diff -r 5b37998e522e -r 162c1de6545a web/lib/Zend/Service/Amazon/Ec2/CloudWatch.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/web/lib/Zend/Service/Amazon/Ec2/CloudWatch.php	Fri Mar 11 15:05:35 2011 +0100
@@ -0,0 +1,357 @@
+<?php
+/**
+ * Zend Framework
+ *
+ * LICENSE
+ *
+ * This source file is subject to the new BSD license that is bundled
+ * with this package in the file LICENSE.txt.
+ * It is also available through the world-wide-web at this URL:
+ * http://framework.zend.com/license/new-bsd
+ * If you did not receive a copy of the license and are unable to
+ * obtain it through the world-wide-web, please send an email
+ * to license@zend.com so we can send you a copy immediately.
+ *
+ * @category   Zend
+ * @package    Zend_Service_Amazon
+ * @subpackage Ec2
+ * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ * @version    $Id: CloudWatch.php 20096 2010-01-06 02:05:09Z bkarwin $
+ */
+
+/**
+ * @see Zend_Service_Amazon_Ec2_Abstract
+ */
+require_once 'Zend/Service/Amazon/Ec2/Abstract.php';
+
+/**
+ * An Amazon EC2 interface that allows yout to run, terminate, reboot and describe Amazon
+ * Ec2 Instances.
+ *
+ * @category   Zend
+ * @package    Zend_Service_Amazon
+ * @subpackage Ec2
+ * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ */
+class Zend_Service_Amazon_Ec2_CloudWatch extends Zend_Service_Amazon_Ec2_Abstract
+{
+    /**
+     * The HTTP query server
+     */
+    protected $_ec2Endpoint = 'monitoring.amazonaws.com';
+
+    /**
+     * The API version to use
+     */
+    protected $_ec2ApiVersion = '2009-05-15';
+
+    /**
+     * XML Namespace for the CloudWatch Stuff
+     */
+    protected $_xmlNamespace = 'http://monitoring.amazonaws.com/doc/2009-05-15/';
+
+    /**
+     * The following metrics are available from each EC2 instance.
+     *
+     * CPUUtilization: The percentage of allocated EC2 compute units that are
+     *  currently in use on the instance. This metric identifies the processing
+     *  power required to run an application upon a selected instance.
+     *
+     * NetworkIn: The number of bytes received on all network interfaces by
+     *  the instance. This metric identifies the volume of incoming network
+     *  traffic to an application on a single instance.
+     *
+     * NetworkOut: The number of bytes sent out on all network interfaces
+     *  by the instance. This metric identifies the volume of outgoing network
+     *  traffic to an application on a single instance.
+     *
+     * DiskWriteOps: Completed write operations to all hard disks available to
+     *  the instance. This metric identifies the rate at which an application
+     *  writes to a hard disk. This can be used to determine the speed in which
+     *  an application saves data to a hard disk.
+     *
+     * DiskReadBytes: Bytes read from all disks available to the instance. This
+     *  metric is used to determine the volume of the data the application reads
+     *  from the hard disk of the instance. This can be used to determine the
+     *  speed of the application for the customer.
+     *
+     * DiskReadOps: Completed read operations from all disks available to the
+     *  instances. This metric identifies the rate at which an application reads
+     *  a disk. This can be used to determine the speed in which an application
+     *  reads data from a hard disk.
+     *
+     * DiskWriteBytes: Bytes written to all disks available to the instance. This
+     *  metric is used to determine the volume of the data the application writes
+     *  onto the hard disk of the instance. This can be used to determine the speed
+     *  of the application for the customer.
+     *
+     * Latency: Time taken between a request and the corresponding response as seen
+     *  by the load balancer.
+     *
+     * RequestCount: The number of requests processed by the LoadBalancer.
+     *
+     * HealthyHostCount: The number of healthy instances. Both Load Balancing dimensions,
+     *  LoadBalancerName and AvailabilityZone, should be specified when retreiving
+     *  HealthyHostCount.
