chore: add watchdog canister metadata

.github/workflows/workflow.yml

@@ -605,6 +605,34 @@ jobs:
         run: |
           bash watchdog/e2e-tests/upgradability.sh
 
+  watchdog_canister_metadata:
+    runs-on: ubuntu-20.04
+    needs: cargo-build
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            target
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}-1
+
+      - name: Install Rust
+        run: |
+          rustup update ${{ matrix.rust }} --no-self-update
+          rustup default ${{ matrix.rust }}
+          rustup target add wasm32-unknown-unknown
+
+      - name: Install dfx
+        uses: dfinity/setup-dfx@main
+        with:
+          dfx-version: $DFX_VERSION
+
+      - name: Run watchdog_canister_metadata test
+        run: bash watchdog/e2e-tests/watchdog-canister-metadata.sh
+
   canister-build-reproducibility:
     runs-on: ubuntu-20.04
 

scripts/build-canister.sh

@@ -39,10 +39,17 @@ if [[ "$STATUS" -eq "0" ]]; then
     -o "./target/$TARGET/release/$CANISTER.wasm" shrink
 
     if [[ "$CANISTER" == "ic-btc-canister" ]]; then
-    	./target/bin/ic-wasm \
-    	"./target/$TARGET/release/$CANISTER.wasm" \
-    	-o "./target/$TARGET/release/$CANISTER.wasm" \
-    	metadata candid:service -f "$SCRIPT_DIR/../canister/candid.did" -v public
+      ./target/bin/ic-wasm \
+      "./target/$TARGET/release/$CANISTER.wasm" \
+      -o "./target/$TARGET/release/$CANISTER.wasm" \
+      metadata candid:service -f "$SCRIPT_DIR/../canister/candid.did" -v public
+    fi
+
+    if [[ "$CANISTER" == "watchdog" ]]; then
+      ./target/bin/ic-wasm \
+      "./target/$TARGET/release/$CANISTER.wasm" \
+      -o "./target/$TARGET/release/$CANISTER.wasm" \
+      metadata candid:service -f "$SCRIPT_DIR/../watchdog/candid.did" -v public
     fi
 
   true

watchdog/Cargo.toml

@@ -28,3 +28,4 @@ ic-btc-interface = { workspace = true }
 [dev-dependencies]
 tokio = { workspace = true }
 assert-json-diff = "2.0.2"
+candid_parser = { workspace = true }

watchdog/e2e-tests/watchdog-canister-metadata.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+set -Eexuo pipefail
+
+SCRIPT_DIR="$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"
+source "${SCRIPT_DIR}/utils.sh"
+
+# Run dfx stop if we run into errors.
+trap "dfx stop" EXIT SIGINT
+
+dfx start --background --clean
+
+# Deploy the watchdog canister.
+deploy_watchdog_canister_mainnet
+
+# Check the canister's metadata section for the Candid interface.
+METADATA=$(dfx canister metadata watchdog candid:service)
+
+# Metadata returned should match the canister's .did file.
+DIFF_OUTPUT=$(diff "$SCRIPT_DIR/../candid.did" <(echo "$METADATA"))
+
+if [ "$DIFF_OUTPUT" != "" ]; then
+  echo "FAIL"
+  exit 1
+fi
+
+echo "SUCCESS"

watchdog/src/lib.rs

@@ -198,4 +198,22 @@ mod test {
         init(BitcoinNetwork::Mainnet);
         assert_eq!(get_config(), Config::mainnet());
     }
+
+    #[test]
+    fn test_candid_interface_compatibility() {
+        use candid_parser::utils::{service_compatible, CandidSource};
+        use std::path::PathBuf;
+
+        candid::export_service!();
+        let rust_interface = __export_service();
+
+        let candid_interface =
+            PathBuf::from(std::env::var("CARGO_MANIFEST_DIR").unwrap()).join("candid.did");
+
+        service_compatible(
+            CandidSource::Text(&rust_interface),
+            CandidSource::File(candid_interface.as_path()),
+        )
+        .expect("The canister implementation is not compatible with the candid.did file");
+    }
 }