Put secio behind a feature flag in the facade (#219)

* Put secio behind a feature flag in the facade

* Define the features required by examples

* Test both with and without Cargo features

.circleci/config.yml

@@ -32,8 +32,11 @@ jobs:
           name: Prepare docker container for building
           command: docker build --pull --no-cache -t rust-libp2p -f .circleci/images/rust-libp2p/Dockerfile .
       - run:
-          name: Run tests, inside a docker image
+          name: Run tests, inside a docker image, with no feature
-          command: docker run --rm -v "/cache/cargo/registry:/usr/local/cargo/registry" -v "/cache/target:/app/target" -it rust-libp2p cargo test
+          command: docker run --rm -v "/cache/cargo/registry:/usr/local/cargo/registry" -v "/cache/target:/app/target" -it rust-libp2p cargo test --no-default-features
+      - run:
+          name: Run tests, inside a docker image, with all features
+          command: docker run --rm -v "/cache/cargo/registry:/usr/local/cargo/registry" -v "/cache/target:/app/target" -it rust-libp2p cargo test --all-features
       - save_cache:
           key: test-cache
           paths:

libp2p/Cargo.toml

@@ -3,6 +3,9 @@ name = "libp2p"
 version = "0.1.0"
 authors = ["Parity Technologies <admin@parity.io>"]
 
+[features]
+default = ["libp2p-secio"]
+
 [dependencies]
 bytes = "0.4"
 futures = "0.1"
@@ -21,7 +24,7 @@ tokio-io = "0.1"
 
 [target.'cfg(not(target_os = "emscripten"))'.dependencies]
 libp2p-dns = { path = "../dns" }
-libp2p-secio = { path = "../secio" }
+libp2p-secio = { path = "../secio", optional = true }
 libp2p-tcp-transport = { path = "../tcp-transport" }
 tokio-core = "0.1"
 
@@ -36,3 +39,29 @@ structopt =  "0.2"
 tokio-core = "0.1"
 tokio-io = "0.1"
 tokio-stdin = "0.1"
+
+[[example]]
+name = "echo-dialer"
+required-features = ["libp2p-secio"]
+
+[[example]]
+name = "echo-server"
+required-features = ["libp2p-secio"]
+
+[[example]]
+name = "floodsub"
+required-features = ["libp2p-secio"]
+
+[[example]]
+name = "kademlia"
+required-features = ["libp2p-secio"]
+
+[[example]]
+name = "ping-client"
+required-features = ["libp2p-secio"]
+
+[[example]]
+name = "random_peerid"
+
+[[example]]
+name = "relay"

libp2p/src/lib.rs

@@ -36,7 +36,7 @@ pub extern crate libp2p_peerstore as peerstore;
 pub extern crate libp2p_ping as ping;
 pub extern crate libp2p_ratelimit as ratelimit;
 pub extern crate libp2p_relay as relay;
-#[cfg(not(target_os = "emscripten"))]
+#[cfg(all(not(target_os = "emscripten"), feature = "libp2p-secio"))]
 pub extern crate libp2p_secio as secio;
 #[cfg(not(target_os = "emscripten"))]
 pub extern crate libp2p_tcp_transport as tcp;