/
server.go
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/
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/primitive"
"go.mongodb.org/mongo-driver/tag"
"go.mongodb.org/mongo-driver/x/bsonx/bsoncore"
"go.mongodb.org/mongo-driver/x/mongo/driver/address"
)
// UnsetRTT is the unset value for a round trip time.
const UnsetRTT = -1 * time.Millisecond
// SelectedServer represents a selected server that is a member of a topology.
type SelectedServer struct {
Server
Kind TopologyKind
}
// Server represents a description of a server. This is created from an isMaster
// command.
type Server struct {
Addr address.Address
AverageRTT time.Duration
AverageRTTSet bool
Compression []string // compression methods returned by server
CanonicalAddr address.Address
ElectionID primitive.ObjectID
HeartbeatInterval time.Duration
LastError error
LastUpdateTime time.Time
LastWriteTime time.Time
MaxBatchCount uint32
MaxDocumentSize uint32
MaxMessageSize uint32
Members []address.Address
ReadOnly bool
SessionTimeoutMinutes uint32
SetName string
SetVersion uint32
SpeculativeAuthenticate bsoncore.Document
Tags tag.Set
TopologyVersion *TopologyVersion
Kind ServerKind
WireVersion *VersionRange
SaslSupportedMechs []string // user-specific from server handshake
}
// NewServer creates a new server description from the given parameters.
func NewServer(addr address.Address, response bsoncore.Document) 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, isMaster, hidden, secondary, arbiterOnly bool
var msg string
var version VersionRange
var hosts, passives, arbiters []string
for _, element := range elements {
switch element.Key() {
case "arbiters":
var err error
arbiters, err = decodeStringSlice(element, "arbiters")
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 = decodeStringSlice(element, "compression")
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 "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
hosts, err = decodeStringSlice(element, "hosts")
if err != nil {
desc.LastError = err
return desc
}
case "ismaster":
isMaster, ok = element.Value().BooleanOK()
if !ok {
desc.LastError = fmt.Errorf("expected 'isMaster' 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":
version.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":
version.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
passives, err = decodeStringSlice(element, "passives")
if err != nil {
desc.LastError = err
return desc
}
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 "saslSupportedMechs":
var err error
desc.SaslSupportedMechs, err = decodeStringSlice(element, "saslSupportedMechs")
if err != nil {
desc.LastError = err
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 "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 "speculativeAuthenticate":
desc.SpeculativeAuthenticate, ok = element.Value().DocumentOK()
if !ok {
desc.LastError = fmt.Errorf("expected 'speculativeAuthenticate' to be a document but it's a BSON %s",
element.Value().Type)
return desc
}
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 hosts {
desc.Members = append(desc.Members, address.Address(host).Canonicalize())
}
for _, passive := range passives {
desc.Members = append(desc.Members, address.Address(passive).Canonicalize())
}
for _, arbiter := range arbiters {
desc.Members = append(desc.Members, address.Address(arbiter).Canonicalize())
}
desc.Kind = Standalone
if isReplicaSet {
desc.Kind = RSGhost
} else if desc.SetName != "" {
if isMaster {
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 = &version
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
if rtt == UnsetRTT {
s.AverageRTTSet = false
} else {
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
}
// SelectServer selects this server if it is in the list of given candidates.
func (s Server) SelectServer(_ Topology, candidates []Server) ([]Server, error) {
for _, candidate := range candidates {
if candidate.Addr == s.Addr {
return []Server{candidate}, nil
}
}
return nil, nil
}
func decodeStringSlice(element bsoncore.Element, name string) ([]string, error) {
arr, ok := element.Value().ArrayOK()
if !ok {
return nil, fmt.Errorf("expected '%s' to be an array but it's a BSON %s", name, element.Value().Type)
}
vals, err := arr.Values()
if err != nil {
return nil, err
}
var strs []string
for _, val := range vals {
str, ok := val.StringValueOK()
if !ok {
return nil, fmt.Errorf("expected '%s' to be an array of strings, but found a BSON %s", name, val.Type)
}
strs = append(strs, str)
}
return strs, nil
}
func decodeStringMap(element bsoncore.Element, 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
}
// SupportsRetryWrites returns true if this description represents a server that supports retryable writes.
func (s Server) SupportsRetryWrites() bool {
return s.SessionTimeoutMinutes != 0 && s.Kind != Standalone
}