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# -*- coding: utf-8 -*-
"""
Dataset handling
The dataset model is defined in the adjacent 'dataset_schema.json' file, which
is a JSONSchema schema definition. It can be easily edited at
www.jsonschema.net or yapi.demo.qunar.com/editor/
Missing values must be denoted by 'NaN' (this is understood by the JSON
decoder).
Author: Gertjan van den Burg
"""
import hashlib
import json
import jsonschema
import logging
import os
from flask import current_app
LOGGER = logging.getLogger(__file__)
def load_schema():
pth = os.path.abspath(__file__)
basedir = os.path.dirname(pth)
schema_file = os.path.join(basedir, "dataset_schema.json")
if not os.path.exists(schema_file):
raise FileNotFoundError(schema_file)
with open(schema_file, "rb") as fp:
schema = json.load(fp)
return schema
def validate_dataset(filename):
if not os.path.exists(filename):
return "File not found."
with open(filename, "rb") as fp:
try:
data = json.load(fp)
except json.JSONDecodeError as err:
return "JSON decoding error: %s" % err.msg
try:
schema = load_schema()
except FileNotFoundError:
return "Schema file not found."
try:
jsonschema.validate(instance=data, schema=schema)
except jsonschema.ValidationError as err:
return "JSONSchema validation error: %s" % err.message
if len(data["series"]) != data["n_dim"]:
return "Number of dimensions and number of series don't match"
if "time" in data.keys():
if len(data["time"]["raw"]) != data["n_obs"]:
return "Number of time points doesn't match number of observations"
for var in data["series"]:
if len(var["raw"]) != data["n_obs"]:
return "Number of observations doesn't match for %s" % var["label"]
return None
def get_name_from_dataset(filename):
with open(filename, "rb") as fid:
data = json.load(fid)
return data["name"]
def dataset_is_demo(filename):
with open(filename, "rb") as fid:
data = json.load(fid)
return "demo" in data.keys()
def get_demo_true_cps(name):
dataset_dir = os.path.join(
current_app.instance_path, current_app.config["DATASET_DIR"]
)
target_filename = os.path.join(dataset_dir, name + ".json")
if not os.path.exists(target_filename):
LOGGER.error("Dataset with name '%s' can't be found!" % name)
return None
with open(target_filename, "rb") as fid:
data = json.load(fid)
if not "demo" in data:
LOGGER.error("Asked for 'demo' key in non-demo dataset '%s'" % name)
return None
if not "true_CPs" in data["demo"]:
LOGGER.error(
"Expected field'true_cps' field missing for dataset '%s'" % name
)
return data["demo"]["true_CPs"]
def md5sum(filename):
""" Compute the MD5 hash for a given filename """
blocksize = 65536
hasher = hashlib.md5()
with open(filename, "rb") as fid:
buf = fid.read(blocksize)
while len(buf) > 0:
hasher.update(buf)
buf = fid.read(blocksize)
return hasher.hexdigest()
def load_data_for_chart(name, known_md5):
dataset_dir = os.path.join(
current_app.instance_path, current_app.config["DATASET_DIR"]
)
target_filename = os.path.join(dataset_dir, name + ".json")
if not os.path.exists(target_filename):
LOGGER.error("Dataset with name '%s' can't be found!" % name)
return None
if not md5sum(target_filename) == known_md5:
LOGGER.error(
"""
MD5 checksum failed for dataset with name: %s.
Found: %s.
Expected: %s.
"""
% (name, md5sum(target_filename), known_md5)
)
return None
with open(target_filename, "rb") as fid:
data = json.load(fid)
chart_data = {"time": data["time"] if "time" in data else None, "values":
data["series"]}
return {"chart_data": chart_data}
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