Trait sc_cli::SubstrateCli

pub trait SubstrateCli: Sized {
    fn impl_name() -> String;
    fn impl_version() -> String;
    fn description() -> String;
    fn author() -> String;
    fn support_url() -> String;
    fn copyright_start_year() -> i32;
    fn load_spec(&self, id: &str) -> Result<Box<dyn ChainSpec>, String>;
    fn native_runtime_version(
        chain_spec: &Box<dyn ChainSpec>
    ) -> &'static RuntimeVersion;

    fn executable_name() -> String { ... }
    fn from_args() -> Self
    where
        Self: Parser + Sized,
    { ... }
    fn from_iter<I>(iter: I) -> Self
    where
        Self: Parser + Sized,
        I: IntoIterator,
        I::Item: Into<OsString> + Clone,
    { ... }
    fn try_from_iter<I>(iter: I) -> Result<Self>
    where
        Self: Parser + Sized,
        I: IntoIterator,
        I::Item: Into<OsString> + Clone,
    { ... }
    fn client_id() -> String { ... }
    fn create_configuration<T: CliConfiguration<DVC>, DVC: DefaultConfigurationValues>(
        &self,
        command: &T,
        tokio_handle: Handle
    ) -> Result<Configuration> { ... }
    fn create_runner<T: CliConfiguration<DVC>, DVC: DefaultConfigurationValues>(
        &self,
        command: &T
    ) -> Result<Runner<Self>> { ... }
    fn create_runner_with_logger_hook<T: CliConfiguration, F>(
        &self,
        command: &T,
        logger_hook: F
    ) -> Result<Runner<Self>>
    where
        F: FnOnce(&mut LoggerBuilder, &Configuration),
    { ... }
}

Substrate client CLI

This trait needs to be implemented on the root CLI struct of the application. It will provide the implementation name, version, executable name, description, author, support_url, copyright start year and most importantly: how to load the chain spec.

Required Methods

fn impl_name() -> String

Implementation name.

fn impl_version() -> String

Implementation version.

By default this will look like this:

2.0.0-b950f731c

Where the hash is the short commit hash of the commit of in the Git repository.

fn description() -> String

Executable file description.

fn author() -> String

Executable file author.

fn support_url() -> String

Support URL.

fn copyright_start_year() -> i32

Copyright starting year (x-current year)

fn load_spec(&self, id: &str) -> Result<Box<dyn ChainSpec>, String>

Chain spec factory

fn native_runtime_version(
    chain_spec: &Box<dyn ChainSpec>
) -> &'static RuntimeVersion

Native runtime version.

Provided Methods

fn executable_name() -> String

Executable file name.

Extracts the file name from std::env::current_exe(). Resorts to the env var CARGO_PKG_NAME in case of Error.

fn from_args() -> Selfwhere
    Self: Parser + Sized,

Helper function used to parse the command line arguments. This is the equivalent of clap::Parser::parse().

To allow running the node without subcommand, it also sets a few more settings: clap::Command::propagate_version, clap::Command::args_conflicts_with_subcommands, clap::Command::subcommand_negates_reqs.

Creates Self from the command line arguments. Print the error message and quit the program in case of failure.

fn from_iter<I>(iter: I) -> Selfwhere
    Self: Parser + Sized,
    I: IntoIterator,
    I::Item: Into<OsString> + Clone,

Helper function used to parse the command line arguments. This is the equivalent of clap::Parser::parse_from.

To allow running the node without subcommand, it also sets a few more settings: clap::Command::propagate_version, clap::Command::args_conflicts_with_subcommands, clap::Command::subcommand_negates_reqs.

Creates Self from any iterator over arguments. Print the error message and quit the program in case of failure.

fn try_from_iter<I>(iter: I) -> Result<Self>where
    Self: Parser + Sized,
    I: IntoIterator,
    I::Item: Into<OsString> + Clone,

Helper function used to parse the command line arguments. This is the equivalent of clap::Parser::try_parse_from

To allow running the node without subcommand, it also sets a few more settings: clap::Command::propagate_version, clap::Command::args_conflicts_with_subcommands, clap::Command::subcommand_negates_reqs.

Creates Self from any iterator over arguments. Print the error message and quit the program in case of failure.

NOTE: This method WILL NOT exit when --help or --version (or short versions) are used. It will return a clap::Error, where the clap::Error::kind is a clap::ErrorKind::DisplayHelp or clap::ErrorKind::DisplayVersion respectively. You must call clap::Error::exit or perform a std::process::exit.

fn client_id() -> String

Returns the client ID: {impl_name}/v{impl_version}

fn create_configuration<T: CliConfiguration<DVC>, DVC: DefaultConfigurationValues>(
    &self,
    command: &T,
    tokio_handle: Handle
) -> Result<Configuration>

Only create a Configuration for the command provided in argument

fn create_runner<T: CliConfiguration<DVC>, DVC: DefaultConfigurationValues>(
    &self,
    command: &T
) -> Result<Runner<Self>>

Create a runner for the command provided in argument. This will create a Configuration and a tokio runtime

fn create_runner_with_logger_hook<T: CliConfiguration, F>(
    &self,
    command: &T,
    logger_hook: F
) -> Result<Runner<Self>>where
    F: FnOnce(&mut LoggerBuilder, &Configuration),

Create a runner for the command provided in argument. The logger_hook can be used to setup a custom profiler or update the logger configuration before it is initialized.

Example:

use sc_tracing::{SpanDatum, TraceEvent};
struct TestProfiler;

impl sc_tracing::TraceHandler for TestProfiler {
 	fn handle_span(&self, sd: &SpanDatum) {}
		fn handle_event(&self, _event: &TraceEvent) {}
};

fn logger_hook() -> impl FnOnce(&mut sc_cli::LoggerBuilder, &sc_service::Configuration) -> () {
	|logger_builder, config| {
			logger_builder.with_custom_profiling(Box::new(TestProfiler{}));
	}
}

Implementors