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.
618
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Alternative to std::ifstream for eosio contract
I'm watching for an alternative to "std::ifstream" because "#include " can't include as header in a contract.
My code is:
std::istream& operator>>(std::istream& str, ...
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13
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How do I set up EOSIO to make every transaction free of NET/CPU/RAM fee
How do I set up EOSIO to make every transaction free of NET/CPU/RAM fee.
I have checked many system contract code, but still no clue.
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25
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eosio-init command not found
Im trying to create the smartcontracts on the wax-blockchain and i'm following the approach using the docker but it says eosio-init command not found. Is there anyone who can identify the issue from ...
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35
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General Tips on Smart Contract Development? ( Business Logic + Token )
Currently developing an eosio based token with some semi intricate business logic that frequently modifies aspects of the token contract( staking, supply, etc ) based on a variety of factors including ...
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32
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How to get account name of current action?
I am gonna get account name of caller(wallet) in my action of smart contract.
I used functions current_receiver(), get_sender(), get_first_receiver().
but I got contract`s account name and empty ...
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1
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63
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Get table row count or property from the last row
As I said I need to get the count of rows in a table. Preferly via rpc with http plugin or from a new action inside the Smart Contract.
This is my Smart Contract:
#include <eosio/eosio.hpp>
...
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44
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What is the maximum size of smart contract?
I'm developing a smart contract and yesterday I couldn't deploy it into testnet with error:
root@698a02be20d9:/# cleos --verbose set contract myaccount /work/mycontract -p myaccount@active
Reading ...
- 11
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2
answers
35
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Get Action Index (or contract) from inside notification
Is there a way to get the index (ordinal) of the current action that is being processed?
If you could access apply_context you could do get_action_id() but afaik that isn't exposed inside an action.
...
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1
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18
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Efficency of Actions
I am new to smart contracts, and I am developing a smart contract for a game.
I am trying to understand if the smart contract that I created is efficient or not.
I have deployed the smart contract on ...
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1
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37
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How to get name of account which is processing action recent in contract?
I need to authorize with admin table of contract. but I could not account name which is processing action of contract. Let me know about any eos function to get account name, if anyone know well.
...
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62
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Adding Ricardian Clause
I am new to eosio and so far I have been learning using EOS Studio. I have come to the point where I would like to be able to write some Ricardian Clauses in the abi file but EOS Studio does not seem ...
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42
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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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1
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39
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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 ...
- 109
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1
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30
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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 can't create a new account. As per EOS documentation, I used the command below to create a new account:
...
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141
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How to deploy a smart contract on the mainnet?
I created and tested my smart contract on testnet.
Now I want to deploy it on mainnet, I assume I have to purchase some EOS token and buy ram, cpu and net... I can't find anything in the docs about ...
- 131
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41
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confusion with contract names and account names in eosio testnet
When writing contracts, the contract class in file name_a.cpp is defined as follows:
class[[eosio::contract("name_a")]] name_b : public contract {..}
In my understanding the name of the ...
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2
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1
answer
107
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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 ...
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52
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How to link an external library to my eosio smart contract?
I normally use eosio-cpp to compile my smart contract, but recently I needed to use an external lib and link to it to build my project.
I checked the docs here, but it basically shows how to use cmake ...
- 131
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45
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how can i pass array of integers to smartcontract action using SwiftSDK
I have following action in my smartcontract:
ACTION uploadfile1 (name creator, vector<uint8_t> content, string filename)
I'm trying to push action from my Swift application using following code:...
- 21
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1
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56
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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-...
- 101
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65
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Is there a max stack depth in EOSIO?
For ethereum it is 1024, is there one for EOSIO, if so what is it?
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36
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Caller of action detail in code
I need to check Account of caller action ,as in ethereum we have a concept of msg.sender to get the caller eth_address, similar is there a way to get caller of action details in EOS.
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WAX - Signature error : "Message: transaction declares authority, but does not have signatures for it."
I'm trying to send a transaction from my react frontend to local chain, I have signed in wax cloud wallet and made a transaction. But at last I met this signature error.
"Message: transaction ...
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1
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53
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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:
...
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1
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1
answer
32
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cdt1.8.1 compile issue
error encountered when compile the contracts with cdt 1.8.1, any idea?
/usr/local/Cellar/eosio.cdt/1.8.1/opt/eosio.cdt/bin/../include/boost/pfr/detail/core17_generated.hpp:38:9: error:
type 'swaps_row'...
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1
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73
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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, ...
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1
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179
views
Is it allowed to look up tables of another contract?
Imagine if I have an account with contract. Is it allowed for me to look up tables of some another contract from my contract action?
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1
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104
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Passing struct as a parameter to smart contract action
I want to save data in the blockchain table whose format is as below:
{
"docsample": {
"id": 1,
"creationDate": "2012-05-16T18:25:43.511Z",
"...
- 307
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2
answers
362
views
How to call Wax action in PHP
All of the tutorials on building dApps, they use Javascript and then they tell you how NOT to do it by using your PK to create a signature.
