feat: Add dumpgenesis subcommand

bin/reth/src/cli/mod.rs

@@ -7,7 +7,8 @@ use crate::{
     },
     cli::ext::RethCliExt,
     commands::{
-        config_cmd, db, debug_cmd, import, init_cmd, node, p2p, recover, stage, test_vectors,
+        config_cmd, db, debug_cmd, dump_genesis, import, init_cmd, node, p2p, recover, stage,
+        test_vectors,
     },
     core::cli::runner::CliRunner,
     version::{LONG_VERSION, SHORT_VERSION},
@@ -81,6 +82,7 @@ impl<Ext: RethCliExt> Cli<Ext> {
             Commands::Node(command) => runner.run_command_until_exit(|ctx| command.execute(ctx)),
             Commands::Init(command) => runner.run_blocking_until_ctrl_c(command.execute()),
             Commands::Import(command) => runner.run_blocking_until_ctrl_c(command.execute()),
+            Commands::DumpGenesis(command) => runner.run_blocking_until_ctrl_c(command.execute()),
             Commands::Db(command) => runner.run_blocking_until_ctrl_c(command.execute()),
             Commands::Stage(command) => runner.run_blocking_until_ctrl_c(command.execute()),
             Commands::P2P(command) => runner.run_until_ctrl_c(command.execute()),
@@ -128,6 +130,8 @@ pub enum Commands<Ext: RethCliExt = ()> {
     /// This syncs RLP encoded blocks from a file.
     #[command(name = "import")]
     Import(import::ImportCommand),
+    /// Dumps genesis block JSON configuration to stdout.
+    DumpGenesis(dump_genesis::DumpGenesisCommand),
     /// Database debugging utilities
     #[command(name = "db")]
     Db(db::Command),

bin/reth/src/commands/dump_genesis.rs

@@ -0,0 +1,47 @@
+//! Command that dumps genesis block JSON configuration to stdout
+use crate::args::utils::{chain_help, genesis_value_parser, SUPPORTED_CHAINS};
+use clap::Parser;
+use reth_primitives::ChainSpec;
+use std::sync::Arc;
+
+/// Dumps genesis block JSON configuration to stdout
+#[derive(Debug, Parser)]
+pub struct DumpGenesisCommand {
+    /// The chain this node is running.
+    ///
+    /// Possible values are either a built-in chain or the path to a chain specification file.
+    #[arg(
+        long,
+        value_name = "CHAIN_OR_PATH",
+        long_help = chain_help(),
+        default_value = SUPPORTED_CHAINS[0],
+        value_parser = genesis_value_parser
+    )]
+    chain: Arc<ChainSpec>,
+}
+
+impl DumpGenesisCommand {
+    /// Execute the `dump-genesis` command
+    pub async fn execute(self) -> eyre::Result<()> {
+        println!("{}", serde_json::to_string_pretty(self.chain.genesis())?);
+        Ok(())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn parse_dump_genesis_command_chain_args() {
+        for chain in SUPPORTED_CHAINS {
+            let args: DumpGenesisCommand =
+                DumpGenesisCommand::parse_from(["reth", "--chain", chain]);
+            assert_eq!(
+                Ok(args.chain.chain),
+                chain.parse::<reth_primitives::Chain>(),
+                "failed to parse chain {chain}"
+            );
+        }
+    }
+}

bin/reth/src/commands/mod.rs

@@ -3,8 +3,10 @@
 pub mod config_cmd;
 pub mod db;
 pub mod debug_cmd;
+pub mod dump_genesis;
 pub mod import;
 pub mod init_cmd;
+
 pub mod node;
 pub mod p2p;
 pub mod recover;

book/SUMMARY.md

@@ -31,6 +31,7 @@
     - [`reth node`](./cli/reth/node.md)
     - [`reth init`](./cli/reth/init.md)
     - [`reth import`](./cli/reth/import.md)
+    - [`reth dump-genesis`](./cli/reth/dump-genesis.md)
     - [`reth db`](./cli/reth/db.md)
       - [`reth db stats`](./cli/reth/db/stats.md)
       - [`reth db list`](./cli/reth/db/list.md)

