Mercurial > gemma
view pkg/misc/tmpfiles.go @ 3726:be939dcdfdfd
client: waterlevel diagrams: make now line label not update its position when zooming
Of course the line and label could both be updated and move with the time but since all other data is static after generating
the diagram once, a moving now line would be to fancy... but I was tempted.
author | Markus Kottlaender <markus@intevation.de> |
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date | Thu, 20 Jun 2019 19:16:26 +0200 |
parents | 5b9b8eabcd01 |
children | 5f47eeea988d |
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// This is Free Software under GNU Affero General Public License v >= 3.0 // without warranty, see README.md and license for details. // // SPDX-License-Identifier: AGPL-3.0-or-later // License-Filename: LICENSES/AGPL-3.0.txt // // Copyright (C) 2018 by via donau // – Österreichische Wasserstraßen-Gesellschaft mbH // Software engineering by Intevation GmbH // // Author(s): // * Sascha L. Teichmann <sascha.teichmann@intevation.de> package misc import ( "encoding/hex" "log" "os" "path/filepath" "sort" "sync" "time" "gemma.intevation.de/gemma/pkg/common" "gemma.intevation.de/gemma/pkg/config" ) const ( tmpFilesDir = "tmpfiles" maxTmpFiles = 100 maxTmpFileAge = 45 * time.Minute tmpfilesCleanUp = 15 * time.Minute ) var tmpfilesMu sync.Mutex func init() { go func() { config.WaitReady() for { if err := cleanupTmpFiles(); err != nil { log.Printf("error: %v\n", err) } time.Sleep(tmpfilesCleanUp) } }() } func tmpfilesDir() string { dir := config.TmpDir() if dir == "" { dir = os.TempDir() } return filepath.Join(dir, tmpFilesDir) } func cleanupTmpFiles() error { tmpfilesMu.Lock() defer tmpfilesMu.Unlock() tmp := tmpfilesDir() _, err := os.Stat(tmp) switch { case os.IsNotExist(err): return nil case err != nil: return err } f, err := os.Open(tmp) if err != nil { return err } files, err := f.Readdir(-1) f.Close() if err != nil { return err } bestBefore := time.Now().Add(-maxTmpFileAge) var errs []error var deleted int for _, fi := range files { if fi.ModTime().Before(bestBefore) { fname := filepath.Join(tmp, fi.Name()) if err := os.RemoveAll(fname); err != nil { errs = append(errs, err) } else { deleted++ } } } // If empty remove temp folder. if deleted == len(files) { if err := os.RemoveAll(tmp); err != nil { errs = append(errs, err) } } if len(errs) > 0 { return common.ToError(errs) } return nil } // DeleteTempFile deletes a file identified by its token // from the special folder of temporary files. func DeleteTempFile(token string) error { tmpfilesMu.Lock() defer tmpfilesMu.Unlock() tmp := tmpfilesDir() return os.RemoveAll(filepath.Join(tmp, token)) } // UnmakeTempFile moves a file identified by a token // back from the special folder to a normal path. // This only will succeed if the token is not expired. func UnmakeTempFile(token, path string) error { tmpfilesMu.Lock() defer tmpfilesMu.Unlock() tmp := tmpfilesDir() return os.Rename(filepath.Join(tmp, token), path) } // MakeTempFile moves a file into a special temporary file folder // and returns a token for later accessing the file again. // Files in this special folder are only quaranteed to be // kept alive among of time. After this time expires file // will be likely to be deleted. There are only a limited // amount of temporary files allowed. If you push more // files into the special folder the oldest will be erased. func MakeTempFile(fname string) (string, error) { tmpfilesMu.Lock() defer tmpfilesMu.Unlock() tmp := tmpfilesDir() _, err := os.Stat(tmp) switch { case os.IsNotExist(err): if err := os.MkdirAll(tmp, 0700); err != nil { return "", err } case err != nil: return "", err } f, err := os.Open(tmp) if err != nil { return "", err } files, err := f.Readdir(-1) f.Close() if err != nil { return "", err } // If there are too many throw away old. if len(files) >= maxTmpFiles { sort.Slice(files, func(i, j int) bool { return files[i].ModTime().Before(files[j].ModTime()) }) var errs []error for len(files) >= maxTmpFiles { fname := filepath.Join(tmp, files[0].Name()) if err := os.RemoveAll(fname); err != nil { errs = append(errs, err) } files = files[1:] } if len(errs) > 0 { return "", common.ToError(errs) } } var token string again: token = generateToken() for _, f := range files { if f.Name() == token { goto again } } err = os.Rename(fname, filepath.Join(tmp, token)) return token, err } func generateToken() string { return hex.EncodeToString(common.GenerateRandomKey(20)) }