Mercurial > public > mercurial-scm > hg
annotate hgext/lfs/wireprotolfsserver.py @ 37692:10e5bb9678f4
lfs: gracefully handle aborts on the server when corrupt blobs are detected
The aborts weren't killing the server, but this seems cleaner. I'm not sure if
it matters to handle the remaining IOError in the test like this, for
consistency.
The error code still feels wrong (especially if the client is trying to download
a corrupt blob) but I don't see anything better in the RFCs, and this is already
used elsewhere because the Batch API spec specifically mentioned this as a
"Validation Error".
author | Matt Harbison <matt_harbison@yahoo.com> |
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date | Sun, 25 Feb 2018 14:07:13 -0500 |
parents | 726c4102db9e |
children | 31a0d47d69b3 |
rev | line source |
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1 # wireprotolfsserver.py - lfs protocol server side implementation |
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2 # |
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3 # Copyright 2018 Matt Harbison <matt_harbison@yahoo.com> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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6 # GNU General Public License version 2 or any later version. |
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7 |
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8 from __future__ import absolute_import |
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9 |
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10 import datetime |
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11 import errno |
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12 import json |
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13 import traceback |
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14 |
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15 from mercurial.hgweb import ( |
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16 common as hgwebcommon, |
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17 ) |
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18 |
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19 from mercurial import ( |
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20 pycompat, |
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21 ) |
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22 |
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23 from . import blobstore |
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24 |
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25 HTTP_OK = hgwebcommon.HTTP_OK |
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26 HTTP_CREATED = hgwebcommon.HTTP_CREATED |
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27 HTTP_BAD_REQUEST = hgwebcommon.HTTP_BAD_REQUEST |
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28 HTTP_NOT_FOUND = hgwebcommon.HTTP_NOT_FOUND |
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29 |
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30 def handlewsgirequest(orig, rctx, req, res, checkperm): |
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31 """Wrap wireprotoserver.handlewsgirequest() to possibly process an LFS |
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32 request if it is left unprocessed by the wrapped method. |
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33 """ |
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34 if orig(rctx, req, res, checkperm): |
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35 return True |
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36 |
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37 if not rctx.repo.ui.configbool('experimental', 'lfs.serve'): |
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38 return False |
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39 |
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40 if not req.dispatchpath: |
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41 return False |
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42 |
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43 try: |
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44 if req.dispatchpath == b'.git/info/lfs/objects/batch': |
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45 checkperm(rctx, req, 'pull') |
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46 return _processbatchrequest(rctx.repo, req, res) |
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47 # TODO: reserve and use a path in the proposed http wireprotocol /api/ |
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48 # namespace? |
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49 elif req.dispatchpath.startswith(b'.hg/lfs/objects'): |
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50 return _processbasictransfer(rctx.repo, req, res, |
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51 lambda perm: |
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52 checkperm(rctx, req, perm)) |
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53 return False |
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54 except hgwebcommon.ErrorResponse as e: |
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55 # XXX: copied from the handler surrounding wireprotoserver._callhttp() |
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56 # in the wrapped function. Should this be moved back to hgweb to |
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57 # be a common handler? |
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58 for k, v in e.headers: |
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59 res.headers[k] = v |
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60 res.status = hgwebcommon.statusmessage(e.code, pycompat.bytestr(e)) |
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61 res.setbodybytes(b'0\n%s\n' % pycompat.bytestr(e)) |
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62 return True |
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63 |
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64 def _sethttperror(res, code, message=None): |
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65 res.status = hgwebcommon.statusmessage(code, message=message) |
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66 res.headers[b'Content-Type'] = b'text/plain; charset=utf-8' |
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67 res.setbodybytes(b'') |
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68 |
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69 def _logexception(req): |
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70 """Write information about the current exception to wsgi.errors.""" |
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71 tb = pycompat.sysbytes(traceback.format_exc()) |
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72 errorlog = req.rawenv[r'wsgi.errors'] |
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73 |
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74 uri = b'' |
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75 if req.apppath: |
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76 uri += req.apppath |
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77 uri += b'/' + req.dispatchpath |
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78 |
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79 errorlog.write(b"Exception happened while processing request '%s':\n%s" % |
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80 (uri, tb)) |
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81 |
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82 def _processbatchrequest(repo, req, res): |
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83 """Handle a request for the Batch API, which is the gateway to granting file |
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84 access. |
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85 |
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86 https://github.com/git-lfs/git-lfs/blob/master/docs/api/batch.md |
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87 """ |
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88 |
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89 # Mercurial client request: |
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90 # |
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91 # HOST: localhost:$HGPORT |
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92 # ACCEPT: application/vnd.git-lfs+json |
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93 # ACCEPT-ENCODING: identity |
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94 # USER-AGENT: git-lfs/2.3.4 (Mercurial 4.5.2+1114-f48b9754f04c+20180316) |
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95 # Content-Length: 125 |
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96 # Content-Type: application/vnd.git-lfs+json |
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97 # |
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98 # { |
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99 # "objects": [ |
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100 # { |
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101 # "oid": "31cf...8e5b" |
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102 # "size": 12 |
