6 files changed, 109 insertions, 0 deletions
diff --git a/src/client/connector.rs b/src/client/connector.rs
new file mode 100644
index 0000000..a846939
--- /dev/null
+++ b/src/client/connector.rs
@@ -0,0 +1,41 @@
+mod connectors;
+pub(crate) mod manager;
+
+use std::{
+    sync::mpsc::{channel, Receiver, Sender},
+    thread::sleep,
+    time,
+};
+
+struct Channel<C: Connection> {
+    sender: Sender<C::Success>,
+    receiver: Receiver<()>,
+}
+
+impl<C: Connection> Channel<C> {
+    fn new() -> Self {
+        let (sender, _): (Sender<C::Success>, Receiver<C::Success>) = channel();
+        let (_, receiver): (Sender<()>, Receiver<()>) = channel();
+        Self { sender, receiver }
+    }
+}
+
+trait Connection {
+    type Err: std::fmt::Display;
+    type Success: std::fmt::Display = String;
+
+    fn test_connection(&self) -> Result<bool, Self::Err>;
+
+    // should use channel to notify update
+    async fn update(&self) -> Option<Result<Self::Success, Self::Err>>; // None if no update(content is same)
+
+    async fn r#loop(&self) -> ! {
+        loop {
+            if let Some(Err(e)) = self.update().await {
+                eprintln!("Error: {}", e)
+            }
+
+            sleep(time::Duration::from_secs(1));
+        }
+    }
+}
diff --git a/src/client/connector/connectors.rs b/src/client/connector/connectors.rs
new file mode 100644
index 0000000..3810a4a
--- /dev/null
+++ b/src/client/connector/connectors.rs
@@ -0,0 +1,5 @@
+mod httpconnector;
+
+pub(crate) enum Connectors<'a> {
+    Http(httpconnector::HTTPConnector<'a>),
+}
diff --git a/src/client/connector/connectors/httpconnector.rs b/src/client/connector/connectors/httpconnector.rs
new file mode 100644
index 0000000..97f79dd
--- /dev/null
+++ b/src/client/connector/connectors/httpconnector.rs
@@ -0,0 +1,45 @@
+use std::net::AddrParseError;
+
+use crate::connector::*;
+
+pub(crate) struct HTTPConnector<'a> {
+    prev: String,
+    url: &'a str,
+    channel: Channel<Self>,
+}
+
+impl<'a> HTTPConnector<'a> {
+    fn new(url: &'a str) -> Result<Self, AddrParseError> {
+        Ok(Self {
+            prev: String::new(),
+            url,
+            channel: Channel::new(),
+        })
+    }
+}
+
+impl Connection for HTTPConnector<'_> {
+    type Err = reqwest::Error;
+
+    fn test_connection(&self) -> std::result::Result<bool, reqwest::Error> {
+        Ok(true)
+    }
+
+    async fn update(&self) -> Option<Result<Self::Success, Self::Err>> {
+        let res = match reqwest::get(self.url).await {
+            Ok(resp) => match resp.text().await {
+                Ok(text) => text,
+                Err(e) => return Some(Err(e)),
+            },
+            Err(e) => return Some(Err(e)),
+        };
+
+        if res == self.prev {
+            return None;
+        }
+
+        _ = self.channel.sender.send(res.clone()); // don't care if receiver is dropped
+
+        Some(Ok(res))
+    }
+}
diff --git a/src/client/connector/manager.rs b/src/client/connector/manager.rs
new file mode 100644
index 0000000..9ca8a24
--- /dev/null
+++ b/src/client/connector/manager.rs
@@ -0,0 +1,12 @@
+use crate::connector::connectors;
+use std::thread;
+
+pub(crate) struct ConnectorManager<'a> {
+    connector: connectors::Connectors<'a>,
+}
+
+impl<'a> ConnectorManager<'a> {
+    pub(crate) fn new(connector: connectors::Connectors<'a>) -> Self {
+        Self { connector }
+    }
+}
diff --git a/src/client/main.rs b/src/client/main.rs
new file mode 100644
index 0000000..f514a74
--- /dev/null
+++ b/src/client/main.rs
@@ -0,0 +1,6 @@
+#![feature(associated_type_defaults)]
+mod connector;
+
+fn main() {
+    // connector::manager::ConnectorManager::new();
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/src/lib.rs