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March 13, 2021 18:43
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package connections | |
import ( | |
"context" | |
"errors" | |
"reflect" | |
"time" | |
"go.mongodb.org/mongo-driver/bson/primitive" | |
"go.mongodb.org/mongo-driver/mongo" | |
"go.mongodb.org/mongo-driver/mongo/options" | |
"go.mongodb.org/mongo-driver/mongo/readpref" | |
) | |
type mongoDB struct { | |
db *mongo.Database | |
} | |
func MongoDB(connStr, database string) (*mongoDB, error) { | |
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second) | |
defer cancel() | |
client, err := mongo.Connect(ctx, options.Client().ApplyURI(connStr)) | |
if err != nil { | |
return nil, err | |
} | |
// Force a connection to verify our connection string | |
ctx, cancel = context.WithTimeout(context.Background(), 2*time.Second) | |
defer cancel() | |
err = client.Ping(ctx, readpref.Primary()) | |
if err != nil { | |
return nil, err | |
} | |
return &mongoDB{db: client.Database(database)}, nil | |
} | |
func (mdb *mongoDB) GetMany(typ reflect.Type, filter map[string]interface{}) (interface{}, error) { | |
ctx, cancel := context.WithTimeout(context.TODO(), 10*time.Second) | |
defer cancel() | |
i := 0 | |
arr := reflect.New(reflect.SliceOf(typ)).Elem() | |
if IDs, hasIDs := filter["ids"]; hasIDs { | |
delete(filter, "ids") | |
strings := IDs.([]string) | |
objIDs := make([]primitive.ObjectID, len(strings)) | |
for _, v := range strings { | |
objID, err := primitive.ObjectIDFromHex(v) | |
if err != nil { | |
continue | |
} | |
objIDs[i] = objID | |
i++ | |
} | |
if i == 0 { | |
arr.Set(reflect.MakeSlice(reflect.SliceOf(typ), 0, 0)) | |
return arr.Addr().Interface(), errors.New("Empty list of ids.") | |
} | |
filter["_id"] = map[string][]primitive.ObjectID{ | |
"$in": objIDs[:i], | |
} | |
} | |
if specieID, hasSpecieID := filter["specie_id"]; hasSpecieID { | |
objID, err := primitive.ObjectIDFromHex(specieID.(string)) | |
if err != nil { | |
arr.Set(reflect.MakeSlice(reflect.SliceOf(typ), 0, 0)) | |
return arr.Addr().Interface(), err | |
} | |
filter["specie_id"] = objID | |
} | |
coll := ToSnakeCase(typ.Name()) | |
cur, err := mdb.db.Collection(coll).Find(ctx, filter) | |
if err != nil { | |
arr.Set(reflect.MakeSlice(reflect.SliceOf(typ), 0, 0)) | |
return arr.Addr().Interface(), err | |
} | |
defer cur.Close(ctx) | |
arr.Set(reflect.MakeSlice(reflect.SliceOf(typ), 0, i)) | |
for cur.Next(ctx) { | |
field := reflect.New(typ) | |
if cur.Decode(field.Interface()) != nil { | |
continue | |
} | |
arr.Set(reflect.Append(arr, field.Elem())) | |
} | |
return arr.Addr().Interface(), cur.Err() | |
} | |
func (mdb *mongoDB) GetOne(typ reflect.Type, filter map[string]interface{}) (interface{}, error) { | |
ctx, cancel := context.WithTimeout(context.TODO(), 5*time.Second) | |
defer cancel() | |
if ID, hasID := filter["id"]; hasID { | |
delete(filter, "id") | |
objID, err := primitive.ObjectIDFromHex(ID.(string)) | |
if err != nil { | |
return reflect.Zero(reflect.PtrTo(typ)).Interface(), err | |
} | |
filter["_id"] = objID | |
} else { | |
panic("Map must include 'id'.") | |
} | |
coll := ToSnakeCase(typ.Name()) | |
field := reflect.New(typ).Interface() | |
err := mdb.db.Collection(coll).FindOne(ctx, filter).Decode(field) | |
