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#!/usr/bin/env python
'''
A module to construct corpora databases for the Hyperscan benchmarker
(hsbench).
After construction, simply add blocks with the add_chunk() method, then call
finish() when you're done.
'''
import os.path
try:
from sqlite3 import dbapi2 as sqlite
except:
from pysqlite2 import dbapi2 as sqlite
class CorpusBuilder:
SCHEMA = '''
CREATE TABLE chunk (
id integer primary key,
stream_id integer not null,
data blob
);
'''
def __init__(self, outfile):
if os.path.exists(outfile):
raise RuntimeError("Database '%s' already exists" % outfile)
self.outfile = outfile
self.db = sqlite.connect(self.outfile)
self.db.executescript(CorpusBuilder.SCHEMA)
self.current_chunk_id = 0;
def add_chunk(self, stream_id, data):
chunk_id = self.current_chunk_id;
c = self.db.cursor()
q = 'insert into chunk (id, stream_id, data) values (?, ?, ?)'
c.execute(q, (chunk_id, stream_id, sqlite.Binary(data)))
self.current_chunk_id += 1
return chunk_id
def finish(self):
self.db.commit()
c = self.db.cursor()
q = 'create index chunk_stream_id_idx on chunk(stream_id)'
c.execute(q)
c = self.db.cursor()
q = 'vacuum'
c.execute(q)
c = self.db.cursor()
q = 'analyze'
c.execute(q)
self.db.commit()
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