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target_csv.py
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target_csv.py
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#!/usr/bin/env python3
import argparse
import io
import os
import sys
import json
import csv
import threading
import http.client
import urllib
from datetime import datetime
import collections
import pkg_resources
from jsonschema.validators import Draft4Validator
import singer
logger = singer.get_logger()
def emit_state(state):
if state is not None:
line = json.dumps(state)
logger.debug('Emitting state {}'.format(line))
sys.stdout.write("{}\n".format(line))
sys.stdout.flush()
def flatten(d, parent_key='', sep='__'):
items = []
for k, v in d.items():
new_key = parent_key + sep + k if parent_key else k
if isinstance(v, collections.MutableMapping):
items.extend(flatten(v, new_key, sep=sep).items())
else:
items.append((new_key, str(v) if type(v) is list else v))
return dict(items)
def persist_messages(delimiter, quotechar, messages, destination_path):
state = None
schemas = {}
key_properties = {}
headers = {}
validators = {}
now = datetime.now().strftime('%Y%m%dT%H%M%S')
for message in messages:
try:
o = singer.parse_message(message).asdict()
except json.decoder.JSONDecodeError:
logger.error("Unable to parse:\n{}".format(message))
raise
message_type = o['type']
if message_type == 'RECORD':
if o['stream'] not in schemas:
raise Exception("A record for stream {}"
"was encountered before a corresponding schema".format(o['stream']))
validators[o['stream']].validate(o['record'])
filename = o['stream'] + '-' + now + '.csv'
filename = os.path.expanduser(os.path.join(destination_path, filename))
file_is_empty = (not os.path.isfile(filename)) or os.stat(filename).st_size == 0
flattened_record = flatten(o['record'])
if o['stream'] not in headers and not file_is_empty:
with open(filename, 'r') as csvfile:
reader = csv.reader(csvfile,
delimiter=delimiter,
quotechar=quotechar)
first_line = next(reader)
headers[o['stream']] = first_line if first_line else flattened_record.keys()
else:
headers[o['stream']] = flattened_record.keys()
with open(filename, 'a') as csvfile:
writer = csv.DictWriter(csvfile,
headers[o['stream']],
extrasaction='ignore',
delimiter=delimiter,
quotechar=quotechar)
if file_is_empty:
writer.writeheader()
writer.writerow(flattened_record)
state = None
elif message_type == 'STATE':
logger.debug('Setting state to {}'.format(o['value']))
state = o['value']
elif message_type == 'SCHEMA':
stream = o['stream']
schemas[stream] = o['schema']
validators[stream] = Draft4Validator(o['schema'])
key_properties[stream] = o['key_properties']
else:
logger.warning("Unknown message type {} in message {}"
.format(o['type'], o))
return state
def send_usage_stats():
try:
version = pkg_resources.get_distribution('target-csv').version
conn = http.client.HTTPConnection('collector.singer.io', timeout=10)
conn.connect()
params = {
'e': 'se',
'aid': 'singer',
'se_ca': 'target-csv',
'se_ac': 'open',
'se_la': version,
}
conn.request('GET', '/i?' + urllib.parse.urlencode(params))
response = conn.getresponse()
conn.close()
except:
logger.debug('Collection request failed')
def main():
parser = argparse.ArgumentParser()
parser.add_argument('-c', '--config', help='Config file')
args = parser.parse_args()
if args.config:
with open(args.config) as input_json:
config = json.load(input_json)
else:
config = {}
if not config.get('disable_collection', False):
logger.info('Sending version information to singer.io. ' +
'To disable sending anonymous usage data, set ' +
'the config parameter "disable_collection" to true')
threading.Thread(target=send_usage_stats).start()
input_messages = io.TextIOWrapper(sys.stdin.buffer, encoding='utf-8')
state = persist_messages(config.get('delimiter', ','),
config.get('quotechar', '"'),
input_messages,
config.get('destination_path', ''))
emit_state(state)
logger.debug("Exiting normally")
if __name__ == '__main__':
main()