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redis_database.go
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/
redis_database.go
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// Copyright 2016 IBM Corporation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package database
import (
"time"
log "github.com/Sirupsen/logrus"
"github.com/garyburd/redigo/redis"
"github.com/amalgam8/amalgam8/registry/utils/logging"
)
type redisDB struct {
conn redis.Conn
pool *redis.Pool
logger *log.Entry
address string
password string
}
// NewRedisDB returns an instance of a Redis database
func NewRedisDB(address string, password string) Database {
return NewRedisDBWithConn(nil, address, password)
}
// NewRedisDBWithConn returns an instance of a Redis database using an existing connection
func NewRedisDBWithConn(conn redis.Conn, address string, password string) Database {
db := &redisDB{
conn: conn,
pool: nil,
address: address,
password: password,
logger: logging.GetLogger(module),
}
return db
}
// NewRedisDBWithPool returns an instance of a Redis database using an existing connection pool
func NewRedisDBWithPool(pool *redis.Pool) Database {
db := &redisDB{
conn: nil,
pool: pool,
address: "",
password: "",
logger: logging.GetLogger(module),
}
return db
}
func (rdb *redisDB) connect() (redis.Conn, error) {
var conn redis.Conn
var err error
if rdb.pool == nil {
// Connect to Redis
conn, err = redis.Dial("tcp", rdb.address)
if err != nil {
return nil, err
}
_, err = conn.Do("AUTH", rdb.password)
if err != nil {
conn.Close()
return nil, err
}
} else {
conn = rdb.pool.Get()
}
return conn, nil
}
func (rdb *redisDB) ReadKeys(match string) ([]string, error) {
var err error
conn := rdb.conn
if rdb.conn == nil {
conn, err = rdb.connect()
if err != nil {
return nil, err
}
defer conn.Close()
}
matches, err := rdb.scan(conn, match)
return matches, err
}
func (rdb *redisDB) ReadEntry(key string) ([]byte, error) {
var err error
conn := rdb.conn
if rdb.conn == nil {
conn, err = rdb.connect()
if err != nil {
return nil, err
}
defer conn.Close()
}
value, err := conn.Do("GET", key)
if value == nil || err != nil {
return nil, err
}
return redis.Bytes(value, err)
}
func (rdb *redisDB) ReadAllEntries(match string) (map[string]string, error) {
var err error
conn := rdb.conn
if rdb.conn == nil {
conn, err = rdb.connect()
if err != nil {
return nil, err
}
defer conn.Close()
}
entries := make(map[string]string)
matches, err := rdb.scan(conn, match)
var args []interface{}
for _, k := range matches {
args = append(args, k)
}
values, err := redis.Strings(conn.Do("MGET", args...))
if err != nil {
return nil, err
}
for i, value := range values {
entries[matches[i]] = value
}
return entries, nil
}
func (rdb *redisDB) InsertEntry(key string, entry []byte) error {
var err error
conn := rdb.conn
if rdb.conn == nil {
conn, err = rdb.connect()
if err != nil {
return err
}
defer conn.Close()
}
_, err = conn.Do("SET", key, entry)
return err
}
func (rdb *redisDB) DeleteEntry(key string) (int, error) {
var err error
conn := rdb.conn
if rdb.conn == nil {
conn, err = rdb.connect()
if err != nil {
return 0, err
}
defer conn.Close()
}
return redis.Int(conn.Do("DEL", key))
}
func (rdb *redisDB) Expire(key string, ttl time.Duration) error {
var err error
conn := rdb.conn
if rdb.conn == nil {
conn, err = rdb.connect()
if err != nil {
return err
}
defer conn.Close()
}
_, err = conn.Do("EXPIRE", key, ttl.Seconds())
return err
}
func (rdb *redisDB) scan(conn redis.Conn, match string) ([]string, error) {
var (
cursor int64
keys []string
)
var matches []string
for {
items, err := redis.Values(conn.Do("SCAN", cursor, "MATCH", match))
if err != nil || items == nil || len(items) == 0 {
return matches, err
}
items, err = redis.Scan(items, &cursor, &keys)
if err != nil {
return matches, err
}
matches = append(matches, keys...)
if cursor == 0 {
break
}
}
return matches, nil
}