Other prep work for the Bubble Tea implementation (#98)

* Ensure new VPC gets created when requested.

Append unique string to VPC name when creating, to prevent collisions.
Add nil checks on security group and subnet parameters.
New ValidateInteger function, for input validation on plainText questions type.

Co-authored-by: Gavin <gavinburris42@gmail.com>

* Pass in stack name, to avoid name mismatch from generating a UUID

The UUID generation is internal to CreateStackAndGetResources, meaning we cannot mock it. Easier to pass in a particular value and avoid the UUID generation code altogether.

Co-authored-by: Gavin <gavinburris42@gmail.com>

pkg/cfn/cfn.go

@@ -24,6 +24,7 @@ import (
 	"github.com/aws/aws-sdk-go/aws/session"
 	"github.com/aws/aws-sdk-go/service/cloudformation"
 	"github.com/aws/aws-sdk-go/service/ec2"
+	"github.com/google/uuid"
 )
 
 const DefaultStackName = "simple-ec2"
@@ -51,7 +52,8 @@ func (c Cfn) CreateStackAndGetResources(availabilityZones []*ec2.AvailabilityZon
 	stackName *string, template string) (vpcId *string, subnetIds []string, instanceId *string,
 	stackResources []*cloudformation.StackResource, err error) {
 	if stackName == nil {
-		stackName = aws.String(DefaultStackName)
+		stackIdentifier := uuid.New()
+		stackName = aws.String(fmt.Sprintf("%s%s", DefaultStackName, stackIdentifier))
 	}
 
 	zonesToUse := []*ec2.AvailabilityZone{}

pkg/cfn/cfn_test.go

@@ -92,7 +92,7 @@ func TestCreateStackAndGetResources_Success(t *testing.T) {
 		StackEvents:    mockedEvents,
 	}
 
-	vpcId, subnetIds, instanceId, _, err := testCfn.CreateStackAndGetResources(testAzs, nil, "")
+	vpcId, subnetIds, instanceId, _, err := testCfn.CreateStackAndGetResources(testAzs, aws.String(cfn.DefaultStackName), "")
 	th.Ok(t, err)
 	th.Equals(t, testVpcId, *vpcId)
 	th.Equals(t, testSubnetIds, subnetIds)
@@ -106,7 +106,7 @@ func TestCreateStackAndGetResources_DescribeStackEventsPagesError(t *testing.T)
 		DescribeStackEventsPagesError: errors.New("Test error"),
 	}
 
-	_, _, _, _, err := testCfn.CreateStackAndGetResources(testAzs, nil, "")
+	_, _, _, _, err := testCfn.CreateStackAndGetResources(testAzs, aws.String(cfn.DefaultStackName), "")
 	th.Nok(t, err)
 }
 
@@ -118,7 +118,7 @@ func TestCreateStackAndGetResources_DescribeStackResourcesError(t *testing.T) {
 		DescribeStackResourcesError: errors.New("Test error"),
 	}
 
-	_, _, _, _, err := testCfn.CreateStackAndGetResources(testAzs, nil, "")
+	_, _, _, _, err := testCfn.CreateStackAndGetResources(testAzs, aws.String(cfn.DefaultStackName), "")
 	th.Nok(t, err)
 }
 
@@ -133,7 +133,7 @@ func TestCreateStackAndGetResources_NoSubnet(t *testing.T) {
 		StackEvents: mockedEvents,
 	}
 
-	_, _, _, _, err := testCfn.CreateStackAndGetResources(testAzs, nil, "")
+	_, _, _, _, err := testCfn.CreateStackAndGetResources(testAzs, aws.String(cfn.DefaultStackName), "")
 	th.Nok(t, err)
 }
 
@@ -152,7 +152,7 @@ func TestCreateStackAndGetResources_NoVpc(t *testing.T) {
 		StackEvents: mockedEvents,
 	}
 
