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client.go
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client.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 mongo
import (
"context"
"errors"
"fmt"
"net/http"
"time"
"go.mongodb.org/mongo-driver/bson"
"go.mongodb.org/mongo-driver/bson/bsoncodec"
"go.mongodb.org/mongo-driver/event"
"go.mongodb.org/mongo-driver/internal"
"go.mongodb.org/mongo-driver/internal/uuid"
"go.mongodb.org/mongo-driver/mongo/description"
"go.mongodb.org/mongo-driver/mongo/options"
"go.mongodb.org/mongo-driver/mongo/readconcern"
"go.mongodb.org/mongo-driver/mongo/readpref"
"go.mongodb.org/mongo-driver/mongo/writeconcern"
"go.mongodb.org/mongo-driver/x/bsonx/bsoncore"
"go.mongodb.org/mongo-driver/x/mongo/driver"
"go.mongodb.org/mongo-driver/x/mongo/driver/mongocrypt"
mcopts "go.mongodb.org/mongo-driver/x/mongo/driver/mongocrypt/options"
"go.mongodb.org/mongo-driver/x/mongo/driver/operation"
"go.mongodb.org/mongo-driver/x/mongo/driver/session"
"go.mongodb.org/mongo-driver/x/mongo/driver/topology"
)
const (
defaultLocalThreshold = 15 * time.Millisecond
defaultMaxPoolSize = 100
)
var (
// keyVaultCollOpts specifies options used to communicate with the key vault collection
keyVaultCollOpts = options.Collection().SetReadConcern(readconcern.Majority()).
SetWriteConcern(writeconcern.New(writeconcern.WMajority()))
endSessionsBatchSize = 10000
)
// Client is a handle representing a pool of connections to a MongoDB deployment. It is safe for concurrent use by
// multiple goroutines.
//
// The Client type opens and closes connections automatically and maintains a pool of idle connections. For
// connection pool configuration options, see documentation for the ClientOptions type in the mongo/options package.
type Client struct {
id uuid.UUID
deployment driver.Deployment
localThreshold time.Duration
retryWrites bool
retryReads bool
clock *session.ClusterClock
readPreference *readpref.ReadPref
readConcern *readconcern.ReadConcern
writeConcern *writeconcern.WriteConcern
registry *bsoncodec.Registry
monitor *event.CommandMonitor
serverAPI *driver.ServerAPIOptions
serverMonitor *event.ServerMonitor
sessionPool *session.Pool
timeout *time.Duration
httpClient *http.Client
// client-side encryption fields
keyVaultClientFLE *Client
keyVaultCollFLE *Collection
mongocryptdFLE *mongocryptdClient
cryptFLE driver.Crypt
metadataClientFLE *Client
internalClientFLE *Client
encryptedFieldsMap map[string]interface{}
}
// Connect creates a new Client and then initializes it using the Connect method. This is equivalent to calling
// NewClient followed by Client.Connect.
//
// When creating an options.ClientOptions, the order the methods are called matters. Later Set*
// methods will overwrite the values from previous Set* method invocations. This includes the
// ApplyURI method. This allows callers to determine the order of precedence for option
// application. For instance, if ApplyURI is called before SetAuth, the Credential from
// SetAuth will overwrite the values from the connection string. If ApplyURI is called
// after SetAuth, then its values will overwrite those from SetAuth.
//
// The opts parameter is processed using options.MergeClientOptions, which will overwrite entire
// option fields of previous options, there is no partial overwriting. For example, if Username is
// set in the Auth field for the first option, and Password is set for the second but with no
// Username, after the merge the Username field will be empty.
//
// The NewClient function does not do any I/O and returns an error if the given options are invalid.
// The Client.Connect method starts background goroutines to monitor the state of the deployment and does not do
// any I/O in the main goroutine to prevent the main goroutine from blocking. Therefore, it will not error if the
// deployment is down.
//
// The Client.Ping method can be used to verify that the deployment is successfully connected and the
// Client was correctly configured.
func Connect(ctx context.Context, opts ...*options.ClientOptions) (*Client, error) {
c, err := NewClient(opts...)
if err != nil {
return nil, err
}
err = c.Connect(ctx)
if err != nil {
return nil, err
}
return c, nil
}
// NewClient creates a new client to connect to a deployment specified by the uri.
