hide event engine implementation behind the feature flag (#146)

Author: Xavrax

Cargo.toml

@@ -61,10 +61,13 @@ extra_platforms = ["spin/portable_atomic", "dep:portable-atomic"]
 
 # [Internal features] (not intended for use outside of the library)
 contract_test = ["parse_token", "publish", "access"]
-full_no_std = ["serde", "reqwest", "aescbc", "parse_token", "blocking", "publish", "access"]
-full_no_std_platform_independent = ["serde", "aescbc", "parse_token", "blocking", "publish", "access"]
-pubnub_only = ["aescbc", "parse_token", "blocking", "publish", "access"]
+full_no_std = ["serde", "reqwest", "aescbc", "parse_token", "blocking", "publish", "access", "subscribe"]
+full_no_std_platform_independent = ["serde", "aescbc", "parse_token", "blocking", "publish", "access", "subscribe"]
+pubnub_only = ["aescbc", "parse_token", "blocking", "publish", "access", "subscribe"]
 mock_getrandom = ["getrandom/custom"]
+event_engine = []
+# TODO: temporary treated as internal until we officially release it
+subscribe = ["event_engine"]
 
 [dependencies]
 async-trait = "0.1"

src/core/mod.rs

@@ -58,5 +58,7 @@ pub mod serializer;
 pub use cryptor::Cryptor;
 pub mod cryptor;
 
+#[cfg(feature = "event_engine")]
 pub(crate) mod event_engine;
+
 pub(crate) mod metadata;

src/dx/mod.rs

@@ -12,6 +12,7 @@ pub mod access;
 #[cfg(feature = "publish")]
 pub mod publish;
 
+#[cfg(feature = "subscribe")]
 pub mod subscribe;
 
 #[cfg(all(feature = "parse_token", feature = "serde"))]