timetable-mgr/dbAccess/cif.go

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package dbAccess
import (
"context"
"errors"
"time"
"git.fjla.uk/owlboard/go-types/pkg/database"
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"git.fjla.uk/owlboard/timetable-mgr/log"
"go.mongodb.org/mongo-driver/bson"
"go.mongodb.org/mongo-driver/mongo"
"go.mongodb.org/mongo-driver/mongo/options"
"go.uber.org/zap"
)
const Doctype = "CifMetadata"
// The type describing the CifMetadata 'type' in the database.
// This type will be moved to owlboard/go-types
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type CifMetadata struct {
Doctype string `bson:"type"`
LastUpdate time.Time `bson:"lastUpdate"`
LastTimestamp int64 `bson:"lastTimestamp"`
LastSequence int64 `bson:"lastSequence"`
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}
// Fetches the CifMetadata from the database, returns nil if no metadata exists - before first initialisation for example.
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func GetCifMetadata() (*CifMetadata, error) {
database := MongoClient.Database(databaseName)
collection := database.Collection(metaCollection)
filter := bson.M{"type": Doctype}
var result CifMetadata
err := collection.FindOne(context.Background(), filter).Decode(&result)
if err != nil {
if errors.Is(err, mongo.ErrNoDocuments) {
return nil, nil
}
log.Msg.Error("Error fetching CIF Metadata")
return nil, err
}
log.Msg.Debug("Fetched CIF Metadata from database", zap.Any("Metadata", result))
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return &result, nil
}
// Uses upsert to Insert/Update the CifMetadata in the database
func PutCifMetadata(metadata *CifMetadata) bool {
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database := MongoClient.Database(databaseName)
collection := database.Collection(metaCollection)
options := options.Update().SetUpsert(true)
filter := bson.M{"type": Doctype}
update := bson.M{
"$set": bson.M{
"type": Doctype,
"lastUpdate": metadata.LastUpdate,
"lastTimestamp": metadata.LastTimestamp,
"lastSequence": metadata.LastSequence,
},
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}
_, err := collection.UpdateOne(context.Background(), filter, update, options)
if err != nil {
log.Msg.Error("Error updating CIF Metadata", zap.Error(err))
return false
}
log.Msg.Info("New CIF Metadata written", zap.Time("Update time", metadata.LastUpdate))
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return true
}
// Handles 'Delete' tasks from CIF Schedule updates, accepts DeleteQuery types and batches deletions.
func DeleteCifEntries(deletions []database.DeleteQuery) error {
// Skip if deletions is empty
if len(deletions) == 0 {
log.Msg.Info("No deletions required")
return nil
}
// Prepare deletion tasks
collection := MongoClient.Database(databaseName).Collection(timetableCollection)
bulkDeletions := make([]mongo.WriteModel, 0, len(deletions))
for _, deleteQuery := range deletions {
filter := bson.M{
"trainUid": deleteQuery.TrainUid,
"scheduleStartDate": deleteQuery.ScheduleStartDate,
"stpIndicator": deleteQuery.StpIndicator,
}
bulkDeletions = append(bulkDeletions, mongo.NewDeleteManyModel().SetFilter(filter))
}
_, err := collection.BulkWrite(context.Background(), bulkDeletions)
if err != nil {
log.Msg.Error("Error deleting documents", zap.Error(err))
return err
}
return nil
}
// Handles 'Create' tasks for CIF Schedule updates, accepts Service structs and batches their creation.
func CreateCifEntries(schedules []database.Service) error {
// Skip if deletions is empty
if len(schedules) == 0 {
log.Msg.Info("No creations required")
return nil
}
collection := MongoClient.Database(databaseName).Collection(timetableCollection)
models := make([]mongo.WriteModel, 0, len(schedules))
for _, s := range schedules {
model := mongo.NewInsertOneModel().SetDocument(s)
models = append(models, model)
}
bulkWriteOptions := options.BulkWrite().SetOrdered(false)
_, err := collection.BulkWrite(context.Background(), models, bulkWriteOptions)
if err != nil {
log.Msg.Error("Error inserting documents", zap.Error(err))
return err
}
return nil
}