github.com/willyham/dosa@v2.3.1-0.20171024181418-1e446d37ee71+incompatible/connectors/redis/redigo.go (about)

     1  // Copyright (c) 2017 Uber Technologies, Inc.
     2  //
     3  // Permission is hereby granted, free of charge, to any person obtaining a copy
     4  // of this software and associated documentation files (the "Software"), to deal
     5  // in the Software without restriction, including without limitation the rights
     6  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     7  // copies of the Software, and to permit persons to whom the Software is
     8  // furnished to do so, subject to the following conditions:
     9  //
    10  // The above copyright notice and this permission notice shall be included in
    11  // all copies or substantial portions of the Software.
    12  //
    13  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    14  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    15  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    16  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    17  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    18  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    19  // THE SOFTWARE.
    20  
    21  package redis
    22  
    23  import (
    24  	"fmt"
    25  	"time"
    26  
    27  	"github.com/garyburd/redigo/redis"
    28  	"github.com/uber-go/dosa"
    29  )
    30  
    31  // NewRedigoClient returns a redigo implementation of SimpleRedis
    32  func NewRedigoClient(config ServerConfig) SimpleRedis {
    33  	c := &simpleRedis{config: config}
    34  	c.pool = &redis.Pool{
    35  		MaxActive:   config.MaxActive,
    36  		MaxIdle:     config.MaxIdle,
    37  		IdleTimeout: config.IdleTimeout,
    38  		Dial: func() (redis.Conn, error) {
    39  			c, err := redis.Dial(
    40  				"tcp",
    41  				c.getURL(),
    42  				redis.DialConnectTimeout(config.ConnectTimeout),
    43  				redis.DialReadTimeout(config.ReadTimeout),
    44  				redis.DialWriteTimeout(config.WriteTimeout))
    45  			if err != nil {
    46  				return nil, err
    47  			}
    48  			return c, err
    49  		},
    50  		Wait: false,
    51  	}
    52  	return c
    53  }
    54  
    55  type simpleRedis struct {
    56  	config ServerConfig
    57  	pool   *redis.Pool
    58  }
    59  
    60  func (c *simpleRedis) getURL() string {
    61  	return fmt.Sprintf("%s:%d", c.config.Host, c.config.Port)
    62  }
    63  
    64  // Get returns an error if the key is not found in cache
    65  func (c *simpleRedis) Get(key string) ([]byte, error) {
    66  	bytes, err := redis.Bytes(c.do("GET", key))
    67  	if err == redis.ErrNil {
    68  		err = &dosa.ErrNotFound{}
    69  	}
    70  	return bytes, err
    71  }
    72  
    73  func (c *simpleRedis) SetEx(key string, value []byte, ttl time.Duration) error {
    74  	_, err := c.do("SET", key, value, "EX", ttl.Seconds())
    75  	return err
    76  }
    77  
    78  func (c *simpleRedis) Del(key string) error {
    79  	_, err := c.do("DEL", key)
    80  	return err
    81  }
    82  
    83  // Shutdown closes the underlying connection pool to redis
    84  func (c *simpleRedis) Shutdown() error {
    85  	return c.pool.Close()
    86  }
    87  
    88  // Do is a proxy method that calls Redigo's `Do` method and returns its output. It remembers
    89  // to close connections taken from the pool
    90  func (c *simpleRedis) do(commandName string, args ...interface{}) (interface{}, error) {
    91  	conn := c.pool.Get()
    92  	defer func() { _ = conn.Close() }()
    93  	return conn.Do(commandName, args...)
    94  }