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#!/usr/bin/env ruby

###############
#
# Checks redis replication status.
# Can be used with master or slave.
#
# Copyright C. Flores github@petalphile.com
# Released under the MIT License:
# no warranty but you should feel free to
# do whatever you want with it.
#
###############

require 'optparse'
 
options = {}

optparse = OptionParser.new do|opts|
opts.banner = "Checks redis replication status. Usage: #{$0} -r <master|slave> <options>"
 
options[:host] = "localhost"
opts.on( '-h', '--host <host>', 'connect to redis running on <host>. defaults to localhost' ) do |host|
options[:host] = host.to_s
end
options[:port] = 6379
opts.on( '-p', '--port <port>', 'connect to redis running on <port>. defaults to 6379' ) do |port|
options[:port] = port.to_i
end
options[:role] = nil
opts.on( '-r', '--role <master|slave>', 'redis should be master or slave' ) do |role|
options[:role] = role.to_s
end
options[:connected_slaves] = nil
opts.on( '-c', '--connected_slaves <int>', 'master should have <int> slaves. must be used with -r/--role master. defaults to 1' ) do |int|
options[:connected_slaves] = int.to_i
end
options[:slave_lag] = nil
opts.on( '-l', '--replication_lag <int>', 'master io cannot be more than <int> seconds behind. used with -r/--role slave. default is 0' ) do |int|
options[:slave_lag] = int.to_i
end
opts.on( '--help', 'Display this screen' ) do
puts opts
exit
end
end
 
begin
optparse.parse!
if options[:role] == "slave"
if options[:connected_slaves]
puts "Error: -c/--connected_slaves cannot be used with -r/--role slave."
puts optparse
exit 2
end
elsif options[:role] == "master"
if options[:slave_lag]
puts "Error: -l/--slave_lag cannot be used with -r/--role master."
puts optparse
exit 2
end
else
puts "Error: must set -r/--role"
puts optparse
exit 2
end
rescue OptionParser::InvalidOption
puts "Error: unknown option"
puts optparse
exit 2
end

# the actual check

redis_info = `redis-cli -h #{options[:host]} -p #{options[:port]} info`

if $? != 0
puts "status err could not connect to redis on #{options[:host]}:#{options[:port]}"
exit 1
end

status = Hash.new
redis_info.each do |line|
key,value = line.chomp.split(':')
status[key] = value
end

if options[:role] == "slave"
expectedlag = options[:slave_lag].to_i || 0
if status["role"] =~ /slave/ \
&& status["master_link_status"] =~ /up/ \
&& status["master_last_io_seconds_ago"].to_i <= expectedlag

puts "status ok redis thinks it is slave"
else
puts "status err redis thinks it is #{status["role"]}, master is #{status["master_link_status"]} and last io was #{status["master_last_io_seconds_ago"]}s."
end
puts "metric master_last_io_seconds_ago int #{status["master_last_io_seconds_ago"]}"
else
expectedslaves = options[:connected_slaves] || 1
actualslaves = status["connected_slaves"].to_i
if status["role"] =~ /master/ && actualslaves == expectedslaves

puts "status ok redis is master with #{actualslaves} slaves."
else
puts "status err redis thinks it is #{status["role"]} with #{actualslaves} slaves."
end
puts "metric connected_slaves int #{actualslaves}"
end
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