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added gzip functionality #1

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added gzip functionality #1

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9 changes: 8 additions & 1 deletion s3fdw/s3fdw.py
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@
import boto
import csv
from cStringIO import StringIO
import gzip

class S3Fdw(ForeignDataWrapper):
"""A foreign data wrapper for accessing csv files.
Expand All @@ -23,6 +24,7 @@ class S3Fdw(ForeignDataWrapper):
Default: ","
- quotechar or quote : quote separator
- skip_header or header: if integer, number of lines to skip, if true then 1, else 0
- gzip the file is compressed with gzip
"""

def __init__(self, fdw_options, fdw_columns):
Expand All @@ -45,6 +47,7 @@ def __init__(self, fdw_options, fdw_columns):
fdw_options.get("quote", '"'))
self.skip_header = int(fdw_options.get('skip_header') or
1 if fdw_options.get('header') in ('T', 'TRUE', 't', 'true') else 0)
self.gzip = fdw_options.get('gzip')
self.columns = fdw_columns

def execute(self, quals, columns):
Expand All @@ -56,7 +59,11 @@ def execute(self, quals, columns):
key.get_contents_to_file(stream)
stream.seek(0)

reader = csv.reader(stream, delimiter=self.delimiter, quotechar=self.quotechar)
if self.gzip:
reader = csv.reader(gzip.GzipFile(fileobj=stream),
delimiter=self.delimiter, quotechar=self.quotechar)
else:
reader = csv.reader(stream, delimiter=self.delimiter, quotechar=self.quotechar)
count = 0
checked = False
for line in reader:
Expand Down