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package pubsub
import (
"context"
"sync"
"github.com/go-redis/redis/v8"
"github.com/spiral/errors"
"github.com/spiral/roadrunner/v2/common/pubsub"
"github.com/spiral/roadrunner/v2/plugins/config"
"github.com/spiral/roadrunner/v2/plugins/logger"
)
type PubSubDriver struct {
sync.RWMutex
cfg *Config `mapstructure:"redis"`
log logger.Logger
channel *redisChannel
universalClient redis.UniversalClient
stopCh chan struct{}
}
func NewPubSubDriver(log logger.Logger, key string, cfgPlugin config.Configurer, stopCh chan struct{}) (*PubSubDriver, error) {
const op = errors.Op("new_pub_sub_driver")
ps := &PubSubDriver{
log: log,
stopCh: stopCh,
}
// will be different for every connected driver
err := cfgPlugin.UnmarshalKey(key, &ps.cfg)
if err != nil {
return nil, errors.E(op, err)
}
ps.cfg.InitDefaults()
ps.universalClient = redis.NewUniversalClient(&redis.UniversalOptions{
Addrs: ps.cfg.Addrs,
DB: ps.cfg.DB,
Username: ps.cfg.Username,
Password: ps.cfg.Password,
SentinelPassword: ps.cfg.SentinelPassword,
MaxRetries: ps.cfg.MaxRetries,
MinRetryBackoff: ps.cfg.MaxRetryBackoff,
MaxRetryBackoff: ps.cfg.MaxRetryBackoff,
DialTimeout: ps.cfg.DialTimeout,
ReadTimeout: ps.cfg.ReadTimeout,
WriteTimeout: ps.cfg.WriteTimeout,
PoolSize: ps.cfg.PoolSize,
MinIdleConns: ps.cfg.MinIdleConns,
MaxConnAge: ps.cfg.MaxConnAge,
PoolTimeout: ps.cfg.PoolTimeout,
IdleTimeout: ps.cfg.IdleTimeout,
IdleCheckFrequency: ps.cfg.IdleCheckFreq,
ReadOnly: ps.cfg.ReadOnly,
RouteByLatency: ps.cfg.RouteByLatency,
RouteRandomly: ps.cfg.RouteRandomly,
MasterName: ps.cfg.MasterName,
})
statusCmd := ps.universalClient.Ping(context.Background())
if statusCmd.Err() != nil {
return nil, statusCmd.Err()
}
ps.channel = newRedisChannel(ps.universalClient, log)
ps.stop()
return ps, nil
}
func (p *PubSubDriver) stop() {
go func() {
for range p.stopCh {
_ = p.channel.stop()
return
}
}()
}
func (p *PubSubDriver) Publish(msg *pubsub.Message) error {
p.Lock()
defer p.Unlock()
f := p.universalClient.Publish(context.Background(), msg.Topic, msg.Payload)
if f.Err() != nil {
return f.Err()
}
return nil
}
func (p *PubSubDriver) PublishAsync(msg *pubsub.Message) {
go func() {
p.Lock()
defer p.Unlock()
f := p.universalClient.Publish(context.Background(), msg.Topic, msg.Payload)
if f.Err() != nil {
p.log.Error("redis publish", "error", f.Err())
}
}()
}
func (p *PubSubDriver) Subscribe(connectionID string, topics ...string) error {
// just add a connection
for i := 0; i < len(topics); i++ {
// key - topic
// value - connectionID
hset := p.universalClient.SAdd(context.Background(), topics[i], connectionID)
res, err := hset.Result()
if err != nil {
return err
}
if res == 0 {
p.log.Warn("could not subscribe to the provided topic, you might be already subscribed to it", "connectionID", connectionID, "topic", topics[i])
continue
}
}
// and subscribe after
return p.channel.sub(topics...)
}
func (p *PubSubDriver) Unsubscribe(connectionID string, topics ...string) error {
// Remove topics from the storage
for i := 0; i < len(topics); i++ {
srem := p.universalClient.SRem(context.Background(), topics[i], connectionID)
if srem.Err() != nil {
return srem.Err()
}
}
for i := 0; i < len(topics); i++ {
// if there are no such topics, we can safely unsubscribe from the redis
exists := p.universalClient.Exists(context.Background(), topics[i])
res, err := exists.Result()
if err != nil {
return err
}
// if we have associated connections - skip
if res == 1 { // exists means that topic still exists and some other nodes may have connections associated with it
continue
}
// else - unsubscribe
err = p.channel.unsub(topics[i])
if err != nil {
return err
}
}
return nil
}
func (p *PubSubDriver) Connections(topic string, res map[string]struct{}) {
hget := p.universalClient.SMembersMap(context.Background(), topic)
r, err := hget.Result()
if err != nil {
panic(err)
}
// assign connections
// res expected to be from the sync.Pool
for k := range r {
res[k] = struct{}{}
}
}
// Next return next message
func (p *PubSubDriver) Next(ctx context.Context) (*pubsub.Message, error) {
const op = errors.Op("redis_driver_next")
select {
case msg := <-p.channel.message():
return msg, nil
case <-ctx.Done():
return nil, errors.E(op, errors.TimeOut, ctx.Err())
}
}
|
