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// Copyright (C) MongoDB, Inc. 2017-present.
//
// 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
package integration
import (
"context"
"fmt"
"strings"
"testing"
"time"
"go.mongodb.org/mongo-driver/bson"
"go.mongodb.org/mongo-driver/internal/testutil/assert"
"go.mongodb.org/mongo-driver/mongo"
"go.mongodb.org/mongo-driver/mongo/integration/mtest"
"go.mongodb.org/mongo-driver/mongo/options"
)
func TestLoadBalancerSupport(t *testing.T) {
mt := mtest.New(t, mtest.NewOptions().Topologies(mtest.LoadBalanced).CreateClient(false))
defer mt.Close()
mt.Run("RunCommandCursor pins to a connection", func(mt *mtest.T) {
// The LB spec tests cover the behavior for cursors created by CRUD operations, but RunCommandCursor is
// Go-specific so there is no spec test coverage for it.
initCollection(mt, mt.Coll)
findCmd := bson.D{
{"find", mt.Coll.Name()},
{"filter", bson.D{}},
{"batchSize", 2},
}
cursor, err := mt.DB.RunCommandCursor(mtest.Background, findCmd)
assert.Nil(mt, err, "RunCommandCursor error: %v", err)
defer func() {
_ = cursor.Close(mtest.Background)
}()
assert.True(mt, cursor.ID() > 0, "expected cursor ID to be non-zero")
assert.Equal(mt, 1, mt.NumberConnectionsCheckedOut(),
"expected one connection to be checked out, got %d", mt.NumberConnectionsCheckedOut())
})
mt.RunOpts("wait queue timeout errors include extra information", noClientOpts, func(mt *mtest.T) {
// There are spec tests to assert this behavior, but they rely on the waitQueueTimeoutMS Client option, which is
// not supported in Go, so we have to skip them. These prose tests make the same assertions, but use context
// deadlines to force wait queue timeout errors.
assertErrorHasInfo := func(mt *mtest.T, err error, numCursorConns, numTxnConns, numOtherConns int) {
mt.Helper()
assert.NotNil(mt, err, "expected wait queue timeout error, got nil")
expectedMsg := fmt.Sprintf("maxPoolSize: 1, "+
"connections in use by cursors: %d, "+
"connections in use by transactions: %d, "+
"connections in use by other operations: %d",
numCursorConns, numTxnConns, numOtherConns,
)
assert.True(mt, strings.Contains(err.Error(), expectedMsg),
"expected error %q to contain substring %q", err, expectedMsg)
}
maxPoolSizeMtOpts := mtest.NewOptions().
ClientOptions(options.Client().SetMaxPoolSize(1))
mt.RunOpts("cursors", maxPoolSizeMtOpts, func(mt *mtest.T) {
initCollection(mt, mt.Coll)
findOpts := options.Find().SetBatchSize(2)
cursor, err := mt.Coll.Find(mtest.Background, bson.M{}, findOpts)
assert.Nil(mt, err, "Find error: %v", err)
defer func() {
_ = cursor.Close(mtest.Background)
}()
ctx, cancel := context.WithTimeout(mtest.Background, 5*time.Millisecond)
defer cancel()
_, err = mt.Coll.InsertOne(ctx, bson.M{"x": 1})
assertErrorHasInfo(mt, err, 1, 0, 0)
})
mt.RunOpts("transactions", maxPoolSizeMtOpts, func(mt *mtest.T) {
sess, err := mt.Client.StartSession()
assert.Nil(mt, err, "StartSession error: %v", err)
defer sess.EndSession(mtest.Background)
sessCtx := mongo.NewSessionContext(context.Background(), sess)
// Start a transaction and perform one transactional operation to pin a connection.
err = sess.StartTransaction()
assert.Nil(mt, err, "StartTransaction error: %v", err)
_, err = mt.Coll.InsertOne(sessCtx, bson.M{"x": 1})
assert.Nil(mt, err, "InsertOne error: %v", err)
ctx, cancel := context.WithTimeout(mtest.Background, 5*time.Millisecond)
defer cancel()
_, err = mt.Coll.InsertOne(ctx, bson.M{"x": 1})
assertErrorHasInfo(mt, err, 0, 1, 0)
})
})
}
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