Add benchmark result to GitHub PR (#2123)

* Add benchmark result to GitHub PR
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Post benchmark to comments
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Test Stuff
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Update using jq.
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Update
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

.benchmark.sh

+#!/usr/bin/env bash
+
+set -e +o pipefail
+
+if [ "$TRAVIS_PULL_REQUEST" != "false" ] ; then
+    echo -e "NOTE: The CPU benchmarks are performed on Travis VMs and vary widly between runs," > .benchmark.body
+    echo -e " you can't trust them. The memory benchmarks are OK\n\n" >> .benchmark.body
+    cat .benchmark.log >> .benchmark.body
+    jq -n --arg body "$(cat .benchmark.body)" '{body: $body}' > .benchmark.json
+    curl -H "Authorization: token ${GITHUB_TOKEN}" -X POST \
+        --data-binary "@.benchmark.json" \
+        "https://api.github.com/repos/${TRAVIS_REPO_SLUG}/issues/${TRAVIS_PULL_REQUEST}/comments"
+fi

.travis.yml

@@ -46,3 +46,4 @@ script:
 
 after_success:
   - bash <(curl -s https://codecov.io/bash)
+  - bash .benchmark.sh

Makefile

@@ -72,7 +72,7 @@ ifeq ($(TEST_TYPE),benchmark)
 	( cd request; go test -run=NONE -bench=. -benchmem=true -tags 'etcd' ./... ) >> old
 	( cd core; go test -run=NONE -bench=. -benchmem=true -tags 'etcd' ./... ) >> old
 	( cd coremain; go test -run=NONE -bench=. -benchmem=true -tags 'etcd' ./... ) >> old
-	if command -v benchcmp; then benchcmp old new ; fi
+	if command -v benchcmp; then benchcmp old new > .benchmark.log ; cat .benchmark.log ; fi
 	git checkout -
 endif