github.com/bingoohuang/gg@v0.0.0-20240325092523-45da7dee9335/pkg/snow/default.go (about)

     1  package snow
     2  
     3  import "time"
     4  
     5  // DefaultNode is the global default snowflake node object.
     6  // nolint gochecknoglobals
     7  var DefaultNode, _ = NewNode()
     8  
     9  // GetOption return the option.
    10  func GetOption() Option { return DefaultNode.option }
    11  
    12  // GetEpoch returns an int64 epoch is snowflake epoch in milliseconds.
    13  func GetEpoch() int64 { return DefaultNode.epoch }
    14  
    15  // GetTime returns an int64 unix timestamp in milliseconds of the snowflake ID time.
    16  func GetTime() int64 { return DefaultNode.time }
    17  
    18  // GetNodeID returns an int64 of the snowflake ID node number
    19  func GetNodeID() int64 { return DefaultNode.nodeID }
    20  
    21  // GetStep returns an int64 of the snowflake step (or sequence) number
    22  func GetStep() int64 { return DefaultNode.step }
    23  
    24  // Next creates and returns a unique snowflake ID
    25  // To help guarantee uniqueness
    26  // - Make sure your system is keeping accurate system time
    27  // - Make sure you never have multiple nodes running with the same node ID
    28  func Next() ID { return DefaultNode.Next() }
    29  
    30  var DefaultNode32, _ = NewNode(
    31  	WithNodeBits(2),
    32  	WithStepBits(1),
    33  	WithTimestampUnit(1*time.Second),
    34  	WithEpoch(1577808000000), // 2020-01-01T00:00:00+08:00
    35  )
    36  
    37  // Next32 creates and returns a unique snowflake ID for positive int32.
    38  // only for low frequency usages.
    39  // unsigned(1) + timestamp(28) + node ID(2) + step(1)
    40  // can use 2^28/60/60/24/365 ≈ 8.5 年
    41  // result example： 459260906
    42  // The range of int32 is [-2147483648, 2147483647] and the uint32 is [0, 4294967295].
    43  func Next32() ID { return DefaultNode32.Next() }