So I'd like to use PHP on the backend and grab my key from a ...
- 101
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86
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:...
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1
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89
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Traverse multi-index table through non-primary value and delete the record
Below is my smart contract:
#include <eosio/eosio.hpp>
#include <eosio/print.hpp>
#include <eosio/system.hpp>
#include <string>
using namespace eosio;
using std::string;
...
- 307
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123
views
Can a smart contract perform actions on a scheduled delay indefinitely?
I am pretty new to working with EOS, so please excuse my ignorance and improper terminology.
I am trying to repeatedly excecute a given action on a set time delay. For example, trying to submit a ...
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0
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34
views
Build existing autoconf C project to include in smart contract
I'd like to include GNU's GMP library in my smart contract project.
It's an autotools/autoconf project, how can I compile it as a standalone webassembly library and then include it in my smart ...
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1
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163
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Tables of a smart contract: public or private?
I was wondering about the ramifications of having tables declared public. Since EOSIO is a transparent blockchain anyone can read tables of any contract. So having them declared public in a smart ...
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71
views
How much RAM does a smart contract consume?
I have a smart contract compiled resulting in a 10,961 Bytes wasm file and a 2,372 Bytes abi file. However, when deploying the contract on chain it consumes about 110,000 Bytes which is almost 10x the ...
- 144
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1
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73
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Compiling smart contract not getting done
I have a setup of multi-node of 4 peers blockchain. Blockchain is running, few days before I deployed the smart contract and using it to save data on the blockchain. Now, I did some changes to the ...
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1
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83
views
Using a smart contract table. How can I query a row using another field instead of the primary key id?
How can I query a smart contract table to return a row instead of using the primary key id?
I have the following: https://jungle.bloks.io/account/mybest111111?loadContract=true&tab=Tables&...
- 2,257
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2
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50
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how to make sure the tx to be included in block
as subject, any way to make sure the tx to be included in block, what i think of is, if the tx meet the condition, then notify the contract to execute the specified action, otherwise notify an account ...
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3
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139
views
on_notify does not get triggered
I am using a very simple example:
mycontract.hpp:
[[eosio::on_notify("eosio.token::transfer")]]
void depos(name from, name to, asset quantity, string memo);
mycontract.cpp:
[[eosio::...
- 171
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1
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77
views
Issues regarding the update of a staking contract
Suppose that we need a token staking mechanism (similar to the stake and lock function introduced in the EOSIO training). Someone owns that contract. Now the question is:
How would the rest of the ...
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1
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1
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113
views
How to access data inside multi-index table when using 2D vector / 2D array?
What is going on? :D I write data, but cannot find it after I write it.
The following code successfully emplaces the row into the multi-index table:
See specifically the vector<vector <...
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0
answers
21
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getting error when i try to add permission to a user who is signing a smart contract action
here is what i am trying to do :
users will sign a specific action which will take their username, permission_name, smart_contract_name, action_name, public_key
i am trying to assign the user ...
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31
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How can i update a table by TransactionID? And can transactionId be the same when we update the data?
I am running my nodeos on my local machine, I can retrieve all the data via api and do some CRUD also. I have succeeded update the table by tableId,
But can someone suggest to me how do I update the ...
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1
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119
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nested stuff inside index_table
I'm trying to build a small hearthstone like game and I've finished up the front-end for the game client. I created a NoSQL mockup of the user data and now it's time to move those to the index_table ...
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51
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How check deferred transaction logs on EOS jungle testnet?
As I working on jungle testnet and perform a 1 deferred transaction with some scheduled automatic time. But I failed to see transaction logs on the jungle testnet.
Can any please guide me here with ...
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43
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How to get table data from Jungle testnetwork?
I am trying to get all the insert data using get table on jungle testnet. But I was failed and get only an empty row value.
command:
cleos --url https://jungle3.cryptolions.io:443 get table ...
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21
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How to set a eos contract on jungle network [duplicate]
As I trying to deploy a contract on Eos Jungle test network using cmd. But I failed to run.
Command :
cleos --url https://jungle3.cryptolions.io:443 set contract tulsipadalia addressbook -p ...
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3
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3
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511
views
Set source file properties called with incorrect number of arguments
When attempting to compile a new contract, I am getting this error. I'm using eosio version 2.1 for this.
CMake Error at /home/michael/eosio.cdt/build/lib/cmake/eosio.cdt/EosioCDTMacros.cmake:18 (...
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42
views
Where are accounts and smart contracts stored?
I'm a bit confused by answers to the following questions:
Where are new accounts stored?
Where is the smart contract is stored
How can everything be stored on RAM at all time? 3KB for each user means ...
- 171
3
votes
1
answer
230
views
Returning values from actions
I am trying to return a value from an action as follows:
[[eosio::action("test2")]] int test2(int x)
{
return x;
}
The code compiles correctly, and the ABI file shows the correct action ...
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