/
ismaster.go
263 lines (227 loc) · 8.52 KB
/
ismaster.go
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package operation
import (
"context"
"errors"
"fmt"
"runtime"
"strconv"
"go.mongodb.org/mongo-driver/bson"
"go.mongodb.org/mongo-driver/internal"
"go.mongodb.org/mongo-driver/mongo/address"
"go.mongodb.org/mongo-driver/mongo/description"
"go.mongodb.org/mongo-driver/version"
"go.mongodb.org/mongo-driver/x/bsonx/bsoncore"
"go.mongodb.org/mongo-driver/x/mongo/driver"
"go.mongodb.org/mongo-driver/x/mongo/driver/session"
)
// IsMaster is used to run the isMaster handshake operation.
type IsMaster struct {
appname string
compressors []string
saslSupportedMechs string
d driver.Deployment
clock *session.ClusterClock
speculativeAuth bsoncore.Document
topologyVersion *description.TopologyVersion
maxAwaitTimeMS *int64
res bsoncore.Document
}
var _ driver.Handshaker = (*IsMaster)(nil)
// NewIsMaster constructs an IsMaster.
func NewIsMaster() *IsMaster { return &IsMaster{} }
// AppName sets the application name in the client metadata sent in this operation.
func (im *IsMaster) AppName(appname string) *IsMaster {
im.appname = appname
return im
}
// ClusterClock sets the cluster clock for this operation.
func (im *IsMaster) ClusterClock(clock *session.ClusterClock) *IsMaster {
if im == nil {
im = new(IsMaster)
}
im.clock = clock
return im
}
// Compressors sets the compressors that can be used.
func (im *IsMaster) Compressors(compressors []string) *IsMaster {
im.compressors = compressors
return im
}
// SASLSupportedMechs retrieves the supported SASL mechanism for the given user when this operation
// is run.
func (im *IsMaster) SASLSupportedMechs(username string) *IsMaster {
im.saslSupportedMechs = username
return im
}
// Deployment sets the Deployment for this operation.
func (im *IsMaster) Deployment(d driver.Deployment) *IsMaster {
im.d = d
return im
}
// SpeculativeAuthenticate sets the document to be used for speculative authentication.
func (im *IsMaster) SpeculativeAuthenticate(doc bsoncore.Document) *IsMaster {
im.speculativeAuth = doc
return im
}
// TopologyVersion sets the TopologyVersion to be used for heartbeats.
func (im *IsMaster) TopologyVersion(tv *description.TopologyVersion) *IsMaster {
im.topologyVersion = tv
return im
}
// MaxAwaitTimeMS sets the maximum time for the sever to wait for topology changes during a heartbeat.
func (im *IsMaster) MaxAwaitTimeMS(awaitTime int64) *IsMaster {
im.maxAwaitTimeMS = &awaitTime
return im
}
// Result returns the result of executing this operation.
func (im *IsMaster) Result(addr address.Address) description.Server {
return description.NewServer(addr, bson.Raw(im.res))
}
func (im *IsMaster) 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 (im *IsMaster) 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
}
// handshakeCommand appends all necessary command fields as well as client metadata, SASL supported mechs, and compression.
func (im *IsMaster) handshakeCommand(dst []byte, desc description.SelectedServer) ([]byte, error) {
dst, err := im.command(dst, desc)
if err != nil {
return dst, err
}
if im.saslSupportedMechs != "" {
dst = bsoncore.AppendStringElement(dst, "saslSupportedMechs", im.saslSupportedMechs)
}
if im.speculativeAuth != nil {
dst = bsoncore.AppendDocumentElement(dst, "speculativeAuthenticate", im.speculativeAuth)
}
var idx int32
idx, dst = bsoncore.AppendArrayElementStart(dst, "compression")
for i, compressor := range im.compressors {
dst = bsoncore.AppendStringElement(dst, strconv.Itoa(i), compressor)
}
dst, _ = bsoncore.AppendArrayEnd(dst, idx)
// append client metadata
idx, dst = bsoncore.AppendDocumentElementStart(dst, "client")
didx, dst := bsoncore.AppendDocumentElementStart(dst, "driver")
dst = bsoncore.AppendStringElement(dst, "name", "mongo-go-driver")
dst = bsoncore.AppendStringElement(dst, "version", version.Driver)
dst, _ = bsoncore.AppendDocumentEnd(dst, didx)
didx, dst = bsoncore.AppendDocumentElementStart(dst, "os")
dst = bsoncore.AppendStringElement(dst, "type", runtime.GOOS)
dst = bsoncore.AppendStringElement(dst, "architecture", runtime.GOARCH)
dst, _ = bsoncore.AppendDocumentEnd(dst, didx)
dst = bsoncore.AppendStringElement(dst, "platform", runtime.Version())
if im.appname != "" {
didx, dst = bsoncore.AppendDocumentElementStart(dst, "application")
dst = bsoncore.AppendStringElement(dst, "name", im.appname)
dst, _ = bsoncore.AppendDocumentEnd(dst, didx)
}
dst, _ = bsoncore.AppendDocumentEnd(dst, idx)
return dst, nil
}
// command appends all necessary command fields.
