From b5a659f8a7315506a101a9fe6e73c623c019e4a3 Mon Sep 17 00:00:00 2001
From: Callum Leslie <git@cleslie.uk>
Date: Tue, 2 Sep 2025 16:22:20 +0100
Subject: [PATCH] feat: add message types to be sent over channels

---
 src/lib.rs   |  5 +++++
 src/types.rs | 25 +++++++++++++++++++++++++
 2 files changed, 30 insertions(+)
 create mode 100644 src/types.rs

diff --git a/src/lib.rs b/src/lib.rs
index f5e9443..5e53dcf 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,3 +1,8 @@
 #![doc = include_str!("../README.md")]
 
 pub mod error;
+pub mod types;
+
+// Re-exports
+pub use error::Error;
+pub use types::ValueSource;
diff --git a/src/types.rs b/src/types.rs
new file mode 100644
index 0000000..f56fb85
--- /dev/null
+++ b/src/types.rs
@@ -0,0 +1,25 @@
+/// Request messages sent from consumer to producer
+pub enum Request {
+    GetValue,
+    Close,
+}
+
+/// Response messages sent from producer to consumer
+pub enum Response<T> {
+    Value(T),
+    NoSource,
+    Closed,
+}
+
+/// Represents the source of values: either static or dynamic
+pub enum ValueSource<T> {
+    Static(T),
+    Dynamic(Box<dyn Fn() -> T + Send + Sync + 'static>),
+    None,
+}
+
+/// Internal channel state shared between producer and consumer
+pub struct ChannelState<T> {
+    pub source: ValueSource<T>,
+    pub closed: bool,
+}