Update PR comments #19
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| name: Update PR comments | |
| on: | |
| # This number should correspond to the IGNORE_RUNS_OLDER_THAN value below. | |
| # When setting up for the first time, use "on: push" instead of "on: schedule" | |
| # and set IGNORE_RUNS_OLDER_THAN to a very high number until it runs once. | |
| workflow_run: | |
| workflows: | |
| - Node CI for Boostlet | |
| types: | |
| - completed | |
| jobs: | |
| pr_updater: | |
| runs-on: ubuntu-latest | |
| steps: | |
| - name: main | |
| env: | |
| GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}" | |
| WORKFLOW_NAME: "Node CI for Boostlet" | |
| # the name of the artifact whose content comment published by PR. Must have a single markdown file inside. | |
| MSG_ARTIFACT_NAME: "pr_message" | |
| # How far back to look for finished runs, in minutes. | |
| # Set to 10-20 minutes higher than cron's job frequency set above. | |
| IGNORE_RUNS_OLDER_THAN: 30 | |
| # How far back to look for updated pull requests, in minutes. | |
| # Should be bigger than IGNORE_RUNS_OLDER_THAN by the maximum time a pull request jobs may take | |
| IGNORE_PRS_OLDER_THAN: 80 | |
| run: | | |
| # | |
| # Strategy: | |
| # * get all recently updated pull requests | |
| # * get all recent workflow runs | |
| # * match pull requests and their current SHA with the last workflow run for the same SHA | |
| # * for each found match of <pull-request-number> and <workflow-run-id> : | |
| # * download artifact from the workflow run -- expects a single file with markdown content | |
| # * look through existing PR comments to see if we have posted a comment before | |
| # (uses a hidden magical header to identify our comment) | |
| # * either create or update the comment with the new text (if changed) | |
| # | |
| export GITHUB_API="https://api.github.com/repos/$GITHUB_REPOSITORY" | |
| export COMMENT_MAGIC_HEADER='<!--'" Do not edit. This comment will be auto-updated with artifact '$MSG_ARTIFACT_NAME' created by action '$WORKFLOW_NAME' -->" | |
| # A useful wrapper around CURL | |
| crl() { | |
| curl --silent --show-error --location --retry 1 "${@:2}" \ | |
| -H "Accept: application/vnd.github.antiope-preview+json, application/vnd.github.v3+json" \ | |
| "$1" | |
| } | |
| auth_crl() { | |
| crl "$1" -H "authorization: Bearer $GITHUB_TOKEN" "${@:2}" | |
| } | |
| # | |
| # Parse current pull requests | |
| # | |
| # Get all pull requests, most recently updated first | |
| # (this way we don't need to page through all of them) | |
| # Filter out PRs that are older than $IGNORE_PRS_OLDER_THAN minutes | |
| # Result is an object, mapping a "key" to the pull request number: | |
| # { | |
| # "nyurik/openmaptiles/nyurik-patch-1/4953dd2370b9988a7832d090b5e47b3cd867f594": 6, | |
| # ... | |
| # } | |
| PULL_REQUESTS_RAW="$( crl "$GITHUB_API/pulls?sort=updated&direction=desc" )" | |
| if ! PULL_REQUESTS="$(jq --arg IGNORE_PRS_OLDER_THAN "$IGNORE_PRS_OLDER_THAN" ' | |
| map( | |
| # Only select unlocked pull requests updated within last $IGNORE_PRS_OLDER_THAN minutes | |
| select(.locked==false | |
| and (now - (.updated_at|fromdate)) / 60 < ($IGNORE_PRS_OLDER_THAN | tonumber)) | |
| # Prepare for "from_entries" by creating a key/value object | |
| # The key is a combination of repository name, branch name, and latest SHA | |
| | { key: (.head.repo.full_name + "/" + .head.ref + "/" + .head.sha), value: .number } | |
