Documentation Index
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按地址、所属程序、数据大小或 memcmp 筛选账户更新，并使用数据切片减少传输量。
owner 筛选的是账户所属程序，不是持有账户内代币的钱包。
先将快速入门中的辅助代码保存为同一目录的 stream.mts。以下示例使用相同的环境变量与依赖。
import bs58 from "bs58";
import { subscribe } from "./stream.mts";
const address = process.env.ACCOUNT_ADDRESS;
if (!address) throw new Error("Set ACCOUNT_ADDRESS");
for await (const update of subscribe({
accounts: { selected: { account: [address], owner: [], filters: [] } },
})) {
const account = update.account?.account;
if (!account) continue;
console.log({
address: bs58.encode(account.pubkey),
owner: bs58.encode(account.owner),
lamports: account.lamports,
slot: update.account!.slot,
writeVersion: account.writeVersion,
dataBytes: account.data.length,
});
}
export ACCOUNT_ADDRESS="YOUR_ACCOUNT_ADDRESS"
npx tsx accounts.mts
subscribe(request) 即可。
import { makeRequest } from "./stream.mts";
const tokenProgram = "TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA";
const mint = process.env.TOKEN_MINT;
if (!mint) throw new Error("Set TOKEN_MINT");
const request = makeRequest({
accounts: {
tokenAccounts: {
account: [],
owner: [tokenProgram],
filters: [
{ datasize: "165" },
{ memcmp: { offset: "0", base58: mint } },
],
},
},
accountsDataSlice: [{ offset: "64", length: "8" }],
});
datasize，偏移量使用字符串。同一命名账户筛选器中的条件组合使用；不同选择可分别命名。
// A slice of bytes 64–71 from a legacy SPL token account contains its amount.
const amount = Buffer.from(account.data).readBigUInt64LE(0);
console.log(amount.toString());
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