include comparison URL for weights PRs

scripts/ci/gitlab/pipeline/benchmarks.yml

@@ -28,6 +28,7 @@ benchmarks-assets:
     - export CURRENT_TIME=$(date '+%s')
     - export BRANCHNAME="weights-statemint-${CI_COMMIT_BRANCH}-${CURRENT_TIME}"
     - !reference [.git-commit-push, script]
+    - export DESCRIPTION="$(./scripts/weights-pr-description.sh || :)"
     # create PR to release-parachains-v* branch
     - curl -u ${GITHUB_USER}:${GITHUB_TOKEN}
       -d '{"title":"[benchmarks] Update weights for statemine/t","body":"This PR is generated automatically by CI. (Once merged please backport to master and node release branch.)","head":"'${BRANCHNAME}'","base":"'${CI_COMMIT_BRANCH}'"}'

scripts/weights-pr-description.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+
+set -Eeu -o pipefail
+shopt -s inherit_errexit
+
+ORG="paritytech"
+REPO="$CI_PROJECT_NAME"
+
+PR_NUMBER="$CI_COMMIT_REF_NAME"
+if [[ ! "$PR_NUMBER" =~ ^[[:digit:]]+$ ]]; then
+  echo "Not a pull request number: $PR_NUMBER"
+  exit
+fi
+
+BASE_REF="$(curl \
+  -sSL \
+  -H "Authorization: token $GITHUB_TOKEN" \
+  "https://api.github.com/repos/$ORG/$REPO/pulls/$PR_NUMBER" | \
+  jq -e -r ".base.ref")"
+
+WEIGHTS_COMPARISON_URL="$(echo "
+  https://weights.tasty.limo/compare?repo=$CI_PROJECT_NAME&
+  threshold=30&
+  path_pattern=**%2Fweights%2F*.rs&
+  method=guess-worst&
+  ignore_errors=true&
+  unit=time&
+  old=$BASE_REF&
+  new=$BRANCHNAME
+" | tr -d '\n ')"
+
+DESCRIPTION="$(echo -n \
+  $'\n'$'\n'"Compare the weights with \`$BASE_REF\`: $WEIGHTS_COMPARISON_URL" | \
+  jq -sRr @json)"
+
+# remove the quotes around the JSON-encoded string
+echo "${DESCRIPTION:1: -1}"