chore(interop): Use pico-args instead of clap (#1242)

interop/Cargo.toml

@@ -16,8 +16,8 @@ path = "src/bin/server.rs"
 
 [dependencies]
 async-stream = "0.3"
-clap = {version = ">=4.0.26, <4.1", features = ["derive"]}
-clap_lex = "=0.3.0"             # keeps msrv to 1.60
+strum = {version = "0.24", features = ["derive"]}
+pico-args = {version = "0.5", features = ["eq-separator"]}
 console = "0.15"
 futures-core = "0.3"
 futures-util = "0.3"

interop/src/bin/client.rs

@@ -1,29 +1,31 @@
-use clap::{ArgAction, Parser};
 use interop::client;
-use std::time::Duration;
+use std::{str::FromStr, time::Duration};
 use tonic::transport::Endpoint;
 use tonic::transport::{Certificate, ClientTlsConfig};
 
-#[derive(Parser)]
+#[derive(Debug)]
 struct Opts {
-    #[clap(name = "use_tls", long, action = ArgAction::SetTrue)]
     use_tls: bool,
-
-    #[arg(
-        long = "test_case",
-        use_value_delimiter = true,
-        num_args(1..),
-        value_enum,
-        action = ArgAction::Append
-    )]
     test_case: Vec<Testcase>,
 }
 
+impl Opts {
+    fn parse() -> Result<Self, pico_args::Error> {
+        let mut pargs = pico_args::Arguments::from_env();
+        Ok(Self {
+            use_tls: pargs.contains("--use_tls"),
+            test_case: pargs.value_from_fn("--test_case", |test_case| {
+                test_case.split(',').map(Testcase::from_str).collect()
+            })?,
+        })
+    }
+}
+
 #[tokio::main]
 async fn main() -> Result<(), Box<dyn std::error::Error>> {
     interop::trace_init();
 
-    let matches = Opts::parse();
+    let matches = Opts::parse()?;
 
     let test_cases = matches.test_case;
 
@@ -99,8 +101,8 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
     Ok(())
 }
 
-#[derive(Debug, Copy, Clone, clap::ValueEnum)]
-#[clap(rename_all = "snake_case")]
+#[derive(Debug, strum::EnumString)]
+#[strum(serialize_all = "snake_case")]
 enum Testcase {
     EmptyUnary,
     CacheableUnary,

interop/src/bin/server.rs

@@ -1,19 +1,26 @@
-use clap::{ArgAction, Parser};
 use interop::server;
 use tonic::transport::Server;
 use tonic::transport::{Identity, ServerTlsConfig};
 
-#[derive(Parser)]
+#[derive(Debug)]
 struct Opts {
-    #[clap(name = "use_tls", long, action = ArgAction::SetTrue)]
     use_tls: bool,
 }
 
+impl Opts {
+    fn parse() -> Result<Self, pico_args::Error> {
+        let mut pargs = pico_args::Arguments::from_env();
+        Ok(Self {
+            use_tls: pargs.contains("--use_tls"),
+        })
+    }
+}
+
 #[tokio::main]
 async fn main() -> std::result::Result<(), Box<dyn std::error::Error>> {
     interop::trace_init();
 
-    let matches = Opts::parse();
+    let matches = Opts::parse()?;
 
     let addr = "127.0.0.1:10000".parse().unwrap();