NEAR Курс Rust на NEAR (RU), 28 Aug 2021

Previous Meeting

Next Meeting

⏯

youtube image

►

From YouTube: Создание смарт-контракта на стриме (Курс Rust на NEAR)

Description

На этом стриме мы с Евгением Кузяковым создаем контракт для Conway's Game of Life и отвечаем на вопросы по предыдущим лекциям.

Все видео курса https://www.youtube.com/playlist?list=PL9tzQn_TEuFUakOn-IY9cDQL2ztNzZunh
Совместный курс NEAR & 4ire Labs

Код https://github.com/zavodil/game-of-life

Follow the latest from NEAR Protocol on:
Website: https://near.org/
Discord: https://near.chat/
Blog: https://near.org/blog/
Twitter: https://twitter.com/NEARProtocol
GitHub: https://github.com/near https://github.com/nearprotocol
#Blockchain #FutureIsNEAR #NEAR #nearprotocol #rust #wasm #assemblyscript #раст

A

Hello: everyone again, my name is vadim and today evgeny is presenting the world protocol today, 5 programming, lessons once for the world and 15 final series in general. Once for the blockchain of our big course under the video there will be all links to previous lessons,. So thanks evgeny for wanting to ask us today, because I never began to answer all the questions,, then somehow in the chats. They also promised to answer, did not answer,, so I hope. Today we will all make up for all previous debts,.

A

So briefly, who is Evgeny here? He is from us gold medal. 2008. This champion worked google facebook, then I switched to blockchain,, please love and favor,. So evgeny will answer all the questions that you have left,. He is one of those people who became more part of the runtime and not r,.

A

So all the tricky questions please, so I’ll, probably first tell you about the hackathon that we start tomorrow will pass before On September, 12,, 2, hours, I will send the link to the chat,, so you can apply register either as a team or as a participant,.

A

Many different tasks are waiting for you that have been prepared by Nir partners and the employees themselves,, not a total prize fund of a million dollars in prizes and funding, and in general, all the opportunities to translate the skills that you have received now at school, into a real application, get the first advice from mentors and where he brewed the world and plus you have a chance to get prizes. If you want to find a team and specially here tools, click here on fanta artem, this site will open.

A

You can create your gekko while he logs in create your profile or you are looking for. Well, apparently, you will be looking for a team. If you submit a project,, you want to find an employee,. You can also create a profile for a team to make positions that you are interested in,. Let's say if you know well and oh, you can find developer smart contracts here, there are not so few of them.

A

There are people who are ready to write the code of this team who posted plus we have such a promotional campaign activity is a small promotional action,, which means if someone makes their profile here and then zaz marks the works of cotton,. They will get unique oils,, which means that about the experience of evgeny,, he is on the youtube channel new york, weekly heading life, contract review- and here you see a lot of projects. I have already made reviews, that is, there. The project is directly taken to open its code,.

A

They are looking for some take and stylish problems, and directly. It is all done to grow on the world, as if for sure it will be interesting to you,. Today, in the same version, we can analyze some projects that we developed earlier I’m there or a genius or some separate pre that suddenly interest you,. So please write. If you want to do some analysis here, that is,, it will probably be a duplication of information that we have to chew on the playlist,, but she did it with you in Russian directly.

A

Under your interests, we have the ability to disassemble both the elevator and the project. For my night, it is possible to pick up the farm q shore of paws that evgeny wrote, that is,. It is such an interesting game with elements of earning from either there is a third option, well, or we can combine it like. You have an option,. We can make a small project right. Now, for example, game of life,. Evgeny has already prepared a template to write this game of life for training,. We can’t do it,.

A

We probably won’t have time to do it right today fly but it’s like we can do it later until I write a smart contract, so I ’ll be very happy. If you leave what kind of chat that he’s interested in nfc farm or right away, write code or immediately come to questions,, we probably planned to write a game of life if it interests you and maybe disassemble. A pair of club is a very interesting application.

A

That fits very well on the blockchain and it was not written earlier because others do not provide an opportunity at all which gave the world.

A

Until I see these comments, ode.

B

Game of life, the idea is that it is possible to the contract is to write the transition itself,. The previous one stands for the next one,, and just one of the people will have to pay for this transaction. The gas that later made this transition,, but everyone will be able to see how it happens, you can.

C

Tell how the mechanics are going.

A

Super well, voices have been distributed,, so let's probably go according to plan before. Maybe we can.

B

Start and if it's interesting, you can stop along the way, just ask a question passed with barry club, but we discussed this video a lot,. The principle is told well,, it's just in English, after.

D

C

A

Asking questions right along the way, then evgeniy, please send you to the trance. I will rest today found an employee myself. Decentralization see.

B

Just think about how to make it not too loud on my keyboard, so if it is loud and try to move the microphone, this is the standard template with which I usually start contracts, or most often I have some other pieces or copy to start what we use. We use the standard for our game. It's children still use version.

B

31, I.e. not 4, contract standard, allows you to add a fan. The.

C

B

C

Gostrey on.

B

B

Screw it is a library that allows with long hours of work on basically, these two libraries, rather, everything is not needed, so we will use just standard things,, I.

