Status Tech Talk, 29 Jun 2018

Previous Meeting

⏯

youtube image

►

From YouTube: Embark 3.1 Walkthrough

Description

Iuri Matias walks through the recent Embark 3.1 - Planet Express release. Embark by Status is a fast, simple and powerful framework to help you develop and deploy Decentralized Applications. Get Started at https://embark.status.im/

00:10 Introduction
00:46 Only compile contract without deploying
01:31 Autostart node based on configuration
02:57 Syntaxes
03:34 Loading screen
05:07 ENS support in EmbarkJs
06:35 Contract Profiler
07:10 Embark graph command
08:23 Customization option for graph
09:03 Specify provider to upload (Swarm/IPFS)
10:46 Specify account to use
13:07 Specify environment to use
14:07 Faster test via plugin
15:26 Complete revamp of test
15:58 Use all contract configuration in test
17:34 Specify contract to test
18:32 Result screen

A

Good morning, everyone we'll start now the token presentation about embark 3.1. The first thing we'll do is to to actually run the theme park demo, and this will generate the theme park. Demo templates.

A

So all the first access the templates, then another terminal also will access it and a little putting green, and the first thing that's available now in in embark.

A

3.1 is that if you just want to compile the contract, so you can have option called contracts and that will only compile the contracts or no, they will not attempt to to actually deploy them. And another thing is that, as you see, it will start also a blockchain node by itself. If you don't have one available and take care of all of that now, if we do it, I imported run.

A

This embark and again not the difference, is that before you would need to run important, blockchain or inbox simulator simulator. You can still do that. However, impart will try to connect to a node, and if that node is not available, then it will initiate. Will by itself start a blockchain toad will start an IPF, a server or a swarm server, depending on the configuration that you have for your particular application, so the non pricey here they Bart demo, so I can get value, I can set, and no one would use that.

A

We see that in the Bart look, it's actually intercepting that transaction its decoding it. So you know exactly well what is the book? What is the contract that it's actually being called? What is the demented? That's being called and where's the value plus the the transaction ash and as well as the gas values and the block.

A

And again, if, but here another value say 101, then this will this will switch to? Who will look at 101 is that the transaction.

A

The other thing I'm showing you is that so the embargoes are added the new syntax. So if I put here embark storage, what's going to happen, then it's going to say it's not available because it does not exist in the global context. So I can go to here to where that contract is defined and just like a small trick. I'll just put it in in the global space just temporarily, so we can use this and dev tools and I'll do the same point. Barking.

A

Yes, I know this will you'll see now, there's animation when the bark is actually building and automatically would reload. Now.

A

The syntax usually would embark just with the web. 3Gs 1.0 is that you have to do, is in the contract name, dot, methods that the method that you actually want to call, and then you do a dot call or dots and depending if it's a constant or if it's something that needs a transaction. So to do a gets. You will do this and to do a set.

A

You would do something like dot method set, say 10, then we'll do a stand, because this is actually a transaction that is to be created and that will create the transaction. Now with the work 3.1, the the syntax that used to be available in the older version of what 3GS it's also available.

A

So you can just do it Katz, and that will be the equivalent to to this to this longer one, and you can also do something that is a transaction, and it was also still work so in part, we'll try to figure out if it should be a sign or a call, and it will automatically do if you, if you really need you, can still use the old method of the using the Matteson specify if it's a set or a call.

A

The other thing that we added support for, as you can see that now there's a here master, saying: yeah, that's not real live in this chain, so embark important on supports. He ENS, we still got support on a development chain. I will be in next version. It will embark, will automatically deploy DNS contracts to your devote more travel chain, so you can also use them and test for now in 3.1 we can. We can use it by, for example, going to Madame masque and I'll just low counts.

A

I mean the main that so I'll reload the page and now I can't do something like embark, GS names and resolve, and, let's say, a team that adds and that will return the address associated to a team axe. I can also do the reverse of that. I can do a lookup for that particular address and it will return. What is the the name associated in this case? There is an alias here, so if I do it here, foundation is actually the same. So it's the same address as well as this and yeah.

A

You can do this for maintenance and any of the test nuts, so I'll just save this.

A

Now other features to include you: can there is a contract profiler so which uses a buzzer to determine the gas estimates that are associated to that to that contract? You can see one of the function names you can see if it's payable the motor bility, if it, what type of inputs does it get whatever outputs and as well as the gas, the gas estimates associated to it.

A

Another way you can visualize contract is through the import rap commands, so this command typically. So if you can just use a import graph and that will compile and determine all the content are related to each other. What are the their dependencies in an essence or if, if they use say library is not kind of thing and it will generate generate a diagram, and in this case just one contracts is not terribly useful. But if we go to our projects say like that.

A

That would the status contracts, the project and I say, let's say I'm going to generate skipping the undeploy all deployed contracts. This will generate a much more interesting graph.

A

So open diagram.

A

Does the connections between the the grab its it can be a bit noisy if it's, because if your contract has a lot of matters and a lot of events, so when they worked at point one, we added a lot of options to customize this a bit. So you can say: let's say I, let's say I, don't want the functions. I just want to have the rats then I can I can run the bar graph, but by skipping the functions.