func (im *IsMaster) command(dst []byte, _ description.SelectedServer) ([]byte, error) {
dst = bsoncore.AppendInt32Element(dst, "isMaster", 1)
if tv := im.topologyVersion; tv != nil {
var tvIdx int32
tvIdx, dst = bsoncore.AppendDocumentElementStart(dst, "topologyVersion")
dst = bsoncore.AppendObjectIDElement(dst, "processId", tv.ProcessID)
dst = bsoncore.AppendInt64Element(dst, "counter", tv.Counter)
dst, _ = bsoncore.AppendDocumentEnd(dst, tvIdx)
}
if im.maxAwaitTimeMS != nil {
dst = bsoncore.AppendInt64Element(dst, "maxAwaitTimeMS", *im.maxAwaitTimeMS)
}
return dst, nil
}
// Execute runs this operation.
func (im *IsMaster) Execute(ctx context.Context) error {
if im.d == nil {
return errors.New("an IsMaster must have a Deployment set before Execute can be called")
}
return im.createOperation().Execute(ctx, nil)
}
// StreamResponse gets the next streaming isMaster response from the server.
func (im *IsMaster) StreamResponse(ctx context.Context, conn driver.StreamerConnection) error {
return im.createOperation().ExecuteExhaust(ctx, conn, nil)
}
func (im *IsMaster) createOperation() driver.Operation {
return driver.Operation{
Clock: im.clock,
CommandFn: im.command,
Database: "admin",
Deployment: im.d,
ProcessResponseFn: func(response bsoncore.Document, _ driver.Server, _ description.Server, _ int) error {
im.res = response
return nil
},
}
}
// GetHandshakeInformation performs the MongoDB handshake for the provided connection and returns the relevant
// information about the server. This function implements the driver.Handshaker interface.
func (im *IsMaster) GetHandshakeInformation(ctx context.Context, _ address.Address, c driver.Connection) (driver.HandshakeInformation, error) {
err := driver.Operation{
Clock: im.clock,
CommandFn: im.handshakeCommand,
Deployment: driver.SingleConnectionDeployment{c},
Database: "admin",
ProcessResponseFn: func(response bsoncore.Document, _ driver.Server, _ description.Server, _ int) error {
im.res = response
return nil
},
}.Execute(ctx, nil)
if err != nil {
return driver.HandshakeInformation{}, err
}
info := driver.HandshakeInformation{
Description: im.Result(c.Address()),
}
if speculativeAuthenticate, ok := im.res.Lookup("speculativeAuthenticate").DocumentOK(); ok {
info.SpeculativeAuthenticate = speculativeAuthenticate
}
// Cast to bson.Raw to lookup saslSupportedMechs to avoid converting from bsoncore.Value to bson.RawValue for the
// StringSliceFromRawValue call.
if saslSupportedMechs, lookupErr := bson.Raw(im.res).LookupErr("saslSupportedMechs"); lookupErr == nil {
info.SaslSupportedMechs, err = internal.StringSliceFromRawValue("saslSupportedMechs", saslSupportedMechs)
}
return info, err
}
// FinishHandshake implements the Handshaker interface. This is a no-op function because a non-authenticated connection
// does not do anything besides the initial isMaster for a handshake.
func (im *IsMaster) FinishHandshake(context.Context, driver.Connection) error {
return nil
}