SCRIPT_TIME_START=$(date +%Y%m%dT%H%M%S.%N);
PATH="$HOME/.local/bin:$PATH"; # Add "$(systemd-path user-binaries)" path in case apps saved there
SCRIPT_HOSTNAME=$(hostname); # Save hostname of system running this script.
-SCRIPT_VERSION="0.4.3"; # Define version of script.
+SCRIPT_VERSION="0.4.4-alpha"; # Define version of script.
SCRIPT_NAME="bkgpslog"; # Define basename of script file.
SCRIPT_URL="https://gitlab.com/baltakatei/ninfacyzga-01"; # Define wesite hosting this script.
AGE_VERSION="1.0.0-beta2"; # Define version of age (encryption program)
declare -Ag fileRollCall # Associative array for storing file status
declare -Ag dirRollCall # Associative array for storing dir status
declare -a argRecPubKeys # for processArguments function
+# declare -a errorHistory # for correcting buffer lag
## Initialize variables
OPTION_VERBOSE=""; OPTION_ENCRYPT=""; OPTION_COMPRESS=""; OPTION_TMPDIR="";
+errResetx10e3=0; BUFFER_TTL_ADJ_FLOAT="";
+### PID Control factors
+K_P=10; # Gain for compensating buffer round lag
+T_I=2; # Consider this number of past buffer rounds to eliminate error
+T_D=1; # Predict value this number of buffer rounds into the future
#===BEGIN Declare local script functions===
checkapp() {
# Return error if no condition matched.
return 1;
} # Validates strings
+timeEpochNS() {
+ # Desc: Get epoch nanoseconds
+ # Usage: timeEpochNS
+ # Version 0.2.2
+ # Input: arg1: 'date'-parsable timestamp string (optional)
+ # Output: Nanoseconds since 1970-01-01
+ # Depends: date 8, yell()
+ # Ref/Attrib: Force base 10 Bash arith with '10#'. https://stackoverflow.com/a/24777667
+ local TIME_CURRENT TIME_INPUT TIME_EPOCH_FLOAT TIME_EPOCH_NSFRAC
+ local TIME_EPOCH_NS
+
+ argTime="$1";
+
+ # Get Current Time
+ TIME_CURRENT="$(date --iso-8601=ns)"; # Produce `date`-parsable current timestamp with resolution of 1 nanosecond.
+
+ # Decide to parse current or supplied time
+ ## Check if time argument empty
+ if [[ -z "$argTime" ]]; then
+ ## T: Time argument empty, use current time
+ TIME_INPUT="$TIME_CURRENT";
+ else
+ ## F: Time argument exists, validate time
+ if date --date="$argTime" 1>/dev/null 2>&1; then
+ ### T: Time argument is valid; use it
+ TIME_INPUT="$argTime";
+ else
+ ### F: Time argument not valid; exit
+ yell "ERROR:Invalid time argument supplied. Exiting."; exit 1;
+ fi;
+ fi;
+ # Construct and deliver nanoseconds since 1970-01-01
+ TIME_EPOCH_FLOAT="$(date --date="$TIME_INPUT" +%s.%N)"; # Save ssss.NNNNNNNNN
+ TIME_EPOCH_INT="$(echo "$TIME_EPOCH_FLOAT" | cut -d. -f1)"; # Get ssss
+ TIME_EPOCH_NSFRAC="$(echo "$TIME_EPOCH_FLOAT" | cut -d. -f2)"; # Get NNNNNNNNN
+ TIME_EPOCH_NS="$(( (10#"$TIME_EPOCH_INT" * 10**9) + (10#"$TIME_EPOCH_NSFRAC") ))";
+ echo "$TIME_EPOCH_NS";
+} # Nanoseconds since 1970-01-01
+magicBufferSleepPID() {
+ # Desc: Compensates for lag so buffer rounds start every BUFFER_TTL seconds
+ # Input: vars: BUFFER_TTL, errResetx10e3, K_P, T_I, T_D
+ # # Input: array: errorHistory
+ # Output: vars: BUFFER_TTL_ADJ_FLOAT