//
// When creating an options.ClientOptions, the order the methods are called matters. Later Set*
// methods will overwrite the values from previous Set* method invocations. This includes the
// ApplyURI method. This allows callers to determine the order of precedence for option
// application. For instance, if ApplyURI is called before SetAuth, the Credential from
// SetAuth will overwrite the values from the connection string. If ApplyURI is called
// after SetAuth, then its values will overwrite those from SetAuth.
//
// The opts parameter is processed using options.MergeClientOptions, which will overwrite entire
// option fields of previous options, there is no partial overwriting. For example, if Username is
// set in the Auth field for the first option, and Password is set for the second but with no
// Username, after the merge the Username field will be empty.
func NewClient(opts ...*options.ClientOptions) (*Client, error) {
clientOpt := options.MergeClientOptions(opts...)
id, err := uuid.New()
if err != nil {
return nil, err
}
client := &Client{id: id}
// ClusterClock
client.clock = new(session.ClusterClock)
// LocalThreshold
client.localThreshold = defaultLocalThreshold
if clientOpt.LocalThreshold != nil {
client.localThreshold = *clientOpt.LocalThreshold
}
// Monitor
if clientOpt.Monitor != nil {
client.monitor = clientOpt.Monitor
}
// ServerMonitor
if clientOpt.ServerMonitor != nil {
client.serverMonitor = clientOpt.ServerMonitor
}
// ReadConcern
client.readConcern = readconcern.New()
if clientOpt.ReadConcern != nil {
client.readConcern = clientOpt.ReadConcern
}
// ReadPreference
client.readPreference = readpref.Primary()
if clientOpt.ReadPreference != nil {
client.readPreference = clientOpt.ReadPreference
}
// Registry
client.registry = bson.DefaultRegistry
if clientOpt.Registry != nil {
client.registry = clientOpt.Registry
}
// RetryWrites
client.retryWrites = true // retry writes on by default
if clientOpt.RetryWrites != nil {
client.retryWrites = *clientOpt.RetryWrites
}
client.retryReads = true
if clientOpt.RetryReads != nil {
client.retryReads = *clientOpt.RetryReads
}
// Timeout
client.timeout = clientOpt.Timeout
client.httpClient = clientOpt.HTTPClient
// WriteConcern
if clientOpt.WriteConcern != nil {
client.writeConcern = clientOpt.WriteConcern
}
// AutoEncryptionOptions
if clientOpt.AutoEncryptionOptions != nil {
if err := client.configureAutoEncryption(clientOpt); err != nil {
return nil, err
}
} else {
client.cryptFLE = clientOpt.Crypt
}
// Deployment
if clientOpt.Deployment != nil {
client.deployment = clientOpt.Deployment
}
// Set default options
if clientOpt.MaxPoolSize == nil {
clientOpt.SetMaxPoolSize(defaultMaxPoolSize)
}
if err != nil {
return nil, err
}
cfg, err := topology.NewConfig(clientOpt, client.clock)
if err != nil {
return nil, err
}
client.serverAPI = topology.ServerAPIFromServerOptions(cfg.ServerOpts)
if client.deployment == nil {
client.deployment, err = topology.New(cfg)
if err != nil {
return nil, replaceErrors(err)
}
}
return client, nil
}
// Connect initializes the Client by starting background monitoring goroutines.
// If the Client was created using the NewClient function, this method must be called before a Client can be used.
//
// Connect starts background goroutines to monitor the state of the deployment and does not do any I/O in the main
// goroutine. The Client.Ping method can be used to verify that the connection was created successfully.
