Method _build_url

pydantic/v1/networks.py:439–484

(cls, m: Match[str], url: str, parts: 'Parts')

    @classmethod
    def _build_url(cls, m: Match[str], url: str, parts: 'Parts') -> 'MultiHostDsn':
        hosts_parts: List['HostParts'] = []
        host_re = host_regex()
        for host in m.groupdict()['hosts'].split(','):
            d: Parts = host_re.match(host).groupdict()  # type: ignore
            host, tld, host_type, rebuild = cls.validate_host(d)
            port = d.get('port')
            cls._validate_port(port)
            hosts_parts.append(
                {
                    'host': host,
                    'host_type': host_type,
                    'tld': tld,
                    'rebuild': rebuild,
                    'port': port,
                }
            )

        if len(hosts_parts) > 1:
            return cls(
                None if any([hp['rebuild'] for hp in hosts_parts]) else url,
                scheme=parts['scheme'],
                user=parts['user'],
                password=parts['password'],
                path=parts['path'],
                query=parts['query'],
                fragment=parts['fragment'],
                host_type=None,
                hosts=hosts_parts,
            )
        else:
            # backwards compatibility with single host
            host_part = hosts_parts[0]
            return cls(
                None if host_part['rebuild'] else url,
                scheme=parts['scheme'],
                user=parts['user'],
                password=parts['password'],
                host=host_part['host'],
                tld=host_part['tld'],
                host_type=host_part['host_type'],
                port=host_part.get('port'),
                path=parts['path'],
                query=parts['query'],
                fragment=parts['fragment'],
            )


class PostgresDsn(MultiHostDsn):