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103 # } |
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104 # ] |
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105 # "operation": "upload" |
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106 # } |
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107 |
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108 if (req.method != b'POST' |
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109 or req.headers[b'Content-Type'] != b'application/vnd.git-lfs+json' |
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110 or req.headers[b'Accept'] != b'application/vnd.git-lfs+json'): |
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111 # TODO: figure out what the proper handling for a bad request to the |
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112 # Batch API is. |
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113 _sethttperror(res, HTTP_BAD_REQUEST, b'Invalid Batch API request') |
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114 return True |
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115 |
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116 # XXX: specify an encoding? |
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117 lfsreq = json.loads(req.bodyfh.read()) |
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118 |
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119 # If no transfer handlers are explicitly requested, 'basic' is assumed. |
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120 if 'basic' not in lfsreq.get('transfers', ['basic']): |
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121 _sethttperror(res, HTTP_BAD_REQUEST, |
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122 b'Only the basic LFS transfer handler is supported') |
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123 return True |
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124 |
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125 operation = lfsreq.get('operation') |
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126 if operation not in ('upload', 'download'): |
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127 _sethttperror(res, HTTP_BAD_REQUEST, |
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128 b'Unsupported LFS transfer operation: %s' % operation) |
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129 return True |
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130 |
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131 localstore = repo.svfs.lfslocalblobstore |
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132 |
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133 objects = [p for p in _batchresponseobjects(req, lfsreq.get('objects', []), |
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134 operation, localstore)] |
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135 |
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136 rsp = { |
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137 'transfer': 'basic', |
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138 'objects': objects, |
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139 } |
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140 |
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141 res.status = hgwebcommon.statusmessage(HTTP_OK) |
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142 res.headers[b'Content-Type'] = b'application/vnd.git-lfs+json' |
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143 res.setbodybytes(pycompat.bytestr(json.dumps(rsp))) |
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144 |
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145 return True |
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146 |
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147 def _batchresponseobjects(req, objects, action, store): |
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148 """Yield one dictionary of attributes for the Batch API response for each |
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149 object in the list. |
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150 |
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151 req: The parsedrequest for the Batch API request |
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152 objects: The list of objects in the Batch API object request list |
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153 action: 'upload' or 'download' |
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154 store: The local blob store for servicing requests""" |
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155 |
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156 # Successful lfs-test-server response to solict an upload: |
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157 # { |
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158 # u'objects': [{ |
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159 # u'size': 12, |
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160 # u'oid': u'31cf...8e5b', |
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161 # u'actions': { |
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162 # u'upload': { |
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163 # u'href': u'http://localhost:$HGPORT/objects/31cf...8e5b', |
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164 # u'expires_at': u'0001-01-01T00:00:00Z', |
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165 # u'header': { |
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166 # u'Accept': u'application/vnd.git-lfs' |
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167 # } |
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168 # } |
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169 # } |
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170 # }] |
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171 # } |
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172 |
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173 # TODO: Sort out the expires_at/expires_in/authenticated keys. |
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174 |
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175 for obj in objects: |
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176 # Convert unicode to ASCII to create a filesystem path |
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177 oid = obj.get('oid').encode('ascii') |
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178 rsp = { |
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179 'oid': oid, |
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180 'size': obj.get('size'), # XXX: should this check the local size? |
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181 #'authenticated': True, |
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182 } |
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183 |
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184 exists = True |
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185 verifies = False |
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186 |
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187 # Verify an existing file on the upload request, so that the client is |
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188 # solicited to re-upload if it corrupt locally. Download requests are |
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189 # also verified, so the error can be flagged in the Batch API response. |
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190 # (Maybe we can use this to short circuit the download for `hg verify`, |
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191 # IFF the client can assert that the remote end is an hg server.) |
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192 # Otherwise, it's potentially overkill on download, since it is also |
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193 # verified as the file is streamed to the caller. |
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194 try: |
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195 verifies = store.verify(oid) |
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196 except IOError as inst: |
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197 if inst.errno != errno.ENOENT: |
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198 _logexception(req) |
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199 |
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200 rsp['error'] = { |
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201 'code': 500, |
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202 'message': inst.strerror or 'Internal Server Server' |
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203 } |
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204 yield rsp |
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205 continue |
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206 |
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207 exists = False |
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208 |
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209 # Items are always listed for downloads. They are dropped for uploads |
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210 # IFF they already exist locally. |
