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96 lines
2.5 KiB
Go
96 lines
2.5 KiB
Go
// +build ignore
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/*
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Copyright 2016 The Go4 Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// The serve_on_cloud program deploys an HTTP server on Google Compute Engine,
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// serving from Google Cloud Storage. Its purpose is to help testing
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// go4.org/cloud/cloudlaunch and go4.org/wkfs/gcs.
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package main
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import (
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"flag"
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"fmt"
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"log"
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"net/http"
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"os"
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"path"
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"regexp"
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"time"
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"go4.org/cloud/cloudlaunch"
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"go4.org/wkfs"
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_ "go4.org/wkfs/gcs"
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"cloud.google.com/go/compute/metadata"
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storageapi "google.golang.org/api/storage/v1"
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compute "google.golang.org/api/compute/v1"
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)
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var httpAddr = flag.String("http", ":80", "HTTP address")
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var gcsBucket string
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func serveHTTP(w http.ResponseWriter, r *http.Request) {
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rc, err := wkfs.Open(path.Join("/gcs", gcsBucket, r.URL.Path))
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if err != nil {
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http.Error(w, fmt.Sprintf("could not open %v: %v", r.URL.Path, err), 500)
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return
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}
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defer rc.Close()
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http.ServeContent(w, r, r.URL.Path, time.Now(), rc)
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}
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func main() {
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if !metadata.OnGCE() {
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bucket := os.Getenv("GCSBUCKET")
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if bucket == "" {
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log.Fatal("You need to set the GCSBUCKET env var to specify the Google Cloud Storage bucket to serve from.")
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}
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projectID := os.Getenv("GCEPROJECTID")
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if projectID == "" {
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log.Fatal("You need to set the GCEPROJECTID env var to specify the Google Cloud project where the instance will run.")
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}
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(&cloudlaunch.Config{
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Name: "serveoncloud",
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BinaryBucket: bucket,
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GCEProjectID: projectID,
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Scopes: []string{
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storageapi.DevstorageFullControlScope,
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compute.ComputeScope,
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},
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}).MaybeDeploy()
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return
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}
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flag.Parse()
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storageURLRxp := regexp.MustCompile(`https://storage.googleapis.com/(.+?)/serveoncloud.*`)
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cloudConfig, err := metadata.InstanceAttributeValue("user-data")
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if err != nil || cloudConfig == "" {
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log.Fatalf("could not get cloud config from metadata: %v", err)
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}
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m := storageURLRxp.FindStringSubmatch(cloudConfig)
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if len(m) < 2 {
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log.Fatal("storage URL not found in cloud config")
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}
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gcsBucket = m[1]
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http.HandleFunc("/", serveHTTP)
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log.Fatal(http.ListenAndServe(*httpAddr, nil))
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}
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