feat: Introduce GraphQLTokenFeeFetcher (no traffic - 4kb limit)

.github/workflows/test.yml

@@ -10,6 +10,9 @@ jobs:
   test:
     name: Run tests
     runs-on: ubuntu-latest
+    env:
+      GQL_URL: ${{ secrets.UNI_GRAPHQL_ENDPOINT }}
+      GQL_H_ORGN: ${{ secrets.UNI_GRAPHQL_HEADER_ORIGIN }}
 
     steps:
       - name: Checkout Repo

README.md

@@ -38,7 +38,9 @@ The best way to develop and test the API is to deploy your own instance to AWS.
    TENDERLY_PROJECT = '' # For enabling Tenderly simulations
    TENDERLY_ACCESS_KEY = '' # For enabling Tenderly simulations
    TENDERLY_NODE_API_KEY = '' # For enabling Tenderly node-level RPC access
-   ALCHEMY_QUERY_KEY = '' For Alchemy subgraph query access
+   ALCHEMY_QUERY_KEY = '' # For Alchemy subgraph query access
+   GQL_URL = '' # The GraphQL endpoint url, for Uniswap graphql query access
+   GQL_H_ORGN = '' # The GraphQL header origin, for Uniswap graphql query access
    ```
 3. Install and build the package
    ```

bin/app.ts

@@ -39,6 +39,8 @@ export class RoutingAPIStage extends Stage {
       unicornSecret: string
       alchemyQueryKey?: string
       decentralizedNetworkApiKey?: string
+      uniGraphQLEndpoint: string
+      uniGraphQLHeaderOrigin: string
     }
   ) {
     super(scope, id, props)
@@ -60,6 +62,8 @@ export class RoutingAPIStage extends Stage {
       unicornSecret,
       alchemyQueryKey,
       decentralizedNetworkApiKey,
+      uniGraphQLEndpoint,
+      uniGraphQLHeaderOrigin,
     } = props
 
     const { url } = new RoutingAPIStack(this, 'RoutingAPI', {
@@ -80,6 +84,8 @@ export class RoutingAPIStage extends Stage {
       unicornSecret,
       alchemyQueryKey,
       decentralizedNetworkApiKey,
+      uniGraphQLEndpoint,
+      uniGraphQLHeaderOrigin,
     })
     this.url = url
   }
@@ -255,6 +261,8 @@ export class RoutingAPIPipeline extends Stack {
       unicornSecret: unicornSecrets.secretValueFromJson('debug-config-unicorn-key').toString(),
       alchemyQueryKey: routingApiNewSecrets.secretValueFromJson('alchemy-query-key').toString(),
       decentralizedNetworkApiKey: routingApiNewSecrets.secretValueFromJson('decentralized-network-api-key').toString(),
+      uniGraphQLEndpoint: routingApiNewSecrets.secretValueFromJson('uni-graphql-endpoint').toString(),
+      uniGraphQLHeaderOrigin: routingApiNewSecrets.secretValueFromJson('uni-graphql-header-origin').toString(),
     })
 
     const betaUsEast2AppStage = pipeline.addStage(betaUsEast2Stage)
@@ -281,6 +289,8 @@ export class RoutingAPIPipeline extends Stack {
       unicornSecret: unicornSecrets.secretValueFromJson('debug-config-unicorn-key').toString(),
       alchemyQueryKey: routingApiNewSecrets.secretValueFromJson('alchemy-query-key').toString(),
       decentralizedNetworkApiKey: routingApiNewSecrets.secretValueFromJson('decentralized-network-api-key').toString(),
+      uniGraphQLEndpoint: routingApiNewSecrets.secretValueFromJson('uni-graphql-endpoint').toString(),
+      uniGraphQLHeaderOrigin: routingApiNewSecrets.secretValueFromJson('uni-graphql-header-origin').toString(),
     })
 
     const prodUsEast2AppStage = pipeline.addStage(prodUsEast2Stage)
@@ -417,6 +427,8 @@ new RoutingAPIStack(app, 'RoutingAPIStack', {
   tenderlyAccessKey: process.env.TENDERLY_ACCESS_KEY!,
   tenderlyNodeApiKey: process.env.TENDERLY_NODE_API_KEY!,
   unicornSecret: process.env.UNICORN_SECRET!,
+  uniGraphQLEndpoint: process.env.GQL_URL!,
+  uniGraphQLHeaderOrigin: process.env.GQL_H_ORGN!,
 })
 
