Mercurial > gemma
annotate pkg/misc/tmpfiles.go @ 1228:17131f0f9fcb
Added endpoint to explicitly delete a temp upload.
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Mon, 19 Nov 2018 18:32:06 +0100 |
parents | bc4b642c8d04 |
children | 5b9b8eabcd01 |
rev | line source |
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1 // This is Free Software under GNU Affero General Public License v >= 3.0 |
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2 // without warranty, see README.md and license for details. |
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3 // |
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4 // SPDX-License-Identifier: AGPL-3.0-or-later |
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5 // License-Filename: LICENSES/AGPL-3.0.txt |
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6 // |
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7 // Copyright (C) 2018 by via donau |
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8 // – Österreichische Wasserstraßen-Gesellschaft mbH |
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9 // Software engineering by Intevation GmbH |
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10 // |
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11 // Author(s): |
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12 // * Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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13 |
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14 package misc |
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15 |
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16 import ( |
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17 "encoding/hex" |
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18 "log" |
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19 "os" |
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20 "path/filepath" |
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21 "sort" |
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22 "sync" |
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23 "time" |
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24 |
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25 "gemma.intevation.de/gemma/pkg/common" |
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26 "gemma.intevation.de/gemma/pkg/config" |
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27 ) |
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28 |
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29 const ( |
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30 tmpFilesDir = "tmpfiles" |
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31 maxTmpFiles = 100 |
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32 maxTmpFileAge = 45 * time.Minute |
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33 tmpfilesCleanUp = 15 * time.Minute |
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34 ) |
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35 |
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36 var tmpfilesMu sync.Mutex |
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37 |
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38 func init() { |
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39 go func() { |
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40 config.WaitReady() |
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41 for { |
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42 if err := cleanupTmpFiles(); err != nil { |
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43 log.Printf("error: %v\n", err) |
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44 } |
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45 time.Sleep(tmpfilesCleanUp) |
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46 } |
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47 }() |
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48 } |
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49 |
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50 func tmpfilesDir() string { |
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51 dir := config.TmpDir() |
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52 if dir == "" { |
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53 dir = os.TempDir() |
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54 } |
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55 return filepath.Join(dir, tmpFilesDir) |
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56 } |
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57 |
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58 func cleanupTmpFiles() error { |
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59 tmpfilesMu.Lock() |
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60 defer tmpfilesMu.Unlock() |
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61 |
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62 tmp := tmpfilesDir() |
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63 |
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64 _, err := os.Stat(tmp) |
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65 switch { |
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66 case os.IsNotExist(err): |
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67 return nil |
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68 case err != nil: |
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69 return err |
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70 } |
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71 |
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72 f, err := os.Open(tmp) |
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73 if err != nil { |
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74 return err |
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75 } |
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76 |
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77 files, err := f.Readdir(-1) |
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78 f.Close() |
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79 if err != nil { |
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80 return err |
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81 } |
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82 |
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83 bestBefore := time.Now().Add(-maxTmpFileAge) |
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84 |
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85 var errs []error |
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86 var deleted int |
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87 |
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88 for _, fi := range files { |
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89 if fi.ModTime().Before(bestBefore) { |
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90 fname := filepath.Join(tmp, fi.Name()) |
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91 if err := os.RemoveAll(fname); err != nil { |
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92 errs = append(errs, err) |
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93 } else { |
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94 deleted++ |
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95 } |
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96 } |
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97 } |
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98 |
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99 // If empty remove temp folder. |
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100 if deleted == len(files) { |
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101 if err := os.RemoveAll(tmp); err != nil { |
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102 errs = append(errs, err) |
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103 } |
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104 } |
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105 |
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106 if len(errs) > 0 { |
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107 return common.ToError(errs) |
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108 } |
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109 |
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110 return nil |
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111 } |
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112 |
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113 func DeleteTempFile(token string) error { |
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114 tmpfilesMu.Lock() |
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115 defer tmpfilesMu.Unlock() |
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116 tmp := tmpfilesDir() |
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117 return os.RemoveAll(filepath.Join(tmp, token)) |
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118 } |
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119 |
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120 func UnmakeTempFile(token, path string) error { |
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121 tmpfilesMu.Lock() |
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122 defer tmpfilesMu.Unlock() |
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123 tmp := tmpfilesDir() |
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124 return os.Rename(filepath.Join(tmp, token), path) |
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125 } |
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126 |
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127 func MakeTempFile(fname string) (string, error) { |
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128 tmpfilesMu.Lock() |
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129 defer tmpfilesMu.Unlock() |
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130 |
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131 tmp := tmpfilesDir() |
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132 |
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133 _, err := os.Stat(tmp) |
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134 switch { |
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135 case os.IsNotExist(err): |
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136 if err := os.MkdirAll(tmp, 0700); err != nil { |
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137 return "", err |
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138 } |
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139 case err != nil: |
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140 return "", err |
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141 } |
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142 |
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143 f, err := os.Open(tmp) |
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144 if err != nil { |
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145 return "", err |
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146 } |
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147 |
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148 files, err := f.Readdir(-1) |
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149 f.Close() |
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150 if err != nil { |
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151 return "", err |
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152 } |
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153 |
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154 // If there are too many throw away old. |
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155 if len(files) >= maxTmpFiles { |
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156 sort.Slice(files, func(i, j int) bool { |
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157 return files[i].ModTime().Before(files[j].ModTime()) |
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158 }) |
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159 |
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160 var errs []error |
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161 for len(files) >= maxTmpFiles { |
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162 fname := filepath.Join(tmp, files[0].Name()) |
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163 if err := os.RemoveAll(fname); err != nil { |
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164 errs = append(errs, err) |
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165 } |
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166 files = files[1:] |
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167 } |
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168 if len(errs) > 0 { |
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169 return "", common.ToError(errs) |
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170 } |
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171 } |
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172 |
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173 var token string |
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174 again: |
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175 token = generateToken() |
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176 for _, f := range files { |
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177 if f.Name() == token { |
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178 goto again |
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179 } |
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180 } |
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181 err = os.Rename(fname, filepath.Join(tmp, token)) |
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182 return token, err |
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183 } |
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184 |
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185 func generateToken() string { |
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186 return hex.EncodeToString(common.GenerateRandomKey(20)) |
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187 } |