seele-sdk-javascript
Version:
seele's javascript sdk
383 lines (362 loc) • 13.1 kB
JavaScript
"use strict";
const SEELE_SUBSCRIPTION_TOPICS
= {"newBlockHeaders":"newBlockHeaders",
"transaction":"transaction",
"debt" : "debt",
"event":"event"} ;
const seele = require("./rpc.js");
const utils = require("./key");
const EventEmitter = require("eventemitter3")
const web3abi = require("web3-eth-abi")
/**@class */
class Subscription {
constructor(options) {
this.topicList = SEELE_SUBSCRIPTION_TOPICS;
this.id = new Date().getTime();
this.host = options.host;
this.topics = {};
}
sub(topicName,topicOptions){
console.log("call sub",topicName);
if ( SEELE_SUBSCRIPTION_TOPICS[topicName] == undefined) {
console.log("invalid topic name")
return
}
let eventEmitter = new EventEmitter();
if (topicName == SEELE_SUBSCRIPTION_TOPICS.newBlockHeaders){
if (this.topics[topicName]){
clearInterval(this.topics[topicName])
}
let subId = listenBlockHeaders(this.host,topicOptions,eventEmitter)
this.topics[topicName] = subId
}else if (topicName == SEELE_SUBSCRIPTION_TOPICS.event){
if (this.topics[topicName]){
clearInterval(this.topics[topicName])
}
let subId = listenLogs(this.host,topicOptions,eventEmitter)
if (typeof(subId)=="string"){
console.log("sub topic failed");
}else{
this.topics[topicName] = subId
}
}else if (topicName ==SEELE_SUBSCRIPTION_TOPICS.transaction){
if (this.topics[topicName]){
clearInterval(this.topics[topicName])
}
let subId = listenTransaction(this.host,topicOptions,eventEmitter)
if (typeof(subId)=="string"){
console.log("sub topic failed");
}else{
this.topics[topicName] = subId
}
}else if (topicName ==SEELE_SUBSCRIPTION_TOPICS.debt){
if (this.topics[topicName]){
clearInterval(this.topics[topicName])
}
let subId = listenDebt(this.host,topicOptions,eventEmitter)
if (typeof(subId)=="string"){
console.log("sub topic failed");
}else{
this.topics[topicName] = subId
}
}
return eventEmitter;
}
unsub(topicName){
if (this.topics[topicName]){
clearInterval(this.topics[topicName]);
delete this.topics[topicName];
return true;
}else if (SEELE_SUBSCRIPTION_TOPICS[topicName]==undefined) {
console.log("topic name invalid:"+topicName);
return false;
}else{
console.log("topic not subscribed:"+topicName);
return false;
}
}
}
let listenBlockHeaders = function(host,options,eventEmitter){
//options.startHeight: start listen from this block height
let startHeight = -1;
if (options != undefined && options.startHeight != undefined) {
startHeight = options.startHeight;
}
let blockHeight = startHeight
return setInterval(function () {
let seeleJSONRPC = new seele(host);
try {
let result = seeleJSONRPC.sendSync("getBlock", '', blockHeight, false)
if (result.header!=undefined && result.header.Height!=undefined){
eventEmitter.emit('data',result.header);
blockHeight = result.header.Height + 1;
}else{
eventEmitter.emit('error',"no header info")
}
}catch (e) {
eventEmitter.emit('error',e.toString())
}
},15*1000)
}
let validateLogsTopicParams = function (host,options){
if (options == undefined) {
return new Error("option is undefined");
}
let contractAddress = options.contractAddress;
if (contractAddress == undefined) {
return new Error("option contractAddress is undefined");
}
let abiJSON = options.abiJSON;
if (abiJSON == undefined) {
return new Error("option abiJSON is undefined");
}
let eventName = options.eventName;
if (eventName == undefined) {
return new Error("option eventName is undefined");
}
let startHeight = -1;
let seeleJSONRPC = new seele(host);
if (options.startHeight != undefined) {
startHeight = options.startHeight;
}else{
//get current block height as startHeight
let retryTimes = 0;
do{
try{
let result = seeleJSONRPC.sendSync("getBlock","",-1,false);
if (result.header!=undefined && result.header.Height!=undefined){
options.startHeight = result.header.Height;
startHeight = options.startHeight
}
}catch (e) {
retryTimes++;
if (retryTimes>=10){
return e;
}
}
}while(startHeight==-1);
}
return null;
}
let listenLogs = function (host,options,eventEmitter) {
let err = validateLogsTopicParams(host,options);
if (err != null && err != ""){
return err.toString();
}
let blockHeight = options.startHeight;
let seeleJSONRPC = new seele(host);
return setInterval(function () {
try {
let result = seeleJSONRPC.sendSync("getLogs", blockHeight, options.contractAddress, options.abiJSON, options.eventName)
if (result != undefined && result.length > 0){
console.log(result);
eventEmitter.emit('data',result);
}
blockHeight = blockHeight + 1;
}catch (e) {
eventEmitter.emit('error',e.toString())
}
},1*1000)
}
let validateTransactionTopicParams = function (host,options){
if (options == undefined) {
return new Error("option is undefined");
}
let from = options.from;
let to = options.to;
let account = options.account;
if (from != undefined && !utils.valid(from)){
return new Error("option from address is invalid");
}
if (to != undefined && !utils.valid(to)){
return new Error("option to address is invalid");
}
if (account != undefined && !utils.valid(account)){
