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control_plane.go
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control_plane.go
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// Copyright 2022, OpenSergo Authors
//
// 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 opensergo
import (
"log"
"os"
"sync"
"github.com/opensergo/opensergo-control-plane/pkg/controller"
"github.com/opensergo/opensergo-control-plane/pkg/model"
trpb "github.com/opensergo/opensergo-control-plane/pkg/proto/transport/v1"
transport "github.com/opensergo/opensergo-control-plane/pkg/transport/grpc"
"github.com/pkg/errors"
)
type ControlPlane struct {
operator *controller.KubernetesOperator
server *transport.Server
protoDesc *trpb.ControlPlaneDesc
mux sync.RWMutex
}
func NewControlPlane() (*ControlPlane, error) {
cp := &ControlPlane{}
operator, err := controller.NewKubernetesOperator(cp.sendMessage)
if err != nil {
return nil, err
}
cp.server = transport.NewServer(uint32(10246), []model.SubscribeRequestHandler{cp.handleSubscribeRequest})
cp.operator = operator
hostname, herr := os.Hostname()
if herr != nil {
// TODO: log here
hostname = "unknown-host"
}
cp.protoDesc = &trpb.ControlPlaneDesc{Identifier: "osg-" + hostname}
return cp, nil
}
func (c *ControlPlane) Start() error {
// Run the Kubernetes operator
err := c.operator.Run()
if err != nil {
return err
}
// Run the transport server
err = c.server.Run()
if err != nil {
return err
}
return nil
}
func (c *ControlPlane) sendMessage(namespace, app, kind string, dataWithVersion *trpb.DataWithVersion, status *trpb.Status, respId string) error {
connections, exists := c.server.ConnectionManager().Get(namespace, app, kind)
if !exists || connections == nil {
return errors.New("There is no connection for this kind")
}
for _, connection := range connections {
if connection == nil || !connection.IsValid() {
// TODO: log.Debug
continue
}
err := c.sendMessageToStream(connection.Stream(), namespace, app, kind, dataWithVersion, status, respId)
if err != nil {
// TODO: should not short-break here. Handle partial failure here.
return err
}
}
return nil
}
func (c *ControlPlane) sendMessageToStream(stream model.OpenSergoTransportStream, namespace, app, kind string, dataWithVersion *trpb.DataWithVersion, status *trpb.Status, respId string) error {
if stream == nil {
return nil
}
return stream.SendMsg(&trpb.SubscribeResponse{
Status: status,
Ack: "",
Namespace: namespace,
App: app,
Kind: kind,
DataWithVersion: dataWithVersion,
ControlPlane: c.protoDesc,
ResponseId: respId,
})
}
func (c *ControlPlane) handleSubscribeRequest(clientIdentifier model.ClientIdentifier, request *trpb.SubscribeRequest, stream model.OpenSergoTransportStream) error {
// var labels []model.LabelKV
// if request.Target.Labels != nil {
// for _, label := range request.Target.Labels {
// labels = append(labels, model.LabelKV{
// Key: label.Key,
// Value: label.Value,
// })
// }
// }
for _, kind := range request.Target.Kinds {
crdWatcher, err := c.operator.RegisterWatcher(model.SubscribeTarget{
Namespace: request.Target.Namespace,
AppName: request.Target.App,
Kind: kind,
})
if err != nil {
status := &trpb.Status{
Code: transport.RegisterWatcherError,
Message: "Register watcher error",
Details: nil,
}
err = c.sendMessageToStream(stream, request.Target.Namespace, request.Target.App, kind, nil, status, request.RequestId)
if err != nil {
// TODO: log here
log.Printf("sendMessageToStream failed, err=%s\n", err.Error())
}
continue
}
_ = c.server.ConnectionManager().Add(request.Target.Namespace, request.Target.App, kind, transport.NewConnection(clientIdentifier, stream))
// send if the watcher cache is not empty
rules, version := crdWatcher.GetRules(model.NamespacedApp{
Namespace: request.Target.Namespace,
App: request.Target.App,
})
if len(rules) > 0 {
status := &trpb.Status{
Code: transport.Success,
Message: "Get and send rule success",
Details: nil,
}
dataWithVersion := &trpb.DataWithVersion{
Data: rules,
Version: version,
}
err = c.sendMessageToStream(stream, request.Target.Namespace, request.Target.App, kind, dataWithVersion, status, request.RequestId)
if err != nil {
// TODO: log here
log.Printf("sendMessageToStream failed, err=%s\n", err.Error())
}
}
}
return nil
}