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211 if action == 'download': |
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212 if not exists: |
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213 rsp['error'] = { |
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214 'code': 404, |
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215 'message': "The object does not exist" |
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216 } |
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217 yield rsp |
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218 continue |
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219 |
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220 elif not verifies: |
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221 rsp['error'] = { |
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222 'code': 422, # XXX: is this the right code? |
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223 'message': "The object is corrupt" |
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224 } |
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225 yield rsp |
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226 continue |
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227 |
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228 elif verifies: |
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229 yield rsp # Skip 'actions': already uploaded |
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230 continue |
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231 |
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232 expiresat = datetime.datetime.now() + datetime.timedelta(minutes=10) |
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233 |
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234 rsp['actions'] = { |
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235 '%s' % action: { |
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236 'href': '%s%s/.hg/lfs/objects/%s' |
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237 % (req.baseurl, req.apppath, oid), |
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238 # datetime.isoformat() doesn't include the 'Z' suffix |
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239 "expires_at": expiresat.strftime('%Y-%m-%dT%H:%M:%SZ'), |
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240 'header': { |
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241 # The spec doesn't mention the Accept header here, but avoid |
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242 # a gratuitous deviation from lfs-test-server in the test |
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243 # output. |
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244 'Accept': 'application/vnd.git-lfs' |
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245 } |
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246 } |
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247 } |
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248 |
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249 yield rsp |
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250 |
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251 def _processbasictransfer(repo, req, res, checkperm): |
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252 """Handle a single file upload (PUT) or download (GET) action for the Basic |
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253 Transfer Adapter. |
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254 |
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255 After determining if the request is for an upload or download, the access |
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256 must be checked by calling ``checkperm()`` with either 'pull' or 'upload' |
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257 before accessing the files. |
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258 |
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259 https://github.com/git-lfs/git-lfs/blob/master/docs/api/basic-transfers.md |
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260 """ |
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261 |
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262 method = req.method |
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263 oid = req.dispatchparts[-1] |
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264 localstore = repo.svfs.lfslocalblobstore |
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265 |
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266 if len(req.dispatchparts) != 4: |
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267 _sethttperror(res, HTTP_NOT_FOUND) |
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268 return True |
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269 |
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270 if method == b'PUT': |
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271 checkperm('upload') |
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272 |
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273 # TODO: verify Content-Type? |
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274 |
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275 existed = localstore.has(oid) |
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276 |
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277 # TODO: how to handle timeouts? The body proxy handles limiting to |
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278 # Content-Length, but what happens if a client sends less than it |
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279 # says it will? |
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280 |
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281 statusmessage = hgwebcommon.statusmessage |
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282 try: |
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283 localstore.download(oid, req.bodyfh) |
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284 res.status = statusmessage(HTTP_OK if existed else HTTP_CREATED) |
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285 except blobstore.LfsCorruptionError: |
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286 _logexception(req) |
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287 |
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288 # XXX: Is this the right code? |
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289 res.status = statusmessage(422, b'corrupt blob') |
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290 |
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291 # There's no payload here, but this is the header that lfs-test-server |
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292 # sends back. This eliminates some gratuitous test output conditionals. |
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293 res.headers[b'Content-Type'] = b'text/plain; charset=utf-8' |
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294 res.setbodybytes(b'') |
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295 |
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296 return True |
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297 elif method == b'GET': |
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298 checkperm('pull') |
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299 |
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300 res.status = hgwebcommon.statusmessage(HTTP_OK) |
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301 res.headers[b'Content-Type'] = b'application/octet-stream' |
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302 |
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303 try: |
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304 # TODO: figure out how to send back the file in chunks, instead of |
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305 # reading the whole thing. (Also figure out how to send back |
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306 # an error status if an IOError occurs after a partial write |
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307 # in that case. Here, everything is read before starting.) |
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308 res.setbodybytes(localstore.read(oid)) |
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309 except blobstore.LfsCorruptionError: |
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310 _logexception(req) |
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311 |
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312 # XXX: Is this the right code? |
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313 res.status = hgwebcommon.statusmessage(422, b'corrupt blob') |
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314 res.setbodybytes(b'') |
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315 |
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316 return True |
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317 else: |
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318 _sethttperror(res, HTTP_BAD_REQUEST, |
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319 message=b'Unsupported LFS transfer method: %s' % method) |
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320 return True |