Document and enforce MSRV in CI

Author: tnull

.github/workflows/build.yml

@@ -6,10 +6,17 @@ jobs:
   build:
     strategy:
       matrix:
-        toolchain: [ stable, beta ]
+        toolchain: [
+          stable,
+          beta,
+          1.60.0, # Our MSRV
+      ]
         include:
           - toolchain: stable
             check-fmt: true
+            build-uniffi: true
+          - toolchain: 1.60.0
+            msrv: true
     runs-on: ubuntu-latest
     steps:
       - name: Checkout source code
@@ -20,9 +27,13 @@ jobs:
           toolchain: ${{ matrix.toolchain }}
           override: true
           profile: minimal
+      - name: Pin packages to allow for MSRV
+        if: matrix.msrv
+        run: cargo update -p hashlink --precise "0.8.1" --verbose # hashlink 0.8.2 requires hashbrown 0.13, requiring 1.61.0
       - name: Build on Rust ${{ matrix.toolchain }}
         run: cargo build --verbose --color always
       - name: Build with UniFFI support on Rust ${{ matrix.toolchain }}
+        if: matrix.build-uniffi
         run: cargo build --features uniffi --verbose --color always
       - name: Build documentation on Rust ${{ matrix.toolchain }}
         run: |
@@ -31,10 +42,12 @@ jobs:
       - name: Check release build on Rust ${{ matrix.toolchain }}
         run: cargo check --release --verbose --color always
       - name: Check release build with UniFFI support on Rust ${{ matrix.toolchain }}
+        if: matrix.build-uniffi
         run: cargo check --release --features uniffi --verbose --color always
       - name: Test on Rust ${{ matrix.toolchain }}
         run: cargo test
       - name: Test with UniFFI support on Rust ${{ matrix.toolchain }}
+        if: matrix.build-uniffi
         run: cargo test --features uniffi
       - name: Check formatting on Rust ${{ matrix.toolchain }}
         if: matrix.check-fmt

README.md

@@ -59,6 +59,9 @@ LDK Node currently comes with a decidedly opinionated set of design choices:
 ## Language Support
 LDK Node itself is written in [Rust][rust] and may therefore be natively added as a library dependency to any `std` Rust program. However, beyond its Rust API it also offers language bindings for [Swift][swift], [Kotlin][kotlin], and [Python][python] based on the [UniFFI](https://github.com/mozilla/uniffi-rs/). Moreover, [Flutter bindings][flutter_bindings] are also available.
 
+## MSRV
+The Minimum Supported Rust Version (MSRV) is currently 1.60.0.
+
 [api_docs]: https://docs.rs/ldk-node/*/ldk_node/
 [api_docs_node]: https://docs.rs/ldk-node/*/ldk_node/struct.Node.html
 [api_docs_builder]: https://docs.rs/ldk-node/*/ldk_node/struct.Builder.html