2018-08-23 10:52:48 -07:00
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// @flow
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import assert from 'assert';
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import fetch from 'node-fetch';
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import jayson from 'jayson/lib/client/browser';
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import {struct} from 'superstruct';
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2018-09-14 08:27:40 -07:00
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import {Transaction} from './transaction';
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2018-09-30 18:42:45 -07:00
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import {PublicKey} from './publickey';
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2018-10-22 15:31:56 -07:00
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import {sleep} from './util/sleep';
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2018-09-30 18:42:45 -07:00
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import type {Account} from './account';
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2018-09-13 18:48:51 -07:00
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import type {TransactionSignature, TransactionId} from './transaction';
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2018-08-23 10:52:48 -07:00
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2018-08-23 20:10:30 -07:00
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type RpcRequest = (methodName: string, args: Array<any>) => any;
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2018-08-23 10:52:48 -07:00
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function createRpcRequest(url): RpcRequest {
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const server = jayson(
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async (request, callback) => {
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const options = {
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method: 'POST',
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body: request,
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headers: {
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'Content-Type': 'application/json',
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}
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};
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try {
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const res = await fetch(url, options);
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const text = await res.text();
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callback(null, text);
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} catch (err) {
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callback(err);
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}
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}
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);
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return (method, args) => {
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return new Promise((resolve, reject) => {
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server.request(method, args, (err, response) => {
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if (err) {
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reject(err);
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return;
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}
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resolve(response);
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});
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});
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};
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}
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2018-08-24 10:39:51 -07:00
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2018-08-24 09:05:23 -07:00
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/**
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* Expected JSON RPC response for the "getBalance" message
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*/
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2018-08-23 10:52:48 -07:00
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const GetBalanceRpcResult = struct({
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jsonrpc: struct.literal('2.0'),
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id: 'string',
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error: 'any?',
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result: 'number?',
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});
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2018-09-20 15:08:52 -07:00
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2018-09-26 19:54:59 -07:00
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/**
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* @private
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*/
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function jsonRpcResult(resultDescription: any) {
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const jsonRpcVersion = struct.literal('2.0');
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return struct.union([
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struct({
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jsonrpc: jsonRpcVersion,
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id: 'string',
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error: 'any'
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}),
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struct({
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jsonrpc: jsonRpcVersion,
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id: 'string',
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error: 'null?',
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result: resultDescription,
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}),
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]);
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}
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2018-09-20 15:08:52 -07:00
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/**
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* Expected JSON RPC response for the "getAccountInfo" message
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*/
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2018-09-26 19:54:59 -07:00
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const GetAccountInfoRpcResult = jsonRpcResult({
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2018-10-17 09:35:24 -07:00
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executable: 'boolean',
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loader_program_id: 'array',
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2018-09-26 19:54:59 -07:00
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program_id: 'array',
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tokens: 'number',
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userdata: 'array',
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2018-09-20 15:08:52 -07:00
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});
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2018-08-24 09:05:23 -07:00
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/**
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* Expected JSON RPC response for the "confirmTransaction" message
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*/
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2018-09-26 19:54:59 -07:00
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const ConfirmTransactionRpcResult = jsonRpcResult('boolean');
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2018-08-23 10:52:48 -07:00
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2018-09-26 19:16:17 -07:00
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/**
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* Expected JSON RPC response for the "getSignatureStatus" message
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*/
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2018-09-26 19:54:59 -07:00
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const GetSignatureStatusRpcResult = jsonRpcResult(struct.enum([
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2018-10-23 13:10:08 -07:00
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'AccountInUse',
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'Confirmed',
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'GenericFailure',
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2018-10-23 13:10:08 -07:00
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'ProgramRuntimeError',
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'SignatureNotFound',
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2018-09-26 19:54:59 -07:00
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]));
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2018-09-26 19:16:17 -07:00
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2018-08-24 09:05:23 -07:00
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/**
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* Expected JSON RPC response for the "getTransactionCount" message
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*/
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2018-09-26 19:54:59 -07:00
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const GetTransactionCountRpcResult = jsonRpcResult('number');
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2018-08-23 10:52:48 -07:00
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2018-08-24 09:05:23 -07:00
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/**
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* Expected JSON RPC response for the "getLastId" message
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*/
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2018-09-26 19:54:59 -07:00
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const GetLastId = jsonRpcResult('string');
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2018-08-23 10:52:48 -07:00
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2018-08-24 09:05:23 -07:00
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/**
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* Expected JSON RPC response for the "getFinality" message
