Web3-proxy: a fast caching and load balancing proxy for web3 (Ethereum or similar) JsonRPC servers.

Last update: Jan 8, 2023

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Overview

web3-proxy

Web3-proxy is a fast caching and load balancing proxy for web3 (Ethereum or similar) JsonRPC servers.

Signed transactions (eth_sendRawTransaction) are sent in parallel to the configured private RPCs (eden, ethermine, flashbots, etc.).

All other requests are sent to an RPC server on the latest block (alchemy, moralis, rivet, your own node, or one of many other providers). If multiple servers are in sync, they are prioritized by active_requests/soft_limit. Note that this means that the fastest server is most likely to serve requests and slow servers are unlikely to ever get any requests.

Each server has different limits to configure. The soft_limit is the number of parallel active requests where a server starts to slow down. The hard_limit is where a server starts giving rate limits or other errors.

$ cargo run --release -p web3-proxy -- --help

   Compiling web3-proxy v0.1.0 (/home/bryan/src/web3-proxy/web3-proxy)
    Finished release [optimized + debuginfo] target(s) in 17.69s
     Running `target/release/web3-proxy --help`
Usage: web3-proxy [--port ] [--workers ] [--config ]

Web3-proxy is a fast caching and load balancing proxy for web3 (Ethereum or similar) JsonRPC servers.

Options:
  --port            what port the proxy should listen on
  --workers         number of worker threads
  --config          path to a toml of rpc servers
  --help            display usage information

Start the server with the defaults (listen on http://localhost:8544 and use ./config/example.toml which proxies to a local websocket on 8546 and ankr's public ETH node):

cargo run --release -p web3-proxy

Check that the proxy is working:

curl -X POST -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"web3_clientVersion","id":1}' 127.0.0.1:8544

You can copy config/example.toml to config/production-$CHAINNAME.toml and then run docker-compose up --build -d start a proxies for many chains.

Flame Graphs

Flame graphs make finding slow code painless:

$ cat /proc/sys/kernel/kptr_restrict
1
$ echo 0 | sudo tee /proc/sys/kernel/kptr_restrict
0
$ CARGO_PROFILE_RELEASE_DEBUG=true cargo flamegraph

GDB

Run the proxy under gdb for advanced debugging:

cargo build --release && RUST_LOG=web3_proxy=debug rust-gdb --args target/debug/web3-proxy --listen-port 7503 --rpc-config-path ./config/production-eth.toml

Load Testing

Test the proxy:

wrk -s ./data/wrk/getBlockNumber.lua -t12 -c400 -d30s --latency http://127.0.0.1:8544
wrk -s ./data/wrk/getLatestBlockByNumber.lua -t12 -c400 -d30s --latency http://127.0.0.1:8544

Test geth:

wrk -s ./data/wrk/getBlockNumber.lua -t12 -c400 -d30s --latency http://127.0.0.1:8545
wrk -s ./data/wrk/getLatestBlockByNumber.lua -t12 -c400 -d30s --latency http://127.0.0.1:8545

Test erigon:

wrk -s ./data/wrk/getBlockNumber.lua -t12 -c400 -d30s --latency http://127.0.0.1:8945
wrk -s ./data/wrk/getLatestBlockByNumber.lua -t12 -c400 -d30s --latency http://127.0.0.1:8945

Note: Testing with getLatestBlockByNumber.lua is not great because the latest block changes and so one run is likely to be very different than another.

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Comments

investigate fee estimation being low

A user reported that they had several transactions run out of gas after switching to LlamaNodes. Investigate if they just got unlucky or if there are some flags we can tune. I have a suspicion this is just a coincidence.

I have had gas estimation be low using nodes before. Brownie defaults to increasing estimates by 20% or 30% because this was such a common problem.

opened by WyseNynja 4
double check archive stat dashboard

https://eth.llamarpc.com/user/stats/detailed

make sure archive requests are being grouped on properly. it should be a bool, not an int. or if it is an int, it should be joined with the non-archives

opened by WyseNynja 1

Handle very large, very slow responses

I tried to run a debug_traceBlockByNumber using this tool connected to Erigon over WebSocket and this is the result:

