Add ability to generate a log file

Signed-off-by: acg5159 <acg5159@gmail.com>

Dockerfile

@@ -38,7 +38,12 @@ RUN dpkg -i /libgl1-mesa-dri.deb \
     # Create flaresolverr user
     && useradd --home-dir /app --shell /bin/sh flaresolverr \
     && mv /usr/bin/chromedriver chromedriver \
-    && chown -R flaresolverr:flaresolverr .
+    && chown -R flaresolverr:flaresolverr . \
+    # Create config dir
+    && mkdir /config \
+    && chown flaresolverr:flaresolverr /config
+
+VOLUME /config
 
 # Install Python dependencies
 COPY requirements.txt .

docker-compose.yml

@@ -7,9 +7,12 @@ services:
     container_name: flaresolverr
     environment:
       - LOG_LEVEL=${LOG_LEVEL:-info}
+      - LOG_FILE=flaresolver.log
       - LOG_HTML=${LOG_HTML:-false}
       - CAPTCHA_SOLVER=${CAPTCHA_SOLVER:-none}
       - TZ=Europe/London
     ports:
       - "${PORT:-8191}:8191"
+    volumes:
+      - /var/lib/flaresolver:/config
     restart: unless-stopped

src/flaresolverr.py

@@ -76,6 +76,7 @@ if __name__ == "__main__":
 
     # validate configuration
     log_level = os.environ.get('LOG_LEVEL', 'info').upper()
+    log_file = os.environ.get('LOG_FILE', None)
     log_html = utils.get_config_log_html()
     headless = utils.get_config_headless()
     server_host = os.environ.get('HOST', '0.0.0.0')
@@ -93,6 +94,15 @@ if __name__ == "__main__":
             logging.StreamHandler(sys.stdout)
         ]
     )
+    if log_file:
+        if not log_file.startswith("/config"):
+            log_file = "/config/" + log_file
+        log_file = os.path.realpath(log_file)
+        log_path = os.path.dirname(log_file)
+        os.makedirs(log_path, exist_ok=True)
+
+        logging.getLogger().addHandler(logging.FileHandler(log_file))
+
     # disable warning traces from urllib3
     logging.getLogger('urllib3').setLevel(logging.ERROR)
     logging.getLogger('selenium.webdriver.remote.remote_connection').setLevel(logging.WARNING)