Added first run of kafka logging

docker-compose.yml

@@ -0,0 +1,43 @@
+version: "3"
+
+services:
+  kafka:
+    container_name: kafka
+    hostname: kafka
+    image: bitnami/kafka:latest
+    ports:
+      # Flip the ports around, external gets default.
+      - "9092:9094"
+      - "9094:9092"
+    networks:
+      - kafka-internal
+    volumes:
+      - "kafka_data:/bitnami"
+    environment:
+      # https://hub.docker.com/r/bitnami/kafka/
+      - ALLOW_PLAINTEXT_LISTENER=yes
+      - KAFKA_CFG_LISTENERS=PLAINTEXT://:9092,CONTROLLER://:9093,EXTERNAL://:9094
+      - KAFKA_CFG_ADVERTISED_LISTENERS=PLAINTEXT://kafka:9092,EXTERNAL://localhost:9094
+      - KAFKA_CFG_LISTENER_SECURITY_PROTOCOL_MAP=CONTROLLER:PLAINTEXT,EXTERNAL:PLAINTEXT,PLAINTEXT:PLAINTEXT
+      - KAFKA_CFG_AUTO_CREATE_TOPICS_ENABLE=true
+
+  kafka-ui:
+    container_name: kafka-ui
+    image: provectuslabs/kafka-ui:latest
+    ports:
+      - 8080:8080
+    networks:
+      - kafka-internal
+    environment:
+      # https://docs.kafka-ui.provectus.io/configuration/misc-configuration-properties
+      KAFKA_CLUSTERS_0_NAME: test
+      KAFKA_CLUSTERS_0_BOOTSTRAPSERVERS: kafka:9092
+    depends_on:
+      - kafka
+
+volumes:
+  kafka_data:
+    driver: local
+
+networks:
+  kafka-internal:

kafkalogging.py

@@ -0,0 +1,64 @@
+from kafka import KafkaProducer
+import subprocess
+import os
+
+kafka_servers = ['localhost:9092']
+producers = {}
+
+
+# Do anything that might take more than a few ms early, otherwise you hit overflow errors
+def prep_io(process, process_name=None):
+    for pipe_name,pipe in {'stdout':process.stdout, 'stderr':process.stderr}.items():
+        if pipe is None:
+            continue
+
+        if os.get_blocking(pipe.fileno()):
+            os.set_blocking(pipe.fileno(), False)
+
+        if process.pid not in producers:
+            producers[process.pid] = {}
+        if pipe_name not in producers[process.pid]:
+            producers[process.pid][pipe_name] = KafkaProducer(
+                bootstrap_servers=kafka_servers,
+                max_block_ms=200
+            )
+
+
+# Inspired by gist:
+# https://gist.github.com/krzemienski/8c7e8e76c8652984cca0da3fea5b5368
+def check_io(process, process_name=None):
+    for pipe_name,pipe in {'stdout':process.stdout, 'stderr':process.stderr}.items():
+        if pipe is None:
+            continue
+
+        topic_name = f"{process.pid if process_name is None else process_name}-{pipe_name}"
+
+        while True:
+            # The python official docs recommend using Popen.communicate() instead of reading
+            # from the pipes directly. Using Popen.communicate is a blocking call though,
+            # which would stall threads for processes producing no output.
+            output = pipe.readline()
+            if output:
+                producers[process.pid][pipe_name].send(topic_name, value=output)
+            else:
+                break
+
+        producers[process.pid][pipe_name].flush()
+
+
+
+if __name__ == '__main__':
+    import time
+
+    ping = subprocess.Popen(
+        [
+            '/usr/bin/ping',
+            '1.1.1.1',
+        ],
+        stdout=subprocess.PIPE,
+        stderr=subprocess.PIPE
+    )
+
+    while True:
+        check_io(ping, 'ping')
+        time.sleep(0.1)

radio.py

@@ -7,6 +7,7 @@ import subprocess
 import struct
 from soapyhelpers import *
 from samplerates import *
+from kafkalogging import *
 
 
 class Radio:
@@ -131,6 +132,11 @@ class Radio:
                     *self.buffer[:read_size])
                 )
 
+            # handle subprocess logs
+            check_io(self.demod, f"{self.name}-demod")
+            check_io(self.playback, f"{self.name}-playback")
+
+
         self._cleanup_stream()
 
     def _init_stream(self):
@@ -140,17 +146,20 @@ class Radio:
                 '-f', 'rtsp', f"rtsp://localhost{self._stream_path()}"
             ],
             stdin=subprocess.PIPE,
-            stdout=subprocess.DEVNULL,
-            stderr=subprocess.DEVNULL
+            stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE
         )
 
         self.demod = subprocess.Popen(
             ['/usr/bin/python3', 'fm_demod.py', '-f', 'CS16', '-s', str(self.sample_rate), '-d', str(self.output_rate)],
             stdin=subprocess.PIPE,
             stdout=self.playback.stdin,
-            stderr=subprocess.DEVNULL
+            stderr=subprocess.PIPE
         )
 
+        prep_io(self.demod, f"{self.name}-demod")
+        prep_io(self.playback, f"{self.name}-playback")
+
         self.buffer = np.array([0] * Radio.SAMPLES * 2, FORMATS[Radio.FORMAT].numpy)
         self.stream = self.device.setupStream(soapy.SOAPY_SDR_RX, FORMATS[Radio.FORMAT].soapy)
         result = self.device.activateStream(self.stream)

scripts/connect.sh

@@ -0,0 +1,34 @@
+#! /bin/bash
+
+set -e
+
+
+server="localhost:5000"
+radio="sdrplay"
+frequency="105.5M"
+
+trap deinit INT
+
+deinit() {
+    curl $server/radio/$radio/end
+    curl $server/radio/$radio/disconnect
+    #kill $pid
+    killall ffplay
+    echo -n ""
+}
+
+init() {
+    curl $server/radio/$radio/connect
+    curl $server/radio/$radio/configure/$frequency
+    curl $server/radio/$radio/start
+}
+
+init
+echo "Waiting for stream to become active..."
+sleep 3
+ffplay -nodisp -hide_banner rtsp://localhost:8554/radio/sdrplay &
+pid=$!
+
+while true; do
+    sleep 1
+done