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Added the google cloud functions guide (#9)
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‎README.md

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@@ -14,5 +14,10 @@ The repository contains reference materials for the DevOps related videos made o
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- Reference Material - [Repo](./google-cloud-run-introduction/)
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- YouTube Video - [https://youtu.be/bKBBbryKj1w](https://youtu.be/bKBBbryKj1w)
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### Google Cloud Functions Introduction
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- Reference Material - [Repo](./google-cloud-functions-introduction/)
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- YouTube Video - [https://youtu.be/I0vJDmw6P4c](https://youtu.be/I0vJDmw6P4c)
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### Shifting Policy Management left with OPA Gatekeeper
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- Reference Material - [Repo](./opa-gatekeeper)

‎google-cloud-functions-introduction/.github/workflows/cd.yaml

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name: Continuously Deploy Master Branch
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on:
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push:
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branches:
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- 'master'
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jobs:
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cd:
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name: Deploy Master Branch
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v3
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- id: auth
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name: 'Authenticate to Google Cloud'
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uses: 'google-github-actions/auth@v0'
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with:
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credentials_json: '${{ secrets.GCP_CREDS }}'
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- name: 'Set up Cloud SDK'
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uses: 'google-github-actions/setup-gcloud@v0'
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with:
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project_id: space-cloud
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- name: 'Deploy Function'
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run: 'gcloud functions deploy greeter --trigger-http --gen2 --runtime go116 --region us-east1 --entry-point=GreeterGet'

‎google-cloud-functions-introduction/.github/workflows/close-pr.yaml

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name: Destroy Preview Environment
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on:
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pull_request:
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types: [closed]
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env:
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SERVICE_NAME: greeter-${{ github.event.number }}
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jobs:
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new-func:
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name: Destroy Preview Environment
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v3
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- id: auth
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name: 'Authenticate to Google Cloud'
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uses: 'google-github-actions/auth@v0'
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with:
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credentials_json: '${{ secrets.GCP_CREDS }}'
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- name: 'Set up Cloud SDK'
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uses: 'google-github-actions/setup-gcloud@v0'
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with:
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project_id: space-cloud
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- name: 'Delete Function'
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run: |
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gcloud functions delete $SERVICE_NAME --gen2 --region us-east1
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- uses: actions/github-script@v5
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with:
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github-token: ${{secrets.GITHUB_TOKEN}}
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script: |
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github.rest.issues.createComment({
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issue_number: context.issue.number,
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owner: context.repo.owner,
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repo: context.repo.repo,
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body: `Preview URL successfully destroyed`
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})

‎google-cloud-functions-introduction/.github/workflows/new-pr.yaml

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name: Create Preview Environment
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on:
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pull_request:
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types: [opened, synchronize, reopened]
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env:
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SERVICE_NAME: greeter-${{ github.event.number }}
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jobs:
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new-func:
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name: Create Preview Environment
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v3
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- id: auth
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name: 'Authenticate to Google Cloud'
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uses: 'google-github-actions/auth@v0'
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with:
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credentials_json: '${{ secrets.GCP_CREDS }}'
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- name: 'Set up Cloud SDK'
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uses: 'google-github-actions/setup-gcloud@v0'
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with:
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project_id: space-cloud
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- name: 'Deploy Function'
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run: |
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gcloud functions deploy $SERVICE_NAME \
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--set-env-vars='PR_NO=${{ github.event.number }}' \
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--allow-unauthenticated --trigger-http --gen2 --runtime go116 --region us-east1 --entry-point=GreeterGet
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- name: 'Get PREVIEW URL'
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run: |
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echo PREVIEW_URL=$(gcloud functions describe $SERVICE_NAME --gen2 --region us-east1 --format="value(serviceConfig.uri)") >> $GITHUB_ENV
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- uses: actions/github-script@v5
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with:
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github-token: ${{secrets.GITHUB_TOKEN}}
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script: |
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github.rest.issues.createComment({
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issue_number: context.issue.number,
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owner: context.repo.owner,
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repo: context.repo.repo,
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body: `Preview URL: ${process.env.PREVIEW_URL}`
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})

‎google-cloud-functions-introduction/README.md

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# Google Cloud Run Introduction
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> Here's a link to the YouTube video explaining this setup in greater detail:
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[![Cloud Functions Introduction](./cloud-functions.png)](https://youtu.be/I0vJDmw6P4c)
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## Prerequisites
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- You'll need to have [gcloud](https://cloud.google.com/sdk/docs/installhttps://docs.docker.com/engine/install/) installed.
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- Make sure `gcloud` is configured. You can configure `gcloud` by running `gcloud init`.
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## Steps To Reproduce The Video
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### 1] Deploy Your Code On Google Cloud Function
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```bash
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gcloud functions deploy greeter --trigger-http --gen2 --runtime go116 --region us-east1 --entry-point=GreeterGet
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```
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> Answer `yes` for all the prompts.
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You can test the app by running:
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```bash
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curl https://[APP_URL]
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```
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### 2] Implement Continous Deployments With Github Actions
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1. Create a Service Account on GCP with `Admin` privileges and generate a `credential.json` file.
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2. Create a secret in your GitHub Repository with the name `GCP_CREDS` and paste the contents in the `credentials.json` file as the value.
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3. Push the contents of this directory including the `.github` folder to your git repo.
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4. Let the magic begin
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### 3] Implement Preview Environments
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Simply create a PR on the main branch and wait for the comment to appear.

‎google-cloud-functions-introduction/cloud-functions.png

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‎google-cloud-functions-introduction/go.mod

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module github.com/YourTechBud/practical-guide/google-cloud-functions-introduction
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go 1.17
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require github.com/GoogleCloudPlatform/functions-framework-go v1.6.1
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require (
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github.com/cloudevents/sdk-go/v2 v2.6.1 // indirect
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github.com/google/uuid v1.1.2 // indirect
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github.com/json-iterator/go v1.1.10 // indirect
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github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421 // indirect
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github.com/modern-go/reflect2 v0.0.0-20180701023420-4b7aa43c6742 // indirect
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go.uber.org/atomic v1.4.0 // indirect
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go.uber.org/multierr v1.1.0 // indirect
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go.uber.org/zap v1.10.0 // indirect
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)

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