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