489 lines
14 KiB
Go
489 lines
14 KiB
Go
|
// 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 description
|
||
|
|
|
||
|
|
import (
|
||
|
|
"errors"
|
||
|
|
"fmt"
|
||
|
|
"time"
|
||
|
|
|
||
|
|
"go.mongodb.org/mongo-driver/bson"
|
||
|
|
"go.mongodb.org/mongo-driver/bson/primitive"
|
||
|
|
"go.mongodb.org/mongo-driver/internal"
|
||
|
|
"go.mongodb.org/mongo-driver/mongo/address"
|
||
|
|
"go.mongodb.org/mongo-driver/tag"
|
||
|
|
)
|
||
|
|
|
||
|
|
// SelectedServer augments the Server type by also including the TopologyKind of the topology that includes the server.
|
||
|
|
// This type should be used to track the state of a server that was selected to perform an operation.
|
||
|
|
type SelectedServer struct {
|
||
|
|
Server
|
||
|
|
Kind TopologyKind
|
||
|
|
}
|
||
|
|
|
||
|
|
// Server contains information about a node in a cluster. This is created from hello command responses. If the value
|
||
|
|
// of the Kind field is LoadBalancer, only the Addr and Kind fields will be set. All other fields will be set to the
|
||
|
|
// zero value of the field's type.
|
||
|
|
type Server struct {
|
||
|
|
Addr address.Address
|
||
|
|
|
||
|
|
Arbiters []string
|
||
|
|
AverageRTT time.Duration
|
||
|
|
AverageRTTSet bool
|
||
|
|
Compression []string // compression methods returned by server
|
||
|
|
CanonicalAddr address.Address
|
||
|
|
ElectionID primitive.ObjectID
|
||
|
|
HeartbeatInterval time.Duration
|
||
|
|
HelloOK bool
|
||
|
|
Hosts []string
|
||
|
|
IsCryptd bool
|
||
|
|
LastError error
|
||
|
|
LastUpdateTime time.Time
|
||
|
|
LastWriteTime time.Time
|
||
|
|
MaxBatchCount uint32
|
||
|
|
MaxDocumentSize uint32
|
||
|
|
MaxMessageSize uint32
|
||
|
|
Members []address.Address
|
||
|
|
Passives []string
|
||
|
|
Passive bool
|
||
|
|
Primary address.Address
|
||
|
|
ReadOnly bool
|
||
|
|
ServiceID *primitive.ObjectID // Only set for servers that are deployed behind a load balancer.
|
||
|
|
SessionTimeoutMinutes uint32
|
||
|
|
SetName string
|
||
|
|
SetVersion uint32
|
||
|
|
Tags tag.Set
|
||
|
|
TopologyVersion *TopologyVersion
|
||
|
|
Kind ServerKind
|
||
|
|
WireVersion *VersionRange
|
||
|
|
}
|
||
|
|
|
||
|
|
// NewServer creates a new server description from the given hello command response.
|
||
|
|
func NewServer(addr address.Address, response bson.Raw) Server {
|
||
|
|
desc := Server{Addr: addr, CanonicalAddr: addr, LastUpdateTime: time.Now().UTC()}
|
||
|
|
elements, err := response.Elements()
|
||
|
|
if err != nil {
|
||
|
|
desc.LastError = err
|
||
|
|
return desc
|
||
|
|
}
|
||
|
|
var ok bool
|
||
|
|
var isReplicaSet, isWritablePrimary, hidden, secondary, arbiterOnly bool
|
||
|
|
var msg string
|
||
|
|
var versionRange VersionRange
|
||
|
|
for _, element := range elements {
|
||
|
|
switch element.Key() {
|
||
|
|
case "arbiters":
|
||
|
|
var err error
|
||
|
|
desc.Arbiters, err = internal.StringSliceFromRawElement(element)
|
||
|
|
if err != nil {
|
||
|
|
desc.LastError = err
|
||
|
|
return desc
|
||
|
|
}
|
||
|
|
case "arbiterOnly":
|
||
|
|
arbiterOnly, ok = element.Value().BooleanOK()
|
||
|
|
if !ok {
|
||
|
|
desc.LastError = fmt.Errorf("expected 'arbiterOnly' to be a boolean but it's a BSON %s", element.Value().Type)
|
||
|
|
return desc
|
||
|
|
}
|
||
|
|
case "compression":