 new RoutingAPIPipeline(app, 'RoutingAPIPipelineStack', {

bin/stacks/routing-api-stack.ts

@@ -49,6 +49,8 @@ export class RoutingAPIStack extends cdk.Stack {
       unicornSecret: string
       alchemyQueryKey?: string
       decentralizedNetworkApiKey?: string
+      uniGraphQLEndpoint: string
+      uniGraphQLHeaderOrigin: string
     }
   ) {
     super(parent, name, props)
@@ -72,6 +74,8 @@ export class RoutingAPIStack extends cdk.Stack {
       unicornSecret,
       alchemyQueryKey,
       decentralizedNetworkApiKey,
+      uniGraphQLEndpoint,
+      uniGraphQLHeaderOrigin,
     } = props
 
     const {
@@ -129,6 +133,8 @@ export class RoutingAPIStack extends cdk.Stack {
       tokenPropertiesCachingDynamoDb,
       rpcProviderHealthStateDynamoDb,
       unicornSecret,
+      uniGraphQLEndpoint,
+      uniGraphQLHeaderOrigin,
     })
 
     const accessLogGroup = new aws_logs.LogGroup(this, 'RoutingAPIGAccessLogs')

bin/stacks/routing-lambda-stack.ts

@@ -38,6 +38,8 @@ export interface RoutingLambdaStackProps extends cdk.NestedStackProps {
   tokenPropertiesCachingDynamoDb: aws_dynamodb.Table
   rpcProviderHealthStateDynamoDb: aws_dynamodb.Table
   unicornSecret: string
+  uniGraphQLEndpoint: string
+  uniGraphQLHeaderOrigin: string
 }
 export class RoutingLambdaStack extends cdk.NestedStack {
   public readonly routingLambda: aws_lambda_nodejs.NodejsFunction
@@ -68,6 +70,8 @@ export class RoutingLambdaStack extends cdk.NestedStack {
       tokenPropertiesCachingDynamoDb,
       rpcProviderHealthStateDynamoDb,
       unicornSecret,
+      uniGraphQLEndpoint,
+      uniGraphQLHeaderOrigin,
     } = props
 
     new CfnOutput(this, 'jsonRpcProviders', {
@@ -147,6 +151,8 @@ export class RoutingLambdaStack extends cdk.NestedStack {
         // we will start using the correct ones going forward
         TOKEN_PROPERTIES_CACHING_TABLE_NAME: tokenPropertiesCachingDynamoDb.tableName,
         UNICORN_SECRET: unicornSecret,
+        GQL_URL: uniGraphQLEndpoint,
+        GQL_H_ORGN: uniGraphQLHeaderOrigin,
         ...jsonRpcProviders,
       },
       layers: [

lib/graphql/graphql-client.ts

@@ -0,0 +1,38 @@
+import axios, { AxiosRequestConfig, AxiosResponse } from 'axios'
+
+import { GraphQLResponse } from './graphql-schemas'
+
+/* Interface for accessing any GraphQL API */
+export interface IGraphQLClient {
+  fetchData<T>(query: string, variables?: { [key: string]: any }): Promise<T>
+}
+
+/* Implementation of the IGraphQLClient interface to give access to any GraphQL API */
+export class GraphQLClient implements IGraphQLClient {
+  constructor(private readonly endpoint: string, private readonly headers: Record<string, string>) {}
+
+  async fetchData<T>(query: string, variables: { [key: string]: any } = {}): Promise<T> {
+    const requestConfig: AxiosRequestConfig = {
+      method: 'POST',
+      url: this.endpoint,
+      headers: this.headers,
+      data: { query, variables },
+    }
+
+    try {
+      const response: AxiosResponse<GraphQLResponse<T>> = await axios.request(requestConfig)
+      const responseBody = response.data
+      if (responseBody.errors) {
+        throw new Error(`GraphQL error! ${JSON.stringify(responseBody.errors)}`)
+      }
+
+      return responseBody.data
+    } catch (error) {
+      if (axios.isAxiosError(error)) {
+        throw new Error(`HTTP error! status: ${error.response?.status}`)
+      } else {
+        throw new Error(`Unexpected error: ${error}`)
+      }
+    }
+  }
+}