func (c *Client) Connect(ctx context.Context) error {
if connector, ok := c.deployment.(driver.Connector); ok {
err := connector.Connect()
if err != nil {
return replaceErrors(err)
}
}
if c.mongocryptdFLE != nil {
if err := c.mongocryptdFLE.connect(ctx); err != nil {
return err
}
}
if c.internalClientFLE != nil {
if err := c.internalClientFLE.Connect(ctx); err != nil {
return err
}
}
if c.keyVaultClientFLE != nil && c.keyVaultClientFLE != c.internalClientFLE && c.keyVaultClientFLE != c {
if err := c.keyVaultClientFLE.Connect(ctx); err != nil {
return err
}
}
if c.metadataClientFLE != nil && c.metadataClientFLE != c.internalClientFLE && c.metadataClientFLE != c {
if err := c.metadataClientFLE.Connect(ctx); err != nil {
return err
}
}
var updateChan <-chan description.Topology
if subscriber, ok := c.deployment.(driver.Subscriber); ok {
sub, err := subscriber.Subscribe()
if err != nil {
return replaceErrors(err)
}
updateChan = sub.Updates
}
c.sessionPool = session.NewPool(updateChan)
return nil
}
// Disconnect closes sockets to the topology referenced by this Client. It will
// shut down any monitoring goroutines, close the idle connection pool, and will
// wait until all the in use connections have been returned to the connection
// pool and closed before returning. If the context expires via cancellation,
// deadline, or timeout before the in use connections have returned, the in use
// connections will be closed, resulting in the failure of any in flight read
// or write operations. If this method returns with no errors, all connections
// associated with this Client have been closed.
func (c *Client) Disconnect(ctx context.Context) error {
if ctx == nil {
ctx = context.Background()
}
if c.httpClient == internal.DefaultHTTPClient {
defer internal.CloseIdleHTTPConnections(c.httpClient)
}
c.endSessions(ctx)
if c.mongocryptdFLE != nil {
if err := c.mongocryptdFLE.disconnect(ctx); err != nil {
return err
}
}
if c.internalClientFLE != nil {
if err := c.internalClientFLE.Disconnect(ctx); err != nil {
return err
}
}
if c.keyVaultClientFLE != nil && c.keyVaultClientFLE != c.internalClientFLE && c.keyVaultClientFLE != c {
if err := c.keyVaultClientFLE.Disconnect(ctx); err != nil {
return err
}
}
if c.metadataClientFLE != nil && c.metadataClientFLE != c.internalClientFLE && c.metadataClientFLE != c {
if err := c.metadataClientFLE.Disconnect(ctx); err != nil {
return err
}
}
if c.cryptFLE != nil {
c.cryptFLE.Close()
}
if disconnector, ok := c.deployment.(driver.Disconnector); ok {
return replaceErrors(disconnector.Disconnect(ctx))
}
return nil
}
// Ping sends a ping command to verify that the client can connect to the deployment.
//
// The rp parameter is used to determine which server is selected for the operation.
// If it is nil, the client's read preference is used.
//
// If the server is down, Ping will try to select a server until the client's server selection timeout expires.
// This can be configured through the ClientOptions.SetServerSelectionTimeout option when creating a new Client.
// After the timeout expires, a server selection error is returned.
//
// Using Ping reduces application resilience because applications starting up will error if the server is temporarily
// unavailable or is failing over (e.g. during autoscaling due to a load spike).
func (c *Client) Ping(ctx context.Context, rp *readpref.ReadPref) error {
if ctx == nil {
ctx = context.Background()
}
if rp == nil {
rp = c.readPreference
}
db := c.Database("admin")
res := db.RunCommand(ctx, bson.D{
{"ping", 1},
}, options.RunCmd().SetReadPreference(rp))
return replaceErrors(res.Err())
}
// StartSession starts a new session configured with the given options.
//
// StartSession does not actually communicate with the server and will not error if the client is
// disconnected.
//
// StartSession is safe to call from multiple goroutines concurrently. However, Sessions returned by StartSession are
// not safe for concurrent use by multiple goroutines.
//
// If the DefaultReadConcern, DefaultWriteConcern, or DefaultReadPreference options are not set, the client's read
// concern, write concern, or read preference will be used, respectively.
func (c *Client) StartSession(opts ...*options.SessionOptions) (Session, error) {
if c.sessionPool == nil {
return nil, ErrClientDisconnected
}
sopts := options.MergeSessionOptions(opts...)