|
||
|
|
var err error
|
||
|
|
desc.Compression, err = internal.StringSliceFromRawElement(element)
|
||
|
|
if err != nil {
|
||
|
|
desc.LastError = err
|
||
|
|
return desc
|
||
|
|
}
|
||
|
|
case "electionId":
|
||
|
|
desc.ElectionID, ok = element.Value().ObjectIDOK()
|
||
|
|
if !ok {
|
||
|
|
desc.LastError = fmt.Errorf("expected 'electionId' to be a objectID but it's a BSON %s", element.Value().Type)
|
||
|
|
return desc
|
||
|
|
}
|
||
|
|
case "iscryptd":
|
||
|
|
desc.IsCryptd, ok = element.Value().BooleanOK()
|
||
|
|
if !ok {
|
||
|
|
desc.LastError = fmt.Errorf("expected 'iscryptd' to be a boolean but it's a BSON %s", element.Value().Type)
|
||
|
|
return desc
|
||
|
|
}
|
||
|
|
case "helloOk":
|
||
|
|
desc.HelloOK, ok = element.Value().BooleanOK()
|
||
|
|
if !ok {
|
||
|
|
desc.LastError = fmt.Errorf("expected 'helloOk' to be a boolean but it's a BSON %s", element.Value().Type)
|
||
|
|
return desc
|
||
|
|
}
|
||
|
|
case "hidden":
|
||
|
|
hidden, ok = element.Value().BooleanOK()
|
||
|
|
if !ok {
|
||
|
|
desc.LastError = fmt.Errorf("expected 'hidden' to be a boolean but it's a BSON %s", element.Value().Type)
|
||
|
|
return desc
|
||
|
|
}
|
||
|
|
case "hosts":
|
||
|
|
var err error
|
||
|
|
desc.Hosts, err = internal.StringSliceFromRawElement(element)
|
||
|
|
if err != nil {
|
||
|
|
desc.LastError = err
|
||
|
|
return desc
|
||
|
|
}
|
||
|
|
case "isWritablePrimary":
|
||
|
|
isWritablePrimary, ok = element.Value().BooleanOK()
|
||
|
|
if !ok {
|
||
|
|
desc.LastError = fmt.Errorf("expected 'isWritablePrimary' to be a boolean but it's a BSON %s", element.Value().Type)
|
||
|
|
return desc
|
||
|
|
}
|
||
|
|
case internal.LegacyHelloLowercase:
|
||
|
|
isWritablePrimary, ok = element.Value().BooleanOK()
|
||
|
|
if !ok {
|
||
|
|
desc.LastError = fmt.Errorf("expected legacy hello to be a boolean but it's a BSON %s", element.Value().Type)
|
||
|
|
return desc
|
||
|
|
}
|
||
|
|
case "isreplicaset":
|
||
|
|
isReplicaSet, ok = element.Value().BooleanOK()
|
||
|
|
if !ok {
|
||
|
|
desc.LastError = fmt.Errorf("expected 'isreplicaset' to be a boolean but it's a BSON %s", element.Value().Type)
|
||
|
|
return desc
|
||
|
|
}
|
||
|
|
case "lastWrite":
|
||
|
|
lastWrite, ok := element.Value().DocumentOK()
|
||
|
|
if !ok {
|
||
|
|
desc.LastError = fmt.Errorf("expected 'lastWrite' to be a document but it's a BSON %s", element.Value().Type)
|
||
|
|
return desc
|
||
|
|
}
|
||
|
|
dateTime, err := lastWrite.LookupErr("lastWriteDate")
|
||
|
|
if err == nil {
|
||
|
|
dt, ok := dateTime.DateTimeOK()
|
||
|
|
if !ok {
|
||
|
|
desc.LastError = fmt.Errorf("expected 'lastWriteDate' to be a datetime but it's a BSON %s", dateTime.Type)
|
||
|
|
return desc
|
||
|
|
}
|
||
|
|
desc.LastWriteTime = time.Unix(dt/1000, dt%1000*1000000).UTC()
|
||
|
|
}
|
||
|
|
case "logicalSessionTimeoutMinutes":
|
||
|
|
i64, ok := element.Value().AsInt64OK()
|
||
|
|
if !ok {
|
||
|
|
desc.LastError = fmt.Errorf("expected 'logicalSessionTimeoutMinutes' to be an integer but it's a BSON %s", element.Value().Type)
|
||
|
|
return desc
|
||
|
|
}
|
||
|
|
desc.SessionTimeoutMinutes = uint32(i64)
|
||
|
|
case "maxBsonObjectSize":
|
||
|
|
i64, ok := element.Value().AsInt64OK()
|
||
|
|
if !ok {
|
||
|
|
