Questions tagged [smart-contract]

Anything related to decentralized application (dApp) development, concepts, and possibilities with smart contracts, or technical questions for the development of smart contracts.

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multi_index table get const_iterator at a specific position

is there a better way than a loop to get the value/const_iterator at a specific position in multi_index table? current: auto idx = _table.get_index<"name"_n>(); const_iterator b; int count = ...
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1 answer
35 views

Nested depth exceeded

kipping set abi because the new abi is the same as the existing abi Publishing contract... Error 3070002: Runtime Error Processing WASM Error Details: Nested depth exceeded pending console output: ...
2 votes
2 answers
85 views

Is there a way to prevent me spending tokens until an action is called?

I am creating a smart contract but came to a halt when writing the code. Is there a way, in a smart contract, to prevent me from spending tokens transferred to me by another user through the smart ...
1 vote
2 answers
51 views

How to tell a certain contract in indeed used in a dApp?

The dapp review sites often list the contract names a dapp is using. I see that this is added by whoever has added that dApp into the review site. But is there a verifiable way (through an explorer ...
1 vote
2 answers
173 views

How to get a contract to accept tokens as payment

I keep getting the following error: transaction declares authority '{"actor":"test2","permission":"active"}', but does not have signatures for it under a provided delay of 0 ms, provided permissions [...
0 votes
1 answer
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how can my on_notify trigger calls contract actions (permisson issue)

I need to write a contract that automaticaly mint nfts when tokens are being transferred. So i have my : [[eosio::on_notify("*::transfer")]] void logdeposit(name from,name destination, ...
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2 answers
102 views

Is there a way to issue tokens infinitely?

I want to design a system where token supply can grow infinitely. Is it possible not to fix total supply at the token creation moment?
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1 answer
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make inline transfer contract and using it on jungle testnet

hello everyone i am faceing a problem on jungle testnet i am trying to make a inline transfer but i got this error after i work with the api_endpoint the code is #include <eosio/eosio.hpp> #...
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1 answer
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Question cost while using token contract

I am sorry to bother you, I am a little confused about the cost while using a token contract: the contract provider will pay all the utilities if a user using the contract including the CPU, NET and ...
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1 answer
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how to get cpu usage of prev. actions in contract call?

Is it possible to figure out before transaction is completed, how much CPU an action in a smart contract will use? E.G. I make transaction with X actions + call to my smart - contract. Is possible to ...
0 votes
1 answer
207 views

How to parse json string in contract?

My contract want to receive transfer with memo in json format, is there any libraries supporting the json parse?
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1 answer
126 views

What is the ledger in EOS?

When I create a smart contract, e.g: game. what does the ledger store? (EOS tokens, or heathy points, level of user). If the ledger stores heathy points, level, so how I can push it into block (...
0 votes
1 answer
75 views

I would like to make listener contract

I would like to make a contract, wich listens to the incoming transfers. How do I make a listener contract, wich listens to incoming transfers on the account?
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2 answers
129 views

How to pay for user resources cost for payable action?

I have a smart contract which has a payable action defined. I want to cover the cost of transfering token to my contract, what's the best way to do this? Thanks.
0 votes
1 answer
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What is the eosio private key when running on local?

I was trying to test the smart contract I created in my local but I am currently blocked as I cant create a new account. As per EOS documentation, I used the command below to create a new account: ...
1 vote
1 answer
136 views

Authorization flow in dapps

How authorization works in EOS dapps? I mean in application layer. For example in a trello like application how we manage to just the participants in the project are able to see the tasks?
1 vote
1 answer
147 views

Smart contract error while calling recover_key

Specs I am using the function recover_key from the library crypto.h at the following link: https://github.com/EOSIO/eos/blob/master/contracts/eosiolib/crypto.h Code int compressed_size = ...
1 vote
1 answer
68 views

Can I make a http request from smart contract code?

