0.1.1 page navigation

src/v1/macros.rs

@@ -0,0 +1,59 @@
+macro_rules! implement_pagination_v1 {
+    ($t:ty) => {
+        impl $t {
+            async fn follow_link(client : &Client, url : &str) -> Result<Self, error::Error> {
+                let res = reqwest::Client::new()
+                    .get(url)
+                    .header("Authorization", client.auth_header())
+                    .send()
+                    .await
+                    .map_err(error::Error::Request)?;
+
+                match res.status() {
+                    reqwest::StatusCode::OK => {
+                        let body = res.text().await.map_err(error::Error::BodyRead)?;
+                        let response : Self = serde_json::from_str(&body).map_err(error::Error::Json)?;
+
+                        Ok(response)
+                    },
+                    _ => {
+                        let body = res.text().await.map_err(error::Error::BodyRead)?;
+                        let error : error::ErrorResponse = serde_json::from_str(&body).map_err(error::Error::Json)?;
+
+                        Err(error::Error::Api(error))
+                    }
+                }
+            }
+
+            /// Follows the link to the next page, returns None of the next page does not exist.
+            pub async fn next(&self, client : &Client) -> Option<Result<Self, error::Error>> {
+                match
+                    self
+                    .links
+                    .next
+                    .as_ref()
+                    .map(|url| Self::follow_link(client, &url)) {
+                        
+                    Some(data) => Some(data.await),
+                    None => None,
+                }
+            }
+
+            /// Follows the link to the previous page, returns None of the previous page does not exist.
+            pub async fn prev(&self, client : &Client) -> Option<Result<Self, error::Error>> {
+                match
+                    self
+                    .links
+                    .prev
+                    .as_ref()
+                    .map(|url| Self::follow_link(client, &url)) {
+                        
+                    Some(data) => Some(data.await),
+                    None => None,
+                }
+            }
+        }
+    }
+}
+
+