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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 (
"fmt"
"time"
"github.com/mongodb/mongo-go-driver/bson/objectid"
"github.com/mongodb/mongo-go-driver/core/address"
"github.com/mongodb/mongo-go-driver/core/result"
"github.com/mongodb/mongo-go-driver/core/tag"
)
// 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 objectid.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
Tags tag.Set
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, isMaster result.IsMaster) Server {
i := Server{
Addr: addr,
CanonicalAddr: address.Address(isMaster.Me).Canonicalize(),
Compression: isMaster.Compression,
ElectionID: isMaster.ElectionID,
LastUpdateTime: time.Now().UTC(),
LastWriteTime: isMaster.LastWriteTimestamp,
MaxBatchCount: isMaster.MaxWriteBatchSize,
MaxDocumentSize: isMaster.MaxBSONObjectSize,
MaxMessageSize: isMaster.MaxMessageSizeBytes,
SaslSupportedMechs: isMaster.SaslSupportedMechs,
SessionTimeoutMinutes: isMaster.LogicalSessionTimeoutMinutes,
SetName: isMaster.SetName,
SetVersion: isMaster.SetVersion,
Tags: tag.NewTagSetFromMap(isMaster.Tags),
}
if i.CanonicalAddr == "" {
i.CanonicalAddr = addr
}
if isMaster.OK != 1 {
i.LastError = fmt.Errorf("not ok")
return i
}
for _, host := range isMaster.Hosts {
i.Members = append(i.Members, address.Address(host).Canonicalize())
}
for _, passive := range isMaster.Passives {
i.Members = append(i.Members, address.Address(passive).Canonicalize())
}
for _, arbiter := range isMaster.Arbiters {
i.Members = append(i.Members, address.Address(arbiter).Canonicalize())
}
i.Kind = Standalone
if isMaster.IsReplicaSet {
i.Kind = RSGhost
} else if isMaster.SetName != "" {
if isMaster.IsMaster {
i.Kind = RSPrimary
} else if isMaster.Hidden {
i.Kind = RSMember
} else if isMaster.Secondary {
i.Kind = RSSecondary
} else if isMaster.ArbiterOnly {
i.Kind = RSArbiter
} else {
i.Kind = RSMember
}
} else if isMaster.Msg == "isdbgrid" {
i.Kind = Mongos
}
i.WireVersion = &VersionRange{
Min: isMaster.MinWireVersion,
Max: isMaster.MaxWireVersion,
}
return i
}
// 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
}