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// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// connection_test.go provides some helpers for basic connectivity tests to Cloud SQL instances.
package tests
import (
"context"
"database/sql"
"fmt"
"sync"
"testing"
)
// proxyConnTest is a test helper to verify the proxy works with a basic connectivity test.
func proxyConnTest(t *testing.T, connName, driver, dsn string, port int, dir string) {
ctx := context.Background()
var args []string
if dir != "" { // unix port
args = append(args, fmt.Sprintf("-dir=%s", dir), fmt.Sprintf("-instances=%s", connName))
} else { // tcp socket
args = append(args, fmt.Sprintf("-instances=%s=tcp:%d", connName, port))
}
// Start the proxy
p, err := StartProxy(ctx, args...)
if err != nil {
t.Fatalf("unable to start proxy: %v", err)
}
defer p.Close()
output, err := p.WaitForServe(ctx)
if err != nil {
t.Fatalf("unable to verify proxy was serving: %s \n %s", err, output)
}
// Connect to the instance
db, err := sql.Open(driver, dsn)
if err != nil {
t.Fatalf("unable to connect to db: %s", err)
}
defer db.Close()
_, err = db.Exec("SELECT 1;")
if err != nil {
t.Fatalf("unable to exec on db: %s", err)
}
}
func proxyConnLimitTest(t *testing.T, connName, driver, dsn string, port int) {
ctx := context.Background()
maxConn, totConn := 5, 10
// Start the proxy
p, err := StartProxy(ctx, fmt.Sprintf("-instances=%s=tcp:%d", connName, port), fmt.Sprintf("-max_connections=%d", maxConn))
if err != nil {
t.Fatalf("unable to start proxy: %v", err)
}
defer p.Close()
output, err := p.WaitForServe(ctx)
if err != nil {
t.Fatalf("unable to verify proxy was serving: %s \n %s", err, output)
}
// Create connection pool
var stmt string
switch driver {
case "mysql":
stmt = "SELECT sleep(2);"
case "postgres":
stmt = "SELECT pg_sleep(2);"
case "sqlserver":
stmt = "WAITFOR DELAY '00:00:02'"
default:
t.Fatalf("unsupported driver: no sleep query found")
}
db, err := sql.Open(driver, dsn)
if err != nil {
t.Fatalf("unable to connect to db: %s", err)
}
db.SetMaxIdleConns(0)
defer db.Close()
// Connect with up to totConn and count errors
var wg sync.WaitGroup
c := make(chan error, totConn)
for i := 0; i < totConn; i++ {
wg.Add(1)
go func() {
defer wg.Done()
_, err := db.ExecContext(ctx, stmt)
if err != nil {
c <- err
}
}()
}
wg.Wait()
close(c)
var errs []error
for e := range c {
errs = append(errs, e)
}
want, got := totConn-maxConn, len(errs)
if want != got {
t.Errorf("wrong errCt - want: %d, got %d", want, got)
for _, e := range errs {
t.Errorf("%s\n", e)
}
t.Fail()
}
}
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