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worker.go
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worker.go
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// Copyright 2021 Google LLC
//
// 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 worker
import (
"log"
"fmt"
"net/http"
"os"
"io/ioutil"
"os/exec"
"strings"
"encoding/json"
"cloud.google.com/go/compute/metadata"
)
type WorkerRequest struct {
Resource string
Command string
}
func getAuthToken() (string, error) {
serviceURL := "http://" + os.Getenv("APG_REGISTRY_ADDRESS")
tokenURL := fmt.Sprintf("/instance/service-accounts/default/identity?audience=%s", serviceURL)
idToken, err := metadata.Get(tokenURL)
if err != nil {
log.Printf("metadata.Get: failed to query id_token: %+v", err)
return "", err
}
return idToken, nil
}
func RequestHandler(w http.ResponseWriter, r *http.Request) {
body, err := ioutil.ReadAll(r.Body)
if err != nil{
log.Printf("ioutil.ReadAll: %v", err)
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
req := WorkerRequest{}
if err = json.Unmarshal(body, &req); err != nil {
log.Printf("json.Unmarshal: %v", err)
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
log.Printf("Received Request %s", body)
log.Print("Getting auth token...")
idToken, err := getAuthToken()
if err != nil {
log.Print(err.Error())
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
os.Setenv("APG_REGISTRY_TOKEN", idToken)
split_cmd := strings.Split(req.Command, " ")
args := append(split_cmd[1:], req.Resource)
cmd := exec.Command(split_cmd[0], args...)
var output []byte
output, err = cmd.CombinedOutput()
log.Print(string(output))
if err != nil {
log.Printf("Error executing command: %v", err)
w.Write([]byte("Execution Completed"))
return
}
log.Printf("Execution Completed: \n command: %s \nresource %s", req.Command, req.Resource)
w.Write([]byte("Execution Completed"))
return
}