This answer worked when filter.get was not deprecated, but now I am not sure how to do the same thing with subscribe - web3.eth.subscribe hears new events and acts on them after I create the subscription, but I am not sure how to get old events.
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Try this (tested with web3.js v1.2.1):
async function getPastLogs(address, fromBlock, toBlock) {
if (fromBlock <= toBlock) {
try {
const options = {
address : address,
fromBlock: fromBlock,
toBlock : toBlock
};
return await web3.eth.getPastLogs(options);
}
catch (error) {
const midBlock = (fromBlock + toBlock) >> 1;
const arr1 = await getPastLogs(address, fromBlock, midBlock);
const arr2 = await getPastLogs(address, midBlock + 1, toBlock);
return [...arr1, ...arr2];
}
}
return [];
}
...
const latest = await web3.eth.getBlock("latest");
const logs = await getPastLogs(yourContractAddress, 1, latest);
You can further optimize this by replacing 1 with your contract creation block number.
See more on function web3.eth.getPastLogs here.
answered Feb 6 '20 at 20:40
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Thanks, I was able to get an old log doing this - but do you know if it only gives the most recent transaction's event? If I process several transactions (that all emit events) it only ever returns one event (this is doing
logs = await web3.eth.getPastLogs({fromBlock: 0, toBlock: latest})– AndrewFeb 7 '20 at 2:04 -
This might also be a ganache issue as I only see the most recent log in the ganache UI– AndrewFeb 7 '20 at 5:05