feat(unitproc/bkshuf):Exit early if stdout not being read

[BK-2020-03.git] / unitproc / bkFreqWrite

diff --git a/unitproc/bkFreqWrite b/unitproc/bkFreqWrite
index a4ce1d88251c23ee3b139969254e524331951915..e608ba44b3d5a01e94d68eb0acff43942ef145ec 100644 (file)
--- a/unitproc/bkFreqWrite
+++ b/unitproc/bkFreqWrite
@@ -1,22 +1,37 @@
 #!/bin/bash
-# Desc: Writes stdin to disk every 5 minutes
-
-yell() { echo "[$(date --iso-8601=ns)]:$0: $*" >&2; }      #o Yell, Die, Try Three-Fingered Claw technique
+# Desc: Writes stdin to disk every 5 seconds
+yell() { echo "$0: $*" >&2; }      #o Yell, Die, Try Three-Fingered Claw technique
 die() { yell "$*"; exit 111; }     #o Ref/Attrib: https://stackoverflow.com/a/25515370
 try() { "$@" || die "cannot $*"; } #o
+declare -a buffer # Initialize buffer array
+scriptTTL="15";
+bufferTTL="5";
+magicWriteBuffer() {
+    printf "%s\n" "${buffer[@]}" | cat | cat | cat >> /dev/shm/$(date +%s)..bkFreqWrite-output1.txt;
+    printf "%s\n" "${buffer[@]}" | cat | cat | cat >> /dev/shm/$(date +%s)..bkFreqWrite-output2.txt;
+    printf "%s\n" "${buffer[@]}" | cat | cat | cat >> /dev/shm/$(date +%s)..bkFreqWrite-output3.txt;
+}
 
-declare -a buffer
-
-yell "Script started."
-
-mapfile -s4 -n5 buffer
-
-yell "Contents of buffer:${buffer[@]}";
-
-for element in "${buffer[@]}"; do
-    echo "$element";
-    sleep 1;
+bufferRound=0;
+# Run until script TTL seconds pass
+while [[ $SECONDS -lt "scriptTTL" ]]; do
+    bufferTOD="$((SECONDS + $bufferTTL))";
+    lineCount=0;
+    # Consume stdin to fill buffer until buffer time-of-death (TOD) arrives
+    while read -r -t "$bufferTTL" line && [[ $SECONDS -lt "$bufferTOD" ]]; do
+       # Append line to buffer array
+       buffer+=("$line");
+       echo "DEBUG:Processing line:$lineCount";
+       echo "DEBUG:Current line   :$line";
+       echo "DEBUG:buf elem count :${#buffer[@]}";
+       ((lineCount++));
+    done;
+    # Export buffer to asynchronous processing.
+    magicWriteBuffer &
+    unset buffer; # Clear buffer array for next bufferRound
+    # Increment buffer round
+    ((bufferRound++));
 done;
 
-yell "Script completed."
-exit 0;
+# Author: Steven Baltakatei Sandoval
+# License: GPLv3+