Rewritten Log Handling

* Now you can set log_level to your needs.
See README.md for Details.
* Added Option to delete log file on restarts
* develop_log: true
*
* Updated README.md accordingly

Signed-off-by: Stephan Wendel <me@stephanwe.de>

README.md

@@ -121,11 +121,43 @@ This last 2 should be pretty obvious :)
 
 There are two more existing parameters,
 
-    log_method: debug
+    log_level:
 
 **This parameter _has_ to reside under [webcamd] section!**
 
-This forces webcamd to spit out more camera informations.\
+You can choose:
+    
+    log_level: quiet
+
+This Option shows a bare minimum Logfile.\
+For example:
+
+    [11/02/21 20:47:52] webcamd: webcamd - A webcam Service for multiple Cams and Stream Services.
+    [11/02/21 20:47:53] webcamd: Version: v0.1.3-9-g7e278cd
+    [11/02/21 20:47:53] webcamd: Prepare Startup ...
+    [11/02/21 20:47:53] webcamd: INFO: Checking Dependencys
+    [11/02/21 20:47:53] webcamd: Dependency: 'crudini' found in /usr/bin/crudini.
+    [11/02/21 20:47:53] webcamd: Dependency: 'mjpg_streamer' found in /usr/local/bin/mjpg_streamer.
+    [11/02/21 20:47:53] webcamd: Dependency: 'ustreamer' found in /usr/local/bin/ustreamer.
+    [11/02/21 20:47:53] webcamd: Dependency: 'v4l2rtspserver' found in /usr/local/bin/v4l2rtspserver.
+    [11/02/21 20:47:54] webcamd: INFO: Detect available Cameras
+    [11/02/21 20:47:54] webcamd: INFO: Found 2 available Camera(s)
+    [11/02/21 20:47:54] webcamd: /dev/v4l/by-id/usb-USB_Camera_USB_Camera_SN0001-video-index0 -> /dev/video1
+    [11/02/21 20:47:54] webcamd: Detected 'Raspicam' Device -> /dev/video0
+    [11/02/21 20:47:54] webcamd: Try to start configured Cams / Services...
+    [11/02/21 20:47:55] webcamd: INFO: Configuration of Section [cam 1] looks good. Continue...
+    [11/02/21 20:47:55] webcamd: Starting mjpeg-streamer with Device /dev/video0 ...
+    [11/02/21 20:48:03] webcamd: INFO: Configuration of Section [cam usb_black] looks good. Continue...
+    [11/02/21 20:48:04] webcamd: Starting ustreamer with Device /dev/v4l/by-id/usb-USB_Camera_USB_Camera_SN0001-video-index0 ...
+    [11/02/21 20:48:11] webcamd: ... Done!
+
+The next option is
+
+    log_level: verbose
+
+This gives you a little more Informations.
+It prints out you existing webcam.conf and shows
+a detailed info about your configured ( and connected ) cams.\
 Like that:
 
     [10/24/21 02:46:00] webcamd: INFO: Detect available Cameras
@@ -163,8 +195,24 @@ Like that:
 
 This is useful to determine what the Hardware Encoder of your Camera is capable of.\
 In this case a "cheap" raspicam for about 7€ was used.\
-But it has a downside, everytime you restart webcamd, it will delete the Logfile!
-So, truly made for Debugging purposes.
+So, truly made for 'Helper for Setup' purposes.
+
+If you want to get the full Details, please use
+
+    log_level: debug
+
+This will show you barely the same as 'verbose' but it prints also your\
+configured Start Parameters ( and the defaults ), also it shows\
+the Output of your choosen Streamer.\
+This option ist more for debugging purposes and has a tendency to overwhelm you if you are not familiar with that.
+
+---
+
+Another Option that affects the 'logging' behavior is
+
+    develop_log: true
+
+If you enable that option, everytime you restart, your existing log file will be deleted.
 
 ---
 

webcamd

@@ -50,15 +50,28 @@ function init_log_entry {
     log_msg "Prepare Startup ..."
 }
 
-function log_method {
-    local method logfile
-    logfile="$(get_param webcamd log_path | sed "s#^~#$HOME#gi")"
-    method="$(get_param "webcamd" log_method 2> /dev/null)"
-    if [ "${method}" = "debug" ]; then
+function log_level {
+    local loglevel
+    loglevel="$(get_param webcamd log_level 2> /dev/null)"
+    # Set default log_level to quiet
+    if [ -z "${loglevel}" ] || [[ "${loglevel}" != @(quiet|verbose|debug) ]];
+    then
+        echo "quiet"
+    else
+        echo "${loglevel}"
+    fi
+}
+
+function develop {
+    local devel logfile
+    logfile="$(get_param "webcamd" log_path | sed "s#^~#$HOME#gi")"
+    devel="$(get_param "webcamd" develop_log 2> /dev/null)"
+    if [ "${devel}" = "true" ]; then
         rm -rf "${logfile}"
     fi
 }
 
+
 function log_msg {
     local msg logfile prefix
     msg="${1}"
@@ -74,10 +87,9 @@ function log_msg {
 
 #call '| log_output "<prefix>"'
 function log_output {
-    local prefix debug
+    local prefix
     prefix="DEBUG: ${1}"
-    debug="$(get_param "webcamd" debug_log 2> /dev/null)"
-    if [ "${debug}" == "true" ]; then
+    if [ "$(log_level)" == "debug" ]; then
         while read -r line; do
             log_msg "${prefix}: ${line}"
         done
@@ -111,7 +123,7 @@ function print_cams {
         raspicam="$(v4l2-ctl --list-devices |  grep -A1 -e 'mmal' | \
         awk 'NR==2 {print $1}')"
         log_msg "Detected 'Raspicam' Device -> ${raspicam}"
-        if [ "${debug}" == "true" ]; then
+        if [ ! "$(log_level)" = "quiet" ]; then
             list_cam_formats "${raspicam}"
         fi
     fi
@@ -124,9 +136,10 @@ function initial_check {
     check_dep "mjpg_streamer"
     check_dep "ustreamer"
     check_dep "v4l2rtspserver"
-    log_msg "INFO: Checking Configfile"
     if [ -z "$(check_cfg "${WEBCAMD_CFG}")" ]; then
-        print_cfg
+        if [ "$(log_level)" != "quiet" ]; then
+            print_cfg
+        fi
     fi
     log_msg "INFO: Detect available Cameras"
     print_cams
@@ -177,7 +190,7 @@ function detect_avail_cams {
         echo "${avail}" | while read -r i; do
             realpath=$(readlink -e ${i})
             log_msg "${i} -> ${realpath}"
-            if [ "${debug}" == "true" ]; then
+            if [ "$(log_level)" != "quiet" ]; then
                 list_cam_formats "${i}"
             fi
         done
@@ -487,7 +500,7 @@ done
 trap 'shutdown' 1 2 3 15
 trap 'err_exit $? $LINENO' ERR
 
-log_method
+develop
 init_log_entry
 initial_check
 construct_streamer