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January 24, 2024 01:23
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import type { AccountInfo } from "@solana/web3.js"; | |
import { Connection, PublicKey } from "@solana/web3.js"; | |
import { Big, BigUtils, bs58 } from "@switchboard-xyz/common"; | |
import { OracleJob } from "@switchboard-xyz/common"; | |
async function fetchLatestSlotHash( | |
connection: Connection | |
): Promise<[bigint, string]> { | |
const slotHashesSysvarKey = new PublicKey( | |
"SysvarS1otHashes111111111111111111111111111" | |
); | |
const accountInfo = await connection.getAccountInfo(slotHashesSysvarKey, { | |
commitment: "confirmed", | |
dataSlice: { length: 40, offset: 8 }, | |
}); | |
let buffer = accountInfo!.data; | |
const slotNumber = buffer.readBigUInt64LE(); | |
buffer = buffer.slice(8); | |
return [slotNumber, bs58.encode(buffer)]; | |
} | |
function buildBinanceComJob(pair: String): OracleJob { | |
let tasks = [ | |
OracleJob.Task.create({ | |
httpTask: OracleJob.HttpTask.create({ | |
url: `https://www.binance.com/api/v3/ticker/price?symbol=${pair}`, | |
}), | |
}), | |
OracleJob.Task.create({ | |
jsonParseTask: OracleJob.JsonParseTask.create({ path: "$.price" }), | |
}), | |
]; | |
return OracleJob.create({ | |
tasks, | |
}); | |
} | |
function encodeJobs(jobArray: OracleJob[][]): string[][] { | |
return jobArray.map((innerArray) => { | |
return innerArray.map((job) => | |
Buffer.from(OracleJob.encodeDelimited(job).finish()).toString("base64") | |
); | |
}); | |
} | |
(async () => { | |
const connection = new Connection( | |
"https://api.mainnet-beta.solana.com", | |
"confirmed" | |
); | |
const [slotNumber, slotHash] = await fetchLatestSlotHash(connection); | |
const encodedJobs = encodeJobs([[buildBinanceComJob("BTCUSDT")]]); | |
const requestBody = { | |
api_version: "1.0", // Example API version | |
jobs_b64_encoded: encodedJobs, // Example job clusters | |
chain_metadata: { | |
SolanaChainMeta: { | |
cluster: "devnet", // Example cluster | |
slot: Number(slotNumber), | |
recent_slothash: slotHash, | |
}, | |
}, | |
signature_scheme: "Ed25519", | |
hash_scheme: "Sha256", | |
}; | |
let apiUrl = "http://127.0.0.1:8080/feed_request"; | |
const resp = await fetch(apiUrl, { | |
method: "POST", | |
headers: { | |
"Content-Type": "application/json", | |
}, | |
body: JSON.stringify(requestBody), | |
}).then((response) => response.json()); | |
console.log(resp); | |
return; | |
})(); |
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