Added prototpye of SONATA gatekeeper API. Can already accept uploaded packages and...

[osm/vim-emu.git] / src / emuvim / api / sonata / dummygatekeeper.py

diff --git a/src/emuvim/api/sonata/dummygatekeeper.py b/src/emuvim/api/sonata/dummygatekeeper.py
index e69de29..e89c007 100644 (file)
--- a/src/emuvim/api/sonata/dummygatekeeper.py
+++ b/src/emuvim/api/sonata/dummygatekeeper.py
@@ -0,0 +1,118 @@
+"""
+This module implements a simple REST API that behaves like SONATA's gatekeeper.
+
+It is only used to support the development of SONATA's SDK tools and to demonstrate
+the year 1 version of the emulator until the integration with WP4's orchestrator is done.
+"""
+
+import logging
+import os
+import uuid
+import hashlib
+from flask import Flask, request
+import flask_restful as fr
+
+logging.getLogger("werkzeug").setLevel(logging.WARNING)
+
+
+UPLOAD_FOLDER = "/tmp/son-dummy-gk/uploads/"
+CATALOG_FOLDER = "/tmp/son-dummy-gk/catalog/"
+
+
+class Gatekeeper(object):
+
+    def __init__(self):
+        self.packages = dict()
+        self.instantiations = dict()
+        logging.info("Create SONATA dummy gatekeeper.")
+
+    def unpack_service_package(self, service_uuid):
+        # TODO implement method
+        # 1. unzip *.son file and store contents in CATALOG_FOLDER/services/<service_uuid>/
+        pass
+
+    def start_service(self, service_uuid):
+        # TODO implement method
+        # 1. parse descriptors
+        # 2. do the corresponding dc.startCompute(name="foobar") calls
+        # 3. store references to the compute objects in self.instantiations
+        pass
+
+
+"""
+Resource definitions and API endpoints
+"""
+
+
+class Packages(fr.Resource):
+
+    def post(self):
+        """
+        We expect request with a *.son file and store it in UPLOAD_FOLDER
+        """
+        try:
+            # get file contents
+            file = request.files['file']
+            # generate a uuid to reference this package
+            service_uuid = str(uuid.uuid4())
+            hash = hashlib.sha1(str(file)).hexdigest()
+            # ensure that upload folder exists
+            ensure_dir(UPLOAD_FOLDER)
+            upload_path = os.path.join(UPLOAD_FOLDER, "%s.son" % service_uuid)
+            # store *.son file to disk
+            file.save(upload_path)
+            size = os.path.getsize(upload_path)
+            # store a reference to the uploaded package in our gatekeeper
+            GK.packages[service_uuid] = upload_path
+            # generate the JSON result
+            return {"service_uuid": service_uuid, "size": size, "sha1": hash, "error": None}
+        except Exception as ex:
+            logging.exception("Service package upload failed:")
+            return {"service_uuid": None, "size": 0, "sha1": None, "error": "upload failed"}
+
+    def get(self):
+        return {"service_uuid_list": list(GK.packages.iterkeys())}
+
+
+class Instantiations(fr.Resource):
+
+    def post(self):
+        # TODO implement method
+        pass
+
+    def get(self):
+        # TODO implement method
+        pass
+
+# create a single, global GK object
+GK = Gatekeeper()
+# setup Flask
+app = Flask(__name__)
+app.config['MAX_CONTENT_LENGTH'] = 512 * 1024 * 1024  # 512 MB max upload
+api = fr.Api(app)
+# define endpoints
+api.add_resource(Packages, '/api/packages/uploads')
+api.add_resource(Instantiations, '/api/instantiations')
+
+
+def start_rest_api(host, port):
+    # start the Flask server (not the best performance but ok for our use case)
+    app.run(host=host,
+            port=port,
+            debug=True,
+            use_reloader=False  # this is needed to run Flask in a non-main thread
+            )
+
+
+def ensure_dir(name):
+    if not os.path.exists(name):
+       os.makedirs(name)
+
+
+if __name__ == '__main__':
+    """
+    Lets allow to run the API in standalone mode.
+    """
+    logging.getLogger("werkzeug").setLevel(logging.INFO)
+    start_rest_api("0.0.0.0", 8000)
+