Enable caching for bitcoind/electrs in CI

Author: tnull

.github/workflows/build.yml

@@ -41,6 +41,27 @@ jobs:
       - name: Set RUSTFLAGS to deny warnings
         if: "matrix.toolchain == '1.63.0'"
         run: echo "RUSTFLAGS=-D warnings" >> "$GITHUB_ENV"
+      - name: Enable caching for bitcoind
+        id: cache-bitcoind
+        uses: actions/cache@v4
+        with:
+          path: $HOME/bin
+          key: bitcoind
+      - name: Enable caching for electrs
+        id: cache-electrs
+        uses: actions/cache@v4
+        with:
+          path: $HOME/bin
+          key: electrs
+      - name: Download bitcoind/electrs and set environment variables
+        if: "matrix.platform != 'windows-latest' && (steps.cache-bitcoind.outputs.cache-hit != 'true' || steps.cache-electrs.outputs.cache-hit != 'true')"
+        run: |
+            source ./contrib/download_bitcoind_electrs.sh
+            mkdir -p "$HOME"/bin
+            mv "$BITCOIND_EXE" "$HOME"/bin/bitcoind
+            mv "$ELECTRS_EXE" "$HOME"/bin/electrs
+            echo "BITCOIND_EXE=$HOME/bin/bitcoind" >> "$GITHUB_ENV"
+            echo "ELECTRS_EXE=$HOME/bin/electrs" >> "$GITHUB_ENV"
       - name: Run CI script
         shell: bash # Default on Winblows is powershell
         run: CI_MINIMIZE_DISK_USAGE=1 ./ci/ci-tests.sh

ci/ci-tests.sh

@@ -3,7 +3,6 @@ set -eox pipefail
 
 RUSTC_MINOR_VERSION=$(rustc --version | awk '{ split($2,a,"."); print a[2] }')
 HOST_PLATFORM="$(rustc --version --verbose | grep "host:" | awk '{ print $2 }')"
-CONTRIB_DIR=$(cd "$( dirname "${BASH_SOURCE[0]}" )/../contrib" && pwd )
 
 # Some crates require pinning to meet our MSRV even for our downstream users,
 # which we do here.
@@ -45,20 +44,22 @@ cargo check --verbose --color always --features rpc-client,rest-client,tokio
 popd
 
 if [[ "$HOST_PLATFORM" != *windows* ]]; then
-	echo -e "\n\nBuilding and testing Transaction Sync Clients with features"
-	pushd lightning-transaction-sync
-
-	source "$CONTRIB_DIR/download_bitcoind_electrs.sh"
-
-	cargo test --verbose --color always --features esplora-blocking
-	cargo check --verbose --color always --features esplora-blocking
-	cargo test --verbose --color always --features esplora-async
-	cargo check --verbose --color always --features esplora-async
-	cargo test --verbose --color always --features esplora-async-https
-	cargo check --verbose --color always --features esplora-async-https
-	cargo test --verbose --color always --features electrum
-	cargo check --verbose --color always --features electrum
-	popd
+	if [ -z "$BITCOIND_EXE" ] || [ -z "$ELECTRS_EXE" ]; then
+		echo -e "\n\nSkipping testing Transaction Sync Clients due to BITCOIND_EXE or ELECTRS_EXE being unset."
+	else
+		echo -e "\n\nBuilding and testing Transaction Sync Clients with features"
+		pushd lightning-transaction-sync
+
+		cargo test --verbose --color always --features esplora-blocking
+		cargo check --verbose --color always --features esplora-blocking
+		cargo test --verbose --color always --features esplora-async
+		cargo check --verbose --color always --features esplora-async
+		cargo test --verbose --color always --features esplora-async-https
+		cargo check --verbose --color always --features esplora-async-https
+		cargo test --verbose --color always --features electrum
+		cargo check --verbose --color always --features electrum
+		popd
+	fi
 fi
 
 echo -e "\n\nTest futures builds"