Merge branch 'master' of gogs.informatik.hs-fulda.de:srieger/cloud-computing-msc-ai-examples

# Conflicts:
#	aws-cloudformation-demo/cloudcomp-counter-demo-with-vpc-designer.png
#	aws-cloudformation-demo/cloudcomp-counter-demo-with-vpc.json
#	aws-cloudformation-demo/cloudcomp-counter-demo.json
#	aws-turnserver/stop.py
#	example-projects/counter-demo/aws-cloudformation-demo/cloudcomp-counter-demo-with-vpc-designer.png
#	example-projects/counter-demo/aws-cloudformation-demo/cloudcomp-counter-demo-with-vpc.json
#	example-projects/counter-demo/aws-cloudformation-demo/cloudcomp-counter-demo.json
#	example-projects/counter-demo/aws-cloudformation/cloudcomp-counter-demo-with-vpc-designer.png
#	example-projects/counter-demo/aws-cloudformation/cloudcomp-counter-demo-with-vpc.json
#	example-projects/counter-demo/aws-cloudformation/cloudcomp-counter-demo.json
#	example-projects/tug-of-war-in-the-clouds/stop.py
#	example-projects/turnserver/aws-boto3/start.py
#	example-projects/turnserver/aws-boto3/stop.py

.idea/cloud-computing-msc-ai-examples.iml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="PYTHON_MODULE" version="4">
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$" />
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+  <component name="TestRunnerService">
+    <option name="PROJECT_TEST_RUNNER" value="Unittests" />
+  </component>
+</module>

.idea/misc.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="JavaScriptSettings">
+    <option name="languageLevel" value="ES6" />
+  </component>
+  <component name="ProjectRootManager" version="2" project-jdk-name="Python 3.6" project-jdk-type="Python SDK" />
+</project>

.idea/modules.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/cloud-computing-msc-ai-examples.iml" filepath="$PROJECT_DIR$/.idea/cloud-computing-msc-ai-examples.iml" />
+    </modules>
+  </component>
+</project>

