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cloudinit.go
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cloudinit.go
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/*
* 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.
*
* Copyright 2019 StackPath, LLC
*
*/
// Inspired by cmd/example-hook-sidecar
package main
import (
"context"
"encoding/json"
"fmt"
"net"
"os"
"google.golang.org/grpc"
v1 "kubevirt.io/kubevirt/pkg/api/v1"
hooks "kubevirt.io/kubevirt/pkg/hooks"
hooksInfo "kubevirt.io/kubevirt/pkg/hooks/info"
hooksV1alpha2 "kubevirt.io/kubevirt/pkg/hooks/v1alpha2"
"kubevirt.io/kubevirt/pkg/log"
)
type infoServer struct{}
func (s infoServer) Info(ctx context.Context, params *hooksInfo.InfoParams) (*hooksInfo.InfoResult, error) {
log.Log.Info("Hook's Info method has been called")
return &hooksInfo.InfoResult{
Name: "cloudinit",
Versions: []string{
hooksV1alpha2.Version,
},
HookPoints: []*hooksInfo.HookPoint{
&hooksInfo.HookPoint{
Name: hooksInfo.PreCloudInitIsoHookPointName,
Priority: 0,
},
},
}, nil
}
type v1alpha2Server struct{}
func (s v1alpha2Server) OnDefineDomain(ctx context.Context, params *hooksV1alpha2.OnDefineDomainParams) (*hooksV1alpha2.OnDefineDomainResult, error) {
log.Log.Warning("Hook's OnDefineDomain callback method has been called which should never happen")
return &hooksV1alpha2.OnDefineDomainResult{
DomainXML: params.GetDomainXML(),
}, nil
}
func (s v1alpha2Server) PreCloudInitIso(ctx context.Context, params *hooksV1alpha2.PreCloudInitIsoParams) (*hooksV1alpha2.PreCloudInitIsoResult, error) {
log.Log.Info("Hook's PreCloudInitIso callback method has been called")
vmiJSON := params.GetVmi()
vmi := v1.VirtualMachineInstance{}
err := json.Unmarshal(vmiJSON, &vmi)
if err != nil {
log.Log.Reason(err).Errorf("Failed to unmarshal given VMI spec: %s", vmiJSON)
panic(err)
}
cloudInitDataJSON := params.GetCloudInitData()
cloudInitData := v1.CloudInitNoCloudSource{}
err = json.Unmarshal(cloudInitDataJSON, &cloudInitData)
if err != nil {
log.Log.Reason(err).Errorf("Failed to unmarshal given CloudInitNoCloudSource: %s", cloudInitDataJSON)
panic(err)
}
cloudInitData.UserData = "#cloud-config\n"
cloudInitData.UserDataBase64 = ""
response, err := json.Marshal(cloudInitData)
if err != nil {
return &hooksV1alpha2.PreCloudInitIsoResult{
CloudInitData: params.GetCloudInitData(),
}, fmt.Errorf("Failed to marshal CloudInitNoCloudSource: %v", cloudInitData)
}
return &hooksV1alpha2.PreCloudInitIsoResult{
CloudInitData: response,
}, nil
}
func main() {
log.InitializeLogging("cloudinit-hook-sidecar")
socketPath := hooks.HookSocketsSharedDirectory + "/cloudinit.sock"
socket, err := net.Listen("unix", socketPath)
if err != nil {
log.Log.Reason(err).Errorf("Failed to initialized socket on path: %s", socket)
log.Log.Error("Check whether given directory exists and socket name is not already taken by other file")
panic(err)
}
defer os.Remove(socketPath)
server := grpc.NewServer([]grpc.ServerOption{}...)
hooksInfo.RegisterInfoServer(server, infoServer{})
hooksV1alpha2.RegisterCallbacksServer(server, v1alpha2Server{})
log.Log.Infof("Starting hook server exposing 'info' and 'v1alpha2' services on socket %s", socketPath)
server.Serve(socket)
}