i test web3js by geth,i build private net in local.i try to call getPastlog ,but return empty array.
const Web3 = require("web3");
// const web3 = new Web3(new Web3.providers.HttpProvider("https://rinkeby.infura.io/v3/770daaf97ee14e0aa77ac105bbcdd79f"));
const web3 = new Web3(new Web3.providers.HttpProvider("http://127.0.0.1:8545"));
web3.eth.getPastLogs({
address:"0xF81639558D54a03D6620c5bdb2f1C2e5c87736d0",
topics: ['0xdd970dd9b5bfe707922155b058a407655cb18288b807e2216442bca8ad83d6b5'] //topics:[web3.utils.sha3("adduintevent(uint256,uint256)")]
})
.then(console.log);
address and topics is right ,because i get them by getPastEvents
contract.getPastEvents('Log', {
// filter: {myIndexedParam: [20,23], myOtherIndexedParam: '0x123456789...'}, // Using an array means OR: e.g. 20 or 23
fromBlock: 0,
toBlock: 'latest'
}, function (error, events) {
console.log(events[0].raw);
});
===========result ==========
{
data: '0x00000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000000a54686520576f726c642100000000000000000000000000000000000000000000',
topics: [
'0xdd970dd9b5bfe707922155b058a407655cb18288b807e2216442bca8ad83d6b5'
]
}
so, i want to konw why i can't get anything by pastlog.Who can help me...
Related
Question: Why does navigating appear to change the readyState of the previous EventSources?
===============================================
Explanation: I'm working on a frontend (React) in which the user can enter a sequence of search queries (i.e. strings) and for each search query, my backend (Flask) will return a sequence of URLs. For each search query, I've decided to receive the server's response via an EventSource. Specifically, I first create a React state array of backendEventSources:
const [backendEventSources, setBackendEventSources] = useState([]);
Then I update the backendEventSources when a new prompt comes in:
useEffect(() => {
console.log('Inside useEffect')
// Take 0 for the newest prompt.
const newBackendEventSource = new EventSource(
`https://localhost:8080/generate?counter=${promptsResultsArray[0].counter}&prompt=${promptsResultsArray[0].prompt}`,
{withCredentials: false})
newBackendEventSource.addEventListener('open', () => {
console.log('SSE opened!');
});
newBackendEventSource.addEventListener('error', (e) => {
console.log('SSE error!');
console.error('Error: ', e);
});
newBackendEventSource.addEventListener('close', (e) => {
console.log('SSE closed!');
const data = JSON.parse(e.data);
console.log("close data: ", data);
newBackendEventSource.close();
});
newBackendEventSource.addEventListener('message', (e) => {
const data = JSON.parse(e.data);
console.log("message data: ", data);
// https://stackoverflow.com/a/47580775/4570472
const newPromptsResultsArray = [...promptsResultsArray];
// Since we preprend new results, we need to compute the right index from
// the counter with the equation: length - counter - 1.
// e.g., For counter 2 of a length 3 array, we want index 0.
// e.g., For counter 2 of a length 4 array, we want index 1.
// Recall, the counter uses 0-based indexing.
const index = newPromptsResultsArray.length - data.counter - 1
newPromptsResultsArray[index].URIs = [data.uri];
newPromptsResultsArray[index].isLoading = false;
setPromptsResultsArray(newPromptsResultsArray);
// Instantiating the element and setting the src property starts preloading the image.
// for (const newImgURI of newImgURIs) {
// const imageElement = new Image();
// imageElement.src = newImgURI;
// }
// setTimeout(() => {setImgURIs(newImgURIs)}, 8000);
});
// Add new backend event source to state for persistence.
setBackendEventSources(backendEventSources => [
newBackendEventSource,
...backendEventSources])
return () => {
newBackendEventSource.close();
};
}, [prompt]);
I use URL params for React navigation:
const navigateToGenerateResults = (promptString) => {
console.log('Adding new prompt results to promptsResultsArray');
// State doesn't update immediately (or even synchronously). To ensure we can immediately
// access the new values, we create a newPromptsResults.
// https://stackoverflow.com/a/62900445/4570472
const newPromptsResults = {
isLoading: true,
prompt: promptString,
counter: promptsResultsArray.length,
URIs: ["https://simtooreal-public.s3.amazonaws.com/white_background.png"]
}
// Prepend the new prompt to our promptsResultsArray
// https://stackoverflow.com/a/60792858/4570472
setPromptsResultsArray(promptsResultsArray => [
newPromptsResults, ...promptsResultsArray])
console.log('Setting prompt to: ' + newPromptsResults.prompt)
setPrompt(newPromptsResults.prompt)
console.log('Navigating from /generate to /generate with prompt: ' + newPromptsResults.prompt)
navigate(`/generate?counter=${newPromptsResults.counter}&prompt=${newPromptsResults.prompt}`)
}
However, I've discovered that as soon as I navigate from one URL to another, the previous EventSource's ready state switches from 0/1 to 2. Additionally, my newBackendEventSource.addEventListener('close' function is never triggered.
