From e7a50e0a41a1b150d8dd0e92e63e7d8ad7cd9663 Mon Sep 17 00:00:00 2001
From: Alexandr Yepishev <alexandr.yepishev@smartcontract.com>
Date: Mon, 9 Dec 2024 20:30:08 +0000
Subject: [PATCH] Map affected files to modules

---
 .../scripts/map-affected-files-to-modules.sh  | 41 +++++++++++++++++++
 .github/workflows/ci-core.yml                 | 27 ++++++++++--
 2 files changed, 64 insertions(+), 4 deletions(-)
 create mode 100755 .github/scripts/map-affected-files-to-modules.sh

diff --git a/.github/scripts/map-affected-files-to-modules.sh b/.github/scripts/map-affected-files-to-modules.sh
new file mode 100755
index 00000000000..38204c2bbb4
--- /dev/null
+++ b/.github/scripts/map-affected-files-to-modules.sh
@@ -0,0 +1,41 @@
+#!/bin/bash
+set -e
+
+# Get the list of changed files from the JSON payload
+changed_files=$(echo "$1" | jq -r '.[]')
+echo "Changed files: ${changed_files[@]}"
+
+# Find all modules in the repository, strip the leading './' and remove duplicates
+modules=$(find . -name 'go.mod' -exec dirname {} \; | sed 's|^./||' | uniq)
+echo "Found modules: ${modules[@]}"
+
+# An associative array to track unique modules (since bash v4)
+declare -A unique_modules
+
+# Loop through each changed file and determine its module
+for path_to_file in $changed_files; do
+	echo "Resolving a module affected by a file: '$path_to_file'"
+  for module in $modules; do
+    echo "Checking against module: '$module'"
+    if [[ ! $path_to_file =~ \/ ]]; then # if no slash in the path it is the root (i.e. main.go vs .gitignore)
+      echo "File '$path_to_file' is a file in the root."
+      unique_modules["."]="."
+      break
+    # skip adding a dot to the affected_modules
+    # if the path to a file matches the path to a module, 
+    # add it to affected_modules
+    elif [[ $module != "." && $path_to_file =~ ^$module* ]]; then
+      echo "File '$path_to_file' is in the module '$module'"
+      unique_modules["$module"]="$module"
+      break
+    fi
+	done
+done
+
+# Convert associative array keys to an indexed array
+affected_modules=("${!unique_modules[@]}")
+echo "Affected modules: ${affected_modules[@]}"
+
+# Convert the array to a JSON array
+json_array=$(printf '%s\n' "${affected_modules[@]}" | jq -R . | jq -s . | jq -c)
+echo "module_names=$json_array" >> $GITHUB_OUTPUT
diff --git a/.github/workflows/ci-core.yml b/.github/workflows/ci-core.yml
index 6ce992240da..1ba20be1ebe 100644
--- a/.github/workflows/ci-core.yml
+++ b/.github/workflows/ci-core.yml
@@ -33,7 +33,7 @@ jobs:
     permissions:
       pull-requests: read
     outputs:
-      affected-packages: ${{ steps.match-every.outputs.non-ignored_files }}
+      affected-packages: ${{ toJson(steps.resolved-modules.outputs.module_names) }}
       deployment-changes: ${{ steps.match-some.outputs.deployment == 'true' }}
       should-run-ci-core: ${{ steps.match-some.outputs.core-ci == 'true' || steps.match-every.outputs.non-ignored == 'true' ||  github.event_name == 'workflow_dispatch' || github.event_name == 'schedule' }}
       should-run-golangci: ${{ steps.match-some.outputs.golang-ci == 'true' || steps.match-every.outputs.non-ignored == 'true' || github.event_name == 'workflow_dispatch' }}
@@ -96,14 +96,33 @@ jobs:
               - '!nix-darwin-shell-hook.sh'
               - '!LICENSE'
               - '!.github/**'
-      - name: TEST
-        run: echo "${{ steps.match-every.outputs.non-ignored_files }}"
+
+      - name: Resolve affected files to modules
+        if: ${{ steps.match-every.outputs.non-ignored == 'true' }}
+        id: resolved-modules
+        shell: bash
+        run: |
+          bash ./.github/scripts/map-affected-files-to-modules.sh '${{ steps.match-every.outputs.non-ignored_files }}'
   
+  test-filter:
+    name: Test Filter
+    needs: [filter]
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4.2.1
+      - name: Test Filter 1
+        shell: bash
+        run: echo "${{ needs.filter.outputs.affected-packages }}"
+      - name: Test Filter 2
+        shell: bash
+        run: echo "${{ fromJson(needs.filter.outputs.affected-packages) }}"
+
   golangci:
     name: lint
+    needs: [filter, run-frequency]
     # We don't directly merge dependabot PRs, so let's not waste the resources.
     if: ${{ (github.event_name == 'pull_request' ||  github.event_name == 'schedule') && github.actor != 'dependabot[bot]' && needs.filter.outputs.should-run-golangci == 'true' }}
-    needs: [filter, run-frequency]
     permissions:
       # To annotate code in the PR.
       checks: write