.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>

example-projects/tug-of-war-in-the-clouds/aws-boto3-rds-db/start.py

@@ -0,0 +1,206 @@
+import boto3
+from botocore.exceptions import ClientError
+
+region = 'eu-central-1'
+availabilityZone = 'eu-central-1b'
+imageId = 'ami-0cc293023f983ed53'
+instanceType = 't3.nano'
+keyName = 'srieger-pub'
+#userDataDB = ('#!/bin/bash\n'
+#              '#!/bin/bash\n'
+#              '# extra repo for RedHat rpms\n'
+#              'yum install -y https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm\n'
+#              '# essential tools\n'
+#              'yum install -y joe htop git\n'
+#              '# mysql\n'
+#              'yum install -y mariadb mariadb-server\n'
+#              '\n'
+#              'service mariadb start\n'
+#              '\n'
+#              'echo "create database cloud_tug_of_war" | mysql -u root\n'
+#              '\n'
+#              'echo "create table clouds ( cloud_id INT AUTO_INCREMENT, name VARCHAR(255) NOT NULL, value INT, max_value INT, PRIMARY KEY (cloud_id))" | mysql -u root cloud_tug_of_war\n'
+#              '\n'
+#              'echo "CREATE USER \'cloud_tug_of_war\'@\'%\' IDENTIFIED BY \'cloud\';" | mysql -u root\n'
+#              'echo "GRANT ALL PRIVILEGES ON cloud_tug_of_war.* TO \'cloud_tug_of_war\'@\'%\';" | mysql -u root\n'
+#              'echo "FLUSH PRIVILEGES" | mysql -u root\n'
+#              )
+
+# convert with: cat install-mysql | sed "s/^/'/; s/$/\\\n'/"
+
+client = boto3.setup_default_session(region_name=region)
+ec2Client = boto3.client("ec2")
+ec2Resource = boto3.resource('ec2')
+
+rdsClient = boto3.client("rds")
+
+response = ec2Client.describe_vpcs()
+vpc_id = response.get('Vpcs', [{}])[0].get('VpcId', '')
+subnet_id = ec2Client.describe_subnets(
+    Filters=[
+        {
+            'Name': 'availability-zone', 'Values': [availabilityZone]
+        }
+    ])['Subnets'][0]['SubnetId']
+
+print("Deleting old instance...")
+print("------------------------------------")
+
+response = ec2Client.describe_instances(Filters=[{'Name': 'tag-key', 'Values': ['tug-of-war']}])
+print(response)
+reservations = response['Reservations']
+for reservation in reservations:
+    for instance in reservation['Instances']:
+        if instance['State']['Name'] == "running" or instance['State']['Name'] == "pending":
+            response = ec2Client.terminate_instances(InstanceIds=[instance['InstanceId']])
+            print(response)
+            instanceToTerminate = ec2Resource.Instance(instance['InstanceId'])
+            instanceToTerminate.wait_until_terminated()
+
+print("Deleting old DB instance...")
+print("------------------------------------")
+
+try:
+    response = rdsClient.delete_db_instance(
+        DBInstanceIdentifier='tug-of-war-db1',
+        SkipFinalSnapshot=True,
+        DeleteAutomatedBackups=True
+    )
+except ClientError as e:
+    print(e)
+
+waiter = rdsClient.get_waiter('db_instance_deleted')
+waiter.wait(DBInstanceIdentifier='tug-of-war-db1')
+
+
+
+print("Delete old security group...")
+print("------------------------------------")
+
+try:
+    response = ec2Client.delete_security_group(GroupName='tug-of-war')
+except ClientError as e:
+    print(e)
+
+print("Create security group...")
+print("------------------------------------")
+
+try:
+    response = ec2Client.create_security_group(GroupName='tug-of-war',
+                                               Description='tug-of-war',
+                                               VpcId=vpc_id)
+    security_group_id = response['GroupId']
+    print('Security Group Created %s in vpc %s.' % (security_group_id, vpc_id))
+
+    data = ec2Client.authorize_security_group_ingress(
+        GroupId=security_group_id,
+        IpPermissions=[
+            {'IpProtocol': 'tcp',
+             'FromPort': 3306,
+             'ToPort': 3306,
+             'IpRanges': [{'CidrIp': '0.0.0.0/0'}]},
+            {'IpProtocol': 'tcp',
+             'FromPort': 22,
+             'ToPort': 22,
+             'IpRanges': [{'CidrIp': '0.0.0.0/0'}]},
+            {'IpProtocol': 'tcp',
+             'FromPort': 80,
+             'ToPort': 80,
+             'IpRanges': [{'CidrIp': '0.0.0.0/0'}]},
+            {'IpProtocol': 'tcp',
+             'FromPort': 443,
+             'ToPort': 443,
+             'IpRanges': [{'CidrIp': '0.0.0.0/0'}]}
+        ])
+    print('Ingress Successfully Set %s' % data)
+except ClientError as e:
+    print(e)
+
+print("Running new DB instance...")
+print("------------------------------------")
+
+response = rdsClient.create_db_instance(DBInstanceIdentifier="tug-of-war-db1",
+    AllocatedStorage=20,
+    DBName='tug_of_war',
+    # Engine='mariadb',
+    Engine='mysql',
+    # General purpose SSD
+    StorageType='gp2',
+    #StorageEncrypted=True,
+    AutoMinorVersionUpgrade=True,
+    # Set this to true later?
+    MultiAZ=False,
+    MasterUsername='cloud_tug_of_war',
+    MasterUserPassword='cloudcloud',
+    VpcSecurityGroupIds=[security_group_id],
+    #DBInstanceClass='db.m3.2xlarge',
+    DBInstanceClass='db.t3.micro',
+    Tags=[
+        {'Key': 'Name', 'Value': 'tug-of-war-db1'},
+        {'Key': 'tug-of-war', 'Value': 'db'}
+    ],
+)
+
+waiter = rdsClient.get_waiter('db_instance_available')
+waiter.wait(DBInstanceIdentifier='tug-of-war-db1')
+
+#dbArn = response['DBInstance'][0]['DBInstanceArn']
+dbEndpointAddress = response['DBInstance'][0]['Endpoint']['Address']
+dbEndpointPort = response['DBInstance'][0]['Endpoint']['Port']
+
+print(dbEndpointAddress + ":" + dbEndpointPort)
+
+userDataWebServer = ('#!/bin/bash\n'
+                     '# extra repo for RedHat rpms\n'
+                     'yum install -y https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm\n'
+                     '# essential tools\n'
+                     'yum install -y joe htop git\n'
+                     '# mysql\n'
+                     'yum install -y httpd php php-mysql\n'
+                     '\n'
+                     'service httpd start\n'
+                     '\n'
+                     'wget http://mmnet.informatik.hs-fulda.de/cloudcomp/tug-of-war-in-the-clouds.tar.gz\n'
+                     'cp tug-of-war-in-the-clouds.tar.gz /var/www/html/\n'
+                     'cd /var/www/html\n'
+                     'tar zxvf tug-of-war-in-the-clouds.tar.gz\n'
+                     '\n'
+                     '# change hostname of db connection\n'
+                     'sed -i s/localhost/' + dbEndpointAddress + '/g /var/www/html/config.php\n'
+                     'sed -i s/\\\'cloud\\\'/cloudcloud/g /var/www/html/config.php\n'
+                     )
+
+for i in range(1, 2):
+    print("Running new Web Server instance...")
+    print("------------------------------------")
+
+    response = ec2Client.run_instances(
+        ImageId=imageId,
+        InstanceType=instanceType,
+        Placement={'AvailabilityZone': availabilityZone, },
+        KeyName=keyName,
+        MinCount=1,
+        MaxCount=1,
+        UserData=userDataWebServer,
+        SecurityGroupIds=[
+            security_group_id,
+        ],
+
+        TagSpecifications=[
+            {
+                'ResourceType': 'instance',
+                'Tags': [
+                    {'Key': 'Name', 'Value': 'tug-of-war-webserver' + i},
+                    {'Key': 'tug-of-war', 'Value': 'webserver'}
+                ],
+            }
+        ],
+    )
+
+    instanceIdWeb = response['Instances'][0]['InstanceId']
+
+    instance = ec2Resource.Instance(instanceIdWeb)
+    instance.wait_until_running()
+    instance.load()
+
+    print("tug-of-war-in-the-clouds can be accessed at: " + instance.public_ip_address)

