Issue on closing closed channel

[norbertogomez]

Using your solution as part of a repository in a web server, the first API call does the import in a successful way. On the second call, looks like the library is trying to close an already closed channel.

The error I am getting:

panic: close of closed channel
marketing-feed-manager | 
marketing-feed-manager | goroutine 585 [running]:
marketing-feed-manager | github.com/gosuri/uiprogress.(*Progress).Listen(0xc000041680)
marketing-feed-manager | 	/go/pkg/mod/github.com/gosuri/[email protected]/progress.go:117 +0x108
marketing-feed-manager | created by github.com/gosuri/uiprogress.(*Progress).Start
marketing-feed-manager | 	/go/pkg/mod/github.com/gosuri/[email protected]/progress.go:134 +0x3f

The way I use the mongoimport library:

	conn := mongoimport.MongoConnection{
		AuthDatabaseName: m.AuthDatabase,
		DatabaseName:     m.Database,
		Host:             m.Host,
		Password:         m.Password,
		Port:             m.Port,
		User:             m.User,
	}

	datasources := []*mongoimport.Datasource{
		{
			Description:  "All offers",
			FileProvider: &files.List{Files: []string{filepath}},
			Options: mongoimport.Options{
				Collection: m.Collection + market.Code,
			},
		},
	}

	csvLoader := loaders.DefaultCSVLoader()
	csvLoader.Excel = false
	importer := mongoimport.Import{
		Sources:    datasources,
		Connection: &conn,
		Options: mongoimport.Options{
			EmptyCollection:    opt.SetFlag(true),
			IndividualProgress: opt.SetFlag(false),
			Loader:             loaders.Loader{SpecificLoader: csvLoader},
			FailOnErrors:       opt.SetFlag(false),
			PostLoad: func(loaded map[string]interface{}) ([]interface{}, error) {
				return []interface{}{loaded}, nil
			},
		},
	}

	result, err := importer.Start()

After a debugging session, I think the issue could be in here

[jaumebecks]

I think this is related to gosuri/uiprogress#40 @romnn
Specifically when initializing a UI progress bar in

mongoimport/import.go

Line 79 in 4b28142

uiprogress.Start()

, you might use uip := uiprogress.New() instead