def schemaless_reader(fo, schema):
"""Reads a single record writen using the schemaless_writer
Paramaters
----------
fo: file like
Input stream
schema: dict
Reader schema
"""
acquaint_schema(schema, READERS)
return read_data(fo, schema)
def __init__(self, fo, reader_schema=None):
"""Creates a new iterator
Paramaters
----------
fo: file like
Input stream
reader_schema: dict, optional
Reader schema
Example
-------
>>> with open('some-file.avro', 'rb') as fo:
>>> avro = iter_avro(fo)
>>> schema = avro.schema
>>> for record in avro:
>>> process_record(record)
"""
self.fo = fo
try:
self._header = read_data(fo, HEADER_SCHEMA)
except StopIteration:
raise ValueError('cannot read header - is it an avro file?')
# `meta` values are bytes. So, the actual decoding has to be external.
self.metadata = \
dict((k, btou(v)) for k, v in iteritems(self._header['meta']))
self.schema = self.writer_schema = \
json.loads(self.metadata['avro.schema'])
self.codec = self.metadata.get('avro.codec', 'null')
self.reader_schema = reader_schema
acquaint_schema(self.writer_schema, READERS)
if reader_schema:
populate_schema_defs(reader_schema)
self._records = _iter_avro(fo,
self._header,
self.codec,
self.writer_schema,
reader_schema)