A

Can kill you quickly,, so he asks romankov if all like a man to create a template project party pack, organ we have npx create not a slave and I will throw off the link. You can create it. Npx space, creed, minus ., world ., art lab. Then you can specify the name of the project, the language that you want to specify 1 3 as the boss and the samba script and the frontend that you want the reaction of vanilla, james and so on,.

A

We don’t push it much because I’m redoing it, that’s why the enemy probably didn’t insert the most. The best scenario is just to clone the current ones attach an example and start writing them. Now I will send the link to the chat.

B

Yes, I don't really like to use it either, because there are too many blade boilies, which I don't use. This place leak jason, which allow to compile contracts, I.e. I prefer to use the standard one, the build, in principle,, to give it can also be improved to use docker, that is,. It would be nice if another of the same file was that combined contracts as a standard.

B

Idea is that now, when we compile a contract, we use some local data from my current machine, for example, the path to a file, and when we use docker, then it isolates with ice and on standardization, it doesn’t matter on which machine the file is compiled, that is, there may even be different operating systems as a result,, we will always generate the same contract,. This allows you to check that the code really corresponds to some kind of binary file.

B

So what about the template? Next, I.e. we have initialize the memory contract which they can default, which is called the contract and the constructor is empty. So far, now a bit of what we want to achieve, and there are more tests, I.e. I, have written so far only a test that allows you to check that the contract is being created.

B

What we want to do with us, if you cleave this field,.

B

Where there are cells, they have two states live and non-living on an empty cell as a result of a standard convoy with game of life. This is when we have if the cell is empty and in a neighborhood of two neighbors it becomes alive or if the cell is alive and her they, if not 3 neighbors, will remain alive. If the cage is alive. There touched two neighbors: the country becomes Xia, please, and in another case,, the cell dies, it’s important. For me whether you set it.

B

Or not, in fact, it’s about games and.

B

Just need to write an algorithm that allows you to move from one field to another, that is, for example,. We have let the field be four by four.

C

B

B

Next stage will be because there are.

B

3 living cells out of eight neighboring cells,, this cell will become alive,. This cell will die because there is only one of them, well,. They will all remain alive,. It turns out, because there were two neighbors of each and all this state now does not go anywhere game of life, stable state.

B

What we ’ll write today for the contract, first, you just need to write a transition from one state to another and then later in the tests, we can check how it works, that is, we can simulate tests and draw exactly what happens in the console.

C

B

How is it before, that is, firstly,, we need to decide how it can be stored,, but from this idea, create a new one with for example, name, the structure in which we will store the cells, that is, one of the options would be to set the size of the field and.

B

Simply store it as an array and spinal.

C

Jews, how many,.

B

But this will not be very efficient, because each cell has two states in total,. You can use bits instead of bytes.

B

Plus,, we should think about how we will transfer this to the client, there is,, since it is a cm from the contract,. We sometimes need to return a field,. One of the options is just to create.

B

Then our field can be saved as 8 bits.

D

B

Be one to do, that is, it will be 108 cells, which will be from left to right.

B

With a few lines,, then we can just powder follows on us. There will be a constant width and height, I.

B

Remember it will be suppose 120 we can.

B

Process it more in the contract or not whether we have enough gas.

A

Can we clarify here you have chosen a century and not a vector that are entirely a word vector. Why does.

B

It grow inside the memory and we always want objects, so we always need the entire field to be transferred on the clients, that is, the beginning of the script side,. We will need to read all the fields and we will update all the fields each step during the simulation,.

B

So we need to be able to read and implement this inverse entirely, that is, the vector is our collection for them special, which allows you to store several.

B

Value on, while those do not need to read them all at the same time, everything here, we need to read everything and so,, but maybe it’s certainly a lot to learn 4 when you can read the bible which needs.

B

Length will be next, that is, we divide by 8 and multiply by height.

B

B

This length in field to me.

B

Now how our edge will store the fields I thought about it, a little and came up with the following for each field by storing that is, firstly,. The contract can store more than one field at the current moment, and we can.

A

B

Vector for them, for example,, we can store up to exactly the present vector, which in one spoke of them collections pants. It will allow us to do it. Firstly, we will do it day.

B

B

B

For any of the fields, that is, on the client side,, we can choose which field we want to see now and take a step in it,, and also if we like some field,, we can fork this field, that is, we can copy and create a new field, and it will develop separately from the previous ones. The.

B

Second thing we need to know is.

B

Because we are going to cut the story more and on the client, it would be nice to see how the animation of this developed,, but at the same time, we don’t want the crypt,, but we can simulate it. We can read this with the blockchain additional.

B

To the field itself, we can store in which block the field was created.

B

B

When we do the simulation step, if we know the previous block, when the field was used last time.

B

Remember it and give it to the client and the client can, with historical data, count on the blockchain, therefore, and.

B

B

New object where we will lie on the collection will also lie on the current total. You honeycomb.

B

Leading previous music that is, this template.

B

Used before when I created nerves, this and a kindergarten network that does not store data. All data in the contract, but the place is required, creates links to the previous state of the blockchain and.

B

2 just use some kind of silence such transitions. Now we need to do some things, for example, that this is a position to be implemented in general so that it can be stored in the.

C

Contract,, the.

B

Following is to create a new board, create a field and return.

B

This we can create a.

B

Length vector, oh.

