forked from huaban/periodic
/
redis.go
226 lines (205 loc) · 5.28 KB
/
redis.go
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package redis
import (
"errors"
"fmt"
"github.com/Lupino/periodic/driver"
"github.com/garyburd/redigo/redis"
"github.com/golang/groupcache/lru"
"log"
"strconv"
"strings"
"sync"
)
// PREFIX the redis key prefix
const PREFIX = "periodic:job:"
// Driver define a redis store driver
type Driver struct {
pool *redis.Pool
RWLocker *sync.Mutex
cache *lru.Cache
}
// NewDriver create a redis driver
func NewDriver(server string) Driver {
parts := strings.SplitN(server, "://", 2)
pool := redis.NewPool(func() (conn redis.Conn, err error) {
conn, err = redis.Dial("tcp", parts[1])
return
}, 3)
var cache *lru.Cache
cache = lru.New(1000)
var RWLocker = new(sync.Mutex)
return Driver{pool: pool, cache: cache, RWLocker: RWLocker}
}
func (r Driver) get(jobID int64) (job driver.Job, err error) {
var data []byte
var conn = r.pool.Get()
defer conn.Close()
var key = PREFIX + strconv.FormatInt(jobID, 10)
if val, hit := r.cache.Get(key); hit {
return val.(driver.Job), nil
}
data, err = redis.Bytes(conn.Do("GET", key))
if err != nil {
return
}
job, err = driver.NewJob(data)
if err == nil {
r.cache.Add(key, job)
}
return
}
// Save job. when job is exists update it, other create one.
func (r Driver) Save(job *driver.Job, force ...bool) (err error) {
defer r.RWLocker.Unlock()
r.RWLocker.Lock()
var key string
var prefix = PREFIX + job.Func + ":"
var conn = r.pool.Get()
defer conn.Close()
if job.ID > 0 && (len(force) == 0 || !force[0]) {
old, e := r.get(job.ID)
key = PREFIX + strconv.FormatInt(job.ID, 10)
if e != nil || old.ID < 1 {
err = fmt.Errorf("Update Job %d fail, the old job is not exists.", job.ID)
return
}
r.cache.Remove(key)
if old.Name != job.Name {
if _, e := conn.Do("ZERM", prefix+"name", old.Name); e != nil {
log.Printf("Error: ZREM %s %s failed\n", prefix+"name", old.Name)
}
}
} else {
job.ID, err = redis.Int64(conn.Do("INCRBY", PREFIX+"sequence", 1))
if err != nil {
return
}
}
idx, _ := redis.Int64(conn.Do("ZSCORE", prefix+"name", job.Name))
if idx > 0 && idx != job.ID {
err = errors.New("Duplicate Job name: " + job.Name)
return
}
key = PREFIX + strconv.FormatInt(job.ID, 10)
_, err = conn.Do("SET", key, job.Bytes())
if err == nil {
if _, e := conn.Do("ZADD", prefix+"name", job.ID, job.Name); e != nil {
log.Printf("Error: ZADD %s %d %s fail\n", prefix+"name", job.ID, job.Name)
}
if _, e := conn.Do("ZADD", PREFIX+"ID", job.ID, strconv.FormatInt(job.ID, 10)); e != nil {
log.Printf("Error: ZADD %s %d %d fail\n", PREFIX+"ID", job.ID, job.ID)
}
}
return
}
// Delete a job with job id.
func (r Driver) Delete(jobID int64) (err error) {
defer r.RWLocker.Unlock()
r.RWLocker.Lock()
var key = PREFIX + strconv.FormatInt(jobID, 10)
job, e := r.get(jobID)
if e != nil {
return e
}
var prefix = PREFIX + job.Func + ":"
var conn = r.pool.Get()
defer conn.Close()
_, err = conn.Do("DEL", key)
conn.Do("ZREM", prefix+"name", job.Name)
conn.Do("ZREM", PREFIX+"ID", strconv.FormatInt(job.ID, 10))
r.cache.Remove(key)
return
}
// Get a job with job id.
func (r Driver) Get(jobID int64) (job driver.Job, err error) {
defer r.RWLocker.Unlock()
r.RWLocker.Lock()
job, err = r.get(jobID)
return
}
// GetOne get a job with func and name.
func (r Driver) GetOne(Func string, jobName string) (job driver.Job, err error) {
defer r.RWLocker.Unlock()
r.RWLocker.Lock()
var conn = r.pool.Get()
defer conn.Close()
jobID, _ := redis.Int64(conn.Do("ZSCORE", PREFIX+Func+":name", jobName))
if jobID > 0 {
return r.get(jobID)
}
return
}
// NewIterator create a job Iterator with func or nil.
func (r Driver) NewIterator(Func []byte) driver.Iterator {
r.RWLocker.Lock()
return &Iterator{
Func: Func,
cursor: 0,
cacheJob: make([]driver.Job, 0),
start: 0,
limit: 20,
err: nil,
r: r,
}
}
// Close the redis driver
func (r Driver) Close() error {
return nil
}
// Iterator define the job iterator
type Iterator struct {
Func []byte
cursor int
err error
cacheJob []driver.Job
start int
limit int
r Driver
}
// Next advances the iterator to the next value, which will then be available through
// then the Value method. It returns false if no further advancement is possible.
func (iter *Iterator) Next() bool {
iter.cursor++
if len(iter.cacheJob) > 0 && len(iter.cacheJob) > iter.cursor {
return true
}
start := iter.start
stop := iter.start + iter.limit - 1
iter.start = iter.start + iter.limit
var err error
var conn = iter.r.pool.Get()
defer conn.Close()
var key string
if iter.Func == nil {
key = PREFIX + "ID"
} else {
key = PREFIX + string(iter.Func) + ":name"
}
reply, err := redis.Values(conn.Do("ZRANGE", key, start, stop, "WITHSCORES"))
if err != nil || len(reply) == 0 {
return false
}
var jobID int64
jobs := make([]driver.Job, len(reply)/2)
for k, v := range reply {
if k%2 == 1 {
jobID, _ = strconv.ParseInt(string(v.([]byte)), 10, 0)
jobs[(k-1)/2], _ = iter.r.get(jobID)
}
}
iter.cacheJob = jobs
iter.cursor = 0
return true
}
// Value returns the current job.
func (iter *Iterator) Value() driver.Job {
return iter.cacheJob[iter.cursor]
}
// Error returns the current error.
func (iter *Iterator) Error() error {
return iter.err
}
// Close the iterator
func (iter *Iterator) Close() {
iter.r.RWLocker.Unlock()
}