I know that eosio has http plugins, which is why I'm thinking that maybe a http library is embedded to the eosio.hpp and that I can use it internally to send http requests. Is this possible? My goal ...
0 votes
1 answer
97 views

How can I change quantity in transfer

Good Day!! I want to change add_balance in transfer How can change quantity value in add_balance? Ex) invalid operands to binary expression ('eosio::asset' and 'int') add_balance( to, quantity - 100 , ...
2 votes
1 answer
157 views

Is it possible to deploy contract via curl?

Using command line i am deploying smart contract "eosio.token". cleos -u http://127.0.0.1:8888 set contract eosio.token ./eosio.token -p eosio.token Is it possible to deploy smart contract using ...
3 votes
1 answer
271 views

Deploy Contract from browser using eosjs

so I would like to deploy an EOS contract using eosjs. I encountered several problems (especially with converting the .abi and .wasm files). All the examples either use node (so fs is available) or an ...
1 vote
1 answer
589 views

How to solve !action_type.empty(): Unknown action hi in contract hello?

I am following this doc: https://developers.eos.io/eosio-home/docs/your-first-contract. This is the hello.cpp contract code which is successfully deployed: #include <eosiolib/eosio.hpp> #...
2 votes
2 answers
315 views

A possible alternative sign in/login process instead of firebase auth / amazon cognito using an eos contract?

I had the the idea of a secure alternative login process using an EOS smart contract instead of firebase or Amazon cognito. I would like to know if something like this feasible? My idea is somewhat ...
1 vote
1 answer
464 views

How to use recover function in crypto.hpp to verify signature and public key

I want to sign some data in client using eosjs-ecc.sign() and result is a string like "SIG_K1_KcTmv..." I want to use the recover_key(const checksum256* digest, const char* sig, size_t siglen, char*...
0 votes
1 answer
222 views

Token transfer missing_auth_exception

{ "code":500,"message":"Internal Service Error", "error":{"code":3090004,"name":"missing_auth_exception", "what":"Missing required authority", "details":[{"message":"missing authority of thomsoimj21","...
1 vote
1 answer
335 views

Transfer tokens inside a smart contract from an account to another account

I need to write a simple function that would send tokens using a different account action. Exactly the same situation as in these questions: one and two But I have to use not eosio.token contract but ...
2 votes
2 answers
162 views

How do tokens that pay dividends work?

If a token is created as a standard eosio.token, what are some approaches for paying out dividends to token holders?
3 votes
1 answer
169 views

Execute get_supply function within contract

I want to execute get_supply from currency.hpp. Here is the definition: asset get_supply( symbol_name symbol )const { accounts t( _contract, symbol ); return t.get(symbol).balance; ...
0 votes
1 answer
78 views

Is there a way to mark accounts like give an account a property value?

Let's say I'm making a game character and each eos account is a unique character. Is there a way to mark an account with different properties like strength, speed, durability, etc....
2 votes
1 answer
114 views

How to setup action access control?

Let's say contract-A has a couple of actions defined. If access to one of the contract-A's action, say action1(), needs to be controlled on account basis, how to do it? For example, only few ...
1 vote
1 answer
67 views

Smart contract compiling loop

When I try to compile the contract the process creates an infinite loop. Here is my code, please help! kjnjrwsyxszg.cpp #include "kjnjrwsyxszg.hpp" void kjnjrwsyxszg::create(const name owner,...
0 votes
1 answer
41 views

Immutable smart contract

In EOS, smart contracts can be updated by the account owner. This could be a problem for certain applications in finance. For instance, if I want to deploy a token, the transfer function should be non-...
0 votes
1 answer
117 views

What should I do to specify an optional action parameter for cleos?

I wrote an action that has an optional parameter, as something like: [[eosio::action]] void foo(..., const std::optional<name>& recipient); Then in the generated .abi, it is represented as:...
2 votes
1 answer
356 views

Why does using available_primary_key() as scope for a table result in this behaviour?