lib/graphql/graphql-provider.ts

@@ -0,0 +1,61 @@
+import { ChainId } from '@uniswap/sdk-core'
+
+import { GraphQLClient, IGraphQLClient } from './graphql-client'
+import {
+  GRAPHQL_QUERY_MULTIPLE_TOKEN_INFO_BY_CONTRACTS,
+  GRAPHQL_QUERY_TOKEN_INFO_BY_ADDRESS_CHAIN,
+} from './graphql-queries'
+import { TokenInfoResponse, TokensInfoResponse } from './graphql-schemas'
+
+/* Interface for accessing Uniswap GraphQL API */
+export interface IUniGraphQLProvider {
+  /* Fetch token info for a given chain and address */
+  getTokenInfo(chainId: ChainId, address: string): Promise<TokenInfoResponse>
+  /* Fetch token info for multiple tokens given a chain and addresses */
+  getTokensInfo(chainId: ChainId, addresses: string[]): Promise<TokensInfoResponse>
+  // Add more methods here as needed.
+  // - more details: https://github.com/Uniswap/data-api-graphql/blob/main/graphql/schema.graphql
+}
+
+/* Implementation of the UniGraphQLProvider interface to give access to Uniswap GraphQL API */
+export class UniGraphQLProvider implements IUniGraphQLProvider {
+  private readonly endpoint = process.env.GQL_URL!
+  private readonly headers = {
+    Origin: process.env.GQL_H_ORGN!,
+    'Content-Type': 'application/json',
+  }
+  private client: IGraphQLClient
+
+  constructor() {
+    this.client = new GraphQLClient(this.endpoint, this.headers)
+  }
+
+  /* Convert ChainId to a string recognized by data-graph-api graphql endpoint.
+   *  GraphQL Chain Enum located here: https://github.com/Uniswap/data-api-graphql/blob/main/graphql/schema.graphql#L155
+   *  */
+  private _chainIdToGraphQLChainName(chainId: ChainId): string | undefined {
+    // TODO: add complete list / use data-graphql-api to populate. Only MAINNET for now.
+    switch (chainId) {
+      case ChainId.MAINNET:
+        return 'ETHEREUM'
+      default:
+        throw new Error(`UniGraphQLProvider._chainIdToGraphQLChainName unsupported ChainId: ${chainId}`)
+    }
+  }
+
+  async getTokenInfo(chainId: ChainId, address: string): Promise<TokenInfoResponse> {
+    const query = GRAPHQL_QUERY_TOKEN_INFO_BY_ADDRESS_CHAIN
+    const variables = { chain: this._chainIdToGraphQLChainName(chainId), address: address }
+    return this.client.fetchData<TokenInfoResponse>(query, variables)
+  }
+
+  async getTokensInfo(chainId: ChainId, addresses: string[]): Promise<TokensInfoResponse> {
+    const query = GRAPHQL_QUERY_MULTIPLE_TOKEN_INFO_BY_CONTRACTS
+    const contracts = addresses.map((address) => ({
+      chain: this._chainIdToGraphQLChainName(chainId),
+      address: address,
+    }))
+    const variables = { contracts: contracts }
+    return this.client.fetchData<TokensInfoResponse>(query, variables)
+  }
+}

lib/graphql/graphql-queries.ts

@@ -0,0 +1,35 @@
+/* Query to get the token info by address and chain */
+export const GRAPHQL_QUERY_TOKEN_INFO_BY_ADDRESS_CHAIN = `
+query Token($chain: Chain!, $address: String!) {
+        token(chain: $chain, address: $address) {
+            name
+            chain
+            address
+            decimals
+            symbol
+            standard
+            feeData {
+                buyFeeBps
+                sellFeeBps
+            }
+        }
+    }
+`
+
+/* Query to get the token info by multiple addresses and chain */
+export const GRAPHQL_QUERY_MULTIPLE_TOKEN_INFO_BY_CONTRACTS = `
+query Tokens($contracts: [ContractInput!]!) {
+      tokens(contracts: $contracts) {
+          name
+          chain
+          address
+          decimals
+          symbol
+          standard
+          feeData {
+              buyFeeBps
+              sellFeeBps
+          }
+      }
+    }
+`

lib/graphql/graphql-schemas.ts

@@ -0,0 +1,25 @@
+export interface GraphQLResponse<T> {
+  data: T
+  errors?: Array<{ message: string }>
+}
+
+export interface TokenInfoResponse {
+  token: TokenInfo
+}
+
+export interface TokensInfoResponse {
+  tokens: TokenInfo[]
+}
+
+export interface TokenInfo {
+  name: string
+  chain: string
+  address: string
+  decimals: number
+  symbol: string
+  standard: string
+  feeData: {
+    buyFeeBps: string
+    sellFeeBps: string
+  }
+}