B

Vector well,, not that is, it will create a completely empty field.

B

Create that the same thing is simple: for our time: without a wordpress blog blog,, it will already take the board,.

B

But it was to insert the.

B

Previous block from the index variable,, let it be, by.

B

The way,, that's all we have- is initialization,.

B

We all really don't know how to create the fields themselves,, but we can already custodian now. We need to initialize the contract for this. We need to license the vector before the city through and fire, and it takes a unique prefix for this. We use a special structure called the oldies.

B

Which, for example, says a unique prefix will be.

B

B

Numbering which from zero and continues.

B

There we transfer.

B

Actually, here is our to as a base for working with this ready. We can check it that by combining prices.

A

So that it’s simple,, but they didn’t disassemble these 100 pens earlier in the lessons,, they can devote a little more time to this,. It turns out. We will have several objects. There,. The vectors of the boiler at the end took up,. We can set different keys in the line, billboard barcino.

C

B

Well, let’s say we can create an account to keep a list.

B

Of who made how many accounts and other times how many transitions did for this? We can use yes rhythms and a day.

B

Then an orgy with map is a different collection and it needs a different key. We can license the saw in the same way only using already grandfather than 100 crustaceans.

B

Data that we store in vectors will not intersect with the data that we store rhythm bananas and.

A

Will share the data structure according to these labels,.

B

In fact,, if we are all implemented,, then inside it’s, more angry, it’s, just like 0 bytes,, and this will be the first finger and it takes only one cell mast on it still allows you to do. If we want to create some kind of fruit, structure,, let's say inside the account. We have a different color by number that stores which boards you created. Then we can create.

B

Such a structure, as the pro account will accept an account inside itself and when we create the key, we can also dose her renzi, somehow cleverly through the datakam box. That will allow us to create a unique prefix for the data structure that is specific to this contract,.

A

The account will receive me further. If you then update your contract, for example,, you want to delete some 100 handles until you need to save this order,. Otherwise, you will mix up a contract with us, that is, each everything. If you migrate, one object to another, I’ll, just create new 100 handles and change the object, use kia shirts, it’s. Just that the old one is going into.

B

Oblivion, if we use, for example, account and account 2,, then it will already have Yandex 02,. But if we delete the old one,, then its index will change to 1,, thereby creating a conflict with this,. In order to delete, we must leave it, and just for example, we can rename it,.

B

This title is not used,, then it and nothing they spent on. You will continue with less technically until we create an empty one. How.

B

To achieve the implementation of what it is, but I haven’t gone through it yet so we have it all compiled.

B

And working now, what we need is to create a field that allows us to add a new board.

B

Open a port that takes its own field from it, creates a new boron.

B

How can we see the field, I.e. we can pass it like how's, the simple, a and return the number of the field we want.

C

B

Waste the index return.

B

C

B

Which is actually.

C

B

Now, since we use jason as a serialization or serialization, then passing a vector unit to this field, it will look like let's say we have 13.

C

B

C

B

Look like this line will look something like this. There.

B

Is some problem because it is not very efficient, that is, instead of one byte as we wanted,? Sometimes we will transfer as many as five bytes, because we have a space and three more digits so that this does not happen,. We have an auxiliary type,. It is called basic for mac,.

B

This is a special type that contains simply vector and after all, but it has serialization using encoding decoding using base 64.

B

This is base 64 of this technically ram is.

B

Pretty standard encoding and we can see how it will look like and.

B

B

Here pass our string for encode here is something like that I.e.

B

Well, so here y we have zero cells,.

C

B

Type, he encodes them normally, that is,. If we want to the place of the standard now we get a rather compact.

C

B

Three finger to lie or four characters the place. The cheat has no.

C

B

With the grandfather 12 characters, this is a pretty significant konami.

B

Since we have gas to read and write and then it becomes quite profitable.

B

But that's all what I was trying to say now: how do we read it initial? We need to create a field we can make it sang.

B

From this not yet, but we can.

B

She I vince another problem. We need to check that the size matches and for this we can make.

C

B

Falls with our expectation on the field namely, felt like, in fact,, we all created a new field from.

B

Data,, how did we bring it to the vector using the raster.

B

B

Hidden, how to be this.

A

Guys, song goblins for 1.

C

3 4 lectures it.

A

B

Well, or a friend,, we can just use that in the body does the same thing, that is, it allows you to convert the field to the type that we need,. But this.

A

Will already be the action.

B

A

We do not want to do,.

B

But it is about definitely, well, that is, it will grow without a difference so well, and now we need to build exactly a new board board without a block,. We are doing.

B

We have initialized our pain, the whole block,. All we need is now to add its vector.

B

Of this,, we need to create it,, we will have to be.

C

B

For the inserts vector.

C

Where there should be just a push to the.

B

Edge of france.

B

And a little index return, the index will be length.

B

C

B

Actually further, the board will return Yandex to us. Now you need to abort.

B

B

Return the option.

B

If such such board exists, if such the field is there,, then we will return it,, so the index,. If it is not there,, then we will not return it,. This is done quite simply,. We can do.

B

B

Binary in order to be possible, but using a different serialization, that is,, you can transfer them either directly to which under do not give names or.

