mongo-go-driver的clientOptions的默认值是什么？

Question

我正在尝试搜索mongo-go-driver的clientOptions的默认值。

我正在尝试通过以下方式启动新的客户端：

        opts := options.ClientOptions{}
    opts.ApplyURI(connectionURI)
    sharedConnection, err = mongo.NewClient(&opts)

我想知道像ConnectTimeout，MaxPoolSize，MaxConnIdleTime这样的clientOptions的默认值是多少。

   type ClientOptions struct {
    ConnectTimeout         *time.Duration
    Compressors            []string
    Dialer                 ContextDialer
    HeartbeatInterval      *time.Duration
    LocalThreshold         *time.Duration
    MaxConnIdleTime        *time.Duration
    MaxPoolSize            *uint16
    Monitor                *event.CommandMonitor
    ReadConcern            *readconcern.ReadConcern
    ReadPreference         *readpref.ReadPref
    Registry               *bsoncodec.Registry
    RetryWrites            *bool
    ServerSelectionTimeout *time.Duration
    Direct                 *bool
    SocketTimeout          *time.Duration
    TLSConfig              *tls.Config
    WriteConcern           *writeconcern.WriteConcern
    ZlibLevel              *int
   }

Answer 1

以下默认值基于mongo-go-driver v1.1.x和MongoDB server v4.2。你还可以在MongoDB driver specs上找到更多信息/行为。

ConnectTimeout         30 * time.Second
Compressors            nil (compression will not be used)
Dialer                 net.Dialer with a 300 second keepalive time
HeartbeatInterval      10 * time.Second
LocalThreshold         15 * time.Millisecond
MaxConnIdleTime        nil (no limit)
MaxPoolSize            100
Monitor                nil
ReadConcern            nil (server default `local`)
ReadPreference         readpref.Primary()
Registry               bson.DefaultRegistry
RetryWrites            true
ServerSelectionTimeout 30 * time.Second
Direct                 false
SocketTimeout          nil (infinite)
TLSConfig              nil
WriteConcern           nil (server default `w:1`)
ZlibLevel              6 (if zlib compression enabled)

Answer 2

如果没有流来设置默认值，那么它将设置为零值。零值是指声明变量且未显式初始化时，将使用默认值为其分配存储空间

1. ConnectTimeout --> 0
2. MaxConnIdleTime，数据类型默认值=0sb.
3. MaxPoolSize --> uint16，数据类型默认值=0
4. MaxConnIdleTime --> time.Duration，数据类型默认值= 0s

另一个：

1. bool -->默认值为false
2. string -->默认值为""
3. int ->默认值为0