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"""
These decorator functions wrap APIs for the simple search server.
"""
import os
from time import time
from datetime import datetime
import numpy as np
from PIL import Image
from flask import request, jsonify
from werkzeug.utils import secure_filename
from app.sql.common import Session
DEFAULT_LIMIT = 30
def api_query(f):
"""Wrap basic API queries with timing"""
def wrap_api_query(*args, **kwargs):
start = time()
query = {}
kwargs['query'] = query
results = f(*args, **kwargs)
query['timing'] = round(time() - start, 2)
if 'crop' in kwargs['query'] and kwargs['query']['crop'] is None:
del kwargs['query']['crop']
else:
crop = kwargs['query']['crop']
kwargs['query']['crop'] = {
'x': crop[0],
'y': crop[1],
'w': crop[2],
'h': crop[3],
}
if isinstance(results, list):
return { 'query': query, 'res': results }
else:
return { 'query': query, 'res': results }
wrap_api_query.__name__ = f.__name__
return wrap_api_query
def db_session(f):
"""Wrap API queries in a database session object which gets committed"""
def wrap_db_session(*args, **kwargs):
session = Session()
try:
kwargs['session'] = session
f(*args, **kwargs)
session.commit()
except:
session.rollback()
raise
finally:
session.close()
wrap_db_session.__name__ = f.__name__
return wrap_db_session
def get_offset_and_limit(f):
"""Normalize offset/limit query string params"""
def wrap_offset(*args, **kwargs):
kwargs['query']['offset'] = request.args.get('offset', default=0, type=int)
kwargs['query']['limit'] = request.args.get('limit', default=DEFAULT_LIMIT, type=int)
x = float(request.args.get('x', default=0.0, type=float))
y = float(request.args.get('y', default=0.0, type=float))
w = float(request.args.get('w', default=0.0, type=float))
h = float(request.args.get('h', default=0.0, type=float))
if w != 0.0 and h != 0.0:
kwargs['query']['crop'] = (x, y, w, h,)
else:
kwargs['query']['crop'] = None
return f(*args, **kwargs)
wrap_offset.__name__ = f.__name__
return wrap_offset
def store_uploaded_image(param_name, store=False, uploaded_im_path='static/data/uploaded'):
"""Retrive an uploaded image and prepare for processing. Optionally store it to disk."""
def decorator(f):
def wrap_uploaded_image(*args, **kwargs):
if param_name not in request.files:
raise APIError('No file uploaded')
file = request.files[param_name]
# convert string of image data to uint8
nparr = np.fromstring(file.read(), np.uint8)
# decode image
im = Image.fromarray(nparr)
kwargs['im'] = im
if store:
uploaded_im_fn = secure_filename(datetime.now().isoformat() + "_" + file.filename)
uploaded_im_abspath = os.path.join(uploaded_im_path, uploaded_im_fn)
uploaded_im_remote_path = os.path.join('/', uploaded_im_path, uploaded_im_fn)
nparr.tofile(uploaded_im_abspath)
kwargs['query']['url'] = uploaded_im_remote_path
return f(*args, **kwargs)
wrap_uploaded_image.__name__ = f.__name__
return wrap_uploaded_image
return decorator
def as_json(f):
"""Output an API query as JSON"""
def wrap_jsonify(*args, **kwargs):
return jsonify(f(*args, **kwargs))
wrap_jsonify.__name__ = f.__name__
return wrap_jsonify
def exception_handler(f):
"""Handle exceptions caused by the API"""
def wrapper(*args, **kwargs):
try:
return f(*args, **kwargs)
except Exception as e:
return {
"error": True,
"message": e.message,
"query": kwargs['query'],
}
wrapper.__name__ = f.__name__
return wrapper
class APIError(Exception):
def __init__(self, message):
self.message = message
def __str__(self):
return repr(self.message)
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