Hummingbot Weekly Developer, 14 Dec 2022

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From YouTube: Weekly Developer Call 018 | 14 December 2022

Description

Meeting Info:
- Schedule:14 December 2022 : 11:00 AM EST / 3:00 PM UTC / 11:00 PM HKT
- Duration: 60 minutes
- Location: YouTube Livestream

Agenda:
- Review Open Issues of Bounties Board
- Mini-Lesson: Script CEX + Gateway Teardowns
- Community Q&As

A

Okay, I'm not sure whether it's different at all.

A

In terribly maybe it's different click already.

B

No I want to end it so.

C

Yes, sorry I can see my screen.

D

C

Yeah it's working I can see my screen.

D

The community called chat on the audio.

C

A

But it's not displaying yet we call it on.

D

B

Okay, okay, hopefully everyone can see my screen.

C

It's working: okay, perfect, okay,.

B

We will wait for some people to join and then we can.

E

E

I'll just check the number of people here.

C

Okay, we can start.

F

B

I hope the audio is clear, I hope everyone is here and listening. um Hello Fred is saying hi, so welcome to the weekly developer. Call the this week we're going to have a mini lesson uh talking about the uh the script sex and plus Gateway teardown. We are talking about how to use Gateway with with scripts, because it's a bit uh different than the normal scripts. We'll do we'll be doing a comparison between the two of them and then we will um run Gateway script uh and and watch it watch it do the math.

B

So basically, the the the the essential operation that you need to know is that this scripts are uh synchronous and the Gateway uses async functions. This is what where the complication for the um for the uh Gateway scripts comes from, you will need a workaround to execute the Gateway scripts and you will need to create the logic inside a different function. I will be walking you through a simple example where you, where you'll, be able to use the Gateway in a script.

B

um First of all, you you need to create the async logic, put it inside um like uh uh anything on tick and then call the async contact in in the in the on in the actual ontake using safe, ensure future, and then you need to get uh to add a check uh on the ongoing test.

B

uh Here is the first example, so the this is a DCA example. This is a very simple uh script to buy, um uh to buy on uh what the time is uh done. So you, when the time interval is done so you'll. uh This is the centralized exchange script. This is using binance paper trade.

B

As you can see here, the logic of the script is inside of the antique and uh like when you run the script. This is the function that is going to run uh for it. This is a synchronous function. So if you want to transform this into any like a Gateway script, you would need to uh add another function.

B

Just like this, so you need to add an async task function or call it anything just as long as it's an async function, and then you will be able to uh do call like Gateway calls on on this and then you'll be able to execute the Gateway trades as well as as we can see here.

B

So what happens here is that uh I created this a sync task function and then put all of the logic of my script inside of this function, and then I go to the ontake function here and I I call the async task inside of safe, ensure future save ensure future. What it does is um it allows you to run async functions inside of synchronous function.

B

Basically uh also one more thing is that if you don't add a check for the ongoing task, you will uh you will be running the async test multiple times before the um before.

F

B

Actual script finished running before the logic finished running, so here I set the logic to true and then um like once once that I make sure that the task is done and there is no more uh orders. I I will set back to false, and then we will, you will be able to uh you'll, be able to go to the next trade basic uh here. I also have an async uh like I think script on an on a centralized exchange. This is not needed.

B

This is just an example that you use to uh like the to know well like how to transform my script into a Gateway script or how to use the um how to use the uh the Gateway uh asynchronous functions inside of uh on the side of the current version of scripts. So this is the this is the actual file.

B

This is the actual script here you can see most of the logic for canceling the orders, the also and then placing the orders is inside the ons, the ontake function, and if you go to the async version of the same script, I have moved everything inside of the um async task function again and then calling the function inside of uh async uh task.

B

This is um uh this is basically the like what you need to do to get the to get the script to work with the Gateway, we're going to run few examples here and then we're going to move to uh to uh asking questions and and answering questions. So the first example I'm going to run is the the first ontake, the the first async script, which is the it's called async Script here. So it's it's a simple bmm, but it just turned a AC.

A

A

B

Script is creating orders for usdt on binance paper trade, and you can see that like async and no no can work normally with um with the centralized exchanges based script as well. This is the purpose of this script. I'm going to check the status here, and you can see that we have orders so I will just stop this script and then I will go again to the decent, like the DCA example for the uh for the Gateway example.

B

So this is this one uses ethereum girly. So if we run this script,.

B

You will have to wait here for the connector to be ready and if you haven't approved the token already, you will have to wait for approvals as well. This might take sometimes like two or three minutes. You will get the the price here. I already set the price here to a random price, because the price quote on girly was failing. But if you run this on the uh on mainnet it will it will work with uh no problem.

