In addition to deploying and testing on the Fuel Testnet, you can also run a local Fuel Node.
There are two types of Fuel networks that can be run:
An in-memory node does not persist the blockchain state anywhere, it is only stored in memory as long as the node is active and running.
To spin Up a local in-memory Fuel node, run the following command:
fuel-core run --db-type in-memoryTo deploy a contract to the local node, run the following command:
forc deploy <signing-key> --url 127.0.0.1:4000/graphqlOr to deploy without using a signing key:
forc deploy --unsigned --url 127.0.0.1:4000/graphqlThis node does persist the blockchain state locally.
To run a local node with persistance, you must configure a chainConfig.json file. Here is an example of what that looks like:
{
"chain_name": "local_testnet",
"block_production": {
"ProofOfAuthority": {
"trigger": "instant"
}
},
"parent_network": {
"type": "LocalTest"
},
"block_gas_limit": 1000000000,
"initial_state": {
"coins": [
{
"owner": "0x94ffcc53b892684acefaebc8a3d4a595e528a8cf664eeb3ef36f1020b0809d0d",
"amount": "0xFFFFFFFFFFFFFFFF",
"asset_id": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
{
"owner": "0x80d5e88c2b23ec2be6b2e76f3499a1a2755bb2773363785111a719513fb57b8e",
"amount": "0x00000000FFFFFFFF",
"asset_id": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
{
"owner": "0xf13c949256d0e119fecaec414ea452f21f9dc1870fb6262ff53b37c32cab4749",
"amount": "0x00000000FFFFFFFF",
"asset_id": "0x0000000000000000000000000000000000000000000000000000000000000000"
}
]
},
"transaction_parameters": {
"contract_max_size": 16777216,
"max_inputs": 255,
"max_outputs": 255,
"max_witnesses": 255,
"max_gas_per_tx": 100000000,
"max_script_length": 1048576,
"max_script_data_length": 1048576,
"max_static_contracts": 255,
"max_storage_slots": 255,
"max_predicate_length": 1048576,
"max_predicate_data_length": 1048576,
"gas_price_factor": 1000000000,
"gas_per_byte": 4,
"max_message_data_length": 1048576
},
"block_producer": {
"utxo_validation": true,
"coinbase_recipient": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"consensus": {
"PoA": {
"signing_key": "0x22ec92c3105c942a6640bdc4e4907286ec4728e8cfc0d8ac59aad4d8e1ccaefb"
}
}
}To start the node, run the following command:
fuel-core run --ip 127.0.0.1 --port 4000 --chain ./chainConfig.json --db-path ./.fueldbTo connect to the local node using a browser wallet, import the network address as:
http://127.0.0.1:4000/graphql