Add a virtual EDGE which spawns http simulators (#8)

* Add dockerized python simulators

* Create an EDGE gateway via dind

* Fix README.md title

docker/docker-compose.yml

@@ -44,3 +44,14 @@ services:
     ports:
       - "15672:15672"
       - "5672:5672"
+
+  edge:
+    <<: *service_default
+    image: docker:dind
+    privileged: true
+    environment:
+      DOCKER_TLS_CERTDIR:
+    networks:
+      - net
+    ports:
+      - "127.0.0.1:22375:2375"

docker/edge/README.md

@@ -0,0 +1,6 @@
+# EDGE device simulator (via docker-in-docker)
+
+```bash
+export DOCKER_HOST='127.0.0.1:22375'
+docker-compose -f docker-compose.edge.yml up -d --scale device-http=4
+```

docker/edge/docker-compose.yml

@@ -0,0 +1,19 @@
+version: "3.7"
+
+networks:
+  localnet:
+
+x-op-service-default: &service_default
+  restart: unless-stopped
+  init: true
+
+services:
+  device-http:
+    <<: *service_default
+    image: daniviga/freedcs-device-http
+    environment:
+      IOT_HOST: "http://192.168.10.123:8000"
+      # IOT_SERIAL: "abcd1234"
+      # IOT_DELAY: 10
+    networks:
+      - localnet

docker/simulators/Dockerfile.http

@@ -0,0 +1,6 @@
+FROM python:3.8-alpine
+
+RUN pip3 install urllib3
+COPY ./simulator_http.py /opt/freedcs/simulator_http.py
+
+ENTRYPOINT ["python3", "/opt/freedcs/simulator_http.py"]

docker/simulators/simulator_http.py

@@ -0,0 +1,58 @@
+#!/usr/bin/env python3
+
+import os
+import json
+import string
+import random
+import datetime
+import urllib3
+from time import sleep
+
+http = urllib3.PoolManager()
+
+
+def post_json(host, url, data):
+    encoded_data = json.dumps(data).encode('utf8')
+
+    while True:
+        try:
+            retry = False
+            r = http.request(
+                'POST',
+                host + url,
+                body=encoded_data,
+                headers={'content-type': 'application/json'})
+            return r
+        except urllib3.exceptions.MaxRetryError:
+            pass
+
+
+def main():
+    host = os.environ.get('IOT_HOST', 'http://127.0.0.1:8000')
+    subscribe = '/api/subscribe/'
+    telemetry = '/telemetry/'
+    delay = int(os.environ.get('IOT_DELAY', 10))
+
+    serial = os.environ.get('IOT_SERIAL')
+    if serial is None:
+        serial = ''.join(
+            random.choices(string.ascii_lowercase + string.digits, k=8))
+
+    data = {'serial': serial}
+    post_json(host, subscribe, data)
+
+    data = {
+        'device': serial,
+        'clock': int(datetime.datetime.now().timestamp()),
+        'payload': {
+            'data': 'sample_data'
+        }
+    }
+
+    while True:
+        post_json(host, telemetry, data)
+        sleep(delay)
+
+
+if __name__ == "__main__":
+    main()