make async-trait optional

Author: Emilgardis

Cargo.toml

@@ -12,7 +12,7 @@ readme = "README.md"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 [features]
 default = []
-client = []
+client = ["dep:async-trait"]
 reqwest = ["dep:reqwest", "client"]
 surf_client_curl = ["surf", "surf/curl-client"]
 surf = ["dep:surf", "dep:http-types", "http-types?/hyperium_http", "client"]
@@ -24,7 +24,7 @@ thiserror = "1.0.29"
 displaydoc = "0.2.3"
 serde = { version = "1.0.130", features = ["derive"] }
 serde_json = "1.0.68"
-async-trait = "0.1.51"
+async-trait = { version = "0.1.51", optional = true }
 http = "0.2.5"
 surf = { version = "2.3.1", optional = true, default-features = false }
 reqwest = { version = "0.11.4", optional = true, default-features = false }

src/tokens.rs

@@ -32,7 +32,7 @@ pub enum BearerTokenType {
 }
 
 /// Trait for twitch tokens to get fields and generalize over [AppAccessToken] and [UserToken]
-#[async_trait::async_trait]
+#[cfg_attr(feature = "client", async_trait::async_trait)]
 pub trait TwitchToken {
     /// Get the type of token.
     fn token_type() -> BearerTokenType;
@@ -120,7 +120,7 @@ pub trait TwitchToken {
     }
 }
 
-#[async_trait::async_trait]
+#[cfg_attr(feature = "client", async_trait::async_trait)]
 impl<T: TwitchToken + Send> TwitchToken for Box<T> {
     fn token_type() -> BearerTokenType { T::token_type() }
 

src/tokens/app_access_token.rs

@@ -46,7 +46,7 @@ impl std::fmt::Debug for AppAccessToken {
     }
 }
 
-#[async_trait::async_trait]
+#[cfg_attr(feature = "client", async_trait::async_trait)]
 impl TwitchToken for AppAccessToken {
     fn token_type() -> super::BearerTokenType { super::BearerTokenType::AppAccessToken }
 

src/tokens/user_token.rs

@@ -229,7 +229,7 @@ impl UserToken {
     pub fn set_secret(&mut self, secret: Option<ClientSecret>) { self.client_secret = secret }
 }
 
-#[async_trait::async_trait]
+#[cfg_attr(feature = "client", async_trait::async_trait)]
 impl TwitchToken for UserToken {
     fn token_type() -> super::BearerTokenType { super::BearerTokenType::UserToken }