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package broadcast
import (
"fmt"
"sync"
endure "github.com/spiral/endure/pkg/container"
"github.com/spiral/errors"
"github.com/spiral/roadrunner/v2/pkg/pubsub"
"github.com/spiral/roadrunner/v2/plugins/config"
"github.com/spiral/roadrunner/v2/plugins/logger"
websocketsv1beta "github.com/spiral/roadrunner/v2/proto/websockets/v1beta"
"google.golang.org/protobuf/proto"
)
const (
PluginName string = "broadcast"
// driver is the mandatory field which should present in every storage
driver string = "driver"
redis string = "redis"
memory string = "memory"
)
type Plugin struct {
sync.RWMutex
cfg *Config
cfgPlugin config.Configurer
log logger.Logger
// publishers implement Publisher interface
// and able to receive a payload
publishers map[string]pubsub.PubSub
constructors map[string]pubsub.Constructor
}
func (p *Plugin) Init(cfg config.Configurer, log logger.Logger) error {
const op = errors.Op("broadcast_plugin_init")
if !cfg.Has(PluginName) {
return errors.E(op, errors.Disabled)
}
p.cfg = &Config{}
// unmarshal config section
err := cfg.UnmarshalKey(PluginName, &p.cfg.Data)
if err != nil {
return errors.E(op, err)
}
p.publishers = make(map[string]pubsub.PubSub)
p.constructors = make(map[string]pubsub.Constructor)
p.log = log
p.cfgPlugin = cfg
return nil
}
func (p *Plugin) Serve() chan error {
const op = errors.Op("broadcast_plugin_serve")
errCh := make(chan error, 1)
// iterate over config
for k, v := range p.cfg.Data {
if v == nil {
continue
}
// check type of the v
// should be a map[string]interface{}
switch t := v.(type) {
// correct type
case map[string]interface{}:
if _, ok := t[driver]; !ok {
errCh <- errors.E(op, errors.Errorf("could not find mandatory driver field in the %s storage", k))
return errCh
}
default:
errCh <- errors.E(op, errors.Str("wrong type detected in the configuration, please, check yaml indentation"))
return errCh
}
// config key for the particular sub-driver kv.memcached
configKey := fmt.Sprintf("%s.%s", PluginName, k)
switch v.(map[string]interface{})[driver] {
case memory:
if _, ok := p.constructors[memory]; !ok {
p.log.Warn("no memory drivers registered", "registered", p.publishers)
continue
}
ps, err := p.constructors[memory].PSConstruct(configKey)
if err != nil {
errCh <- errors.E(op, err)
return errCh
}
// save the pubsub
p.publishers[k] = ps
case redis:
if _, ok := p.constructors[redis]; !ok {
p.log.Warn("no redis drivers registered", "registered", p.publishers)
continue
}
// first - try local configuration
switch {
case p.cfgPlugin.Has(configKey):
ps, err := p.constructors[redis].PSConstruct(configKey)
if err != nil {
errCh <- errors.E(op, err)
return errCh
}
// save the pubsub
p.publishers[k] = ps
case p.cfgPlugin.Has(redis):
ps, err := p.constructors[redis].PSConstruct(configKey)
if err != nil {
errCh <- errors.E(op, err)
return errCh
}
// save the pubsub
p.publishers[k] = ps
continue
}
}
}
return errCh
}
func (p *Plugin) Stop() error {
return nil
}
func (p *Plugin) Collects() []interface{} {
return []interface{}{
p.CollectPublishers,
}
}
// CollectPublishers collect all plugins who implement pubsub.Publisher interface
func (p *Plugin) CollectPublishers(name endure.Named, subscriber pubsub.Constructor) {
// key redis, value - interface
p.constructors[name.Name()] = subscriber
}
// Publish is an entry point to the websocket PUBSUB
func (p *Plugin) Publish(m []byte) error {
p.Lock()
defer p.Unlock()
const op = errors.Op("broadcast_plugin_publish")
msg := &websocketsv1beta.Message{}
err := proto.Unmarshal(m, msg)
if err != nil {
return errors.E(op, err)
}
// Get payload
for i := 0; i < len(msg.GetTopics()); i++ {
if len(p.publishers) > 0 {
for j := range p.publishers {
err = p.publishers[j].Publish(m)
if err != nil {
return errors.E(op, err)
}
}
return nil
}
p.log.Warn("no publishers registered")
}
return nil
}
func (p *Plugin) PublishAsync(m []byte) {
go func() {
p.Lock()
defer p.Unlock()
msg := &websocketsv1beta.Message{}
err := proto.Unmarshal(m, msg)
if err != nil {
p.log.Error("message unmarshal")
}
// Get payload
for i := 0; i < len(msg.GetTopics()); i++ {
if len(p.publishers) > 0 {
for j := range p.publishers {
p.publishers[j].PublishAsync(m)
}
return
}
p.log.Warn("no publishers registered")
}
}()
}
func (p *Plugin) GetDriver(key string) (pubsub.SubReader, error) {
const op = errors.Op("broadcast_plugin_get_driver")
// key - driver, default for example
// we should find `default` in the collected pubsubs constructors
if pub, ok := p.publishers[key]; ok {
return pub, nil
}
return nil, errors.E(op, errors.Str("could not find driver by provided key"))
}
func (p *Plugin) RPC() interface{} {
return &rpc{
plugin: p,
log: p.log,
}
}
func (p *Plugin) Name() string {
return PluginName
}
func (p *Plugin) Available() {}
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