Why does navigating appear to change the readyState of the previous EventSources?
Hi I am building function to recursively "denest" a object of following interface:
export interface IUnit {
code: string
artifacts: IArtifact[]
units: IUnit[]
}
The idea is that I have a separate array that I returns with every immersion and after each return the returned array is "pushed" to local array and so on...
the function is as following:
const denestList = async (incomingUnit: IUnit): Promise<{ allUnits: IUnit[], allArtifacts: IArtifact[] }> => {
var units = [incomingUnit];
var artifacts = [...incomingUnit.artifacts];
//Array is full
console.log(unit.units)
//Array is empty
console.log(unit.units.length)
console.log([...unit.units])
console.log(Array.from(unit.units)?.length)
for (unit of incomingUnit.units) {
console.log(unit.code)
//Recursion happens here.
var result = await denestList(unit)
units.push(...result.allUnits)
artifacts.push(...result.allArtifacts)
}
return { allUnits: units, allArtifacts: artifacts }
}
The problem is that for (unit of incomingUnit.units) never happens. When I log unit.units it shows array full of IArtifact[], but when I run console.log(unit.units.length) it return 0.
Here is how to "denestList" function is called:
useEffect(() => {
asyncStart(unit)
}, []);
const asyncStart = async (mainUnit: IUnit) => {
var result = await denestList(mainUnit);
setAllUnits(result.allUnits)
setAllArtifacts(result.allArtifacts)
}
I would really appreciate any help. Thank you in advance
I am working on a music and I would like to know how to add a queue system to the command; I have been looking around for hours and not been able to find anything on it,
If anyone can help that would be great and I don't need a queue command but I do need to add a queue system so it would really help I will be checking back in an hour to see if anyone has given me or an idea or the answer to my problem
This is my code so far:
const Discord = require('discord.js');
const ytdl = require('ytdl-core');
const YoutubeSearcher = new QuickYtSearch({
YtApiKey: '',
});
module.exports={
name: 'play',
category: 'music',
description: 'Joins and plays the song',
aliases: ['p'],
usage: '.play <song name or URL>',
run: async(client, message, args)=>{
try{
if (message.member.voice.channel) {
let args = message.content.split(' ').slice(1).join(' ');
if (!args) {
const error = new Discord.MessageEmbed()
.setTitle(`🔴 Looks like there is an Issue!`)
.setColor(0x2f3136)
.setDescription(`You have to provide me at least, the name or the url.\n\nExample :
\`\`\`fix
.play <url>
OR
.play <name>\`\`\``)
return message.channel.send(error);
};
message.member.voice.channel.join()
.then(connection => {
if (YoutubeSearcher.isVideoUrl(args) === false) {
YoutubeSearcher.getVideo(args).then(video => {
const volume = { volume: 10 };
const dispatcher = connection.play(ytdl(video.url, { filter: 'audioonly' }, volume));
const play1 = new Discord.MessageEmbed()
.setTitle('Song info')
.setURL(video.url)
.setDescription(`Name: ${video.title}, By: ${video.channelTitle}`)
.setThumbnail(video.highThumbnail)
message.channel.send(play1);
dispatcher.on("finish", () => {
dispatcher.end();
message.reply('End of the song.');
message.member.guild.me.voice.channel.leave();
});
});
} else {
const volume = { volume: 10 };
const dispatcher = connection.play(ytdl(args, { filter: 'audioonly' }, volume));
message.reply('Now playing ' + args);
dispatcher.on("finish", () => {
dispatcher.end();
message.reply('End of the song.')
message.member.guild.me.voice.channel.leave();
});
};
});
} else {
message.reply('You need to join a voice channel.');
};
}catch(err) {
console.log(err)
return message.channel.send(`Error: ${err.message}`)
}
}
}
In theory you could use the queue data structure (the last element is taken out and when a new one is added it is added to the start) and in the queue hold the music that is requested to be played. This is how it might roughly look like:
client.on("message", (msg) => {
var arrOfMusic = [];
if(msg.content.startsWith("!queue")){
msg.channel.send(arrOfMusic.join(" , ")
}
if(msg.content.startsWith("!play")){
arrOfMusic.push(msg.content.slice(6))
// you don't need to play the music
}
// your code to play the end of the array all you do is play the last element you also //need to check once it is over and use pop to remove last element
if(msg.content.startsWith("clear")){
arrOfMusic = []
}
})
How can I pass an array as a query string parameter?
