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IOST Developer Channel Chat

12 August 2019

2019-08-12×

12 August 2019

H

Sounds interesting!

I

For sure! Also have to figure out how to do like, 20 limited edition tokens under the prize name.

H

Limited token !

I think I’m going to do what crypto kitties does which is have a contract that keeps track of the token #.

Like this token is 1 of 10.

I

Like token IDs 2-20 are T-shirt’s and there’s 20 available.

That's good idea!

Have you ever heard genesis kitty?

H

I heard it was sold at 300ETH

I

Yeah!!!

Uniqueness. 👍

H

Стикер
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id 637537420Like this token is 1 of 10.

Be careful using sequential IDs. It probably won't be a problem, but they are not reorg resistant.

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Imagine two tokens are added at the same time. Initially the contract accepts them in order of 1, 2, your server sees it,then blockchain reorgs and they are stored in order of 2, 1. Your server will have the wrong info.

id 729609566Imagine two tokens are added at the same time. Initially the contract accepts them in order of 1, 2, your server sees it,then blockchain reorgs and they are stored in order of 2, 1. Your server will have the wrong info.

That’s good advice! I think for now I’ll be minting them myself.

Since we’re doing limited runs of unique art.

I’m having some commissioned by artist here in Austin TX.

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Some posters and other stuff you might see in an arcade.

It's okay to have IDs like 1,2,3, just make sure you use some other unique identifier that won't change in reorg. The best thing to use is actually a txid.

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It's more a problem with something like dice. Imagine you payout game 3 to game 2, and game 2 to game 3 because of an ID swap. It's a nightmare. txid can't experience problems in reorg because it won't change.

id 729609566It's more a problem with something like dice. Imagine you payout game 3 to game 2, and game 2 to game 3 because of an ID swap. It's a nightmare. txid can't experience problems in reorg because it won't change.

That’s awesome! I’ll check it out!

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It’s crazy what free tokens do! 350 new users over the weekend.

H

id 637537420It’s crazy what free tokens do! 350 new users over the weekend.

That's awesome!

Just for a $50 airdrop.

I

Not bad marketing at all.

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id 729609566It's more a problem with something like dice. Imagine you payout game 3 to game 2, and game 2 to game 3 because of an ID swap. It's a nightmare. txid can't experience problems in reorg because it won't change.

What's the main reason of "chain reorg"?

Fork in consensus

Two chains form, then one of them is orphaned

Same as bitcoin

Longest chain will win, I believe.

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It is uncommon, but happens.

H

Is the possibility of iost higher than any other blockchain?

Not really

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Usually resolves in 2-3 blocks from what I see

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I think less likely since nodes are so coordinated.

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I have never seen a reorg worse than 3 blocks

H

I see :)

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Peer to peer communication seems efficient.

But, I also don't watch it 24/7

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How did your contract work go? 🙂

I

Who me?

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H

It works like charm

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😎

Thank you

H

Your advice works well!

I

Beautiful 👍

Working on a leaderboard.

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Фотография
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H

id 729609566Beautiful 👍

😍

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heaqaФотография

Yessss I’m in the data.

id 637537420Yessss I’m in the data.

Yeah~~~ haha

H

id 637537420Фотография

Wow 1360 score!

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That’s overall. I think I’m going to have it payout some rewards once a day and reset.

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I see, it's in SQL.

H

Yep!

I

looks good 🙂

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Using ArrayMap is really good to work

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H

😃

Ah, I see you use normal storage with serialised array instead of arraymap

It's also fine

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It can store more items this way actually

H

Oh yes, it is not arraymap actually

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Yeah, it's fine. It will allow you to store more actually.

H

I heard that It can store about 65536 bytes

Yes. Quite a lot.

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array map limited to 255 entries I think.

And server checks RAM per 1 sec

H

:D

1 sec is good

Another thing I recommend. Write fail conditons because api.iost.io has problems often.

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It is better if you can get a few node IP addresses to use

H

I use my own node!

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And if you can publish on one node and read from another, it's even better.

http://iost-qed.net:30001/getChainInfo is my node

H

id 729609566And if you can publish on one node and read from another, it's even better.

Good idea!

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It means you don't ever have a front-running condition.

Nice. I got my own node just need to setup nginx proxy.

Haven’t done it for mainnet yet.

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For SSL.

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Ah, should just be simple redirect.

For testnet I used let’s crypt and a subdomain.

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Alpha.blockarca.de:30001

Yes. This is good

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Some nodes do not implement SSL

H

I haven't as well

This causes a lot of problems on frontend because most browsers like chrome will throw errors for http requests without SSL

For backend, not a problem.

Think about the scenario. Your website is https, then you try to use api.iost.io on frontend with iWalletJS, and you are routed to a node without SSL, it will downgrade to http then throw an error.

It's quite important that nodes implement it.

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For backend, you don't have this problem.

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Ссылка
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Has anyone played with https://developers.iost.io/docs/en/6-reference/SystemContract.html#newvoteowner-description-config yet?

H

Not yet!

I’m going to experiement, it’s got some weird properties.

like it costs 1000 to start a vote, but you get it back when you delete the vote.

I

but it doesn’t say what happens to all the IOST used to vote for the options.

Calendar: August 2019

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