ci: Run substream checks only on changed substream modules (#200)

* ci: run substream checks only on changed substream modules

* ci: move substream package extraction code to a composite action

.github/actions/substreams-check/action.yml

@@ -0,0 +1,47 @@
+name: 'Substreams Package Names'
+description: 'Compute package names from changed files'
+
+inputs:
+  changed-files:
+    description: 'List of changed files from tj-actions/changed-files'
+    required: true
+
+outputs:
+  package_names:
+    description: 'Space-separated list of package names that were found'
+    value: ${{ steps.extract_package_names.outputs.package_names }}
+
+runs:
+  using: "composite"
+  steps:
+    - name: Get changed directories and package names
+      id: extract_package_names
+      shell: bash
+      run: |
+        # Convert space-separated list to newline-separated list and process
+        echo '${{ inputs.changed-files }}' | tr ' ' '\n' | grep '^substreams/' | grep -v 'Cargo.lock$' > changed_files.txt
+        
+        # Extract unique directory paths
+        CHANGED_DIRS=$(cat changed_files.txt | cut -d'/' -f1-2 | sort -u)
+        
+        # Initialize empty array for package names
+        PACKAGE_NAMES=()
+        
+        # Loop through directories and find package names
+        while IFS= read -r dir; do
+          if [ -f "$dir/Cargo.toml" ]; then
+            PACKAGE_NAME=$(grep -m1 '^name = ' "$dir/Cargo.toml" | cut -d'"' -f2)
+            if [ -n "$PACKAGE_NAME" ]; then
+              PACKAGE_NAMES+=("$PACKAGE_NAME")
+            fi
+          fi
+        done <<< "$CHANGED_DIRS"
+        
+        # Join package names with spaces and store
+        if [ ${#PACKAGE_NAMES[@]} -gt 0 ]; then
+          echo "package_names=${PACKAGE_NAMES[*]}" >> $GITHUB_OUTPUT
+          echo "Found packages: ${PACKAGE_NAMES[*]}"
+        else
+          echo "No valid packages found"
+          echo "package_names=" >> $GITHUB_OUTPUT
+        fi 

.github/workflows/substream.ci.yaml

@@ -1,9 +1,7 @@
 name: Substreams CI
 
 on:
-  push:
-    paths:
-      - "substreams/**"
+  pull_request:
 
 jobs:
   lint:
@@ -15,22 +13,50 @@ jobs:
         with:
           submodules: recursive
 
+      - name: Check if any Substreams files changed
+        id: substreams-files-changed
+        uses: tj-actions/changed-files@v35
+        with:
+          files: substreams/**
+
       - name: Setup toolchain
+        if: steps.substreams-files-changed.outputs.any_changed == 'true'
         uses: dtolnay/rust-toolchain@v1
         with:
           toolchain: nightly
           components: clippy, rustfmt
 
       - name: Setup Rust Cache
+        if: steps.substreams-files-changed.outputs.any_changed == 'true'
         uses: Swatinem/rust-cache@v2
         with:
           cache-on-failure: true
 
+      - name: Get changed Substreams package names
+        if: steps.substreams-files-changed.outputs.any_changed == 'true'
+        id: changed_packages
+        uses: ./.github/actions/substreams-check
+        with:
+          changed-files: ${{ steps.substreams-files-changed.outputs.all_changed_files }}
+
       - name: Run checks
+        if: steps.substreams-files-changed.outputs.any_changed == 'true'
+        shell: bash
         run: |
           cd substreams
-          cargo +nightly-2025-03-01 fmt -- --check
-          cargo +nightly-2025-03-01 clippy --all --all-features --all-targets -- -D warnings
+          if [ -n "${{ steps.changed_packages.outputs.package_names }}" ]; then
+            for package in ${{ steps.changed_packages.outputs.package_names }}; do
+              echo "Running checks for package: $package"
+              cargo +nightly fmt --package "$package" -- --check
+              cargo +nightly clippy --package "$package" -- -D warnings
+            done
+          else
+            echo "No packages to check"
+          fi
+
+      - name: Skip check
+        if: steps.substreams-files-changed.outputs.any_changed != 'true'
+        run: echo "No changes to substreams directory, skipping lint check"
 
   test:
     name: Substreams Test
@@ -41,19 +67,47 @@ jobs:
         with:
           submodules: recursive
 
+      - name: Check if any Substreams files changed
+        id: substreams-files-changed
+        uses: tj-actions/changed-files@v35
+        with:
+          files: substreams/**
+
       - name: Setup toolchain
+        if: steps.substreams-files-changed.outputs.any_changed == 'true'
         uses: dtolnay/rust-toolchain@v1
         with:
           toolchain: stable
           targets: wasm32-unknown-unknown
 
       - name: Setup Rust Cache
+        if: steps.substreams-files-changed.outputs.any_changed == 'true'
         uses: Swatinem/rust-cache@v2
         with:
           cache-on-failure: true
 
+      - name: Get changed Substreams package names
+        if: steps.substreams-files-changed.outputs.any_changed == 'true'
+        id: changed_packages
+        uses: ./.github/actions/substreams-check
+        with:
+          changed-files: ${{ steps.substreams-files-changed.outputs.all_changed_files }}
+
       - name: Run checks
+        if: steps.substreams-files-changed.outputs.any_changed == 'true'
+        shell: bash
         run: |
           cd substreams
-          cargo build --target wasm32-unknown-unknown --all-targets --all-features
-          cargo test --workspace --all-targets --all-features
+          if [ -n "${{ steps.changed_packages.outputs.package_names }}" ]; then
+            for package in ${{ steps.changed_packages.outputs.package_names }}; do
+              echo "Running checks for package: $package"
+              cargo build --package "$package" --target wasm32-unknown-unknown
+              cargo test --package "$package"
+            done
+          else
+            echo "No packages to check"
+          fi
+
+      - name: Skip check
+        if: steps.substreams-files-changed.outputs.any_changed != 'true'
+        run: echo "No changes to substreams directory, skipping test check"