| ) | |
| | from_entries | |
| ' <( echo "$PULL_REQUESTS_RAW" ) )"; then | |
| echo "Error parsing pull requests" | |
| echo "$PULL_REQUESTS_RAW" | |
| exit 1 | |
| fi | |
| # Count how many pull requests we should process, and exit early if there are none | |
| PR_COUNT="$(jq 'length' <( echo "$PULL_REQUESTS" ) )" | |
| if [ "$PR_COUNT" -eq 0 ]; then | |
| echo "There are no pull requests updated in the last $IGNORE_PRS_OLDER_THAN minutes. Exiting." | |
| exit | |
| else | |
| echo "$PR_COUNT pull requests have been updated in the last $IGNORE_PRS_OLDER_THAN minutes" | |
| echo "$PULL_REQUESTS" | jq -r 'keys|.[]|" * " + .' | |
| fi | |
| # | |
| # Resolve workflow name into workflow ID | |
| # | |
| WORKFLOW_ID="$(crl "$GITHUB_API/actions/workflows" \ | |
| | jq --arg WORKFLOW_NAME "$WORKFLOW_NAME" ' | |
| .workflows[] | select(.name == $WORKFLOW_NAME) | .id | |
| ')" | |
| if [ -z "$WORKFLOW_ID" ]; then | |
| echo "Unable to find workflow '$WORKFLOW_NAME' in $GITHUB_REPOSITORY" | |
| exit 1 | |
| else | |
| echo "Resolved workflow '$WORKFLOW_NAME' to ID $WORKFLOW_ID" | |
| fi | |
| # | |
| # Match pull requests with the workflow runs | |
| # | |
| # Get all workflow runs that were triggered by pull requests | |
| WORKFLOW_PR_RUNS="$(crl "$GITHUB_API/actions/workflows/${WORKFLOW_ID}/runs?event=pull_request")" | |
| # For each workflow run, match it with the pull request to get the PR number | |
| # A match is based on "source repository + branch + SHA" key | |
| # In rare cases (e.g. force push to an older revision), there could be more than one match | |
| # for a given PR number, so just use the most recent one. | |
| # Result is a table (list of lists) - each row with PR number, JOB ID, and the above key | |
| PR_JOB_MAP="$(jq --arg IGNORE_RUNS_OLDER_THAN "$IGNORE_RUNS_OLDER_THAN" ' | |
| # second input is the pull request map - use it to lookup PR numbers | |
| input as $PULL_REQUESTS | |
| | .workflow_runs | |
| | map( | |
| # Create a new object with the relevant values | |
| { | |
| id, | |
| updated_at, | |
| # create lookup key based on source repository + branch + SHA | |
| key: (.head_repository.full_name + "/" + .head_branch + "/" + .head_sha), | |
| # was this a successful run? | |
| # do not include .conclusion=="success" because errors could also post messages | |
| success: (.status=="completed") | |
| } | |
| # lookup PR number from $PULL_REQUESTS using the above key | |
| | . += { pr_number: $PULL_REQUESTS[.key] } | |
| # Remove runs that were not in the list of the PRs | |
| | select(.pr_number) | |
| ) | |
| # Keep just the most recent run per pull request | |
| | group_by(.pr_number) | |
| | map( | |
| sort_by(.updated_at) | |
| | last | |
| # If the most recent run did not succeed, or if the run is too old, ignore it | |
| | select(.success and (now - (.updated_at|fromdate)) / 60 < ($IGNORE_RUNS_OLDER_THAN | tonumber)) | |
| # Keep just the pull request number mapping to run ID | |
| | { pr_number, id, key } | |
| ) | |
| ' <( echo "$WORKFLOW_PR_RUNS" ) <( echo "$PULL_REQUESTS" ) )" | |
| # Count how many jobs we should process, and exit early if there are none | |
| JOBS_COUNT="$(jq 'length' <( echo "$PR_JOB_MAP" ) )" | |
| if [ "$JOBS_COUNT" -eq 0 ]; then | |
| echo "There are no recent workflow job runs in the last $IGNORE_RUNS_OLDER_THAN minutes. Exiting." | |
| exit | |
| else | |
