commit 7510dc8b6f20cccb4112859f2cbeaa2f7776fbde
Author: Lauri Võsandi <lauri@k-space.ee>
Date:   Sun Feb 13 10:09:18 2022 +0200

    Initial commit

diff --git a/.drone.yml b/.drone.yml
new file mode 100644
index 0000000..7e9134b
--- /dev/null
+++ b/.drone.yml
@@ -0,0 +1,16 @@
+---
+kind: pipeline
+type: kubernetes
+name: default
+
+steps:
+- name: docker
+  image: plugins/docker
+  settings:
+    repo: harbor.k-space.ee/${DRONE_REPO}
+    registry: harbor.k-space.ee
+    mtu: 1300
+    username:
+      from_secret: docker_username
+    password:
+      from_secret: docker_password
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..9be215a
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,20 @@
+FROM ubuntu
+WORKDIR /app
+ENV DEBIAN_FRONTEND=noninteractive
+RUN apt-get update && apt-get install -y \
+    gstreamer1.0-libav \
+    gstreamer1.0-plugins-bad \
+    gstreamer1.0-plugins-base \
+    gstreamer1.0-plugins-good \
+    gstreamer1.0-plugins-ugly \
+    gstreamer1.0-tools \
+    python3-gevent \
+    python3-numpy \
+    python3-opencv \
+    python3-pip \
+ && apt-get clean
+RUN pip3 install prometheus_client aiohttp sanic==21.6.2 sanic_prometheus motor kubernetes
+COPY camtiler.py /app
+ENTRYPOINT /app/camtiler.py
+EXPOSE 5001
+ENV PYTHONUNBUFFERED=1
diff --git a/camtiler.py b/camtiler.py
new file mode 100755
index 0000000..605bf7c
--- /dev/null
+++ b/camtiler.py
@@ -0,0 +1,185 @@
+#!/usr/bin/python3
+
+import aiohttp
+import asyncio
+import cv2
+import io
+import numpy as np
+import os
+import socket
+import sys
+from datetime import datetime
+from kubernetes import client, config
+from math import ceil
+from prometheus_client import Counter, Gauge
+from sanic import Sanic, response
+from sanic.response import stream
+from sanic_prometheus import monitor
+
+targets = [(j,j) for j in sys.argv[1:]]
+if not targets:
+    # If no targets are specified, fall back to Kube API
+    config.load_kube_config()
+    v1 = client.CoreV1Api()
+    for i in v1.list_namespaced_service("camtiler", label_selector="component=camdetect").items:
+        app.ctx.frames[i.metadata.name] = None
+        url = "http://%s:%d/bypass" % (i.metadata.name, i.spec.ports[0].port)
+        targets.append((i.metadata.name, url))
+
+print("Running with following targets:")
+for name, url in targets:
+    print(url)
+
+counter_dropped_bytes = Counter(
+    "camtiler_client_dropped_bytes",
+    "Bytes that were not not handled or part of actual JPEG frames")
+counter_rx_bytes = Counter(
+    "camtiler_client_rx_bytes",
+    "Bytes received over HTTP stream")
+counter_tx_bytes = Counter(
+    "camtiler_client_tx_bytes",
+    "Bytes transmitted over HTTP streams")
+counter_rx_frames = Counter(
+    "camtiler_client_rx_frames",
+    "Frames received")
+counter_tx_frames = Counter(
+    "camtiler_client_tx_frames",
+    "Frames transmitted")
+counter_tx_events = Counter(
+    "camtiler_client_tx_events",
+    "Events emitted")
+counter_eos = Counter(
+    "camtiler_client_eos",
+    "Count of End of Stream occurrences")
+counter_timeout_errors =  Counter(
+    "camtiler_client_timeout_errors",
+    "Upstream connection timeout errors")
+counter_cancelled_errors =  Counter(
+    "camtiler_client_cancelled_errors",
+    "Upstream connection cancelled errors")
+counter_incomplete_read_errors =  Counter(
+    "camtiler_client_incomplete_read_errors",
+    "Upstream incomplete read errors")
+
+app = Sanic("camtiler")
+
+STREAM_RESPONSE = \
+b"""
+--frame
+Content-Type: image/jpeg
+
+"""
+
+MERGED_SUBSAMPLE=3
+
+# Consider camera gone after 5sec
+TIMEOUT = 5.0
+
+# Blank frame
+BLANK = np.full((720 // MERGED_SUBSAMPLE, 1280 // MERGED_SUBSAMPLE, 3), 0)
+
+
+def tilera(iterable, filler):
+    hstacking = ceil(len(iterable) ** 0.5)
+    vstacking = ceil(len(iterable) / hstacking)
+    rows = []
+    for j in range(0, vstacking):
+        row = []
+        first_frame = True
+        for i in range(0, hstacking):
+            try:
