ci: Reproduce Esplora 0.0.0.0 connection failure on macOS

Force Esplora chain source and run on macOS to reproduce the fee rate
estimation failure caused by electrsd exposing 0.0.0.0 as the Esplora
URL. On macOS, connecting to 0.0.0.0 as a destination address results
in ConnectionRefused.

AI tools were used in preparing this commit.

Author: joostjager

.github/workflows/rust.yml

@@ -8,42 +8,13 @@ concurrency:
 
 jobs:
   build:
-    strategy:
-      matrix:
-        platform: [
-          ubuntu-latest,
-          macos-latest,
-          windows-latest,
-          ]
-        toolchain: [
-          stable,
-          beta,
-          1.85.0, # Our MSRV
-          ]
-        include:
-          - toolchain: stable
-            check-fmt: true
-            build-uniffi: true
-            platform: ubuntu-latest
-          - toolchain: stable
-            platform: macos-latest
-          - toolchain: stable
-            platform: windows-latest
-          - toolchain: 1.85.0
-            msrv: true
-    runs-on: ${{ matrix.platform }}
+    runs-on: macos-latest
     steps:
       - name: Checkout source code
         uses: actions/checkout@v3
-      - name: Install Rust ${{ matrix.toolchain }} toolchain
+      - name: Install Rust stable toolchain
         run: |
-          curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --profile=minimal --default-toolchain ${{ matrix.toolchain }}
-      - name: Check formatting on Rust ${{ matrix.toolchain }}
-        if: matrix.check-fmt
-        run: rustup component add rustfmt && cargo fmt --all -- --check
-      - name: Set RUSTFLAGS to deny warnings
-        if: "matrix.toolchain == 'stable'"
-        run: echo "RUSTFLAGS=-D warnings" >> "$GITHUB_ENV"
+          curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --profile=minimal --default-toolchain stable
       - name: Enable caching for bitcoind
         id: cache-bitcoind
         uses: actions/cache@v4
@@ -57,7 +28,7 @@ jobs:
           path: bin/electrs-${{ runner.os }}-${{ runner.arch }}
           key: electrs-${{ runner.os }}-${{ runner.arch }}
       - name: Download bitcoind/electrs
-        if: "matrix.platform != 'windows-latest' && (steps.cache-bitcoind.outputs.cache-hit != 'true' || steps.cache-electrs.outputs.cache-hit != 'true')"
+        if: "steps.cache-bitcoind.outputs.cache-hit != 'true' || steps.cache-electrs.outputs.cache-hit != 'true'"
         run: |
           source ./scripts/download_bitcoind_electrs.sh
           mkdir bin
@@ -67,32 +38,8 @@ jobs:
         run: |
           echo "BITCOIND_EXE=$( pwd )/bin/bitcoind-${{ runner.os }}-${{ runner.arch }}" >> "$GITHUB_ENV"
           echo "ELECTRS_EXE=$( pwd )/bin/electrs-${{ runner.os }}-${{ runner.arch }}" >> "$GITHUB_ENV"
-      - name: Build on Rust ${{ matrix.toolchain }}
+      - name: Build
         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: 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 }}
-        if: "matrix.platform != 'windows-latest'"
+      - name: Reproduce Esplora 0.0.0.0 connection issue (temporary)
         run: |
-          RUSTFLAGS="--cfg no_download --cfg cycle_tests" cargo test
-      - name: Test with UniFFI support on Rust ${{ matrix.toolchain }}
-        if: "matrix.platform != 'windows-latest' && matrix.build-uniffi"
-        run: |
-          RUSTFLAGS="--cfg no_download --cfg cycle_tests" cargo test --features uniffi
-
-  doc:
-    name: Documentation
-    runs-on: ubuntu-latest
-    env:
-      RUSTDOCFLAGS: -Dwarnings
-    steps:
-      - uses: actions/checkout@v6
-      - uses: dtolnay/rust-toolchain@nightly
-      - uses: dtolnay/install@cargo-docs-rs
-      - run: cargo docs-rs
+          RUSTFLAGS="--cfg no_download --cfg cycle_tests" cargo test --test integration_tests_rust

tests/common/mod.rs

@@ -236,28 +236,10 @@ pub(crate) fn setup_bitcoind_and_electrsd() -> (BitcoinD, ElectrsD) {
 }
 
 pub(crate) fn random_chain_source<'a>(
-	bitcoind: &'a BitcoinD, electrsd: &'a ElectrsD,
+	_bitcoind: &'a BitcoinD, electrsd: &'a ElectrsD,
 ) -> TestChainSource<'a> {
-	let r = rand::random_range(0..3);
-	match r {
-		0 => {
-			println!("Randomly setting up Esplora chain syncing...");
-			TestChainSource::Esplora(electrsd)
-		},
-		1 => {
-			println!("Randomly setting up Electrum chain syncing...");
-			TestChainSource::Electrum(electrsd)
-		},
-		2 => {
-			println!("Randomly setting up Bitcoind RPC chain syncing...");
-			TestChainSource::BitcoindRpcSync(bitcoind)
-		},
-		3 => {
-			println!("Randomly setting up Bitcoind REST chain syncing...");
-			TestChainSource::BitcoindRestSync(bitcoind)
-		},
-		_ => unreachable!(),
-	}
+	println!("Forcing Esplora chain syncing to reproduce 0.0.0.0 connection issue...");
+	TestChainSource::Esplora(electrsd)
 }
 
 pub(crate) fn random_storage_path() -> PathBuf {