forked from benmanns/goworker
/
poller.go
151 lines (128 loc) · 2.86 KB
/
poller.go
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package goworker
import (
"bytes"
"encoding/json"
"fmt"
"time"
"github.com/garyburd/redigo/redis"
)
type poller struct {
process
isStrict bool
}
func newPoller(queues []string, isStrict bool) (*poller, error) {
process, err := newProcess("poller", queues)
if err != nil {
return nil, err
}
return &poller{
process: *process,
isStrict: isStrict,
}, nil
}
func (p *poller) getJob(conn redis.Conn) (*job, error) {
for _, queue := range p.queues(p.isStrict) {
logger.Debugf("Checking %s", queue)
reply, err := conn.Do("LPOP", fmt.Sprintf("%squeue:%s", namespace, queue))
if err != nil {
return nil, err
}
if reply != nil {
logger.Debugf("Found job on %s", queue)
job := &job{Queue: queue}
decoder := json.NewDecoder(bytes.NewReader(reply.([]byte)))
if useNumber {
decoder.UseNumber()
}
if err := decoder.Decode(&job.Payload); err != nil {
return nil, err
}
return job, nil
}
}
return nil, nil
}
func (p *poller) beginPolling(interval time.Duration, quit <-chan bool) (<-chan *job, error) {
conn, err := GetConn()
if err != nil {
logger.Criticalf("Error on getting connection to initialize poller %s", p)
return nil, err
}
p.open(conn)
p.start(conn)
PutConn(conn)
jobs := make(chan *job)
go func() {
defer func() {
close(jobs)
conn, err := GetConn()
if err != nil {
logger.Criticalf("Error on getting connection for cleanup in poller %s", p)
return
}
p.finish(conn)
p.close(conn)
PutConn(conn)
}()
for {
select {
case <-quit:
return
default:
conn, err := GetConn()
if err != nil {
logger.Criticalf("Error on getting connection in poller %s", p)
ticker := time.After(interval)
select {
case <-quit:
return
case <-ticker:
continue
}
}
job, err := p.getJob(conn)
if err != nil {
logger.Errorf("Error on %v getting job from %v: %v", p, p.Queues, err)
PutConn(conn)
continue
}
if job != nil {
conn.Send("INCR", fmt.Sprintf("%sstat:processed:%v", namespace, p))
conn.Flush()
PutConn(conn)
select {
case jobs <- job:
case <-quit:
buf, err := json.Marshal(job.Payload)
if err != nil {
logger.Criticalf("Error requeueing %v: %v", job, err)
return
}
conn, err := GetConn()
if err != nil {
logger.Criticalf("Error on getting connection for requeue in poller %s", p)
return
}
conn.Send("LPUSH", fmt.Sprintf("%squeue:%s", namespace, job.Queue), buf)
conn.Flush()
return
}
} else {
PutConn(conn)
if exitOnComplete {
return
}
logger.Debugf("Sleeping for %v", interval)
logger.Debugf("Waiting for %v", p.Queues)
timeout := time.After(interval)
select {
case <-quit:
return
case <-timeout:
}
}
}
}
}()
return jobs, nil
}