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ethereum/light-client

https://github.com/zsfelfoldi/go-ethereum/wiki/Geth-Light-Client

People

Repo info

Activity

Rocky Fikki

@rfikki

max peers 0?

agatsoh

@agatsoh

@rfikki I could get it working. I added maxpeers 0 because there was a comment regarding that on the gist. But all good.
It took a long time to connect with peers though

Subik Shrestha

@sssubik

Hey can I use a light client to invoke a smart contract function from the backend by providing private keys and not from wallet?

multisiglab

@multisiglab_twitter

Hi guys, we have a huge problem, our clients so angry. We can not make bunch withdrawal due to problems with our Geth nodes, please help us.

Light node is constantly looking for peers and has peercount=0, even if we add peers manually by admin.addPeer(), it doesn’t work, admin.peers empty. How it could be resolved?

Geth 1.9.17 version (and 1.9.16 has the same issues)

@evertonfraga

there aren’t enough light servers on the network, so light clients tend to be without peers.

multisiglab

@multisiglab_twitter

thank you for useful response!

my team says sometimes it happen with full node also

multisiglab

@multisiglab_twitter

Hi everyone, can you help me understand please, is the LES implementation compatible with PLP? I mean is the parity node can serve geth light node?

@evertonfraga

they are different protocol implementations, with different identifiers: “les/2” vs “plp/1”

https://github.com/ethereum/devp2p/blob/master/caps/pip.md for more

multisiglab

@multisiglab_twitter

thanks a lot!

Adam Ryczkowski

@adamwam_gitlab

Since servers willing to speak LES are scarce, what are my options to commit basic transactions on ETH main net without trusting 3rd party?

Adam Ryczkowski

@adamwam_gitlab

I believe I found the solution. geth --syncmode "light"connects successfully (in contrast to the deprecated Fether), and so I can use: https://support.mycrypto.com/developers/run-your-own-node-with-mycrypto

OliverBui

@OliverBui

Hello all, i have just upgrade my light Node to 1.9.19-stable

but have no peers, how can i config my Node to connect other peers?

sunnelimmune

@sunnelimmune

Bitcoin is going down, I cannot mine again and I just swapped my bitcoin to bitcoin cash, how best is my decision?

Though thinking of mining from https://fxctraders.com/bitcoin-mining/

Alexandre Esteves

@alexfmpe

Is there a way to output a transaction or receipt inclusion proof out of geth? I can only find an endpoint for state proofs: ethereum/go-ethereum#17737

方平

@fpChan

hello， I want to have a light client which only contain bolck header data, How can I get the bolck header data from full node.

I want sync the block header data from peers

Mikko Ohtamaa

@miohtama

Hello all. I am checking what's the current status of Ethereum light client in Go and is it under active development?

I am checking it it is possible to implement an Ethereum bridge in other Go based blockchains (all Tendermind ones) by using this model how Rainbow bridge is operationg: https://near.org/blog/eth-near-rainbow-bridge/

you need a light client to check the proofs of events happening in another network

Alexandre Esteves

@alexfmpe

@miohtama I've worked in a on-chain Rust ethereum light client which is partially based in rainbow bridge.
The main things you want to watch for are transaction size limit, gas limits and latency.

We could fit less than 16 ethash DAG elements in one transaction so we had to send them in chunks - this ballooned the number of transactions needed to relay a single ethereum header which in turn means that to stay below ethereum's block rate you need to relax the commitment parameters and submit them more optimistically and/or make the light client accept chunks in any order and keep track of which chunks were missing so that you can send them in barrage.
Rainbow bridge uses https://github.com/tranvictor/ethashproof for the ethash merkelization, and this takes ~3 seconds per block on my machine (though you can cache things in advance if you need)

You also need to do a bunch of keccak 256/512 for ethash verification, so that might require primitives to avoid hitting the gas limit

I can't tell by your message whether you want Go specifically, but there are Tendermint/Cosmos SDK ports to other languages - I've used an Haskell one in the past

Meaning, there's probably a Rust Tendermint SDK you could use and leverage a good deal of rainbow bridge directly

Mikko Ohtamaa

@miohtama

@alexfmpe Thank you so much

This is especially embedding a Ethereum light client in TenderMind based chains (all Go)

Mikko Ohtamaa

@miohtama

And in my case might not need to be onchain, so it could make things easier

I only need to verify event logs in a Go based program

one way

Mikko Ohtamaa

@miohtama

This seems to be very easy to read https://github.com/zmitton/eth-proof

Manjiri Birajdar

@ManjiriBirajdar

Hi, I am asking because I am trying to understand, can geth light client communicate with another geth light client in secure way? If yes, then how? Any links for reference?

Mikko Ohtamaa

@miohtama

@ManjiriBirajdar light clients are connected to full nodes, not peer-to-peer

so any communication would need to happen over Ethereum transactions (expensive)

alesito85

@alesito85

Hi, is there a particular way that geth light sync needs to be run nowadays? Mine doesn't connect to any peer for a long time

vladyslavmunin

@vladyslavmunin

@alesito85 which network do you run ? I faced with this problem on ropsten network. Couldn't find any peer for several hours. Got lucky to find this peer enode://23fd0ff45034abb96933c07b4fa9e2aff5029f78ec27a425a2547990b59cffb1e8f87b6ae4a88d2fc4b6f3d57b67673fa3d4df1c893f2cc72ddf37ef75c21a00@178.128.242.69:30303

for main network all works fine

there are opened to light client nodes

alesito85

@alesito85

@vladyslavmunin interestingly enough my issue is on mainnet

alesito85

@alesito85

Fyi I've resolved my issue by using Linux client instead...

alesito85

@alesito85

Actually it turns out that I have issues with the latest client everywhere (1.9.24). I've tried 1.9.11 and that one connects almost immediately

Jamesmorgan0233

@Jamesmorgan0233

Hello friends

janke

@janke99

hi, is there anyone know how can i subscribe pending transaction by light client?

Ｈａｓｅｅｂｏｙ

@SyedhaseebSaeed_twitter

@SyedhaseebSaeed_twitter
hi there I'm facing a issue when making request to geth node
curl: (7) Failed to connect to 39.53.117.254 port 8545: Connection refused
I'm getting this error please help. Thanks in advance

Oliver Bernie

@OliverBernie1_twitter

Hello everyone

Petrovichev Sergey

@petrovi4ev

Hello! What are the differences between the ethereum full node and the light node? I am interested in specific functionality, that is, generating addresses, obtaining information about a transaction by hash, etc. Is there any functionality that can be lost when switching to a light node?

1 reply

jarlab-dev

@jarlab-dev

Hi,
testing

geth --syncmode light ...
working ok, synchronization taking some few minutes.
However when closing client and restarting it, finding following issue that cannot solve by now, without a fresh (on clean datadir) resync
... err="block in the future"

Main concern is that always having a fresh light sync will eventually miss i.e transactions done today in say 1 month (assuming that's the time window for light mode)
Please, looking for advice for workaround

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