Orders state

src/custom/state/index.ts

@@ -13,6 +13,7 @@ import burn from '@src/state/burn/reducer'
 import multicall from '@src/state/multicall/reducer'
 // CUSTOM REDUCERS
 import operator from './operator/reducer'
+import orders from './orders/reducer'
 
 const UNISWAP_REDUCERS = {
   application,
@@ -25,12 +26,13 @@ const UNISWAP_REDUCERS = {
   lists
 }
 
-const PERSISTED_KEYS: string[] = ['user', 'transactions', 'lists']
+const PERSISTED_KEYS: string[] = ['user', 'transactions', 'lists', 'orders']
 
 const store = configureStore({
   reducer: {
     ...UNISWAP_REDUCERS,
-    operator
+    operator,
+    orders
   },
   middleware: [...getDefaultMiddleware({ thunk: false }), save({ states: PERSISTED_KEYS })],
   preloadedState: load({ states: PERSISTED_KEYS })

src/custom/state/orders/actions.ts

@@ -0,0 +1,57 @@
+import { createAction } from '@reduxjs/toolkit'
+import { ChainId } from '@uniswap/sdk'
+
+enum OrderKind {
+  SELL = 'sell',
+  BUY = 'buy'
+}
+
+// posted to /api/v1/orders on Order creation
+// serializable, so no BigNumbers
+export interface OrderCreation {
+  sellToken: string // address, without '0x' prefix
+  buyToken: string // address, without '0x' prefix
+  sellAmount: string // in atoms
+  buyAmount: string // in atoms
+  validTo: number // unix timestamp, seconds, use new Date(validTo * 1000)
+  appData: number // arbitrary identifier sent along with the order
+  tip: string // in atoms
+  orderType: OrderKind
+  partiallyFillable: boolean
+  signature: string // 65 bytes encoded as hex without `0x` prefix. v + r + s from the spec
+}
+
+export enum OrderStatus {
+  PENDING = 'pending',
+  FULFILLED = 'fulfilled'
+}
+
+// used internally by dapp
+export interface Order extends OrderCreation {
+  id: OrderID // it is special :), Unique identifier for the order: 56 bytes encoded as hex without 0x
+  owner: string // address, without '0x' prefix
+  status: OrderStatus
+  fulfillmentTime?: string
+  creationTime: string
+  summary: string // for dapp use only, readable by user
+}
+
+// gotten from querying /api/v1/orders
+export interface OrderFromApi extends OrderCreation {
+  creationTime: string // Creation time of the order. Encoded as ISO 8601 UTC
+  owner: string // address, without '0x' prefix
+}
+
+/**
+ * Unique identifier for the order, calculated by keccak256(orderDigest, ownerAddress, validTo),
+   where orderDigest = keccak256(orderStruct). bytes32.
+ */
+export type OrderID = string
+
+export const addPendingOrder = createAction<{ id: OrderID; chainId: ChainId; order: Order }>('order/addPendingOrder')
+export const removeOrder = createAction<{ id: OrderID; chainId: ChainId }>('order/removeOrder')
+//                                                                        fulfillmentTime from event timestamp
+export const fulfillOrder = createAction<{ id: OrderID; chainId: ChainId; fulfillmentTime: string }>(
+  'order/fulfillOrder'
+)
+export const clearOrders = createAction<{ chainId: ChainId }>('order/clearOrders')

