Add `no_cache` for `cache_control` attribute #1051

derive/src/args.rs

@@ -17,6 +17,7 @@ use crate::validators::Validators;
 pub struct CacheControl {
     public: bool,
     private: bool,
+    pub no_cache: bool,
     pub max_age: usize,
 }
 
@@ -25,6 +26,7 @@ impl Default for CacheControl {
         Self {
             public: true,
             private: false,
+            no_cache: false,
             max_age: 0,
         }
     }

derive/src/complex_object.rs

@@ -189,7 +189,11 @@ pub fn generate(
             };
             let cache_control = {
                 let public = method_args.cache_control.is_public();
-                let max_age = method_args.cache_control.max_age;
+                let max_age = if method_args.cache_control.no_cache {
+                    -1
+                } else {
+                    method_args.cache_control.max_age as i32
+                };
                 quote! {
                     #crate_name::CacheControl {
                         public: #public,

derive/src/object.rs

@@ -335,7 +335,11 @@ pub fn generate(
                 };
                 let cache_control = {
                     let public = method_args.cache_control.is_public();
-                    let max_age = method_args.cache_control.max_age;
+                    let max_age = if method_args.cache_control.no_cache {
+                        -1
+                    } else {
+                        method_args.cache_control.max_age as i32
+                    };
                     quote! {
                         #crate_name::CacheControl {
                             public: #public,
@@ -583,7 +587,11 @@ pub fn generate(
 
     let cache_control = {
         let public = object_args.cache_control.is_public();
-        let max_age = object_args.cache_control.max_age;
+        let max_age = if object_args.cache_control.no_cache {
+            -1
+        } else {
+            object_args.cache_control.max_age as i32
+        };
         quote! {
             #crate_name::CacheControl {
                 public: #public,

derive/src/simple_object.rs

@@ -161,7 +161,11 @@ pub fn generate(object_args: &args::SimpleObject) -> GeneratorResult<TokenStream
 
         let cache_control = {
             let public = field.cache_control.is_public();
-            let max_age = field.cache_control.max_age;
+            let max_age = if field.cache_control.no_cache {
+                -1
+            } else {
+                field.cache_control.max_age as i32
+            };
             quote! {
                 #crate_name::CacheControl {
                     public: #public,
@@ -275,7 +279,11 @@ pub fn generate(object_args: &args::SimpleObject) -> GeneratorResult<TokenStream
 
     let cache_control = {
         let public = object_args.cache_control.is_public();
-        let max_age = object_args.cache_control.max_age;
+        let max_age = if object_args.cache_control.no_cache {
+            -1
+        } else {
+            object_args.cache_control.max_age as i32
+        };
         quote! {
             #crate_name::CacheControl {
                 public: #public,

src/registry/cache_control.rs

@@ -1,4 +1,4 @@
-/// Cache control values
+/// Cache control value
 ///
 /// # Examples
 ///
@@ -18,6 +18,11 @@
 ///     async fn value2(&self) -> i32 {
 ///         0
 ///     }
+///
+///     #[graphql(cache_control(no_cache))]
+///     async fn value3(&self) -> i32 {
+///         0
+///     }
 /// }
 ///
 /// # tokio::runtime::Runtime::new().unwrap().block_on(async {
@@ -34,6 +39,7 @@
 ///         max_age: 30
 ///     }
 /// );
+///
 /// assert_eq!(
 ///     schema
 ///         .execute("{ value2 }")
@@ -46,6 +52,7 @@
 ///         max_age: 60
 ///     }
 /// );
+///
 /// assert_eq!(
 ///     schema
 ///         .execute("{ value1 value2 }")
@@ -58,6 +65,19 @@
 ///         max_age: 30
 ///     }
 /// );
+///
+/// assert_eq!(
+///     schema
+///         .execute("{ value1 value2 value3 }")
+///         .await
+///         .into_result()
+///         .unwrap()
+///         .cache_control,
+///     CacheControl {
+///         public: false,
+///         max_age: -1
+///     }
+/// );
 /// # });
 /// ```
 #[derive(Clone, Copy, PartialEq, Eq, Debug)]
@@ -65,8 +85,8 @@ pub struct CacheControl {
     /// Scope is public, default is true.
     pub public: bool,
 
-    /// Cache max age, default is 0.
-    pub max_age: usize,
+    /// Cache max age, `-1` represent `no-cache`, default is 0.
+    pub max_age: i32,
 }
 
 impl Default for CacheControl {
@@ -82,12 +102,23 @@ impl CacheControl {
     /// Get 'Cache-Control' header value.
     #[must_use]
     pub fn value(&self) -> Option<String> {
-        if self.max_age > 0 {
-            Some(format!(
-                "max-age={}{}",
-                self.max_age,
-                if self.public { "" } else { ", private" }
-            ))
+        let mut value = if self.max_age > 0 {
+            format!("max-age={}", self.max_age)
+        } else if self.max_age == -1 {
+            "no-cache".to_string()
+        } else {
+            String::new()
+        };
+
+        if !self.public {
+            if !value.is_empty() {
+                value += ", ";
+            }
+            value += "private";
+        }
+
+        if !value.is_empty() {
+            Some(value)
         } else {
             None
         }
@@ -99,13 +130,75 @@ impl CacheControl {
     pub(crate) fn merge(self, other: &CacheControl) -> CacheControl {
         CacheControl {
             public: self.public && other.public,
-            max_age: if self.max_age == 0 {
-                other.max_age
-            } else if other.max_age == 0 {
-                self.max_age
-            } else {
-                self.max_age.min(other.max_age)
+            max_age: match (self.max_age, other.max_age) {
+                (-1, _) => -1,
+                (_, -1) => -1,
+                (a, 0) => a,
+                (0, b) => b,
+                (a, b) => a.min(b),
             },
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn to_value() {
+        assert_eq!(
+            CacheControl {
+                public: true,
+                max_age: 0,
+            }
+            .value(),
+            None
+        );
+
+        assert_eq!(
+            CacheControl {
+                public: false,
+                max_age: 0,
+            }
+            .value(),
+            Some("private".to_string())
+        );
+
+        assert_eq!(
+            CacheControl {
+                public: false,
+                max_age: 10,
+            }
+            .value(),
+            Some("max-age=10, private".to_string())
+        );
+
+        assert_eq!(
+            CacheControl {
+                public: true,
+                max_age: 10,
+            }
+            .value(),
+            Some("max-age=10".to_string())
+        );
+
+        assert_eq!(
+            CacheControl {
+                public: true,
+                max_age: -1,
+            }
+            .value(),
+            Some("no-cache".to_string())
+        );
+
+        assert_eq!(
+            CacheControl {
+                public: false,
+                max_age: -1,
+            }
+            .value(),
+            Some("no-cache, private".to_string())
+        );
+    }
+}