book/cli/SUMMARY.md

@@ -2,6 +2,7 @@
   - [`reth node`](./reth/node.md)
   - [`reth init`](./reth/init.md)
   - [`reth import`](./reth/import.md)
+  - [`reth dump-genesis`](./reth/dump-genesis.md)
   - [`reth db`](./reth/db.md)
     - [`reth db stats`](./reth/db/stats.md)
     - [`reth db list`](./reth/db/list.md)

book/cli/reth.md

@@ -4,12 +4,15 @@ Reth
 
 ```bash
 $ reth --help
+Reth
+
 Usage: reth [OPTIONS] <COMMAND>
 
 Commands:
   node          Start the node
   init          Initialize the database from a genesis file
   import        This syncs RLP encoded blocks from a file
+  dump-genesis  Dumps genesis block JSON configuration to stdout
   db            Database debugging utilities
   stage         Manipulate individual stages
   p2p           P2P Debugging utilities

book/cli/reth/dump-genesis.md

@@ -0,0 +1,111 @@
+# reth dump-genesis
+
+This dumps genesis block JSON configuration to stdout
+
+```bash
+$ reth dump-genesis
+Dumps genesis block JSON configuration to stdout
+
+Usage: reth dump-genesis [OPTIONS]
+
+Options:
+      --chain <CHAIN_OR_PATH>
+          The chain this node is running.
+          Possible values are either a built-in chain or the path to a chain specification file.
+
+          Built-in chains:
+              mainnet, sepolia, goerli, holesky, dev
+
+          [default: mainnet]
+
+      --instance <INSTANCE>
+          Add a new instance of a node.
+
+          Configures the ports of the node to avoid conflicts with the defaults. This is useful for running multiple nodes on the same machine.
+
+          Max number of instances is 200. It is chosen in a way so that it's not possible to have port numbers that conflict with each other.
+          
+          Changes to the following port numbers: - DISCOVERY_PORT: default + `instance` - 1 - AUTH_PORT: default + `instance` * 100 - 100 - HTTP_RPC_PORT: default - `instance` + 1 - WS_RPC_PORT: default + `instance` * 2 - 2
+          
+          [default: 1]
+
+  -h, --help
+          Print help (see a summary with '-h')
+
+Logging:
+      --log.stdout.format <FORMAT>
+          The format to use for logs written to stdout
+          
+          [default: terminal]
+
+          Possible values:
+          - json:     Represents JSON formatting for logs. This format outputs log records as JSON objects, making it suitable for structured logging
+          - log-fmt:  Represents logfmt (key=value) formatting for logs. This format is concise and human-readable, typically used in command-line applications
+          - terminal: Represents terminal-friendly formatting for logs
+
+      --log.stdout.filter <FILTER>
+          The filter to use for logs written to stdout
+          
+          [default: ]
+
+      --log.file.format <FORMAT>
+          The format to use for logs written to the log file
+          
+          [default: terminal]
+
+          Possible values:
+          - json:     Represents JSON formatting for logs. This format outputs log records as JSON objects, making it suitable for structured logging
+          - log-fmt:  Represents logfmt (key=value) formatting for logs. This format is concise and human-readable, typically used in command-line applications
+          - terminal: Represents terminal-friendly formatting for logs
+
+      --log.file.filter <FILTER>
+          The filter to use for logs written to the log file
+          
+          [default: debug]
+
+      --log.file.directory <PATH>
+          The path to put log files in
+          
+          [default:  <CACHE_DIR>/logs]
+
+      --log.file.max-size <SIZE>
+          The maximum size (in MB) of one log file
+          
+          [default: 200]
+
+      --log.file.max-files <COUNT>
+          The maximum amount of log files that will be stored. If set to 0, background file logging is disabled
+          
+          [default: 5]
+
+      --log.journald
+          Write logs to journald
+
+      --log.journald.filter <FILTER>
+          The filter to use for logs written to journald
+          
+          [default: error]
+
+      --color <COLOR>
+          Sets whether or not the formatter emits ANSI terminal escape codes for colors and other text formatting
+          
+          [default: always]
+
+          Possible values:
+          - always: Colors on
+          - auto:   Colors on
+          - never:  Colors off
+
+Display:
+  -v, --verbosity...
+          Set the minimum log level.
+          
+          -v      Errors
+          -vv     Warnings
+          -vvv    Info
+          -vvvv   Debug
+          -vvvvv  Traces (warning: very verbose!)
+
+  -q, --quiet
+          Silence all log output
+```