B

Or encode it more, which also effectively encodes this data through binary, but for this it will be necessary, then, on fontaine de which will work with this write, a parser for binary data that we will return everywhere,. Now how we return it,, it will return it as a white century,, but probably what we should do is change it without being afraid of sex, so that I wouldn’t do serialization for days.

B

B

Now we can safely return this board and using here do from.

B

We can just change the viruses steve-o to make it easier for us, then it will be necessary.

B

Not to spend too much actually.

B

On this, we have everything.

B

Let create a field and.

B

And pro or maybe.

B

Firstly, check that it’s all cables walkie-talkies.

B

Everything compiles.

B

Not always test, we analyze the contract white record. We need to create a field.

B

Before that we can create a vector first.

B

B

Should not be, we can check that the index will show, since we didn’t have before of this field and.

B

We me now I know it.

B

Is necessary to see what it is puppets.

B

B

B

Index 0 and compare that they are equal,. We can now compare that the.

C

Weld port is to.

B

C

Our thief, kilt with.

B

We want to know what is equal to me in order to compare this. We need to add something,, namely.

B

How we do not need debug, because we are comparing purely and.

B

Now I need to run. It is this test.

B

C

B

B

Test works, that is,, we have everything about you, an empty field, carretera.

B

4 in 1 month and check it should still work for us,. Therefore, we can get the field and transfer the field.

B

So that we can see better,, we can now write.

B

Which will allow us to draw or.

B

Let it take a field.

B

Or suede do the following write a loop. We have a height.

B

B

B

Give our current index of the.

B

Three arrays: this will be the height multiplied by.

B

Now we know we can find out what the weight of the bytes of the.

B

Index is to what they succeeded. Broken,, you can do the following operations yourself; in fact,. This is the same as the Yandex bot.

B

And now mom check if this cell is there.

B

One way to do this is you can actually.

B

Move the board,, but all you need, is to print one of the symbols clear,. We have this bit in the field,. We.

B

Received an array of Yandex bytes,, we avoid it is filled with a zero index,.

B

If this bit is there,, then we set x otherwise.

C

C

After each line.

B

We need to output an empty line. Now we can also now I will answer the question. Well,.

A

What can I think is not very related to the current code. Let's postpone the.

C

Beech month.

B

Yes, what we did you dropped out the path and he drew us such a large field. It is not possible to view, probably you can make it smaller to start doing. 16 16.

B

Here is our field. Here is 2, which I put it looks like using 20, 4 and.

B

We wouldn’t be naughty shaky.

B

Walkie-Talkies for working with the field.

B

So it’s worth 8 on.

B

It 2 did we learned to print the pain itself, the following that we we need to write an algorithm that allows us to move from one field to another.

B

For this on, and we will need some things, such as what we did here, namely,, we will need to for board. We need to add some functions and an example.

B

From dc and takes a height.

B

B

Understand cardin x.

B

Read the index.

B

B

A

It just brackets on you open the bracket and even so.

B

We did the c drive also. We can do b.

C

B

He coordinates there and.

C

D

B

C

C

B

Gaitana declaring to leave here.

C

B

C

C

B

Orbit, this must be done and the.

A

Catalan magic hairstyle goes 6, yes, I.

B

Like it with my exports, I don’t remember from trouble. It works, but.

B

We can do this and do if the sky is there. We just have it.

B

In principle should work.

B

So that is us olya, which allows you to put troubles and read a beat. Now we need to make a transition from one from one board to the next disk. For this we can do in this.

B

B

Example, no new field.

B

Why do we have the current value? There is up to the board and the new new current block will be.

D

B

Well,, firstly, we need a heap of the field,. You.

B

Can give the new field.

B

C

B

While if the previous block.

B

Needed,, but if and now on, you can do to start running for all cells, count all all neighbors and make the transition all this is how I write it,. It will not be the most efficient solution,, but it should. We need to work.

B

We run through all the cells of the field.

B

We also run through all the neighbors.

B

White sex, if there is not enough gas to gain there are several years, firstly, write more efficiently than what I write.

C

B

B

B

B

First need to know if the current cell, that is, ours needs the current bid,. For this we make the current bid,. We ask for a board from ours, it burns us if the current bid.

B

We need the fields in the district,, let our cells.

B

Be equal to mine and.

B

B

X, does it up w, in theory, here it should be on here d 1, that is, for each cell. We.

B

Count the fields here we have our cell, it has 9 neighbors.

B

C

And females are.

B

Not in the center.

B

But what can we do? We can just ignore.

B

X, it and these numbers are non-negative. So if I don't know what unit.

B

I had the hour is a negative number, so I don't want to do that and I'll just check the dimensions we shift. Its cells here x, plus the affix.

B

B

There january we have b more equal to one, that is, at least one,, because we have plus one now x, is greater than one and less than the height,.

B

That is, we checked that they belong in the field from one then the height inclusive,, at least here we do not distinguish height, that is, we have a coordinate by. It, goes from 0 to.

B

Now we need to check if there is a bit for this,, we can do the sum.

B

If it has been completed,, we can also do a cycle if we have a.

C

Cell here and with a.

B

Coordinator 12 x, 1.

C

He will convince.

B

Us not to grow it,. In theory, we don’t need this bit,. We can calculate neighbors, including.

B

The cell that is,, it will be ours as a result of 940 sum, and we can make a transition if the sum is.

