/
mongo.go
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/
mongo.go
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package main
// mongo module
//
// Copyright (c) 2023 - Valentin Kuznetsov <vkuznet AT gmail dot com>
//
// References : https://gist.github.com/boj/5412538
// https://gist.github.com/border/3489566
import (
"log"
"gopkg.in/mgo.v2"
"gopkg.in/mgo.v2/bson"
)
// MongoConnection defines connection to MongoDB
type MongoConnection struct {
Session *mgo.Session
}
// Connect provides connection to MongoDB
func (m *MongoConnection) Connect() (*mgo.Session, error) {
var err error
if m.Session == nil {
m.Session, err = mgo.Dial(Config.DBURI)
if err != nil {
return nil, err
}
// m.Session.SetMode(mgo.Monotonic, true)
m.Session.SetMode(mgo.Strong, true)
}
return m.Session.Clone(), nil
}
// global object which holds MongoDB connection
var _Mongo MongoConnection
// MongoInsert records into MongoDB
func MongoInsert(dbname, collname string, records []Record) error {
s, err := _Mongo.Connect()
if err != nil {
log.Println("Unable to connect to MongoDB", err)
return err
}
defer s.Close()
c := s.DB(dbname).C(collname)
for _, rec := range records {
if err := c.Insert(&rec); err != nil {
log.Printf("Fail to insert record %v, error %v\n", rec, err)
return err
}
}
return nil
}
// MongoUpsert records into MongoDB
func MongoUpsert(dbname, collname string, records []Record) error {
s, err := _Mongo.Connect()
if err != nil {
log.Println("Unable to connect to MongoDB", err)
return err
}
defer s.Close()
c := s.DB(dbname).C(collname)
for _, rec := range records {
model := rec.Model
if model == "" {
log.Printf("no model, record %v\n", rec)
continue
}
spec := bson.M{"model": model}
if _, err := c.Upsert(spec, &rec); err != nil {
log.Printf("Fail to insert record %v, error %v\n", rec, err)
return err
}
}
return nil
}
// MongoGet records from MongoDB
func MongoGet(dbname, collname string, spec bson.M, idx, limit int) ([]Record, error) {
out := []Record{}
s, err := _Mongo.Connect()
if err != nil {
log.Println("Unable to connect to MongoDB", err)
return out, err
}
defer s.Close()
c := s.DB(dbname).C(collname)
if limit > 0 {
err = c.Find(spec).Skip(idx).Limit(limit).All(&out)
} else {
err = c.Find(spec).Skip(idx).All(&out)
}
if err != nil {
log.Printf("Unable to get records, error %v\n", err)
}
return out, err
}
// MongoGetSorted records from MongoDB sorted by given key
func MongoGetSorted(dbname, collname string, spec bson.M, skeys []string) ([]Record, error) {
out := []Record{}
s, err := _Mongo.Connect()
if err != nil {
log.Println("Unable to connect to MongoDB", err)
return out, err
}
defer s.Close()
c := s.DB(dbname).C(collname)
err = c.Find(spec).Sort(skeys...).All(&out)
if err != nil {
log.Printf("Unable to sort records, error %v\n", err)
// try to fetch all unsorted data
err = c.Find(spec).All(&out)
if err != nil {
log.Printf("Unable to find records, error %v\n", err)
}
}
return out, err
}
// helper function to present in bson selected fields
func sel(q ...string) (r bson.M) {
r = make(bson.M, len(q))
for _, s := range q {
r[s] = 1
}
return
}
// MongoUpdate inplace for given spec
func MongoUpdate(dbname, collname string, spec, newdata bson.M) error {
s, err := _Mongo.Connect()
if err != nil {
log.Println("Unable to connect to MongoDB", err)
return err
}
defer s.Close()
c := s.DB(dbname).C(collname)
err = c.Update(spec, newdata)
if err != nil {
log.Printf("Unable to update record, spec %v, data %v, error %v\n", spec, newdata, err)
}
return err
}
// MongoCount gets number records from MongoDB
func MongoCount(dbname, collname string, spec bson.M) int {
s, err := _Mongo.Connect()
if err != nil {
log.Println("Unable to connect to MongoDB", err)
return 0
}
defer s.Close()
c := s.DB(dbname).C(collname)
nrec, err := c.Find(spec).Count()
if err != nil {
log.Printf("Unable to count records, spec %v, error %v\n", spec, err)
}
return nrec
}
// MongoRemove records from MongoDB
func MongoRemove(dbname, collname string, spec bson.M) error {
s, err := _Mongo.Connect()
if err != nil {
log.Println("Unable to connect to MongoDB", err)
return err
}
defer s.Close()
c := s.DB(dbname).C(collname)
_, err = c.RemoveAll(spec)
if err != nil && err != mgo.ErrNotFound {
log.Printf("Unable to remove records, spec %v, error %v\n", spec, err)
}
return err
}