2022-06-20T16:33:54.300492Z DEBUG proxy_web3_rpc: web3_proxy::app: Received request: Single(JsonRpcRequest { id: RawValue(1), method: "debug_traceBlockByNumber", .. })
2022-06-20T16:34:04.306695Z  INFO block_receiver: web3_proxy::connections: new head: 0xb685…c903 rpc=Web3Connection { url: "ws://192.168.10.50:8544", .. } new_block_num=14997562
2022-06-20T16:34:04.306775Z DEBUG block_receiver: web3_proxy::connections: all head: 0xb685…c903 rpc=Web3Connection { url: "ws://192.168.10.50:8544", .. } new_block_num=14997562
2022-06-20T16:34:05.584122Z  INFO block_receiver: web3_proxy::connections: new head: 0xa4c2…1217 rpc=Web3Connection { url: "ws://192.168.10.50:8544", .. } new_block_num=14997563
2022-06-20T16:34:05.584163Z DEBUG block_receiver: web3_proxy::connections: all head: 0xa4c2…1217 rpc=Web3Connection { url: "ws://192.168.10.50:8544", .. } new_block_num=14997563
2022-06-20T16:34:05.584188Z  INFO block_receiver: web3_proxy::connections: new head: 0xc373…8483 rpc=Web3Connection { url: "ws://192.168.10.50:8544", .. } new_block_num=14997564
2022-06-20T16:34:05.584201Z DEBUG block_receiver: web3_proxy::connections: all head: 0xc373…8483 rpc=Web3Connection { url: "ws://192.168.10.50:8544", .. } new_block_num=14997564
2022-06-20T16:34:12.572834Z  INFO block_receiver: web3_proxy::connections: new head: 0xdf46…b691 rpc=Web3Connection { url: "ws://192.168.10.50:8544", .. } new_block_num=14997565
2022-06-20T16:34:12.572867Z DEBUG block_receiver: web3_proxy::connections: all head: 0xdf46…b691 rpc=Web3Connection { url: "ws://192.168.10.50:8544", .. } new_block_num=14997565
2022-06-20T16:34:54.303245Z  WARN web3_proxy::frontend::errors: Responding with error: JsonRpcForwardedResponse { id: RawValue(null), .. }
2022-06-20T16:35:11.120685Z ERROR ethers_providers::transports::ws: err=Protocol(ResetWithoutClosingHandshake)
2022-06-20T16:35:11.120834Z ERROR ethers_providers::transports::ws: WebSocket connection closed unexpectedly
2022-06-20T16:35:11.121147Z  WARN subscribe_pending_transactions: web3_proxy::connection: subscription ended
2022-06-20T16:35:11.121173Z  WARN subscribe_new_heads: web3_proxy::connection: subscription ended
2022-06-20T16:35:11.121275Z  WARN web3_proxy::connections: block_receiver exited!
2022-06-20T16:35:11.121334Z  INFO web3_proxy::connections: subscriptions over: Web3Connections { inner: [Web3Connection { url: "ws://192.168.10.50:8544", .. }], .. }
2022-06-20T16:35:11.121405Z  INFO web3_proxy: app_handle exited x=Ok(())

On the cURL side:

curl -X POST -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"debug_traceBlockByNumber","params":["latest"],"id":1}' 127.0.0.1:8544
{"jsonrpc":"2.0","id":null,"error":{"code":-32099,"message":"deadline has elapsed"}}

I then tried with a specific block number just so it would be reproducible, and this time the issue was with the response size specifically:

2022-06-20T16:39:33.588660Z DEBUG proxy_web3_rpc: web3_proxy::app: Received request: Single(JsonRpcRequest { id: RawValue(1), method: "debug_traceBlockByNumber", .. })
2022-06-20T16:39:38.092209Z ERROR ethers_providers::transports::ws: err=Capacity(MessageTooLong { size: 526286051, max_size: 16777216 })
2022-06-20T16:39:38.092242Z ERROR ethers_providers::transports::ws: WebSocket connection closed unexpectedly
2022-06-20T16:39:38.092393Z  WARN subscribe_new_heads: web3_proxy::connection: subscription ended
2022-06-20T16:39:38.092462Z  WARN proxy_web3_rpc: web3_proxy::connections: Backend server error! self=Web3Connections { inner: [Web3Connection { url: "ws://192.168.10.50:8544", .. }], .. } e=oneshot canceled
2022-06-20T16:39:38.092496Z  WARN subscribe_pending_transactions: web3_proxy::connection: subscription ended
2022-06-20T16:39:38.092532Z  WARN web3_proxy::connections: block_receiver exited!
2022-06-20T16:39:38.092569Z  INFO web3_proxy::connections: subscriptions over: Web3Connections { inner: [Web3Connection { url: "ws://192.168.10.50:8544", .. }], .. }
2022-06-20T16:39:38.092774Z  INFO web3_proxy: app_handle exited x=Ok(())

curl -X POST -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"debug_traceBlockByNumber","params":["0xE4D849"],"id":1}' 127.0.0.1:8544
curl: (52) Empty reply from server

It does work testing Erigon directly with websocat

opened by quickchase 2