Update PR comments #54455
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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. | |
schedule: | |
- cron: '*/15 * * * *' | |
workflow_dispatch: | |
jobs: | |
pr_updater: | |
runs-on: ubuntu-latest | |
steps: | |
- name: main | |
env: | |
GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}" | |
WORKFLOW_NAME: "Run windup integration tests" | |
# the name of the artifact whose content comment published by PR. Must have a single markdown file inside. | |
MSG_ARTIFACT_NAME: "pr_message" | |
# How far back to look for finished runs, in minutes. | |
# Set to 10-20 minutes higher than cron's job frequency set above. | |
IGNORE_RUNS_OLDER_THAN: 150 | |
# How far back to look for updated pull requests, in minutes. | |
# Should be bigger than IGNORE_RUNS_OLDER_THAN by the maximum time a pull request jobs may take | |
IGNORE_PRS_OLDER_THAN: 150 | |
run: | | |
# | |
# Strategy: | |
# * get all recently updated pull requests | |
# * get all recent workflow runs | |
# * match pull requests and their current SHA with the last workflow run for the same SHA | |
# * for each found match of <pull-request-number> and <workflow-run-id> : | |
# * download artifact from the workflow run -- expects a single file with markdown content | |
# * look through existing PR comments to see if we have posted a comment before | |
# (uses a hidden magical header to identify our comment) | |
# * either create or update the comment with the new text (if changed) | |
# | |
export GITHUB_API="https://api.github.com/repos/$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 |