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Viewing changes to bzrlib/smart/branch.py

  • Committer: Martin Pool
  • Date: 2005-11-04 01:46:31 UTC
  • mto: (1185.33.49 bzr.dev)
  • mto: This revision was merged to the branch mainline in revision 1512.
  • Revision ID: mbp@sourcefrog.net-20051104014631-750e0ad4172c952c
Make biobench directly executable

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bzrlib/smart/branch.py
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# Copyright (C) 2006 Canonical Ltd
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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"""Server-side branch related request implmentations."""
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from bzrlib import errors
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from bzrlib.bzrdir import BzrDir
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from bzrlib.smart.request import (
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    FailedSmartServerResponse,
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    SmartServerRequest,
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    SuccessfulSmartServerResponse,
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    )
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class SmartServerBranchRequest(SmartServerRequest):
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    """Base class for handling common branch request logic."""
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    def do(self, path, *args):
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        """Execute a request for a branch at path.
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        If the branch is a branch reference, NotBranchError is raised.
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        """
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        transport = self._backing_transport.clone(path)
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        bzrdir = BzrDir.open_from_transport(transport)
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        if bzrdir.get_branch_reference() is not None:
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            raise errors.NotBranchError(transport.base)
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        branch = bzrdir.open_branch()
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        return self.do_with_branch(branch, *args)
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44
 
 
45
 
class SmartServerLockedBranchRequest(SmartServerBranchRequest):
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    """Base class for handling common branch request logic for requests that
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    need a write lock.
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    """
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    def do_with_branch(self, branch, branch_token, repo_token, *args):
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        """Execute a request for a branch.
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        A write lock will be acquired with the given tokens for the branch and
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        repository locks.  The lock will be released once the request is
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        processed.  The physical lock state won't be changed.
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        """
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        # XXX: write a test for LockContention
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        branch.repository.lock_write(token=repo_token)
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        try:
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            branch.lock_write(token=branch_token)
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            try:
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                return self.do_with_locked_branch(branch, *args)
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            finally:
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                branch.unlock()
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        finally:
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            branch.repository.unlock()
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class SmartServerBranchGetConfigFile(SmartServerBranchRequest):
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    def do_with_branch(self, branch):
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        """Return the content of branch.control_files.get('branch.conf').
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        The body is not utf8 decoded - its the literal bytestream from disk.
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        """
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        try:
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            content = branch.control_files.get('branch.conf').read()
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        except errors.NoSuchFile:
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            content = ''
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        return SuccessfulSmartServerResponse( ('ok', ), content)
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class SmartServerRequestRevisionHistory(SmartServerBranchRequest):
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    def do_with_branch(self, branch):
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        """Get the revision history for the branch.
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        The revision list is returned as the body content,
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        with each revision utf8 encoded and \x00 joined.
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        """
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        return SuccessfulSmartServerResponse(
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            ('ok', ), ('\x00'.join(branch.revision_history())))
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class SmartServerBranchRequestLastRevisionInfo(SmartServerBranchRequest):
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    def do_with_branch(self, branch):
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        """Return branch.last_revision_info().
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        The revno is encoded in decimal, the revision_id is encoded as utf8.
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        """
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        revno, last_revision = branch.last_revision_info()
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        return SuccessfulSmartServerResponse(('ok', str(revno), last_revision))
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class SmartServerBranchRequestSetLastRevision(SmartServerLockedBranchRequest):
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    def do_with_locked_branch(self, branch, new_last_revision_id):
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        if new_last_revision_id == 'null:':
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            branch.set_revision_history([])
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        else:
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            if not branch.repository.has_revision(new_last_revision_id):
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                return FailedSmartServerResponse(
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                    ('NoSuchRevision', new_last_revision_id))
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            branch.generate_revision_history(new_last_revision_id)
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        return SuccessfulSmartServerResponse(('ok',))
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118
 
 
119
 
class SmartServerBranchRequestLockWrite(SmartServerBranchRequest):
120
 
    
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    def do_with_branch(self, branch, branch_token='', repo_token=''):
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        if branch_token == '':
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            branch_token = None
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        if repo_token == '':
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            repo_token = None
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        try:
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            repo_token = branch.repository.lock_write(token=repo_token)
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            try:
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                branch_token = branch.lock_write(token=branch_token)
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            finally:
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                # this leaves the repository with 1 lock
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                branch.repository.unlock()
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        except errors.LockContention:
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            return FailedSmartServerResponse(('LockContention',))
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        except errors.TokenMismatch:
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            return FailedSmartServerResponse(('TokenMismatch',))
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        except errors.UnlockableTransport:
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            return FailedSmartServerResponse(('UnlockableTransport',))
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        except errors.LockFailed, e:
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            return FailedSmartServerResponse(('LockFailed', str(e.lock), str(e.why)))
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        if repo_token is None:
142
 
            repo_token = ''
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        else:
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            branch.repository.leave_lock_in_place()
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        branch.leave_lock_in_place()
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        branch.unlock()
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        return SuccessfulSmartServerResponse(('ok', branch_token, repo_token))
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149
 
 
150
 
class SmartServerBranchRequestUnlock(SmartServerBranchRequest):
151
 
 
152
 
    def do_with_branch(self, branch, branch_token, repo_token):
153
 
        try:
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            branch.repository.lock_write(token=repo_token)
155
 
            try:
156
 
                branch.lock_write(token=branch_token)
157
 
            finally:
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                branch.repository.unlock()
159
 
        except errors.TokenMismatch:
160
 
            return FailedSmartServerResponse(('TokenMismatch',))
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        if repo_token:
162
 
            branch.repository.dont_leave_lock_in_place()
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        branch.dont_leave_lock_in_place()
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        branch.unlock()
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        return SuccessfulSmartServerResponse(('ok',))
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