example-projects/tug-of-war-in-the-clouds/aws-boto3-rds-db/stop.py

@@ -0,0 +1,57 @@
+import time
+import boto3
+from botocore.exceptions import ClientError
+
+region = 'eu-central-1'
+
+client = boto3.setup_default_session(region_name=region)
+ec2Client = boto3.client("ec2")
+ec2Resource = boto3.resource('ec2')
+
+response = ec2Client.describe_vpcs()
+vpc_id = response.get('Vpcs', [{}])[0].get('VpcId', '')
+
+elbv2Client = boto3.client('elbv2')
+
+print("Deleting load balancer and deps...")
+print("------------------------------------")
+
+try:
+    response = elbv2Client.describe_load_balancers(Names=['tug-of-war-loadbalancer'])
+    loadbalancer_arn = response.get('LoadBalancers', [{}])[0].get('LoadBalancerArn', '')
+    response = elbv2Client.delete_load_balancer(LoadBalancerArn=loadbalancer_arn)
+except ClientError as e:
+    print(e)
+
+time.sleep(5)
+
+try:
+    response = elbv2Client.describe_target_groups(Names=['tug-of-war-targetgroup'])
+    targetgroup_arn = response.get('TargetGroups', [{}])[0].get('TargetGroupArn', '')
+    response = elbv2Client.delete_target_group(TargetGroupArn=targetgroup_arn)
+except ClientError as e:
+    print(e)
+
+
+
+print("Deleting old instance...")
+print("------------------------------------")
+
+response = ec2Client.describe_instances(Filters=[{'Name': 'tag-key', 'Values': ['tug-of-war']}])
+print(response)
+reservations = response['Reservations']
+for reservation in reservations:
+    for instance in reservation['Instances']:
+        if instance['State']['Name'] == "running" or instance['State']['Name'] == "pending":
+            response = ec2Client.terminate_instances(InstanceIds=[instance['InstanceId']])
+            print(response)
+            instanceToTerminate = ec2Resource.Instance(instance['InstanceId'])
+            instanceToTerminate.wait_until_terminated()
+
+print("Delete old security group...")
+print("------------------------------------")
+
+try:
+    response = ec2Client.delete_security_group(GroupName='tug-of-war')
+except ClientError as e:
+    print(e)

example-projects/tug-of-war-in-the-clouds/aws-boto3-standalone-db/create-loadbalancer.py