+     *
+     * UnHealthyHostCount: The number of unhealthy instances. Both Load Balancing dimensions,
+     *  LoadBalancerName and AvailabilityZone, should be specified when retreiving
+     *  UnHealthyHostCount.
+     *
+     * Amazon CloudWatch data for a new EC2 instance becomes available typically
+     * within one minute of the end of the first aggregation period for the new
+     * instance. You can use the currently available dimensions for EC2 instances
+     * along with these metrics in order to refine the slice of data you want returned,
+     * such as metric CPUUtilization and dimension ImageId to get all CPUUtilization
+     * data for instances using the specified AMI.
+     *
+     * @var array
+     */
+    protected $_validMetrics = array('CPUUtilization', 'NetworkIn', 'NetworkOut',
+                                    'DiskWriteOps', 'DiskReadBytes', 'DiskReadOps',
+                                    'DiskWriteBytes', 'Latency', 'RequestCount',
+                                    'HealthyHostCount', 'UnHealthyHostCount');
+
+    /**
+     * Amazon CloudWatch not only aggregates the raw data coming in, it also computes
+     * several statistics on the data. The following table lists the statistics that you can request:
+     *
+     * Minimum: The lowest value observed during the specified period. This can be used to
+     *  determine low volumes of activity for your application.
+     *
+     * Maximum: The highest value observed during the specified period. You can use this to
+     *  determine high volumes of activity for your application.
+     *
+     * Sum: The sum of all values received (if appropriate, for example a rate would not be
+     *  summed, but a number of items would be). This statistic is useful for determining
+     *  the total volume of a metric.
+     *
+     * Average: The Average of all values received during the specified period. By comparing
+     *  this statistic with the minimum and maximum statistics, you can determine the full
+     *  scope of a metric and how close the average use is to the minimum and the maximum.
+     *  This will allow you to increase or decrease your resources as needed.
+     *
+     * Samples: The count (number) of measures used. This statistic is always returned to
+     *  show the user the size of the dataset collected. This will allow the user to properly
+     *  weight the data.
+     *
+     * Statistics are computed within a period you specify, such as all CPUUtilization within a
+     * five minute period. At a minimum, all data is aggregated into one minute intervals. This
+     * is the minimum resolution of the data. It is this data that can be aggregated into larger
+     * periods of time that you request.
+     *
+     * Aggregate data is generally available from the service within one minute from the end of the
+     * aggregation period. Delays in data propagation might cause late or partially late data in
+     * some cases. If your data is delayed, you should check the service’s Health Dashboard for
+     * any current operational issues with either Amazon CloudWatch or the services collecting
+     * the data, such as EC2 or Elastic Load Balancing.
+     *
+     * @var array
+     */
+    protected $_validStatistics = array('Average', 'Maximum', 'Minimum', 'Samples', 'Sum');
+
+    /**
+     * Valid Dimention Keys for getMetricStatistics
+     *
+     * ImageId: This dimension filters the data you request for all instances running
+     *  this EC2 Amazon Machine Image (AMI).
+     *
+     * AvailabilityZone: This dimension filters the data you request for all instances
+     *  running in that EC2 Availability Zone.
+     *
+     * AutoScalingGroupName: This dimension filters the data you request for all instances
+     *  in a specified capacity group. An AutoScalingGroup is a collection of instances
+     *  defined by customers of the Auto Scaling service. This dimension is only available
+     *  for EC2 metrics when the instances are in such an AutoScalingGroup.
+     *
+     * InstanceId: This dimension filters the data you request for only the identified
+     *  instance. This allows a user to pinpoint an exact instance from which to monitor data.
+     *
+     * InstanceType: This dimension filters the data you request for all instances running
+     *  with this specified instance type. This allows a user to catagorize his data by the
+     *  type of instance running. For example, a user might compare data from an m1.small instance
+     *  and an m1.large instance to determine which has the better business value for his application.
+     *
+     * LoadBalancerName: This dimension filters the data you request for the specified LoadBalancer
+     *  name. A LoadBalancer is represented by a DNS name and provides the single destination to
+     *  which all requests intended for your application should be directed. This metric allows
+     *  you to examine data from all instances connected to a single LoadBalancer.
