Questions tagged [ganache]

For questions about using the Ganache personal blockchain testing environment.

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20
votes
3answers
11k views

Difference between Ganache and Truffle

What is the difference between this two? I understand that Ganache is like a fake blockchain, but Truffle has that too ? What are the limitations of each and under which circumstance we use either ...
16
votes
1answer
9k views

Member function “transfer” not found or not visible after argument-dependent lookup in contract?

I am having a problem with my smart contract making value transfers. My current environment: Truffle v5.0.0-beta.2 (core: 5.0.0-beta.2) Solidity v0.5.0 (solc-js) Node v8.11.1 I created the ...
13
votes
2answers
4k views

Truffle's Ganache VS Testrpc

Is there any major difference between Truffle's Ganache and TestRPC? Do they run irrespective of each other as test blockchains, are there any side effects running both at same time? Is the only ...
6
votes
1answer
4k views

Setup Ganache with Metamask. What and where is a Chain ID?

I am following these instructions. The problem is that the above instructions don't mention Chain ID and it appears Chain ID is required to even make it work. Thus, I'm stuck. What is the Chain ID? ...
6
votes
1answer
1k views

Is there a maximum number of public functions in a contract?

I have two contracts A and B, both deploy and work correctly in ganache (they both use less than 6M gas). Now I want to create a third contract C that inherit both A and B. contract C is A, B { } ...
6
votes
2answers
2k views

How to properly simulate mining time with Ganache CLI

I am using the Ganache CLI for testing my smart contracts and frontends. I need a way to incorporate a delay into ganache-cli when performing write transactions in order for it to more closely ...
5
votes
2answers
4k views

Solidity Exceeds block gas limit during Mocha Tests with Ganache-cli

How can I increase the gas limit in this case? The error message is "n: Exceeds block gas limit" or "base fee exceeds gas limit". I think there is some kind of api I need to set the block gas limit ...
5
votes
1answer
2k views

Can we see events in ganache?

I am using Ganache and wanted to understand where can we see the events in the Ganache UI. I tried checking the events in the transaction and logs tab but I did not find it. Here is one sample code. ...
5
votes
4answers
2k views

The endpoint returned a different chain ID: 0x539 (Ganache)

I am trying to connect Metamask to ganache by creating a custom RPC with the following details: New RPC URL: HTTP://127.0.0.1:7545 Chain Id: 5777 But I keep getting the error message The endpoint ...
5
votes
1answer
676 views

Web3.js + ganache local development: Response to preflight request doesn't pass access control check, CORS error

I am fairly new to DAPP and I am trying to follow an online guide building my first smart contract. Here's the source code: Election.sol pragma solidity ^0.4.2; contract Election { string ...
5
votes
1answer
358 views

Can't debug transactions that fail during the Web3.js estimateGas() call? No Tx Hash

NOTE: I am doing my work with the Ganache v1.2.2 GUI client on a Linux Ubuntu 18.04 station. There are many revert errors that happen during the estimateGas() call that precedes the actual Web3.js ...
4
votes
1answer
4k views

How to get private keys on Truffle from Ganache accounts

Doing some ERC-735 tests on truffle+ganache I got stuck when creating claim signatures. They need to be signed from my ganache account, but I don't know its private key. The code to be used is this: ...
4
votes
1answer
2k views

Attach to ganache-cli using geth

Is it possible to attach with geth to ganache-cli? I start ganache-cli like this: ganache-cli --db ~/ganache -i 15 Then I try to attach to the chain like this: geth --datadir ~/ganache/ --...
4
votes
2answers
962 views

Solidity Error: Exceeds block gas limit

When I start ganache-cli in one terminal window and run ./node_modules/.bin/solidity-coverage (command from documentation) in another I get Error: Exceeds block gas limit at Object....
4
votes
4answers
563 views

Truffle Drizzle-box fails with TypeError: (0 , _drizzle.generateContractsInitialState) is not a function

Right after unboxing Drizzle-box I'm getting a TypeError: (0 , _drizzle.generateContractsInitialState) is not a function. Ganache is running on localhost:8545, contracts are deployed, Metamask ...
4
votes
1answer
346 views

Time-dependent tests with Hardhat?

