Add exporter GRANT to integration tests

Add a test of the GRANT statement to the exporter integration test.

Fixes: #622

Signed-off-by: SuperQ <[email protected]>

Author: SuperQ

Diff for: .circleci/config.yml

@@ -18,11 +18,12 @@ jobs:
           file: mysqld_exporter
   integration:
     docker:
-      - image: circleci/golang:1.17
+      - image: cimg/go:1.17
       - image: << parameters.mysql_image >>
         environment:
           MYSQL_ALLOW_EMPTY_PASSWORD: yes
           MYSQL_ROOT_HOST: '%'
+          DATA_SOURCE_NAME: 'exporter:integration-test@/'
     parameters:
       mysql_image:
         type: string
@@ -31,6 +32,8 @@ jobs:
       - setup_remote_docker
       - run: docker version
       - run: docker-compose --version
+      - run: sudo apt-get install -y mysql-client
+      - run: mysql < scripts/test_grant.sql
       - run: make build
       - run: make test
   codespell:

Diff for: collector/exporter_test.go

@@ -26,7 +26,14 @@ import (
 	"github.com/smartystreets/goconvey/convey"
 )
 
-const dsn = "root@/mysql"
+var testDSN = "root@/mysql"
+
+func init() {
+	testDSNEnv := os.Getenv("DATA_SOURCE_NAME")
+	if testDSNEnv != ""
+		testDSN = testDSNEnv
+	}
+}
 
 func TestExporter(t *testing.T) {
 	if testing.Short() {
@@ -35,7 +42,7 @@ func TestExporter(t *testing.T) {
 
 	exporter := New(
 		context.Background(),
-		dsn,
+		testDSN,
 		NewMetrics(),
 		[]Scraper{
 			ScrapeGlobalStatus{},
@@ -79,7 +86,7 @@ func TestGetMySQLVersion(t *testing.T) {
 	logger = level.NewFilter(logger, level.AllowDebug())
 
 	convey.Convey("Version parsing", t, func() {
-		db, err := sql.Open("mysql", dsn)
+		db, err := sql.Open("mysql", testDSN)
 		convey.So(err, convey.ShouldBeNil)
 		defer db.Close()
 

Diff for: scripts/test_grant.sql

@@ -0,0 +1,5 @@
+CREATE USER 'exporter'@'localhost' IDENTIFIED BY 'integration-test' WITH MAX_USER_CONNECTIONS 3;
+GRANT PROCESS, REPLICATION CLIENT TO 'exporter'@'localhost';
+GRANT SELECT ON performance_schema.* TO 'exporter'@'localhost';
+GRANT SELECT ON information_schema.* TO 'exporter'@'localhost';
+