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Merge pull request #3 from terraform-google-modules/feature/automatic…
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…-project-deletion-example

Add submodule that automatically cleans up old projects
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aaron-lane authored Jun 11, 2019
2 parents 2e92981 + 871d79c commit ba5a47b
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4 changes: 4 additions & 0 deletions .gitignore
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*.iml
.idea

examples/**/*.zip
examples/**/terraform.tfvars
modules/**/terraform.tfvars
submodules/**/terraform.tfvars
37 changes: 37 additions & 0 deletions modules/project_cleanup/README.md
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# Old Project Cleanup Utility Module

This module schedules a job to clean up GCP projects older than a specified length of time, that match a particular key-value pair. This job runs every 5 minutes via Google Cloud Scheduled Functions. Please see the [utility's readme](./function_source/README.md) for more information as to its operation and configuration.

## Requirements

### App Engine

Running this module requires an App Engine app in the specified project/region. More information is in the [root readme](../../README.md#app-engine).

### Enabled Services

The following services must be enabled on the project housing the cleanup function prior to invoking this module:

- Cloud Functions (`cloudfunctions.googleapis.com`)
- Cloud Scheduler (`cloudscheduler.googleapis.com`)
- Cloud Resource Manager (`cloudresourcemanager.googleapis.com`)

[^]: (autogen_docs_start)


## Inputs

| Name | Description | Type | Default | Required |
|------|-------------|:----:|:-----:|:-----:|
| organization_id | The organization ID whose projects to clean up | string | - | yes |
| project_id | The project ID to host the scheduled function in | string | - | yes |
| region | The region the project is in (App Engine specific) | string | `us-central1` | no |

## Outputs

| Name | Description |
|------|-------------|
| name | The name of the job created |
| project_id | The project ID |

[^]: (autogen_docs_end)
22 changes: 22 additions & 0 deletions modules/project_cleanup/function_source/README.md
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# Project Cleanup Utility

This is a simple utility that scans a GCP organization for projects matching certain criteria, and enqueues such projects for deletion. Currently supported criteria are the combination of:

- **Age:** Only projects older than the configured age, in hours, will be marked for deletion.
- **Key-Value Pair:** Only projects whose labels contain the provided key-value pair will be marked for deletion.

Both of these criteria must be met for a project to be deleted.

## Environment Configuration

The following environment variables may be specified to configure the cleanup utility:

| Name | Description | Type | Default | Required |
|------|-------------|:----:|:-----:|:-----:|
| `TARGET_TAG_NAME` | The tag name to match on for identifying projects to delete | string | n/a | yes |
| `TARGET_TAG_VALUE` | The tag value to match on for identifying projects to delete | string | n/a | yes |
| `MAX_PROJECT_AGE_HOURS` | The project age, in hours, at which point deletion should be considered | integer | n/a | yes |

## Required Permissions

This Cloud Function must be run as a Service Account with the `Organization Administrator` role.
9 changes: 9 additions & 0 deletions modules/project_cleanup/function_source/go.mod
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module github.com/terraform-google-modules/project-cleaner

go 1.11

require (
golang.org/x/net v0.0.0-20190318221613-d196dffd7c2b
golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421
google.golang.org/api v0.1.0
)
115 changes: 115 additions & 0 deletions modules/project_cleanup/function_source/go.sum
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gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20180920025451-e3ad64cb4ed3/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
115 changes: 115 additions & 0 deletions modules/project_cleanup/function_source/main.go
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/*
Copyright 2019 Google LLC
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
https://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package project_cleaner

import (
"fmt"
"log"
"os"
"strconv"
"time"

"golang.org/x/net/context"
"golang.org/x/oauth2/google"
"google.golang.org/api/cloudresourcemanager/v1"
)

var (
logger = log.New(os.Stdout, "", 0)
)

// PubSubMessage wraps the message sent to the background Cloud Function by GCP PubSub.
type PubSubMessage struct {
Data []byte `json:"data"`
}

// CleanUpProjects is the entry point of the scheduled function.
func CleanUpProjects(ctx context.Context, m PubSubMessage) error {
targetTag := os.Getenv("TARGET_TAG_NAME")
targetValue := os.Getenv("TARGET_TAG_VALUE")
maxAgeInHoursStr := os.Getenv("MAX_PROJECT_AGE_HOURS")
maxAgeInHours, err := strconv.ParseInt(maxAgeInHoursStr, 10, 0)
if err != nil {
logger.Fatal(fmt.Sprintf("Could not convert %s to integer", maxAgeInHoursStr))
return err
}
logger.Println(fmt.Sprintf("Launching project cleanup for projects older than %d hours, with tag %s=%s", maxAgeInHours, targetTag, targetValue))
err = deleteProjectsMatchingTag(ctx, targetTag, targetValue, maxAgeInHours)
if err != nil {
logger.Fatal(err)
}
return err
}

func deleteProjectsMatchingTag(ctx context.Context, key string, value string, acceptableAgeInHours int64) error {
logger.Println("Initializing Google client")
c, err := google.DefaultClient(ctx, cloudresourcemanager.CloudPlatformScope)
if err != nil {
return err
}

cloudResourceManagerService, err := cloudresourcemanager.New(c)
if err != nil {
return err
}

resourceCreationCutoff := tooOldTime(int64(acceptableAgeInHours * 60 * 60))

logger.Println("Looking through projects")
req := cloudResourceManagerService.Projects.List()
if err := req.Pages(ctx, func(page *cloudresourcemanager.ListProjectsResponse) error {
for _, project := range page.Projects {
if val, ok := project.Labels[key]; !(ok && val == value) {
logger.Println(fmt.Sprintf("Rejecting project %s because of missing label", project.ProjectId))
continue
}

if project.LifecycleState != "ACTIVE" {
logger.Println(fmt.Sprintf("Rejecting project %s because lifecycle state is not ACTIVE", project.ProjectId))
continue
}

projectCreatedAt, err := time.Parse(time.RFC3339, project.CreateTime)
if err != nil {
return err
}

if !projectCreatedAt.Before(resourceCreationCutoff) {
logger.Println(fmt.Sprintf("Rejecting project %s because it was created too recently", project.ProjectId))
continue
}

logger.Println(fmt.Sprintf("Project %s was created at %s, is active, and is older than %d hours. Deleting.", project.ProjectId, project.CreateTime, acceptableAgeInHours))

_, err = cloudResourceManagerService.Projects.Delete(project.ProjectId).Do()
if err != nil {
logger.Fatal(err)
return err
}
logger.Println(fmt.Sprintf("Requested deletion of project %s.", project.ProjectId))
}
return nil
}); err != nil {
return err
}
logger.Println("Considered all projects")
return nil
}

func tooOldTime(i int64) time.Time {
return time.Unix(time.Now().Unix()-i, 0)
}
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