Opera

EVM-compatible chain secured by the Lachesis consensus algorithm.

Opera transaction tracing node

Node with implemented OpenEthereum(Parity) transaction tracing API.

make opera

The build output is build/opera executable.

Running opera

Going through all the possible command line flags is out of scope here, but we've enumerated a few common parameter combos to get you up to speed quickly on how you can run your own opera instance.

Launching a network

You will need a genesis file to join a network, which may be found in https://github.com/Fantom-foundation/lachesis_launch

Launching opera readonly (non-validator) node for network specified by the genesis file:

$ opera --genesis file.g

Configuration

As an alternative to passing the numerous flags to the opera binary, you can also pass a configuration file via:

$ opera --config /path/to/your_config.toml

To get an idea how the file should look like you can use the dumpconfig subcommand to export your existing configuration:

$ opera --your-favourite-flags dumpconfig

Validator

New validator private key may be created with opera validator new command.

To launch a validator, you have to use --validator.id and --validator.pubkey flags to enable events emitter.

$ opera --nousb --validator.id YOUR_ID --validator.pubkey 0xYOUR_PUBKEY

opera will prompt you for a password to decrypt your validator private key. Optionally, you can specify password with a file using --validator.password flag.

This branch is for a transaction tracing node. It's not recommended to use this branch for an Opera validator.

Available methods

trace_get
trace_transaction
trace_block
trace_filter

Building the source

Building opera requires a Go (version 1.15 or later) and a C compiler. Once the dependencies are installed, run:

make opera

The build output is build/opera executable.

Running go-opera node with tracing ability

It's recommended to launch new node from scratch with CLI option --tracenode as this flag has to be set to use stored transaction traces.

$ opera --genesis /path/to/genesis.g --tracenode

Tracing pre-genesis blocks

If you want to use tracing for pre-genesis blocks, you'll need to import evm history. You can find instructions here: importing evm history

Then enable JSON-RPC API with option trace (--http.api=eth,web3,net,txpool,ftm,sfc,trace")

After that, you have to connect your nodes. Either connect them statically or specify a bootnode:

$ opera --fakenet 1/5 --bootnodes "enode://verylonghex@1.2.3.4:5050"

Running the demo

For the testing purposes, the full demo may be launched using:

cd demo/
./start.sh # start the Opera processes
./stop.sh # stop the demo
./clean.sh # erase the chain data

Check README.md in the demo directory for more information.