Allow adding a prefix to the informant

client/cli/src/commands/mod.rs

@@ -32,6 +32,7 @@ pub use self::purge_chain_cmd::PurgeChainCmd;
 pub use self::revert_cmd::RevertCmd;
 pub use self::run_cmd::RunCmd;
 pub use self::export_state_cmd::ExportStateCmd;
+use crate::SubstrateCli;
 use std::fmt::Debug;
 use structopt::StructOpt;
 
@@ -402,6 +403,12 @@ macro_rules! substrate_cli_subcommands {
 					$($enum::$variant(cmd) => cmd.log_filters()),*
 				}
 			}
+
+			fn informant_prefix<C: SubstrateCli>(&self) -> $crate::Result<String> {
+				match self {
+					$($enum::$variant(cmd) => cmd.informant_prefix::<C>()),*
+				}
+			}
 		}
 	}
 }

client/cli/src/config.rs

@@ -393,6 +393,11 @@ pub trait CliConfiguration: Sized {
 		Ok(true)
 	}
 
+	/// A prefix for the informant's logs
+	fn informant_prefix<C: SubstrateCli>(&self) -> Result<String> {
+		Ok(C::informant_prefix().to_string())
+	}
+
 	/// Create a Configuration object from the current object
 	fn create_configuration<C: SubstrateCli>(
 		&self,
@@ -464,6 +469,7 @@ pub trait CliConfiguration: Sized {
 			max_runtime_instances,
 			announce_block: self.announce_block()?,
 			role,
+			informant_prefix: self.informant_prefix::<C>()?,
 		})
 	}
 

client/cli/src/lib.rs

@@ -84,6 +84,11 @@ pub trait SubstrateCli: Sized {
 	/// Chain spec factory
 	fn load_spec(&self, id: &str) -> std::result::Result<Box<dyn ChainSpec>, String>;
 
+	/// A prefix for the informant's logs
+	fn informant_prefix() -> &'static str {
+		""
+	}
+
 	/// Helper function used to parse the command line arguments. This is the equivalent of
 	/// `structopt`'s `from_iter()` except that it takes a `VersionInfo` argument to provide the name of
 	/// the application, author, "about" and version. It will also set `AppSettings::GlobalVersion`.

client/cli/src/runner.rs

@@ -209,9 +209,12 @@ impl<C: SubstrateCli> Runner<C> {
 		F: FnOnce(Configuration) -> std::result::Result<T, sc_service::error::Error>,
 		T: AbstractService + Unpin,
 	{
+		let prefix = self.config.informant_prefix.clone();
 		let service = service_builder(self.config)?;
 
-		let informant_future = sc_informant::build(&service, sc_informant::OutputFormat::Coloured);
+		let informant_future = sc_informant::build(&service, sc_informant::OutputFormat::Coloured {
+			prefix,
+		});
 		let _informant_handle = self.tokio_runtime.spawn(informant_future);
 
 		// we eagerly drop the service so that the internal exit future is fired,

client/informant/src/display.rs

@@ -67,16 +67,18 @@ impl<B: BlockT> InformantDisplay<B> {
 		self.last_update = Instant::now();
 		self.last_number = Some(best_number);
 
-		let (status, target) = match (net_status.sync_state, net_status.best_seen_block) {
-			(SyncState::Idle, _) => ("💤 Idle".into(), "".into()),
-			(SyncState::Downloading, None) => (format!("⚙️  Preparing{}", speed), "".into()),
-			(SyncState::Downloading, Some(n)) => (format!("⚙️  Syncing{}", speed), format!(", target=#{}", n)),
+		let (level, status, target) = match (net_status.sync_state, net_status.best_seen_block) {
+			(SyncState::Idle, _) => ("💤", "Idle".into(), "".into()),
+			(SyncState::Downloading, None) => ("⚙️ ", format!("Preparing{}", speed), "".into()),
+			(SyncState::Downloading, Some(n)) => ("⚙️ ", format!("Syncing{}", speed), format!(", target=#{}", n)),
 		};
 
