示例#1
0
    def _cacheOpen(self, filename):
        """Open shelve database in filename and check version

        Returns tuple (writeflag, shelve-object) on success or None on failure.
        """
        # first try opening the cache read-write
        try:
            fh = dirshelve.open(filename)
            writeflag = 1
        except dirshelve.error:
            # initial open failed -- try opening the cache read-only
            try:
                fh = dirshelve.open(filename,"r")
                writeflag = 0
            except dirshelve.error:
                self.warning("Unable to open CL script cache file %s" %
                        (filename,))
                return None
        # check version of cache -- don't use it if out-of-date
        if fh.has_key(_versionKey):
            oldVersion = fh[_versionKey]
        elif len(fh) == 0:
            fh[_versionKey] = _currentVersion
            oldVersion = _currentVersion
        else:
            oldVersion = 'v0'
        if oldVersion == _currentVersion:
            return (writeflag, fh)
        # open succeeded, but version looks out-of-date
        fh.close()
        rv = None
        msg = ["CL script cache file is obsolete version (old %s, current %s)" %
                (`oldVersion`, `_currentVersion`)]
        if not writeflag:
            # we can't replace it if we couldn't open it read-write
            msg.append("Ignoring obsolete cache file %s" % filename)
        else:
            # try renaming the old file and creating a new one
            rfilename = filename + "." + oldVersion
            try:
                os.rename(filename, rfilename)
                msg.append("Renamed old cache to %s" % rfilename)
                try:
                    # create new cache file
                    fh = dirshelve.open(filename)
                    fh[_versionKey] = _currentVersion
                    msg.append("Created new cache file %s" % filename)
                    rv = (writeflag, fh)
                except dirshelve.error:
                    msg.append("Could not create new cache file %s" % filename)
            except OSError:
                msg.append("Could not rename old cache file %s" % filename)
        self.warning(string.join(msg,"\n"))
        return rv
示例#2
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    def _cacheOpen(self, filename):
        """Open shelve database in filename and check version

        Returns tuple (writeflag, shelve-object, filename) on success or
        None on failure.
        This may modify the filename if necessary to open the correct version of
        the cache.
        """
        # filenames to try, open flags to use
        filelist = [(filename, "w"),
                    ('%s.%s' % (filename, _currentVersion()), "c")]
        msg = []
        for fname, flag in filelist:
            # first try opening the cache read-write
            try:
                fh = dirshelve.open(fname, flag)
                writeflag = 1
            except dirshelve.error:
                # initial open failed -- try opening the cache read-only
                try:
                    fh = dirshelve.open(fname, "r")
                    writeflag = 0
                except dirshelve.error:
                    # give up on this file and try the next one
                    msg.append("Unable to open CL script cache %s" % fname)
                    continue
            # check version of cache -- don't use it if version mismatch
            if len(fh) == 0:
                fh[_versionKey] = _currentVersion()
            oldVersion = fh.get(_versionKey, 'v0')
            if oldVersion == _currentVersion():
                # normal case -- cache version is as expected
                return (writeflag, fh, fname)
            elif fname.endswith(_currentVersion()):
                # uh-oh, something is seriously wrong
                msg.append(
                    "CL script cache %s has version mismatch, may be corrupt?"
                    % fname)
            elif oldVersion > _currentVersion():
                msg.append(
                    ("CL script cache %s was created by " +
                     "a newer version of pyraf (cache %s, this pyraf %s)") %
                    (fname, ` oldVersion `, ` _currentVersion() `))
            else:
                msg.append(
                    "CL script cache %s is obsolete version (old %s, current %s)"
                    % (fname, ` oldVersion `, ` _currentVersion() `))
            fh.close()
        # failed to open either cache
        self.warning("\n".join(msg))
        return None
示例#3
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    def _cacheOpen(self, filename):
        """Open shelve database in filename and check version

        Returns tuple (writeflag, shelve-object, filename) on success or
        None on failure.
        This may modify the filename if necessary to open the correct version of
        the cache.
        """
        # filenames to try, open flags to use
        filelist = [(filename, "w"),
                    ('%s.%s' % (filename, _currentVersion()), "c")]
        msg = []
        for fname, flag in filelist:
            # first try opening the cache read-write
            try:
                fh = dirshelve.open(fname, flag)
                writeflag = 1
            except dirshelve.error:
                # initial open failed -- try opening the cache read-only
                try:
                    fh = dirshelve.open(fname,"r")
                    writeflag = 0
                except dirshelve.error:
                    # give up on this file and try the next one
                    msg.append("Unable to open CL script cache %s" % fname)
                    continue
            # check version of cache -- don't use it if version mismatch
            if len(fh) == 0:
                fh[_versionKey] = _currentVersion()
            oldVersion = fh.get(_versionKey, 'v0')
            if oldVersion == _currentVersion():
                # normal case -- cache version is as expected
                return (writeflag, fh, fname)
            elif fname.endswith(_currentVersion()):
                # uh-oh, something is seriously wrong
                msg.append("CL script cache %s has version mismatch, may be corrupt?" %
                    fname)
            elif oldVersion > _currentVersion():
                msg.append(("CL script cache %s was created by " +
                    "a newer version of pyraf (cache %s, this pyraf %s)") %
                    (fname, `oldVersion`, `_currentVersion()`))
            else:
                msg.append("CL script cache %s is obsolete version (old %s, current %s)" %
                        (fname, `oldVersion`, `_currentVersion()`))
            fh.close()
        # failed to open either cache
        self.warning("\n".join(msg))
        return None
示例#4
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 def setUp(self):
     self.shelf = dirshelve.open(TEST_DIR)
示例#5
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 def setUp(self):
     self.shelf = dirshelve.open(TEST_DIR, writeback=True)