+     *
+     * @var array
+     */
+    protected $_validDimensionsKeys = array('ImageId', 'AvailabilityZone', 'AutoScalingGroupName',
+                                            'InstanceId', 'InstanceType', 'LoadBalancerName');
+
+    /**
+     * Returns data for one or more statistics of given a metric
+     *
+     * Note:
+     * The maximum number of datapoints that the Amazon CloudWatch service will
+     * return in a single GetMetricStatistics request is 1,440. If a request is
+     * made that would generate more datapoints than this amount, Amazon CloudWatch
+     * will return an error. You can alter your request by narrowing the time range
+     * (StartTime, EndTime) or increasing the Period in your single request. You may
+     * also get all of the data at the granularity you originally asked for by making
+     * multiple requests with adjacent time ranges.
+     *
+     * @param array $options            The options you want to get statistics for:
+     *                                  ** Required **
+     *                                  MeasureName: The measure name that corresponds to
+     *                                      the measure for the gathered metric. Valid EC2 Values are
+     *                                      CPUUtilization, NetworkIn, NetworkOut, DiskWriteOps
+     *                                      DiskReadBytes, DiskReadOps, DiskWriteBytes. Valid Elastic
+     *                                      Load Balancing Metrics are Latency, RequestCount, HealthyHostCount
+     *                                      UnHealthyHostCount
+     *                                  Statistics: The statistics to be returned for the given metric. Valid
+     *                                      values are Average, Maximum, Minimum, Samples, Sum.  You can specify
+     *                                      this as a string or as an array of values.  If you don't specify one
+     *                                      it will default to Average instead of failing out.  If you specify an incorrect
+     *                                      option it will just skip it.
+     *                                  ** Optional **
+     *                                  Dimensions: Amazon CloudWatch allows you to specify one Dimension to further filter
+     *                                      metric data on. If you don't specify a dimension, the service returns the aggregate
+     *                                      of all the measures with the given measure name and time range.
+     *                                  Unit: The standard unit of Measurement for a given Measure. Valid Values: Seconds,
+     *                                      Percent, Bytes, Bits, Count, Bytes/Second, Bits/Second, Count/Second, and None
+     *                                      Constraints: When using count/second as the unit, you should use Sum as the statistic
+     *                                      instead of Average. Otherwise, the sample returns as equal to the number of requests
+     *                                      instead of the number of 60-second intervals. This will cause the Average to
+     *                                      always equals one when the unit is count/second.
+     *                                  StartTime: The timestamp of the first datapoint to return, inclusive. For example,
+     *                                      2008-02-26T19:00:00+00:00. We round your value down to the nearest minute.
+     *                                      You can set your start time for more than two weeks in the past. However,
+     *                                      you will only get data for the past two weeks. (in ISO 8601 format)
+     *                                      Constraints: Must be before EndTime
+     *                                  EndTime: The timestamp to use for determining the last datapoint to return. This is
+     *                                      the last datapoint to fetch, exclusive. For example, 2008-02-26T20:00:00+00:00.