B

B

C

The path worked for you now.

B

We will just remove the current cell.

C

B

We will not read our own cell now if.

A

B

B

Go clever, that is, we have a living cage and a native bummer,, or we have an empty cage and the plane 3 until the cage will be alive,. We do not have a sports.

C

B

B

Other places and and dead,, but since we have an empty field,, we don’t need this operation,. This is actually the whole transition, and the last thing we need to do is that if we take several steps in one block,, we don’t want to rewrite the karen blocks,. It began to be erased,.

C

B

C

B

B

B

Everything we have written now, a big step method and.

B

Eric somehow works for this, we can write now on the contract.

C

B

The one that will execute it, I think we just pass the index of the tag and he can give us this highlight after he does it. Transition.

B

And, firstly, we get the current cell and let it be here.

B

We can say if there is no such field.

B

Over there we will make a panic. There is.

B

A

B

There is one, then we need to make a transition.

B

It is possible.

B

And we need to write it down in hertz. We do.

C

B

B

We also need me.

B

Under ownership, that is what we did. We got. The previous previous field made a move we saved, but this is a new field back the state vector and returned it to the user.

B

Now we can write a new test that will allow us to test our step.

B

Create a new board check, also mine, yet do not check instead restart a lot.

B

B

What text and we can do become.

B

After that, we can repeat.

C

B

C

B

This don’t finish.

C

C

B

In the groove I’m glad that we.

B

Actually have a stamp, we simulate ten times. Ten calls to the field, that is, here it started, it’s, probably worth all the same,. The initial field is also to draw a renshaw,.

C

B

Also need to envy some drama niche.

C

B

C

B

That is, here we had a tea board;. There were 2 cells; for some reason,. The next step remained only a sign., although in theory both of them should have died,. It means that something doesn’t work for us, well,.

B

Everything ended.

B

B

We can edit some fields at night and check that everything works for us,. For this you can write your own test. Of course, we won’t do this just quickly for several years.

B

Now all a square on the field somewhere around 5 5 in theory, a square it should not change. So all the steps should just draw this square.

B

B

Something went wrong: the square turned into something else.

A

Game of without any game of life turns out well.

B

Let's see what you did wrong.

B

When Sumatra.

B

Should remain equal there, that is,.

B

The doctor checks that he will either or there was no wedge and in the district.

B

If you are a, and in the district there are two cells, she remains alive: the sky. If in circles three cells, you understand ours, she was species. No, she stays.

B

C

B

There one of them died for some reason.

B

We do something wrong,, namely with 4.

B

Are you correct or write the wrong bits? It.

B

Looks like an error but reading the.

B

Difference is that here, I shift on this side, and here I’m on the contrary, it’s such a different side.

A

And sometime you count the square there. You have the indices,. There may be an error where, where.

B

Where 2, that is,, it is 0 1 to 2, miss 2, inclusive.

B

Natash, what is happening with this cage? Why is it special.

C

A

Are missing yourself? Your index on curlers is no, no, not the top one.

B

It's all because there are whole numbers work thanks. We.

C

B

B

Here we attack all the square, remained it’s good. Now we can draw a glider, I honestly don’t remember how a glider is drawn,, so I.

C

C

A

Some kind of garden conditions- and this is also there,, although if suddenly they are aware of game of life,. This is some kind of huge area of scientific knowledge, yes,. There are many many scientific minds, modeling based.

C

A

This theory, there are.

A

Already a lot of ready-made examples of a state that somehow develops into another in a predictable way,.

B

Without animation, well, well, it’s clear to accurately draw three cells in a row,.

B

We can simulate this.

B

That somehow reduce here and not fix these frames, that is, here we have a standard glider and it theoretically flies forward, that is,. The idea is that you are moving forward. Diagonally to the right down is the standard state. Here it has moved. Two cells turned back. Its initial state continues to move.

D

B

Can correct all the mistakes now that we don’t? Actually we.

B

Billy ruins contract most likely, we don’t have a series of ice in the margins, that is, firstly,.

B

The main mistake in that he says that our lines here are not able to aim or go too far, jason. We need to make the green one was erased. Also for the ford explain where to get.

B

Same thing, we need to do on the field itself.

A

If we worked just, it was completely virtual from growth yes, without any sudden.

C

A

But purely on pure growth,, they launched here already a little.

B

Bit to correct our articles.

B

Possible at least.

B

E one more thing we can do is the login, that is, we can draw it more and more on the idea to.

B

Display it on the blockchain, now when we launch it,, we will have it in communication,. So now our debug board can be rewritten because we have magic to get rid of biceps.

C

B

To test again that we already have dissatisfied errors, almost a meter left small.

B

Minor errors in the area.

C

B

Actually on it is possible for to well,. You can also put it in the mass blockchain this contract so that you can test it for this. We just need a term I hope it is now compiles.

B

Here appeared played on, takes only 116, kilobytes.

B

Maybe you don’t return very many.

B

Methods we can test it positive, no it’s done quite simply by.

B

Calling to in deploy what to do until where the fight is using helper, you need to remove and which creates a new account and puts a new one on it. Contract and also it gives me the keys to this account. So I can renew the key store locally.

B

A

Already been parsed now we just.

B

Need to initialize this contract.

