helloworld-shell/invoke.go

// Copyright 2019 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
//
//     https://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.

// [START cloudrun_helloworld_server]
// [START run_helloworld_server]

// Sample helloworld-shell is a Cloud Run shell-script-as-a-service.
package main

import (
	"log"
	"net/http"
	"os"
	"os/exec"
)

func main() {
	http.HandleFunc("/", scriptHandler)

	// Determine port for HTTP service.
	port := os.Getenv("PORT")
	if port == "" {
		port = "8080"
		log.Printf("Defaulting to port %s", port)
	}

	// Start HTTP server.
	log.Printf("Listening on port %s", port)
	if err := http.ListenAndServe(":"+port, nil); err != nil {
		log.Fatal(err)
	}
}

func scriptHandler(w http.ResponseWriter, r *http.Request) {
	cmd := exec.CommandContext(r.Context(), "/bin/bash", "script.sh")
	cmd.Stderr = os.Stderr
	out, err := cmd.Output()
	if err != nil {
		w.WriteHeader(500)
	}
	w.Write(out)
}

// [END run_helloworld_server]
// [END cloudrun_helloworld_server]