timetable-mgr/dbAccess/common.go

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package dbAccess
import (
"context"
"time"
"git.fjla.uk/owlboard/timetable-mgr/log"
"go.mongodb.org/mongo-driver/bson"
"go.mongodb.org/mongo-driver/mongo/options"
"go.uber.org/zap"
)
// CAUTION: Drops the collection named in collectionName
func DropCollection(collectionName string) error {
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log.Info("Dropping collection", zap.String("Collection Name", collectionName))
database := MongoClient.Database(DatabaseName)
collection := database.Collection(collectionName)
err := collection.Drop(context.Background())
if err != nil {
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log.Error("Error dropping collection", zap.String("Collection Name", collectionName), zap.Error(err))
return err
}
return nil
}
// Checks the update time (unix timestamp) of the collection named in collectionName, uses 'type: collection' entries in the meta collection
func CheckUpdateTime(collectionName string) (int64, error) {
database := MongoClient.Database(DatabaseName)
collection := database.Collection(MetaCollection)
filter := bson.D{
{Key: "target", Value: collectionName},
{Key: "type", Value: "collection"},
}
var result struct {
Updated int64 `bson:"updated"`
}
err := collection.FindOne(context.Background(), filter).Decode(&result)
if err != nil {
return 0, err
}
return result.Updated, nil
}
// Sets a new update time (unix timestamp) of the collection named in collectionName. The update time is calculated within the function.
func SetUpdateTime(collectionName string) error {
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log.Info("Setting update time", zap.String("collection", collectionName))
database := MongoClient.Database(DatabaseName)
collection := database.Collection("meta")
options := options.Update().SetUpsert(true)
updateTime := time.Now().Unix()
filter := bson.M{
"target": collectionName,
"type": "collection",
}
update := bson.M{
"$set": bson.M{
"updated": updateTime,
"updated_time": time.Now().In(time.UTC),
"target": collectionName,
"type": "collection",
},
}
_, err := collection.UpdateOne(context.Background(), filter, update, options)
if err != nil {
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log.Error("Error setting update time", zap.String("collection", collectionName), zap.Error(err))
return err
}
return nil
}