2 files changed, 30 insertions, 18 deletions

diff --git a/src/client/connector.rs b/src/client/connector.rs
index cae944b..88b1939 100644
--- a/src/client/connector.rs
+++ b/src/client/connector.rs
@@ -15,14 +15,24 @@ pub(crate) trait Connection {
     type Err: std::fmt::Display;
 
     // should use channel to notify update
-    fn update(&self) -> Option<Result<Self::Ok, Self::Err>>; // None if no update(content is same)
+    fn update(&self) -> Result<Self::Ok, Self::Err>; // None if no update(content is same)
 
     fn ntfy(&self, data: String);
 
-    fn r#loop(&self) -> ! {
+    fn is_prev(&mut self, str: &Self::Ok) -> bool;
+
+    fn r#loop(&mut self) -> ! {
         loop {
+            // tradeoff: if I put this at the ened of the loop, then the continue would just skip it, and continue doing update() until with no waiting, this wastes lot of cpu/IO
+            // however, of course we can add a manual sleep before it continue and put this in the end, but that's code duplication
+            // the cons of the current approch is that the first time we've entered, it would start sleeping
+            sleep(Duration::from_millis(500));
             match self.update() {
-                Some(Result::Ok(s)) => {
+                Result::Ok(s) => {
+                    if self.is_prev(&s) {
+                        continue;
+                    }
+
                     let mut it = s.as_ref().split_whitespace();
                     let task = match it.next() {
                         Some(t) => t,
@@ -39,11 +49,8 @@ pub(crate) trait Connection {
                             .unwrap(),
                     );
                 }
-                Some(Result::Err(e)) => eprintln!("Error: {}", e),
-                _ => {}
+                Result::Err(e) => eprintln!("Error: {}", e),
             }
-
-            sleep(Duration::from_millis(500));
         }
     }
 }
diff --git a/src/client/connector/connectors/httpconnector.rs b/src/client/connector/connectors/httpconnector.rs
index 923df94..e391771 100644
--- a/src/client/connector/connectors/httpconnector.rs
+++ b/src/client/connector/connectors/httpconnector.rs
@@ -1,12 +1,12 @@
 use reqwest::{Error, StatusCode, Url, blocking::Client};
 
-use crate::connector::*;
+use crate::connector::{self, *};
 use std::{thread::sleep, time::Duration};
 
 pub(crate) struct HTTPConnector {
-    prev: String,
     url: Url,
     client: Client,
+    prev: <HTTPConnector as connector::Connection>::Ok,
 }
 
 impl HTTPConnector {
@@ -37,7 +37,7 @@ impl std::fmt::Display for Err {
 impl Connection for HTTPConnector {
     type Err = Err;
 
-    fn update(&self) -> Option<Result<Self::Ok, Self::Err>> {
+    fn update(&self) -> Result<Self::Ok, Self::Err> {
         let resp = match self.client.get(self.url.as_str()).send() {
             Ok(resp) => match resp.status() {
                 StatusCode::TOO_MANY_REQUESTS => {
@@ -46,25 +46,30 @@ impl Connection for HTTPConnector {
                 }
                 status => {
                     if !status.is_success() {
-                        return Some(Result::Err(Err::StatusCode(status)));
+                        return Result::Err(Err::StatusCode(status));
                     }
                     match resp.text() {
                         Ok(text) => text,
-                        Err(e) => return Some(Result::Err(Err::Reqwest(e))),
+                        Err(e) => return Result::Err(Err::Reqwest(e)),
                     }
                 }
             },
-            Err(e) => return Some(Result::Err(Err::Reqwest(e))),
+            Err(e) => return Result::Err(Err::Reqwest(e)),
         };
 
-        if resp == self.prev {
-            return None;
-        }
-
-        Some(Result::Ok(resp))
+        Result::Ok(resp)
     }
 
     fn ntfy(&self, data: String) {
         println!("{}", data)
     }
+
+    fn is_prev(&mut self, str: &Self::Ok) -> bool {
+        if str == &self.prev {
+            return true;
+        } else {
+            self.prev = str.to_owned()
+        }
+        false
+    }
 }