: `0x02 | <order id (8 bytes)>` | ||
| * Value: `0x01 | protobuf(BidOrder)` | ||
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| See also: [BidOrder](03_messages.md#bidorder). | ||
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| ### Last Order ID | ||
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| Whenever an order is created, this value is looked up and incremented to get the new order's id. | ||
| Then this entry is updated to reflect the new order. | ||
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| * Key: `0x08` | ||
| * Value: `<order id (8 bytes)>` | ||
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| ## Indexes | ||
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| Several index entries are maintained to help facilitate look-ups. | ||
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| The `<order type byte>` values are the same as those described in [Orders](#orders). | ||
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| ### Market to Order | ||
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| This index can be used to find orders in a given market. | ||
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| * Key: `0x03 | <market id (4 bytes)> | <order id (8 bytes)>` | ||
| * Value: `<order type byte (1 byte)>` | ||
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| ### Owner Address to Order | ||
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| This index can be used to find orders with a given buyer or seller. | ||
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| * Key: `0x04 | <addr len (1 byte)> | <addr> | <order id (8 bytes)>` | ||
| * Value: `<order type byte (1 byte)>` | ||
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| ### Asset Denom to Order | ||
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| This index can be used to find orders involving a given `assets` denom. | ||
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| * Key: `0x05 | <asset denom> | <order id (8 bytes)>` | ||
| * Value: `<order type byte (1 byte)>` | ||
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| ### Market External ID to Order | ||
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| This index is used to look up orders by their market and external id. | ||
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| * Key: `0x09 | <market id (4 bytes)> | <external id (string)>` | ||
| * Value: `<order id (8 bytes)>` |
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