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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 // import "go.mongodb.org/mongo-driver/event"
import (
"context"
"go.mongodb.org/mongo-driver/bson"
"go.mongodb.org/mongo-driver/bson/primitive"
"go.mongodb.org/mongo-driver/mongo/address"
"go.mongodb.org/mongo-driver/mongo/description"
)
// CommandStartedEvent represents an event generated when a command is sent to a server.
type CommandStartedEvent struct {
Command bson.Raw
DatabaseName string
CommandName string
RequestID int64
ConnectionID string
// ServerConnectionID contains the connection ID from the server of the operation. If the server does not return
// this value (e.g. on MDB < 4.2), it is unset.
ServerConnectionID *int32
// ServiceID contains the ID of the server to which the command was sent if it is running behind a load balancer.
// Otherwise, it is unset.
ServiceID *primitive.ObjectID
}
// CommandFinishedEvent represents a generic command finishing.
type CommandFinishedEvent struct {
DurationNanos int64
CommandName string
RequestID int64
ConnectionID string
// ServerConnectionID contains the connection ID from the server of the operation. If the server does not return
// this value (e.g. on MDB < 4.2), it is unset.
ServerConnectionID *int32
// ServiceID contains the ID of the server to which the command was sent if it is running behind a load balancer.
// Otherwise, it is unset.
ServiceID *primitive.ObjectID
}
// CommandSucceededEvent represents an event generated when a command's execution succeeds.
type CommandSucceededEvent struct {
CommandFinishedEvent
Reply bson.Raw
}
// CommandFailedEvent represents an event generated when a command's execution fails.
type CommandFailedEvent struct {
CommandFinishedEvent
Failure string
}
// CommandMonitor represents a monitor that is triggered for different events.
type CommandMonitor struct {
Started func(context.Context, *CommandStartedEvent)
Succeeded func(context.Context, *CommandSucceededEvent)
Failed func(context.Context, *CommandFailedEvent)
}
// strings for pool command monitoring reasons
const (
ReasonIdle = "idle"
ReasonPoolClosed = "poolClosed"
ReasonStale = "stale"
ReasonConnectionErrored = "connectionError"
ReasonTimedOut = "timeout"
)
// strings for pool command monitoring types
const (
ConnectionClosed = "ConnectionClosed"
PoolCreated = "ConnectionPoolCreated"
ConnectionCreated = "ConnectionCreated"
ConnectionReady = "ConnectionReady"
GetFailed = "ConnectionCheckOutFailed"
GetSucceeded = "ConnectionCheckedOut"
ConnectionReturned = "ConnectionCheckedIn"
PoolCleared = "ConnectionPoolCleared"
PoolClosedEvent = "ConnectionPoolClosed"
)
// MonitorPoolOptions contains pool options as formatted in pool events
type MonitorPoolOptions struct {
MaxPoolSize uint64 `json:"maxPoolSize"`
MinPoolSize uint64 `json:"minPoolSize"`
WaitQueueTimeoutMS uint64 `json:"maxIdleTimeMS"`
}
// PoolEvent contains all information summarizing a pool event
type PoolEvent struct {
Type string `json:"type"`
Address string `json:"address"`
ConnectionID uint64 `json:"connectionId"`
PoolOptions *MonitorPoolOptions `json:"options"`
Reason string `json:"reason"`
// ServiceID is only set if the Type is PoolCleared and the server is deployed behind a load balancer. This field
// can be used to distinguish between individual servers in a load balanced deployment.
ServiceID *primitive.ObjectID `json:"serviceId"`
}
// PoolMonitor is a function that allows the user to gain access to events occurring in the pool
type PoolMonitor struct {
Event func(*PoolEvent)
}
// ServerDescriptionChangedEvent represents a server description change.
type ServerDescriptionChangedEvent struct {
Address address.Address
TopologyID primitive.ObjectID // A unique identifier for the topology this server is a part of
PreviousDescription description.Server
NewDescription description.Server
}
// ServerOpeningEvent is an event generated when the server is initialized.
type ServerOpeningEvent struct {
Address address.Address
TopologyID primitive.ObjectID // A unique identifier for the topology this server is a part of
}
// ServerClosedEvent is an event generated when the server is closed.
type ServerClosedEvent struct {
Address address.Address
TopologyID primitive.ObjectID // A unique identifier for the topology this server is a part of
}
// TopologyDescriptionChangedEvent represents a topology description change.
type TopologyDescriptionChangedEvent struct {
TopologyID primitive.ObjectID // A unique identifier for the topology this server is a part of
PreviousDescription description.Topology
NewDescription description.Topology
}
// TopologyOpeningEvent is an event generated when the topology is initialized.
type TopologyOpeningEvent struct {
TopologyID primitive.ObjectID // A unique identifier for the topology this server is a part of
}
// TopologyClosedEvent is an event generated when the topology is closed.
type TopologyClosedEvent struct {
TopologyID primitive.ObjectID // A unique identifier for the topology this server is a part of
}
// ServerHeartbeatStartedEvent is an event generated when the heartbeat is started.
type ServerHeartbeatStartedEvent struct {
ConnectionID string // The address this heartbeat was sent to with a unique identifier
Awaited bool // If this heartbeat was awaitable
}
// ServerHeartbeatSucceededEvent is an event generated when the heartbeat succeeds.
type ServerHeartbeatSucceededEvent struct {
DurationNanos int64
Reply description.Server
ConnectionID string // The address this heartbeat was sent to with a unique identifier
Awaited bool // If this heartbeat was awaitable
}
// ServerHeartbeatFailedEvent is an event generated when the heartbeat fails.
type ServerHeartbeatFailedEvent struct {
DurationNanos int64
Failure error
ConnectionID string // The address this heartbeat was sent to with a unique identifier
Awaited bool // If this heartbeat was awaitable
}
// ServerMonitor represents a monitor that is triggered for different server events. The client
// will monitor changes on the MongoDB deployment it is connected to, and this monitor reports
// the changes in the client's representation of the deployment. The topology represents the
// overall deployment, and heartbeats are sent to individual servers to check their current status.
type ServerMonitor struct {
ServerDescriptionChanged func(*ServerDescriptionChangedEvent)
ServerOpening func(*ServerOpeningEvent)
ServerClosed func(*ServerClosedEvent)
// TopologyDescriptionChanged is called when the topology is locked, so the callback should
// not attempt any operation that requires server selection on the same client.
TopologyDescriptionChanged func(*TopologyDescriptionChangedEvent)
TopologyOpening func(*TopologyOpeningEvent)
TopologyClosed func(*TopologyClosedEvent)
ServerHeartbeatStarted func(*ServerHeartbeatStartedEvent)
ServerHeartbeatSucceeded func(*ServerHeartbeatSucceededEvent)
ServerHeartbeatFailed func(*ServerHeartbeatFailedEvent)
}
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