A Flask wrapper of Starknet state. Similar in purpose to Ganache.
Aims to mimic Starknet's Alpha testnet, but with simplified functionality.
- Install
- Disclaimer
- Run
- Interaction
- Dumping and Loading
- Hardhat Integration
- L1-L2 Postman Communication
- Block Explorer
- Lite Mode
- Development
pip install starknet-devnet
Works with Python versions <=3.8.9.
On Ubuntu/Debian, first run:
sudo apt install -y libgmp3-dev
On Mac, you can use brew
:
brew install gmp
- Devnet should not be used as a replacement for Alpha testnet. After testing on Devnet, be sure to test on testnet!
- Specifying a block by its hash/number is not supported. All interaction is done with the latest block.
- Read more in interaction.
Installing the package adds the starknet-devnet
command.
usage: starknet-devnet [-h] [-v] [--host HOST] [--port PORT]
Run a local instance of Starknet Devnet
optional arguments:
-h, --help show this help message and exit
-v, --version Print the version
--host HOST Specify the address to listen at; defaults to localhost (use the address the program outputs on start)
--port PORT, -p PORT Specify the port to listen at; defaults to 5000
--load-path LOAD_PATH
Specify the path from which the state is loaded on
startup
--dump-path DUMP_PATH
Specify the path to dump to
--dump-on DUMP_ON Specify when to dump; can dump on: exit, transaction
Devnet is available as a Docker container (shardlabs/starknet-devnet):
docker pull shardlabs/starknet-devnet
The server inside the container listens to the port 5000, which you need to publish to a desired <PORT>
on your host machine:
docker run -p [HOST:]<PORT>:5000 shardlabs/starknet-devnet
E.g. if you want to use your host machine's 127.0.0.1:5000
, you need to run:
docker run -p 127.0.0.1:5000:5000 shardlabs/starknet-devnet
You may ignore any address-related output logged on container startup (e.g. Running on all addresses
or Running on http://172.17.0.2:5000
). What you will use is what you specified with the -p
argument.
If you don't specify the HOST
part, the server will indeed be available on all of your host machine's addresses (localhost, local network IP, etc.), which may present a security issue if you don't want anyone from the local network to access your Devnet instance.
- Interact with Devnet as you would with the official Starknet Alpha testnet.
- The exact underlying API is not exposed for the same reason Alpha testnet does not expose it.
- To use Devnet with Starknet CLI, provide Devnet's URL to the
--gateway_url
and--feeder_gateway_url
options of Starknet CLI commands. - The following Starknet CLI commands are supported:
call
deploy
estimate_fee
get_block
get_code
get_full_contract
get_state_update
get_storage_at
get_transaction
get_transaction_receipt
get_transaction_trace
invoke
(currently will fail for max_fee > 0)tx_status
- The following Starknet CLI commands are not supported:
get_contract_addresses
- If you're using the Hardhat plugin, see here on how to edit its config file to integrate Devnet.
Postman is a Starknet utility that allows testing L1 <> L2 interactions. To utilize this, you can use starknet-hardhat-plugin
, as witnessed in this example. Or you can directly interact with the two Postman-specific endpoints:
-
Load a
StarknetMockMessaging
contract. Theaddress
parameter is optional; if provided, theStarknetMockMessaging
contract will be fetched from that address, otherwise a new one will be deployed:POST /postman/load_l1_messaging_contract
- body:
{ "networkUrl": "http://localhost:5005", "address": "0x83D76591560d9CD02CE16c060c92118d19F996b3" }
networkUrl
- the URL of the L1 network you've run locally or that already exists; possibilities include, and are not limited to:
-
Flush. This will go through the new enqueued messages sent from L1 and send them to L2. This has to be done manually for L1 -> L2, but for L2 -> L1, it is done automatically:
POST /postman/flush
- body: None
This method of L1 <> L2 communication testing differs from Starknet Alpha networks. Taking the L1L2Example.sol contract in the starknet documentation:
constructor(IStarknetCore starknetCore_) public {
starknetCore = starknetCore_;
}
The constructor takes an IStarknetCore
contract as argument, however for Devnet L1 <> L2 communication testing, this will have to be replaced with the MockStarknetMessaging.sol contract:
constructor(MockStarknetMessaging mockStarknetMessaging_) public {
starknetCore = mockStarknetMessaging_;
}
To preserve your Devnet instance for future use, there are several options:
- Dumping on exit (handles Ctrl+C, i.e. SIGINT, doesn't handle SIGKILL):
starknet-devnet --dump-on exit --dump-path <PATH>
- Dumping after each transaction (done in background, doesn't block):
starknet-devnet --dump-on transaction --dump-path <PATH>
- Dumping on request (replace
<HOST>
,<PORT>
and<PATH>
with your own):
curl -X POST http://<HOST>:<PORT>/dump -d '{ "path": <PATH> }' -H "Content-Type: application/json"
To load a preserved Devnet instance, run:
starknet-devnet --load-path <PATH>
To enable dumping and loading if running Devnet in a Docker container, you must bind the container path with the path on your host machine.
This example:
- Relies on Docker bind mount; try Docker volume instead.
- Assumes that
/actual/dumpdir
exists. If unsure, use absolute paths. - Assumes you are listening on
127.0.0.1:5000
.
If there is dump.pkl
inside /actual/dumpdir
, you can load it with:
docker run \
-p 127.0.0.1:5000:5000 \
--mount type=bind,source=/actual/dumpdir,target=/dumpdir \
shardlabs/starknet-devnet \
--load-path /dumpdir/dump.pkl
To dump to /actual/dumpdir/dump.pkl
on Devnet shutdown, run:
docker run \
-p 127.0.0.1:5000:5000 \
--mount type=bind,source=/actual/dumpdir,target=/dumpdir \
shardlabs/starknet-devnet \
--dump-on exit --dump-path /dumpdir/dump.pkl
To see how to setup a local block explorer (Voyager) check here.
To improve Devnet performance, consider passing these CLI flags on Devnet startup:
--lite-mode
enables all of the optimizations described below (same as using all of the following flags);--lite-mode-deploy-hash
disables the calculation of the transaction hash for deploy transactions. It will instead be a simple sequence of numbers;--lite-mode-block-hash
disables the calculation of the block hash. It will instead be a simple sequence of numbers;
If you're a developer willing to contribute, be sure to have installed Poetry.
poetry run starknet-devnet
When running tests locally, do it from the project root:
poetry run pytest test/
or for a single file
poetry run pytest test/<TEST_FILE>
You don't need to build anything to be able to run locally, but if you need the *.whl
or *.tar.gz
artifacts, run
poetry build