I've tried numerous ways including adding it to the path but i'm not able to pull the array on the back end.
If I hard code the array it works fine, but when I try to pass the array from my front end to the backend it does not work properly.
Can anyone point me in the right direction?
FrontEnd
function loadJob() {
return API.get("realtorPilot", "/myTable/ListJobs", {
'queryStringParameters': {
radius,
availableServices,
}
});
BackEnd
import * as dynamoDbLib from "./libs/dynamodb-lib";
import { success, failure } from "./libs/response-lib";
export async function main(event, context) {
const data = {
radius: event.queryStringParameters.radius,
availableServices: event.queryStringParameters.availableServices,
};
// These hold ExpressionAttributeValues
const zipcodes = {};
const services = {};
data.radius.forEach((zipcode, i) => {
zipcodes[`:zipcode${i}`] = zipcode;
});
data.availableServices.forEach((service, i) => {
services[`:services${i}`] = service;
});
// These hold FilterExpression attribute aliases
const zipcodex = Object.keys(zipcodes).toString();
const servicex = Object.keys(services).toString();
const params = {
TableName: "myTable",
IndexName: "zipCode-packageSelected-index",
FilterExpression: `zipCode IN (${zipcodex}) AND packageSelected IN (${servicex})`,
ExpressionAttributeValues : {...zipcodes, ...services},
};
try {
const result = await dynamoDbLib.call("scan", params);
// Return the matching list of items in response body
return success(result.Items);
} catch (e) {
return failure(e.message);
}
}
Pass a comma seperated string and split it in backend.
Example: https://example.com/apis/sample?radius=a,b,c,d&availableServices=x,y,z
And in the api defenition split the fields on comma.
const data = {
radius: event.queryStringParameters.radius.split(','),
availableServices: event.queryStringParameters.availableServices.split(',')
};
I want to assign snap.val() to this.Productslike this.Products= snap.val(); but this.Products is undefined in that scope.
Products: FirebaseListObservable<any>;
constructor(){
}
ionViewDidLoad(){
this.angularFire.database.list('/Products').$ref.orderByChild('uid')
.equalTo('NW1Kq4WB7ReUz2BNknYWML9nF133').on('child_added', function(snap){
console.log(snap.val().name);
//this.Products= snap.val();
});
}
I tried the following code when snap is returned ,but I receive this message -- No index defined for uid:
snap.forEach(SnapShot=>{
console.log(SnapShot.val().name)
My Firebase database:
"Products" : {
"-Kbx0i-TFeTyRbNZAZ_8" : {
"category" : "1",
"detail" : "xxxxx details",
"name" : "xxxxx",
"uid" : "NW1Kq4WB7ReUz2BNknYWML9nF133"
}
Please help. Thanks.
The directly answer the question you asked, you can use an ES6 arrow function:
let query = this.angularFire.database.list('/Products').$ref.orderByChild('uid')
.equalTo('NW1Kq4WB7ReUz2BNknYWML9nF133');
query.on('child_added', (snap) => this.Products= snap.val());
Or for ES5 compatibility, declare this as a variable:
let self = this;
let query = this.angularFire.database.list('/Products').$ref.orderByChild('uid')
.equalTo('NW1Kq4WB7ReUz2BNknYWML9nF133');
query.on('child_added', function(snap) {
self.Products= snap.val();
});
But in reality, this is an XY problem and you don't want what you think you want here.
What you've done is reimplement the list yourself, and defeat the entire purpose of AngularFire2, which handles all this synchronization on your behalf.
Additionally, you've mis-used child_added by assigning each record you get back (you get an array of results, not exactly one) to this.products, when you probably wanted to set this.products = [] and then use this.products.push(snap.val()) for each child_added invocation.
So what you really want here, is to use AngularFire's built-in queries and avoid this entire mess :)
this.products = af.database.list('/Products', {
query: {
orderByChild: 'uid',
equalTo: 'NW1Kq4WB7ReUz2BNknYWML9nF133'
}
});
I did it in this way:
import firebase from "firebase";
const firebaseConfig = {
your firebaseConfig...
};
let app = firebase.initializeApp(firebaseConfig);
let database = firebase.database();
export async function readFromFirebase(userId, key) {
const ref = database.ref("users/" + userId + "/" + key);
const snapshot = await ref.once("value");
return snapshot.val();
}
async function main() {
console.log(await readFromFirebase(109512127, "userName"));
}
main();