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SQLite Directory deployed on each commit #14

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87 changes: 87 additions & 0 deletions directory.py
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import collections
import glob
import sqlite3

import yaml


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, v))
return dict(items)


def generate_schema(table_name, column_names):
columns = ', '.join(['"{}" TEXT'.format(column_name) for column_name in column_names])
return f'CREATE TABLE IF NOT EXISTS "{table_name}" ({columns})'


def insert_metadata(connection, table_name, metadata):
question_marks = ", ".join(["?" for i in range(len(metadata))])
column_names = ', '.join('"%s"' % _ for _ in metadata.keys())
values = tuple(metadata.values())
connection.execute(
f'INSERT INTO {table_name} ({column_names}) VALUES ({question_marks})',
values)


def generate_database(filename, sections, skipped_keys):
"""Generate sqlite database from yaml metadata files

Args
====
filename: str
sqlite database filename
sections: set
set of directories to parse for *.yml files and flatten into sqlite tables
skipped_keys: set
dictionary of keys in metadata files to skip (mainly a hack to handle tags and groups
"""
connection = sqlite3.connect(filename)

with connection:
for section in sections:
keys = set()
for filename in glob.glob(f'{section}/*.yml'):
with open(filename) as f:
metadata = yaml.safe_load(f)
keys = keys | flatten(metadata).keys()

section_schema = generate_schema(section, keys)
connection.execute(section_schema)

for filename in glob.glob(f'{section}/*.yml'):
with open(filename) as f:
metadata = yaml.safe_load(f)
for key in skipped_keys.get(section, set()):
if key in metadata:
del metadata[key]
try:
insert_metadata(connection, section, flatten(metadata))
except:
print('failed to insert', filename)


def main():
sections = {
'bloggers', 'conferences', 'coworking_spaces',
'event_spaces', 'groups', 'organizations', 'organizers'
}

# for now we skip lists this will require a many to many
# relationship table
skipped_keys = {
'groups': {'tags'},
'organizers': {'group'},
}

generate_database('db.sqlite', sections, skipped_keys)


if __name__ == "__main__":
main()