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 download or copy the local snapshot from here , then run the following command:
fuel-core run --db-type in-memory --debug --snapshot ./your/path/to/chain_config_folderTo deploy a contract to the local node, run the following command:
forc deploy <signing-key> --node-url 127.0.0.1:4000/graphqlOr to deploy with the default signer that is pre-funded by fuel-core:
forc deploy --default-signer --node-url 127.0.0.1:4000/graphql To modify the initial state of the chain, you must configure the state_config.json file in your chain configuration folder.
Here is an example of what that looks like using version 0.26.0 of fuel-core:
Here is the specific configuration
chain_config.json
{
"chain_name": "Upgradable Testnet",
"consensus_parameters": {
"V1": {
"tx_params": {
"V1": {
"max_inputs": 255,
"max_outputs": 255,
"max_witnesses": 255,
"max_gas_per_tx": 30000000,
"max_size": 112640,
"max_bytecode_subsections": 256
}
},
"predicate_params": {
"V1": {
"max_predicate_length": 102400,
"max_predicate_data_length": 102400,
"max_message_data_length": 102400,
"max_gas_per_predicate": 30000000
}
},
"script_params": {
"V1": {
"max_script_length": 102400,
"max_script_data_length": 102400
}
},
"contract_params": {
"V1": {
"contract_max_size": 102400,
"max_storage_slots": 1760
}
},
"fee_params": {
"V1": {
"gas_price_factor": 92,
"gas_per_byte": 63
}
},
"chain_id": 0,
"gas_costs": {
"V1": {
"add": 2,
"addi": 2,
"aloc": 1,
"and": 2,
"andi": 2,
"bal": 366,
"bhei": 2,
"bhsh": 2,
"burn": 33949,
"cb": 2,
"cfei": 2,
"cfsi": 2,
"div": 2,
"divi": 2,
"eck1": 3347,
"ecr1": 46165,
"ed19": 4210,
"eq": 2,
"exp": 2,
"expi": 2,
"flag": 1,
"gm": 2,
"gt": 2,
"gtf": 16,
"ji": 2,
"jmp": 2,
"jne": 2,
"jnei": 2,
"jnzi": 2,
"jmpf": 2,
"jmpb": 2,
"jnzf": 2,
"jnzb": 2,
"jnef": 2,
"jneb": 2,
"lb": 2,
"log": 754,
"lt": 2,
"lw": 2,
"mint": 35718,
"mlog": 2,
"mod": 2,
"modi": 2,
"move": 2,
"movi": 2,
"mroo": 5,
"mul": 2,
"muli": 2,
"mldv": 4,
"noop": 1,
"not": 2,
"or": 2,
"ori": 2,
"poph": 3,
"popl": 3,
"pshh": 4,
"pshl": 4,
"ret_contract": 733,
"rvrt_contract": 722,
"sb": 2,
"sll": 2,
"slli": 2,
"srl": 2,
"srli": 2,
"srw": 253,
"sub": 2,
"subi": 2,
"sw": 2,
"sww": 29053,
"time": 79,
"tr": 46242,
"tro": 33251,
"wdcm": 3,
"wqcm": 3,
"wdop": 3,
"wqop": 3,
"wdml": 3,
"wqml": 4,
"wddv": 5,
"wqdv": 7,
"wdmd": 11,
"wqmd": 18,
"wdam": 9,
"wqam": 12,
"wdmm": 11,
"wqmm": 11,
"xor": 2,
"xori": 2,
"call": {
"LightOperation": {
"base": 21687,
"units_per_gas": 4
}
},
"ccp": {
"LightOperation": {
"base": 59,
"units_per_gas": 20
}
},
"croo": {
"LightOperation": {
"base": 1,
"units_per_gas": 1
}
},
"csiz": {
"LightOperation": {
"base": 59,
"units_per_gas": 195
}
},
"k256": {
"LightOperation": {
"base": 282,
"units_per_gas": 3
}
},
"ldc": {
"LightOperation": {
"base": 45,
"units_per_gas": 65
}
},
"logd": {
"LightOperation": {
"base": 1134,
"units_per_gas": 2
}
},
"mcl": {
"LightOperation": {
"base": 3,
"units_per_gas": 523
}
},
"mcli": {
"LightOperation": {
"base": 3,
"units_per_gas": 526
}
},
"mcp": {
"LightOperation": {
"base": 3,
"units_per_gas": 448
}
},
"mcpi": {
"LightOperation": {
"base": 7,
"units_per_gas": 585
}
},
"meq": {
"LightOperation": {
"base": 11,
"units_per_gas": 1097
}
},
"retd_contract": {
"LightOperation": {
"base": 1086,
"units_per_gas": 2
}
},
"s256": {
"LightOperation": {
"base": 45,
"units_per_gas": 3
}
},
"scwq": {
"HeavyOperation": {
"base": 30375,
"gas_per_unit": 28628
}
},
"smo": {
"LightOperation": {
"base": 64196,
"units_per_gas": 1
}
},
"srwq": {
"HeavyOperation": {
"base": 262,
"gas_per_unit": 249
}
},
"swwq": {
"HeavyOperation": {
"base": 28484,
"gas_per_unit": 26613
}
},
"contract_root": {
"LightOperation": {
"base": 45,
"units_per_gas": 1
}
},
"state_root": {
"HeavyOperation": {
"base": 350,
"gas_per_unit": 176
}
},
"new_storage_per_byte": 63,
"vm_initialization": {
"LightOperation": {
"base": 1645,
"units_per_gas": 14
}
}
}
},
"base_asset_id": "0000000000000000000000000000000000000000000000000000000000000000",
"block_gas_limit": 30000000,
"privileged_address": "0000000000000000000000000000000000000000000000000000000000000000"
}
},
"consensus": {
"PoA": {
"signing_key": "f65d6448a273b531ee942c133bb91a6f904c7d7f3104cdaf6b9f7f50d3518871"
}
}
} metadata.json
{
"chain_config": "chain_config.json",
"table_encoding": {
"Json": {
"filepath": "state_config.json"
}
}
} state_config.json
{
"coins": [],
"messages": [],
"contracts": [
{
"contract_id": "7777777777777777777777777777777777777777777777777777777777777777",
"code": "9000000994318e6e453f30e85bf6088f7161d44e57b86a6af0c955d22b353f91b2465f5e6140000a504d00205d4d30001a4860004945048076440001240400005050c0043d51345024040000",
"tx_id": "0000000000000000000000000000000000000000000000000000000000000000",
"output_index": 0,
"tx_pointer_block_height": 0,
"tx_pointer_tx_idx": 0,
"states": [],
"balances": []
}
],
"last_block": null
} state_transition_bytecode.wasm
Which is too large to display on this page, but you can find it here
To start the node with a custom configuration, you can use the command below:
fuel-core run --snapshot ./your/path/to/chain_config_folder --db-type in-memory --debug To find an example chain configuration folder for a specific fuel-core version, refer to the fuel-core repo.
You can edit the coins array inside state_config.json to modify the initial assets owned by a given address.
The owner address must be a B256 type address (begins with 0x) instead of a Bech32 type (begins with fuel).
The amount is a numerical value. In this example, the value translates to 11,152,921,504 ETH.
This node does persist the blockchain state locally. To run a local node with persistence a chain configuration file is required.
To start the node, run the following command:
fuel-core run --ip 127.0.0.1 --port 4000 --snapshot ./your/path/to/chain_config_folder --db-path ./.fueldb --debugTo connect to the local node using a browser wallet, import the network address as:
http://127.0.0.1:4000/graphql