A

Will generate a much much more much smaller graphic bit easier to TVs, so there you go, and you can also even get rid of the events, and maybe it was smaller.

A

Another thing that changes that before to upload the application to swarm or a TFS we're doing work upload ipfs, not that change. No, you use fine. We start with only specified environment if it's the vault or tasks that, depending on your configuration and the configuration itself changed so so you have upload where you actually want to upload your application and what is the provider in this case the IP FS? And you we also put that connection.

A

So we make we make the distinction between what where you plication will actually connect to and where you actually want to upload your your application and and this that connection works. It's pretty much like what we do in the contracts. So in a contract where that connection and put a list of connection attempt, so first of all try to use a work tree object if it's available, if not, they will try the web sockets on the local loss and then we'll try the PowerPC La Crosse. So here we can do the same thing.

A

We could actually say try connect to the local host and then, if that's not available, then connect to like a public gateway and to upload. Then because the because it's specified the provider here as ipfs, then I. If I just do up embark upload that will that will upload to ipfs.

A

Okay, so another another. A really nice feature is that now in the contracts in a contract, besides specifying the deployments which which much more granularity, you can also spot to specify accounts. So buddy false in part, will use that counts of the nodes, your connection to you, but you can also specify accounts on the on the config. So in this case let's say: I take this mnemonic I created this mnemonic.

A

There's no funds in the locknut for this by the way and and I go not to my crypto and I, create to see what are the address associated so I can see, it would be say, 0 ax e 71 is your ax v. F7 and I can also specify the the balance associated for this, and, if you are running on my own development chain, then embark will automatically founds the dire. That particular comes with the bonus that you specified. So now, if I go to embark, run.

A

I'll, just let this start.

A

So now, if I can do that yeah, so if I check one of accounts, so I can see. There's two accounts: 0 XE 71, which is this account and 0xb f7, which is this accounts and checking the balance if I try to get the balance or the poets at the first accounts.

A

Look, you can see it's it's five eater I mean it's less than five meter, because this account was used to to deploy the contract. So there was some some ether that was already already spent and another. Another thing is that you can specify the deployment and so default is something that applies to all environments. But you can go, you can do the development environment, which is the environment that is.

A

That is wrong when you do in work plan, but you can also specify other likes a class slacks, and so, when you run a bar run task that you will run the configuration at the taxis here, so you could do something like deployments and then say something like this, and so, if you wanted to deploy to interfere or you could just to find the host, what would your would your key and making sure what about HTTP and that will deploy to you to change sheera using backgrounds that you define very good point here now?

A

The other other improvements include: the tests are, are far faster, I'll just wanna. First, the the first test that should take around 8 seconds or so, and it takes that long because it needs to load solidity compiler, which is which is quite heavy one. One thing you can do to to reduce this: it's to installing parks, OSI plug-in. So this is a plug-in you can find over over here they work framework to box OSI, and this will use the command line version of solidity.

A

The disability compiler, which is far far faster, and so after I install it I like to go to import Jason and I'll. Just add it here, bark so see parameters, and now, if I run again the same tests, it should be far faster, so yeah I can see it took three seconds instead of seven eight, so it makes quite a bit of work in the difference and the test itself. Now they are dart. Well, we completely revamped the tests, so you know it's.

A

It is a breaking change but who believe the test this way they are much more accessible and easy to work with. So first thing is that they no longer available. The contracts are no longer available in the global context context. Instead, you need to specifically require the contract that you have you. Can you can still configure the the contracts just like you would in contracts, Jason and.

A

The other thing is that all the functionality that's available in the contracts configuration you can use it in the tests, so you could define deployments in case. You want to connect the test to another node and you can also define accounts so, for instance, if I put here that counts and.

A

And let's say at the point here: five accounts then this should create. This should create five accounts that that are generated from this mini monic with the wood fire eater inch. So I can just do here, a simple, a simple task. Let's say it should have five accounts.

A

Function- and you know got accounts awaits what is available still global in here and then I'll do a search strip. Equal, come / 5, let's see if I do enjoy mistake,.

A

Oops I didn't mistake.

A

Last time, oh sure, well operating mistake here somewhere anyway. The other thing is that the perils of life Daniels you can also, if you want, you, can also deploy the contract. So you can say I should deploy new contract instance.

A

Let's say: I just wasted from ministry.

A

Let's wait for the results.

A

And I can assert, the results would be 150 and again so you can do this sort of test which studied so, if you want, you can just take the desk contract object, even if you don't deploy it in in the in the config, and it just adopt the diplomat yourself, as as you wish, I can see that it it worked. It got a new value, so more information about the tests can be found in in the bark dogs. There's a text testing section and you can see some examples which variables are available, also configure accounts.

A

So you can do other things too. You can you can specify a private key file and specify a directly just a private key in the config. Although you shouldn't do that in in source control, just a warning, you can also specify a deployment node in case you'd only use the internal virtual machine that counts, and you can only can do also the deployment yourself of individual contracts, if you so wish, and so more information can be found in the blog post by parts taxes.

A

So that's it and thank you.