For Ganache, there are several solutions. What about Hardhat? They implemented their own local blockchain, Hardhat Network, which is different to Ganache.
4
votes
1answer
713 views

Ganache + Truffle: how to deploy a contract without considering the gas

I am working with Ganache and Truffle. I am trying to deploy kind of a huge smart contract, but most of the functions in this smart contract are pre-prod functions, so I do not really worry about real-...
4
votes
2answers
808 views

How to compile Solidity ^0.5.5 contract with Node.js?

I am terribly new in Solidity and now I try to learn how to compile a contract in Solidity ^0.5.5 (No versions below). I have the contract as follow (UsersContract.sol) pragma solidity ^0.5.5; ...
4
votes
1answer
3k views

web3js sender account not recognized

Under Ganache, I created some APIs with nodejs to managing a Smart Contract. One API is for the creation of new accounts with newAccount = web3.eth.accounts.create(web3.utils.randomHex(32)); Then, ...
4
votes
2answers
196 views

How to test a function call that should fail?

Im using Truffle to test my smart contracts written in Solidity and I would like to mark test as passed if function call/execution fails. Example: await instance.cancelOrder({from: accounts[1]}); ...
4
votes
0answers
297 views

`eth_getTransactionReceipt` returns the transaction hash not the receipt

I use sol-coverage in a truffle project. Ganache is my development blockchain. I have a lot of tests which end up doing more than a few thousand JSON RPC calls. Due to unbeknownst reasons, the ...
4
votes
0answers
94 views

Does 'estimateGas' behave the same on Ganache and on mainnet?

I noticed that estimateGas behavior in Ganache has changed: In version 6.4.1, it throws an exception if exceeding the gas-limit. In version 6.5.1, it returns the estimation even if exceeding the gas-...
4
votes
1answer
170 views

What can be the difference between Remix VM, Ganache win, ropsten?

I cannot share the code, but in short something based on a payable fallback in a complicated multi contract application has this behavior: 1) tested in remix using VM: perfect 2) tested in remix on ...
4
votes
1answer
453 views

Remix + Ganache - Cannot call one contract from another

I have an innocent looking contracts that work painlessly in Remix. Test contract can easily call Another if I use JavaScript VM in Remix. I also have ganache-cli running on port 7454. If I connect ...
4
votes
0answers
420 views

How to Catch Connection Issues to Web3 Provider using Web3.js

My node.js script is able to successfully connect to the Web3 provider when both the private key (using truffle-privatekey-provider) and the provider host URL are correct. let privateKey = ..., ...
3
votes
1answer
965 views

ganache-cli doesn't have enough funds to send tx – number increases proportionally to however much I initialize a wallet with

I'm trying to write a simple function to send a transaction using web3 and ethereumjs-tx that empties the wallet of an account (call this account A) into another account (account B). However, no ...
3
votes
1answer
229 views

Difference between Puppeth and Ganache

I am trying to set up a local blockchain and started to read about Puppeth to manage the blockchain and also read about Ganache (this one I already tested a bunch of stuff), but never heard about a ...
3
votes
1answer
139 views

Can the block number be set back in ganache?

I know about tools like ganache-time-traveler that let you advance the block number. But is it possible to go back to a lower value?
3
votes
1answer
949 views

How do I work with the latest version of solidity?

A new version of Solidity was added fairly recently, and one of the feature it adds is messages on require. I would like to use them but I'm not sure how I can do that. I'm using Ganache and truffle, ...
3
votes
1answer
58 views

Ethereum Signing using HSM

I tried signing a Message using the SHA256withECDSA algorithm . It gives a different signed(r,s) output everytime. When i try to recover the address using the ecrevover method .it gives me a different ...
3
votes
2answers
480 views

Ganache Processing becomes very slow (with Automining Option) after consecutive thousands transactions

I am trying to deploy thousands of contracts on Ganache GUI. At first, it process all transactions very fast (deploy contracts and transactions for calling setters functions) . After some transactions,...
3
votes
1answer
357 views

Can't send data to non-contract address using web3 1.0.0 and ganache

Problem According to this question, it is possible to send data to a non-contract address in Ethereum. However, if I run my code which sends ether from the first account to the second account on ...
3
votes
1answer
975 views

Ganache/Web3: “Key not found in database”

I am using Ganache CLI v6.1.0 (ganache-core: 2.1.0)) (started with default settings by running simply ganache-cli), web3 (^1.0.0-beta.33), and my smart contract is written for solidity ^0.4.0. I have ...
3
votes
2answers
591 views

