Added Trace Retrieval microservice

.gitignore

+**/__pycache__

trace-retrieval-microservice/Dockerfile

+FROM python:3
+LABEL maintainer="Alexander Lercher"
+
+ENV http_proxy http://proxy.uni-klu.ac.at:3128/
+ENV https_proxy http://proxy.uni-klu.ac.at:3128/
+
+RUN apt-get update
+RUN pip install flask
+RUN pip install connexion[swagger-ui]
+
+EXPOSE 5000
+
+WORKDIR /app
+COPY app/ /app/
+RUN chmod a+x main.py
+
+CMD ["python", "./main.py"]
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trace-retrieval-microservice/README.md

+# Trace Retrieval Microservice
+The trace retrieval microservice is used as an interface to the blockchain component (TIC). It receives and preprocesses all available traces.
+
+## Technologies
+- Python 3.x
+- Python module Flask
+- Python module Connexion with Swagger
+- Docker
+- Kubernetes
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trace-retrieval-microservice/app/blockchain_trace.py

+from flask import request, Response
+
+def receive():
+    # print(request.json)
+    return Response(status=201)

trace-retrieval-microservice/app/configs/swagger.yml

+swagger: "2.0"
+info:
+  title: Trace Retrieval microservice
+  description: This is the documentation for the trace retrieval microservice.
+  version: "1.0.0"
+
+consumes:
+  - "application/json"
+produces:
+  - "application/json"
+
+basePath: "/api"
+
+# Paths supported by the server application
+paths:
+  /debug:
+    post:
+      operationId: "debug.echo"
+      tags:
+        - "Echo"
+      summary: "Echo function for debugging purposes"
+      description: "Echoes the input back to the caller."
+      parameters:
+        - in: body
+          name: "Object"
+          required: true
+          schema:
+            type: object
+      responses:
+        200:
+          description: "Successful echo of request data"
+
+  /trace:
+    post:
+        operationId: "blockchain_trace.receive"
+        tags:
+          - "Blockchain Trace"
+        summary: "Add a new blockchain trace to SMART"
+        description: "Receives a new blockchain trace to store in SMART."
+        parameters:
+          - in: body 
+            name: "BlockchainTrace"
+            description: "The trace to be added"
+            required: true
+            schema:
+              $ref: "#/definitions/BlockchainTrace"
+        responses:
+          201:
+            description: "Successful operation"
+          400:
+            description: "Invalid input"
+              
+definitions:
+  BlockchainTrace:
+    type: "object"
+    properties:
+      TransactionId:
+        type: string
+        format: uuid
+      Timestamp:
+        type: "string"
+        format: "date-time"
+      ApplicationType:
+        type: "string"
+      TransactionFrom:
+        type: "string"
+        format: "uuid"
+      TransactionTo:
+        type: "string"
+        format: "uuid"
+      TransferredAsset:
+        type: "string"
+      ResourceIds:
+        type: "string"
+      ResourceMd5:
+        type: "string"
+      ResourceState:
+        type: "string"
+      Metadata:
+        type: "string"
+    
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trace-retrieval-microservice/app/debug.py

+from flask import request
+
+def echo():
+    return request.json
+
+ 
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trace-retrieval-microservice/app/main.py

+import connexion
+
+# load swagger config 
+app = connexion.App(__name__, specification_dir='configs/')
+app.add_api('swagger.yml')
+
+@app.route('/', methods=['GET'])
+def api_root():
+    return 'Endpoint of trace-retrieval-microservice!'
+
+# start app
+if __name__ == '__main__':
+    app.run(host='0.0.0.0', port=5000, debug=True)

trace-retrieval-microservice/deployment/deployment.yml

+apiVersion: apps/v1
+kind: Deployment
+
+metadata:
+  name: trace-retrieval
+    
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: trace-retrieval
+  template:
+    metadata:
+      labels:
+        app: trace-retrieval
+    spec:
+      containers:
+      - name: trace-retrieval
+        image: 172.16.1.20:5000/trace-retrieval-microservice
+        ports:
+        - containerPort: 5000
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trace-retrieval-microservice/deployment/loadbalancer.yml

+apiVersion: v1
+kind: Service
+
+metadata:
+  name: trace-retrieval-endpoint
+  
+spec:
+  type: LoadBalancer
+  externalIPs:
+    - 143.205.173.36
+  selector:
+      app: trace-retrieval
+  ports:
+    - name: http
+      port: 80
+      targetPort: 5000
+      nodePort: 30001
+      protocol: TCP
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