forked from mongodb/mongo-go-driver
/
server.go
502 lines (461 loc) · 14.9 KB
/
server.go
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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 description
import (
"errors"
"fmt"
"time"
"go.mongodb.org/mongo-driver/bson"
"go.mongodb.org/mongo-driver/bson/primitive"
"go.mongodb.org/mongo-driver/internal/bsonutil"
"go.mongodb.org/mongo-driver/internal/handshake"
"go.mongodb.org/mongo-driver/internal/ptrutil"
"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.
// Deprecated: Use SessionTimeoutMinutesPtr instead.
SessionTimeoutMinutes uint32
SessionTimeoutMinutesPtr *int64
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 = 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 = 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 = 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 handshake.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)
desc.SessionTimeoutMinutesPtr = &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 = 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 ptrutil.CompareInt64(s.SessionTimeoutMinutesPtr, other.SessionTimeoutMinutesPtr) != 0 {
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
}
// stringSliceFromRawElement decodes the provided BSON element into a []string.
// This internally calls StringSliceFromRawValue on the element's value. The
// error conditions outlined in that function's documentation apply for this
// function as well.
func stringSliceFromRawElement(element bson.RawElement) ([]string, error) {
return bsonutil.StringSliceFromRawValue(element.Key(), element.Value())
}