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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 event_test
import (
"context"
"log"
"go.mongodb.org/mongo-driver/bson"
"go.mongodb.org/mongo-driver/event"
"go.mongodb.org/mongo-driver/mongo"
"go.mongodb.org/mongo-driver/mongo/options"
)
// Event examples
// CommandMonitor represents a monitor that is triggered for different events.
func ExampleCommandMonitor() {
// If the application makes multiple concurrent requests, it would have to
// use a concurrent map like sync.Map
startedCommands := make(map[int64]bson.Raw)
cmdMonitor := &event.CommandMonitor{
Started: func(_ context.Context, evt *event.CommandStartedEvent) {
startedCommands[evt.RequestID] = evt.Command
},
Succeeded: func(_ context.Context, evt *event.CommandSucceededEvent) {
log.Printf("Command: %v Reply: %v\n",
startedCommands[evt.RequestID],
evt.Reply,
)
// Empty "startedCommands" for the request ID to avoid a memory leak.
delete(startedCommands, evt.RequestID)
},
Failed: func(_ context.Context, evt *event.CommandFailedEvent) {
log.Printf("Command: %v Failure: %v\n",
startedCommands[evt.RequestID],
evt.Failure,
)
// Empty "startedCommands" for the request ID to avoid a memory leak.
delete(startedCommands, evt.RequestID)
},
}
clientOpts := options.Client().ApplyURI("mongodb://localhost:27017").SetMonitor(cmdMonitor)
client, err := mongo.Connect(context.Background(), clientOpts)
if err != nil {
log.Fatal(err)
}
defer func() {
if err = client.Disconnect(context.TODO()); err != nil {
log.Fatal(err)
}
}()
}