coreOpts := &session.ClientOptions{
DefaultReadConcern: c.readConcern,
DefaultReadPreference: c.readPreference,
DefaultWriteConcern: c.writeConcern,
}
if sopts.CausalConsistency != nil {
coreOpts.CausalConsistency = sopts.CausalConsistency
}
if sopts.DefaultReadConcern != nil {
coreOpts.DefaultReadConcern = sopts.DefaultReadConcern
}
if sopts.DefaultWriteConcern != nil {
coreOpts.DefaultWriteConcern = sopts.DefaultWriteConcern
}
if sopts.DefaultReadPreference != nil {
coreOpts.DefaultReadPreference = sopts.DefaultReadPreference
}
if sopts.DefaultMaxCommitTime != nil {
coreOpts.DefaultMaxCommitTime = sopts.DefaultMaxCommitTime
}
if sopts.Snapshot != nil {
coreOpts.Snapshot = sopts.Snapshot
}
sess, err := session.NewClientSession(c.sessionPool, c.id, coreOpts)
if err != nil {
return nil, replaceErrors(err)
}
// Writes are not retryable on standalones, so let operation determine whether to retry
sess.RetryWrite = false
sess.RetryRead = c.retryReads
return &sessionImpl{
clientSession: sess,
client: c,
deployment: c.deployment,
}, nil
}
func (c *Client) endSessions(ctx context.Context) {
if c.sessionPool == nil {
return
}
sessionIDs := c.sessionPool.IDSlice()
op := operation.NewEndSessions(nil).ClusterClock(c.clock).Deployment(c.deployment).
ServerSelector(description.ReadPrefSelector(readpref.PrimaryPreferred())).CommandMonitor(c.monitor).
Database("admin").Crypt(c.cryptFLE).ServerAPI(c.serverAPI)
totalNumIDs := len(sessionIDs)
var currentBatch []bsoncore.Document
for i := 0; i < totalNumIDs; i++ {
currentBatch = append(currentBatch, sessionIDs[i])
// If we are at the end of a batch or the end of the overall IDs array, execute the operation.
if ((i+1)%endSessionsBatchSize) == 0 || i == totalNumIDs-1 {
// Ignore all errors when ending sessions.
_, marshalVal, err := bson.MarshalValue(currentBatch)
if err == nil {
_ = op.SessionIDs(marshalVal).Execute(ctx)
}
currentBatch = currentBatch[:0]
}
}
}
func (c *Client) configureAutoEncryption(clientOpts *options.ClientOptions) error {
c.encryptedFieldsMap = clientOpts.AutoEncryptionOptions.EncryptedFieldsMap
if err := c.configureKeyVaultClientFLE(clientOpts); err != nil {
return err
}
if err := c.configureMetadataClientFLE(clientOpts); err != nil {
return err
}
mc, err := c.newMongoCrypt(clientOpts.AutoEncryptionOptions)
if err != nil {
return err
}
// If the crypt_shared library was loaded successfully, signal to the mongocryptd client creator
// that it can bypass spawning mongocryptd.
cryptSharedLibAvailable := mc.CryptSharedLibVersionString() != ""
mongocryptdFLE, err := newMongocryptdClient(cryptSharedLibAvailable, clientOpts.AutoEncryptionOptions)
if err != nil {
return err
}
c.mongocryptdFLE = mongocryptdFLE
c.configureCryptFLE(mc, clientOpts.AutoEncryptionOptions)
return nil
}
func (c *Client) getOrCreateInternalClient(clientOpts *options.ClientOptions) (*Client, error) {
if c.internalClientFLE != nil {
return c.internalClientFLE, nil
}
internalClientOpts := options.MergeClientOptions(clientOpts)
internalClientOpts.AutoEncryptionOptions = nil
internalClientOpts.SetMinPoolSize(0)
var err error
c.internalClientFLE, err = NewClient(internalClientOpts)
return c.internalClientFLE, err
}
func (c *Client) configureKeyVaultClientFLE(clientOpts *options.ClientOptions) error {
// parse key vault options and create new key vault client
var err error
aeOpts := clientOpts.AutoEncryptionOptions
switch {
case aeOpts.KeyVaultClientOptions != nil:
c.keyVaultClientFLE, err = NewClient(aeOpts.KeyVaultClientOptions)
case clientOpts.MaxPoolSize != nil && *clientOpts.MaxPoolSize == 0:
c.keyVaultClientFLE = c
default:
c.keyVaultClientFLE, err = c.getOrCreateInternalClient(clientOpts)
}
if err != nil {
return err
}
dbName, collName := splitNamespace(aeOpts.KeyVaultNamespace)
c.keyVaultCollFLE = c.keyVaultClientFLE.Database(dbName).Collection(collName, keyVaultCollOpts)
return nil
}
func (c *Client) configureMetadataClientFLE(clientOpts *options.ClientOptions) error {
// parse key vault options and create new key vault client
aeOpts := clientOpts.AutoEncryptionOptions
if aeOpts.BypassAutoEncryption != nil && *aeOpts.BypassAutoEncryption {
// no need for a metadata client.
