WIP

Signed-off-by: Francesco Guardiani <francescoguard@gmail.com>

.github/workflows/rust_tests.yml

@@ -53,36 +53,20 @@ jobs:
 
     # If glibc, compile and test all
     - uses: actions-rs/cargo@v1
-      name: "Build"
+      name: "Build glibc"
       if: matrix.target == 'x86_64-unknown-linux-gnu'
       with:
         command: build
         toolchain: ${{ matrix.toolchain }}
         args: --target ${{ matrix.target }} --all-features
     - uses: actions-rs/cargo@v1
-      name: "Test"
+      name: "Test glibc"
       if: matrix.target == 'x86_64-unknown-linux-gnu'
       with:
         command: test
         toolchain: ${{ matrix.toolchain }}
         args: --target ${{ matrix.target }} --all-features
 
-    # If glibc, compile and test only the core module with no_std
-    - uses: actions-rs/cargo@v1
-      name: "Build"
-      if: matrix.target == 'x86_64-unknown-linux-gnu'
-      with:
-        command: build
-        toolchain: ${{ matrix.toolchain }}
-        args: --target ${{ matrix.target }} --package cloudevents-sdk --workspace --no-default-features
-    - uses: actions-rs/cargo@v1
-      name: "Test"
-      if: matrix.target == 'x86_64-unknown-linux-gnu'
-      with:
-        command: test
-        toolchain: ${{ matrix.toolchain }}
-        args: --target ${{ matrix.target }} --package cloudevents-sdk --workspace --no-default-features
-
     # If musl, compile and test all
     - uses: actions-rs/cargo@v1
       name: "Build"
@@ -145,3 +129,31 @@ jobs:
         command: build
         toolchain: ${{ matrix.toolchain }}
         args: --target ${{ matrix.target }} --manifest-path ./example-projects/warp-example/Cargo.toml
+
+  check_no_std:
+    name: Check no_std
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          override: true
+      # Caching stuff
+      - uses: actions/cache@v2
+        with:
+          path: |
+            ~/.cargo/bin/
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+          key: ${{ runner.os }}-cargo-no-std-deps-${{ hashFiles('**/Cargo.toml') }}
+      - uses: actions/cache@v2
+        with:
+          path: |
+            target/
+          key: ${{ runner.os }}-cargo-no-std-build-${{ hashFiles('**/Cargo.toml') }}
+      - name: Download cargo-nono
+        run: curl -LSfs https://japaric.github.io/trust/install.sh | sh -s -- --git hobofan/cargo-nono
+      - name: Run check
+        run: ./cargo-nono check

Cargo.toml

@@ -17,6 +17,11 @@ categories = ["web-programming", "encoding", "data-structures", "no_std"]
 name = "cloudevents"
 
 [features]
+# Without default features, the package acts as no_std
+default = ["std"]
+
+std = ["snafu/std", "url"]
+
 actix = ["actix-web", "async-trait", "lazy_static", "bytes", "futures"]
 reqwest = ["reqwest-lib", "async-trait", "lazy_static", "bytes"]
 rdkafka = ["rdkafka-lib", "lazy_static", "bytes", "futures"]
@@ -28,16 +33,10 @@ serde_json = "^1.0"
 chrono = { version = "^0.4", features = ["serde"] }
 delegate-attr = "^0.2"
 base64 = "^0.12"
-snafu = { version = "^0.6", default-features = false}
+snafu = { version = "^0.6", default-features = false }
 bitflags = "^1.2"
 url = { version = "^2.1", features = ["serde"], optional = true }
 
-[features]
-# Without default features, the package acts as no_std
-default = ["std"]
-
-std = ["snafu/std", "url"]
-
 # runtime optional deps
 actix-web = { version = "^3", default-features = false, optional = true }
 reqwest-lib = { version = "^0.11", default-features = false, features = ["rustls-tls"], optional = true, package = "reqwest" }

example-projects/no-std-example/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "no-std-example"
+version = "0.1.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+cloudevents-sdk = { path = "../..", default-features = false }
+
+[profile.dev]
+panic = "abort"
+
+[profile.release]
+panic = "abort"

example-projects/no-std-example/src/main.rs

@@ -0,0 +1,25 @@
+#![no_std]
+#![no_main]
+
+use core::panic::PanicInfo;
+
+use cloudevents;
+use cloudevents::EventBuilder;
+
+#[panic_handler]
+fn panic(_info: &PanicInfo) -> ! {
+    loop {}
+}
+
+#[no_mangle]
+pub extern "C" fn _start() -> ! {
+    loop {
+        #[allow(dead_code)]
+        let event = cloudevents::EventBuilderV10::new()
+            .id("my_id")
+            .source("my_source")
+            .subject("some_subject")
+            .build()
+            .unwrap();
+    }
+}

src/lib.rs

@@ -53,6 +53,7 @@
 //! [Responders]: https://actix.rs/docs/handlers/
 
 #![deny(broken_intra_doc_links)]
+
 #![cfg_attr(not(any(feature = "std", test)), no_std)]
 
 #[cfg(feature = "alloc")]
@@ -62,7 +63,9 @@ extern crate std as alloc;
 #[cfg(any(feature = "std", test))]
 extern crate std as core;
 
+#[cfg(feature = "std")]
 pub mod binding;
+
 pub mod event;
 pub mod message;