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*/
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2018-09-26 19:54:59 -07:00
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const GetFinalityRpcResult = jsonRpcResult('number');
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2018-08-24 09:05:23 -07:00
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/**
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* Expected JSON RPC response for the "requestAirdrop" message
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*/
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2018-09-26 19:54:59 -07:00
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const RequestAirdropRpcResult = jsonRpcResult('string');
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2018-08-24 09:05:23 -07:00
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/**
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* Expected JSON RPC response for the "sendTransaction" message
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*/
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2018-09-26 19:54:59 -07:00
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const SendTokensRpcResult = jsonRpcResult('string');
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2018-08-23 10:52:48 -07:00
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2018-09-20 15:08:52 -07:00
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/**
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* Information describing an account
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2018-09-20 15:35:41 -07:00
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*
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* @typedef {Object} AccountInfo
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* @property {number} tokens Number of tokens assigned to the account
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* @property {PublicKey} programId Identifier of the program assigned to the account
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* @property {?Buffer} userdata Optional userdata assigned to the account
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2018-09-20 15:08:52 -07:00
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*/
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type AccountInfo = {
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2018-10-17 09:35:24 -07:00
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executable: boolean;
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programId: PublicKey,
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2018-10-17 09:35:24 -07:00
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tokens: number,
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2018-09-28 22:51:52 -07:00
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userdata: Buffer,
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2018-09-20 15:08:52 -07:00
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}
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2018-09-26 19:16:17 -07:00
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/**
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* Possible signature status values
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*
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* @typedef {string} SignatureStatus
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*/
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2018-10-23 13:10:08 -07:00
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export type SignatureStatus = 'Confirmed'
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| 'AccountInUse'
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| 'SignatureNotFound'
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| 'ProgramRuntimeError'
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| 'GenericFailure';
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2018-09-26 19:16:17 -07:00
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2018-08-24 09:05:23 -07:00
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/**
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* A connection to a fullnode JSON RPC endpoint
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*/
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2018-08-23 10:52:48 -07:00
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export class Connection {
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_rpcRequest: RpcRequest;
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2018-10-22 20:03:44 -07:00
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_lastIdInfo: {
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lastId: TransactionId | null,
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seconds: number,
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transactionSignatures: Array<string>,
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};
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_disableLastIdCaching: boolean = false
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2018-08-23 10:52:48 -07:00
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2018-08-24 09:05:23 -07:00
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/**
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* Establish a JSON RPC connection
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*
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* @param endpoint URL to the fullnode JSON RPC endpoint
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*/
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2018-08-23 10:52:48 -07:00
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constructor(endpoint: string) {
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2018-08-23 19:47:00 -07:00
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if (typeof endpoint !== 'string') {
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throw new Error('Connection endpoint not specified');
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}
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this._rpcRequest = createRpcRequest(endpoint);
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2018-10-22 20:03:44 -07:00
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this._lastIdInfo = {
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lastId: null,
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seconds: -1,
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transactionSignatures: [],
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};
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2018-08-23 10:52:48 -07:00
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}
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2018-08-24 09:05:23 -07:00
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/**
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* Fetch the balance for the specified public key
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*/
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async getBalance(publicKey: PublicKey): Promise<number> {
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2018-08-23 10:52:48 -07:00
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const unsafeRes = await this._rpcRequest(
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'getBalance',
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2018-09-30 18:42:45 -07:00
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[publicKey.toBase58()]
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2018-08-23 10:52:48 -07:00
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);
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const res = GetBalanceRpcResult(unsafeRes);
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if (res.error) {
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throw new Error(res.error.message);
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}
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assert(typeof res.result !== 'undefined');
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return res.result;
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}
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2018-09-20 15:08:52 -07:00
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/**
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* Fetch all the account info for the specified public key
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*/
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async getAccountInfo(publicKey: PublicKey): Promise<AccountInfo> {
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const unsafeRes = await this._rpcRequest(
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'getAccountInfo',
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[publicKey.toBase58()]
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2018-09-20 15:08:52 -07:00
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);
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const res = GetAccountInfoRpcResult(unsafeRes);
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if (res.error) {
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throw new Error(res.error.message);
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}
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const {result} = res;
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assert(typeof result !== 'undefined');
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return {
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executable: result.executable,
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tokens: result.tokens,
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programId: new PublicKey(result.program_id),
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2018-10-17 09:35:24 -07:00
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loaderProgramId: new PublicKey(result.loader_program_id),
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2018-09-28 22:51:52 -07:00
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userdata: Buffer.from(result.userdata),
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2018-09-20 15:08:52 -07:00
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};
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}
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2018-08-24 09:05:23 -07:00
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/**
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* Confirm the transaction identified by the specified signature
