Experimental Opera

This version of Opera is a testing/benchmarking platform, it is not safe to use.

Building the source

Building miniopera requires both a Go (version 1.13 or later) and a C compiler. You can install them using your favourite package manager. Once the dependencies are installed, run

go build -o ./build/miniopera ./cmd/miniopera

The build output is build/miniopera executable.

Do not clone the project into $GOPATH, due to the Go Modules. Instead, use any other location.

Running miniopera

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 miniopera instance.

Configuration

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

$ miniopera --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:

$ miniopera --your-favourite-flags dumpconfig

Dev

Testing

Use the Go tool to run tests:

go test ./...

If everything goes well, it should output something along these lines:

?   	github.com/Fantom-foundation/miniopera/api	[no test files]
?   	github.com/Fantom-foundation/miniopera/miniopera	[no test files]
?   	github.com/Fantom-foundation/miniopera/miniopera/genesis	[no test files]
?   	github.com/Fantom-foundation/miniopera/cmd/miniopera	[no test files]
?   	github.com/Fantom-foundation/miniopera/cmd/miniopera/metrics	[no test files]
?   	github.com/Fantom-foundation/miniopera/debug	[no test files]
?   	github.com/Fantom-foundation/miniopera/eventcheck	[no test files]
?   	github.com/Fantom-foundation/miniopera/eventcheck/basiccheck	[no test files]
?   	github.com/Fantom-foundation/miniopera/eventcheck/heavycheck	[no test files]
?   	github.com/Fantom-foundation/miniopera/eventcheck/parentscheck	[no test files]
?   	github.com/Fantom-foundation/miniopera/gossip	[no test files]
?   	github.com/Fantom-foundation/miniopera/gossip/emitter	[no test files]
ok  	github.com/Fantom-foundation/miniopera/integration	10.078s
ok  	github.com/Fantom-foundation/miniopera/inter	(cached)
?   	github.com/Fantom-foundation/miniopera/logger	[no test files]
?   	github.com/Fantom-foundation/miniopera/metrics/prometheus	[no test files]
ok  	github.com/Fantom-foundation/miniopera/utils	(cached)
?   	github.com/Fantom-foundation/miniopera/utils/errlock	[no test files]
ok  	github.com/Fantom-foundation/miniopera/utils/fast	(cached)
ok  	github.com/Fantom-foundation/miniopera/utils/migration	(cached)
?   	github.com/Fantom-foundation/miniopera/utils/throughput	[no test files]
?   	github.com/Fantom-foundation/miniopera/version	[no test files]

Operating a private network (fakenet)

Fakenet is a private network optimized for your private testing. It'll generate a genesis containing N validators with equal stakes. To launch a validator in this network, all you need to do is specify a validator ID you're willing to launch.

Pay attention that validator's private keys are deterministically generated in this network, so you must use it only for private testing.

Maintaining your own private network is more involved as a lot of configurations taken for granted in the official networks need to be manually set up.

To run the fakenet with just one validator (which will work practically as a PoA blockchain), use:

$ miniopera --fakenet 1/1

To run the fakenet with 5 validators, run the command for each validator:

$ miniopera --fakenet 1/5 # first node, use 2/5 for second node

If you have to launch a non-validator node in fakenet, use 0 as ID:

$ miniopera --fakenet 0/5

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

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

Testing event payload

$ miniopera --bps=600000 --txpayload=100000

This combination of flags means "emit no more than 600000 bytes per second, place 100000 bytes of payload into each event"

Running the demo

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

cd demo/
./start.sh # start the fakenet instances
./stop.sh # stop the demo