@@ -0,0 +1,86 @@
+import boto3
+from botocore.exceptions import ClientError
+
+region = 'eu-central-1'
+availabilityZone = 'eu-central-1b'
+subnet1 = 'subnet-41422b28'
+subnet2 = 'subnet-5c5f6d16'
+subnet3 = 'subnet-6f2ea214'
+
+client = boto3.setup_default_session(region_name=region)
+ec2Client = boto3.client("ec2")
+ec2Resource = boto3.resource('ec2')
+
+response = ec2Client.describe_vpcs()
+vpc_id = response.get('Vpcs', [{}])[0].get('VpcId', '')
+
+response = ec2Client.describe_security_groups(Filters=[{'Name': 'group-name', 'Values': ['tug-of-war']}])
+security_group_id = response.get('SecurityGroups', [{}])[0].get('GroupId', '')
+
+elbv2Client = boto3.client('elbv2')
+
+response = elbv2Client.create_load_balancer(
+    Name='tug-of-war-loadbalancer',
+    Subnets=[
+        subnet1,
+        subnet2,
+        subnet3,
+    ],
+    SecurityGroups=[
+        security_group_id
+    ]
+)
+
+loadbalancer_arn = response.get('LoadBalancers', [{}])[0].get('LoadBalancerArn', '')
+loadbalancer_dns = response.get('LoadBalancers', [{}])[0].get('DNSName', '')
+
+response = elbv2Client.create_target_group(
+    Name='tug-of-war-targetgroup',
+    Port=80,
+    Protocol='HTTP',
+    VpcId=vpc_id,
+)
+
+targetgroup_arn = response.get('TargetGroups', [{}])[0].get('TargetGroupArn', '')
+
+response = elbv2Client.create_listener(
+    DefaultActions=[
+        {
+            'TargetGroupArn': targetgroup_arn,
+            'Type': 'forward',
+        },
+    ],
+    LoadBalancerArn=loadbalancer_arn,
+    Port=80,
+    Protocol='HTTP',
+)
+
+response = elbv2Client.modify_target_group_attributes(
+    TargetGroupArn=targetgroup_arn,
+    Attributes=[
+        {
+            'Key': 'stickiness.enabled',
+            'Value': 'true'
+        },
+    ]
+)
+
+print("Registering instances...")
+print("------------------------------------")
+
+response = ec2Client.describe_instances(Filters=[{'Name': 'tag:tug-of-war', 'Values': ['webserver']}])
+print(response)
+reservations = response['Reservations']
+for reservation in reservations:
+    for instance in reservation['Instances']:
+        if instance['State']['Name'] == "running" or instance['State']['Name'] == "pending":
+            response = elbv2Client.register_targets(
+                TargetGroupArn=targetgroup_arn,
+                Targets=[
+                    {
+                        'Id': instance['InstanceId'],
+                    },
+                ],
+            )
+
+print('Load Balancer should be reachable at: ' + loadbalancer_dns)

example-projects/tug-of-war-in-the-clouds/aws-boto3-standalone-db/start-and-add-new-target.py

@@ -0,0 +1,70 @@
+import boto3
+from botocore.exceptions import ClientError
+
+region = 'eu-central-1'
+availabilityZone = 'eu-central-1b'
+subnet1 = 'subnet-41422b28'
+subnet2 = 'subnet-5c5f6d16'
+subnet3 = 'subnet-6f2ea214'
+
+client = boto3.setup_default_session(region_name=region)
+ec2Client = boto3.client("ec2")
+ec2Resource = boto3.resource('ec2')
+
+response = ec2Client.describe_vpcs()
+vpc_id = response.get('Vpcs', [{}])[0].get('VpcId', '')
+
+elbv2Client = boto3.client('elbv2')
+
+for i in range(3, 4):
+    print("Running new Web Server instance...")
+    print("------------------------------------")
+
+    response = ec2Client.run_instances(
+        ImageId=imageId,
+        InstanceType=instanceType,
+        Placement={'AvailabilityZone': availabilityZone, },
+        KeyName=keyName,
+        MinCount=1,
+        MaxCount=1,
+        UserData=userDataWebServer,
+        SecurityGroupIds=[
+            security_group_id,
+        ],
+
+        TagSpecifications=[
+            {
+                'ResourceType': 'instance',
+                'Tags': [
+                    {'Key': 'Name', 'Value': 'tug-of-war-webserver1'},
+                    {'Key': 'tug-of-war', 'Value': 'webserver'}
+                ],
+            }
+        ],
+    )
+
+    instanceIdWeb = response['Instances'][0]['InstanceId']
+
+    instance = ec2Resource.Instance(instanceIdWeb)
+    instance.wait_until_running()
+    instance.load()
+
+    print("tug-of-war-in-the-clouds can be accessed at: " + instance.public_ip_address)
+
+try:
+    response = elbv2Client.describe_target_groups(Names=['tug-of-war-targetgroup'])
+    targetgroup_arn = response.get('TargetGroups', [{}])[0].get('TargetGroupArn', '')
+except ClientError as e:
+    print(e)
+
+print("Registering instance...")
+print("------------------------------------")
+
+response = elbv2Client.register_targets(
+    TargetGroupArn=targetgroup_arn,
+    Targets=[
+        {
+            'Id': instanceIdWeb,
+        },
+    ],
+)