return nil
}
if clientOpts.MaxPoolSize != nil && *clientOpts.MaxPoolSize == 0 {
c.metadataClientFLE = c
return nil
}
var err error
c.metadataClientFLE, err = c.getOrCreateInternalClient(clientOpts)
return err
}
func (c *Client) newMongoCrypt(opts *options.AutoEncryptionOptions) (*mongocrypt.MongoCrypt, error) {
// convert schemas in SchemaMap to bsoncore documents
cryptSchemaMap := make(map[string]bsoncore.Document)
for k, v := range opts.SchemaMap {
schema, err := transformBsoncoreDocument(c.registry, v, true, "schemaMap")
if err != nil {
return nil, err
}
cryptSchemaMap[k] = schema
}
// convert schemas in EncryptedFieldsMap to bsoncore documents
cryptEncryptedFieldsMap := make(map[string]bsoncore.Document)
for k, v := range opts.EncryptedFieldsMap {
encryptedFields, err := transformBsoncoreDocument(c.registry, v, true, "encryptedFieldsMap")
if err != nil {
return nil, err
}
cryptEncryptedFieldsMap[k] = encryptedFields
}
kmsProviders, err := transformBsoncoreDocument(c.registry, opts.KmsProviders, true, "kmsProviders")
if err != nil {
return nil, fmt.Errorf("error creating KMS providers document: %v", err)
}
// Set the crypt_shared library override path from the "cryptSharedLibPath" extra option if one
// was set.
cryptSharedLibPath := ""
if val, ok := opts.ExtraOptions["cryptSharedLibPath"]; ok {
str, ok := val.(string)
if !ok {
return nil, fmt.Errorf(
`expected AutoEncryption extra option "cryptSharedLibPath" to be a string, but is a %T`, val)
}
cryptSharedLibPath = str
}
// Explicitly disable loading the crypt_shared library if requested. Note that this is ONLY
// intended for use from tests; there is no supported public API for explicitly disabling
// loading the crypt_shared library.
cryptSharedLibDisabled := false
if v, ok := opts.ExtraOptions["__cryptSharedLibDisabledForTestOnly"]; ok {
cryptSharedLibDisabled = v.(bool)
}
bypassAutoEncryption := opts.BypassAutoEncryption != nil && *opts.BypassAutoEncryption
bypassQueryAnalysis := opts.BypassQueryAnalysis != nil && *opts.BypassQueryAnalysis
mc, err := mongocrypt.NewMongoCrypt(mcopts.MongoCrypt().
SetKmsProviders(kmsProviders).
SetLocalSchemaMap(cryptSchemaMap).
SetBypassQueryAnalysis(bypassQueryAnalysis).
SetEncryptedFieldsMap(cryptEncryptedFieldsMap).
SetCryptSharedLibDisabled(cryptSharedLibDisabled || bypassAutoEncryption).
SetCryptSharedLibOverridePath(cryptSharedLibPath))
if err != nil {
return nil, err
}
var cryptSharedLibRequired bool
if val, ok := opts.ExtraOptions["cryptSharedLibRequired"]; ok {
b, ok := val.(bool)
if !ok {
return nil, fmt.Errorf(
`expected AutoEncryption extra option "cryptSharedLibRequired" to be a bool, but is a %T`, val)
}
cryptSharedLibRequired = b
}
// If the "cryptSharedLibRequired" extra option is set to true, check the MongoCrypt version
// string to confirm that the library was successfully loaded. If the version string is empty,
// return an error indicating that we couldn't load the crypt_shared library.
if cryptSharedLibRequired && mc.CryptSharedLibVersionString() == "" {
return nil, errors.New(
`AutoEncryption extra option "cryptSharedLibRequired" is true, but we failed to load the crypt_shared library`)
}
return mc, nil
}
//nolint:unused // the unused linter thinks that this function is unreachable because "c.newMongoCrypt" always panics without the "cse" build tag set.