return new Error("option to address is invalid");
}
let txhash = options.txhash;
if (txhash == undefined && from == undefined && to ==undefined && account == undefined){
return new Error("subscription transaction should define at least one option:from, to, or txhash, account");
}
let startHeight = -1;
let seeleJSONRPC = new seele(host);
if (options.startHeight != undefined) {
startHeight = options.startHeight;
}else{
//get current block height as startHeight
let retryTimes = 0;
do{
try{
let result = seeleJSONRPC.sendSync("getBlock",host,"",-1,false);
if (result.header!=undefined && result.header.Height!=undefined){
options.startHeight = result.header.Height;
startHeight = options.startHeight
}
}catch (e) {
retryTimes++;
if (retryTimes>=10){
return e;
}
}
}while(startHeight==-1);
}
return null;
}
let listenTransaction = function(host, options, eventEmitter) {
let err = validateTransactionTopicParams(host,options);
if (err != null && err != ""){
return err.toString();
}
let blockHeight = options.startHeight;
let seeleJSONRPC = new seele(host);
return setInterval(function () {
try {
console.log("blockHeight:"+blockHeight);
let result = seeleJSONRPC.sendSync("getBlockByHeight", blockHeight, true)
if (result != undefined ){
// first check txhash
if (options.txhash != undefined){
let tx = filterTxhashFromBlock(result,options.txhash);
if(tx != "") {
eventEmitter.emit('data',tx);
}
}else if(options.account != undefined){
// second check account ( from or to ), txs or debts
let txs = filterAccountTxsFromBlock(result,options.account);
if(txs.length > 0) {
eventEmitter.emit('data',result);
}
}else{
// third check from or to
let txs = filterAddressTxsFromBlock(result,options.from,options.to);
if(txs.length > 0) {
eventEmitter.emit('data',result);
}
}
}
blockHeight = blockHeight + 1;
}catch (e) {
eventEmitter.emit('error',e.toString())
}
},5*1000)
}
let validateDebtTopicParams = function (host,options){
if (options == undefined) {
return new Error("option is undefined");
}
let account = options.account;
if (account != undefined && !utils.valid(account)){
return new Error("option to address is invalid");
}
let debthash = options.debthash;
if (debthash == undefined && account == undefined){
return new Error("subscription debt should define at least one option:debthash, account");
}
let startHeight = -1;
let seeleJSONRPC = new seele(host,2);
if (options.startHeight != undefined) {
startHeight = options.startHeight;
}else{
//get current block height as startHeight
let retryTimes = 0;
do{
try{
let result = seeleJSONRPC.sendSync("getBlock",host,"",-1,false);
if (result.header!=undefined && result.header.Height!=undefined){
options.startHeight = result.header.Height;
startHeight = options.startHeight
}
}catch (e) {
retryTimes++;
if (retryTimes>=10){
return e;
}
}
}while(startHeight==-1);
}
return null;
}
let listenDebt = function(host, options, eventEmitter) {
let err = validateDebtTopicParams(host,options);
if (err != null && err != ""){
return err.toString();
}
let blockHeight = options.startHeight;
let seeleJSONRPC = new seele(host);
return setInterval(function () {
try {
let result = seeleJSONRPC.sendSync("getBlockByHeight", blockHeight, true)
if (result != undefined ){
// first check txhash
if (options.debthash != undefined){
let debt = filterDebthashFromBlock(result,options.debthash);
if(debt != "") {
eventEmitter.emit('data',debt);
}
}else if(options.account != undefined){
// second check account
let debts = filterAccountDebtsFromBlock(result,options.account);
if(debts.length > 0) {
eventEmitter.emit('data',debts);
}
}
}
blockHeight = blockHeight + 1;
}catch (e) {
eventEmitter.emit('error',e.toString())
}
},5*1000)
}
function filterTxhashFromBlock(block,txhash){
let txs = block.transactions;
for (var i=0; i< txs.length; i++){
if(txs[i].hash==txhash){
return txs[i];
}
}
return "";
}
function filterAccountTxsFromBlock(block,account){
let txs = block.transactions;
let retTxs = [];
for (var i=0; i< txs.length; i++){
if(txs[i].from==account || txs[i].to==account){
retTxs.push(txs[i]);
}
}
return retTxs;
}
function filterAddressTxsFromBlock(block,from,to) {
let txs = block.transactions;
let retTxs = [];
for (var i=0; i< txs.length; i++){
if(from != undefined && to == undefined && txs[i].from==from){ // only filter from
retTxs.push(txs[i]);
}else if (from == undefined && to != undefined && txs[i].to==to){ // only filter to
retTxs.push(txs[i]);
}else if (from != undefined && to != undefined && txs[i].from==from && txs[i].to==to){
retTxs.push(txs[i]);
} // filter both from and to
}
return retTxs;
}
function filterDebthashFromBlock(block,debthash){
let debts = block.debts;
for (var i=0; i< debts.length; i++){
if(debts[i].Hash==debthash){
return debts[i];
}
}
return "";
}
function filterAccountDebtsFromBlock(block,account){
let debts = block.debts;
let retDebts = [];
for (var i=0; i< debts.length; i++){
if(debts[i].Data.Account==account){
retDebts.push(debts[i]);
}
}
return retDebts;
}
module.exports = Subscription;