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57 lines
2.6 KiB
57 lines
2.6 KiB
3 years ago
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// Copyright (C) MongoDB, Inc. 2017-present.
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may
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// not use this file except in compliance with the License. You may obtain
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// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
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// Package event is a library for monitoring events from the MongoDB Go
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// driver. Monitors can be set for commands sent to the MongoDB cluster,
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// connection pool changes, or changes on the MongoDB cluster.
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//
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// Monitoring commands requires specifying a CommandMonitor when constructing
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// a mongo.Client. A CommandMonitor can be set to monitor started, succeeded,
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// and/or failed events. A CommandStartedEvent can be correlated to its matching
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// CommandSucceededEvent or CommandFailedEvent through the RequestID field. For
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// example, the following code collects the names of started events:
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//
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// var commandStarted []string
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// cmdMonitor := &event.CommandMonitor{
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// Started: func(_ context.Context, evt *event.CommandStartedEvent) {
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// commandStarted = append(commandStarted, evt.CommandName)
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// },
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// }
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// clientOpts := options.Client().ApplyURI("mongodb://localhost:27017").SetMonitor(cmdMonitor)
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// client, err := mongo.Connect(context.Background(), clientOpts)
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//
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// Monitoring the connection pool requires specifying a PoolMonitor when constructing
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// a mongo.Client. The following code tracks the number of checked out connections:
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//
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// var int connsCheckedOut
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// poolMonitor := &event.PoolMonitor{
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// Event: func(evt *event.PoolEvent) {
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// switch evt.Type {
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// case event.GetSucceeded:
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// connsCheckedOut++
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// case event.ConnectionReturned:
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// connsCheckedOut--
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// }
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// },
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// }
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// clientOpts := options.Client().ApplyURI("mongodb://localhost:27017").SetPoolMonitor(poolMonitor)
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// client, err := mongo.Connect(context.Background(), clientOpts)
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//
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// Monitoring server changes specifying a ServerMonitor object when constructing
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// a mongo.Client. Different functions can be set on the ServerMonitor to
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// monitor different kinds of events. See ServerMonitor for more details.
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// The following code appends ServerHeartbeatStartedEvents to a slice:
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//
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// var heartbeatStarted []*event.ServerHeartbeatStartedEvent
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// svrMonitor := &event.ServerMonitor{
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// ServerHeartbeatStarted: func(e *event.ServerHeartbeatStartedEvent) {
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// heartbeatStarted = append(heartbeatStarted, e)
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// }
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// }
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// clientOpts := options.Client().ApplyURI("mongodb://localhost:27017").SetServerMonitor(svrMonitor)
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// client, err := mongo.Connect(context.Background(), clientOpts)
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package event
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