+ # Re/Attrib: https://en.wikipedia.org/wiki/PID_controller#Standard_versus_parallel_(ideal)_form
+ local BUFFER_TTL_NS
+ local timeBufferStartNS timeBufferStartNSExp errNS errNSx10e3
+ local errResetx10e3 errRatex10e3 ADJ BUFFER_TTL_ADJ_NS BUFFER_TTL_ADJ_INT
+ local BUFFER_TTL_ADJ_FLOATFRAC
+ # local errorHistorySize
+
+ # ## Define errorHistorySize
+ # errorHistorySize=100;
+ ## Define BUFFER_TTL in nanoseconds
+ BUFFER_TTL_NS=$((BUFFER_TTL * 10**9));
+
+ # Calculate Error, errNS, in nanoseconds
+ ## Get current time
+ timeBufferStartNS="$(timeEpochNS)";
+ ## Calculate expected time (from start time, current buffer round number, nominal BUFFER_TTL)
+ timeBufferStartNSExp="$(( (timeBufferFirstNS) + (BUFFER_TTL_NS * bufferRound) ))";
+ ## Calculate error (diff between timeBufferStartNSExp and timeBufferStartNS; usually negative)
+ errNS="$(( timeBufferStartNSExp - timeBufferStartNS ))";
+ errNSx10e3="$((errNS*10**3))";
+ # ## Append error to errorHistory
+ # errorHistory+=("errNS");
+ # ### Trim errorHistory array if over errorHistorySize
+ # while [[ "${#errorHistory[@]}" -gt "errorHistorySize" ]]; then do
+ # unset "errorHistory[0]"; # remove oldest entry, creating sparse array
+ # errorHistory=("${errorHistory[@]}"); # reindex sparse array
+ # vbm "STATUS:Trimmed errorHistory array. Entry count:${#errorHistory[@]}";
+ # done;
+
+ # Calculate errReset in nanoseconds^2
+ ## errReset = int(errHistory(t),wrt(delta_BUFFER_TTL))
+ ## Integrate errorHistory with respect to time
+ # for value in "${errorHistory[@]}"; do
+ # errReset=$(( errReset + ( value*BUFFER_TTL_NS ) ));
+ # done;
+ errResetx10e3="$(( ( errResetx10e3 + ( errNS * BUFFER_TTL_NS ) )*10**3 ))";
+
+ # Calculate errRate in nanoseconds per 1000 nanoseconds
+ errRatex10e3="$(( ( errNSx10e3 ) / BUFFER_TTL_NS ))";
+
+ # Calculate PID control signal
+ ## ADJ = K_P * (errNS + errReset/T_I + errRate*T_D)
+ ADJ="$((K_P*(errNSx10e3 + (errResetx10e3/T_I) + (errRatex10e3*T_D) )/10**3))";
+
+ # Calculate BUFFER_TTL_ADJ_FLOAT from ADJ (ns)
+ ## Calculate BUFFER_TTL_ADJ in nanoseconds (BUFFER_TTL_ADJ_NS = BUFFER_TTL_NS + ADJ)
+ BUFFER_TTL_ADJ_NS="$((BUFFER_TTL_NS + ADJ))";
+ ## Calculate integer seconds
+ BUFFER_TTL_ADJ_INT="$((BUFFER_TTL_ADJ_NS/(10**9)))";
+ ## Calculate nanosecond remainder
+ BUFFER_TTL_ADJ_FLOATFRAC="$((BUFFER_TTL_NS - (BUFFER_TTL_ADJ_INT*(10**9)) ))";
+ ## Form float BUFFER_TTL_ADJ_FLOAT
+ BUFFER_TTL_ADJ_FLOAT="$BUFFER_TTL_ADJ_INT"."$BUFFER_TTL_ADJ_FLOATFRAC";
+ vbm "STATUS:Calculated adjusted BUFFER_TTL (seconds):$BUFFER_TTL_ADJ_FLOAT";
+} # Calc BUFFER_TTL_ADJ_FLOAT so buffer starts every BUFFER_TTL seconds
magicWriteVersion() {
# Desc: Appends time-stamped VERSION to PATHOUT_TAR
# Usage: magicWriteVersion
} # bkgpslog: write version data to PATHOUT_TAR via appendArgTar()
magicGatherWriteBuffer() {
# Desc: bkgpslog-specific meta function for writing data to DIR_TMP then appending each file to PATHOUT_TAR
- # Inputs: PATHOUT_TAR FILEOUT_{NMEA,GPX,KML} CMD_CONV_{NMEA,GPX,KML} CMD_{COMPRESS,ENCRYPT} DIR_TMP,