desc.LastError = fmt.Errorf("expected 'maxBsonObjectSize' to be an integer but it's a BSON %s", element.Value().Type)
|
||
|
|
return desc
|
||
|
|
}
|
||
|
|
desc.MaxDocumentSize = uint32(i64)
|
||
|
|
case "maxMessageSizeBytes":
|
||
|
|
i64, ok := element.Value().AsInt64OK()
|
||
|
|
if !ok {
|
||
|
|
desc.LastError = fmt.Errorf("expected 'maxMessageSizeBytes' to be an integer but it's a BSON %s", element.Value().Type)
|
||
|
|
return desc
|
||
|
|
}
|
||
|
|
desc.MaxMessageSize = uint32(i64)
|
||
|
|
case "maxWriteBatchSize":
|
||
|
|
i64, ok := element.Value().AsInt64OK()
|
||
|
|
if !ok {
|
||
|
|
desc.LastError = fmt.Errorf("expected 'maxWriteBatchSize' to be an integer but it's a BSON %s", element.Value().Type)
|
||
|
|
return desc
|
||
|
|
}
|
||
|
|
desc.MaxBatchCount = uint32(i64)
|
||
|
|
case "me":
|
||
|
|
me, ok := element.Value().StringValueOK()
|
||
|
|
if !ok {
|
||
|
|
desc.LastError = fmt.Errorf("expected 'me' to be a string but it's a BSON %s", element.Value().Type)
|
||
|
|
return desc
|
||
|
|
}
|
||
|
|
desc.CanonicalAddr = address.Address(me).Canonicalize()
|
||
|
|
case "maxWireVersion":
|
||
|
|
versionRange.Max, ok = element.Value().AsInt32OK()
|
||
|
|
if !ok {
|
||
|
|
desc.LastError = fmt.Errorf("expected 'maxWireVersion' to be an integer but it's a BSON %s", element.Value().Type)
|
||
|
|
return desc
|
||
|
|
}
|
||
|
|
case "minWireVersion":
|
||
|
|
versionRange.Min, ok = element.Value().AsInt32OK()
|
||
|
|
if !ok {
|
||
|
|
desc.LastError = fmt.Errorf("expected 'minWireVersion' to be an integer but it's a BSON %s", element.Value().Type)
|
||
|
|
return desc
|
||
|
|
}
|
||
|
|
case "msg":
|
||
|
|
msg, ok = element.Value().StringValueOK()
|
||
|
|
if !ok {
|
||
|
|
desc.LastError = fmt.Errorf("expected 'msg' to be a string but it's a BSON %s", element.Value().Type)
|
||
|
|
return desc
|
||
|
|
}
|
||
|
|
case "ok":
|
||
|
|
okay, ok := element.Value().AsInt32OK()
|
||
|
|
if !ok {
|
||
|
|
desc.LastError = fmt.Errorf("expected 'ok' to be a boolean but it's a BSON %s", element.Value().Type)
|
||
|
|
return desc
|
||
|
|
}
|
||
|
|
if okay != 1 {
|
||
|
|
desc.LastError = errors.New("not ok")
|
||
|
|
return desc
|
||
|
|
}
|
||
|
|
case "passives":
|
||
|
|
var err error
|
||
|
|
desc.Passives, err = internal.StringSliceFromRawElement(element)
|
||
|
|
if err != nil {
|
||
|
|
desc.LastError = err
|
||
|
|
return desc
|
||
|
|
}
|
||
|
|
case "passive":
|
||
|
|
desc.Passive, ok = element.Value().BooleanOK()
|
||
|
|
if !ok {
|
||
|
|
desc.LastError = fmt.Errorf("expected 'passive' to be a boolean but it's a BSON %s", element.Value().Type)
|
||
|
|
return desc
|
||
|
|
}
|
||
|
|
case "primary":
|
||
|
|
primary, ok := element.Value().StringValueOK()
|
||
|
|
if !ok {
|
||
|
|
desc.LastError = fmt.Errorf("expected 'primary' to be a string but it's a BSON %s", element.Value().Type)
|
||
|
|
return desc
|
||
|
|
}
|
||
|
|
desc.Primary = address.Address(primary)
|
||
|
|
case "readOnly":
|
||
|
|
desc.ReadOnly, ok = element.Value().BooleanOK()
|
||
|
|
if !ok {
|
||
|
|
desc.LastError = fmt.Errorf("expected 'readOnly' to be a boolean but it's a BSON %s", element.Value().Type)
|
||
|
|
return desc
|
||
|
|
}
|
||
|
|
case "secondary":
|
||
|
|
secondary, ok = element.Value().BooleanOK()
|
||
|
|
if !ok {
|
||
|
|
