OPDATA-4861: Add buffer-layout endpoint to solana-functions (#4156)

* Copy sanctum-infinity

* Add buffer-layout endpoint to solana-functions

* changeset

Author: dskloetc

.changeset/tiny-ligers-brake.md

@@ -0,0 +1,5 @@
+---
+'@chainlink/solana-functions-adapter': minor
+---
+
+Add buffer-layout endpoint

packages/sources/solana-functions/src/endpoint/buffer-layout.ts

@@ -0,0 +1,43 @@
+import { AdapterEndpoint } from '@chainlink/external-adapter-framework/adapter'
+import { InputParameters } from '@chainlink/external-adapter-framework/validation'
+import { config } from '../config'
+import { bufferLayoutTransport } from '../transport/buffer-layout'
+
+export const inputParameters = new InputParameters(
+  {
+    stateAccountAddress: {
+      description: 'The state account address for the program',
+      type: 'string',
+      required: true,
+    },
+    field: {
+      description: 'The name of the field to retrieve from the state account',
+      type: 'string',
+      required: true,
+    },
+  },
+  [
+    {
+      stateAccountAddress: 'TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA',
+      field: 'supply',
+    },
+  ],
+)
+
+export type BaseEndpointTypes = {
+  Parameters: typeof inputParameters.definition
+  Response: {
+    Data: {
+      result: string
+    }
+    Result: string
+  }
+  Settings: typeof config.settings
+}
+
+export const endpoint = new AdapterEndpoint({
+  name: 'buffer-layout',
+  aliases: [],
+  transport: bufferLayoutTransport,
+  inputParameters,
+})

packages/sources/solana-functions/src/endpoint/index.ts

@@ -1,3 +1,4 @@
 export { endpoint as anchorData } from './anchor-data'
+export { endpoint as bufferLayout } from './buffer-layout'
 export { endpoint as eusxPrice } from './eusx-price'
 export { endpoint as sanctumInfinity } from './sanctum-infinity'

packages/sources/solana-functions/src/index.ts

@@ -1,13 +1,13 @@
 import { expose, ServerInstance } from '@chainlink/external-adapter-framework'
 import { Adapter } from '@chainlink/external-adapter-framework/adapter'
 import { config } from './config'
-import { anchorData, eusxPrice, sanctumInfinity } from './endpoint'
+import { anchorData, bufferLayout, eusxPrice, sanctumInfinity } from './endpoint'
 
 export const adapter = new Adapter({
   defaultEndpoint: eusxPrice.name,
   name: 'SOLANA_FUNCTIONS',
   config,
-  endpoints: [eusxPrice, anchorData, sanctumInfinity],
+  endpoints: [eusxPrice, anchorData, sanctumInfinity, bufferLayout],
 })
 
 export const server = (): Promise<ServerInstance | undefined> => expose(adapter)

packages/sources/solana-functions/src/transport/buffer-layout.ts

@@ -0,0 +1,84 @@
+import { EndpointContext } from '@chainlink/external-adapter-framework/adapter'
+import { TransportDependencies } from '@chainlink/external-adapter-framework/transports'
+import { SubscriptionTransport } from '@chainlink/external-adapter-framework/transports/abstract/subscription'
+import { AdapterResponse, makeLogger, sleep } from '@chainlink/external-adapter-framework/util'
+import { AdapterInputError } from '@chainlink/external-adapter-framework/validation/error'
+import { type Rpc, type SolanaRpcApi } from '@solana/rpc'
+import { BaseEndpointTypes, inputParameters } from '../endpoint/buffer-layout'
+import { fetchFieldFromBufferLayoutStateAccount } from '../shared/buffer-layout-accounts'
+import { SolanaRpcFactory } from '../shared/solana-rpc-factory'
+
+const logger = makeLogger('BufferLayoutTransport')
+
+type RequestParams = typeof inputParameters.validated
+
+export class BufferLayoutTransport extends SubscriptionTransport<BaseEndpointTypes> {
+  rpc!: Rpc<SolanaRpcApi>
+
+  async initialize(
+    dependencies: TransportDependencies<BaseEndpointTypes>,
+    adapterSettings: BaseEndpointTypes['Settings'],
+    endpointName: string,
+    transportName: string,
+  ): Promise<void> {
+    await super.initialize(dependencies, adapterSettings, endpointName, transportName)
+    this.rpc = new SolanaRpcFactory().create(adapterSettings.RPC_URL)
+  }
+
+  async backgroundHandler(context: EndpointContext<BaseEndpointTypes>, entries: RequestParams[]) {
+    await Promise.all(entries.map(async (param) => this.handleRequest(param)))
+    await sleep(context.adapterSettings.BACKGROUND_EXECUTE_MS)
+  }
+
+  async handleRequest(param: RequestParams) {
+    let response: AdapterResponse<BaseEndpointTypes['Response']>
+    try {
+      response = await this._handleRequest(param)
+    } catch (e: unknown) {
+      const errorMessage = e instanceof Error ? e.message : 'Unknown error occurred'
+      logger.error(e, errorMessage)
+      response = {
+        statusCode: (e as AdapterInputError)?.statusCode || 502,
+        errorMessage,
+        timestamps: {
+          providerDataRequestedUnixMs: 0,
+          providerDataReceivedUnixMs: 0,
+          providerIndicatedTimeUnixMs: undefined,
+        },
+      }
+    }
+
+    await this.responseCache.write(this.name, [{ params: param, response }])
+  }
+
+  async _handleRequest(
+    params: RequestParams,
+  ): Promise<AdapterResponse<BaseEndpointTypes['Response']>> {
+    const providerDataRequestedUnixMs = Date.now()
+
+    const result = await fetchFieldFromBufferLayoutStateAccount({
+      stateAccountAddress: params.stateAccountAddress,
+      field: params.field,
+      rpc: this.rpc,
+    })
+
+    return {
+      data: {
+        result,
+      },
+      statusCode: 200,
+      result,
+      timestamps: {
+        providerDataRequestedUnixMs,
+        providerDataReceivedUnixMs: Date.now(),
+        providerIndicatedTimeUnixMs: undefined,
+      },
+    }
+  }
+
+  getSubscriptionTtlFromConfig(adapterSettings: BaseEndpointTypes['Settings']): number {
+    return adapterSettings.WARMUP_SUBSCRIPTION_TTL
+  }
+}
+
+export const bufferLayoutTransport = new BufferLayoutTransport()

