def files_log_graph(self, stream):
        ''' Build up a graph (nodes and edges from a Bro files.log) '''
        file_log = list(stream)
        print 'Entering file_log_graph...(%d rows)' % len(file_log)
        for row in file_log:

            # If the mime-type is interesting add the uri and the host->uri->host relationships
            if row['mime_type'] not in self.exclude_mime_types:

                # Check for weird conditions
                if (row['total_bytes'] == '-'):
                    continue
                if ('-' in row['md5']):
                    continue

                # Check for missing bytes
                if row['missing_bytes']:
                    labels = ['file','missing']
                else:
                    labels = ['file']

                # Make the file node name kewl
                name = '%6s  %s  %.0f-KB' % (row['md5'][:6], row['mime_type'], row['total_bytes']/1024.0)
                if row['missing_bytes']:
                    name += '*'
                name = name.replace('application/','')

                # Add the file node
                self.add_node(row['md5'], name, labels)

                # Add the tx_host
                self.add_node(row['tx_hosts'], row['tx_hosts'], ['host'])

                # Add the file->tx_host relationship
                self.add_rel(row['tx_hosts'], row['md5'], 'file')
Build up a graph (nodes and edges from a Bro files.log)