42 lines
835 B
Go
42 lines
835 B
Go
package id
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import (
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"fmt"
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"sync"
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"time"
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"github.com/bwmarrin/snowflake"
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"spark-server/internal/pkg/errs"
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)
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// Generator issues Snowflake MsgIds. Worker ID is fixed per machine. Clock rewind is rejected.
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type Generator struct {
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mu sync.Mutex
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node *snowflake.Node
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lastMs int64
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workerID int64
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}
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func New(workerID int64) (*Generator, error) {
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node, err := snowflake.NewNode(workerID)
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if err != nil {
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return nil, fmt.Errorf("snowflake node: %w", err)
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}
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return &Generator{node: node, workerID: workerID}, nil
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}
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func (g *Generator) NextMsgID() (int64, error) {
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g.mu.Lock()
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defer g.mu.Unlock()
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now := time.Now().UnixMilli()
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if now < g.lastMs {
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return 0, errs.ErrClockRewind
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}
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id := g.node.Generate().Int64()
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g.lastMs = now
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return id, nil
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}
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func (g *Generator) WorkerID() int64 { return g.workerID }
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