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// Copyright (C) MongoDB, Inc. 2022-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" "sync" "testing" "time" "go.mongodb.org/mongo-driver/bson" "go.mongodb.org/mongo-driver/event" "go.mongodb.org/mongo-driver/internal/assert" "go.mongodb.org/mongo-driver/internal/eventtest" "go.mongodb.org/mongo-driver/internal/require" "go.mongodb.org/mongo-driver/mongo/integration/mtest" "go.mongodb.org/mongo-driver/mongo/options" ) func TestRetryableReadsProse(t *testing.T) { tpm := eventtest.NewTestPoolMonitor() // Client options with MaxPoolSize of 1 and RetryReads used per the test description. // Lower HeartbeatInterval used to speed the test up for any server that uses streaming // heartbeats. Only connect to first host in list for sharded clusters. hosts := mtest.ClusterConnString().Hosts clientOpts := options.Client().SetMaxPoolSize(1).SetRetryReads(true). SetPoolMonitor(tpm.PoolMonitor).SetHeartbeatInterval(500 * time.Millisecond). SetHosts(hosts[:1]) mtOpts := mtest.NewOptions().ClientOptions(clientOpts).MinServerVersion("4.3") mt := mtest.New(t, mtOpts) mt.Run("PoolClearedError retryability", func(mt *mtest.T) { if mtest.ClusterTopologyKind() == mtest.LoadBalanced { mt.Skip("skipping as load balanced topology has different pool clearing behavior") } // Insert a document to test collection. _, err := mt.Coll.InsertOne(context.Background(), bson.D{{"x", 1}}) assert.Nil(mt, err, "InsertOne error: %v", err) // Force Find to block for 1 second once. mt.SetFailPoint(mtest.FailPoint{ ConfigureFailPoint: "failCommand", Mode: mtest.FailPointMode{ Times: 1, }, Data: mtest.FailPointData{ FailCommands: []string{"find"}, ErrorCode: 91, BlockConnection: true, BlockTimeMS: 1000, }, }) // Clear CMAP and command events. tpm.ClearEvents() mt.ClearEvents() // Perform a FindOne on two different threads and assert both operations are // successful. var wg sync.WaitGroup for i := 0; i < 2; i++ { wg.Add(1) go func() { defer wg.Done() res := mt.Coll.FindOne(context.Background(), bson.D{}) assert.Nil(mt, res.Err()) }() } wg.Wait() // Gather GetSucceeded, GetFailed and PoolCleared pool events. events := tpm.Events(func(e *event.PoolEvent) bool { getSucceeded := e.Type == event.GetSucceeded getFailed := e.Type == event.GetFailed poolCleared := e.Type == event.PoolCleared return getSucceeded || getFailed || poolCleared }) // Assert that first check out succeeds, pool is cleared, and second check // out fails due to connection error. assert.True(mt, len(events) >= 3, "expected at least 3 events, got %v", len(events)) assert.Equal(mt, event.GetSucceeded, events[0].Type, "expected ConnectionCheckedOut event, got %v", events[0].Type) assert.Equal(mt, event.PoolCleared, events[1].Type, "expected ConnectionPoolCleared event, got %v", events[1].Type) assert.Equal(mt, event.GetFailed, events[2].Type, "expected ConnectionCheckedOutFailed event, got %v", events[2].Type) assert.Equal(mt, event.ReasonConnectionErrored, events[2].Reason, "expected check out failure due to connection error, failed due to %q", events[2].Reason) // Assert that three find CommandStartedEvents were observed. for i := 0; i < 3; i++ { cmdEvt := mt.GetStartedEvent() assert.NotNil(mt, cmdEvt, "expected a find event, got nil") assert.Equal(mt, cmdEvt.CommandName, "find", "expected a find event, got a(n) %v event", cmdEvt.CommandName) } }) mtOpts = mtest.NewOptions().Topologies(mtest.Sharded).MinServerVersion("4.2") mt.RunOpts("retrying in sharded cluster", mtOpts, func(mt *mtest.T) { tests := []struct { name string // Note that setting this value greater than 2 will result in false // negatives. The current specification does not account for CSOT, which // might allow for an "infinite" number of retries over a period of time. // Because of this, we only track the "previous server". hostCount int failpointErrorCode int32 expectedFailCount int expectedSuccessCount int }{ { name: "retry on different mongos", hostCount: 2, failpointErrorCode: 6, // HostUnreachable expectedFailCount: 2, expectedSuccessCount: 0, }, { name: "retry on same mongos", hostCount: 1, failpointErrorCode: 6, // HostUnreachable expectedFailCount: 1, expectedSuccessCount: 1, }, } for _, tc := range tests { mt.Run(tc.name, func(mt *mtest.T) { hosts := options.Client().ApplyURI(mtest.ClusterURI()).Hosts require.GreaterOrEqualf(mt, len(hosts), tc.hostCount, "test cluster must have at least %v mongos hosts", tc.hostCount) // Configure the failpoint options for each mongos. failPoint := mtest.FailPoint{ ConfigureFailPoint: "failCommand", Mode: mtest.FailPointMode{ Times: 1, }, Data: mtest.FailPointData{ FailCommands: []string{"find"}, ErrorCode: tc.failpointErrorCode, CloseConnection: false, }, } // In order to ensure that each mongos in the hostCount-many mongos // hosts are tried at least once (i.e. failures are deprioritized), we // set a failpoint on all mongos hosts. The idea is that if we get // hostCount-many failures, then by the pigeonhole principal all mongos // hosts must have been tried. for i := 0; i < tc.hostCount; i++ { mt.ResetClient(options.Client().SetHosts([]string{hosts[i]})) mt.SetFailPoint(failPoint) // The automatic failpoint clearing may not clear failpoints set on // specific hosts, so manually clear the failpoint we set on the // specific mongos when the test is done. defer mt.ResetClient(options.Client().SetHosts([]string{hosts[i]})) defer mt.ClearFailPoints() } failCount := 0 successCount := 0 commandMonitor := &event.CommandMonitor{ Failed: func(context.Context, *event.CommandFailedEvent) { failCount++ }, Succeeded: func(context.Context, *event.CommandSucceededEvent) { successCount++ }, } // Reset the client with exactly hostCount-many mongos hosts. mt.ResetClient(options.Client(). SetHosts(hosts[:tc.hostCount]). SetRetryReads(true). SetMonitor(commandMonitor)) mt.Coll.FindOne(context.Background(), bson.D{}) assert.Equal(mt, tc.expectedFailCount, failCount) assert.Equal(mt, tc.expectedSuccessCount, successCount) }) } }) }