I am running in a private ethereum network which I init with a genesis.json file that contains
"gasLimit": "31415926"
Now I am wondering how I can read that via web3, any suggestions? (I want to make sure the limit is set correctly).
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2 Answers
Asking for the last block mined, it will return the gasLimit of the block https://github.com/ethereum/wiki/wiki/JavaScript-API#web3ethgetblock
var block = web3.eth.getBlock("latest");
console.log("gasLimit: " + block.gasLimit);
Note for web3 v1.x: getBlock is an async function and you have to use await to get the expected result
var block = await web3.eth.getBlock("latest");
console.log("gasLimit: " + block.gasLimit);
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2The gas limit I am getting from this is absurdly high (For an individual transaction), but this is the gas limit for the whole block though, correct? If so, then to estimate the gas I should use on an individual transaction, do I just divide by the number of transactions in said block? Or is it safe to just always use the gasLimit minimum of 21000? Dec 12, 2018 at 1:28
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1@rsc05 You need to wait the function returns: await block.gasLimit Jan 10, 2022 at 5:47
Here is the exact answer:
var block = await web3js.eth.getBlock("latest");
var gasLimit = block.gasLimit/block.transactions.length;
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The block gasLimit total is always about 30000000, but the number of transactions is variable in each block. Sometimes 1, sometimes 6..... the gasLimit is so different in each case if I take your division by the trx length– JTConApr 26, 2021 at 15:54
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1For python code, it should be
gas_limit = int(latest_block.gasLimit / (1 if len(latest_block.transactions) == 0 else len(latest_block.transactions)))Sep 7, 2021 at 13:44 -