github.com/wangyougui/gf/v2@v2.6.5/database/gredis/gredis_instance.go (about)

     1  // Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
     2  //
     3  // This Source Code Form is subject to the terms of the MIT License.
     4  // If a copy of the MIT was not distributed with this file,
     5  // You can obtain one at https://github.com/wangyougui/gf.
     6  
     7  package gredis
     8  
     9  import (
    10  	"context"
    11  
    12  	"github.com/wangyougui/gf/v2/container/gmap"
    13  	"github.com/wangyougui/gf/v2/internal/intlog"
    14  )
    15  
    16  var (
    17  	// localInstances for instance management of redis client.
    18  	localInstances = gmap.NewStrAnyMap(true)
    19  )
    20  
    21  // Instance returns an instance of redis client with specified group.
    22  // The `name` param is unnecessary, if `name` is not passed,
    23  // it returns a redis instance with default configuration group.
    24  func Instance(name ...string) *Redis {
    25  	group := DefaultGroupName
    26  	if len(name) > 0 && name[0] != "" {
    27  		group = name[0]
    28  	}
    29  	v := localInstances.GetOrSetFuncLock(group, func() interface{} {
    30  		if config, ok := GetConfig(group); ok {
    31  			r, err := New(config)
    32  			if err != nil {
    33  				intlog.Errorf(context.TODO(), `%+v`, err)
    34  				return nil
    35  			}
    36  			return r
    37  		}
    38  		return nil
    39  	})
    40  	if v != nil {
    41  		return v.(*Redis)
    42  	}
    43  	return nil
    44  }