B

uh So you, you will see here that you have said to create order with uh like the the price and the amount as the show need, and the order here has uh has failed. But the order has been sent to the Gateway. You can see that it failed because of uh provider. Gas error like not being able to get the uh the price from uh the girl in it.

F

E

The screen resolution is low I'm, going to check it right now.

E

Yeah, just a second sorry for that.

B

I just heard that the screen resolution is low, that probably you will not have been able to see the code here. This is coming soon to the development Branch I'll be creating a VR for like your gateway script. Examples.

E

But also we need to fix this resolution issue.

C

E

Okay, you can see the screen we.

B

Will just continue with the um with the explanation and then just receive questions.

F

B

Okay, so this is the this is the DC example, as I said so, I'll just be cap here. Hopefully, everyone can see my screen and uh I can hear my voice. My voice very well so, as I said like to transform any of these scripts into a script that uses Gateway, you need to create an async function.

B

Put all of the logic of the script inside of this async function here and then add a check for like the ongoing task, because since you're using asynchronous, the task might not finish in the one second for the untick, and you don't want to be running the same task again and again and again so add a check for the ongoing task and then call the function inside of safe, ensure future to to basically execute the script.

B

This is uh this is a the simple way of getting a script to become like uh to use the the Gateway and also you you will be able to have like the, for example, the simple pmm script example. You will have an async version of it that you will uh like you, you can at least get the logic of. What's Happening from it?

B

um Also all of the functions that you will be using for uni so, for example, are available in the Gateway evm mm file. So, for example, some of the functions that are available for uh centralized exchanges are not available here. Like they get price, you will not. You will not have a get price uh full function and you will only like have it through the get code price function, so uh all of them are available in the Gateway. Evm am class.

B

uh That's how you will be able to get the price for the you either use gate code price or you you can use, get uh order place. The two functions from the similar, uh basically similar, um like a return. You'll you'll get the price for the token that you for the pair that you want and I think that that sums it up. If you, uh if you have any questions, I think I've been, might have been too fast in explaining this, and if you have any questions, I'll gladly uh help you with.

B

I will be looking for questions in the either in the YouTube chat or in the community chat.

B

For those who don't know the questions, uh the questions uh like you can ask the questions in the community called chat in the in the Discord. So so we have a question full of entity here. When will the Gateway script be available to the community? So I'll I'll be pushing two examples, uh hopefully in the next in within this uh the next release.

B

So we will have a few examples of the uh of Gateway scripts and you will be able to copy them, use them and play around with them and uh or create other scripts as well that that uses the Gateway I think there is a lot of opportunities for uh for, um like a very profitable scripts using uh the Gateway and you can.

B

You can create scripts that use both um because the async version works with uh with the with the centralized exchanger as well. You can use the the async scripts to create like cross Exchange um strategies you can use like for arbitrary strategies. You can use it for many things and across the axes and services. At the same time, so you'll there's a lot of opportunities. There.

B

You have a question for lazy days. uh What is the async function uh now, for example, right.

D

Now, there's no like.

B

This is not available in the uh in in the code base, but uh you you can see it here. I just want to explain this and uh like give a heads up to the community before we uh before we like I, add this to the code base, so here you'll have the async uh using function.

B

This is the DCA example turned into a Gateway example, and you will be able to see here that, um like instead of putting all of the logic inside of the untick, you will put the logic inside of an async function here and.

F

B

Like all the async function using safe, ensure Futures, this is the workaround that you need to be able to use Gateway Scripts.

E

Many more questions, I'm looking for.

E

No, no, it wasn't it.

B

Is not published yet this is a.

B

um This is the first example, and we are the discussing it in the community and preparing a full example like a few examples that at least two and uh we'll be publishing them very soon.

E

Any more questions in the chat here or on the YouTube chat.

F

B

Yes, it does and it's the it's the same structure as the other script. You can also use the uh the events and the um all of the other uh methods available for the scripts. You can use them within the async script and they will work as well just as well in the async ones.

B

You can see it as well in this in this example. Here you can use all of the functions you want.

E

So, yes, it inherits from script strategy based all of them.

B

Any more questions regarding the Gateway scripts and then take the little um like for any question related to when this will be coming. It will be very, it will be very soon. Hopefully,.

B

So I'll be waiting for more question here and if it is uh like any questions that you have afterwards, you can post them in the developers channels.

E

And I would be canceling them.

E

B

Are the same as the uh for the last two or three weeks and I? Think it's not the point that we go through them.

E

B

We will feel free to check the bonds reward and choose a bounty to work on.

B

B

Thank you very much for coming to the weekly developer call, and hopefully this this mini lesson has been useful, um I'm, looking forward to see what you create with the Gateway scripts as soon as we release.

F