C

B

Now ours is initialized. We only need to actually create this board on it.

B

Just given that I need to pass the array through basic steve, but for this I use share, there are two ways: one.

C

B

Is this we use a sew test, that is, my niche board is outraged. Why you don’t sirle backwater.

B

Jasen so that I already have it ready a line in the text form he doesn’t have,. But if we have a secret of places that I can use to make an incident.

C

B

We go down to this test and, in addition to the fields,. It will actually give out what I need, they will bypass, which I need now. I can take it and.

B

Will set fire to the.

C

C

And this field.

B

B

Actually, here I created field 02,. Probably my explorer is not visible,, but.

A

B

That he spent 6 gas in total,. We do 6 horns for this, and so,, but it doesn’t matter,. But now we can call this contract again and make the gadget.

B

Passive Yandex oh, he owes us to return. He said that in this field, some.

B

Now I can again just take a chance and he will not favor the next step. I can.

B

Step now, let's see how much it costs it costs us.

C

B

Dashes of gas, that is,, it works quite effectively for a small field.

B

For which we did karen blockchain, you brought it badly and we did it so that if our world standard interface allowed the place of the final block to transfer the.

B

Previous one, I didn’t think that it was possible, we could,, but.

B

We could leave the field which field was at this index,. Therefore, and the garden is recursive, we could restore the entire history of the steps, that is,.

B

Using given before training.

B

And restore the entire field, I think you can stop at this. Get better and answer more questions. Answer questions. Yes, thank.

A

You for the code, but I will try for the slope of the frontend. Of course you understand there are busquets calls yet, but not everything will be so forward what we will try to arrange some example of.

B

Me so I would like to add. Probably but I can already start answer questions or my vadim. What to answer is that when you make a get board, then we would also.

B

Look for a length to draw this blog. So how long is the history of the bards training? We have two types of clients, one. It is called normal and the other alder archival about kylo normal stores, the history of all blocks for about five by god and god, and go epochs,, which is about 12 hours, that is,. It will save it for two and a half days on average,. After that it forgets the historical state and it only stores the haders.

B

Now,, but this is a cooking wave that stores the entire the history is always then in fact the evening is stored. There, then it will always be stored at the same time,. We did not use a lot of data.

A

Learns that if you want to make such an offer to make an application yourself,, you can run the archive leg yourself and please it will be your home server, as it were,.

C

B

Gaspard login from actually not very expensive, that is,, but they are limited in size, that is, you can’t do too much and over the.

A

Line bridge restrictions should continue to fly out to the word, because of you. If someone whose cycle enters the login, you can carefully work with him, because suddenly there will be too much. Motorcycle just goes astray with too many logs issued and put in a row to varnish.

B

Write a new helper here called.

B

Mine command me this.

C

C

B

For this we need a move that I already wrote, here,, something like that.

B

My girlfriend doesn’t write. It, we’ll write a service, a couple left.

B

Serie of the end somewhere, that is, we started the log were purely for debugging,. Then we decided to use the login in order to generate events in principle,. They are stored on the blockchain and are provable.

A

B

Some things are missing: now, it’s, more freeform login,. It would not be bad to use them as binary.

A

Per channel to take into account the wolves, yes, it’s, not the gods themselves, who.

B

Generated events, well, that is, indexes can read the login.

B

You can brother set the string.

B

Does not know 1.

C

Without brackets and.

B

Now we have what to do like.

C

God will do.

C

B

C

B

But we will add everything and boron like blogs. Now we can insert it some places and then I won’t answer the remaining questions.

B

B

Board is being created.

B

B

Ladies case, the board.

B

B

B

But you need to give a bunch of logs.

B

And that it works, it’s going to.

B

Compile the contract and put it back.

B

So there are no events and events as such, that is, we don’t use it,.

B

But we have no, no, it disappeared, which I would like to do add events to the environment, officially, that is, how they should be, how indexed parse should you have not changed the stakes,? We can just go to plain cont ract on the same account, you don’t even need to approve its first-born,, and now, when we call the next step, in addition to this,, we will also draw more fields, that is, this old one was now it’s new,.

B

Now, if you open explorer this link,, all these lags will be there too now gloves on the link so as not to go wrong.

C

B

We will answer questions.

B

If, as standard means for calculating the checksum,.

B

We have any alcohol eight, but o.s.

B

0 works as standard, that is, we can take it, it’s, not worth it and transfer our account,. It will return it to us.

B

Return it already, that is, it’s es explorer, that is, here it is the checksum,. Now we need to generate a checksum for our file, here. It already depends on the environment.

B

In theory, we need to generate sex for the file here.

B

It is the niche the show on.

B

Maybe installed that's why they will.

A

Teach you wrote a hint, but.

B

It works well on linux, on.

B

B

There is a chance- and that is mine.

B

B

You can in 5 minutes, because, as it is written, the.

C

Usual ones are so powered,.

C

You need this calculation from sex,. Let's.

C

B

B

B

C

B

Is, you can convert now how to make sure that the contract matches the cache for this. We can use docker.

B

D

B

B

Binary contract, it will be unique olga not it will be the same on all machines, such from the dockers we have more than once decay name. The tip of the builder is given, and I will also give a link so that they can use the.

C

B

Principle, the inscription is this: to use.

