Wrapper script for denominator to prevent overrunning API limits. It works by watching the output file, and every 3 zones that are saved, it will pause for 4 seconds (so at most 45 zones/minute are retrieved).

denominator-zone-list.sh

#!/usr/bin/env bash
#
# Quinn Comendant <quinn@strangecode.com>
# 23 Sep 2016 19:31:05


#
# Functions
#

function usage() {
    echo "Usage: $(basename $0) FILENAME

Wrapper for \`denominator zone list\` to save all configured zones to the specified file. It will pause denominator for 25 seconds every 20 zones saved. This is required to avoid API limit violations. See https://github.com/Netflix/denominator/issues/376
";
    exit 1;
}


#
# Main
#

# Display help if run with invalid arguments.
[[ $# == 0 ]] && usage && exit 0;
[[ $# != 1 ]] && echo "Invalid arguments. Run with no args for help." && exit 1;

OUTFILE="$1";

if [[ -e "$OUTFILE" ]]; then
    echo "Not going to overwrite existing file: $OUTFILE";
    exit 1;
fi

if [[ -n "$(pidof java)" ]]; then
    echo "Another java program appears to be running (PID $(pidof java)). Is denominator already running?"
    exit 0;
fi

EVERY=3; # every number of zones saved
PAUSEFOR=4; # seconds

denominator zone list > "$OUTFILE" & sleep 2; DPID=$(pidof java); echo "I will pause PID '$DPID' for $PAUSEFOR sec every $EVERY zones"; while kill -0 $DPID 2>/dev/null; do if [[ -s "$OUTFILE" && $(($(wc -l < "$OUTFILE") % $EVERY)) -eq 0 ]]; then kill -STOP $DPID; sleep $PAUSEFOR; kill -CONT $DPID; fi; done

exit 0;