+                frame = iterable[i + hstacking * j]
+            except IndexError:
+                frame = filler
+
+            if not first_frame:
+                row.append(np.full((len(frame), 1, 3), 0))
+            first_frame = False
+            row.append(frame)
+        stacked = np.hstack(row)
+        rows.append(stacked)
+    return np.vstack(rows)
+
+
+async def client_connect(name, resp):
+    buf = b""
+    print("Upstream connection opened with status:", resp.status)
+    async for data, end_of_http_chunk in resp.content.iter_chunks():
+        counter_rx_bytes.inc(len(data))
+        if end_of_http_chunk:
+            counter_eos.inc()
+            break
+
+        if buf:
+            # seek end
+            marker = data.find(b'\xff\xd9')
+            if marker < 0:
+                buf += data
+                continue
+            else:
+                blob = np.frombuffer(buf + data[:marker+2], dtype=np.uint8)
+                img = cv2.imdecode(blob, cv2.IMREAD_UNCHANGED)
+                app.ctx.frames[name] = img
+                data = data[marker+2:]
+                buf = b""
+                counter_rx_frames.inc()
+
+        # seek begin
+        marker = data.find(b'\xff\xd8')
+        if marker >= 0:
+            buf = data[marker:]
+        else:
+            counter_dropped_bytes.inc(len(data))
+
+
+async def client(name, url):
+    print("Opening upstream connection to %s" % url)
+    async with aiohttp.ClientSession() as session:
+        async with session.get(url) as resp:
+            try:
+                await client_connect(name, resp)
+            except asyncio.TimeoutError:
+                counter_timeout_errors.inc()
+            except asyncio.CancelledError:
+                counter_cancelled_errors.inc()
+            except asyncio.IncompleteReadError:
+                counter_incomplete_read_errors.inc()
+
+
+@app.route("/tiled")
+async def stream_wrapper(request):
+    async def stream_tiled(response):
+        while True:
+            frames = [value for key, value in sorted(app.ctx.frames.items())]
+            img = tilera(frames, np.vstack([BLANK, np.zeros((30, 1280 // MERGED_SUBSAMPLE, 3))]))
+            _, jpeg = cv2.imencode(".jpg", img, (cv2.IMWRITE_JPEG_QUALITY, 80))
+            data = STREAM_RESPONSE + jpeg.tobytes()
+            await response.write(data)
+            counter_tx_bytes.inc(len(data))
+            counter_tx_frames.inc()
+            await asyncio.sleep(0.2)
+
+    return response.stream(
+        stream_tiled,
+        content_type='multipart/x-mixed-replace; boundary=frame'
+    )
+
+@app.listener('before_server_start')
+async def setup_db(app, loop):
+    app.ctx.last_frame = None
+    app.ctx.event_frame = asyncio.Event()
+    app.ctx.frames = {}
+    app.ctx.avg = None
+    app.ctx.motion_frames = 0
+    app.ctx.motion_start = None
+    app.ctx.motion_end = None
+    for name, url in targets:
+        app.ctx.frames[name] = None
+        task = asyncio.create_task(client(name, url))
+
+monitor(app).expose_endpoint()
+
+try:
+    app.run(port=5001)
+except KeyboardInterrupt:
+    asyncio.get_event_loop().close()
diff --git a/docker-compose.yml b/docker-compose.yml
new file mode 100644
index 0000000..7ceddf4
--- /dev/null
+++ b/docker-compose.yml
@@ -0,0 +1,21 @@
+version: '3.7'
+
+# All keys here are for dev instance only, do not put prod keys here
+# To override and use inventory from prod use .env file
+
+services:
+  camtiler:
+    restart: always
+    network_mode: host
+    build:
+      context: .
+    entrypoint: /app/camtiler.py
+    command: http://127.0.0.1:8080?action=stream http://127.0.0.2:8080?action=stream http://127.0.0.3:8080?action=stream http://127.0.0.4:8080?action=stream
+
+  mjpg-streamer:
+    network_mode: host
+    restart: always
+    image: kvaps/mjpg-streamer
+    devices:
+      - /dev/video0
+    command: -i "/usr/lib64/input_uvc.so -y -d /dev/video0 -r 1280x720 -f 30" -o "output_http.so"