3 files changed, 59 insertions, 0 deletions
diff --git a/crates/core/tedge_lib/Cargo.toml b/crates/core/tedge_lib/Cargo.toml
index 083779ea..5c95662a 100644
--- a/crates/core/tedge_lib/Cargo.toml
+++ b/crates/core/tedge_lib/Cargo.toml
@@ -14,5 +14,7 @@ thiserror = "1.0.30"
 tokio = { version = "1.16.1", features = ["macros", "rt", "sync", "time"] }
 toml = "0.5.8"
 tracing = "0.1"
+humantime-serde = "1"
+indoc = "1.0.6"
 
 tedge_api = { path = "../tedge_api" }
diff --git a/crates/core/tedge_lib/src/config.rs b/crates/core/tedge_lib/src/config.rs
new file mode 100644
index 00000000..b06ef3ff
--- /dev/null
+++ b/crates/core/tedge_lib/src/config.rs
@@ -0,0 +1,56 @@
+#[derive(Copy, Clone, Debug, serde::Deserialize)]
+#[serde(transparent)]
+pub struct Humantime(#[serde(with = "humantime_serde")] std::time::Duration);
+
+impl Humantime {
+    pub fn into_duration(self) -> std::time::Duration {
+        self.0
+    }
+}
+
+impl tedge_api::AsConfig for Humantime {
+    fn as_config() -> tedge_api::ConfigDescription {
+        tedge_api::ConfigDescription::new(
+            "Duration-representing String".to_string(),
+            tedge_api::ConfigKind::String,
+            Some(indoc::indoc!{r#"
+                A String that represents a duration
+
+                ## Examples
+
+                A duration of one minute:
+
+                ```toml
+                "1min"
+                ```
+
+                A duration of 5 minutes and 2 nanoseconds:
+
+                ```toml
+                "5min 2ns"
+                ```
+
+                ## More information
+
+                For more information have a look at the documentation of
+                [the humantime crate](https://docs.rs/humantime).
+            "#}),
+        )
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn test_humantime_deser() {
+        let ts = r#"t = "1sec""#;
+
+        #[derive(serde::Deserialize)]
+        struct T {
+            t: super::Humantime,
+        }
+
+        let ht: T = toml::from_str(ts).unwrap();
+        assert_eq!(ht.t.0, std::time::Duration::from_secs(1));
+    }
+}
diff --git a/crates/core/tedge_lib/src/lib.rs b/crates/core/tedge_lib/src/lib.rs
index 279aad2b..4f52bd8a 100644
--- a/crates/core/tedge_lib/src/lib.rs
+++ b/crates/core/tedge_lib/src/lib.rs
@@ -1,3 +1,4 @@
+pub mod config;
 pub mod iter;
 pub mod mainloop;
 pub mod measurement;