D-Net

#!/usr/bin/python

import json

from flask import Flask, jsonify, request

from flask.json import JSONEncoder

from DLIQueryResolver import QueryResolver

from DLI_ObjectResolver import DLIObject, DLIRelation

from logger import dlilogger

class MyJSONEncoder(JSONEncoder):

    def default(self, obj):

        if isinstance(obj, DLIObject):

            return obj.__dict__

        if isinstance(obj, DLIRelation):

            return obj.__dict__

        return super(MyJSONEncoder, self).default(obj)

app = Flask(__name__)

app.debug = False

app.json_encoder = MyJSONEncoder

host = "http://localhost:8983/solr/DLIF-index-cleaned"

base_dnet_url = "http://localhost:8080/dli"

# q = QueryResolver("http://localhost:8983/solr/DLIF-index-cleaned_shard1_replica1")

class InvalidUsage(Exception):

    status_code = 400

    def __init__(self, message, status_code=None, payload=None):

        Exception.__init__(self)

        self.message = message

        if status_code is not None:

            self.status_code = status_code

        self.payload = payload

    def to_dict(self):

        rv = dict(self.payload or ())

        rv['message'] = self.message

        return rv

# Routes

@app.route('/')

def root():

    return app.send_static_file('index.html')

@app.route('/<path:path>')

def static_proxy(path):

    # send_static_file will guess the correct MIME type

    return app.send_static_file(path)

@app.route('/api/item/<path:identifier>', methods=['post', 'get'])

def getItem(identifier):

    if identifier:

        q = QueryResolver(host, base_dnet_url)

        return jsonify(result=q.get_item(identifier))

    else:

        raise InvalidUsage('This view is gone', status_code=410)

@app.route('/api/stats/', methods=['post', 'get'])

def stats():

    q = QueryResolver(host, base_dnet_url)

    return jsonify(stats=q.get_stats())

@app.route('/api/ds_info/', methods=['post', 'get'])

def info():

    q = QueryResolver(host, base_dnet_url)

    if 'id' in request.form:

        id = request.form['id']

        name = request.form['name']

        result = q.get_ds_info(id, name)

        return jsonify(info=result)

    result = q.get_all_ds()

    return jsonify(info=result)

@app.route('/api/stats_detail/', methods=['post', 'get'])

def stats_detail():

    q = QueryResolver(host, base_dnet_url)

    return jsonify(stats=q.get_stats_detail())

@app.route('/api/post/', methods=['post', 'get'])

def query_post():

    action = None

    query = None

    only_result = False

    filter_query = None

    start = 0

    if 'action' in request.form:

        action = request.form['action']

    if 'query' in request.form:

        query = request.form['query']

    if 'only_result' in request.form:

        only_result = True

    if 'browse_field' in request.form:

        try:

            filter_query = json.loads(request.form['browse_field'])

        except:

            app.logger.error("Unable to parse browse_field, current value %s" % request.form['browse_field'])

    if 'start' in request.form:

        start = int(request.form['start'])

    if action == 'query' and query is not None:

        q = QueryResolver(host, base_dnet_url)

        try:

            result = q.query(q=query, browse_fields=["entitytype", "provenance", "publisher"], start=start, only_result=only_result,

                             filter_query=filter_query)

        except Exception as e:

            print e

        return jsonify(result=result)

    else:

        return jsonify(error={'error_code': 'an error occur during query on server'})

if __name__ == '__main__':

    app.logger.addHandler(dlilogger)

    app.run(debug=False, host='0.0.0.0', processes=5)