if err != nil { | |
return reflect.Zero(reflect.PtrTo(typ)).Interface(), err | |
} | |
return field, nil | |
} | |
func (mdb *mongoDB) Create(typ reflect.Type, data interface{}) error { | |
ctx, cancel := context.WithTimeout(context.TODO(), 5*time.Second) | |
defer cancel() | |
coll := ToSnakeCase(typ.Name()) | |
res, err := mdb.db.Collection(coll).InsertOne(ctx, data) | |
if err != nil { | |
return err | |
} | |
refID := reflect.ValueOf(res.InsertedID) | |
reflect.ValueOf(data).Elem().FieldByName("ID").Set(refID) | |
return nil | |
} | |
func (mdb *mongoDB) Update(typ reflect.Type, filter map[string]interface{}, data interface{}) error { | |
ctx, cancel := context.WithTimeout(context.TODO(), 5*time.Second) | |
defer cancel() | |
if ID, hasID := filter["id"]; hasID { | |
delete(filter, "id") | |
objID, err := primitive.ObjectIDFromHex(ID.(string)) | |
if err != nil { | |
return err | |
} | |
filter["_id"] = objID | |
} else { | |
panic("Map must include 'id'.") | |
} | |
coll := ToSnakeCase(typ.Name()) | |
update := map[string]interface{}{"$set": data} | |
oldData := reflect.New(typ).Interface() | |
err := mdb.db.Collection(coll).FindOneAndUpdate(ctx, filter, update).Decode(oldData) | |
if err != nil { | |
return err | |
} | |
refData := reflect.ValueOf(data).Elem() | |
refOldData := reflect.ValueOf(oldData).Elem() | |
for i := 0; i < refData.NumField(); i++ { | |
field := refData.Field(i) | |
if !field.IsZero() { | |
refOldData.Field(i).Set(field) | |
} | |
} | |
refData.Set(refOldData) | |
return nil | |
} | |
func (mdb *mongoDB) Replace(typ reflect.Type, filter map[string]interface{}, data interface{}) error { | |
ctx, cancel := context.WithTimeout(context.TODO(), 5*time.Second) | |
defer cancel() | |
if ID, hasID := filter["id"]; hasID { | |
delete(filter, "id") | |
objID, err := primitive.ObjectIDFromHex(ID.(string)) | |
if err != nil { | |
return err | |
} | |
filter["_id"] = objID | |
} else { | |
panic("Map must include 'id'.") | |
} | |
coll := ToSnakeCase(typ.Name()) | |
oldData := reflect.New(typ).Interface() | |
err := mdb.db.Collection(coll).FindOneAndReplace(ctx, filter, data).Decode(oldData) | |
if err != nil { | |
return err | |
} | |
refData := reflect.ValueOf(data).Elem() | |
refOldData := reflect.ValueOf(oldData).Elem() | |
for i := 0; i < refData.NumField(); i++ { | |
field := refData.Field(i) | |
if !field.IsZero() { | |
refOldData.Field(i).Set(field) | |
} | |
} | |
refData.Set(refOldData) | |
return nil | |
} | |
func (mdb *mongoDB) Delete(typ reflect.Type, filter map[string]interface{}) (interface{}, error) { | |
ctx, cancel := context.WithTimeout(context.TODO(), 5*time.Second) | |
defer cancel() | |
if ID, hasID := filter["id"]; hasID { | |
delete(filter, "id") | |
objID, err := primitive.ObjectIDFromHex(ID.(string)) | |
if err != nil { | |
return reflect.Zero(reflect.PtrTo(typ)).Interface(), err | |
} | |
filter["_id"] = objID | |
} else { | |
panic("Map must include 'id'.") | |
} | |
coll := ToSnakeCase(typ.Name()) | |
field := reflect.New(typ).Interface() | |
err := mdb.db.Collection(coll).FindOneAndDelete(ctx, filter).Decode(field) | |
if err != nil { | |
return reflect.Zero(reflect.PtrTo(typ)).Interface(), err | |
} | |
return field, nil | |
} |
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