func (c *Client) configureCryptFLE(mc *mongocrypt.MongoCrypt, opts *options.AutoEncryptionOptions) {
bypass := opts.BypassAutoEncryption != nil && *opts.BypassAutoEncryption
kr := keyRetriever{coll: c.keyVaultCollFLE}
var cir collInfoRetriever
// If bypass is true, c.metadataClientFLE is nil and the collInfoRetriever
// will not be used. If bypass is false, to the parent client or the
// internal client.
if !bypass {
cir = collInfoRetriever{client: c.metadataClientFLE}
}
c.cryptFLE = driver.NewCrypt(&driver.CryptOptions{
MongoCrypt: mc,
CollInfoFn: cir.cryptCollInfo,
KeyFn: kr.cryptKeys,
MarkFn: c.mongocryptdFLE.markCommand,
TLSConfig: opts.TLSConfig,
HTTPClient: opts.HTTPClient,
BypassAutoEncryption: bypass,
})
}
// validSession returns an error if the session doesn't belong to the client
func (c *Client) validSession(sess *session.Client) error {
if sess != nil && sess.ClientID != c.id {
return ErrWrongClient
}
return nil
}
// Database returns a handle for a database with the given name configured with the given DatabaseOptions.
func (c *Client) Database(name string, opts ...*options.DatabaseOptions) *Database {
return newDatabase(c, name, opts...)
}
// ListDatabases executes a listDatabases command and returns the result.
//
// The filter parameter must be a document containing query operators and can be used to select which
// databases are included in the result. It cannot be nil. An empty document (e.g. bson.D{}) should be used to include
// all databases.
//
// The opts parameter can be used to specify options for this operation (see the options.ListDatabasesOptions documentation).
//
// For more information about the command, see https://www.mongodb.com/docs/manual/reference/command/listDatabases/.
func (c *Client) ListDatabases(ctx context.Context, filter interface{}, opts ...*options.ListDatabasesOptions) (ListDatabasesResult, error) {
if ctx == nil {
ctx = context.Background()
}
sess := sessionFromContext(ctx)
err := c.validSession(sess)
if err != nil {
return ListDatabasesResult{}, err
}
if sess == nil && c.sessionPool != nil {
sess = session.NewImplicitClientSession(c.sessionPool, c.id)
defer sess.EndSession()
}
err = c.validSession(sess)
if err != nil {
return ListDatabasesResult{}, err
}
filterDoc, err := transformBsoncoreDocument(c.registry, filter, true, "filter")
if err != nil {
return ListDatabasesResult{}, err
}
selector := description.CompositeSelector([]description.ServerSelector{
description.ReadPrefSelector(readpref.Primary()),
description.LatencySelector(c.localThreshold),
})
selector = makeReadPrefSelector(sess, selector, c.localThreshold)
ldo := options.MergeListDatabasesOptions(opts...)
op := operation.NewListDatabases(filterDoc).
Session(sess).ReadPreference(c.readPreference).CommandMonitor(c.monitor).
ServerSelector(selector).ClusterClock(c.clock).Database("admin").Deployment(c.deployment).Crypt(c.cryptFLE).
ServerAPI(c.serverAPI).Timeout(c.timeout)
if ldo.NameOnly != nil {
op = op.NameOnly(*ldo.NameOnly)
}
if ldo.AuthorizedDatabases != nil {
op = op.AuthorizedDatabases(*ldo.AuthorizedDatabases)
}
retry := driver.RetryNone
if c.retryReads {
retry = driver.RetryOncePerCommand
}
op.Retry(retry)
err = op.Execute(ctx)
if err != nil {
return ListDatabasesResult{}, replaceErrors(err)
}
return newListDatabasesResultFromOperation(op.Result()), nil
}
// ListDatabaseNames executes a listDatabases command and returns a slice containing the names of all of the databases
// on the server.
//
// The filter parameter must be a document containing query operators and can be used to select which databases
// are included in the result. It cannot be nil. An empty document (e.g. bson.D{}) should be used to include all
// databases.
//
// The opts parameter can be used to specify options for this operation (see the options.ListDatabasesOptions
// documentation.)
