Multiple tags to filter resource in AWS costexplorer using Go

How do you add multiple tags to filter resources using AWS golang SDK?

Hello, I have the input variable to be use for the GetCostAndUsage function from AWS SDK

input := &costexplorer.GetCostAndUsageInput{
		TimePeriod: &costexplorer.DateInterval{
			Start: aws.String(startdate.Format("2006-01-02")),
			End:   aws.String(enddate.Format("2006-01-02")),
		},
		Granularity: aws.String("MONTHLY"),
		Metrics:     []*string{aws.String("BlendedCost")},
		GroupBy: []*costexplorer.GroupDefinition{
			{
				Type: aws.String("DIMENSION"),
				Key:  aws.String("SERVICE"),
			},
		},
		Filter: &costexplorer.Expression{
			Tags: &costexplorer.TagValues{
				Key:    aws.String("project"),
				Values: []*string{aws.String("Project1")},
				MatchOptions: []*string{
					aws.String("EQUALS"),
				},
			},
		},
	}

This does works. However, I would like to filter resources using another tag which is stage with the values of dev or prod.

Thus I tried adding more tags in the Filter and it looked something like this

Filter: &costexplorer.Expression{
			Tags: &costexplorer.TagValues{
				Key:    aws.String("project"),
				Values: []*string{aws.String("Project1")},
				MatchOptions: []*string{
					aws.String("EQUALS"),
				},
			},
			Tags: &costexplorer.TagValues{
				Key:    aws.String("stage"),
				Values: []*string{aws.String("dev")},
				MatchOptions: []*string{
					aws.String("EQUALS"),
				},
			},
		},

Of course Go doesn't like that and gives duplicate field name tags on struct literal. Can you give me an idea on how should I approach this problem?

Use the And expression:

Filter: &costexplorer.Expression{
	And: []*costexplorer.Expression{
		{
			Tags: &costexplorer.TagValues{
				Key:    aws.String("project"),
				Values: []*string{aws.String("Project1")},
				MatchOptions: []*string{
					aws.String("EQUALS"),
				},
			},
		},
		{
			Tags: &costexplorer.TagValues{
				Key:    aws.String("stage"),
				Values: []*string{aws.String("dev")},
				MatchOptions: []*string{
					aws.String("EQUALS"),
				},
			},
		},
	},
},

Reference: https://pkg.go.dev/github.com/aws/aws-sdk-go/service/costexplorer#Expression

as you can see, I added an And field to the Expression struct, which allows you to specify multiple conditions that must all be true for the filter to match. I then added two separate Expression structs to the And field, each with its own Tags field representing the project and stage tags, respectively.

Note that I also added a slice of tag values to the Values field of the stage tag, to specify both the dev and prod values.

input := &costexplorer.GetCostAndUsageInput{
    TimePeriod: &costexplorer.DateInterval{
        Start: aws.String(startdate.Format("2006-01-02")),
        End:   aws.String(enddate.Format("2006-01-02")),
    },
    Granularity: aws.String("MONTHLY"),
    Metrics:     []*string{aws.String("BlendedCost")},
    GroupBy: []*costexplorer.GroupDefinition{
        {
            Type: aws.String("DIMENSION"),
            Key:  aws.String("SERVICE"),
        },
    },
    Filter: &costexplorer.Expression{
        And: []*costexplorer.Expression{
            {
                Tags: &costexplorer.TagValues{
                    Key:    aws.String("project"),
                    Values: []*string{aws.String("Project1")},
                    MatchOptions: []*string{
                        aws.String("EQUALS"),
                    },
                },
            },
            {
                Tags: &costexplorer.TagValues{
                    Key:    aws.String("stage"),
                    Values: []*string{aws.String("dev"), aws.String("prod")},
                    MatchOptions: []*string{
                        aws.String("EQUALS"),
                    },
                },
            },
        },
    },
}