desc.LastError = fmt.Errorf("expected 'secondary' to be a boolean but it's a BSON %s", element.Value().Type)
|
||
|
|
return desc
|
||
|
|
}
|
||
|
|
case "serviceId":
|
||
|
|
oid, ok := element.Value().ObjectIDOK()
|
||
|
|
if !ok {
|
||
|
|
desc.LastError = fmt.Errorf("expected 'serviceId' to be an ObjectId but it's a BSON %s", element.Value().Type)
|
||
|
|
}
|
||
|
|
desc.ServiceID = &oid
|
||
|
|
case "setName":
|
||
|
|
desc.SetName, ok = element.Value().StringValueOK()
|
||
|
|
if !ok {
|
||
|
|
desc.LastError = fmt.Errorf("expected 'setName' to be a string but it's a BSON %s", element.Value().Type)
|
||
|
|
return desc
|
||
|
|
}
|
||
|
|
case "setVersion":
|
||
|
|
i64, ok := element.Value().AsInt64OK()
|
||
|
|
if !ok {
|
||
|
|
desc.LastError = fmt.Errorf("expected 'setVersion' to be an integer but it's a BSON %s", element.Value().Type)
|
||
|
|
return desc
|
||
|
|
}
|
||
|
|
desc.SetVersion = uint32(i64)
|
||
|
|
case "tags":
|
||
|
|
m, err := decodeStringMap(element, "tags")
|
||
|
|
if err != nil {
|
||
|
|
desc.LastError = err
|
||
|
|
return desc
|
||
|
|
}
|
||
|
|
desc.Tags = tag.NewTagSetFromMap(m)
|
||
|
|
case "topologyVersion":
|
||
|
|
doc, ok := element.Value().DocumentOK()
|
||
|
|
if !ok {
|
||
|
|
desc.LastError = fmt.Errorf("expected 'topologyVersion' to be a document but it's a BSON %s", element.Value().Type)
|
||
|
|
return desc
|
||
|
|
}
|
||
|
|
|
||
|
|
desc.TopologyVersion, err = NewTopologyVersion(doc)
|
||
|
|
if err != nil {
|
||
|
|
desc.LastError = err
|
||
|
|
return desc
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
for _, host := range desc.Hosts {
|
||
|
|
desc.Members = append(desc.Members, address.Address(host).Canonicalize())
|
||
|
|
}
|
||
|
|
|
||
|
|
for _, passive := range desc.Passives {
|
||
|
|
desc.Members = append(desc.Members, address.Address(passive).Canonicalize())
|
||
|
|
}
|
||
|
|
|
||
|
|
for _, arbiter := range desc.Arbiters {
|
||
|
|
desc.Members = append(desc.Members, address.Address(arbiter).Canonicalize())
|
||
|
|
}
|
||
|
|
|
||
|
|
desc.Kind = Standalone
|
||
|
|
|
||
|
|
if isReplicaSet {
|
||
|
|
desc.Kind = RSGhost
|
||
|
|
} else if desc.SetName != "" {
|
||
|
|
if isWritablePrimary {
|
||
|
|
desc.Kind = RSPrimary
|
||
|
|
} else if hidden {
|
||
|
|
desc.Kind = RSMember
|
||
|
|
} else if secondary {
|
||
|
|
desc.Kind = RSSecondary
|
||
|
|
} else if arbiterOnly {
|
||
|
|
desc.Kind = RSArbiter
|
||
|
|
} else {
|
||
|
|
desc.Kind = RSMember
|
||
|
|
}
|
||
|
|
} else if msg == "isdbgrid" {
|
||
|
|
desc.Kind = Mongos
|
||
|
|
}
|
||
|
|
|
||
|
|
desc.WireVersion = &versionRange
|
||
|
|
|
||
|
|
return desc
|
||
|
|
}
|
||
|
|
|
||
|
|
// NewDefaultServer creates a new unknown server description with the given address.
|
||
|
|
func NewDefaultServer(addr address.Address) Server {
|
||
|
|
return NewServerFromError(addr, nil, nil)
|
||
|
|
}
|
||
|
|
|
||
|
|
// NewServerFromError creates a new unknown server description with the given parameters.
|
||
|
|
func NewServerFromError(addr address.Address, err error, tv *TopologyVersion) Server {
|
||
|
|
return Server{
|
||
|
|
Addr: addr,
|
||
|
|
LastError: err,
|
||
|
|
Kind: Unknown,
|
||
|
|
TopologyVersion: tv,
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// SetAverageRTT sets the average round trip time for this server description.
