Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/boltons/mboxutils.py @ 0:4f3585e2f14b draft default tip
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 # -*- coding: utf-8 -*- |
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2 """Useful utilities for working with the `mbox`_-formatted |
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3 mailboxes. Credit to Mark Williams for these. |
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4 |
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5 .. _mbox: https://en.wikipedia.org/wiki/Mbox |
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6 """ |
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7 |
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8 import mailbox |
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9 import tempfile |
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10 |
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11 |
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12 DEFAULT_MAXMEM = 4 * 1024 * 1024 # 4MB |
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13 |
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14 |
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15 class mbox_readonlydir(mailbox.mbox): |
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16 """A subclass of :class:`mailbox.mbox` suitable for use with mboxs |
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17 insides a read-only mail directory, e.g., ``/var/mail``. Otherwise |
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18 the API is exactly the same as the built-in mbox. |
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19 |
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20 Deletes messages via truncation, in the manner of `Heirloom mailx`_. |
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21 |
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22 Args: |
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23 path (str): Path to the mbox file. |
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24 factory (type): Message type (defaults to :class:`rfc822.Message`) |
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25 create (bool): Create mailbox if it does not exist. (defaults |
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26 to ``True``) |
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27 maxmem (int): Specifies, in bytes, the largest sized mailbox |
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28 to attempt to copy into memory. Larger mailboxes |
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29 will be copied incrementally which is more |
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30 hazardous. (defaults to 4MB) |
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31 |
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32 .. note:: |
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33 |
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34 Because this truncates and rewrites parts of the mbox file, |
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35 this class can corrupt your mailbox. Only use this if you know |
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36 the built-in :class:`mailbox.mbox` does not work for your use |
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37 case. |
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38 |
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39 .. _Heirloom mailx: http://heirloom.sourceforge.net/mailx.html |
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40 """ |
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41 def __init__(self, path, factory=None, create=True, maxmem=1024 * 1024): |
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42 mailbox.mbox.__init__(self, path, factory, create) |
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43 self.maxmem = maxmem |
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44 |
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45 def flush(self): |
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46 """Write any pending changes to disk. This is called on mailbox |
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47 close and is usually not called explicitly. |
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48 |
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49 .. note:: |
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50 |
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51 This deletes messages via truncation. Interruptions may |
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52 corrupt your mailbox. |
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53 """ |
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54 |
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55 # Appending and basic assertions are the same as in mailbox.mbox.flush. |
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56 if not self._pending: |
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57 if self._pending_sync: |
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58 # Messages have only been added, so syncing the file |
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59 # is enough. |
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60 mailbox._sync_flush(self._file) |
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61 self._pending_sync = False |
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62 return |
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63 |
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64 # In order to be writing anything out at all, self._toc must |
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65 # already have been generated (and presumably has been modified |
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66 # by adding or deleting an item). |
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67 assert self._toc is not None |
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68 |
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69 # Check length of self._file; if it's changed, some other process |
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70 # has modified the mailbox since we scanned it. |
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71 self._file.seek(0, 2) |
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72 cur_len = self._file.tell() |
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73 if cur_len != self._file_length: |
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74 raise mailbox.ExternalClashError('Size of mailbox file changed ' |
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75 '(expected %i, found %i)' % |
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76 (self._file_length, cur_len)) |
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77 |
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78 self._file.seek(0) |
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79 |
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80 # Truncation logic begins here. Mostly the same except we |
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81 # can use tempfile because we're not doing rename(2). |
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82 with tempfile.TemporaryFile() as new_file: |
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83 new_toc = {} |
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84 self._pre_mailbox_hook(new_file) |
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85 for key in sorted(self._toc.keys()): |
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86 start, stop = self._toc[key] |
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87 self._file.seek(start) |
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88 self._pre_message_hook(new_file) |
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89 new_start = new_file.tell() |
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90 while True: |
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91 buffer = self._file.read(min(4096, |
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92 stop - self._file.tell())) |
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93 if buffer == '': |
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94 break |
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95 new_file.write(buffer) |
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96 new_toc[key] = (new_start, new_file.tell()) |
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97 self._post_message_hook(new_file) |
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98 self._file_length = new_file.tell() |
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99 |
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100 self._file.seek(0) |
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101 new_file.seek(0) |
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102 |
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103 # Copy back our messages |
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104 if self._file_length <= self.maxmem: |
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105 self._file.write(new_file.read()) |
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106 else: |
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107 while True: |
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108 buffer = new_file.read(4096) |
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109 if not buffer: |
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110 break |
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111 self._file.write(buffer) |
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112 |
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113 # Delete the rest. |
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114 self._file.truncate() |
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115 |
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116 # Same wrap up. |
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117 self._toc = new_toc |
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118 self._pending = False |
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119 self._pending_sync = False |
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120 if self._locked: |
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121 mailbox._lock_file(self._file, dotlock=False) |