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*/
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2018-08-23 10:52:48 -07:00
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async confirmTransaction(signature: TransactionSignature): Promise<boolean> {
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const unsafeRes = await this._rpcRequest(
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'confirmTransaction',
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[signature]
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);
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const res = ConfirmTransactionRpcResult(unsafeRes);
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if (res.error) {
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throw new Error(res.error.message);
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}
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assert(typeof res.result !== 'undefined');
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return res.result;
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}
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2018-09-26 19:16:17 -07:00
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/**
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* Fetch the current transaction count of the network
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*/
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async getSignatureStatus(signature: TransactionSignature): Promise<SignatureStatus> {
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const unsafeRes = await this._rpcRequest('getSignatureStatus', [signature]);
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const res = GetSignatureStatusRpcResult(unsafeRes);
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if (res.error) {
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throw new Error(res.error.message);
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}
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assert(typeof res.result !== 'undefined');
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return res.result;
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}
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2018-08-24 09:05:23 -07:00
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/**
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* Fetch the current transaction count of the network
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*/
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2018-08-23 10:52:48 -07:00
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async getTransactionCount(): Promise<number> {
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const unsafeRes = await this._rpcRequest('getTransactionCount', []);
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const res = GetTransactionCountRpcResult(unsafeRes);
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if (res.error) {
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throw new Error(res.error.message);
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}
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assert(typeof res.result !== 'undefined');
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return Number(res.result);
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}
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2018-08-24 09:05:23 -07:00
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/**
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* Fetch the identifier to the latest transaction on the network
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*/
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2018-08-23 10:52:48 -07:00
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async getLastId(): Promise<TransactionId> {
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const unsafeRes = await this._rpcRequest('getLastId', []);
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const res = GetLastId(unsafeRes);
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if (res.error) {
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throw new Error(res.error.message);
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}
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assert(typeof res.result !== 'undefined');
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return res.result;
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}
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2018-08-24 09:05:23 -07:00
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/**
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* Return the current network finality time in millliseconds
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*/
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2018-08-23 10:52:48 -07:00
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async getFinality(): Promise<number> {
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const unsafeRes = await this._rpcRequest('getFinality', []);
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const res = GetFinalityRpcResult(unsafeRes);
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if (res.error) {
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throw new Error(res.error.message);
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}
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assert(typeof res.result !== 'undefined');
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return Number(res.result);
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}
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2018-08-24 09:05:23 -07:00
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/**
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* Request an allocation of tokens to the specified account
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*/
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2018-09-12 17:41:20 -07:00
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async requestAirdrop(to: PublicKey, amount: number): Promise<TransactionSignature> {
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2018-09-30 18:42:45 -07:00
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const unsafeRes = await this._rpcRequest('requestAirdrop', [to.toBase58(), amount]);
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2018-08-23 16:39:52 -07:00
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const res = RequestAirdropRpcResult(unsafeRes);
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if (res.error) {
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throw new Error(res.error.message);
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}
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assert(typeof res.result !== 'undefined');
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2018-09-12 17:41:20 -07:00
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return res.result;
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2018-08-23 10:52:48 -07:00
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}
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2018-08-24 09:05:23 -07:00
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/**
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* Sign and send a transaction
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2018-08-24 09:05:23 -07:00
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*/
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2018-09-14 08:27:40 -07:00
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async sendTransaction(from: Account, transaction: Transaction): Promise<TransactionSignature> {
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for (;;) {
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2018-10-22 20:03:44 -07:00
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// Attempt to use the previous last id for up to 1 second
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const seconds = (new Date()).getSeconds();
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if ( (this._lastIdInfo.lastId != null) &&
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(this._lastIdInfo.seconds === seconds) ) {
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transaction.lastId = this._lastIdInfo.lastId;
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transaction.sign(from);
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if (!transaction.signature) {
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throw new Error('!signature'); // should never happen
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}
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// If the signature of this transaction has not been seen before with the
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// current lastId, all done.
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const signature = transaction.signature.toString();
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if (!this._lastIdInfo.transactionSignatures.includes(signature)) {
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this._lastIdInfo.transactionSignatures.push(signature);
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if (this._disableLastIdCaching) {
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this._lastIdInfo.seconds = -1;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
}
|
2018-10-22 15:31:56 -07:00
|
|
|
}
|
2018-10-22 20:03:44 -07:00
|
|
|
|
|
|
|
// Fetch a new last id
|
|
|
|
let attempts = 0;
|
|
|
|
for (;;) {
|
|
|
|
const lastId = await this.getLastId();
|
|
|
|
|
|
|
|
if (this._lastIdInfo.lastId != lastId) {
|
|
|
|
this._lastIdInfo = {
|
|
|
|
lastId,
|
|
|
|
seconds: (new Date()).getSeconds(),
|
|
|
|
transactionSignatures: [],
|
|
|
|
};
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
if (attempts === 8) {
|
|
|
|
throw new Error('Unable to obtain new last id');
|
|
|
|
}
|
|
|
|
await sleep(250);
|
|
|
|
++attempts;
|
2018-10-22 15:31:56 -07:00
|
|
|
}
|
|
|
|
}
|
2018-08-24 17:14:58 -07:00
|
|
|
|
2018-09-13 18:48:51 -07:00
|
|
|
const wireTransaction = transaction.serialize();
|
2018-08-24 17:14:58 -07:00
|
|
|
const unsafeRes = await this._rpcRequest('sendTransaction', [[...wireTransaction]]);
|
2018-08-23 20:10:30 -07:00
|
|
|
const res = SendTokensRpcResult(unsafeRes);
|
|
|
|
if (res.error) {
|
|
|
|
throw new Error(res.error.message);
|
|
|
|
}
|
|
|
|
assert(typeof res.result !== 'undefined');
|
|
|
|
assert(res.result);
|
|
|
|
return res.result;
|
2018-08-23 10:52:48 -07:00
|
|
|
}
|
|
|
|
}
|