50 lines
2.7 KiB
Markdown
50 lines
2.7 KiB
Markdown
# Calling a private Cloud Function from On-premises
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This example shows how to invoke a private Google Cloud Function from the on-prem environment via a Private Service Connect endpoint.
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According to the [documentation](https://cloud.google.com/functions/docs/networking/network-settings#ingress_settings), only requests from VPC networks in the same project or VPC Service Controls perimeter are allowed to call a private Cloud Function. That's the reason why a Private Service Connect endpoint is needed in this architecture.
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The Terraform script in this folder will create two projects connected via VPN: one to simulate the on-prem environment and another containing the Cloud Function and the Private Service Connect endpoint.
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The "on-prem" project contains a small VM that can be used to test the accessibility to the private Cloud Function:
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```bash
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curl https://YOUR_REGION-YOUR_PROJECT_ID.cloudfunctions.net/YOUR_FUNCTION_NAME
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```
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<!-- BEGIN TFDOC -->
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## Variables
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| name | description | type | required | default |
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|---|---|:---:|:---:|:---:|
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| [project_id](variables.tf#L44) | Project id. | <code>string</code> | ✓ | |
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| [ip_ranges](variables.tf#L17) | IP ranges used for the VPCs. | <code title="object({ onprem = string hub = string })">object({…})</code> | | <code title="{ onprem = "10.0.1.0/24", hub = "10.0.2.0/24" }">{…}</code> |
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| [name](variables.tf#L29) | Name used for new resources. | <code>string</code> | | <code>"cf-via-psc"</code> |
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| [project_create](variables.tf#L35) | If non null, creates project instead of using an existing one. | <code title="object({ billing_account_id = string parent = string })">object({…})</code> | | <code>null</code> |
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| [psc_endpoint](variables.tf#L49) | IP used for the Private Service Connect endpoint, it must not overlap with the hub_ip_range. | <code>string</code> | | <code>"172.16.32.1"</code> |
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| [region](variables.tf#L55) | Region where the resources will be created. | <code>string</code> | | <code>"europe-west1"</code> |
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## Outputs
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| name | description | sensitive |
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|---|---|:---:|
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| [function_url](outputs.tf#L17) | URL of the Cloud Function. | |
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<!-- END TFDOC -->
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## Test
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```hcl
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module "test" {
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source = "./fabric/blueprints/networking/private-cloud-function-from-onprem/"
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project_create = {
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billing_account_id = "123456-ABCDEF-123456"
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parent = "folders/1234567890"
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}
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project_id = "test-project"
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}
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# tftest modules=11 resources=44
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```
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