switch to hyper while staying 100% compatible

Author: Stephan Dilly

Cargo.toml

@@ -15,19 +15,21 @@ edition = "2018"
 
 [features]
 default = ["native-tls"]
-native-tls = ["reqwest/native-tls"]
-rustls = ["reqwest/rustls-tls"]
-vendored-tls = ["reqwest/native-tls-vendored"]
+native-tls = ["hyper-tls"]
+rustls = ["hyper-rustls"]
+vendored-tls = ["hyper-tls/vendored"]
 
 [dependencies]
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 erased-serde = "0.3"
-reqwest = {version = "0.11.0", features = ["json"], default-features=false}
 chrono = "0.4"
 log = "0.4"
+hyper = { version = "0.14", features = ["client", "http1"] }
+hyper-tls = { version = "0.5", optional = true }
+hyper-rustls = { version = "0.22", optional = true }
 
 [dev-dependencies]
-argparse = "0.2.1"
-tokio = { version = "1.0", features = ["rt-multi-thread", "macros"] }
-pretty_env_logger = "0.3"
+argparse = "0.2"
+tokio = { version = "1.6", features = ["rt-multi-thread", "macros"] }
+pretty_env_logger = "0.4"

src/client/mod.rs

@@ -1,15 +1,17 @@
 pub mod response;
 
+use hyper::{Body, Request, StatusCode};
+#[cfg(feature = "hyper-rustls")]
+use hyper_rustls::HttpsConnector;
+#[cfg(feature = "hyper-tls")]
+use hyper_tls::HttpsConnector;
+
 pub use crate::client::response::*;
 
 use crate::message::Message;
-use reqwest::header::{AUTHORIZATION, CONTENT_LENGTH, CONTENT_TYPE, RETRY_AFTER};
-use reqwest::{Body, StatusCode};
 
 /// An async client for sending the notification payload.
-pub struct Client {
-    http_client: reqwest::Client,
-}
+pub struct Client {}
 
 impl Default for Client {
     fn default() -> Self {
@@ -19,40 +21,42 @@ impl Default for Client {
 
 impl Client {
     /// Get a new instance of Client.
-    pub fn new() -> Client {
-        let http_client = reqwest::ClientBuilder::new()
-            .pool_max_idle_per_host(std::usize::MAX)
-            .build()
-            .unwrap();
-
-        Client { http_client }
+    pub fn new() -> Self {
+        Self {}
     }
 
     /// Try sending a `Message` to FCM.
     pub async fn send(&self, message: Message<'_>) -> Result<FcmResponse, FcmError> {
         let payload = serde_json::to_vec(&message.body).unwrap();
 
-        let request = self
-            .http_client
-            .post("https://fcm.googleapis.com/fcm/send")
-            .header(CONTENT_TYPE, "application/json")
-            .header(CONTENT_LENGTH, format!("{}", payload.len() as u64).as_bytes())
-            .header(AUTHORIZATION, format!("key={}", message.api_key).as_bytes())
-            .body(Body::from(payload))
-            .build()?;
-        let response = self.http_client.execute(request).await?;
+        #[cfg(feature = "hyper-tls")]
+        let connector = HttpsConnector::new();
+
+        #[cfg(feature = "hyper-rustls")]
+        let connector = HttpsConnector::with_native_roots();
+
+        let client = hyper::Client::builder().build::<_, Body>(connector);
+        let request = Request::builder()
+            .method("POST")
+            .uri("https://fcm.googleapis.com/fcm/send")
+            .header("Content-Type", "application/json")
+            .header("Content-Length", format!("{}", payload.len() as u64))
+            .header("Athorization", format!("key={}", message.api_key))
+            .body(Body::from(payload))?;
+        let response = client.request(request).await?;
 
         let response_status = response.status();
 
         let retry_after = response
             .headers()
-            .get(RETRY_AFTER)
+            .get("Retry-After")
             .and_then(|ra| ra.to_str().ok())
             .and_then(|ra| ra.parse::<RetryAfter>().ok());
 
         match response_status {
             StatusCode::OK => {
-                let fcm_response: FcmResponse = response.json().await.unwrap();
+                let buf = hyper::body::to_bytes(response).await?;
+                let fcm_response: FcmResponse = serde_json::from_slice(&buf)?;
 
                 match fcm_response.error {
                     Some(ErrorReason::Unavailable) => Err(response::FcmError::ServerError(retry_after)),

src/client/response.rs

@@ -158,8 +158,20 @@ impl fmt::Display for FcmError {
     }
 }
 
-impl From<reqwest::Error> for FcmError {
-    fn from(_: reqwest::Error) -> Self {
+impl From<serde_json::Error> for FcmError {
+    fn from(_: serde_json::Error) -> Self {
+        Self::ServerError(None)
+    }
+}
+
+impl From<hyper::Error> for FcmError {
+    fn from(_: hyper::Error) -> Self {
+        Self::ServerError(None)
+    }
+}
+
+impl From<hyper::http::Error> for FcmError {
+    fn from(_: hyper::http::Error) -> Self {
         Self::ServerError(None)
     }
 }