Feature/lastprices (#369)

* consume volume step 1

schema.graphql

@@ -58,6 +58,9 @@ type Token @entity {
 
     "block number when it was created"                                   
     block: Int!           
+
+    lastPriceToken: String!
+    lastPriceValue: BigDecimal!
 }
 
 "utility type"
@@ -261,6 +264,10 @@ type Order @entity {
   createdTimestamp: Int!
   tx: String!
   block: Int!
+
+  lastPriceToken: String!
+  lastPriceValue: BigDecimal!
+  estimatedUSDValue: BigDecimal!
 }
 
 # to be removed, mabye for pool shares only 

src/mappings/erc20Templates.ts

@@ -15,7 +15,7 @@ import {
 import { integer } from './utils/constants'
 import { weiToDecimal } from './utils/generic'
 import { addOrder } from './utils/globalUtils'
-import { getToken } from './utils/tokenUtils'
+import { getToken, getUSDValue } from './utils/tokenUtils'
 import { getUser } from './utils/userUtils'
 
 function getOrderId(
@@ -63,7 +63,13 @@ export function handleOrderStarted(event: OrderStarted): void {
   order.createdTimestamp = event.block.timestamp.toI32()
   order.tx = event.transaction.hash.toHex()
   order.block = event.block.number.toI32()
-
+  order.lastPriceToken = token.lastPriceToken
+  order.lastPriceValue = token.lastPriceValue
+  order.estimatedUSDValue = getUSDValue(
+    order.lastPriceToken,
+    order.lastPriceValue,
+    order.createdTimestamp
+  )
   order.save()
   token.save()
   addOrder()

src/mappings/fixedRateExchange.ts

@@ -199,6 +199,15 @@ export function handleSwap(event: Swapped): void {
       event.params.tokenOutAddress.toHexString(),
       swap.baseTokenAmount
     )
+
+  // update datatoken lastPriceToken and lastPriceValue
+  const datatoken = getToken(
+    Address.fromString(fixedRateExchange.datatoken),
+    true
+  )
+  datatoken.lastPriceToken = fixedRateExchange.baseToken
+  datatoken.lastPriceValue = fixedRateExchange.price
+  datatoken.save()
 }
 
 export function handlePublishMarketFeeChanged(

src/mappings/pool.ts

@@ -1,4 +1,4 @@
-import { BigInt } from '@graphprotocol/graph-ts'
+import { BigInt, Address } from '@graphprotocol/graph-ts'
 import {
   LOG_EXIT,
   LOG_JOIN,
@@ -177,6 +177,12 @@ export function handleSwap(event: LOG_SWAP): void {
   poolSnapshot.save()
   poolTx.save()
   pool.save()
+
+  // update datatoken lastPriceToken and lastPriceValue
+  const datatoken = getToken(Address.fromString(pool.datatoken), true)
+  datatoken.lastPriceToken = pool.baseToken
+  datatoken.lastPriceValue = spotPrice
+  datatoken.save()
 }
 
 // setup is just to set token weight(it will mostly be 50:50) and spotPrice

src/mappings/utils/tokenUtils.ts

@@ -1,8 +1,9 @@
-import { Address, log } from '@graphprotocol/graph-ts'
+import { Address, log, BigDecimal } from '@graphprotocol/graph-ts'
 import { Nft, Token } from '../../@types/schema'
 import { ERC20 } from '../../@types/templates/ERC20Template/ERC20'
 import { ERC20Template, ERC721Template } from '../../@types/templates'
 import { addNft } from './globalUtils'
+import { ZERO_ADDRESS } from './constants'
 
 export function createToken(address: Address, isDatatoken: boolean): Token {
   log.debug('started creating token with address: {}', [address.toHexString()])
@@ -22,6 +23,8 @@ export function createToken(address: Address, isDatatoken: boolean): Token {
   const decimals = contract.try_decimals()
   if (decimals.reverted) token.decimals = 18
   else token.decimals = decimals.value
+  token.lastPriceToken = ZERO_ADDRESS
+  token.lastPriceValue = BigDecimal.zero()
   token.save()
   return token
 }
@@ -56,3 +59,11 @@ export function getNftToken(address: Address): Nft {
   }
   return newToken
 }
+
+export function getUSDValue(
+  address: string,
+  value: BigDecimal,
+  timestamp: number
+): BigDecimal {
+  return BigDecimal.zero()
+}