example-projects/tug-of-war-in-the-clouds/aws-boto3-standalone-db/start.py

@@ -116,7 +116,7 @@ response = ec2Client.run_instances(
             'ResourceType': 'instance',
             'Tags': [
                 {'Key': 'Name', 'Value': 'tug-of-war-db1'},
-                {'Key': 'tug-of-war', 'Value': 'installed'}
+                {'Key': 'tug-of-war', 'Value': 'db'}
             ],
         }
     ],
@@ -124,7 +124,7 @@ response = ec2Client.run_instances(
 
 instanceIdDB = response['Instances'][0]['InstanceId']
 privateIpDB = response['Instances'][0]['PrivateIpAddress']
-#privateIpDB = response['Instances'][0]['NetworkInterfaces'][0]['NetworkInterfaceId']
+# privateIpDB = response['Instances'][0]['NetworkInterfaces'][0]['NetworkInterfaceId']
 
 instance = ec2Resource.Instance(instanceIdDB)
 instance.wait_until_running()
@@ -150,10 +150,11 @@ userDataWebServer = ('#!/bin/bash\n'
                      'sed -i s/localhost/' + privateIpDB + '/g /var/www/html/config.php\n'
                      )
 
-print("Running new Web Server instance...")
-print("------------------------------------")
+for i in range(1, 3):
+    print("Running new Web Server instance...")
+    print("------------------------------------")
 
-response = ec2Client.run_instances(
+    response = ec2Client.run_instances(
         ImageId=imageId,
         InstanceType=instanceType,
         Placement={'AvailabilityZone': availabilityZone, },
@@ -169,16 +170,17 @@ response = ec2Client.run_instances(
             {
                 'ResourceType': 'instance',
                 'Tags': [
-                {'Key': 'Name', 'Value': 'tug-of-war-webserver1'},
-                {'Key': 'tug-of-war', 'Value': 'installed'}
+                    {'Key': 'Name', 'Value': 'tug-of-war-webserver' + i},
+                    {'Key': 'tug-of-war', 'Value': 'webserver'}
                 ],
             }
         ],
-)
+    )
 
-instanceIdDB = response['Instances'][0]['InstanceId']
-privateIpDB = response['Instances'][0]['PrivateIpAddress']
-#privateIpDB = response['Instances'][0]['NetworkInterfaces'][0]['NetworkInterfaceId']
+    instanceIdWeb = response['Instances'][0]['InstanceId']
 
-instance = ec2Resource.Instance(instanceIdDB)
-instance.wait_until_running()
+    instance = ec2Resource.Instance(instanceIdWeb)
+    instance.wait_until_running()
+    instance.load()
+
+    print("tug-of-war-in-the-clouds can be accessed at: " + instance.public_ip_address)

example-projects/tug-of-war-in-the-clouds/aws-boto3-standalone-db/stop.py

@@ -1,3 +1,4 @@
+import time
 import boto3
 from botocore.exceptions import ClientError
 
@@ -10,6 +11,29 @@ ec2Resource = boto3.resource('ec2')
 response = ec2Client.describe_vpcs()
 vpc_id = response.get('Vpcs', [{}])[0].get('VpcId', '')
 
+elbv2Client = boto3.client('elbv2')
+
+print("Deleting load balancer and deps...")
+print("------------------------------------")
+
+try:
+    response = elbv2Client.describe_load_balancers(Names=['tug-of-war-loadbalancer'])
+    loadbalancer_arn = response.get('LoadBalancers', [{}])[0].get('LoadBalancerArn', '')
+    response = elbv2Client.delete_load_balancer(LoadBalancerArn=loadbalancer_arn)
+except ClientError as e:
+    print(e)
+
+time.sleep(5)
+
+try:
+    response = elbv2Client.describe_target_groups(Names=['tug-of-war-targetgroup'])
+    targetgroup_arn = response.get('TargetGroups', [{}])[0].get('TargetGroupArn', '')
+    response = elbv2Client.delete_target_group(TargetGroupArn=targetgroup_arn)
+except ClientError as e:
+    print(e)
+
+
+
 print("Deleting old instance...")
 print("------------------------------------")
 

