feat: add a --dev option

bin/reth/src/args/dev_args.rs

@@ -0,0 +1,96 @@
+//! clap [Args](clap::Args) for Dev testnet configuration
+use std::time::Duration;
+
+use clap::Args;
+use humantime::parse_duration;
+
+/// Parameters for Dev testnet configuration
+#[derive(Debug, Args, PartialEq, Default, Clone, Copy)]
+#[command(next_help_heading = "Dev testnet")]
+pub struct DevArgs {
+    /// Start the node in dev mode
+    ///
+    /// This mode uses a local proof-of-authority consensus engine with either fixed block times
+    /// or automatically mined blocks.
+    /// Disables network discovery and enables local http server.
+    /// Prefunds 20 accounts derived by mnemonic "test test test test test test test test test test
+    /// test junk" with 10 000 ETH each.
+    #[arg(long = "dev", help_heading = "Dev testnet", verbatim_doc_comment)]
+    pub dev: bool,
+
+    /// How many transactions to mine per block.
+    #[arg(
+        long = "dev.block_max_transactions",
+        help_heading = "Dev testnet",
+        conflicts_with = "block_time"
+    )]
+    pub block_max_transactions: Option<usize>,
+
+    /// Interval between blocks.
+    ///
+    /// Parses strings using [humantime::parse_duration]
+    /// --dev.block_time 12s
+    #[arg(
+        long = "dev.block_time",
+        help_heading = "Dev testnet", 
+        conflicts_with = "block_max_transactions",
+        value_parser = parse_duration,
+        verbatim_doc_comment
+    )]
+    pub block_time: Option<Duration>,
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use clap::Parser;
+
+    /// A helper type to parse Args more easily
+    #[derive(Parser)]
+    struct CommandParser<T: Args> {
+        #[clap(flatten)]
+        args: T,
+    }
+
+    #[test]
+    fn test_parse_dev_args() {
+        let args = CommandParser::<DevArgs>::parse_from(["reth"]).args;
+        assert_eq!(args, DevArgs { dev: false, block_max_transactions: None, block_time: None });
+
+        let args = CommandParser::<DevArgs>::parse_from(["reth", "--dev"]).args;
+        assert_eq!(args, DevArgs { dev: true, block_max_transactions: None, block_time: None });
+
+        let args = CommandParser::<DevArgs>::parse_from([
+            "reth",
+            "--dev",
+            "--dev.block_max_transactions",
+            "2",
+        ])
+        .args;
+        assert_eq!(args, DevArgs { dev: true, block_max_transactions: Some(2), block_time: None });
+
+        let args =
+            CommandParser::<DevArgs>::parse_from(["reth", "--dev", "--dev.block_time", "1s"]).args;
+        assert_eq!(
+            args,
+            DevArgs {
+                dev: true,
+                block_max_transactions: None,
+                block_time: Some(std::time::Duration::from_secs(1))
+            }
+        );
+    }
+
+    #[test]
+    fn test_parse_dev_args_conflicts() {
+        let args = CommandParser::<DevArgs>::try_parse_from([
+            "reth",
+            "--dev",
+            "--dev.block_max_transactions",
+            "2",
+            "--dev.block_time",
+            "1s",
+        ]);
+        assert!(args.is_err());
+    }
+}

bin/reth/src/args/mod.rs

@@ -35,4 +35,8 @@ pub use gas_price_oracle_args::GasPriceOracleArgs;
 mod txpool_args;
 pub use txpool_args::TxPoolArgs;
 
+/// DevArgs for configuring the dev testnet
+mod dev_args;
+pub use dev_args::DevArgs;
+
 pub mod utils;

bin/reth/src/args/network_args.rs

@@ -110,7 +110,7 @@ impl NetworkArgs {
 #[derive(Debug, Args)]
 pub struct DiscoveryArgs {
     /// Disable the discovery service.
-    #[arg(short, long)]
+    #[arg(short, long, default_value_if("dev", "true", "true"))]
     pub disable_discovery: bool,
 
     /// Disable the DNS discovery.

