diff --git a/src/lib.rs b/src/lib.rs
index c587b50..adaf95a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -2,7 +2,7 @@
 
 pub mod types;
 
-use crate::types::Message;
+use crate::types::{BroadcastMessage, Message, TopologyMessage};
 use rand::{rngs::SmallRng, Rng, SeedableRng};
 use std::{
     cell::RefCell,
@@ -23,6 +23,8 @@ pub struct Malestorm<'a> {
 struct Node {
     id: String,
     nodes: Vec<String>,
+    broadcasts: Vec<i64>,
+    topology: HashMap<String, Vec<String>>,
     rng: SmallRng,
 }
 
@@ -41,6 +43,8 @@ impl<'a> Default for Malestorm<'a> {
             node: RefCell::new(Node {
                 id: String::new(),
                 nodes: Vec::new(),
+                broadcasts: Vec::new(),
+                topology: HashMap::new(),
                 rng: SmallRng::seed_from_u64(seed.as_secs()),
             }),
             io: MalestormIo {
@@ -125,6 +129,23 @@ impl<'a> Malestorm<'a> {
         node.nodes = nodes;
     }
 
+    pub fn record_broadcast(&self, broadcast: BroadcastMessage) {
+        let mut node = self.node.borrow_mut();
+        node.broadcasts.push(broadcast.message);
+    }
+
+    pub fn read_broadcasts(&self) -> Vec<i64> {
+        let node = self.node.borrow();
+        node.broadcasts.clone()
+    }
+
+    // TODO: this'll probably be more complex later on if we have ops to update toplogy
+    pub fn save_toplogy(&self, msg: TopologyMessage) {
+        let mut node = self.node.borrow_mut();
+
+        node.topology = msg.topology;
+    }
+
     pub fn generate_client_id(&self) -> String {
         let mut node = self.node.borrow_mut();
 
diff --git a/src/main.rs b/src/main.rs
index 618b687..bb39d1f 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,5 +1,8 @@
 use distributed_systems_flyio::{
-    types::{EchoMessage, GenerateMessage, InitMessage, Message},
+    types::{
+        BroadcastMessage, EchoMessage, GenerateMessage, InitMessage, Message, ReadMessage,
+        TopologyMessage,
+    },
     Malestorm,
 };
 use std::rc::Rc;
@@ -54,5 +57,52 @@ fn main() {
                 .map_err(|e| format!("generate: error in writing response: {}", e))
         },
     );
+
+    program.register(
+        "broadcast",
+        |mut msg: Message, program: Rc<Malestorm>| -> Result<(), String> {
+            let body: BroadcastMessage = serde_json::from_value(msg.body.message_body.take())
+                .map_err(|e| format!("error in parsing response body: {}", e))?;
+            msg.body.message_type = "broadcast_ok".into();
+
+            program.record_broadcast(body);
+
+            program
+                .reply(msg)
+                .map_err(|e| format!("broadcast: error in writing response: {}", e))
+        },
+    );
+
+    program.register(
+        "read",
+        |mut msg: Message, program: Rc<Malestorm>| -> Result<(), String> {
+            msg.body.message_type = "read_ok".into();
+
+            let body = serde_json::to_value(ReadMessage {
+                messages: program.read_broadcasts(),
+            })
+            .map_err(|e| format!("error in marshalling response: {}", e))?;
+            msg.body.message_body = body;
+
+            program
+                .reply(msg)
+                .map_err(|e| format!("broadcast: error in writing response: {}", e))
+        },
+    );
+
+    program.register(
+        "topology",
+        |mut msg: Message, program: Rc<Malestorm>| -> Result<(), String> {
+            let topology: TopologyMessage = serde_json::from_value(msg.body.message_body.take())
+                .map_err(|e| format!("error in  parsing response: {}", e))?;
+
+            msg.body.message_type = "topology_ok".into();
+            program.save_toplogy(topology);
+
+            program
+                .reply(msg)
+                .map_err(|e| format!("broadcast: error in writing response: {}", e))
+        },
+    );
     program.run();
 }
diff --git a/src/types.rs b/src/types.rs
index a2a01ed..e130897 100644
--- a/src/types.rs
+++ b/src/types.rs
@@ -1,3 +1,5 @@
+use std::collections::HashMap;
+
 use serde::{Deserialize, Serialize};
 
 #[derive(Debug, Serialize, Deserialize)]
@@ -41,6 +43,24 @@ pub struct GenerateMessage {
     pub id: String,
 }
 
+#[derive(Debug, Serialize, Deserialize)]
+#[serde(deny_unknown_fields)]
+pub struct BroadcastMessage {
+    pub message: i64,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+#[serde(deny_unknown_fields)]
+pub struct ReadMessage {
+    pub messages: Vec<i64>,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+#[serde(deny_unknown_fields)]
+pub struct TopologyMessage {
+    pub topology: HashMap<String, Vec<String>>,
+}
+
 #[cfg(test)]
 mod test {