B

Whether you need to know on which version the contract was built, in theory, it is desirable when we publish contracts on the blockchain,, then, before that we create a release version using docker, and then we can already prove that the contract is created.

B

Because it is oops to be created, how many words that I missed I.

B

Missed the microjig there.

B

From the contract,, it is basically explained that it is.

B

More important to do migration on fields that are not made versions, that is, the contract itself is updated, quite easily,, while the fields that are inside the collection are updated, more difficult than migration, a contract can be written as follows, can be done and not. We had.

A

A lesson on migration map collection- specifics is specialized. The question is exactly what the size of the field is up to.

B

And in theory the field is simply not so easy to change,. That's exactly why we started to do for most contracts. We started to do in peach fields. That is, we do immediately back up the field before the first time. The contract is cum rays and it will be decided actually represent ourselves.

B

B

Now we have the mafia stored, not just an account that can contain in the field. Let’S say something full of idea.

B

Ll and suddenly we decided to add new pains some account.

B

You had a new balance types beat, even if we just add it, then serialization will not work, because the old field did not contain this balance and brother, that is, some accounts. New accounts will contain this field of the old account. They will be. What we do. We have account, we create a field, let's say we rename it to an account.

B

This remains us an account. We add herbalife.

C

The original is experienced 2.

B

Contains either when we are here and we implement it and the.

B

Capital will remain for us 1 hryvnia. The new version will use the skills and it is worth writing a halter that converts.

B

Centuries from you the same way but usually sang.

B

Does he does the following? Does you know.

B

We have d va fields, it will be a sofa for a.

B

Regular account,, we didn’t do anything to do that. It’S from the.

B

Old edge,, we need to create a new account and the old one for this. We need to fill in the understanding that already exists and.

B

Initialize, the new field with a new field, something like this,, we are death to water and an account and on the cheeks. Now, when we implement d, we can always call this operation. It will give us the latest version of the account when, on the contrary, we want to save. Then we write one more thing: only in the opposite direction.

B

We have an account, we need to return on horseback for this. We just turn the cards more, actually, and that’s all for.

B

Us now,, when we read this,.

C

B

Consider the account, I removed it sympathizes,.

B

We’Ll just transfer it to a regular quantum in the afternoon and return the sheep.

B

Actually, we can do an upgrade. There was a contract where the structures internally can also be updated.

B

From now how interesting develops a blockchain corner in general? It was very interesting, especially when we worked itself will give a runtime.

B

Blockchain can be divided into several things from the consensus network,, which is included mainly in the consensus of iran,. Then they are a little independent of each other,. The goal of the runtime,- and this is, if you get some data as an input,, display other data,, that is, it receives the previous state,. It receives a set of transactions and issues a new state and what operations were performed, for example, in the log,. What operations were successful,?

B

What problems,, how much gas he spent on it, in fact,, getting it costs, plus some transactions to get a new one costs?

B

What we did in the world,. We decided that we would not do to the location accounts, that is,. We will immediately say that even if two accounts at the same latitude are on the same machine,, we will be that they are not on the same machine,.

B

This allows you to remove.

B

B

For two accounts: Dicinon is large somewhere, that is, they choose from this, thereby they will try to accommodate everyone at the same latitude,, thereby slowing down the work. The entire network, on the contrary,. The accounts will try to be placed at different steps in order to balance 7,. This also allows us to balance the network at any time,.

B

And [ music], it is the state by placing the account and so that the most optimal transactions fly in the next era and therefore we created without asynchronous runtime, where possible, call other contracts through huge calls. We had to think about how gas works, how returns work, how data flies and how to make it impossible to block the contract, and we guarantee that some options from this are still not fully resolved, but for the most part it was quite interesting knowledge for this,. You just need to know.

B

That is, I worked both,, no knowledge was needed,, except for the fact that we integrated it into the pool there or for smart contracts,. For this we had to figure it out ourselves in possibly how the memory works there,, how to ensure that the termination ravana is performed, how to measure g az, and so on many things we just took the evaporator of the original substrate,. In the end, we rewrote most of them for ourselves,.

B

B

Formal verification, I think that now we don’t have.

B

Such tools and ser, that is, I do this life review contract. If there is a contract which you need to present or you can easily just write to me in a telegram and I will add it to the queue. If you need some kind of major audit contract, that is, it is required there either. It has already been launched or is going to be launched on a coin,. You don’t need to see everything in detail,, you,, too,, well,, so contact me and me are already spending more time on this than just an hour a week.

B

So we didn’t do formal verification.

B

We don’t have automatic tackle either, but it would be nice, I.e. it would be nice to write some kind of bonds that allow.

B

To check this basic stuff for example,, a linder who says that for each swear for each seiner type ID, if we use it,, we don’t have to sayr acc aunt. We can find here it’s exactly right to use the rogue itself,.

B

Or if the method uses the deposit types to compare the deposit with the nose, it’s not marked as dead,, you can also say it,, but in theory it’s aimed at ensuring that all this is marked when compiling there.

B

Instead of writing all sorts battleships, we are trying to catch all the errors before the contract is compiled,.

A

You can say that if suddenly either I or someone else, our viewer wants to write such things or against us. There will always be a bounty grant for this,, so contact us. You are such a great interest in verification. Then we will help you to implement it,.

