oc-lib/dbs/mongo/mongo.go

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package mongo
import (
"context"
"errors"
"time"
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"cloud.o-forge.io/core/oc-lib/dbs"
"cloud.o-forge.io/core/oc-lib/logs"
"github.com/rs/zerolog"
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"go.mongodb.org/mongo-driver/bson"
"go.mongodb.org/mongo-driver/mongo"
"go.mongodb.org/mongo-driver/mongo/options"
)
var (
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mngoClient *mongo.Client
mngoDB *mongo.Database
MngoCtx context.Context
cancel context.CancelFunc
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existingCollections []string
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ResourceMap map[string]interface{}
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)
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var MONGOService = MongoDB{}
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type MongoConf interface {
GetUrl() string
GetDatabase() string
}
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type MongoDB struct {
Logger zerolog.Logger
}
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func (m *MongoDB) Init(collections []string, config MongoConf) {
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// var baseConfig string
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m.Logger = logs.GetLogger()
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ResourceMap = make(map[string]interface{})
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m.Logger.Info().Msg("Connecting to" + config.GetUrl())
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MngoCtx, cancel = context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()
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m.createClient(config.GetUrl())
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m.Logger.Info().Msg("Connecting mongo client to db " + config.GetDatabase())
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m.prepareDB(collections, config)
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m.Logger.Info().Msg("Database is READY")
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}
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func (m *MongoDB) createClient(MongoURL string) {
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var err error
// Allows us to use marshal and unmarshall with results of FindOne() and others
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bsonOpts := &options.BSONOptions{
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UseJSONStructTags: true,
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NilSliceAsEmpty: true,
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}
clientOptions := options.Client().ApplyURI(MongoURL).SetBSONOptions(bsonOpts)
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mngoClient, err = mongo.Connect(MngoCtx, clientOptions)
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if err != nil {
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m.Logger.Fatal().Msg("Mongodb NewClient " + MongoURL + ":" + "err")
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panic(err)
}
// Ping the primary
if mngoClient, err = mongo.Connect(MngoCtx, clientOptions); err != nil {
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m.Logger.Fatal().Msg("Mongodb connect " + MongoURL + ":" + "err")
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panic(err)
}
if err = mngoClient.Ping(MngoCtx, nil); err != nil {
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m.Logger.Fatal().Msg("Mongodb ping " + MongoURL + ":" + "err")
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panic(err)
}
}
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func (m *MongoDB) prepareDB(list_collection []string, config MongoConf) {
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var err error
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mngoDB = mngoClient.Database(config.GetDatabase())
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existingCollections, err = mngoDB.ListCollectionNames(MngoCtx, bson.D{})
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if err != nil {
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m.Logger.Fatal().Msg("Error contacting MongoDB\n" + err.Error())
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}
collectionMap := make(map[string]bool)
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for _, name := range existingCollections {
collectionMap[name] = true
}
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// Only do the collection definition process if it doesn't already exists
// we add the collection to the collection map from mongo/mongo_utils to provide faster access to the collection
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for _, collection_name := range list_collection {
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new_collection := mngoDB.Collection(collection_name)
if _, exists := collectionMap[collection_name]; !exists {
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m.createCollection(collection_name, new_collection)
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} else {
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CollectionMap[collection_name] = new_collection
}
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}
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}
// Creates the collection with index specified in mongo/mongo_collections
// or use the basic collection creation function
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func (m *MongoDB) createCollection(collection_name string, new_collection *mongo.Collection) {
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var err error
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CollectionMap[collection_name] = new_collection
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_, exists := IndexesMap[collection_name]
if exists {
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if _, err = new_collection.Indexes().CreateMany(MngoCtx, IndexesMap[collection_name]); err != nil {
var cmdErr mongo.CommandError
if errors.As(err, &cmdErr) && cmdErr.Code != 85 {
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m.Logger.Fatal().Msg("Error creating indexes for " + collection_name + " collection : \n" + err.Error())
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panic(err)
} else if !errors.As(err, &cmdErr) {
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m.Logger.Fatal().Msg("Unexpected error: " + err.Error())
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panic(err)
}
}
} else {
mngoDB.CreateCollection(MngoCtx, collection_name)
}
}
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func (m *MongoDB) DeleteOne(id string, collection_name string) (int64, int, error) {
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filter := bson.M{"_id": id}
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targetDBCollection := CollectionMap[collection_name]
opts := options.Delete().SetHint(bson.D{{Key: "_id", Value: 1}})
MngoCtx, cancel = context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()
result, err := targetDBCollection.DeleteOne(MngoCtx, filter, opts)
if err != nil {
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m.Logger.Error().Msg("Couldn't insert resource: " + err.Error())
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return 0, 404, err
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}
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return result.DeletedCount, 200, nil
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}
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func (m *MongoDB) UpdateOne(set interface{}, id string, collection_name string) (string, int, error) {
var doc map[string]interface{}
b, _ := bson.Marshal(set)
bson.Unmarshal(b, &doc)
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filter := bson.M{"_id": id}
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targetDBCollection := CollectionMap[collection_name]
MngoCtx, cancel = context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()
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_, err := targetDBCollection.UpdateOne(MngoCtx, filter, dbs.InputToBson(doc, true))
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if err != nil {
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m.Logger.Error().Msg("Couldn't update resource: " + err.Error())
return "", 404, err
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}
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return id, 200, nil
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}
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func (m *MongoDB) StoreOne(obj interface{}, id string, collection_name string) (string, int, error) {
var doc map[string]interface{}
b, _ := bson.Marshal(obj)
bson.Unmarshal(b, &doc)
doc["_id"] = id
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targetDBCollection := CollectionMap[collection_name]
MngoCtx, cancel = context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()
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_, err := targetDBCollection.InsertOne(MngoCtx, doc)
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if err != nil {
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m.Logger.Error().Msg("Couldn't insert resource: " + err.Error())
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return "", 409, err
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}
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return id, 200, nil
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}
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func (m *MongoDB) LoadOne(id string, collection_name string) (*mongo.SingleResult, int, error) {
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filter := bson.M{"_id": id}
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targetDBCollection := CollectionMap[collection_name]
MngoCtx, cancel = context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()
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res := targetDBCollection.FindOne(MngoCtx, filter)
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if res.Err() != nil {
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m.Logger.Error().Msg("Couldn't find resource " + id + ". Error : " + res.Err().Error())
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err := res.Err()
return nil, 404, err
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}
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return res, 200, nil
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}