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37 lines
738 B
37 lines
738 B
package counter
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import (
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"git.aiterp.net/rpdata/api/internal/store"
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"github.com/globalsign/mgo"
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"github.com/globalsign/mgo/bson"
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)
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var collection *mgo.Collection
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type counter struct {
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ID string `bson:"_id"`
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Value int `bson:"value"`
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}
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// Next gets the next value of a counter, or an error if it hasn't.
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func Next(category, name string) (int, error) {
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id := category + "." + name
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doc := counter{}
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_, err := collection.Find(bson.M{"_id": id}).Apply(mgo.Change{
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Update: bson.M{"$inc": bson.M{"value": 1}},
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Upsert: true,
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ReturnNew: true,
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}, &doc)
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if err != nil {
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return -1, err
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}
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return doc.Value, nil
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}
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func init() {
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store.HandleInit(func(db *mgo.Database) {
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collection = db.C("core.counters")
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})
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}
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