-	_, _, _, _, err := testCfn.CreateStackAndGetResources(testAzs, nil, "")
+	_, _, _, _, err := testCfn.CreateStackAndGetResources(testAzs, aws.String(cfn.DefaultStackName), "")
 	th.Nok(t, err)
 }
 

pkg/ec2helper/ec2helper.go

@@ -20,6 +20,7 @@ import (
 	"io/ioutil"
 	"os"
 	"sort"
+	"strconv"
 	"strings"
 
 	"simple-ec2/pkg/cfn"
@@ -1117,6 +1118,14 @@ func (h *EC2Helper) LaunchSpotInstance(simpleConfig *config.SimpleInfo, detailed
 		if simpleConfig.LaunchTemplateId != "" {
 			_, err = h.LaunchFleet(aws.String(simpleConfig.LaunchTemplateId))
 		} else {
+			// Create new stack, if specified.
+			if simpleConfig.NewVPC {
+				err := h.createNetworkConfiguration(simpleConfig, nil)
+				if err != nil {
+					return err
+				}
+			}
+
 			template, err := h.CreateLaunchTemplate(simpleConfig, detailedConfig)
 			if err != nil {
 				if aerr, ok := err.(awserr.Error); ok {
@@ -1171,7 +1180,9 @@ func (h *EC2Helper) createNetworkConfiguration(simpleConfig *config.SimpleInfo,
 		return errors.New("No subnet with the selected availability zone found")
 	}
 
-	input.SubnetId = selectedSubnetId
+	if input != nil {
+		input.SubnetId = selectedSubnetId
+	}
 
 	/*
 		Get the security group.
@@ -1208,7 +1219,9 @@ func (h *EC2Helper) createNetworkConfiguration(simpleConfig *config.SimpleInfo,
 		return errors.New("No security group available for stack")
 	}
 
-	input.SecurityGroupIds = aws.StringSlice(selectedSecurityGroupIds)
+	if input != nil {
+		input.SecurityGroupIds = aws.StringSlice(selectedSecurityGroupIds)
+	}
 
 	// Update simpleConfig for config saving
 	simpleConfig.NewVPC = false
@@ -1284,6 +1297,15 @@ func ValidateTags(h *EC2Helper, userTags string) bool {
 	return true
 }
 
+// ValidateInteger checks if a given string is an integer
+func ValidateInteger(h *EC2Helper, intString string) bool {
+	_, err := strconv.Atoi(intString)
+	if err != nil {
+		return false
+	}
+	return true
+}
+
 // Given an AWS platform string, tell if it's a Linux platform
 func IsLinux(platform string) bool {
 	return platform == ec2.CapacityReservationInstancePlatformLinuxUnix ||

pkg/ec2helper/ec2helper_test.go

@@ -1390,6 +1390,26 @@ func TestValidateTags_False(t *testing.T) {
 	th.Equals(t, false, result)
 }
 
+func TestValidateInteger_True(t *testing.T) {
+	testUserInput := "123"
+	result := ec2helper.ValidateInteger(testEC2, testUserInput)
+	th.Equals(t, true, result)
+}
+
+func TestValidateInteger_False(t *testing.T) {
+	floatInput := "123.456"
+	floatResult := ec2helper.ValidateInteger(testEC2, floatInput)
+	th.Equals(t, false, floatResult)
+
+	stringInput := "abcdefg"
+	stringResult := ec2helper.ValidateInteger(testEC2, stringInput)
+	th.Equals(t, false, stringResult)
+
+	alphanumericInput := "123abc"
+	alphanumericResult := ec2helper.ValidateInteger(testEC2, alphanumericInput)
+	th.Equals(t, false, alphanumericResult)
+}
+
 func TestIsLinux_True(t *testing.T) {
 	actualIsLinux := ec2helper.IsLinux(ec2.CapacityReservationInstancePlatformLinuxUnix)
 	th.Equals(t, true, actualIsLinux)