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package redis
import (
"context"
"sync"
"github.com/go-redis/redis/v8"
"github.com/spiral/errors"
websocketsv1 "github.com/spiral/roadrunner/v2/pkg/proto/websockets/v1beta"
"github.com/spiral/roadrunner/v2/plugins/config"
"github.com/spiral/roadrunner/v2/plugins/logger"
"google.golang.org/protobuf/proto"
)
const PluginName = "redis"
type Plugin struct {
sync.RWMutex
// config for RR integration
cfg *Config
// logger
log logger.Logger
// redis universal client
universalClient redis.UniversalClient
// fanIn implementation used to deliver messages from all channels to the single websocket point
fanin *FanIn
}
func (p *Plugin) GetClient() redis.UniversalClient {
return p.universalClient
}
func (p *Plugin) Init(cfg config.Configurer, log logger.Logger) error {
const op = errors.Op("redis_plugin_init")
if !cfg.Has(PluginName) {
return errors.E(op, errors.Disabled)
}
err := cfg.UnmarshalKey(PluginName, &p.cfg)
if err != nil {
return errors.E(op, errors.Disabled, err)
}
p.cfg.InitDefaults()
p.log = log
p.universalClient = redis.NewUniversalClient(&redis.UniversalOptions{
Addrs: p.cfg.Addrs,
DB: p.cfg.DB,
Username: p.cfg.Username,
Password: p.cfg.Password,
SentinelPassword: p.cfg.SentinelPassword,
MaxRetries: p.cfg.MaxRetries,
MinRetryBackoff: p.cfg.MaxRetryBackoff,
MaxRetryBackoff: p.cfg.MaxRetryBackoff,
DialTimeout: p.cfg.DialTimeout,
ReadTimeout: p.cfg.ReadTimeout,
WriteTimeout: p.cfg.WriteTimeout,
PoolSize: p.cfg.PoolSize,
MinIdleConns: p.cfg.MinIdleConns,
MaxConnAge: p.cfg.MaxConnAge,
PoolTimeout: p.cfg.PoolTimeout,
IdleTimeout: p.cfg.IdleTimeout,
IdleCheckFrequency: p.cfg.IdleCheckFreq,
ReadOnly: p.cfg.ReadOnly,
RouteByLatency: p.cfg.RouteByLatency,
RouteRandomly: p.cfg.RouteRandomly,
MasterName: p.cfg.MasterName,
})
// init fanin
p.fanin = newFanIn(p.universalClient, log)
return nil
}
func (p *Plugin) Serve() chan error {
errCh := make(chan error)
return errCh
}
func (p *Plugin) Stop() error {
const op = errors.Op("redis_plugin_stop")
err := p.fanin.stop()
if err != nil {
return errors.E(op, err)
}
err = p.universalClient.Close()
if err != nil {
return errors.E(op, err)
}
return nil
}
func (p *Plugin) Name() string {
return PluginName
}
// Available interface implementation
func (p *Plugin) Available() {}
func (p *Plugin) Publish(msg []byte) error {
p.Lock()
defer p.Unlock()
m := &websocketsv1.Message{}
err := proto.Unmarshal(msg, m)
if err != nil {
return errors.E(err)
}
for j := 0; j < len(m.GetTopics()); j++ {
f := p.universalClient.Publish(context.Background(), m.GetTopics()[j], msg)
if f.Err() != nil {
return f.Err()
}
}
return nil
}
func (p *Plugin) PublishAsync(msg []byte) {
go func() {
p.Lock()
defer p.Unlock()
m := &websocketsv1.Message{}
err := proto.Unmarshal(msg, m)
if err != nil {
p.log.Error("message unmarshal error")
return
}
for j := 0; j < len(m.GetTopics()); j++ {
f := p.universalClient.Publish(context.Background(), m.GetTopics()[j], msg)
if f.Err() != nil {
p.log.Error("redis publish", "error", f.Err())
}
}
}()
}
func (p *Plugin) 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", "connectionID", connectionID, "topic", topics[i])
continue
}
}
// and subscribe after
return p.fanin.sub(topics...)
}
func (p *Plugin) 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.fanin.unsub(topics[i])
if err != nil {
return err
}
}
return nil
}
func (p *Plugin) Connections(topic string, res map[string]struct{}) {
hget := p.universalClient.SMembersMap(context.Background(), topic)
r, err := hget.Result()
if err != nil {
panic(err)
}
// assighn connections
// res expected to be from the sync.Pool
for k := range r {
res[k] = struct{}{}
}
}
// Next return next message
func (p *Plugin) Next() (*websocketsv1.Message, error) {
return <-p.fanin.consume(), nil
}
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