Signing transactions with Ledger Nano S on Ganache with Metamask

I am trying to sign transactions and move funds on a private Ethereum Blockchain with my Ledger Nano S on MetaMask. So far I have tried to do so in Ganache and via blockchain setup via custom RPC. ...
3
votes
1answer
105 views

Error when deploying contract having struct with many strings

I am using Truffle with Ganache and MetaMask. I have a struct in my contract containing many fields as string data type struct User { string firstName; string lastName ...
3
votes
1answer
296 views

Web3.py Could not transact with/call contract function, is contract deployed correctly and chain synced?

I am trying to call a contract function deployed in Ganache. I am pretty sure the contract is deployed because I can transact() and work with other functions. But when I call() it, I get this error: ...
3
votes
2answers
403 views

Metamask injects one account in web3, but calls contracts using another account

Building a React app, MetaMask injects web3, I get accounts[0] from getAccounts(), then pass it to my contract functions together with other parameters. I want my modifiers to lock incoming function ...
3
votes
1answer
560 views

Why do truffle compile or migrate commands fail silently?

Truffle v5.0.3 config: truffle-config.js module.exports = { // See <http://truffleframework.com/docs/advanced/configuration> networks: { development: { host: "127.0.0.1", //also ...
3
votes
0answers
287 views

Truffle test of two transactions during the same block

I'm trying to test a solidity function that only allows it to be called once per block. E.g. (my desired functionality): Tx1 calls Fn during block #100, and when successful sets a boolean flag for ...
3
votes
1answer
765 views

Error Ganache: Run out of gas - Works in Remix/Not from dApp

I am working on an application that stores and retrieves personal data on/from the ethereum blockchain. Just working on this to improve my Solidity and SC expertise and get comfortable with the ...
3
votes
0answers
234 views

Difference between execution costs on remix an Ganache?

I created a contract on remix and then deployed it. when I call any function there is an execution cost in gas. I also deployed the same contract on Ganache for testing. I find the execution cost in ...
3
votes
0answers
430 views

Mnemonic and HD Path in Ganache and ethereumjs-tx gives different private key and address

I am having difficulty reproducing the private key and address using the mnemonic and HD path provided by Ganache. Mnemonic weird farm vast surge upper truth answer end radar impact mind jeans HD ...
3
votes
2answers
208 views

Check your gas amount error ERC721

I am trying to deploy contracts to Ganache for testing using Truffle, but no matter what I set gas price / gas limit / gas to both in truffle.js and Ganache itself, it always get check gas amount on ...
3
votes
2answers
780 views

Ganache (UI) save blockchain

I am running a testnet on Ganache UI. But when I deploy a contract and close and reopen ganache, there are no blocks and the contract deployment is gone. Is it possible to save/load a blockchain ...
2
votes
3answers
743 views

Increase block number on Ganache

How can we increase block.number on Ganache for testing purpose ? If not possible do you know an alternative like passing X fake transactions to artificially increase block.number. Or if we have to ...
2
votes
2answers
487 views

How truffle selects the address with which it deploys a smart contract with and where does it gets it's private keys?

I am reading truffle tutorials for deployment smart contract to gauche, I've never deployed any smart contract to real network. Now when migrate (deploy) a smart contract I get these info: ...
2
votes
2answers
448 views

Understanding ganache timestamps

Sometimes, when I use the ganache specific evm_increaseTime method and advance to the next block, the next timestamp is NOT: current timestamp + advanced time But instead: current timestamp + ...
2
votes
3answers
730 views

Want to run a local fork of Ropsten

I would like to run a local fork of Ropsten to interact with some of the smart contracts without having to fill up from the tap. My plan was to start a light parity node as follows: parity --chain ...
2
votes
2answers
993 views

Truffle test error: Cannot create instance of Vault; no code at address

I'm trying to make a simple test in Truffle using Ganache where I call a function from a smart contract instance. This component will create a Vault and return me its address. My truffle test does ...
2
votes
2answers
1k views

How can I select a single account in Ganache? [duplicate]

Ganache (v1.2.3) provides a list of 10 accounts. They can be easily selected by selecting web3.eth.getAccounts();. However web3.eth.accounts[0] returns undefined as shown below. Not sure how to ...

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