bin/reth/src/args/rpc_server_args.rs

@@ -56,7 +56,7 @@ pub(crate) const RPC_DEFAULT_MAX_TRACING_REQUESTS: u32 = 25;
 #[command(next_help_heading = "RPC")]
 pub struct RpcServerArgs {
     /// Enable the HTTP-RPC server
-    #[arg(long)]
+    #[arg(long, default_value_if("dev", "true", "true"))]
     pub http: bool,
 
     /// Http server address to listen on

bin/reth/src/args/utils.rs

@@ -1,7 +1,7 @@
 //! Clap parser utilities
 
 use reth_primitives::{
-    fs, AllGenesisFormats, BlockHashOrNumber, ChainSpec, GOERLI, MAINNET, SEPOLIA,
+    fs, AllGenesisFormats, BlockHashOrNumber, ChainSpec, DEV, GOERLI, MAINNET, SEPOLIA,
 };
 use reth_revm::primitives::B256 as H256;
 use std::{
@@ -25,6 +25,7 @@ pub fn chain_spec_value_parser(s: &str) -> eyre::Result<Arc<ChainSpec>, eyre::Er
         "mainnet" => MAINNET.clone(),
         "goerli" => GOERLI.clone(),
         "sepolia" => SEPOLIA.clone(),
+        "dev" => DEV.clone(),
         _ => {
             let raw = fs::read_to_string(PathBuf::from(shellexpand::full(s)?.into_owned()))?;
             serde_json::from_str(&raw)?
@@ -39,6 +40,7 @@ pub fn genesis_value_parser(s: &str) -> eyre::Result<Arc<ChainSpec>, eyre::Error
         "mainnet" => MAINNET.clone(),
         "goerli" => GOERLI.clone(),
         "sepolia" => SEPOLIA.clone(),
+        "dev" => DEV.clone(),
         _ => {
             let raw = fs::read_to_string(PathBuf::from(shellexpand::full(s)?.into_owned()))?;
             let genesis: AllGenesisFormats = serde_json::from_str(&raw)?;

bin/reth/src/node/mod.rs

@@ -2,7 +2,7 @@
 //!
 //! Starts the client
 use crate::{
-    args::{get_secret_key, DebugArgs, NetworkArgs, RpcServerArgs, TxPoolArgs},
+    args::{get_secret_key, DebugArgs, DevArgs, NetworkArgs, RpcServerArgs, TxPoolArgs},
     dirs::DataDirPath,
     init::init_genesis,
     prometheus_exporter,
@@ -111,12 +111,15 @@ pub struct Command {
     /// - mainnet
     /// - goerli
     /// - sepolia
+    /// - dev
     #[arg(
         long,
         value_name = "CHAIN_OR_PATH",
         verbatim_doc_comment,
         default_value = "mainnet",
-        value_parser = genesis_value_parser
+        default_value_if("dev", "true", "dev"),
+        value_parser = genesis_value_parser,
+        required = false,
     )]
     chain: Arc<ChainSpec>,
 
@@ -144,9 +147,8 @@ pub struct Command {
     #[clap(flatten)]
     db: DatabaseArgs,
 
-    /// Automatically mine blocks for new transactions
-    #[arg(long)]
-    auto_mine: bool,
+    #[clap(flatten)]
+    dev: DevArgs,
 }
 
 impl Command {
@@ -180,7 +182,7 @@ impl Command {
 
         info!(target: "reth::cli", "{}", DisplayHardforks::from(self.chain.hardforks().clone()));
 
-        let consensus: Arc<dyn Consensus> = if self.auto_mine {
+        let consensus: Arc<dyn Consensus> = if self.dev.dev {
             debug!(target: "reth::cli", "Using auto seal");
             Arc::new(AutoSealConsensus::new(Arc::clone(&self.chain)))
         } else {
@@ -303,13 +305,17 @@ impl Command {
         };
 