- # Inputs: BUFFER_TTL bufferTTL_STR SCRIPT_HOSTNAME CMD_COMPRESS_SUFFIX CMD_ENCRYPT_SUFFIX
- # Depends: yell, try, vbm, appendArgTar, tar
- local FN="${FUNCNAME[0]}";
- wait; # Wait to avoid collision with older magicWriteBuffer() instances (see https://www.tldp.org/LDP/abs/html/x9644.html )
+ # Inputs: vars: PATHOUT_TAR FILEOUT_{NMEA,GPX,KML} CMD_CONV_{NMEA,GPX,KML} CMD_{COMPRESS,ENCRYPT} DIR_TMP,
+ # Inputs: vars: BUFFER_TTL bufferTTL_STR SCRIPT_HOSTNAME CMD_COMPRESS_SUFFIX CMD_ENCRYPT_SUFFIX
+ # Output: file: (PATHOUT_TAR)
+ # Depends: yell(), try(), vbm(), appendArgTar(), tar 1, sleep 8, checkMakeTar()
+ # Depends: magicWriteVersion(), appendFileTar()
+ local FN
+
+ # Debug:Get function name
+ FN="${FUNCNAME[0]}";
+
# Create buffer file with unique name
PATHOUT_BUFFER="$DIR_TMP/buffer$SECONDS";
# Fill buffer
if [[ $? -eq 1 ]] || [[ $? -eq 2 ]]; then magicWriteVersion; fi
# Write bufferBash to PATHOUT_TAR
+ wait; # Wait to avoid collision with older magicWriteBuffer() instances (see https://www.tldp.org/LDP/abs/html/x9644.html )
appendFileTar "$PATHOUT_BUFFER" "$FILEOUT_NMEA" "$PATHOUT_TAR" "$DIR_TMP" "$CMD_CONV_NMEA" "$CMD_COMPRESS" "$CMD_ENCRYPT"; # Write NMEA data
appendFileTar "$PATHOUT_BUFFER" "$FILEOUT_GPX" "$PATHOUT_TAR" "$DIR_TMP" "$CMD_CONV_GPX" "$CMD_COMPRESS" "$CMD_ENCRYPT"; # Write GPX file
appendFileTar "$PATHOUT_BUFFER" "$FILEOUT_KML" "$PATHOUT_TAR" "$DIR_TMP" "$CMD_CONV_KML" "$CMD_COMPRESS" "$CMD_ENCRYPT"; # Write KML file
done
#### Write updated recPubKeysValid array to recPubKeysValid if no failure detected
if ! [[ "$updateRecipients" = "false" ]]; then
- recPubKeysValid=("${candRecPubKeysValid[@]}") && vbm "STATUS:Wrote candRecPubkeysValid to recPubKeysValid:\"${recPubKeysValid[@]}\"";
+ recPubKeysValid=("${candRecPubKeysValid[@]}") && vbm "STATUS:Wrote candRecPubkeysValid to recPubKeysValid:\"${recPubKeysValid[*]}\"";
fi;
else
yell "ERROR:$0:Recipient directory $argRecDir does not exist. Exiting."; exit 1;
fi;
done
vbm "DEBUG:Finished processing argRecPubKeys array";
- vbm "STATUS:Array of validated pubkeys:${recPubKeysValid[@]}";
- recPubKeysValidStatic="${recPubKeysValid[@]}"; # Save static image of pubkeys validated by this function
+ vbm "STATUS:Array of validated pubkeys:${recPubKeysValid[*]}";
+ recPubKeysValidStatic=("${recPubKeysValid[@]}"); # Save static image of pubkeys validated by this function
## Form age command string
CMD_ENCRYPT="age ""$recipients " && vbm "CMD_ENCRYPT:$CMD_ENCRYPT";
CMD_CONV_KML="gpsbabel -i nmea -f - -o kml -F - " && vbm "STATUS:Set CMD_CONV_KML to:$CMD_CONV_KML"; # convert NMEA to KML
# MAIN LOOP:Record gps data until script lifespan ends
+ timeBufferFirstNS="$(timeEpochNS)"; bufferRound=0
while [[ "$SECONDS" -lt "$SCRIPT_TTL" ]]; do
- magicParseRecipientDir
+ magicParseRecipientDir;
magicGatherWriteBuffer &
- sleep "$BUFFER_TTL";
+ magicBufferSleepPID; # Calculates BUFFER_TTL_ADJ from BUFFER_TTL given buffer expected start time vs. actual
+ sleep "$BUFFER_TTL_ADJ_FLOAT";
+ ((bufferRound++));
done
# Cleanup
projects / EVA-2020-02.git / commitdiff