src/emuvim/api/sonata/dummygatekeeper.py

   1 """
   2 This module implements a simple REST API that behaves like SONATA's gatekeeper.
   3
   4 It is only used to support the development of SONATA's SDK tools and to demonstrate
   5 the year 1 version of the emulator until the integration with WP4's orchestrator is done.
   6 """
   7
   8 import logging
   9 import os
  10 import uuid
  11 import hashlib
  12 from flask import Flask, request
  13 import flask_restful as fr
  14
  15 logging.getLogger("werkzeug").setLevel(logging.WARNING)
  16
  17
  18 UPLOAD_FOLDER = "/tmp/son-dummy-gk/uploads/"
  19 CATALOG_FOLDER = "/tmp/son-dummy-gk/catalog/"
  20
  21
  22 class Gatekeeper(object):
  23
  24     def __init__(self):
  25         self.packages = dict()
  26         self.instantiations = dict()
  27         logging.info("Create SONATA dummy gatekeeper.")
  28
  29     def unpack_service_package(self, service_uuid):
  30         # TODO implement method
  31         # 1. unzip *.son file and store contents in CATALOG_FOLDER/services/<service_uuid>/
  32         pass
  33
  34     def start_service(self, service_uuid):
  35         # TODO implement method
  36         # 1. parse descriptors
  37         # 2. do the corresponding dc.startCompute(name="foobar") calls
  38         # 3. store references to the compute objects in self.instantiations
  39         pass
  40
  41
  42 """
  43 Resource definitions and API endpoints
  44 """
  45
  46
  47 class Packages(fr.Resource):
  48
  49     def post(self):
  50         """
  51         We expect request with a *.son file and store it in UPLOAD_FOLDER
  52         """
  53         try:
  54             # get file contents
  55             file = request.files['file']
  56             # generate a uuid to reference this package
  57             service_uuid = str(uuid.uuid4())
  58             hash = hashlib.sha1(str(file)).hexdigest()
  59             # ensure that upload folder exists
  60             ensure_dir(UPLOAD_FOLDER)
  61             upload_path = os.path.join(UPLOAD_FOLDER, "%s.son" % service_uuid)
  62             # store *.son file to disk
  63             file.save(upload_path)
  64             size = os.path.getsize(upload_path)
  65             # store a reference to the uploaded package in our gatekeeper
  66             GK.packages[service_uuid] = upload_path
  67             # generate the JSON result
  68             return {"service_uuid": service_uuid, "size": size, "sha1": hash, "error": None}
  69         except Exception as ex:
  70             logging.exception("Service package upload failed:")
  71             return {"service_uuid": None, "size": 0, "sha1": None, "error": "upload failed"}
  72
  73     def get(self):
  74         return {"service_uuid_list": list(GK.packages.iterkeys())}
  75
  76
  77 class Instantiations(fr.Resource):
  78
  79     def post(self):
  80         # TODO implement method
  81         pass
  82
  83     def get(self):
  84         # TODO implement method
  85         pass
  86
  87 # create a single, global GK object
  88 GK = Gatekeeper()
  89 # setup Flask
  90 app = Flask(__name__)
  91 app.config['MAX_CONTENT_LENGTH'] = 512 * 1024 * 1024  # 512 MB max upload
  92 api = fr.Api(app)
  93 # define endpoints
  94 api.add_resource(Packages, '/api/packages/uploads')
  95 api.add_resource(Instantiations, '/api/instantiations')
  96
  97
  98 def start_rest_api(host, port):
  99     # start the Flask server (not the best performance but ok for our use case)
 100     app.run(host=host,
 101             port=port,
 102             debug=True,
 103             use_reloader=False  # this is needed to run Flask in a non-main thread
 104             )
 105
 106
 107 def ensure_dir(name):
 108     if not os.path.exists(name):
 109        os.makedirs(name)
 110
 111
 112 if __name__ == '__main__':
 113     """
 114     Lets allow to run the API in standalone mode.
 115     """
 116     logging.getLogger("werkzeug").setLevel(logging.INFO)
 117     start_rest_api("0.0.0.0", 8000)
 118