         // Configure the pipeline
-        let (mut pipeline, client) = if self.auto_mine {
+        let (mut pipeline, client) = if self.dev.dev {
+            info!(target: "reth::cli", "Starting Reth in dev mode");
+
             let (_, client, mut task) = AutoSealBuilder::new(
                 Arc::clone(&self.chain),
                 blockchain_db.clone(),
                 transaction_pool.clone(),
                 consensus_engine_tx.clone(),
                 canon_state_notification_sender,
+                self.dev.block_max_transactions,
+                self.dev.block_time,
             )
             .build();
 
@@ -790,6 +796,8 @@ async fn run_network_until_shutdown<C>(
 
 #[cfg(test)]
 mod tests {
+    use reth_primitives::DEV;
+
     use super::*;
     use std::{net::IpAddr, path::Path};
 
@@ -861,4 +869,22 @@ mod tests {
         let db_path = data_dir.db_path();
         assert_eq!(db_path, Path::new("my/custom/path/db"));
     }
+
+    #[test]
+    fn parse_dev() {
+        let cmd = Command::parse_from(["reth", "--dev"]);
+        let chain = DEV.clone();
+        assert_eq!(cmd.chain.chain, chain.chain);
+        assert_eq!(cmd.chain.genesis_hash, chain.genesis_hash);
+        assert_eq!(
+            cmd.chain.paris_block_and_final_difficulty,
+            chain.paris_block_and_final_difficulty
+        );
+        assert_eq!(cmd.chain.hardforks, chain.hardforks);
+
+        assert!(cmd.rpc.http);
+        assert!(cmd.network.discovery.disable_discovery);
+
+        assert!(cmd.dev.dev);
+    }
 }

crates/consensus/auto-seal/src/lib.rs

@@ -37,7 +37,7 @@ use reth_transaction_pool::TransactionPool;
 use std::{
     collections::HashMap,
     sync::Arc,
-    time::{SystemTime, UNIX_EPOCH},
+    time::{Duration, SystemTime, UNIX_EPOCH},
 };
 use tokio::sync::{mpsc::UnboundedSender, RwLock, RwLockReadGuard, RwLockWriteGuard};
 use tracing::{trace, warn};
@@ -115,13 +115,23 @@ where
         pool: Pool,
         to_engine: UnboundedSender<BeaconEngineMessage>,
         canon_state_notification: CanonStateNotificationSender,
+        block_max_transactions: Option<usize>,
+        block_time: Option<Duration>,
     ) -> Self {
         let latest_header = client
             .latest_header()
             .ok()
             .flatten()
             .unwrap_or_else(|| chain_spec.sealed_genesis_header());
-        let mode = MiningMode::interval(std::time::Duration::from_secs(1));
+
+        let mode = if let Some(interval) = block_time {
+            MiningMode::interval(interval)
+        } else if let Some(max_transactions) = block_max_transactions {
+            MiningMode::instant(max_transactions, pool.pending_transactions_listener())
+        } else {
+            warn!("No mining mode specified, defaulting to ReadyTransaction");
+            MiningMode::instant(1, pool.pending_transactions_listener())
+        };
 
         Self {
             storage: Storage::new(latest_header),
@@ -292,7 +302,7 @@ impl StorageInner {
         trace!(target: "consensus::auto", transactions=?&block.body, "executing transactions");
 
         let (post_state, gas_used) =
-            executor.execute_transactions(block, U256::ZERO, Some(senders.clone()))?;
+            executor.execute_transactions(block, U256::ZERO, Some(senders))?;
 
         // apply post block changes
         let post_state = executor.apply_post_block_changes(block, U256::ZERO, post_state)?;