src/custom/state/orders/hooks.ts

@@ -0,0 +1,97 @@
+import { ChainId } from '@uniswap/sdk'
+import { useCallback, useMemo } from 'react'
+import { useDispatch, useSelector } from 'react-redux'
+
+import { AppDispatch, AppState } from 'state'
+import { addPendingOrder, removeOrder, clearOrders, fulfillOrder, Order, OrderID } from './actions'
+import { OrdersState, PartialOrdersMap } from './reducer'
+import { isTruthy } from 'utils/misc'
+
+interface AddPendingOrderParams extends GetRemoveOrderParams {
+  order: Order
+}
+
+interface FulfillOrderParams extends GetRemoveOrderParams {
+  fulfillmentTime: string
+}
+interface GetRemoveOrderParams {
+  id: OrderID
+  chainId: ChainId
+}
+
+interface ClearOrdersParams {
+  chainId: ChainId
+}
+
+type GetOrdersParams = Pick<GetRemoveOrderParams, 'chainId'>
+
+type AddOrderCallback = (addOrderParams: AddPendingOrderParams) => void
+type RemoveOrderCallback = (clearOrderParams: GetRemoveOrderParams) => void
+type FulfillOrderCallback = (fulfillOrderParams: FulfillOrderParams) => void
+type ClearOrdersCallback = (clearOrdersParams: ClearOrdersParams) => void
+
+export const useOrder = ({ id, chainId }: GetRemoveOrderParams): Order | undefined => {
+  const state = useSelector<AppState, OrdersState[ChainId]>(state => state.orders[chainId])
+
+  return state?.fulfilled[id]?.order || state?.pending[id]?.order
+}
+
+export const useOrders = ({ chainId }: GetOrdersParams): Order[] => {
+  const state = useSelector<AppState, OrdersState[ChainId]>(state => state.orders?.[chainId])
+
+  return useMemo(() => {
+    if (!state) return []
+
+    const allOrders = Object.values(state.fulfilled)
+      .concat(Object.values(state.pending))
+      .map(orderObject => orderObject?.order)
+      .filter(isTruthy)
+    return allOrders
+  }, [state])
+}
+
+export const usePendingOrders = ({ chainId }: GetOrdersParams): Order[] => {
+  const state = useSelector<AppState, PartialOrdersMap | undefined>(state => state.orders?.[chainId]?.pending)
+
+  return useMemo(() => {
+    if (!state) return []
+
+    const allOrders = Object.values(state)
+      .map(orderObject => orderObject?.order)
+      .filter(isTruthy)
+    return allOrders
+  }, [state])
+}
+
+export const useFulfilledOrders = ({ chainId }: GetOrdersParams): Order[] => {
+  const state = useSelector<AppState, PartialOrdersMap | undefined>(state => state.orders?.[chainId]?.fulfilled)
+
+  return useMemo(() => {
+    if (!state) return []
+
+    const allOrders = Object.values(state)
+      .map(orderObject => orderObject?.order)
+      .filter(isTruthy)
+    return allOrders
+  }, [state])
+}
+
+export const useAddPendingOrder = (): AddOrderCallback => {
+  const dispatch = useDispatch<AppDispatch>()
+  return useCallback((addOrderParams: AddPendingOrderParams) => dispatch(addPendingOrder(addOrderParams)), [dispatch])
+}
+
+export const useFulfillOrder = (): FulfillOrderCallback => {
+  const dispatch = useDispatch<AppDispatch>()
+  return useCallback((fulfillOrderParams: FulfillOrderParams) => dispatch(fulfillOrder(fulfillOrderParams)), [dispatch])
+}
+
+export const useRemoveOrder = (): RemoveOrderCallback => {
+  const dispatch = useDispatch<AppDispatch>()
+  return useCallback((removeOrderParams: GetRemoveOrderParams) => dispatch(removeOrder(removeOrderParams)), [dispatch])
+}
+
+export const useClearOrders = (): ClearOrdersCallback => {
+  const dispatch = useDispatch<AppDispatch>()
+  return useCallback((clearOrdersParams: ClearOrdersParams) => dispatch(clearOrders(clearOrdersParams)), [dispatch])
+}

src/custom/state/orders/reducer.ts

@@ -0,0 +1,93 @@
+import { createReducer, PayloadAction } from '@reduxjs/toolkit'
+import { ChainId } from '@uniswap/sdk'
+import { addPendingOrder, removeOrder, Order, OrderID, clearOrders, fulfillOrder, OrderStatus } from './actions'
+
+export interface OrderObject {
+  id: OrderID
+  order: Order
+}
+
+// {order uuid => OrderObject} mapping
+type OrdersMap = Record<OrderID, OrderObject>
+export type PartialOrdersMap = Partial<OrdersMap>
+
+export type OrdersState = {
+  readonly [chainId in ChainId]?: {
+    pending: PartialOrdersMap
+    fulfilled: PartialOrdersMap
+  }
+}
+
+interface PrefillStateRequired {
+  chainId: ChainId
+}
+
+type Writable<T> = {
+  -readonly [K in keyof T]: T[K]
+}
+
+// makes sure there's always an object at state[chainId], state[chainId].pending | .fulfilled
+function prefillState(
+  state: Writable<OrdersState>,
+  { payload: { chainId } }: PayloadAction<PrefillStateRequired>
+): asserts state is Required<OrdersState> {
+  // asserts that state[chainId].pending | .fulfilled is ok to access
+  const stateAtChainId = state[chainId]
+
+  if (!stateAtChainId) {
+    state[chainId] = {
+      pending: {},
+      fulfilled: {}
+    }
+    return
+  }
+
+  if (!stateAtChainId.pending) {
+    stateAtChainId.pending = {}
+  }
+
+  if (!stateAtChainId.fulfilled) {
+    stateAtChainId.fulfilled = {}
+  }
+}
+
+const initialState: OrdersState = {}
+
+export default createReducer(initialState, builder =>
+  builder
+    .addCase(addPendingOrder, (state, action) => {
+      prefillState(state, action)
+      const { order, id, chainId } = action.payload
+
+      state[chainId].pending[id] = { order, id }
+    })
+    .addCase(removeOrder, (state, action) => {
+      prefillState(state, action)
+      const { id, chainId } = action.payload
+      delete state[chainId].pending[id]
+      delete state[chainId].fulfilled[id]
+    })
+    .addCase(fulfillOrder, (state, action) => {
+      prefillState(state, action)
+      const { id, chainId, fulfillmentTime } = action.payload
+
+      const orderObject = state[chainId].pending[id]
+
+      if (orderObject) {
+        delete state[chainId].pending[id]
+
+        orderObject.order.status = OrderStatus.FULFILLED
+        orderObject.order.fulfillmentTime = fulfillmentTime
+
+        state[chainId].fulfilled[id] = orderObject
+      }
+    })
+    .addCase(clearOrders, (state, action) => {
+      const { chainId } = action.payload
+
+      state[chainId] = {
+        pending: {},
+        fulfilled: {}
+      }
+    })
+)

src/custom/utils/misc.ts

@@ -0,0 +1 @@
+export const isTruthy = <T>(value: T | null | undefined | false): value is T => !!value