| echo "$JOBS_COUNT '$WORKFLOW_NAME' jobs have been updated in the last $IGNORE_RUNS_OLDER_THAN minutes" | |
| echo "$PR_JOB_MAP" | jq -r '.[] | " * PR #\(.pr_number) Job #\(.id) -- \(.key) "' | |
| fi | |
| # | |
| # Iterate over the found pairs of PR number + run ID, and update them all | |
| # | |
| echo "$PR_JOB_MAP" | jq -r '.[] | [ .pr_number, .id, .key ] | @sh' | \ | |
| while read -r PR_NUMBER RUN_ID RUN_KEY; do | |
| echo "Processing '$WORKFLOW_NAME' run #$RUN_ID for pull request #$PR_NUMBER $RUN_KEY..." | |
| ARTIFACTS="$(crl "$GITHUB_API/actions/runs/$RUN_ID/artifacts")" | |
| # Find the artifact download URL for the artifact with the expected name | |
| ARTIFACT_URL="$(jq -r --arg MSG_ARTIFACT_NAME "$MSG_ARTIFACT_NAME" ' | |
| .artifacts | |
| | map(select(.name == $MSG_ARTIFACT_NAME and .expired == false)) | |
| | first | |
| | .archive_download_url | |
| | select(.!=null) | |
| ' <( echo "$ARTIFACTS" ) )" | |
| if [ -z "$ARTIFACT_URL" ]; then | |
| echo "Unable to find an artifact named '$MSG_ARTIFACT_NAME' in workflow $RUN_ID (PR #$PR_NUMBER), skipping..." | |
| continue | |
| fi | |
| echo "Downloading artifact $ARTIFACT_URL (assuming single text file per artifact)..." | |
| if ! MESSAGE="$(auth_crl "$ARTIFACT_URL" | gunzip)"; then | |
| echo "Unable to download or parse message from artifact '$MSG_ARTIFACT_NAME' in workflow $RUN_ID (PR #$PR_NUMBER), skipping..." | |
| continue | |
| fi | |
| if [ -z "$MESSAGE" ]; then | |
| echo "Empty message in artifact '$MSG_ARTIFACT_NAME' in workflow $RUN_ID (PR #$PR_NUMBER), skipping..." | |
| continue | |
| fi | |
| # Create a message body by appending a magic header | |
| # and stripping any starting and ending whitespace from the original message | |
| MESSAGE_BODY="$(jq -n \ | |
| --arg COMMENT_MAGIC_HEADER "$COMMENT_MAGIC_HEADER" \ | |
| --arg MESSAGE "$MESSAGE" \ | |
| '{ body: ($COMMENT_MAGIC_HEADER + "\n" + ($MESSAGE | sub( "^[\\s\\p{Cc}]+"; "" ) | sub( "[\\s\\p{Cc}]+$"; "" ))) }' \ | |
| )" | |
| EXISTING_PR_COMMENTS="$(crl "$GITHUB_API/issues/$PR_NUMBER/comments")" | |
| # Get the comment URL for the first comment that begins with the magic header, or empty string | |
| OLD_COMMENT="$(jq --arg COMMENT_MAGIC_HEADER "$COMMENT_MAGIC_HEADER" ' | |
| map(select(.body | startswith($COMMENT_MAGIC_HEADER))) | |
| | first | |
| | select(.!=null) | |
| ' <( echo "$EXISTING_PR_COMMENTS" ) )" | |
| if [ -z "$OLD_COMMENT" ]; then | |
| COMMENT_HTML_URL="$(auth_crl "$GITHUB_API/issues/$PR_NUMBER/comments" \ | |
| -X POST \ | |
| -H "Content-Type: application/json" \ | |
| --data "$MESSAGE_BODY" \ | |
| | jq -r '.html_url' )" | |
| COMMENT_INFO="New comment $COMMENT_HTML_URL was created" | |
| else | |
| # Make sure the content of the message has changed | |
| COMMENT_URL="$(jq -r ' | |
| (input | .body) as $body | |
| | select(.body | . != $body) | |
| | .url | |
| ' <( echo "$OLD_COMMENT" ) <( echo "$MESSAGE_BODY" ) )" | |
| if [ -z "$COMMENT_URL" ]; then | |
| echo "The message has already been posted from artifact '$MSG_ARTIFACT_NAME' in workflow $RUN_ID (PR #$PR_NUMBER), skipping..." | |
| continue | |
| fi | |
| COMMENT_HTML_URL="$(auth_crl "$COMMENT_URL" \ | |
| -X PATCH \ | |
| -H "Content-Type: application/json" \ | |
| --data "$MESSAGE_BODY" \ | |
| | jq -r '.html_url' )" | |
| COMMENT_INFO="Existing comment $COMMENT_HTML_URL was updated" | |
| fi | |
| echo "$COMMENT_INFO from workflow $WORKFLOW_NAME #$RUN_ID" | |
| done |