crates/primitives/res/genesis/dev.json

@@ -0,0 +1,75 @@
+{
+  "nonce": "0x0",
+  "timestamp": "0x6490fdd2",
+  "extraData": "0x",
+  "gasLimit": "0x1c9c380",
+  "difficulty": "0x0",
+  "mixHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
+  "coinbase": "0x0000000000000000000000000000000000000000",
+  "stateRoot": "0x5eb6e371a698b8d68f665192350ffcecbbbf322916f4b51bd79bb6887da3f494",
+  "alloc": {
+    "0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266": {
+      "balance": "0xD3C21BCECCEDA1000000"
+    },
+    "0x70997970C51812dc3A010C7d01b50e0d17dc79C8": {
+      "balance": "0xD3C21BCECCEDA1000000"
+    },
+    "0x3C44CdDdB6a900fa2b585dd299e03d12FA4293BC": {
+      "balance": "0xD3C21BCECCEDA1000000"
+    },
+    "0x90F79bf6EB2c4f870365E785982E1f101E93b906": {
+      "balance": "0xD3C21BCECCEDA1000000"
+    },
+    "0x15d34AAf54267DB7D7c367839AAf71A00a2C6A65": {
+      "balance": "0xD3C21BCECCEDA1000000"
+    },
+    "0x9965507D1a55bcC2695C58ba16FB37d819B0A4dc": {
+      "balance": "0xD3C21BCECCEDA1000000"
+    },
+    "0x976EA74026E726554dB657fA54763abd0C3a0aa9": {
+      "balance": "0xD3C21BCECCEDA1000000"
+    },
+    "0x14dC79964da2C08b23698B3D3cc7Ca32193d9955": {
+      "balance": "0xD3C21BCECCEDA1000000"
+    },
+    "0x23618e81E3f5cdF7f54C3d65f7FBc0aBf5B21E8f": {
+      "balance": "0xD3C21BCECCEDA1000000"
+    },
+    "0xa0Ee7A142d267C1f36714E4a8F75612F20a79720": {
+      "balance": "0xD3C21BCECCEDA1000000"
+    },
+    "0xBcd4042DE499D14e55001CcbB24a551F3b954096": {
+      "balance": "0xD3C21BCECCEDA1000000"
+    },
+    "0x71bE63f3384f5fb98995898A86B02Fb2426c5788": {
+      "balance": "0xD3C21BCECCEDA1000000"
+    },
+    "0xFABB0ac9d68B0B445fB7357272Ff202C5651694a": {
+      "balance": "0xD3C21BCECCEDA1000000"
+    },
+    "0x1CBd3b2770909D4e10f157cABC84C7264073C9Ec": {
+      "balance": "0xD3C21BCECCEDA1000000"
+    },
+    "0xdF3e18d64BC6A983f673Ab319CCaE4f1a57C7097": {
+      "balance": "0xD3C21BCECCEDA1000000"
+    },
+    "0xcd3B766CCDd6AE721141F452C550Ca635964ce71": {
+      "balance": "0xD3C21BCECCEDA1000000"
+    },
+    "0x2546BcD3c84621e976D8185a91A922aE77ECEc30": {
+      "balance": "0xD3C21BCECCEDA1000000"
+    },
+    "0xbDA5747bFD65F08deb54cb465eB87D40e51B197E": {
+      "balance": "0xD3C21BCECCEDA1000000"
+    },
+    "0xdD2FD4581271e230360230F9337D5c0430Bf44C0": {
+      "balance": "0xD3C21BCECCEDA1000000"
+    },
+    "0x8626f6940E2eb28930eFb4CeF49B2d1F2C9C1199": {
+      "balance": "0xD3C21BCECCEDA1000000"
+    }
+  },
+  "number": "0x0",
+  "gasUsed": "0x0",
+  "parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000"
+}

crates/primitives/src/chain/mod.rs

@@ -11,7 +11,7 @@ use std::{fmt, str::FromStr};
 mod spec;
 pub use spec::{
     AllGenesisFormats, ChainSpec, ChainSpecBuilder, DisplayHardforks, ForkCondition,
-    ForkTimestamps, GOERLI, MAINNET, SEPOLIA,
+    ForkTimestamps, DEV, GOERLI, MAINNET, SEPOLIA,
 };
 
 // The chain info module.
@@ -44,6 +44,11 @@ impl Chain {
         Chain::Named(ethers_core::types::Chain::Sepolia)
     }
 
+    /// Returns the dev chain.
+    pub const fn dev() -> Self {
+        Chain::Named(ethers_core::types::Chain::Dev)
+    }
+
     /// The id of the chain
     pub fn id(&self) -> u64 {
         match self {