|
||
|
|
func (s Server) SetAverageRTT(rtt time.Duration) Server {
|
||
|
|
s.AverageRTT = rtt
|
||
|
|
s.AverageRTTSet = true
|
||
|
|
return s
|
||
|
|
}
|
||
|
|
|
||
|
|
// DataBearing returns true if the server is a data bearing server.
|
||
|
|
func (s Server) DataBearing() bool {
|
||
|
|
return s.Kind == RSPrimary ||
|
||
|
|
s.Kind == RSSecondary ||
|
||
|
|
s.Kind == Mongos ||
|
||
|
|
s.Kind == Standalone
|
||
|
|
}
|
||
|
|
|
||
|
|
// LoadBalanced returns true if the server is a load balancer or is behind a load balancer.
|
||
|
|
func (s Server) LoadBalanced() bool {
|
||
|
|
return s.Kind == LoadBalancer || s.ServiceID != nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// String implements the Stringer interface
|
||
|
|
func (s Server) String() string {
|
||
|
|
str := fmt.Sprintf("Addr: %s, Type: %s",
|
||
|
|
s.Addr, s.Kind)
|
||
|
|
if len(s.Tags) != 0 {
|
||
|
|
str += fmt.Sprintf(", Tag sets: %s", s.Tags)
|
||
|
|
}
|
||
|
|
|
||
|
|
if s.AverageRTTSet {
|
||
|
|
str += fmt.Sprintf(", Average RTT: %d", s.AverageRTT)
|
||
|
|
}
|
||
|
|
|
||
|
|
if s.LastError != nil {
|
||
|
|
str += fmt.Sprintf(", Last error: %s", s.LastError)
|
||
|
|
}
|
||
|
|
return str
|
||
|
|
}
|
||
|
|
|
||
|
|
func decodeStringMap(element bson.RawElement, name string) (map[string]string, error) {
|
||
|
|
doc, ok := element.Value().DocumentOK()
|
||
|
|
if !ok {
|
||
|
|
return nil, fmt.Errorf("expected '%s' to be a document but it's a BSON %s", name, element.Value().Type)
|
||
|
|
}
|
||
|
|
elements, err := doc.Elements()
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
m := make(map[string]string)
|
||
|
|
for _, element := range elements {
|
||
|
|
key := element.Key()
|
||
|
|
value, ok := element.Value().StringValueOK()
|
||
|
|
if !ok {
|
||
|
|
return nil, fmt.Errorf("expected '%s' to be a document of strings, but found a BSON %s", name, element.Value().Type)
|
||
|
|
}
|
||
|
|
m[key] = value
|
||
|
|
}
|
||
|
|
return m, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// Equal compares two server descriptions and returns true if they are equal
|
||
|
|
func (s Server) Equal(other Server) bool {
|
||
|
|
if s.CanonicalAddr.String() != other.CanonicalAddr.String() {
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
|
||
|
|
if !sliceStringEqual(s.Arbiters, other.Arbiters) {
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
|
||
|
|
if !sliceStringEqual(s.Hosts, other.Hosts) {
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
|
||
|
|
if !sliceStringEqual(s.Passives, other.Passives) {
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
|
||
|
|
if s.Primary != other.Primary {
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
|
||
|
|
if s.SetName != other.SetName {
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
|
||
|
|
if s.Kind != other.Kind {
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
|
||
|
|
if s.LastError != nil || other.LastError != nil {
|
||
|
|
if s.LastError == nil || other.LastError == nil {
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
if s.LastError.Error() != other.LastError.Error() {
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if !s.WireVersion.Equals(other.WireVersion) {
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
|
||
|
|
if len(s.Tags) != len(other.Tags) || !s.Tags.ContainsAll(other.Tags) {
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
|
||
|
|
if s.SetVersion != other.SetVersion {
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
|
||
|
|
if s.ElectionID != other.ElectionID {
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
|
||
|
|
if s.SessionTimeoutMinutes != other.SessionTimeoutMinutes {
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
|
||
|
|
// If TopologyVersion is nil for both servers, CompareToIncoming will return -1 because it assumes that the
|
||
|
|
// incoming response is newer. We want the descriptions to be considered equal in this case, though, so an
|
||
|
|
// explicit check is required.
|
||
|
|
if s.TopologyVersion == nil && other.TopologyVersion == nil {
|
||
|
|
return true
|
||
|
|
}
|
||
|
|
return s.TopologyVersion.CompareToIncoming(other.TopologyVersion) == 0
|
||
|
|
}
|
||
|
|
|
||
|
|
func sliceStringEqual(a []string, b []string) bool {
|
||
|
|
if len(a) != len(b) {
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
for i, v := range a {
|
||
|
|
if v != b[i] {
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return true
|
||
|
|
}
|