chore(provider): make websockets optional

ethers-providers/Cargo.toml

@@ -26,33 +26,35 @@ url = { version = "2.1.1", default-features = false }
 # required for implementing stream on the filters
 futures-core = { version = "0.3.5", default-features = false }
 futures-util = { version = "0.3.5", default-features = false }
+futures-timer = { version = "3.0.2", default-features = false }
 pin-project = { version = "0.4.20", default-features = false }
-async-tungstenite = { version = "0.6.0", default-features = false }
 
 # ws support async-std and tokio runtimes for the convenience methods
+async-tungstenite = { version = "0.6.0", default-features = false, optional = true }
 async-std = { version = "1.6.2", default-features = false, optional = true }
 tokio = { version = "0.2.21", default-features = false, optional = true }
 
 # needed for tls
 real-tokio-native-tls = { package = "tokio-native-tls", version = "0.1.0", optional = true }
 async-tls = { version = "0.7.0", optional = true }
-futures-timer = "3.0.2"
 
 [dev-dependencies]
 ethers = { version = "0.1.3", path = "../ethers" }
 
 rustc-hex = "2.1.0"
 tokio = { version = "0.2.21", default-features = false, features = ["rt-core", "macros"] }
 async-std = { version = "1.6.2", default-features = false, features = ["attributes"] }
-async-tungstenite = { version = "0.6.0", features = ["tokio-runtime"] }
+async-tungstenite = { version = "0.6.0", default-features = false, features = ["tokio-runtime"] }
 
 [features]
 # slightly opinionated, but for convenience we default to tokio-tls
 # to allow websockets w/ TLS support
 default = ["tokio-tls"]
 celo = ["ethers-core/celo"]
+ws = ["async-tungstenite"]
 
 tokio-runtime = [
+    "ws",
     "tokio",
     "async-tungstenite/tokio-runtime"
 ]
@@ -63,6 +65,7 @@ tokio-tls = [
 ]
 
 async-std-runtime = [
+    "ws",
     "async-std",
     "async-tungstenite/async-std-runtime"
 ]

ethers-providers/src/lib.rs

@@ -100,7 +100,7 @@
 //! # }
 //! ```
 mod transports;
-pub use transports::{Http, Ws};
+pub use transports::*;
 
 mod provider;
 

ethers-providers/src/transports/mod.rs

@@ -3,5 +3,7 @@ mod common;
 mod http;
 pub use http::Provider as Http;
 
+#[cfg(feature = "ws")]
 mod ws;
+#[cfg(feature = "ws")]
 pub use ws::Provider as Ws;

ethers/Cargo.toml

@@ -49,7 +49,7 @@ ethers-signers = { version = "0.1.3", path = "../ethers-signers", optional = tru
 
 [dev-dependencies]
 ethers-contract = { version = "0.1.3", path = "../ethers-contract", features = ["abigen"] }
-ethers-providers = { version = "0.1.3", path = "../ethers-providers", features = ["tokio-runtime"] }
+ethers-providers = { version = "0.1.3", path = "../ethers-providers" }
 
 anyhow = "1.0.31"
 rand = "0.7"