+     *                                      (in ISO 8601 format)
+     */
+    public function getMetricStatistics(array $options)
+    {
+        $_usedStatistics = array();
+
+        $params = array();
+        $params['Action'] = 'GetMetricStatistics';
+
+        if (!isset($options['Period'])) {
+            $options['Period'] = 60;
+        }
+        if (!isset($options['Namespace'])) {
+            $options['Namespace'] = 'AWS/EC2';
+        }
+
+        if (!isset($options['MeasureName']) || !in_array($options['MeasureName'], $this->_validMetrics, true)) {
+            throw new Zend_Service_Amazon_Ec2_Exception('Invalid Metric Type: ' . $options['MeasureName']);
+        }
+
+        if(!isset($options['Statistics'])) {
+            $options['Statistics'][] = 'Average';
+        } elseif(!is_array($options['Statistics'])) {
+            $options['Statistics'][] = $options['Statistics'];
+        }
+
+        foreach($options['Statistics'] as $k=>$s) {
+            if(!in_array($s, $this->_validStatistics, true)) continue;
+            $options['Statistics.member.' . ($k+1)] = $s;
+            $_usedStatistics[] = $s;
+        }
+        unset($options['Statistics']);
+
+        if(isset($options['StartTime'])) {
+            if(!is_numeric($options['StartTime'])) $options['StartTime'] = strtotime($options['StartTime']);
+            $options['StartTime'] = gmdate('c', $options['StartTime']);
+        } else {
+            $options['StartTime'] = gmdate('c', strtotime('-1 hour'));
+        }
+
+        if(isset($options['EndTime'])) {
+            if(!is_numeric($options['EndTime'])) $options['EndTime'] = strtotime($options['EndTime']);
+            $options['EndTime'] = gmdate('c', $options['EndTime']);
+        } else {
+            $options['EndTime'] = gmdate('c');
+        }
+
+        if(isset($options['Dimensions'])) {
+            $x = 1;
+            foreach($options['Dimensions'] as $dimKey=>$dimVal) {
+                if(!in_array($dimKey, $this->_validDimensionsKeys, true)) continue;
+                $options['Dimensions.member.' . $x . '.Name'] = $dimKey;
+                $options['Dimensions.member.' . $x . '.Value'] = $dimVal;
+                $x++;
+            }
+            
+            unset($options['Dimensions']);
+        }
+
+        $params = array_merge($params, $options);
+
+        $response = $this->sendRequest($params);
+        $response->setNamespace($this->_xmlNamespace);
+
+        $xpath = $response->getXPath();
+        $nodes = $xpath->query('//ec2:GetMetricStatisticsResult/ec2:Datapoints/ec2:member');
+
+        $return = array();
+        $return['label'] = $xpath->evaluate('string(//ec2:GetMetricStatisticsResult/ec2:Label/text())');
+        foreach ( $nodes as $node ) {
+            $item = array();
+
+            $item['Timestamp'] = $xpath->evaluate('string(ec2:Timestamp/text())', $node);
+            $item['Unit'] = $xpath->evaluate('string(ec2:Unit/text())', $node);
+            $item['Samples'] = $xpath->evaluate('string(ec2:Samples/text())', $node);
+            foreach($_usedStatistics as $us) {
+                $item[$us] = $xpath->evaluate('string(ec2:' . $us . '/text())', $node);
+            }
+
+            $return['datapoints'][] = $item;
+            unset($item, $node);
+        }
+
+        return $return;
+
+    }
+
+    /**
+     * Return the Metrics that are aviable for your current monitored instances
+     *
+     * @param string $nextToken     The NextToken parameter is an optional parameter
+     *                                 that allows you to retrieve the next set of results
+     *                                 for your ListMetrics query.
+     * @return array
+     */
+    public function listMetrics($nextToken = null)
+    {
+        $params = array();
+        $params['Action'] = 'ListMetrics';
+        if (!empty($nextToken)) {
+            $params['NextToken'] = $nextToken;
+        }
+
+        $response = $this->sendRequest($params);
+        $response->setNamespace($this->_xmlNamespace);
+
+        $xpath = $response->getXPath();
+        $nodes = $xpath->query('//ec2:ListMetricsResult/ec2:Metrics/ec2:member');
+
+        $return = array();
+        foreach ( $nodes as $node ) {
+            $item = array();
+
+            $item['MeasureName'] = $xpath->evaluate('string(ec2:MeasureName/text())', $node);
+            $item['Namespace'] = $xpath->evaluate('string(ec2:Namespace/text())', $node);
+            $item['Deminsions']['name'] = $xpath->evaluate('string(ec2:Dimensions/ec2:member/ec2:Name/text())', $node);
+            $item['Deminsions']['value'] = $xpath->evaluate('string(ec2:Dimensions/ec2:member/ec2:Value/text())', $node);
+
+            if (empty($item['Deminsions']['name'])) {
+                $item['Deminsions'] = array();
+            }
+
+            $return[] = $item;
+            unset($item, $node);
+        }
+
+        return $return;
+    }
+}