Creating dApps (Dont UpSmoke)

4 months ago

To Clarify we have only changed the name to coincide with the smoke name and updated the npm public repository. Full Credit goes to Nicholas C.

Are you a developer?

Creating dApps on Smoke is easier than ever before. We have forked the repository for steem-state and steem-transact and have made the necessary changes in order for this library to function on the Smoke Blockchain.

Big thanks to [email protected]

Introducing smoke-state and smoke-transact

**Please check out the readme below. **

smoke-state (Based on smoke-state)

Build decentralized apps on the Smoke blockchain with ease!

Installation

npm install smoke-state
and to use the companion project, smoke-transact,
npm install smoke-transact

Explanation

The Smoke blockchain is one of the fastest and most performant blockchains in existence with free and fast transactions. smoke-state, along with its companion project, smoke-transact makes it incredibly easy to create decentralized apps on the Smoke blockchain using soft consensus.

What is soft-consensus?

Most, if not all, blockchains focused on the creation of DApps today such as Ethereum are based around the idea of smart contracts. DApps running using smart contracts have their transactions verified by each node in the network. But this method is not the only way; not every node in the network has to verify every transaction for each DApp even if it doesn’t apply to them. When a transaction is not verified by every node in the network, but only the ones who use the DApp that the transaction applies to verify that transaction, soft-consensus occurs.

To use an analogy, the most adopted internet data transfer protocols (such as UDP) don’t try to do anything special with the data that is being sent. These protocols let the two users who are communicating verify, authenticate, etc their own data. Not everyone on the internet authenticates and verifies every data packet; it’s just not feasible.

Similarly, not everyone on a blockchain has to verify and authenticate every data packet. Ethereum is trying to introduce unneeded complexity to the problem of creating DApps by requiring that every user has to verify every transaction in every DApp, and it’s already hitting a scalabililty barrier partly because of it.

Anything that a smart contract can do can be done with soft-consensus, and soft-consensus can actually do much more. A soft consensus DApp is easy to hard fork without forking the main chain it runs on, and it has easy support for virtual operations (when a DApp creates a transaction that will execute after a certain amount of time), which Ethereum and most smart contract blockchains do not have, and will be implemented into the smoke-state package in v2.0.0.

smoke-state uses the custom_json operation type to create soft-consensus transactions. You can read more at the dev portal by searching up custom_json.

smoke-state

smoke-state is a framework for building fully decentralized DApps using soft-consensus with the >smoke blockchain. Using smoke-state you can define events that occur when a new transaction of a certain type is created, such as updating the state, displaying feedback for the user, etc. Using these events, you can build a fully decentralized DApp. Look below for an example tutorial.

smoke-state is a steem-stake clone on the Smoke Blockchain

Example

The following example will create a decentralized messaging app on the smoke blockchain with a CLI using only 28 lines of code! With your final result you will be able to send messages to a public chatroom through the smoke blockchain. First, install the dependencies we'll need and set up the project:

mkdir basic-messaging-app
cd basic-messaging-app
npm init
npm install smoke-state smoke-transact dsmoke

Then create index.js and we can start building! First we'll import our dependencies:

var steem = require('dsteem'); // This is our interface to the smoke blockchain.
var smokeState = require('smoke-state'); // This will allow us to build our DApp.
var smokeTransact = require('smoke-transact'); // This makes it easy to make transactions on the >smoke blockchain.
var readline = require('readline'); // For the CLI (command line interface).

Next is some setup for readline, which we will use to create our basic CLI:

var rl = readline.createInterface({
input: process.stdin,
output: process.stdout
})

Then we will create some variables for our username and private key on the smoke blockchain >(instead of public keys like Bitcoin and Ethereum, smoke uses usernames). We'll hardcode this for the sake of simplicity, but you could easily ask the user to input theirs. To complete this step you will have to have a smoke account (which can be done at https://smokeit.com).

const username = 'ned'; // Put your username here (without the @ sign).
const key = 'your-private-posting-key-here'; // Put your private posting key here.

Now we need to actually create our interface with the smoke blockchain. Like others like web3 (for Ethereum), smoke uses the dsmoke package to interface with the smoke blockchain. We'll provide this with a node to connect to (similar to how Infura works on Ethereum) and to get the blockchain data from:

var client = new steem.Client('https://api.smoke.io'); // One good node to use. 

Then we'll get the latest block to use as where we'll start processing blocks and transactions from:

client.database.getDynamicGlobalProperties().then(function(result) {

Then actually create the smoke-state instance. This method uses the arguments:

client: the dsmoke client to get transactions from,

smoke: a dsmoke instance,

startingBlock: which block to start at when processing blocks and transactions,

processSpeed: the amount of milliseconds to wait before getting the next block (when not fully caught up to the latest block),

prefix: the name of your DApp. This prefix is at the beginning of every transaction created for your DApp and ensures that no other DApps will use the same transaction ids as yours. Make sure to make this unique for your DApp! For example, smoke Monsters, a highly successful smoke DApp, has the prefix sm_. We will use the prefix basic_messaging_app_ for our app.

mode: whether to stream blocks as latest or irreversible. Irreversible is slower but much more secure, while latest is faster but can be vulnerable. We will use latest because our messaging app doesn't have to be highly secure, but for most DApps irreversible will be better (irreversible would be similar to waiting for 6 blocks in Bitcoin before confirming a transaction).

