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Last active May 12, 2023 14:21
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Dashing Cloudwatch

This is an adjusted version of EC2 CloudWatch stats for Dashing which is not bound to EC2 metrics but a generic widget for cloudwatch graphs. Visualization is done by Rickshawgraph as in the original example.

# lib/cloudwatch.rb
require 'aws-sdk'
require 'time'
class Cloudwatch
def initialize(options)
@access_key_id = options[:access_key_id]
@secret_access_key = options[:secret_access_key]
@region = options[:region]
@clientCache = {}
end
def get_metric_data(namespace, dimensions, metric_name, type=:average, options={})
if type == :average
statName = "Average"
elsif type == :sum
statName = "Sum"
elsif type == :maximum
statName = "Maxmimum"
end
statKey = type
# Get an API client instance
cw = @clientCache[@region]
if not cw
cw = @clientCache[@region] = AWS::CloudWatch::Client.new({
region: @region,
access_key_id: @access_key_id,
secret_access_key: @secret_access_key
})
end
# Build a default set of options to pass to get_metric_statistics
duration = (options[:duration] or (60*60*8))
start_time = (options[:start_time] or (Time.now - duration))
end_time = (options[:end_time] or (Time.now))
get_metric_statistics_options = {
namespace: namespace ,
metric_name: metric_name,
statistics: [statName],
start_time: start_time.utc.iso8601,
end_time: end_time.utc.iso8601,
period: (options[:period] or (60 * 5)), # Default to 5 min stats
dimensions: dimensions
}
# Go get stats
result = cw.get_metric_statistics(get_metric_statistics_options)
if ((not result[:datapoints]) or (result[:datapoints].length == 0))
# TODO: What kind of errors can I get back?
puts "\e[33mWarning: Got back no data for metric #{metric_name}\e[0m"
answer = nil
else
# Turn the result into a Rickshaw-style series
data = []
result[:datapoints].each do |datapoint|
point = {
x: (datapoint[:timestamp].to_i), # time in seconds since epoch
y: datapoint[statKey]
}
data.push point
end
data.sort! { |a,b| a[:x] <=> b[:x] }
answer = {
name: metric_name,
data: data
}
end
return answer
end
end
# jobs/some_job.rb
require './lib/cloudwatch'
cw = Cloudwatch.new({
:access_key_id => "xxx",
:secret_access_key => "xxx",
:region => 'eu-west-1'
})
SCHEDULER.every '1m', :first_in => 0 do |job|
series = []
%w(NumberOfNotificationsDelivered NumberOfNotificationsFailed).each do |metric|
series.push(
cw.get_metric_data(
'AWS/SNS',
[{:name => 'TopicName', :value => 'sometopic'}],
metric,
:sum,
{}
)
)
end
send_event "series", { series: series }
end
@trullock
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trullock commented Dec 8, 2014

some usage examples of this would be excellent :)

@sean-kang
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In line #27, AWS needs to be replaced with Aws.

@gl-lamhnguyen
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Can someone help me with the instruction to create BillingAlarm Cloudwatch with this?

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