json_rpc_snoop

How to build

Ensure you have cargo installed and in your PATH (the easiest way is to visit https://rustup.rs/)

make

This will create the binary in target/release/json_rpc_snoop.

USAGE:
    json_rpc_snoop [OPTIONS] <RPC_ENDPOINT>

ARGS:
    <RPC_ENDPOINT>    JSON-RPC endpoint to forward incoming requests

OPTIONS:
    -b, --bind-address <bind-address>
            Address to bind to and listen for incoming requests [default: 127.0.0.1]

        --drop-request-rate <drop-request-rate>
            odds of randomly dropping a request for chaos testing [0..100] [default: 0]

        --drop-response-rate <drop-response-rate>
            odds of randomly dropping a response for chaos testing [0..100] [default: 0]

    -h, --help
            Print help information

    -l, --log-headers
            Print the headers in addition to request/response

    -n, --no-color
            Do not use terminal colors in output

    -p, --port <port>
            Port to listen for incoming requests [default: 3000]

    -s, --suppress-method <METHOD[:LINES][:TYPE]>
            Suppress output of JSON RPC calls of this METHOD (can specify more than once)

    -S, --suppress-path <PATH[:LINES][:TYPE]>
            Suppress output of requests to the endpoint with this PATH (can specify more than once)

    -V, --version
            Print version information

Example Usage

If you have a JSON-RPC endpoint at http://localhost:8545 and you want to run the proxy on port 8560 and suppress successful eth_getBlockByHash requests you would run:

./target/release/json_rpc_snoop -s eth_getBlockByHash -p 8560 http://localhost:8545

The two suppress options can be specified more than once and can accept a more complicated syntax (run json_rpc_snoop --help to see FULL help output). For example, to limit only the JSON request output to a maximum of 10 lines for requests to the path /eth/v1/builder/validators you would pass:

--suppress-path /eth/v1/builder/validators:10:REQUEST

Example Output