Optionally disable pulling in the tokio runtime

.travis.yml

@@ -20,6 +20,8 @@ before_script:
 
 script:
   - cargo test
+  - cargo test --all-features
+  - cargo test --no-default-features
   - bash -c 'if [[ "$TRAVIS_RUST_VERSION" == "$CLIPPY_RUST_VERSION" ]]; then
       cargo clippy -- -D warnings;
     fi'

Cargo.toml

@@ -10,15 +10,29 @@ repository = "https://github.com/ctz/hyper-rustls"
 
 [dependencies]
 bytes = "0.4"
-ct-logs = "0.5"
+ct-logs = { version = "0.5", optional = true }
 futures = "0.1.21"
-hyper = "0.12.14"
+hyper = { version = "0.12.14", default-features = false }
 rustls = "0.15"
 tokio-io = "0.1.1"
 tokio-rustls = "0.9"
 webpki = "0.19.0"
-webpki-roots = "0.16"
+webpki-roots = { version = "0.16", optional = true }
 
 [dev-dependencies]
 tokio = "0.1"
 tokio-tcp = "0.1"
+
+[features]
+default = ["tokio-runtime"]
+tokio-runtime = ["hyper/runtime", "ct-logs", "webpki-roots"]
+
+[[example]]
+name = "client"
+path = "examples/client.rs"
+required-features = ["tokio-runtime"]
+
+[[example]]
+name = "server"
+path = "examples/server.rs"
+required-features = ["tokio-runtime"]

src/connector.rs

@@ -1,13 +1,12 @@
-use ct_logs;
 use futures::{Future, Poll};
 use hyper::client::connect::{self, Connect};
+#[cfg(feature = "tokio-runtime")]
 use hyper::client::HttpConnector;
 use rustls::{ClientConfig, Session};
 use std::sync::Arc;
 use std::{fmt, io};
 use tokio_rustls::TlsConnector;
 use webpki::{DNSName, DNSNameRef};
-use webpki_roots;
 
 use stream::MaybeHttpsStream;
 
@@ -18,11 +17,15 @@ pub struct HttpsConnector<T> {
     tls_config: Arc<ClientConfig>,
 }
 
+#[cfg(feature = "tokio-runtime")]
 impl HttpsConnector<HttpConnector> {
     /// Construct a new `HttpsConnector`.
     ///
     /// Takes number of DNS worker threads.
     pub fn new(threads: usize) -> Self {
+        use ct_logs;
+        use webpki_roots;
+
         let mut http = HttpConnector::new(threads);
         http.enforce_http(false);
         let mut config = ClientConfig::new();

src/lib.rs

@@ -5,32 +5,36 @@
 //! ## Example
 //!
 //! ```no_run
-//! extern crate hyper;
-//! extern crate hyper_rustls;
-//! extern crate tokio;
-//!
+//! # #[cfg(feature = "tokio-runtime")]
+//! # extern crate hyper;
+//! #
+//! # #[cfg(feature = "tokio-runtime")]
+//! # fn main() {
 //! use hyper::{Body, Client, StatusCode, Uri};
 //!
-//! fn main() {
-//!     let mut rt = tokio::runtime::Runtime::new().unwrap();
-//!     let url = ("https://hyper.rs").parse().unwrap();
-//!     let https = hyper_rustls::HttpsConnector::new(4);
+//! let mut rt = tokio::runtime::Runtime::new().unwrap();
+//! let url = ("https://hyper.rs").parse().unwrap();
+//! let https = hyper_rustls::HttpsConnector::new(4);
 //!
-//!     let client: Client<_, hyper::Body> = Client::builder().build(https);
+//! let client: Client<_, hyper::Body> = Client::builder().build(https);
 //!
-//!     let res = rt.block_on(client.get(url)).unwrap();
-//!     assert_eq!(res.status(), StatusCode::OK);
-//! }
+//! let res = rt.block_on(client.get(url)).unwrap();
+//! assert_eq!(res.status(), StatusCode::OK);
+//! # }
+//! # #[cfg(not(feature = "tokio-runtime"))]
+//! # fn main() {}
 //! ```
 
 extern crate bytes;
+#[cfg(feature = "tokio-runtime")]
 extern crate ct_logs;
 extern crate futures;
 extern crate hyper;
 extern crate rustls;
 extern crate tokio_io;
 extern crate tokio_rustls;
 extern crate webpki;
+#[cfg(feature = "tokio-runtime")]
 extern crate webpki_roots;
 
 mod connector;