Add DuplicateDevice (#33)

Cargo.toml

@@ -14,7 +14,7 @@ ctrlc = "3.2.5"
 figment = { version = "0.10", features = ["toml", "env", "json"] }
 futures = "0.3.29"
 human-bandwidth = { version = "0.1.1", features = ["serde"] }
-netem-trace = { version = "0.3.3", features = ["serde", "human", "mahimahi"] }
+netem-trace = { version = "0.3.4", features = ["serde", "human", "mahimahi"] }
 nix = "0.26.2"
 once_cell = "1.19"
 rand = "0.8.5"

rattan-core/src/config/duplicate.rs

@@ -0,0 +1,75 @@
+use figment::{
+    providers::{Format, Json, Toml},
+    Figment,
+};
+use netem_trace::{model::DuplicateTraceConfig, DuplicatePattern, DuplicateTrace};
+use rand::{rngs::StdRng, SeedableRng};
+use serde::{Deserialize, Serialize};
+
+use crate::{
+    core::DeviceFactory,
+    devices::{duplicate, Packet},
+    error::Error,
+};
+
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
+#[derive(Debug, Clone)]
+pub struct DuplicateDeviceBuildConfig {
+    pub pattern: DuplicatePattern,
+    pub seed: Option<u64>,
+}
+
+impl DuplicateDeviceBuildConfig {
+    pub fn into_factory<P: Packet>(
+        self,
+    ) -> impl DeviceFactory<duplicate::DuplicateDevice<P, StdRng>> {
+        move |handle| {
+            let _guard = handle.enter();
+            let rng = StdRng::seed_from_u64(self.seed.unwrap_or(42));
+            duplicate::DuplicateDevice::new(self.pattern, rng)
+        }
+    }
+}
+
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
+#[derive(Debug, Clone)]
+pub struct DuplicateReplayDeviceBuildConfig {
+    pub trace: String,
+    pub seed: Option<u64>,
+}
+
+impl DuplicateReplayDeviceBuildConfig {
+    fn get_trace(&self) -> Result<Box<dyn DuplicateTrace>, Error> {
+        let file_path = std::path::Path::new(&self.trace);
+        if let Some(ext) = file_path.extension() {
+            if ext == "json" {
+                let trace: Box<dyn DuplicateTraceConfig> = Figment::new()
+                    .merge(Json::file(file_path))
+                    .extract()
+                    .map_err(|e| Error::ConfigError(e.to_string()))?;
+                return Ok(trace.into_model());
+            } else if ext == "toml" {
+                let trace: Box<dyn DuplicateTraceConfig> = Figment::new()
+                    .merge(Toml::file(file_path))
+                    .extract()
+                    .map_err(|e| Error::ConfigError(e.to_string()))?;
+                return Ok(trace.into_model());
+            }
+        }
+        Err(Error::ConfigError(format!(
+            "Unknown trace file format: {:?}",
+            file_path
+        )))
+    }
+
+    pub fn into_factory<P: Packet>(
+        self,
+    ) -> impl DeviceFactory<duplicate::DuplicateReplayDevice<P, StdRng>> {
+        move |handle| {
+            let _guard = handle.enter();
+            let trace = self.get_trace()?;
+            let rng = StdRng::seed_from_u64(self.seed.unwrap_or(42));
+            duplicate::DuplicateReplayDevice::new(trace, rng)
+        }
+    }
+}

rattan-core/src/config/mod.rs

@@ -10,10 +10,12 @@ use crate::control::http::HttpConfig;
 
 mod bandwidth;
 mod delay;
+mod duplicate;
 mod loss;
 
 pub use bandwidth::*;
 pub use delay::*;
+pub use duplicate::*;
 pub use loss::*;
 
 /// Configuration for the whole Rattan system.
@@ -74,5 +76,7 @@ pub enum DeviceBuildConfig<P: Packet> {
     DelayReplay(DelayReplayDeviceBuildConfig),
     Loss(LossDeviceBuildConfig),
     LossReplay(LossReplayDeviceBuildConfig),
+    Duplicate(DuplicateDeviceBuildConfig),
+    DuplicateReplay(DuplicateReplayDeviceBuildConfig),
     Custom,
 }