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Go appengine : csv upload(blob) & parse. 2018/06/28 change import to "context" and "google.golang.org/appengine/*"
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| package main | |
| import ( | |
| "context" | |
| "html/template" | |
| "io" | |
| "net/http" | |
| "encoding/csv" | |
| "strings" | |
| "google.golang.org/appengine" | |
| "google.golang.org/appengine/blobstore" | |
| "google.golang.org/appengine/log" | |
| ) | |
| func serveError(ctx context.Context, w http.ResponseWriter, err error) { | |
| w.WriteHeader(http.StatusInternalServerError) | |
| w.Header().Set("Content-Type", "text/plain") | |
| io.WriteString(w, "Internal Server Error") | |
| log.Errorf(ctx, "%v", err) | |
| } | |
| var rootTemplate = template.Must(template.New("root").Parse(rootTemplateHTML)) | |
| const rootTemplateHTML = ` | |
| <html><body> | |
| <form action="{{.}}" method="POST" enctype="multipart/form-data"> | |
| Upload CSV File: <input type="file" name="file"><br> | |
| <input type="submit" name="submit" value="Submit"> | |
| </form></body></html> | |
| ` | |
| func handleRoot(w http.ResponseWriter, r *http.Request) { | |
| ctx := appengine.NewContext(r) | |
| uploadURL, err := blobstore.UploadURL(ctx, "/upload", nil) | |
| if err != nil { | |
| serveError(ctx, w, err) | |
| return | |
| } | |
| w.Header().Set("Content-Type", "text/html") | |
| err = rootTemplate.Execute(w, uploadURL) | |
| if err != nil { | |
| log.Errorf(ctx, "%v", err) | |
| } | |
| } | |
| func handleServe(w http.ResponseWriter, r *http.Request) { | |
| c := appengine.NewContext(r) | |
| bkey := appengine.BlobKey(r.FormValue("blobKey")) | |
| w.Header().Set("Content-Type", "text/plain") | |
| // Blobを取得 | |
| out := blobstore.NewReader(c, bkey) | |
| // csv解析 | |
| data := csv.NewReader(out) | |
| // csv全出力 | |
| cols, err := data.Read() | |
| // 最初の読み込みでエラーが出るなら、Blobは存在しないってよ | |
| if err != nil { | |
| http.Error(w, "blob file doesn't exist", http.StatusNotFound) | |
| return | |
| } | |
| for err == nil { | |
| w.Write([]byte(strings.Join(cols, ","))) | |
| cols, err = data.Read() | |
| } | |
| } | |
| func handleUpload(w http.ResponseWriter, r *http.Request) { | |
| ctx := appengine.NewContext(r) | |
| blobs, _, err := blobstore.ParseUpload(r) | |
| if err != nil { | |
| serveError(ctx, w, err) | |
| return | |
| } | |
| file := blobs["file"] | |
| if len(file) == 0 { | |
| log.Errorf(ctx, "no file uploaded") | |
| http.Redirect(w, r, "/", http.StatusFound) | |
| return | |
| } | |
| http.Redirect(w, r, "/serve/?blobKey="+string(file[0].BlobKey), http.StatusFound) | |
| } | |
| func main() { | |
| http.HandleFunc("/", handleRoot) | |
| http.HandleFunc("/serve/", handleServe) | |
| http.HandleFunc("/upload", handleUpload) | |
| appengine.Main() | |
| } |
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