Draft: spam-stream subcommand for streaming tx specs (relayer use case)

crates/cli/src/commands/contender_subcommand.rs

@@ -9,6 +9,7 @@ use crate::default_scenarios::BuiltinScenarioCli;
 
 use super::admin::AdminCommand;
 use super::spam::SpamCliArgs;
+use super::spam_stream::SpamStreamCliArgs;
 use super::ReportFormat;
 
 #[derive(Debug, Subcommand)]
@@ -34,6 +35,16 @@ pub enum ContenderSubcommand {
         builtin_scenario_config: Option<BuiltinScenarioCli>,
     },
 
+    #[command(
+        name = "spam-stream",
+        long_about = "Read newline-delimited JSON tx specs from stdin or a file and spam them. \
+                      Each line is a FunctionCallDefinition (same fields as scenario TOML `[[spam.tx]]`)."
+    )]
+    SpamStream {
+        #[command(flatten)]
+        args: Box<SpamStreamCliArgs>,
+    },
+
     #[command(
         name = "setup",
         long_about = "Deploy contracts and execute one-time setup txs."

crates/cli/src/commands/error.rs

@@ -78,6 +78,9 @@ pub enum ArgsError {
 
     #[error("failed to parse url")]
     UrlParse(#[from] url::ParseError),
+
+    #[error("{0}")]
+    Custom(String),
 }
 
 #[derive(Debug, Error)]

crates/cli/src/commands/mod.rs

@@ -8,6 +8,7 @@ pub mod replay;
 pub mod rpc;
 mod setup;
 mod spam;
+pub mod spam_stream;
 
 use clap::{Parser, ValueEnum};
 use contender_core::db::DbOps;