lib/graphql/graphql-token-fee-fetcher.ts

@@ -0,0 +1,75 @@
+import { ITokenFeeFetcher } from '@uniswap/smart-order-router/build/main/providers/token-fee-fetcher'
+import { IUniGraphQLProvider } from './graphql-provider'
+import { TokenFeeMap } from '@uniswap/smart-order-router/build/main/providers/token-fee-fetcher'
+import { ProviderConfig } from '@uniswap/smart-order-router/build/main/providers/provider'
+import { TokensInfoResponse } from './graphql-schemas'
+import { BigNumber } from 'ethers'
+import { ChainId } from '@uniswap/sdk-core'
+import { metric } from '@uniswap/smart-order-router/build/main/util/metric'
+import { log, MetricLoggerUnit } from '@uniswap/smart-order-router'
+
+/* Implementation of the ITokenFeeFetcher interface to give access to Uniswap GraphQL API token fee data.
+ * This fetcher is used to get token fees from GraphQL API and fallback to OnChainTokenFeeFetcher if GraphQL API fails
+ * or not all addresses could be fetched.
+ * Note: OnChainTokenFeeFetcher takes into account the provided blocknumber when retrieving token fees (through providerConfig),
+ * but GraphQLTokenFeeFetcher always returns the latest token fee (GraphQl doesn't keep historical data).
+ * FOT tax doesn't change often, hence ok to not use blocknumber here.
+ * */
+export class GraphQLTokenFeeFetcher implements ITokenFeeFetcher {
+  private readonly graphQLProvider: IUniGraphQLProvider
+  private readonly onChainFeeFetcherFallback: ITokenFeeFetcher
+  private readonly chainId: ChainId
+
+  constructor(
+    graphQLProvider: IUniGraphQLProvider,
+    onChainTokenFeeFetcherFallback: ITokenFeeFetcher,
+    chainId: ChainId
+  ) {
+    this.graphQLProvider = graphQLProvider
+    this.onChainFeeFetcherFallback = onChainTokenFeeFetcherFallback
+    this.chainId = chainId
+  }
+
+  async fetchFees(addresses: string[], providerConfig?: ProviderConfig): Promise<TokenFeeMap> {
+    let tokenFeeMap: TokenFeeMap = {}
+
+    try {
+      const tokenFeeResponse: TokensInfoResponse = await this.graphQLProvider.getTokensInfo(this.chainId, addresses)
+      tokenFeeResponse.tokens.forEach((token) => {
+        if (token.feeData.buyFeeBps || token.feeData.sellFeeBps) {
+          const buyFeeBps = token.feeData.buyFeeBps ? BigNumber.from(token.feeData.buyFeeBps) : undefined
+          const sellFeeBps = token.feeData.sellFeeBps ? BigNumber.from(token.feeData.sellFeeBps) : undefined
+          tokenFeeMap[token.address] = { buyFeeBps, sellFeeBps }
+        }
+      })
+
+      metric.putMetric('GraphQLTokenFeeFetcherFetchFeesSuccess', 1, MetricLoggerUnit.Count)
+    } catch (err) {
+      log.error({ err }, `Error calling GraphQLTokenFeeFetcher for tokens: ${addresses}`)
+
+      metric.putMetric('GraphQLTokenFeeFetcherFetchFeesFailure', 1, MetricLoggerUnit.Count)
+    }
+
+    // If we couldn't fetch all addresses from GraphQL then use fallback on chain fetcher for the rest.
+    const addressesToFetchFeesWithFallbackFetcher = addresses.filter((address) => !tokenFeeMap[address])
+    if (addressesToFetchFeesWithFallbackFetcher.length > 0) {
+      try {
+        const tokenFeeMapFromFallback = await this.onChainFeeFetcherFallback.fetchFees(
+          addressesToFetchFeesWithFallbackFetcher,
+          providerConfig
+        )
+        tokenFeeMap = {
+          ...tokenFeeMap,
+          ...tokenFeeMapFromFallback,
+        }
+      } catch (err) {
+        log.error(
+          { err },
+          `Error fetching fees for tokens ${addressesToFetchFeesWithFallbackFetcher} using onChain fallback`
+        )
+      }
+    }
+
+    return tokenFeeMap
+  }
+}