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plugin_impl_redis.go
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/
plugin_impl_redis.go
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// Copyright (c) 2017 Cisco and/or its affiliates.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at:
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package redis
import (
"go.ligato.io/cn-infra/v2/datasync/resync"
"go.ligato.io/cn-infra/v2/db/keyval"
"go.ligato.io/cn-infra/v2/db/keyval/kvproto"
"go.ligato.io/cn-infra/v2/health/statuscheck"
"go.ligato.io/cn-infra/v2/infra"
)
const (
// healthCheckProbeKey is a key used to probe Redis state.
healthCheckProbeKey = "probe-redis-connection"
)
// Plugin implements redis plugin.
type Plugin struct {
Deps
// Plugin is disabled if there is no config file available
disabled bool
// Redis connection encapsulation
connection *BytesConnectionRedis
// Read/Write proto modelled data
protoWrapper *kvproto.ProtoWrapper
}
// Deps lists dependencies of the redis plugin.
type Deps struct {
infra.PluginDeps
StatusCheck statuscheck.PluginStatusWriter
Resync *resync.Plugin // inject
}
// Init retrieves redis configuration and establishes a new connection
// with the redis data store.
// If the configuration file doesn't exist or cannot be read, the returned errora
// will be of os.PathError type. An untyped error is returned in case the file
// doesn't contain a valid YAML configuration.
func (p *Plugin) Init() (err error) {
redisCfg, err := p.getRedisConfig()
if err != nil || p.disabled {
return err
}
// Create client according to config
client, err := ConfigToClient(redisCfg)
if err != nil {
return err
}
// Uses config file to establish connection with the database
p.connection, err = NewBytesConnection(client, p.Log)
if err != nil {
return err
}
p.protoWrapper = kvproto.NewProtoWrapper(p.connection, &keyval.SerializerJSON{})
return nil
}
// AfterInit registers redis to status check if required
func (p *Plugin) AfterInit() error {
if p.StatusCheck != nil && !p.disabled {
p.StatusCheck.Register(p.PluginName, func() (statuscheck.PluginState, error) {
_, _, err := p.NewBroker("/").GetValue(healthCheckProbeKey, nil)
if err == nil {
return statuscheck.OK, nil
}
return statuscheck.Error, err
})
p.Log.Infof("Status check for %s was started", p.PluginName)
}
return nil
}
// Close does nothing for redis plugin.
func (p *Plugin) Close() error {
return nil
}
// NewBroker creates new instance of prefixed broker that provides API with arguments of type proto.Message.
func (p *Plugin) NewBroker(keyPrefix string) keyval.ProtoBroker {
return p.protoWrapper.NewBroker(keyPrefix)
}
// NewWatcher creates new instance of prefixed broker that provides API with arguments of type proto.Message.
func (p *Plugin) NewWatcher(keyPrefix string) keyval.ProtoWatcher {
return p.protoWrapper.NewWatcher(keyPrefix)
}
// Disabled returns *true* if the plugin is not in use due to missing
// redis configuration.
func (p *Plugin) Disabled() (disabled bool) {
return p.disabled
}
// OnConnect executes callback from datasync
func (p *Plugin) OnConnect(callback func() error) {
if err := callback(); err != nil {
p.Log.Error(err)
}
}
func (p *Plugin) getRedisConfig() (cfg interface{}, err error) {
found, _ := p.Cfg.LoadValue(&struct{}{})
if !found {
p.Log.Info("Redis config not found, skip loading this plugin")
p.disabled = true
return
}
configFile := p.Cfg.GetConfigName()
if configFile != "" {
cfg, err = LoadConfig(configFile)
if err != nil {
return
}
}
return
}