Try cargo public-api-crates on CI (#1761)

.github/workflows/CI.yml

@@ -74,6 +74,25 @@ jobs:
     - name: cargo hack check
       run: cargo hack check --each-feature --no-dev-deps --all
 
+  cargo-public-api-crates:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        crate: [axum, axum-core, axum-extra, axum-macros]
+    steps:
+    - uses: actions/checkout@master
+    - uses: dtolnay/rust-toolchain@stable
+      with:
+        toolchain: nightly
+        override: true
+        profile: minimal
+    - uses: Swatinem/rust-cache@v1
+    - name: Install cargo-public-api-crates
+      run: |
+        cargo install --git https://github.com/davidpdrsn/cargo-public-api-crates
+    - name: cargo public-api-crates check
+      run: cargo public-api-crates --manifest-path ${{ matrix.crate }}/Cargo.toml check
+
   test-versions:
     needs: check
     runs-on: ubuntu-latest

axum-core/Cargo.toml

@@ -30,3 +30,12 @@ futures-util = "0.3"
 hyper = "0.14"
 tokio = { version = "1.0", features = ["macros"] }
 tower-http = { version = "0.3.4", features = ["limit"] }
+
+[package.metadata.cargo-public-api-crates]
+allowed = [
+    "futures_core",
+    "http",
+    "bytes",
+    "http_body",
+    "tower_layer",
+]

axum-extra/Cargo.toml

@@ -73,3 +73,22 @@ tower-http = { version = "0.3", features = ["map-response-body", "timeout"] }
 [package.metadata.docs.rs]
 all-features = true
 rustdoc-args = ["--cfg", "docsrs"]
+
+[package.metadata.cargo-public-api-crates]
+allowed = [
+    "axum",
+    "axum_core",
+    "bytes",
+    "cookie",
+    "futures_core",
+    "futures_util",
+    "http",
+    "http_body",
+    "hyper",
+    "percent_encoding",
+    "prost",
+    "serde",
+    "tokio",
+    "tower_layer",
+    "tower_service",
+]

axum-macros/Cargo.toml

@@ -37,3 +37,6 @@ serde_json = "1.0"
 syn = { version = "1.0", features = ["full", "extra-traits"] }
 tokio = { version = "1.0", features = ["full"] }
 trybuild = "1.0.63"
+
+[package.metadata.cargo-public-api-crates]
+allowed = []

axum/Cargo.toml

@@ -110,6 +110,23 @@ features = [
     "ws",
 ]
 
+[package.metadata.cargo-public-api-crates]
+allowed = [
+    "axum_core",
+    "bytes",
+    "futures_core",
+    "futures_sink",
+    "futures_util",
+    "headers_core",
+    "http",
+    "http_body",
+    "hyper",
+    "serde",
+    "serde_json",
+    "tower_layer",
+    "tower_service",
+]
+
 [[bench]]
 name = "benches"
 harness = false