example-projects/tug-of-war-in-the-clouds/web-content/cloud.php

@@ -0,0 +1,101 @@
+<?php
+session_start();
+include 'config.php';
+?>
+<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
+<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
+<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
+
+<?php
+if (!isset($_SESSION["team"]))
+{
+   if (isset($_POST["team_minus"]))
+   {
+      print "You joined team minus (blue)...";
+      $_SESSION["team"]="minus";
+   }
+   elseif (isset($_POST["team_plus"]))
+   {
+      print "You joined team minus (green)...";
+      $_SESSION["team"]="plus";
+   }
+   else
+   {
+      print "<h1>Choose your team!</h1>";
+      ?>
+      <form action="" method="post">
+      <input type="submit" name="team_minus" value="Team Minus (Blue)">
+      <input type="submit" name="team_plus" value="Team Plus (Green)">
+      </form>
+      <?php
+   }
+}
+
+if (isset($_SESSION["team"]))
+{
+   ?>
+
+   <h1>Pull!!!</h1>
+   <p>
+   <?php
+   if (isset($_GET['cloud_id']))
+   {
+      $sql = "SELECT * FROM clouds WHERE cloud_id = " . $_GET['cloud_id'];
+      foreach ($pdo->query($sql) as $row)
+      {
+         if (abs(intval($row["value"])) >= intval($row["max_value"]))
+         {
+            unset($_SESSION["team"]);
+            $_SESSION["finished"] = true;
+         }
+      }
+
+      if (isset($_POST['pull']))
+      {
+         if ($_SESSION["team"] == "plus")
+         {
+            print "You pulled for team plus (green)...";
+            $sql = "UPDATE clouds SET value=value+1 WHERE cloud_id = " . $_GET['cloud_id'];
+            $result = $pdo->query($sql);
+         }
+         if ($_SESSION["team"] == "minus")
+         {
+            print "You pulled for team minus (blue)...";   
+            $sql = "UPDATE clouds SET value=value-1 WHERE cloud_id = " . $_GET['cloud_id'];
+            $result = $pdo->query($sql);
+         }
+      }
+
+      $sql = "SELECT * FROM clouds WHERE cloud_id = " . $_GET['cloud_id'];
+      foreach ($pdo->query($sql) as $row)
+      {
+         print "<h2>Value: " . $row["value"] . " (Goal: " . $row["max_value"] . ")</h2>";
+      }
+      
+      if (!isset($_SESSION["finished"]))
+      {
+         ?>
+         <form action="" method="post">
+            <input type="submit" name="pull" value="Pull">
+         </form>
+         <?php
+      }
+      else
+      {
+         print "<h2>game over</h2>";
+         if (intval($row["value"] == intval($row["max_value"])))
+         {
+            print "Team plus (green) won!";
+         }
+         else
+         {
+            print "Team minus (blue) won!";
+         }
+         session_destroy();
+      }
+   }
+}
+?>
+<br />
+<a href='index.php'>Leave Game</a>

example-projects/tug-of-war-in-the-clouds/web-content/config.php

@@ -0,0 +1,3 @@
+<?php
+   $pdo = new PDO('mysql:host=localhost;dbname=cloud_tug_of_war', 'cloud_tug_of_war', 'cloud');
+?>

example-projects/tug-of-war-in-the-clouds/web-content/index.php

@@ -0,0 +1,36 @@
+<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
+<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
+<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
+<h1>Welcome to "tug of war in the clouds"!</h1>
+<p>
+Choose and tug a cloud:
+</p>
+<p>
+<?php
+include 'config.php';
+
+if (isset($_POST['new_cloud_name']))
+{
+   $sql = "INSERT INTO clouds (name, value, max_value) VALUES ('" . $_POST['new_cloud_name'] . "',0," . $_POST['new_cloud_goal'] . ")";
+   $pdo->query($sql);
+}
+ 
+$sql = "SELECT * FROM clouds";
+foreach ($pdo->query($sql) as $row) {
+   if (abs(intval($row['value'])) < intval($row['max_value']))
+   {
+      echo "<a href='cloud.php?cloud_id=" . $row['cloud_id'] . "'>" . $row['name'] . "</a> (score: " . $row['value'] . ", goal:" . $row['max_value'] . ")<br />";
+   }
+}
+?>
+<!-- list -->
+</p>
+<p>
+or form a new cloud: 
+<form action="" method="post">
+Name: <input name="new_cloud_name" value="">
+Goal: <input name="new_cloud_goal" value="10">
+<input type="submit" value="Create">
+</form>
+</p>