packages/sources/solana-functions/test/fixtures/usdc-minter-account-data-2025-10-27.json

@@ -0,0 +1,21 @@
+{
+  "jsonrpc": "2.0",
+  "result": {
+    "context": {
+      "apiVersion": "3.0.7",
+      "slot": 376122381
+    },
+    "value": {
+      "data": [
+        "AQAAAJj+huiNm+Lqi8HMpIeLKYjCQPUrhCS/tA7Rot3LXhmbBNbXhrT9IwAGAQEAAABicKqKWcWUBbRShshncubNEm6bil06OFNtN/e0FOi2Zw==",
+        "base64"
+      ],
+      "executable": false,
+      "lamports": 419286183851,
+      "owner": "TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA",
+      "rentEpoch": 18446744073709551615,
+      "space": 82
+    }
+  },
+  "id": 1
+}

packages/sources/solana-functions/test/integration/__snapshots__/buffer-layout.test.ts.snap

@@ -0,0 +1,15 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`execute buffer-layout should return success USDC supply 1`] = `
+{
+  "data": {
+    "result": "10130575983105540",
+  },
+  "result": "10130575983105540",
+  "statusCode": 200,
+  "timestamps": {
+    "providerDataReceivedUnixMs": 978347471111,
+    "providerDataRequestedUnixMs": 978347471111,
+  },
+}
+`;

packages/sources/solana-functions/test/integration/buffer-layout.test.ts

@@ -0,0 +1,67 @@
+import {
+  TestAdapter,
+  makeStub,
+  setEnvVariables,
+} from '@chainlink/external-adapter-framework/util/testing-utils'
+import * as usdcMinterAccountData from '../fixtures/usdc-minter-account-data-2025-10-27.json'
+
+const usdcMinterAddress = 'EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v'
+
+const solanaRpc = makeStub('solanaRpc', {
+  getAccountInfo: (address: string) => ({
+    async send() {
+      switch (address) {
+        case usdcMinterAddress:
+          return usdcMinterAccountData.result
+      }
+      throw new Error(`Unexpected account address: ${address}`)
+    },
+  }),
+})
+
+const createSolanaRpc = () => solanaRpc
+
+jest.mock('@solana/rpc', () => ({
+  createSolanaRpc() {
+    return createSolanaRpc()
+  },
+}))
+
+describe('execute', () => {
+  let spy: jest.SpyInstance
+  let testAdapter: TestAdapter
+  let oldEnv: NodeJS.ProcessEnv
+
+  beforeAll(async () => {
+    oldEnv = JSON.parse(JSON.stringify(process.env))
+    process.env.RPC_URL = 'solana.rpc.url'
+    process.env.BACKGROUND_EXECUTE_MS = process.env.BACKGROUND_EXECUTE_MS ?? '0'
+    const mockDate = new Date('2001-01-01T11:11:11.111Z')
+    spy = jest.spyOn(Date, 'now').mockReturnValue(mockDate.getTime())
+
+    const adapter = (await import('./../../src')).adapter
+    adapter.rateLimiting = undefined
+    testAdapter = await TestAdapter.startWithMockedCache(adapter, {
+      testAdapter: {} as TestAdapter<never>,
+    })
+  })
+
+  afterAll(async () => {
+    setEnvVariables(oldEnv)
+    await testAdapter.api.close()
+    spy.mockRestore()
+  })
+
+  describe('buffer-layout', () => {
+    it('should return success USDC supply', async () => {
+      const data = {
+        endpoint: 'buffer-layout',
+        stateAccountAddress: usdcMinterAddress,
+        field: 'supply',
+      }
+      const response = await testAdapter.request(data)
+      expect(response.json()).toMatchSnapshot()
+      expect(response.statusCode).toBe(200)
+    })
+  })
+})