IMServer:Server
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Python code <source lang="python"> """
Decodes the path info and fetches the corresponding tile from pymongo
""" import pymongo import sys
- add module path
sys.path.append('/var/www-dj/')
- import module with singleton instance
from mongo import m
def application(environ, start_response):
""" The WSGI application to retrieve images from database """ def error(error_msg): status = "200 OK" response_headers = [('Content-type', 'text/plain'), ('Content-Length', str(len(error_msg)))] start_response(status, response_headers) return [error_msg]
# emit status / headers db = m.conn['clay1']
try: str2 = environ['PATH_INFO'] except: # Give some default request if # no parameters passed in URL str2 = '/tiles3.py/n1/t.jpg'
path = str2.split('/') if len(path) != 3: #incorrect syntax return error(str(path))
col = db[path[1]] res = col.find_one({"name" : path[2]}) m.conn.end_request() if res == None: return error('Item not found in database ..')
# Create the response headers status = "200 OK" response_headers = [('Content-type', 'image/jpeg'), ('Content-Length', str(len(res['file'])))] start_response(status, response_headers) return [str(res['file'])]
</source>
Mongo module manages connection pool internally. Another simple script is used to recreate indexes after data has been added.