def _generate_line()

in functions/source/populate_NLB_TG_with_ALB/dns/zone.py [0:0]

• 88 lines of code
• 23 McCabe index (conditional complexity)

    def _generate_line(self):
        # range lhs [ttl] [class] type rhs [ comment ]
        """Process one line containing the GENERATE statement from a DNS
        master file."""
        if self.current_origin is None:
            raise UnknownOrigin

        token = self.tok.get()
        # Range (required)
        try:
            start, stop, step = dns.grange.from_text(token.value)
            token = self.tok.get()
            if not token.is_identifier():
                raise dns.exception.SyntaxError
        except:
            raise dns.exception.SyntaxError

        # lhs (required)
        try:
            lhs = token.value
            token = self.tok.get()
            if not token.is_identifier():
                raise dns.exception.SyntaxError
        except:
            raise dns.exception.SyntaxError

        # TTL
        try:
            ttl = dns.ttl.from_text(token.value)
            token = self.tok.get()
            if not token.is_identifier():
                raise dns.exception.SyntaxError
        except dns.ttl.BadTTL:
            ttl = self.ttl
        # Class
        try:
            rdclass = dns.rdataclass.from_text(token.value)
            token = self.tok.get()
            if not token.is_identifier():
                raise dns.exception.SyntaxError
        except dns.exception.SyntaxError:
            raise dns.exception.SyntaxError
        except Exception:
            rdclass = self.zone.rdclass
        if rdclass != self.zone.rdclass:
            raise dns.exception.SyntaxError("RR class is not zone's class")
        # Type
        try:
            rdtype = dns.rdatatype.from_text(token.value)
            token = self.tok.get()
            if not token.is_identifier():
                raise dns.exception.SyntaxError
        except Exception:
            raise dns.exception.SyntaxError("unknown rdatatype '%s'" %
                                            token.value)

        # lhs (required)
        try:
            rhs = token.value
        except:
            raise dns.exception.SyntaxError

        lmod, lsign, loffset, lwidth, lbase = self._parse_modify(lhs)
        rmod, rsign, roffset, rwidth, rbase = self._parse_modify(rhs)
        for i in range(start, stop + 1, step):
            # +1 because bind is inclusive and python is exclusive

            if lsign == u'+':
                lindex = i + int(loffset)
            elif lsign == u'-':
                lindex = i - int(loffset)

            if rsign == u'-':
                rindex = i - int(roffset)
            elif rsign == u'+':
                rindex = i + int(roffset)

            lzfindex = str(lindex).zfill(int(lwidth))
            rzfindex = str(rindex).zfill(int(rwidth))

            name = lhs.replace(u'$%s' % (lmod), lzfindex)
            rdata = rhs.replace(u'$%s' % (rmod), rzfindex)

            self.last_name = dns.name.from_text(name, self.current_origin)
            name = self.last_name
            if not name.is_subdomain(self.zone.origin):
                self._eat_line()
                return
            if self.relativize:
                name = name.relativize(self.zone.origin)

            n = self.zone.nodes.get(name)
            if n is None:
                n = self.zone.node_factory()
                self.zone.nodes[name] = n
            try:
                rd = dns.rdata.from_text(rdclass, rdtype, rdata,
                                         self.current_origin, False)
            except dns.exception.SyntaxError:
                # Catch and reraise.
                (ty, va) = sys.exc_info()[:2]
                raise va
            except:
                # All exceptions that occur in the processing of rdata
                # are treated as syntax errors.  This is not strictly
                # correct, but it is correct almost all of the time.
                # We convert them to syntax errors so that we can emit
                # helpful filename:line info.
                (ty, va) = sys.exc_info()[:2]
                raise dns.exception.SyntaxError("caught exception %s: %s" %
                                                (str(ty), str(va)))

            rd.choose_relativity(self.zone.origin, self.relativize)
            covers = rd.covers()
            rds = n.find_rdataset(rdclass, rdtype, covers, True)
            rds.add(rd, ttl)