And we will create it like so, using the result from retreiving the latest block's number:

var processor = steemState(client, steem, result.head_block_number, 100, 'basic_messaging_app_', 'latest');

Next we will define what will happen when someone creates a message transaction, which will result in a display of that message to the user. After that, we will start the processor:

processor.on('message', function(json, from) {
console.log(from, 'says:', json.message);
});
processor.start();
});              // Close the function we started before.

Finally we handle user input and when our DApp actually creates these message transactions. We'll first initialize our transactor by using the smoke-transact package:

var transactor = smokeTransact(client, smoke, 'basic_messaging_app_');

Then we state that when the user creates a new line, intending to send a message, they will create a message transaction:

rl.on('line', function(input) {
 transactor.json(username, key, 'message', {
   message: input
 }, function(err, result) {
   if(err) {
     console.error(err);
   }
 });
});

The json function (used for creating a customJSON transaction) has 5 arguments:

username: username of the user to send a transaction from,

key: the private key of the above user, used to sign the transaction,

id: the id of the transaction to create,

json: the json of the transaction to create; in this case we create a small object which contains the message,

callback: the function to call once the transaction is created (or an error occurs).


Here is the full code:

var steem = require('dsteem');
var smokeState = require('smoke-state');
var smokeTransact = require('smoke-transact');
var readline = require('readline');

const rl = readline.createInterface({
 input: process.stdin,
 output: process.stdout
});

var username = 'your_username_goes_here';
var key = 'your_private_posting_key_goes_here';



var client = new steem.Client('https://api.smoke.io');
client.database.getDynamicGlobalProperties().then(function(result) {
 var processor = smokeState(client, smoke, result.head_block_number, 100, 'basic_messaging_app_');
 processor.on('message', function(json, from) {
 console.log(from, 'says:', json.message);
 });
 processor.start();
});

var transactor = smokeTransact(client, smoke, 'basic_messaging_app_');
rl.on('line', function(input) {
 transactor.json(username, key, 'message', {
   message: input
 }, function(err, result) {
   if(err) {
     console.error(err);
   }
 });
});

If you run your code using node index.js you should get a terminal wher you can enter in text. Simply type in a message, press enter, and in a few moments your message will show up. Try running multiple instances at the same time to see that it is actually running on a blockchain. You can also look from smoked.com/@your_username_here (a smoke block explorer) to see your recent transactions. You should see a few transactions titled custom_json which have the json data of the transactions you created while testing the messaging app.

Next

Before you start developing your own app, learn how to create a token using smoke-state and learn about design patterns to use when using smoke-state, read more about building decentralized apps using soft consensus, and read the documentation on the steem-state wiki.

If you have any questions, suggestions, problems, or want advice about incorporating soft-consensus into your project, email me at [email protected]
Original Source


If you would like to participate in development of this application please fork our repository and make pull requests when finished.

For those of you who are excited about building your first Smoke dApp please visit our Github and clone the repo.

If you have enjoyed this tutorial please keep reading

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Can you please explain which changes have been made to work with Smoke, other than the updated Readme.md and setting yourself as author?

Yes, I spotted the URL change for the node. But other than those few edits, I didn’t see anything which isn’t Nicholas D. work.

IMHO rewards should be for Nicholas-D, at the very least until the fork actually add value beyond authorship change and few edits in the readme.md.

This is IMHO not correct witness behavior. If this were GPL scene you would be vilified very badly over this.

·

As stated I have only changed the names and updated npm with smoke-state and have given full credit to Nicholas D. multiple times in the post. In no way am I claiming owner ownership. If you check my github you will see the source cited multiple times. Also this is MIT licensed and follows the following set of rules.

MIT License

Copyright (c) 2018 Nicholas C

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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Yes but I think you should then decline rewards.

I know this fits under the MIT license but rewards are a fickle thing which at times can backfire too. Especially as chain witness.

What's the point of this?

custom_json is tx only, there is no state and rules!

You could simply do a custom_json tx using smoke-js. I'm unsure why you think this 150 lines of code 'library' is a useful start to dapp development on Smoke?

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I am only bringing software over to the blockchain for people to use. I don't see anyone else doing it.

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And I'm only trying to see the use for this..?

There are others actually. but they are building things and don't announce them until they ready.

I know of 3 Dapps being built exclusively for Smoke by witnesses using the smoke-js that have not yet been announced.

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Well that's fantastic but I share everything. I don't need to wait for some big fancy announcement to happen for my code to be released. IMO Open Source is a community driven ideology built for and by programmers that want to make a difference. I mean, I could have also just waited to announce HashKings when it was ready but then I wouldn't have all the community support I'm getting.

Maybe this javascript is something you don't need to use but I bet there are people out there that would like to use it considering you cant find any other information about how to build apps on smoke, that I know of. I'm also not blogging to defend myself here's some information take it or leave it. Nothing more nothing less.

I'm just trying to contribute which is seeming harder and harder to do every day.

I like it man. :) Thanks for sharing the code.

Hey I just quickly browser over this post. I'd like to build a better block explorer for smoke.io, could we chat on discord some time? I'm thinking of just using steemdb's code which is on github, I just might need some help in modifying the code to work with the smoket network.

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Yes absolutely, hit me up on discord please https://discord.gg/X6n7znf , I'm Cannabis King in the Server