feat: integrate serde and serde_json for JSON serialization in worksp…

…ace example

examples/r5/workspace-example/Cargo.toml

@@ -3,4 +3,8 @@
 members = [
     "utils",
     "foo"
-]
+]
+
+[workspace.dependencies]
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"

examples/r5/workspace-example/foo/Cargo.toml

@@ -5,3 +5,5 @@ edition = "2021"
 
 [dependencies]
 utils = { path = "../utils" }
+serde = { workspace = true, features = ["derive"] }
+serde_json = { workspace = true }

examples/r5/workspace-example/foo/src/main.rs

@@ -1,5 +1,5 @@
-use utils::add;
+use utils::bar::add;
 
 fn main() {
-    println!("{:?}", add(1, 2));
+    println!("{:?}", serde_json::to_string(&add(1, 2)).unwrap());
 }

examples/r5/workspace-example/utils/Cargo.toml

@@ -4,3 +4,5 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
+serde = { workspace = true, features = ["derive"] }
+serde_json = { workspace = true }

examples/r5/workspace-example/utils/src/bar.rs

@@ -0,0 +1,12 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct AddResponse {
+    pub output: u64,
+}
+
+pub fn add(left: u64, right: u64) -> AddResponse {
+    AddResponse {
+        output: left + right,
+    }
+}

examples/r5/workspace-example/utils/src/lib.rs

@@ -1,14 +1,13 @@
-pub fn add(left: u64, right: u64) -> u64 {
-    left + right
-}
+pub mod bar;
+pub use bar::*;
 
 #[cfg(test)]
 mod tests {
     use super::*;
 
     #[test]
     fn it_works() {
-        let result = add(2, 2);
-        assert_eq!(result, 4);
+        let result = bar::add(2, 2);
+        assert_eq!(result.output, 4);
     }
 }