# Copyright 2010-2011 Fog Creek Software

# Copyright 2010-2011 Unity Technologies

#

# This software may be used and distributed according to the terms of the

# GNU General Public License version 2 or any later version.

'''remote largefile store; the base class for wirestore'''

import urllib2

from mercurial import util

from mercurial.i18n import _

from mercurial.wireproto import remotebatch

import lfutil

import basestore

class remotestore(basestore.basestore):

    '''a largefile store accessed over a network'''

    def __init__(self, ui, repo, url):

        super(remotestore, self).__init__(ui, repo, url)

    def put(self, source, hash):

        if self.sendfile(source, hash):

            raise util.Abort(

                _('remotestore: could not put %s to remote store %s')

                % (source, self.url))

        self.ui.debug(

            _('remotestore: put %s to remote store %s') % (source, self.url))

    def exists(self, hashes):

        return self._verify(hashes)

    def sendfile(self, filename, hash):

        self.ui.debug('remotestore: sendfile(%s, %s)\n' % (filename, hash))

        fd = None

        try:

            try:

                fd = lfutil.httpsendfile(self.ui, filename)

            except IOError, e:

                raise util.Abort(

                    _('remotestore: could not open file %s: %s')

                    % (filename, str(e)))

            return self._put(hash, fd)

        finally:

            if fd:

                fd.close()

    def _getfile(self, tmpfile, filename, hash):

        # quit if the largefile isn't there

        stat = self._stat(hash)

        if stat == 1:

            raise util.Abort(_('remotestore: largefile %s is invalid') % hash)

        elif stat == 2:

            raise util.Abort(_('remotestore: largefile %s is missing') % hash)

        try:

            length, infile = self._get(hash)

        except urllib2.HTTPError, e:

            # 401s get converted to util.Aborts; everything else is fine being

            # turned into a StoreError

            raise basestore.StoreError(filename, hash, self.url, str(e))

        except urllib2.URLError, e:

            # This usually indicates a connection problem, so don't

            # keep trying with the other files... they will probably

            # all fail too.

            raise util.Abort('%s: %s' % (self.url, e.reason))

        except IOError, e:

            raise basestore.StoreError(filename, hash, self.url, str(e))

        # Mercurial does not close its SSH connections after writing a stream

        if length is not None:

            infile = lfutil.limitreader(infile, length)

        return lfutil.copyandhash(lfutil.blockstream(infile), tmpfile)

    def _verify(self, hashes):

        return self._stat(hashes)

    def _verifyfile(self, cctx, cset, contents, standin, verified):

        filename = lfutil.splitstandin(standin)

        if not filename:

            return False

        fctx = cctx[standin]

        key = (filename, fctx.filenode())

        if key in verified:

            return False

        verified.add(key)

        stat = self._stat(hash)

        if not stat:

            return False

        elif stat == 1:

            self.ui.warn(

                _('changeset %s: %s: contents differ\n')

                % (cset, filename))

            return True # failed

        elif stat == 2:

            self.ui.warn(

                _('changeset %s: %s missing\n')

                % (cset, filename))

            return True # failed

        else:

            raise RuntimeError('verify failed: unexpected response from '

                               'statlfile (%r)' % stat)

    def batch(self):

        '''Support for remote batching.'''

        return remotebatch(self)