Scenario: Two tables, each using uint64_t as a primary key Table A rows need to reference rows in Table B Why? Relational database data duplication reasoning etc etc Both table's primary keys are ...
0 votes
1 answer
56 views

EOSIO failed when using Smart Contract Action with updated Parameters

I deploy a Smart Contract first time and the action becomes usable as it's supposed to be, but when Action's parameters is updated with a new one between existing p1 and p2 old parameters (result: p1, ...
2 votes
1 answer
94 views

Execution order of actions

I want to implement "continious minting" which means first I should call issue, and only then transfer. My contract has a functionality of eosio.token . I call create to create my token with ...
1 vote
1 answer
45 views

Profiling EOS.IO smart contract code

What's the best way for profiling the code of an EOS.IO smart contract? I'd like to know what percentage of the CPU time is spent on executing each function\line (including multi index table function ...
1 vote
1 answer
73 views

I have doubts about intercontract communication

I have read that: In order to call an inline action, that is to call an action of contract A from contract B, there is a need to set some special permission. In this case, the Ram payer for the ...
0 votes
1 answer
71 views

Does EOSIO Have Native Contracts Built-Into Protocol Layer?

On the Bitshares site I read https://bitshares.org/technology/industrial-performance-scalability Based upon the lessons we learn from LMAX, we know that a virtual machine for a blockchain should be ...
1 vote
1 answer
38 views

Eos-sharp jungle Error 3090003 when trying to call external smart contract

I’m trying to achieve something quite simple. I try to call eosio.token transfer from one of my smartContract (lomtaxjungle dopurchase), but after severals days i still don’t manage to do it. From ...
0 votes
2 answers
83 views

Ico smart contract update

I would like to update this code, because it is CDT 1.2. I would like to update for CDT 1.5 or CDT 1.6. What do I need to change? #include <eosiolib/eosio.hpp> #include <eosiolib/currency....
0 votes
1 answer
46 views

Declare custom structs

I am trying to create a custom struct called Student in a contract. Where do I declare or define the struct? I tried to define it in the abi file, but the file was over written when I compile the ...
0 votes
1 answer
150 views

EOS Blockchain How to free up RAM or optimize Smartcontract

We have developed a small program that uses the EOS blockchain and we are storing some of our data in an EOS smart contract. Together with a UUID we are storing the object status. Our goal is to have ...
0 votes
1 answer
54 views

Cleos set contract, Internal Service error timeout_exception

I am running EOS on my laptop. If I execute the "cleos set contract" command and the contract size is more than 200kb, I get an error: error 2021-06-01T17:44:30.084 http-1 http_plugin.cpp:...
1 vote
2 answers
710 views

How to free up used memory

I have this picture for my account memory: quota: 220.4 KiB used: 207.5 KiB I want to free the memory and sellram. Is it possible, and if yes, how to do that?
1 vote
1 answer
83 views

Contract transaction cannot be found after i get result of pushSignedTransaction

I've send a contract trans on mainnet use eosjs@20, and i've tried for 4 times, every time i get a trans result, but all of them seemed been drop, i cannot find them on explorer or on chain, can any ...
1 vote
1 answer
656 views

Duplicate symbol WASM compilation error when using header/hpp for contract

I'm looking to use a hpp file as an interface for multiple contracts. I've created a test contract and receiving a WASM compilation error. I based the test contract on the format used by eosio.token....
0 votes
0 answers
15 views

How to get index of week from time_point_sec(current_time_point())

How to get index of week from time_point_sec(current_time_point()) uint64_t addDay = (86400 * 3); time_point_sec start_at = time_point_sec(current_time_point()); time_point_sec end_at = create_at + ...
0 votes
0 answers
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Smart Contracys - Migration from Ethereum to EOS

I spent a lot of time to develop a number of smart contracts for the Ethereum blockchain, with custom functions I would use for my personal projects. Now I am exploring EOS and I would like to migrate ...
2 votes
1 answer
99 views

Reclaim RAM for dApp that creates an account and transfers funds

A dApp that creates a new account and transfers EOS to that account will have to 'pay' for 240 bytes of RAM for the new balance object on the new account. When the new account transfers some funds, ...

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