B

Will there be any activities in the Russian-language format in the future, I think yes, these within the.

A

C

Caton,, which.

A

Starts tomorrow, there will be many abortion shops and some Russian-speaking speakers to give you at least an easier understanding of English,. This is our guys,, but also for loyalty. There, ask them to do it in Russian,, it’s, also quite possible, so I'll send a link to the existing one in general. Well, follow everything subscribe to this cotton receive notification of all new interesting video streams and lessons.

B

I'll beat the contract, I can set it up for myself and then looked.

B

With immigration tests sappers incomprehensible moment in the explanation of the big update when needed, migrate in several launches,.

B

Of course, a difficult option.

A

In the chat,, I threw arrows, an example, when I did the actual operations for you, there, directly specific club, do several times updating the contract, sent the code to the chat,, which would be nice,. This is done first,. We save the old object that we will not need in the future. We just need it in a new state,. Then we gradually delete the data from it,. Reducing the value of iso there, fill in the new object as a result of our Ilyinsky operation,.

A

It gets again the object of the old flight with an empty rt disney,. The correct approach is necessary.

B

When it should work like this.

B

Why do we need epochs of the epoch in gear are used? I am in order to update the validators during the epoch and the validators do not change during the epoch,. You can tell how much the stake wants to increase or decrease when the epoch ends,.

B

All the validators recognize them and they come into force after several epochs,. This is required in order not to be in the last moment, at the end of the era of some major changes,, which of the new ones will suddenly mature,. The beam will have time to download the state for this shard.

B

As a test,, we only have money than a lot of fire. Lingu things, that is, there are more simulations,. They took some kind of cloud scattered cars, starting only on deck and thus testing it.

B

There are local tests that are just testing on one machine. There are many.

B

Uni testers, where it is simply checked that the transit is happening correctly in China lunch and are checked and.

B

But the main problem of holding is there. It is precisely changy that is,, if any of the steps starts to work wrong, if a million ways, how can she do it or and to show that it was wrong, all other lords without a state, must make sure of this. Some simple challenges with the signature of several blocks.

B

At the same time, it is easy to prove when a correct transition is created based on the wrong state,, and this is not so easy to prove, that is, such attacks as if the Tatars completely captured the entire ball and and the correct transition that was not caught by the challenger or this chan di was ignored, and then they made the correct transition on the wrong stand. At that moment, the challenge is not trivial, because you need.

C

B

Prove that well,, how would it be then.

B

Should we just chop the node, because the options no longer make sense, because an incorrect transition can go to any state? And when you check the beginning of the wrong one, you need to make sure that yours is not red for some workflow at home, or my mobileme is here more than.

B

A lot of things: what are the.

B

Results of charme. Well, yes, then e. There are main problems, it’s the challenges to shoot. It would really be a huge limit where they don’t require from one machine, that is,, none of the machines will be able to process all the shields at the same time, that is,. This is the main change.

B

If this is achieved,, you can run a real shardin more than that benefit. Current results, I think we will have somewhere around 8 steps that is going to launch it somewhere in eight steps where the validator is led by all shards at the same time,. While the corpus should not have held all the victims, that is, ordinary nodes were not Tatar, they will be able to check the network and monitor some accounts separately, that is,. If your account is on such and such a Schengen Tatyana,, you must know all the others,.

B

This is more for the contract,, the speed of work, that is, the skilling went quite well,, I won’t say that it changes linearly,, but they achieved good results so that in the region of 4 thousand transactions, there are.

B

4000 transactions per second in eight steps. Girlfriends can be world engineers new slider, subscribe there you, it is published, detail.

C

A

Teresa stones than money nadia in teams over the network gives out news and there is an irregular grid. When you can listen to how the team discusses the update, what it will be and the key is a.

B

New programming language for the nerve, this is, in my opinion, there was one of some languages that would support barefoot,, most likely. There is quite earlier support for kazbegi now and you can read about it,, but it’s unlikely that it’s quite enough now, that is, most likely there. Everything was earlier there to launch some basic contracts,, but not so come on support for all collections for old collections and other interfaces,.

A

D

Not very happy.

A

That we won't answer all the questions in detail, well,. How would ours mean to learn to program for some kind of nervous, things?.

A

. she has . orb to the collection of answers to simpler questions, to sort it out in more detail, however, yes,. What.

B

Exactly are the results of the sharingan tests, that is, I don’t know what to answer,. But how would sharding work if you have access to all the data, that is, the largest that when one damn thing makes a wrong transition because we don't have.

B

Challenges that are included on the coin and it's not a flash and where the same big punishment is to throw out the validator who made the wrong transition on the jordie data. And if you just follow all the domino ball, you do it just heard, in principle,, it’s possible.

A

To establish that, thank you very much to everyone who raised the issue of small money, went wrote such a contract,. We’Ll try to make how many prime ministers or here’s an application of some kind, well, that our course is over, I hope there will be new thanks to everyone who was present, subscribe there katona nier, to participate and develop your applications here already further. He cooperate like here on integration level,. We can help with grants and support,. So the wolf is here later before.

C

D

A

Your application and the genius to make your preview in contact and loving and then a happy future awaits you blockchain developers here, but thank you for listening to our course.