platform

#!/bin/zsh
#
# Platform utilities for zsh scripts.
#

autoload -U colors && colors

# Returns 0 (success) if Darwin. Otherwise 1 (failure)
function is_darwin() {
    macos="Darwin"
    platform=`uname -a`
    if test "${platform#*$macos}" != "$platform"; then
        return 0 # success
    else
        return 1 # failure
    fi
}

function log_error() {
    msg=$1
    echo "$fg[red]ERROR:$reset_color $msg"
}

function log_warning() {
    msg=$1
    echo "$fg[yellow]WARNING:$reset_color $msg"
}

# Stop a service or group of services
#
# Please note that some some services (async services such as nodestatus) require
# two SIGINTs to be sent. The first closes the server, the next raise the SystemExit
# exception. This is why `kill` may be called more than once.
# More info @
# https://grpclib.readthedocs.io/en/latest/server.html#grpclib.utils.graceful_exit
function stop_service {
    service_name=$1
    services=`ps aux | grep "$service_name" | grep -v 'grep' | grep -v 'vim' | grep -v 'restart'`
    for s (${(f)services}); do
        sname=`echo $s | awk '{print $12}'`
        spid=`echo $s | awk '{print $2}'`
        echo "Stopping: $sname ($spid)"
        while true; do
            kill $spid
            # Give process time to die
            sleep 0.5
            # `-0` is a special signal that simply checks if signal exists
            kill -0 $spid 2> /dev/null
            # Will return value > 0 if process doesn't exist
            killed=$?
            if [ $killed -ne 0 ]; then
                break
            fi
        done
    done
}

function start_service {
    service_name=$1
    param=$2
    echo "Starting: $service_name"
    python3 $service_name $param >> /dev/null 2>&1 &
}