//
// For more information about the command, see https://www.mongodb.com/docs/manual/reference/command/listDatabases/.
func (c *Client) ListDatabaseNames(ctx context.Context, filter interface{}, opts ...*options.ListDatabasesOptions) ([]string, error) {
opts = append(opts, options.ListDatabases().SetNameOnly(true))
res, err := c.ListDatabases(ctx, filter, opts...)
if err != nil {
return nil, err
}
names := make([]string, 0)
for _, spec := range res.Databases {
names = append(names, spec.Name)
}
return names, nil
}
// WithSession creates a new SessionContext from the ctx and sess parameters and uses it to call the fn callback. The
// SessionContext must be used as the Context parameter for any operations in the fn callback that should be executed
// under the session.
//
// WithSession is safe to call from multiple goroutines concurrently. However, the SessionContext passed to the
// WithSession callback function is not safe for concurrent use by multiple goroutines.
//
// If the ctx parameter already contains a Session, that Session will be replaced with the one provided.
//
// Any error returned by the fn callback will be returned without any modifications.
func WithSession(ctx context.Context, sess Session, fn func(SessionContext) error) error {
return fn(NewSessionContext(ctx, sess))
}
// UseSession creates a new Session and uses it to create a new SessionContext, which is used to call the fn callback.
// The SessionContext parameter must be used as the Context parameter for any operations in the fn callback that should
// be executed under a session. After the callback returns, the created Session is ended, meaning that any in-progress
// transactions started by fn will be aborted even if fn returns an error.
//
// UseSession is safe to call from multiple goroutines concurrently. However, the SessionContext passed to the
// UseSession callback function is not safe for concurrent use by multiple goroutines.
//
// If the ctx parameter already contains a Session, that Session will be replaced with the newly created one.
//
// Any error returned by the fn callback will be returned without any modifications.
func (c *Client) UseSession(ctx context.Context, fn func(SessionContext) error) error {
return c.UseSessionWithOptions(ctx, options.Session(), fn)
}
// UseSessionWithOptions operates like UseSession but uses the given SessionOptions to create the Session.
//
// UseSessionWithOptions is safe to call from multiple goroutines concurrently. However, the SessionContext passed to
// the UseSessionWithOptions callback function is not safe for concurrent use by multiple goroutines.
func (c *Client) UseSessionWithOptions(ctx context.Context, opts *options.SessionOptions, fn func(SessionContext) error) error {
defaultSess, err := c.StartSession(opts)
if err != nil {
return err
}
defer defaultSess.EndSession(ctx)
return fn(NewSessionContext(ctx, defaultSess))
}
// Watch returns a change stream for all changes on the deployment. See
// https://www.mongodb.com/docs/manual/changeStreams/ for more information about change streams.
//
// The client must be configured with read concern majority or no read concern for a change stream to be created
// successfully.
//
// The pipeline parameter must be an array of documents, each representing a pipeline stage. The pipeline cannot be
// nil or empty. The stage documents must all be non-nil. See https://www.mongodb.com/docs/manual/changeStreams/ for a list
// of pipeline stages that can be used with change streams. For a pipeline of bson.D documents, the mongo.Pipeline{}
// type can be used.
//
// The opts parameter can be used to specify options for change stream creation (see the options.ChangeStreamOptions
// documentation).
func (c *Client) Watch(ctx context.Context, pipeline interface{},
opts ...*options.ChangeStreamOptions) (*ChangeStream, error) {
if c.sessionPool == nil {
return nil, ErrClientDisconnected
}
csConfig := changeStreamConfig{
readConcern: c.readConcern,
readPreference: c.readPreference,
client: c,
registry: c.registry,
streamType: ClientStream,
crypt: c.cryptFLE,
}
return newChangeStream(ctx, csConfig, pipeline, opts...)
}
// NumberSessionsInProgress returns the number of sessions that have been started for this client but have not been
// closed (i.e. EndSession has not been called).
func (c *Client) NumberSessionsInProgress() int {
// The underlying session pool uses an int64 for checkedOut to allow atomic
// access. We convert to an int here to maintain backward compatibility with
// older versions of the driver that did not atomically access checkedOut.
return int(c.sessionPool.CheckedOut())
}
// Timeout returns the timeout set for this client.
func (c *Client) Timeout() *time.Duration {
return c.timeout
}
func (c *Client) createBaseCursorOptions() driver.CursorOptions {
return driver.CursorOptions{
CommandMonitor: c.monitor,
Crypt: c.cryptFLE,
ServerAPI: c.serverAPI,
}
}