-		if self.format == OutputFormat::Coloured {
-			info!(
+		match &self.format {
+			OutputFormat::Coloured { prefix } => info!(
 				target: "substrate",
-				"{}{} ({} peers), best: #{} ({}), finalized #{} ({}), {} {}",
+				"{} {}{}{} ({} peers), best: #{} ({}), finalized #{} ({}), {} {}",
+				level,
+				prefix,
 				Colour::White.bold().paint(&status),
 				target,
 				Colour::White.bold().paint(format!("{}", num_connected_peers)),
@@ -86,11 +88,12 @@ impl<B: BlockT> InformantDisplay<B> {
 				info.chain.finalized_hash,
 				Colour::Green.paint(format!("⬇ {}", TransferRateFormat(net_status.average_download_per_sec))),
 				Colour::Red.paint(format!("⬆ {}", TransferRateFormat(net_status.average_upload_per_sec))),
-			);
-		} else {
-			info!(
+			),
+			OutputFormat::Plain { prefix } => info!(
 				target: "substrate",
-				"{}{} ({} peers), best: #{} ({}), finalized #{} ({}), ⬇ {} ⬆ {}",
+				"{} {}{}{} ({} peers), best: #{} ({}), finalized #{} ({}), ⬇ {} ⬆ {}",
+				level,
+				prefix,
 				status,
 				target,
 				num_connected_peers,
@@ -100,7 +103,7 @@ impl<B: BlockT> InformantDisplay<B> {
 				info.chain.finalized_hash,
 				TransferRateFormat(net_status.average_download_per_sec),
 				TransferRateFormat(net_status.average_upload_per_sec),
-			);
+			),
 		}
 	}
 }

client/informant/src/lib.rs

@@ -29,18 +29,22 @@ use std::time::Duration;
 mod display;
 
 /// The format to print telemetry output in.
-#[derive(PartialEq)]
+#[derive(Clone)]
 pub enum OutputFormat {
-	Coloured,
-	Plain,
+	Coloured {
+		prefix: String,
+	},
+	Plain {
+		prefix: String,
+	},
 }
 
 /// Creates an informant in the form of a `Future` that must be polled regularly.
 pub fn build(service: &impl AbstractService, format: OutputFormat) -> impl futures::Future<Output = ()> {
 	let client = service.client();
 	let pool = service.transaction_pool();
 
-	let mut display = display::InformantDisplay::new(format);
+	let mut display = display::InformantDisplay::new(format.clone());
 
 	let display_notifications = service
 		.network_status(Duration::from_millis(5000))
@@ -97,7 +101,18 @@ pub fn build(service: &impl AbstractService, format: OutputFormat) -> impl futur
 			last_best = Some((n.header.number().clone(), n.hash.clone()));
 		}
 
-		info!(target: "substrate", "✨ Imported #{} ({})", Colour::White.bold().paint(format!("{}", n.header.number())), n.hash);
+		match &format {
+			OutputFormat::Coloured { prefix } => info!(
+				target: "substrate",
+				"✨ {}Imported #{} ({})",
+				prefix, Colour::White.bold().paint(n.header.number().to_string()), n.hash,
+			),
+			OutputFormat::Plain { prefix } => info!(
+				target: "substrate", "✨ {}Imported #{} ({})",
+				prefix, n.header.number(), n.hash,
+			),
+		}
+
 		future::ready(())
 	});
 

client/service/src/config.rs

@@ -102,6 +102,8 @@ pub struct Configuration {
 	pub max_runtime_instances: usize,
 	/// Announce block automatically after they have been imported
 	pub announce_block: bool,
+	/// A prefix for the informant's logs
+	pub informant_prefix: String,
 }
 
 /// Type for tasks spawned by the executor.